CN103224772A - Well cementation cement slurry, preparation method and application thereof - Google Patents
Well cementation cement slurry, preparation method and application thereof Download PDFInfo
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- CN103224772A CN103224772A CN2013101196005A CN201310119600A CN103224772A CN 103224772 A CN103224772 A CN 103224772A CN 2013101196005 A CN2013101196005 A CN 2013101196005A CN 201310119600 A CN201310119600 A CN 201310119600A CN 103224772 A CN103224772 A CN 103224772A
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- 239000004568 cement Substances 0.000 title claims abstract description 182
- 239000002002 slurry Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 50
- 239000002245 particle Substances 0.000 claims abstract description 43
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 34
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004005 microsphere Substances 0.000 claims abstract description 7
- 230000008719 thickening Effects 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000004571 lime Substances 0.000 claims abstract description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 26
- 239000003921 oil Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 14
- 230000000996 additive effect Effects 0.000 claims description 13
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 9
- 229920001732 Lignosulfonate Polymers 0.000 claims description 8
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 8
- 229920006318 anionic polymer Polymers 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 229920002253 Tannate Polymers 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 16
- 239000009096 changqing Substances 0.000 description 8
- 239000011325 microbead Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000003981 vehicle Substances 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to well cementation cement slurry, a preparation method and application thereof, wherein the cement slurry comprises the following components in parts by weight: 65-75 parts of cement, 20-30 parts of a lightening admixture, 3-6 parts of a reinforcing agent, 0.3-1 part of a fluid loss agent, 2-4 parts of an early strength admixture, 0.6-1.0 part of a retarder and 60-80 parts of water, wherein the lightening admixture is hollow microspheres, the main components of the lightening admixture are silicon dioxide, aluminum oxide, lime, magnesium oxide and ferric oxide, the particle size of the particles is 56-360 mu m, and the density of the particles is 0.80g/cm3(ii) a The specific surface area of the reinforcing agent powder is 15-20m2(iv)/g, particle size range 0.1-200 μm, and particle size distribution 0.1 μm: 15%, 0.1-0.5 μm: 45-50 percent; 0.5-1.0 μm: 10 to 20 percent; 1.0-3.0 μm: 5 to 10 percent; 3.0-10.0 μm: 5 percent; 10.0-200 μm: 7 to 12 percent. The cement slurry can realize that the cement returns to the high position, and improve the well cementation quality of the low-pressure easy-to-leak well section. The cement paste has small initial consistency, is beneficial to field mixing and reduction of flow resistance, and has stable high-temperature performance and adjustable thickening time.
Description
Technical Field
The invention relates to well cementation cement slurry, a preparation method and application thereof.
Background
At present, reserves of 35 hundred million tons are not used in China, 70 percent of reserves are low-pressure oil reservoirs, leakage is very easy to occur in drilling, the specific gravity of mud is below 1.0 in the underbalanced drilling process, and the specific gravity of cement paste is required to be 0.95-1.10 g/cm3Some low-permeability (0.025-15.6 md), low-porosity, low-abundance and low-productivity oil and gas reservoirs have multi-pressure layer systems, so that in order to improve the success rate of exploration, prevent leakage and formation pollution, reduce cost and realize one-time sealing, the ultra-low-density cement paste is required to be used for effective sealing. The low-pressure stratum is difficult to well cementation in the low-pressure stratum which is easy to leak due to small bearing capacity and high density of well cementation cement paste, the cement cannot return to a preset position, the well cementation quality is influenced, and the service life of a well is seriously influenced. In order to meet the well cementation requirement, a reasonable well cementation pressure difference, a proper well cementation cement slurry density and a reasonable construction process become keys.
In the early 60 s of the last century, low density grouts of cement in bentonite, diatomaceous earth, expanded pearl salt, water glass, siliceous fillers, etc. have been used with wide success in the middle east, the Soviet Union, the gulf of Mexico, etc., and the lowest density limit of grouts of suitable strength prepared with such materials was 1.318g/cm3. In the late nineties of the last century, the schrenbach company applies the close packing theory to the design of well cementing cement slurry and develops a new generation of low-density high-strength cement slurry. 1.2g/cm prepared by the method in Haributon USA3The compressive strength of the cement slurry can reach 14MPa, the permeability is low, and the cement slurry has more application reports in complex stratum well cementation such as low pressure and easy leakage. Low density, high strength used in 1998The technology is used for cementing 257 mouths in northern Africa, North sea and other areas. The oil and gas basin in China has a low-pressure layer, stratum leakage has great influence, and irreparable loss is brought to the later stage. Therefore, the research on the low-pressure and easy-to-leak stratum well cementation technology becomes a precondition and an important guarantee for efficient, economic and safe exploitation of oil and gas resources.
Due to the doping of a large amount of external doping materials, the density of the cement paste is reduced, the stability of a cement paste system is poor, and the system is separated in layers; the water loss of cement paste is difficult to control; the cement paste has poor rheological property and difficult pumping; the cement paste stone has slow development of strength, low strength and high permeability, and is easy to cause corrosion of corrosive media.
The ultra-low density lightening material which can be provided at home at present can not meet the slurry preparation requirement of ultra-low density cement slurry in the aspects of strength, activity, slurry preparation performance and the like; the adoption of the foamed cement slurry to realize the ultralow-density cement slurry can be realized, but the conventional foamed cement slurry has the defects that the difference between the actual density and the ground density is larger due to the influence of the underground temperature and pressure, the strength at the low temperature is lower, the adaptability of a foamed additive and other additives is poorer, the comprehensive performance requirement of the cement slurry cannot be met, and the like, and the single ultralow-density foamed cement slurry is difficult to meet the requirements of high strength, low permeability and underground cement slurry density, so that a low-density high-strength cement slurry system is researched on the basis of the prior art.
Disclosure of Invention
One object of the invention is to provide a well cementation cement slurry, which has small initial consistency, is beneficial to on-site mixing and reduction of flow resistance, and has stable high-temperature performance and adjustable thickening time.
Another object of the present invention is to provide the use of said cement slurry in cementing wells.
The invention also aims to provide a preparation method of the cement paste.
In order to achieve the above purpose, in one aspect, the invention provides a well cementation cement slurry, which comprises the following components in parts by weight:
a. 65-75 parts of cement, namely cement,
b. 20-30 parts of a lightening agent,
c. 3-6 parts of a reinforcing agent,
d. 0.3 to 1 part of fluid loss agent,
e. 2-4 parts of an early strength agent,
f. 0.6 to 1.0 portion of retarder,
g. 60-80 parts of water.
In the cement slurry according to the embodiment of the present invention, it is preferable that the light-reducing agent is a cenosphere.
According to the cement slurry of the embodiment of the invention, the hollow microspheres preferably contain the following components in percentage by weight: 58% SiO2，35%Al2O3，3.4%Fe2O3，2.0%CaO，1.6%MgO。
The hollow microsphere component is a ferrite compound, and is prepared by mixing raw materials of the ferrite compound of silicon dioxide, aluminum oxide, lime, magnesium oxide and ferric oxide, sending the mixture into an air inlet of a spray dryer with the temperature of 180 ℃ plus one material at 200 ℃, collecting the mixture into a collector after the mixture passes through the outlet with the temperature of 120 ℃ plus one material at 150 ℃, collecting powder, then sending the powder into an energy-saving furnace with the temperature of 400 ℃ plus one material at 600 ℃, and dropping the powder into a recoverer with the temperature of 115 ℃ plus one material at 150 ℃.
The conventional low-density cement paste system takes G-grade cement and floating beads as basic materials, and the shell of the hollow microsphere mainly consists of silica-alumina glass, and can be mixed with a cement hydration product Ca (OH)2And CaSO in minerals4The cement paste acts to generate a product with gelling property, thereby being beneficial to the development of the strength of the cement paste and the reduction of the permeability.
According to the cement paste provided by the specific embodiment of the invention, the hollow microspheres are preferably selected, the particle size of the particles is 56-360 mu m, and the density is 0.80g/cm3。
According to the cement slurry of the embodiment of the invention, the reinforcing agent is preferably a micro-fine cementing material which comprises the following components in percentage by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5。
The compact packing theory adopts materials with different grain diameters, realizes the full filling of the low-density cement stone gaps, and can improve the stability of cement paste. Can enhance the compactness and the compressive strength of the set cement.
Factors that influence the interaction between cement slurry particles are particle concentration, particle size distribution and reactivity of the different cement phases. The particle concentration will determine the distance between the particles and the internal binding probability, as well as the formation of a gel structure; the particle size distribution, particularly the high surface area colloidal fraction, will play a determining role in rheology and stability.
In the cement paste according to the embodiment of the present invention, it is preferable that the specific surface area of the reinforcing agent powder is 15 to 20m2(iii) per gram, particle size of 0.1-200 μm.
In the cement slurry according to the embodiment of the present invention, the reinforcing agent is preferably selected from the group consisting of reinforcing agents, and reinforcing agents, wherein the particle size distribution is 0.1 μm: 15%, 0.1-0.5 μm: 45-50 percent; 0.5-1.0 μm: 10 to 20 percent; 1.0-3.0 μm: 5 to 10 percent; 3.0-10.0 μm: 5 percent; 10.0-200 μm: 7 to 12 percent.
The reinforcing agent of the invention scientifically utilizes the particle grading principle through reinforcing admixture of different particles and cement with specific surface area larger than G grade, embeds small particles in gaps formed by large particles, and enhances the compactness and structural strength of cement stones. The early strength agent can promote the rapid hydration of cement paste at low temperature and improve the early strength of the set cement. The cement paste can generate thixotropy, so that fluid is prevented from invading the cement paste, the cement paste has good effect of preventing formation fluid from entering an annular space during the waiting setting period, and the cement-stone interface bonding strength is improved; can improve the compactness and structural strength of the set cement.
In the cement slurry according to the embodiment of the present invention, the fluid loss additive is preferably a mixture of sulfonated polystyrene and sulfonated polymethylstyrene.
More preferably, the weight ratio of the sulfonated polystyrene to the sulfonated polymethylstyrene is 1: 2.
in the cement paste according to the embodiment of the present invention, the retarder is preferably one or a mixture of two or more of sodium tannate, iron-chromium lignosulfonate and carboxymethyl hydroxyethyl cellulose.
In the cement slurry according to the embodiment of the present invention, it is preferable that the early strength agent is mainly composed of calcium chloride or an anionic polymer.
The anionic polymer is preferably a triethanolamine-type anionic polymer;
for example, the high-efficiency early strength agent GLC can be produced by the science and technology limited of Changqing, West Ann.
The high-efficiency early strength agent can promote the rapid hydration of cement paste at low temperature and improve the early strength of cement paste; the cement paste can generate thixotropy, so that fluid is prevented from entering the cement paste, the cement paste has a good effect of preventing formation fluid from entering an annular space during the waiting setting period, and the cement-stone interface bonding strength is improved; in addition, the high-efficiency early strength agent is combined with the admixture, so that the compactness and the structural strength of the set cement can be improved.
In the cement paste according to the embodiment of the invention, the cement-water-cement ratio is preferably 0.5-0.6, and the density of the cement paste is 1.25-1.45g/cm3The cement slurry thickening time is between 130 and 220 minutes, and the cement stone permeability is less than 0.1 multiplied by 10-3μm2The 50 ℃/48h compressive strength is more than 14MPa, and the maximum compressive strength is 19 MPa.
On the other hand, the invention also provides the application of the cement slurry in oil reservoir cementing.
Preferably, the oil layer is a low pressure, easily leaking oil layer, for use according to embodiments of the present invention.
Among them, an oil layer having a pressure coefficient of 0.7 and a loss pressure of 3.5MPa is preferable.
In another aspect, the invention further provides a preparation method of the cement paste, wherein the preparation method comprises the following steps:
(1) calculating the weight of cement and water, and respectively weighing the water and the cement;
(2) weighing the lightening admixture, stirring and putting into the water in the step (1);
(3) weighing the reinforcing agent, stirring and putting into the solution in the step (2);
(4) weighing the fluid loss agent, stirring and putting into the solution in the step (3);
(5) weighing the early strength agent, and putting the early strength agent into the solution in the step (4) under stirring;
(6) weighing a retarder, stirring and putting into the solution in the step (5);
(7) adding the cement weighed in the step (1) into the solution in the step (6), and stirring;
(8) and (4) pouring the cement paste obtained after stirring in the step (7) into a slurry cup, and stirring for 20 minutes at room temperature to obtain the cement paste.
In accordance with the method of the present embodiment, the cement is a commercially available cement, typically a dry cement, conventionally used in the art.
According to the method of the present embodiment, the stirring in the steps (2) to (6) is preferably 4000 r/min.
According to the method of the present embodiment, the addition in the step (7) is preferably carried out for 60 seconds.
According to the method of the embodiment of the present invention, in the step (7), the stirring is performed at 12000r/min for 35 seconds.
The invention provides a cement paste system for enhancing strength and compactness and a preparation method thereof, aiming at the problem that the strength of low-density cement paste in the prior art is slow to develop. The superfine reinforcing admixture is added into the low-density cement paste, so that the cement paste has excellent suspension stability, and the compressive strength and compactness of the low-density cement stone are greatly improved. The hollow micro-beads have the characteristics of light weight, tightness, fine particles, certain activity and the like, so that the density of cement paste is reduced; the early strength agent can enable cement paste to generate thixotropy, prevent fluid from invading the cement paste, enable the cement paste to have good effect of preventing formation fluid from entering an annular space during the waiting setting period, and improve the cementing strength of a cement-stone interface; thereby realizing that the cement returns high to the place and improving the well cementation quality of the low-pressure easy-to-leak well section.
In conclusion, the invention provides well cementation cement slurry, a preparation method and application thereof. Compared with the prior art, the invention has the following advantages:
1. the density of the low-density high-strength cement slurry for cementing a low-pressure easily-leaked multi-oil reservoir section can be reduced to 1.25g/cm3The cement is returned to the high position, and the well cementation quality of the low-pressure easy-to-leak well section is improved.
2. The compactness and the compressive strength of the set cement are high, and the permeability of the set cement is less than 0.1 multiplied by 10-3μm2The 50 ℃/48h compressive strength is more than 13MPa, and the maximum compressive strength is 18 MPa. The requirement of fracturing reformation is met.
3. The initial consistency is small, which is beneficial to on-site mixing and reducing flow resistance, and the high temperature performance is stable, and the thickening time is adjustable.
4. The system has low temperature, high strength, fast strength development, good low density slurry preparation stability, excellent suspension stability and upper and lower density difference less than 0.02g/cm3。
5. The cement paste material comes from the market mostly, and is low in cost and convenient to maintain and operate on site.
The benefits of the invention are also shown in the following aspects:
(1) if the cement is not well sealed, secondary cementing operation is required, and the required cost is as follows:
A. 5-6 days are needed for extruding cement once, and five days are needed for extruding cement; the daily expense of the drilling team can be saved by 25 ten thousand yuan per day by calculating according to the daily expense of the drilling team by 5 ten thousand yuan per day.
B. The average well depth is calculated according to 2400 meters, 258 drill rods produced by 31/2 are used in one well, the lease fee per day is 20 yuan per one well, and the lease fee per small drill rod of each well is 25800 yuan.
C. 1 water supply vehicle for reverse cement squeezing, 2 cement vehicles, 1 ash tank vehicle, 10 tons of cement, and about 8 ten thousand yuan of cost for average cement squeezing twice.
D. The electric measurement cost is calculated according to 1 ten thousand yuan.
E. And (3) perforation cost: calculated as 3 ten thousand dollars.
F. The cost of pressure test is calculated according to 0.4 ten thousand yuan.
Total savings: 25+2.58+8+1+3+0.4=39.98 ten thousand yuan
(2) The low-density high-strength leak-proof cement slurry system has low density and high strength, the cement height reaches the design requirement, the casing is protected, the corrosion is reduced, the service life of an oil well is prolonged, and the economic benefit is immeasurable.
Detailed Description
The following detailed description is provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present disclosure.
The product of the examples of the invention was prepared as follows (exemplified by the formulation of example 3):
the preparation method of the low-density high-strength cement slurry for low-pressure easy-leakage multi-oil reservoir section well cementation comprises the following steps:
1. calculating the weight of cement and water according to the required water-cement ratio (the water-cement ratio is 0.5);
2. weighing 70 parts of cement on a platform scale or a balance, measuring 35 parts of corresponding water by using a measuring cylinder, starting a stirrer, and adjusting the revolution number to 4000 r/min;
3. weighing 25 parts of the lightening admixture by using a standard balance, putting the lightening admixture into the water obtained in the step 2, and adjusting the revolution number to 4000 r/min;
4. 4 parts of reinforcing agent is weighed by a standard balance and is put into the water obtained in the step 3, and the revolution is adjusted to 4000 r/min;
5. weighing 0.5 part of fluid loss agent by using a standard balance, putting into the water obtained in the step (4), and adjusting the revolution number to 4000 r/min;
6. 3 parts of early strength agent is weighed by a standard balance and put into the water obtained in the step 5, and the revolution is adjusted to 4000 r/min;
7. 0.8 part of retarder is weighed by a standard balance and put into the water obtained in the step 6, and the revolution is adjusted to 4000 r/min;
8. pour the aqueous solution into the cup of the mixer and add the weighed out dry cement to the water over a period of 60 seconds. Then, the rotation speed of the stirrer was adjusted to 12000r/min, and stirring was continued for 35 seconds while keeping a timer.
9. And pouring the stirred cement slurry into a slurry cup, stirring at room temperature for 20 minutes, and taking out.
Example 1:
the density was 1.44g/cm3The low-pressure easily-leaked low-density high-strength cement slurry for cementing a multi-oil reservoir section comprises the following components in percentage by weight:
the low-density high-strength cement slurry for low-pressure easy-leakage multi-oil-reservoir section well cementation is prepared from the following components in parts by weight:
75 parts of cement, wherein the cement is Jiahua G-grade cement;
30 parts of lightening admixture, and the lightening admixture produced by the science and technology limited of the Changqing of Xian is hollow micro-beads of 58 percent SiO2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
6 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 48 percent; 0.5 to 1.0 μm: 15 percent; 1.0 to 3.0 μm: 10 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm: 7 percent;
1 part of fluid loss agent, wherein the fluid loss agent is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to a weight ratio of 1: 2 ratio of the mixture;
4 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
1.0 part of retarder, wherein the retarder adopts iron-chromium lignosulfonate;
80 parts of water, and stirring according to a preparation method.
Example 2:
the density was 1.25g/cm3The low-pressure easily-leaked low-density high-strength cement slurry for cementing a multi-oil reservoir section comprises the following components in percentage by weight:
65 parts of cement, wherein the cement is Jiahua G-grade cement;
20 portions of lightening agent which is hollow micro-bead 58% SiO2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
3 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 48 percent; 0.5 to 1.0 μm: 20 percent; 1.0 to 3.0 μm: 10 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm: 7 percent;
0.3 part of fluid loss additive, wherein the fluid loss additive is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to a weight ratio of 1: 2 ratio of the mixture;
2 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
0.6 part of retarder, wherein the retarder adopts iron-chromium lignosulfonate;
60 parts of water, and stirring according to a preparation method.
Example 3:
the density was 1.28g/cm3The low-pressure easy-to-leak low-density high-strength cement slurry for cementing a multi-oil layer section.
70 parts of cement, wherein the cement is Jiahua G-grade cement;
25 portions of lightening agent which is 58 percent SiO of hollow micro-beads2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
4 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 45 percent; 0.5 to 1.0 μm: 10 percent; 1.0 to 3.0 μm: 5 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm：10%。
0.5 part of fluid loss additive, wherein the fluid loss additive is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to the weight ratio of 1: 2 ratio of the mixture;
3 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
0.8 part of retarder, wherein the retarder adopts iron-chromium lignosulfonate;
65 parts of water, and stirring according to a preparation method.
Example 4:
the density was 1.30g/cm3The low-pressure easily-leaked low-density high-strength cement slurry for cementing a multi-oil reservoir section comprises the following components in percentage by weight:
68 parts of cement, wherein the cement is Jiahua G-grade cement;
24 portions of lightening agent which is hollow micro-bead 58% SiO2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
5 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 48 percent; 0.5 to 1.0 μm: 16 percent; 1.0 to 3.0 μm: 7 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm: 9 percent;
0.6 part of fluid loss additive, wherein the fluid loss additive is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to a weight ratio of 1: 2 ratio of the mixture;
2 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
0.6 part of retarder, wherein the retarder adopts iron-chromium lignosulfonate and carboxymethyl hydroxyethyl cellulose;
70 parts of water, and stirring according to a preparation method.
Example 5:
the density was 1.34g/cm3The low-pressure easily-leaked low-density high-strength cement slurry for cementing a multi-oil reservoir section comprises the following components in percentage by weight:
65 parts of cement, wherein the cement is Jiahua G-grade cement;
28 parts of lightening agent, wherein the lightening agent is hollow micro-bead 58% SiO2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
3 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 47%; 0.5 to 1.0 μm: 18 percent; 1.0 to 3.0 μm: 6 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm: 9 percent;
0.8 part of fluid loss additive, wherein the fluid loss additive is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to a weight ratio of 1: 2 ratio of the mixture;
4 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
0.7 part of retarder, wherein the retarder adopts 0.3 part of iron-chromium lignosulfonate and 0.4 part of carboxymethyl hydroxyethyl cellulose;
75 parts of water, and stirring according to a preparation method.
Example 6:
the density was 1.34g/cm3The low-pressure easily-leaked low-density high-strength cement slurry for cementing a multi-oil reservoir section comprises the following components in percentage by weight:
65 parts of cement, wherein the cement is Jiahua G-grade cement;
28 parts of lightening agent, wherein the lightening agent is hollow micro-bead 58% SiO2，35%Al2O3，3.4%Fe2O32.0% CaO, 1.6% MgO; the particle diameter of the particles is 56-360 mu m, and the density is 0.80g/cm3；
3 parts of reinforcing agent, wherein the reinforcing agent is a micro cementing material produced by the science and technology limited of the Changqing of Xian, 100 parts by weight of the reinforcing agent comprise the following chemical components in parts by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5(ii) a Particle size distribution 0.1 μm: 15%, 0.1 to 0.5 μm: 48 percent; 0.5 to 1.0 μm: 16 percent; 1.0 to 3.0 μm: 7 percent; 3.0 to 10.0 μm: 5 percent; 10.0 to 200 μm: 9 percent;
0.8 part of fluid loss additive, wherein the fluid loss additive is prepared from sulfonated polystyrene and sulfonated polymethylstyrene according to a weight ratio of 1: 2 ratio of the mixture;
4 parts of an early strength agent, wherein the early strength agent is high-efficiency early strength agent GLC produced by the science and technology limited of Changqing, Xian;
0.7 part of retarder, wherein the retarder adopts 0.3 part of sodium tannate, 0.2 part of iron-chromium lignosulfonate and 0.2 part of carboxymethyl hydroxyethyl cellulose;
75 parts of water, and stirring according to a preparation method.
The properties of the products of the examples of the invention are given below in tabular form:
the above examples 1-6 reach the strength requirement, the set cement strength is greater than 10MPa, and the concrete parameters of the cement slurry of each example are as follows in Table 1:
TABLE 1
Table 2 gives a table of the low density high strength cement thickening time performance data, as can be seen from the following example data: the determined cement slurry formula and the change of the addition amount of the admixture have good compatibility, the cement slurry thickening time is over 110 minutes, the water cement ratio is controlled to be 0.5-0.6, and the cement slurry density is 1.25-1.45/cm3And in addition, the system is stable, does not settle and has good flowing property. The free liquid is less, and the requirements of construction performance parameters of a well cementation site can be met.
TABLE 2
Table 3 gives a table of the compressive strength properties of the low density, high strength cement slurry. The superfine reinforcing admixture has small specific surface area, is embedded in the gaps formed by large particles, and the hollow microspheres and cement hydration products generate gel characteristic products, so that the strength of the cement is developed, the cement paste can be well and compactly cemented in the coagulation process, and the compressive strength is improved.
TABLE 3
Test data show that when the water cement ratio is 0.5-0.6, the cement paste density is 1.25-1.45g/cm3The compression strength of the set cement reaches more than 14 MPa. Compared with other low-density cements, the low-density high-strength set cement is compact in cementation, compact in embedding among particles, small in pores, high in strength and poor in permeability. The strength test data also show that the compressive strength of the composite material can completely and effectively seal the casing and the formation water, and the requirements of fracturing, acidizing and reconstruction are met.
Table 4 shows a performance data table of the water loss rate of the low-density high-strength cement, API water loss under the same water-solid ratio is measured for 4 cement paste formulations, and the test data is shown in table 4, wherein the API water loss reaches below 30ml, and the requirement of the target layer well cementation on the water loss rate can be met.
TABLE 4
Claims (10)
1. The well cementation cement slurry is characterized by comprising the following components in parts by weight:
a. 65-75 parts of cement, namely cement,
b. 20-30 parts of a lightening agent,
c. 3-6 parts of a reinforcing agent,
d. 0.3 to 1 part of fluid loss agent,
e. 2-4 parts of an early strength agent,
f. 0.6 to 1.0 portion of retarder,
g. 60-80 parts of water;
wherein,the light-reducing agent is hollow microspheres, the main components of the light-reducing agent are silicon dioxide, aluminum oxide, lime, magnesium oxide and ferric oxide, the particle size of the particles is 56-360 mu m, and the density is 0.80g/cm3；
The specific surface area of the reinforcing agent powder is 15-20m2(ii)/g, particle size range 0.1-200 μm, and particle size distribution 0.1 μm: 15%, 0.1-0.5 μm: 45-50 percent; 0.5-1.0 μm: 10 to 20 percent; 1.0-3.0 μm: 5 to 10 percent; 3.0-10.0 μm: 5 percent; 10.0-200 μm: 7 to 12 percent.
2. The cement slurry according to claim 1, wherein the cenospheres comprise the following components in percentage by weight: 58% SiO2，35%Al2O3，3.4%Fe2O3，2.0%CaO，1.6%MgO。
3. The cement slurry according to claim 1, wherein the reinforcing agent comprises the following components in percentage by weight: 92% SiO2，2.7%Al2O3，0.80%Fe2O3，2.54%CaO，0.36%MgO，1.6%P2O5。
4. The cement slurry of claim 1, wherein the fluid loss additive is a mixture of sulfonated polystyrene and sulfonated polymethylstyrene; preferably, the weight ratio of the sulfonated polystyrene to the sulfonated polymethylstyrene is 1: 2.
5. the cement slurry of claim 1, wherein the retarder is one or a mixture of more than two of sodium tannate, iron-chromium lignosulfonate and carboxymethyl hydroxyethyl cellulose.
6. The cement slurry according to claim 1, wherein the early strength agent comprises calcium chloride or an anionic polymer as a main component; preferably, the anionic polymer is an anionic polymer of the triethanolamine type.
7. The cement slurry of claim 1, wherein the cement-to-water-cement ratio is 0.5-0.6, and the cement slurry density is 1.25-1.45g/cm3The cement slurry thickening time is between 130 and 220 minutes, and the cement stone permeability is less than 0.1 multiplied by 10-3μm2The 50 ℃/48h compressive strength is more than 14MPa, and the maximum compressive strength is 19 MPa.
8. Use of a cement slurry according to any of claims 1 to 7 for cementing wells in a subterranean formation.
9. Use according to claim 8, wherein the oil layer is a low pressure, easily leaking oil layer.
10. Method for preparing a cement slurry according to any of claims 1 to 7, characterized in that it comprises the following steps:
(1) calculating the weight of cement and water, and respectively weighing the water and the cement;
(2) weighing the lightening admixture, and adding the lightening admixture into the water in the step (1) under stirring;
(3) weighing the reinforcing agent, and adding the reinforcing agent into the solution in the step (2) under stirring;
(4) weighing the fluid loss agent, and adding the fluid loss agent into the solution in the step (3) under stirring;
(5) weighing the early strength agent, and adding the early strength agent into the solution in the step (4) under stirring;
(6) weighing a retarder, and adding the retarder into the solution in the step (5) under stirring;
(7) adding the cement weighed in the step (1) into the solution in the step (6), and stirring to obtain cement paste;
(8) and (4) pouring the cement paste obtained after stirring in the step (7) into a slurry cup, and stirring at room temperature to obtain the cement paste.
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