CN108276974B - Deepwater constant-current transformation synthetic base drilling fluid - Google Patents
Deepwater constant-current transformation synthetic base drilling fluid Download PDFInfo
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Abstract
The invention provides a deepwater constant-rheology synthetic base drilling fluid, belonging to the field of petroleum and natural gas deepwater drilling engineering. The invention comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 1.5-3.0 parts of emulsifier, 1-2 parts of alkalinity regulator, 0.5-1.5 parts of organic soil, 1-3 parts of synthetic organic matter filtrate reducer, 0.5-1.0 part of natural organic matter filtrate reducer and 0-100 parts of weighting agent. The invention improves the constant-current property of the deepwater constant-current variable synthetic base drilling fluid by the synergistic action of the emulsifier, the synthetic organic filtrate reducer and the natural organic filtrate reducer, has the characteristic of real constant current change, and has small changes of apparent viscosity, plastic viscosity, dynamic shear force and 3-turn reading, and the maximum difference value of the amplitude is less than 3 under each temperature condition.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas deepwater drilling engineering, in particular to a deepwater constant-current synthetic base drilling fluid.
Background
With the increasing of energy demand, the marine oil and gas exploration is gradually going from offshore to deep sea, and the exploration and development of deep sea face a series of drilling engineering technical problems caused by deep water and ultra-deep water, and a series of problems that pipelines are blocked by natural gas hydrate on the drilling faces of deep water and ultra-deep water, drilling fluid runs due to excessive low-temperature viscosity of the drilling fluid, and well walls are unstable due to under-compaction of deep water strata and the like. Oil-based drilling fluids and synthetic-based drilling fluids are the best choice to address the above problems. The temperature of the deep water and the ultra-deep water is sharply reduced along with the increase of the water depth, the deep water and the ultra-deep water are basically at extremely low temperature in a section of 300-3000 m, particularly the temperature near a mud line is only about 4 ℃, and in the drilling process, the drilling fluid still maintains a low temperature when returning to a drilling platform due to the cooling effect of the seabed low-temperature seawater when circulating, and the problems of excessive viscosity, slurry leakage and the like of the drilling fluid after returning to the platform can be caused because the rheological property of the traditional oil-based drilling fluid and the traditional synthetic-based drilling fluid is greatly influenced by the temperature, so that the deep-water drilling operation is severely restricted. Aiming at the problem, a large amount of researches are carried out at home and abroad, and a concept of constant rheology is provided, namely the rheological property of the drilling fluid is kept constant within a certain temperature range (4-65 ℃), and particularly the dynamic shear force and the 3-turn reading value are constant.
The traditional oil-based drilling fluid is basically prepared from diesel oil and mineral white oil, and the raw materials have certain toxicity, so that the synthetic-based drilling fluid is often adopted in deep water or ultra-deep water.
Although a great deal of literature and patents at home and abroad propose the concept of constant current variation, and the drilling fluid is determined to have the characteristic of constant current variation according to the dynamic shear force and the 3-turn reading within the range of 4-65 ℃, the problems that the apparent viscosity and the plastic viscosity increase along with the reduction of the temperature and the increase amplitude is large still exist, for example, the problems that the apparent viscosity and the plastic viscosity increase along with the reduction of the temperature and the drilling fluid brings certain risk of leaking stratum during the pumping process in the drilling process are existed in Chinese patents CN102807848A, 201510952579.6 and 201510218323.2.
Disclosure of Invention
In view of the above, the invention aims to provide a deepwater constant-rheology synthetic base drilling fluid. The deepwater constant-rheology synthetic base drilling fluid provided by the invention has small variation amplitude of apparent viscosity and plastic viscosity along with temperature, and the maximum difference value under each temperature condition is less than 3.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a deepwater constant-rheology synthetic base drilling fluid which comprises the following components in parts by weight:
preferably, the oil-water mixed phase comprises 70-85 parts by volume of the synthetic base liquid and 15-30 parts by volume of the calcium chloride aqueous solution.
Preferably, the synthetic base fluid comprises gas oil and C8～20N-alkanes and C8～20One or more than one of the isoparaffins; the mass fraction of the calcium chloride aqueous solution is 20-40%.
Preferably, the emulsifier is prepared from the following components in parts by weight: 15-20 parts of tall oil fatty acid, 15-20 parts of oleic acid, 15-20 parts of erucic acid, 10-20 parts of octadecatrienoic acid, 15-20 parts of diethylenetriamine and 5-10 parts of glycerol.
Preferably, the alkalinity regulator comprises one or more of calcium oxide, magnesium oxide and calcium hydroxide.
Preferably, the synthetic organic filtrate reducer is a nano polystyrene acrylic emulsion.
Preferably, the nano polystyrene acrylic emulsion is prepared from the following components in parts by weight: 100 parts of water, 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin, 2 parts of polyvinyl alcohol, 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene, 20 parts of vinyl chloride, 2 parts of ammonium persulfate and 5 parts of calcium oxide.
Preferably, the natural organic matter fluid loss additive comprises one or more of natural asphalt, natural oxidized asphalt and humic acid amide resin.
Preferably, the weighting agent is barite and/or calcium carbonate.
Preferably, the organo-soil comprises an organobentonite.
The invention provides a deepwater constant-rheology synthetic base drilling fluid which comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 1.5-3.0 parts of emulsifier, 1-2 parts of alkalinity regulator, 0.5-1.5 parts of organic soil, 1-3 parts of synthetic organic matter filtrate reducer, 0.5-1.0 part of natural organic matter filtrate reducer and 0-100 parts of weighting agent. According to the invention, the constant-current property of the deepwater constant-current variable synthetic base drilling fluid is improved through the synergistic effect of the emulsifier, the synthetic organic filtrate reducer and the natural organic filtrate reducer, the characteristic of 'constant current change' is truly realized, the changes of apparent viscosity, plastic viscosity, dynamic shear force and 3-turn reading are small, and the change range is that the maximum difference value under each temperature condition is less than 3; in addition, the deepwater constant-rheology synthetic base drilling fluid provided by the invention has the characteristics of high electrical stability and low water loss at high temperature and high pressure; according to the invention, the density adjustment range of the deepwater constant-rheology synthetic base drilling fluid can reach 0.9-1.6 g/cm by adjusting the dosage of the weighting agent3The requirement of deep water and ultra deep water drilling can be met; the deepwater constant-rheology synthetic base drilling fluid provided by the invention has the characteristics of low biotoxicity and good degradability.
Detailed Description
The invention provides a deepwater constant-rheology synthetic base drilling fluid which comprises the following components in parts by weight:
in the invention, the oil-water mixed phase preferably comprises 70-85 parts by volume of synthetic base liquid and 15-30 parts by volume of calcium chloride aqueous solution. In the invention, the oil-water mixed phase is a matrix of the deepwater constant current transformation synthetic base drilling fluid. In the present invention, the synthetic base fluid preferably comprises a gas oil, C8～20N-alkanes and C8～20One or more than one of the isoparaffins; the mass fraction of the calcium chloride aqueous solution is preferably 20-40%, and more preferably 26-30%. When the synthetic base fluid is a mixture, the dosage ratio of each substance in the mixture is not particularly limited, and the mixture with any proportion can be adopted.
Based on 100 parts by weight of oil-water mixed phase, the deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 1.5-3.0 parts of emulsifier, preferably 2-2.5 parts. In the invention, the emulsifier is preferably prepared from the following components in parts by weight: 15-20 parts of tall oil fatty acid, 15-20 parts of oleic acid, 15-20 parts of erucic acid, 10-20 parts of octadecatrienoic acid, 15-20 parts of diethylenetriamine and 5-10 parts of glycerol. In the present invention, the emulsifier is an integral emulsifier.
In the present invention, the preparation method of the emulsifier preferably comprises the steps of:
mixing tall oil fatty acid, oleic acid and erucic acid, heating to 160 ℃, vacuumizing to-0.1 MPa for grafting reaction for 2h, adding octadecatrienoic acid, continuing to heat to 320 ℃ within 1h for grafting reaction for 5h, cooling to 200 ℃ within 30min, adding diethylenetriamine, continuing to neutralize and dehydrate and imidazole for reaction for 2h, cooling to 70 ℃ within 1h, adding 5-10 parts of glycerol, and refluxing under reduced pressure for 2h for dehydration to obtain the emulsifier.
Based on 100 parts by weight of oil-water mixed phase, the deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 1-3.0 parts of synthetic organic matter filtrate reducer, preferably 2-2.5 parts. In the invention, the synthetic organic filtrate reducer is preferably nano polystyrene acrylic emulsion. In the invention, the nano polystyrene acrylic emulsion is preferably prepared from the following components in parts by weight: 100 parts of water, 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin, 2 parts of polyvinyl alcohol, 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene, 20 parts of vinyl chloride, 2 parts of ammonium persulfate and 5 parts of calcium oxide. In the invention, the synthetic organic filtrate reducer is a liquid filtrate reducer.
In the present invention, the preparation method of the nano polystyrene acrylic emulsion preferably comprises the following steps:
mixing water, fatty alcohol-polyoxyethylene ether, kaolin and polyvinyl alcohol, adding acrylic acid, acrylic ester, styrene and vinyl chloride, continuously introducing nitrogen to perform an emulsification reaction for 2 hours, adding ammonium persulfate, heating to 120 ℃, controlling the pressure to be 1.2-1.5 MPa, performing a polymerization reaction to obtain a polymerization product, cooling the polymerization product to 70 ℃ within 1 hour, preserving the temperature for 3 hours, adding calcium oxide, and performing a neutralization reaction to obtain the nano polystyrene acrylic emulsion.
The deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 0.5-1.0 part of natural organic matter filtrate reducer based on 100 parts by weight of oil-water mixed phase. In the invention, the natural organic matter fluid loss additive comprises one or more of natural asphalt, natural oxidized asphalt and humic acid amide resin; when the natural organic filtrate reducer is a mixture, the dosage ratio of the natural organic filtrate reducer in the mixture is not particularly limited, and the mixture with any proportion can be adopted.
The invention improves the constant-current denaturation performance of the deepwater constant-current-transformation synthetic-base drilling fluid through the synergistic action of the emulsifier, the synthetic organic matter filtrate reducer and the natural organic matter filtrate reducer, has the characteristic of real 'constant rheology', has small changes in apparent viscosity, plastic viscosity, dynamic shear force and 3-turn reading, and has the maximum difference value of less than 3 under various temperature conditions, and simultaneously has the characteristics of high electrical stability and low high-temperature and high-pressure water loss through the combined action of the emulsifier, the synthetic organic matter filtrate reducer and the natural organic matter filtrate reducer.
Based on 100 parts by weight of oil-water mixed phase, the deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 1-2 parts of alkalinity regulator, and preferably 1.5 parts. In the invention, the alkalinity regulator preferably comprises one or more of calcium oxide, magnesium oxide and calcium hydroxide, and when the alkalinity regulator is a mixture, the dosage ratio of each alkalinity regulator in the mixture is not particularly limited, and the mixture with any proportion can be adopted.
The deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 0-100 parts of weighting agent, preferably 32-50 parts, based on 100 parts by weight of oil-water mixed phase. In the present invention, the weighting agent is preferably barite and/or calcium carbonate. According to the invention, the weighting agent can adjust the density of the deepwater constant-current rheological synthetic base drilling fluid, and the density of the deepwater constant-current rheological synthetic base drilling fluid can meet the requirements of deepwater and ultra-deepwater drilling by adjusting the dosage of the weighting agent.
The deepwater constant-rheology synthetic base drilling fluid provided by the invention comprises 0.5-1.5 parts of organic soil, preferably 1.0 part, based on 100 parts by weight of oil-water mixed phase. In the present invention, the organic soil is preferably an organobentonite. The source of the organic soil is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the invention, the preparation method of the deepwater constant current change synthetic base drilling fluid in the technical scheme preferably comprises the following steps:
mixing the oil-water mixed phase, an emulsifier, an alkalinity regulator, organic soil, a synthetic organic matter filtrate reducer, a natural organic matter filtrate reducer and a weighting agent to obtain the deepwater constant-current-transformation synthetic-base drilling fluid.
The adding sequence of the oil-water mixed phase, the emulsifier, the alkalinity regulator, the organic soil, the synthetic organic filtrate reducer, the natural organic filtrate reducer and the weighting agent is not specially limited, and the adding sequence is well known by the technicians in the field; the specific mixing manner of the present invention is not particularly limited, and the manner known to those skilled in the art can be adopted to mix the raw materials uniformly, such as stirring.
The deepwater constant rheology synthetic base drilling fluid provided by the invention is described in detail by the following examples, but the deepwater constant rheology synthetic base drilling fluid cannot be understood as limiting the protection scope of the invention.
Example 1
The deepwater constant-current-change synthetic-base drilling fluid comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 1.5 parts of emulsifier, 1 part of calcium oxide, 1.5 parts of organic bentonite, 3 parts of nano styrene acrylic emulsion, 0.5 part of natural asphalt and 0 part of weighting agent.
The oil-water mixed phase is a mixed phase of a synthetic base liquid and calcium chloride brine, and specifically comprises 70 parts of the synthetic base liquid and 30 parts of a calcium chloride aqueous solution; the synthetic base liquid is gas-to-liquid oil; the mass fraction of the calcium chloride aqueous solution is 20%.
The synthesis process of the emulsifier comprises the following steps: mixing 15 parts of tall oil fatty acid, 15 parts of oleic acid and 15 parts of erucic acid, heating to 160 ℃, vacuumizing to-0.1 MPa, reacting for 2 hours, adding 10 parts of octadecatrienoic acid, continuously heating to 320 ℃, reacting for 5 hours, cooling to 200 ℃, adding 15 parts of diethylenetriamine, continuously reacting for 2 hours, cooling to 70 ℃, adding 5 parts of glycerol, and carrying out decompression reflux for 2 hours to obtain the emulsifier.
The synthesis process of the nano styrene acrylic emulsion comprises the following steps: adding 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin and 2 parts of polyvinyl alcohol into 100 parts of water, stirring uniformly, adding 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene and 20 parts of vinyl chloride, continuously stirring under the condition of continuously introducing nitrogen to emulsify for 2 hours, adding 2 parts of ammonium persulfate, heating to 120 ℃, controlling the pressure to be 1.2MPa, reacting for 3 hours, reducing the temperature to 70 ℃, adding 5 parts of calcium oxide, and continuously reacting for 1 hour to obtain the synthetic organic filtrate reducer.
The preparation method of the deepwater constant current change synthetic base drilling fluid comprises the following steps:
and uniformly mixing the oil-water mixed phase, the emulsifier, the alkalinity regulator, the organic soil, the synthetic organic filtrate reducer and the natural organic filtrate reducer under stirring to obtain the deepwater constant-current-transformation synthetic-base drilling fluid.
Example 2
The deepwater constant-current-change synthetic-base drilling fluid comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 3.0 parts of emulsifier, 2 parts of calcium oxide, 0.5 part of organic bentonite, 1 part of synthetic organic matter filtrate reducer, 1.0 part of humic acid amide resin and 32 parts of barite.
The oil-water mixed phase is a mixed phase of synthetic base liquid and calcium chloride brine, specifically 75 parts of synthetic base liquid and 25 parts of calcium chloride aqueous solution, wherein the synthetic base liquid is isoalkane (C)8～20) The mass fraction of the calcium chloride aqueous solution is 40%.
The synthesis process of the emulsifier comprises the following steps: mixing 20 parts of tall oil fatty acid, 20 parts of oleic acid and 20 parts of erucic acid, heating to 160 ℃, vacuumizing to-0.1 MPa, reacting for 2 hours, adding 20 parts of octadecatrienoic acid, continuously heating to 320 ℃, reacting for 5 hours, cooling to 200 ℃, adding 20 parts of diethylenetriamine, continuously reacting for 2 hours, cooling to 70 ℃, adding 10 parts of glycerol, and carrying out decompression reflux for 2 hours to obtain the emulsifier.
The synthetic organic filtrate reducer is nano styrene acrylic emulsion, and the specific synthetic process comprises the following steps: adding 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin and 2 parts of polyvinyl alcohol into 100 parts of water, stirring uniformly, adding 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene and 20 parts of vinyl chloride, continuously stirring under the condition of continuously introducing nitrogen to emulsify for 2 hours, adding 2 parts of ammonium persulfate, heating to 120 ℃, controlling the pressure to be 1.5MPa, reacting for 3 hours, reducing the temperature to 70 ℃, adding 5 parts of calcium oxide, and continuously reacting for 1 hour to obtain the synthetic organic filtrate reducer.
The preparation method of the deepwater constant current change synthetic base drilling fluid is the same as that of the deepwater constant current change synthetic base drilling fluid in the embodiment 1.
Example 3
The deepwater constant-current-change synthetic-base drilling fluid comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 2.0 parts of emulsifier, 1.5 parts of calcium hydroxide, 1.0 part of organic bentonite, 2 parts of synthetic organic matter filtrate reducer, 0.5 part of oxidized asphalt and 50 parts of heavy calcium carbonate.
The oil-water mixed phase is a mixed phase of synthetic base liquid and calcium chloride brine, specifically 80 parts of synthetic base liquid and 20 parts of calcium chloride aqueous solution, and the synthetic base liquid is normal alkane (C)8～20) The mass fraction of the calcium chloride aqueous solution is 26 percent.
The synthesis process of the emulsifier comprises the following steps: mixing 15 parts of tall oil fatty acid, 20 parts of oleic acid and 10 parts of erucic acid, heating to 160 ℃, vacuumizing to-0.1 MPa, reacting for 2 hours, adding 20 parts of octadecatrienoic acid, continuously heating to 320 ℃, reacting for 5 hours, cooling to 200 ℃, adding 15 parts of diethylenetriamine, continuously reacting for 2 hours, cooling to 70 ℃, adding 5 parts of glycerol, and carrying out decompression reflux for 2 hours to obtain the emulsifier.
The synthetic organic filtrate reducer is nano styrene acrylic emulsion, and the specific synthetic process comprises the following steps: adding 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin and 2 parts of polyvinyl alcohol into 100 parts of water, stirring uniformly, adding 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene and 20 parts of vinyl chloride, continuously stirring under the condition of continuously introducing nitrogen to emulsify for 2 hours, adding 2 parts of ammonium persulfate, heating to 120 ℃, controlling the pressure to be 1.5MPa, reacting for 3 hours, reducing the temperature to 70 ℃, adding 5 parts of calcium oxide, and continuously reacting for 1 hour to obtain the synthetic organic filtrate reducer.
The preparation method of the deepwater constant current change synthetic base drilling fluid is the same as that of the deepwater constant current change synthetic base drilling fluid in the embodiment 1.
Example 4
The deepwater constant-current-change synthetic-base drilling fluid comprises the following components in parts by weight: 100 parts of oil-water mixed phase, 3.0 parts of emulsifier, 1.5 parts of alkalinity regulator (calcium oxide and calcium hydroxide are compounded according to the mass ratio of 1: 1), 1.0 part of organic bentonite, 2 parts of synthetic organic matter filtrate reducer, 0.5 part of natural organic matter filtrate reducer (natural asphalt and humic acid amide resin are compounded according to the mass ratio of 1: 1), and 100 parts of barite.
The oil-water mixed phase is a mixed phase of synthetic base liquid and calcium chloride brine, specifically 85 parts of synthetic base liquid and 15 parts of calcium chloride aqueous solution, wherein the synthetic base liquid is isoalkane (C)8～20) The mass fraction of the calcium chloride aqueous solution is 30 percent.
The synthesis process of the emulsifier comprises the following steps: mixing 20 parts of tall oil fatty acid, 20 parts of oleic acid and 15 parts of erucic acid, heating to 160 ℃, vacuumizing to-0.1 MPa, reacting for 2 hours, adding 15 parts of octadecatrienoic acid, continuously heating to 320 ℃, reacting for 5 hours, cooling to 200 ℃, adding 15 parts of diethylenetriamine, continuously reacting for 2 hours, cooling to 70 ℃, adding 10 parts of glycerol, and carrying out decompression reflux for 2 hours to obtain the emulsifier.
The synthetic organic filtrate reducer is nano styrene acrylic emulsion, and the specific synthetic process comprises the following steps: adding 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin and 2 parts of polyvinyl alcohol into 100 parts of water, stirring uniformly, adding 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene and 20 parts of vinyl chloride, continuously stirring under the condition of continuously introducing nitrogen to emulsify for 2 hours, adding 2 parts of ammonium persulfate, heating to 120 ℃, controlling the pressure to be 1.2MPa, reacting for 3 hours, reducing the temperature to 70 ℃, adding 5 parts of calcium oxide, and continuously reacting for 1 hour to obtain the synthetic organic filtrate reducer.
The preparation method of the deepwater constant current change synthetic base drilling fluid is the same as that of the deepwater constant current change synthetic base drilling fluid in the embodiment 1.
Comparative example 1
Commercial SPE90987 plate flow synthetic base drilling fluid, unknown density.
Comparative example 2
Chinese patent application publication No. CN 104861944A is a deepwater constant-flow variable oil-base drilling fluid, rho is 1.5g/cm3。
Comparative example 3
Chinese patent No. CN 102807848B is a coal-to-liquid deep water constant-current synthetic base drilling fluid.
The performance of the drilling fluids of examples 1 to 4 and comparative examples 1 to 3 is tested, and the results are shown in table 1, and it can be seen from table 1 that the deepwater constant-rheology synthetic base drilling fluid prepared by the invention has differences of apparent viscosity, plastic viscosity and dynamic shear force of less than or equal to 3 at different temperatures, so that real 'constant rheology' is realized, compared with the comparative examples, the difference of apparent viscosity and plastic viscosity is smaller, several comparative examples have larger differences of apparent viscosity and plastic viscosity, only the dynamic shear force is expressed as 'constant', and the deepwater constant-rheology synthetic base drilling fluid prepared by the invention realizes the 'constant' of rheology performance at any temperature within the range of 4 to 65 ℃.
TABLE 1 basic Properties of the drilling fluids of examples 1-4 and comparative examples 1-3
The anti-pollution performance of the deepwater constant-current-change synthetic-base drilling fluid in the embodiment is further evaluated, so that whether the oil-base drilling fluid is influenced by external pollutants is judged, the example 2 is taken as an example to carry out serialized anti-pollution performance evaluation, and the result is shown in table 2, and the table 2 shows that the deepwater constant-current-change synthetic-base drilling fluid still shows good rheological stability after being polluted by the external pollutants, and can meet the requirements of deepwater and ultra-deepwater on the low-temperature rheological property of the drilling fluid.
Table 2 anti-pollution performance table of deepwater constant rheology synthetic base drilling fluid prepared in example 2
Note: in tables 1 and 2:
ρ: density of drilling fluid in g/cm3
T: drilling fluid aging temperature, deg.C
TMeasuring: drilling fluid rheology test temperature, deg.C
AV: apparent viscosity of drilling fluid, mPa s
PV: plastic viscosity of drilling fluid, mPa s
YP: drilling fluid dynamic shear force, Pa
Phi 3: six-speed rotary viscometer with 3-turn reading and no dimension
HTHP: drilling fluid loses water (3.5MPa, T, 30min) at high temperature and high pressure, mL
ES: drilling fluid electrical stability, V.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The deepwater constant-current-change synthetic-base drilling fluid comprises the following components in parts by weight:
100 parts of oil-water mixed phase
1.5-3.0 parts of an emulsifier, wherein the emulsifier is prepared from the following components in parts by weight: 15-20 parts of tall oil fatty acid, 15-20 parts of oleic acid, 15-20 parts of erucic acid, 10-20 parts of octadecatrienoic acid, 15-20 parts of diethylenetriamine and 5-10 parts of glycerol;
1-2.0 parts of alkalinity regulator
0.5-1.5 parts of organic soil
1-3.0 parts of a synthetic organic filtrate reducer, wherein the synthetic organic filtrate reducer is a nano polystyrene acrylic emulsion prepared from the following components in parts by weight: 100 parts of water, 5 parts of fatty alcohol-polyoxyethylene ether, 5 parts of kaolin, 2 parts of polyvinyl alcohol, 10 parts of acrylic acid, 30 parts of acrylate, 50 parts of styrene, 20 parts of vinyl chloride, 2 parts of ammonium persulfate and 5 parts of calcium oxide;
0.5-1.0 part of natural organic filtrate reducer
0-100 parts of weighting agent.
2. The deep-water constant-rheology synthetic base drilling fluid according to claim 1, wherein the oil-water miscible phase comprises 70-85 parts by volume of a synthetic base fluid and 15-30 parts by volume of a calcium chloride aqueous solution.
3. The deepwater constant current change synthetic base drilling fluid as claimed in claim 2, wherein the synthetic base fluid comprises gassed oil, C8～20N-alkanes and C8～20One or more than one of the isoparaffins; the mass fraction of the calcium chloride aqueous solution is 20-40%.
4. The deepwater constant rheology synthetic based drilling fluid of claim 1 wherein the alkalinity modifier comprises one or more of calcium oxide, magnesium oxide and calcium hydroxide.
5. The deepwater constant-rheology synthetic-based drilling fluid according to claim 1, wherein the natural organic fluid loss additive comprises one or more of natural asphalt, natural oxidized asphalt and humic acid amide resin.
6. The deepwater constant rheology synthetic based drilling fluid of claim 1 wherein the weighting agent is barite and/or calcium carbonate.
7. The deepwater invariable rheology synthetic based drilling fluid according to claim 1 wherein the organic soil comprises an organic bentonite.
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| CN116410709A (en) * | 2021-12-31 | 2023-07-11 | 中国石油天然气集团有限公司 | Synthetic base drilling fluid with flat plate flow pattern characteristics and preparation method thereof |
| CN116948614A (en) * | 2023-06-30 | 2023-10-27 | 中国石油天然气集团有限公司 | Environment-friendly high-temperature-resistant soilless phase low-oil-water ratio synthetic base drilling fluid and preparation method and application thereof |
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