CN110776881B - Bionic lubricant for drilling fluid and preparation method and application thereof - Google Patents
Bionic lubricant for drilling fluid and preparation method and application thereof Download PDFInfo
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- CN110776881B CN110776881B CN201810854349.XA CN201810854349A CN110776881B CN 110776881 B CN110776881 B CN 110776881B CN 201810854349 A CN201810854349 A CN 201810854349A CN 110776881 B CN110776881 B CN 110776881B
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- 239000000314 lubricant Substances 0.000 title claims abstract description 73
- 238000005553 drilling Methods 0.000 title claims abstract description 64
- 239000012530 fluid Substances 0.000 title claims abstract description 51
- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
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- 241001264766 Callistemon Species 0.000 claims abstract description 53
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 29
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 29
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- 238000003756 stirring Methods 0.000 claims description 41
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- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 2
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- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
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- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 229920013639 polyalphaolefin Polymers 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a drilling fluid bionic lubricant in the technical field of oil field drilling fluid, a preparation method and application thereof; the bionic lubricant for the drilling fluid comprises the following components in parts by weight: 100 parts of water, 2-15 parts of a bottle brush type polymer, 1-5 parts of sodium alginate and 1-10 parts of long-chain fatty alcohol; the drilling fluid lubricant in the prior art has the common problems that the drilling fluid lubricant is poor in hydrophilicity and is negatively charged, and can be influenced by competitive adsorption of other hydrophilic materials in the drilling fluid, so that the adsorption quantity on the surfaces of a drilling tool and a negatively charged borehole wall mud cake is small, and the lubricating effect is seriously influenced; the bionic lubricant for the drilling fluid provided by the invention can be well adsorbed on the surfaces of drilling tools and well wall mud cakes, enables the friction surface to be highly hydrated, has a better and more durable lubricating effect than the prior art, and has a better application prospect.
Description
Technical Field
The invention relates to the technical field of drilling fluid for oil fields, in particular to a drilling fluid bionic lubricant and a preparation method and application thereof.
Background
With the increasing exhaustion of oil and gas resources, deep horizontal well drilling has gradually become an important technical means for developing deep oil and gas reservoirs. Because the oil and gas reservoir is buried deeply and has deep deflecting points, and higher friction resistance and torque exist in the drilling process of the deflecting section and the horizontal section of the deep horizontal well, the drilling speed and the well track control are seriously influenced, the safety of drilling operation is threatened, the core problem of restricting the extension length of the horizontal section of the deep horizontal well is solved, and the higher requirement is provided for the lubricating property of the drilling fluid.
The lubricant is an important additive of drilling fluid, and has the functions of reducing the frictional resistance between the drilling tool and the well wall and between the drilling tool and the metal casing pipe, preventing the mud from wrapping the drill bit, and further achieving the purposes of improving the drilling speed, preventing the drill from being stuck and slowing down the abrasion of the drilling tool. Prior art drilling fluid lubricants fall into two broad categories, solid and liquid lubricants. The solid lubricant mainly comprises spherical particles such as synthetic polymer pellets, glass pellets, ceramic pellets and the like and particles with a lamellar structure such as graphite, and provides a lubricating effect by separating two friction interfaces and converting a friction mode between the two interfaces. Liquid lubricants are mainly comprised of refined mineral oils, polyalphaolefins, vegetable oils, modified vegetable oils, synthetic fatty acid esters and the like. The conventional liquid lubricants generally have the problems of poor hydrophilicity and negative charge, and can be influenced by competitive adsorption of other hydrophilic materials in drilling fluid, so that the adsorption quantity on the surfaces of a drilling tool and a negatively charged borehole wall mud cake is small, and the lubricating effect is seriously influenced. In addition, the traditional liquid lubricants also have the defects of influencing the rheological property of the drilling fluid, being easy to foam and consume, and the like.
In a living body, an extremely low friction coefficient is shown between interfaces in relative motion, for example, the friction coefficient between human articular cartilages is 0.001-0.030, the friction coefficient between eyelids and eyeballs can be as low as 0.005, and good lubricating performance is also shown between animal gastric mucosa. In a biological environment, the articular surfaces are in the fluid environment of the synovial fluid of the joints. Joint synovial fluid exists in freely moving joint cavities, a layer of adsorption film can be assembled on the surface of cartilage through interface interaction, so that a hydration layer is formed on the surface of the joint, extremely high-efficiency lubricating performance is achieved through hydration lubrication, and even an ultralow friction coefficient of 0.001-0.005 can be realized. Joint synovial fluid mainly comprises water-soluble biological macromolecules such as hyaluronic acid, lubricin and phospholipid molecules, wherein the lubricin plays a decisive role. The lubricin is a biological macromolecule with a bottle brush-shaped structure, the main chain of the lubricin is polypeptide, the branched chain of the lubricin is polysaccharide molecule, and the lubricin has high hydration and amphipathy. The unique structure of lubricin determines its characteristic properties. Firstly, the side chain of the bottle-brush-shaped oligosaccharide of the lubricin contains a large amount of hydroxyl groups, and a hydration layer can be formed through the action of hydrogen bonds; secondly, in electrical property, the lubricin belongs to polyampholyte, shows negative electricity characteristics as a whole and can form electrostatic interaction with the outside; in addition, the lubricin molecule has a glycosylated hydrophilic region and a non-glycosylated hydrophobic region at the same time, belongs to an amphiphilic molecule, and has obvious hydrophobic effect. Because of the many excellent properties of the lubricin molecules, they can interact with the friction surface through hydrogen bonding, electrostatic interactions and hydrophobic interactions, thereby exerting a very efficient lubrication effect.
However, large-scale recombinant production of glycoproteins is still challenging at present due to the multiple amino acid repeats in the protein core structure of lubricin and its high degree of glycosylation. In addition, the main components of the well wall mud cake are silicate clay such as montmorillonite, the surface of the well wall mud cake is negatively charged, so that the affinity of the integrally negatively charged lubricant molecules on the surface of the mud cake is weak, the lubricant molecules are difficult to firmly adsorb, and a good hydration lubrication effect is exerted. Therefore, there is a need for a biomimetic of lubricin capable of providing boundary lubrication that, in addition to having a highly hydrated brush-like molecular structure, should be overall positively charged to facilitate adsorption on the surface of the sidewall mudcake by electrostatic interaction.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a bionic lubricant for drilling fluid. In particular to a drilling fluid bionic lubricant and a preparation method and application thereof. The bionic lubricant for the drilling fluid has the characteristics of good adsorption on the surfaces of a drilling tool and a borehole wall mud cake and high hydration of a friction surface.
One purpose of the invention is to provide a bionic lubricant for drilling fluid, which comprises the following components in parts by weight:
100 parts by weight of water, wherein the water is selected from deionized water and/or distilled water;
2-15 parts by weight of a bottle brush type polymer, preferably 3-10 parts by weight, and more preferably 5-8 parts by weight;
1-5 parts of sodium alginate, preferably 2-5 parts of sodium alginate, and more preferably 3-4 parts of sodium alginate;
1-10 parts by weight of long-chain fatty alcohol, preferably 2-8 parts by weight, and more preferably 3-5 parts by weight.
Wherein,
the main component of the drilling fluid bionic lubricant is a bottle brush type polymer simulating a biological lubricin structure. The bottle brush polymer is polylysine-graft-polyethylene glycol copolymer (abbreviated as PLL-g-PEG).
The polylysine-graft-polyethylene glycol copolymer structure can comprise:
(i) a polylysine backbone. The hydrodynamic size of the bottle brush polymer is at least 80nm and can range up to 100-120 nm. The number average molecular weight of the polylysine backbone thus suitably ranges from 20kDa to 300kDa, preferably from 50kDa to 200kDa, more preferably from 100kDa to 150 kDa.
(ii) Polyethylene glycol brush segment. The number average molecular weight of the polyethylene glycol brush segment is in the range of 1kDa to 20kDa, preferably 2kDa to 10 kDa. The length and the grafting density of the PEG chain have great influence on the lubricating effect, the length and the grafting density of the PEG chain are increased, the friction force is reduced, and the lubricating effect is improved. In addition, in the friction process, the polymer can be adsorbed to a worn surface under the electrostatic action, and the self-repairing function is achieved.
The preparation method of the bottle brush type polymer can comprise the following steps:
dissolving polylysine in water (specifically deionized water or distilled water) (specifically adding polylysine into a three-neck flask with a thermometer and a mechanical stirrer, then adding water to dissolve the polylysine), and adjusting the pH of the solution to 8-9 by using an alkaline substance (specifically sodium hydroxide or potassium hydroxide); and then adding methoxy polyethylene glycol-succinimidyl propionate into the solution, stirring and reacting for a certain time (18-24 hours) at room temperature, drying the product solution at 105-120 ℃, and crushing to obtain the bottle brush type polymer PLL-g-PEG.
Wherein the weight ratio of polylysine to methoxypolyethylene glycol-succinimidyl propionate is 1: (2-10), preferably 1: (6-10); this ratio range is set in consideration of the above graft density.
Sodium alginate may also be included in the drilling fluid lubricant composition of the present invention. The sodium alginate is used for simulating hyaluronic acid in joint synovial fluid, and can be directly adsorbed on a friction surface to serve as a boundary lubricant to enhance the lubricating effect; on the other hand, the bottle brush polymer can be assembled on a sodium alginate molecular chain through hydrophobic interaction to form a brush type assembly body with a secondary structure, wherein the sodium alginate is used as a main chain, and the bottle brush polymer is used as a side chain, so that the hydration lubrication effect is further improved. The sodium alginate may have a number average molecular weight of 10kDa to 200kDa, preferably 100kDa to 150 kDa.
The drilling fluid lubricant composition of the present invention also comprises a long chain fatty alcohol. Besides the function of enhancing lubrication, the long-chain fatty alcohol plays a more important role in inhibiting foaming of the lubricant and avoiding influence on water feeding of a slurry pump in site construction due to foaming of the lubricant. The long-chain fatty alcohol can be selected from at least one of dodecanol, tetradecanol, hexadecanol and octadecanol, and is preferably hexadecanol.
The invention also aims to provide a preparation method of the drilling fluid bionic lubricant, which comprises the following steps:
adding water (deionized water and/or distilled water) into a reaction kettle with a stirrer at room temperature, sequentially adding long-chain fatty alcohol and a bottle brush type polymer under the stirring condition, and stirring (for 10-20 minutes) to completely dissolve the long-chain fatty alcohol and the bottle brush type polymer in the water; and then adding sodium alginate into the reaction kettle, and stirring (for 1-2 hours) to obtain the bionic lubricant for the drilling fluid, wherein the bionic lubricant is light yellow viscous liquid.
The invention also aims to provide the application of the bionic lubricant for the drilling fluid in the drilling fluid.
Compared with the prior art, the bionic lubricant for drilling fluid provided by the invention has the main advantages that:
(1) the core component in the bionic lubricant is a polymer with a bottle brush-shaped structure, the polymer can be highly hydrated, and the characteristics that flowable water is filled among molecular chains form a base stone with excellent lubricating property of the synovial joint;
(2) other components of the biomimetic lubricant include sodium alginate. The sodium alginate is used for simulating hyaluronic acid in joint synovial fluid, and can be directly adsorbed on a friction surface to serve as a boundary lubricant to enhance the lubricating effect; on the other hand, the bottle brush polymer can be assembled on a sodium alginate molecular chain through hydrophobic interaction to form a brush type assembly body with a secondary structure, wherein the sodium alginate is used as a main chain, and the bottle brush polymer is used as a side chain, so that the hydration lubrication effect is further improved;
(3) other components of the bionic lubricant also comprise long-chain fatty alcohol. The long-chain fatty alcohol can not only enhance the lubricating effect, but also inhibit the foaming of the lubricant, and avoid the influence on the water feeding of a slurry pump in site construction due to the foaming of the lubricant;
(4) the main advantage of the bionic lubricant lies in the synergistic effect among the components, namely the synergistic effect among the bottle brush type polymer, the long-chain fatty alcohol and the sodium alginate. This is also the main reason for the highly effective lubrication of the biological lubricant. And the preparation cost of the whole bionic lubricant is far lower than that of a bottle brush polymer singly used, but the effect is better.
The drilling fluid lubricant in the prior art generally has the problems that the hydrophilicity is poor, the drilling fluid lubricant is negatively charged, and the influence of competitive adsorption of other hydrophilic materials in the drilling fluid can be caused, so that the adsorption quantity on the surfaces of a drilling tool and a negatively charged borehole wall mud cake is small, and the lubricating effect is seriously influenced. In addition, the traditional liquid lubricants also have the defects of influencing the rheological property of the drilling fluid, being easy to foam and consume, and the like.
The bionic lubricant for the drilling fluid provided by the invention can be well adsorbed on the surfaces of drilling tools and well wall mud cakes, enables the friction surfaces to be highly hydrated, has a better and more durable lubricating effect compared with the prior art, and has the advantages of easiness and environmental protection in preparation of bottle brush type polymers and bionic lubricants, stable product quality and easiness in large-scale production, so that the bionic lubricant has a better application prospect.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.
The starting materials used in the examples are all commercially available.
Example 1
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 100g of methoxypolyethylene glycol-succinimidyl propionate (number average molecular weight 2kDa) is added, the mixture is stirred and reacted for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 2g of cetyl alcohol and 5g of the bottle brush polymer PLL-g-PEG were added sequentially under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A1 is obtained after stirring for 1 hour.
Example 2
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 150g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight 2kDa) is added, the mixture is stirred and reacted for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 2g of cetyl alcohol and 5g of the bottle brush polymer PLL-g-PEG were added sequentially under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A2 is obtained after stirring for 1 hour.
Example 3
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 200g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight 2kDa) is added, stirring reaction is carried out for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 3g of cetyl alcohol and 5g of bottle brush polymer were added in this order under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A3 is obtained after stirring for 1 hour.
Example 4
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight of 20kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 150g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight 2kDa) is added, the mixture is stirred and reacted for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, 2g of stearyl alcohol and 5g of the bottle brush polymer PLL-g-PEG were added in this order with stirring, and stirring was carried out for 10 minutes to completely dissolve the stearyl alcohol and the bottle brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A4 is obtained after stirring for 1 hour.
Example 5
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight of 300kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 150g of methoxy polyethylene glycol-succinimidyl propionate (with the number average molecular weight of 10kDa) is added, the mixture is stirred and reacted for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 2g of cetyl alcohol and 5g of bottle brush polymer were added in this order under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A5 is obtained after stirring for 1 hour.
Example 6
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then adding 120g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight of 10kDa), stirring and reacting for 24 hours at room temperature, and then drying and crushing the product solution at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 5g of cetyl alcohol and 8g of bottle brush polymer were added in this order under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 4g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A6 is obtained after stirring for 1 hour.
Example 7
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then adding 120g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight of 10kDa), stirring and reacting for 24 hours at room temperature, and then drying and crushing the product solution at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 5g of cetyl alcohol and 5g of bottle brush polymer were added sequentially under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 4g of sodium alginate (100kDa) is added into the reaction kettle, and the bionic lubricant product A7 is obtained after stirring for 1 hour.
Example 8
To a 250mL three-necked flask equipped with a thermometer and a mechanical stirrer, 20g of polylysine (number average molecular weight 100kDa) was added, followed by addition of 150g of deionized water for dissolution, and the pH of the solution was adjusted to 8.5 with sodium hydroxide. Then 150g of methoxy polyethylene glycol-succinimidyl propionate (number average molecular weight of 5kDa) is added, the mixture is stirred and reacted for 24 hours at room temperature, and then the product solution is dried and crushed at 120 ℃ to obtain the bottle brush type polymer PLL-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 5g of cetyl alcohol and 5g of bottle brush polymer were added sequentially under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle brush polymer in the water. Then 4g of sodium alginate (50kDa) is added into the reaction kettle, and the bionic lubricant product A8 is obtained after stirring for 1 hour.
Comparative example 1
A commercially available pentaerythritol oleate lubricant (PETO, heian petrochemical plant, jiang su) was used as comparative lubricant B1 for lubrication performance comparison with the products of the examples.
Comparative example 2
A refined tall oil lubricant (DTO 30-50, long. maple chemical limited) available commercially as comparative lubricant B2 was used for lubrication performance comparison with the products of the examples.
Comparative example 3
The bottle brush polymer PLL-g-PEG from example A3 was used as comparative lubricant B3 for lubricating performance comparison with the products of the examples.
Comparative example 4
Prepare bottle brush type polymer PAA-g-PEG with a main chain of polyanion polymer (polyacrylic acid). The PAA-g-PEG is prepared based on the method disclosed in Chinese patent with the publication number of CN104870020A (application number of 201380065766.1), and the specific method steps are as follows: in a 250mL flask with a magnetic stir bar, 1g polyacrylic acid PAA (number average molecular weight 100000) and 61g methoxypolyethyleneglycol amine (PEG-NH) were stirred2) Dissolved in 0.1mol/L borate buffer (100mL, pH 8.5). To the above solution, 8g of 4- (4, 6-dimethoxy-1, 3,5, -triazin-2-yl) -4-methylmorpholine hydrochloric acid (DMTMM) dissolved in 0.1mol/L borate buffer (60mL) was added dropwise, and the pH was adjusted to 6-7 with dilute hydrochloric acid. Stirring and reacting for 24h at room temperature, drying the product solution at 120 ℃, and crushing to obtain a bottleThe brush polymer PAA-g-PEG.
100g of deionized water was added to a flask with stirring at room temperature, and 2g of cetyl alcohol and 5g of the bottle-brush polymer PAA-g-PEG were sequentially added under stirring, and stirred for 10 minutes to completely dissolve the cetyl alcohol and the bottle-brush polymer in the water. Then 3g of sodium alginate (100kDa) is added into the reaction kettle, and the comparative bionic lubricant product B4 is obtained after stirring for 1 hour.
Test examples extreme pressure friction resistance was measured using a fann212 type extreme pressure lubricator. The operation steps are as follows: firstly, the machine is checked by pure water, the torque reading is 0 when the machine is not pressurized, and the rotating speed is 60 r/min; the rotation speed is maintained at 60rpm when the pressure is 150inch pounds (inch-pounds); and then, operating the device for 5min under the condition of pressurizing to 150 inch-points, and testing the torque reading of the purified water to ensure that the torque reading of the purified water is between 28 and 42. The purified water was changed to the slurry to be tested and run under pressure of 150 inch-points for 5 minutes and the torque reading of the tested slurry was read. Before testing the torque of the slurry, the machine is checked by pure water.
The extreme pressure lubrication coefficient calculation formula is as follows:
extreme pressure lubrication coefficient ═ MSample (A)*(34/MWater (W)) X 100%, wherein:
Msample (A): an extreme pressure torque reading of the sample;
Mwater (W): an extreme pressure torque reading of purified water;
in the above tests, the test samples were drilling fluid-based slurries mixed with lubricants prepared in examples 1-8 (A1-A8) and comparative examples 1-4 (B1-B4), respectively: the drilling fluid base slurry comprises the following components: 5 wt% of xiazijie sodium bentonite, 0.2 wt% of anhydrous sodium carbonate and the balance of water, and hydrating for 24 hours at room temperature to prepare the xiazijie sodium bentonite; the example lubricant and the comparative lubricant were added to the base slurry in amounts of 3 wt%.
The measurement results are shown in table 1.
TABLE 1
| Sample (I) | Extreme pressure lubrication coefficient |
| A1 | 0.05 |
| A2 | 0.04 |
| A3 | 0.03 |
| A4 | 0.08 |
| A5 | 0.04 |
| A6 | 0.02 |
| A7 | 0.03 |
| A8 | 0.04 |
| B1 | 0.08 |
| B2 | 0.07 |
| B3 | 0.09 |
| B4 | 0.12 |
The data in Table 1 show that the extreme pressure lubrication coefficient of the drilling fluid adopting the lubricants A1-A8 is 0.02-0.08, which indicates that the drilling fluid has good lubricity and can effectively reduce the underground friction resistance and the torque; the extreme pressure lubrication coefficient of the drilling fluid B1-B2 adopting the traditional ester lubricant is higher and reaches 0.07-0.08, which shows that the lubricant has relatively better performance. Whereas B3 was only a single bottle brush polymer, the lubricating effect was weaker than the synergistic combination of components of example A3. The bottle brush polymer of B4 is PAA-g-PEG, the main chain is anionic polymer polyacrylic acid, which is negatively charged after being dissolved in water, and the well wall rock of the oil and gas well is also negatively charged, so that the PAA-g-PEG has relatively weak adsorbability on the surface of the well wall, and is not easy to form a firmly adsorbed lubricating film.
Claims (10)
1. The bionic lubricant for the drilling fluid comprises the following components in parts by weight:
100 parts by weight of water, and a solvent,
2 to 15 parts by weight of a bottle brush type polymer,
1-5 parts by weight of sodium alginate,
1-10 parts by weight of long-chain fatty alcohol;
wherein the water is selected from deionized water and/or distilled water;
the bottle brush type polymer is polylysine-graft-polyethylene glycol copolymer;
the polylysine-graft-polyethylene glycol copolymer structurally comprises the following components:
(i) a polylysine backbone having a number average molecular weight in the range of 20kDa to 300 kDa;
(ii) the polyethylene glycol brush section has the number average molecular weight ranging from 1kDa to 20 kDa; the preparation method of the bottle brush type polymer comprises the following steps:
dissolving polylysine in water, and adjusting the pH of the solution to 8-9; and then adding methoxy polyethylene glycol-succinimidyl propionate into the solution, stirring the mixture at room temperature for reaction, drying the product solution at 105-120 ℃, and crushing the product solution to obtain the bottle brush type polymer.
2. The drilling fluid bionic lubricant according to claim 1, characterized by comprising the following components in parts by weight:
100 parts by weight of water, and a solvent,
3 to 10 parts by weight of a bottle brush type polymer,
2-5 parts by weight of sodium alginate,
2-8 parts of long-chain fatty alcohol.
3. The drilling fluid biomimetic lubricant as recited in claim 1, wherein:
the number average molecular weight of the polylysine main chain ranges from 50kDa to 200 kDa;
the number average molecular weight range of the polyethylene glycol brush section is 2 kDa-10 kDa.
4. The drilling fluid biomimetic lubricant as recited in claim 1, wherein:
the weight ratio of the polylysine to the methoxypolyethylene glycol-succinimidyl propionate is 1: (2-10).
5. The drilling fluid biomimetic lubricant as recited in claim 4, wherein:
the weight ratio of the polylysine to the methoxypolyethylene glycol-succinimidyl propionate is 1: (6-10).
6. The drilling fluid biomimetic lubricant according to claim 1 or 2, characterized in that:
the number average molecular weight of the sodium alginate is 10 kDa-200 kDa.
7. The drilling fluid biomimetic lubricant as recited in claim 6, wherein:
the number average molecular weight of the sodium alginate is 100 kDa-150 kDa.
8. The drilling fluid biomimetic lubricant according to claim 1 or 2, characterized in that:
the long-chain fatty alcohol is selected from at least one of dodecanol, tetradecanol, hexadecanol and octadecanol.
9. The preparation method of the drilling fluid bionic lubricant according to any one of claims 1 to 8, characterized by comprising the following steps:
adding the water into a reaction kettle, sequentially adding the long-chain fatty alcohol and the bottle brush type polymer under the condition of stirring, and stirring to completely dissolve the long-chain fatty alcohol and the bottle brush type polymer in the water; and then adding the sodium alginate into the reaction kettle, and stirring to obtain the drilling fluid bionic lubricant.
10. Use of the drilling fluid biomimetic lubricant according to any of claims 1-8 in a drilling fluid.
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