CN114621735B - Drilling fluid hydration type lubricant and preparation method and application thereof - Google Patents
Drilling fluid hydration type lubricant and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a drilling fluid hydration type lubricant, a preparation method and application thereof, and belongs to the technical field of oilfield drilling fluids. The drilling fluid hydration lubricant disclosed by the invention comprises the following components in parts by weight: 90-110 parts of water, 2-12 parts of chitosan-graft-polyethylene glycol copolymer and 0.2-2 parts of carboxymethyl chitosan. The preparation method comprises the following steps: adding the water into a reaction kettle, heating to 40-60 ℃, sequentially adding the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer, and completely dissolving the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer into the water to obtain the chitosan-polyethylene glycol copolymer. The lubricant can be firmly adsorbed on the surface of a drilling tool, so that the friction surface is hydrated and lubricated, the adsorptivity on electronegative friction surfaces such as metals is stronger, and a firmer hydrated lubricating film can be provided. Meanwhile, the chitosan-graft-polyethylene glycol copolymer and carboxymethyl chitosan have synergistic effect when being used together, so that the lubrication effect can be greatly improved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of oilfield drilling fluid, and particularly relates to a drilling fluid hydration type lubricant, a preparation method and application thereof.
Background
With the increasing exhaustion of oil and gas resources, deep horizontal well drilling has become an important technical means for developing deep oil and gas reservoirs. Because the oil gas is buried deeply, the deflecting point is deep, and high friction and torque exist in the deep horizontal well deflecting section and the horizontal section drilling process, not only are the drilling speed and the well track control seriously affected, but also the safety of drilling operation is threatened, and the method is a core difficult problem for restricting the extending length of the horizontal section of the deep horizontal well, so that high requirements are put forward on the lubricating performance of drilling fluid.
The lubricant is an important additive of drilling fluid, and has the functions of reducing friction resistance between a drilling tool and a well wall and between the drilling tool and a metal casing, preventing a bit from being balled, and further achieving the purposes of improving drilling speed, preventing drilling sticking and slowing down abrasion of the drilling tool. Drilling fluid lubricants in the prior art are largely divided 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 lamellar structures, and provides lubrication by separating two friction interfaces and converting a friction mode between the two interfaces, but the solid lubricant is easy to agglomerate in water-based drilling fluid and is screened out by a vibrating screen, so that the application of the solid lubricant is limited. The liquid lubricant mainly comprises refined mineral oil, poly alpha-olefin, vegetable oil, modified vegetable oil, synthetic fatty acid ester and the like. Among the conventional liquid lubricants, fatty acid esters have the best lubricating effect, but have some problems. On one hand, the hydrophilic property is poor, and negative electricity is generated after hydrolysis, so that the adsorption quantity on the surfaces of a negatively charged drilling tool and a well wall is small and the adsorption is weak; on the other hand, the lubrication film formed by the fatty acid ester mainly depends on the closely arranged long hydrophobic chains to bear pressure and reduce friction coefficient, but the friction resistance between the hydrophobic alkyl chains cannot be ignored, so that friction and drag reduction cannot be reduced to the greatest extent. Some documents report that biological joint synovial fluid can achieve extremely efficient lubricating performance through hydration lubrication, and even can achieve ultra-low friction coefficient. The decisive role in joint synovial fluid is lubricin. 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 friction between metals can be converted into the friction between water molecules through hydration, so that the lubricating effect is very high.
Chinese patent application 201910256499.5 discloses an amphiphilic bottle brush polymer, a preparation method of the amphiphilic bottle brush polymer and a drilling fluid additive and application thereof. The additive for the drilling fluid comprises an amphiphilic bottle brush type polymer, carboxymethyl chitosan, long-chain fatty alcohol and water, and can remarkably reduce the friction coefficient of the water-based drilling fluid.
Chinese patent application 201810854349.X discloses a drilling fluid bionic lubricant, and preparation method and application thereof; the drilling fluid bionic lubricant comprises the following components in parts by weight: 100 parts of water, 2-15 parts of bottle brush type polymer, 1-5 parts of sodium alginate and 1-10 parts of long-chain fatty alcohol, wherein the bottle brush type polymer is polylysine-graft-polyethylene glycol copolymer; the polylysine-graft-polyethylene glycol copolymer comprises the following components in structure: (i) A polylysine backbone having a number average molecular weight ranging from 20kDa to 300kDa; (ii) And the number average molecular weight of the polyethylene glycol brush section ranges from 1kDa to 20kDa.
The brush type polymer drilling fluid lubricant has good application prospect, and the research on the brush type polymer drilling fluid lubricant is less at present.
Disclosure of Invention
The invention aims to provide a drilling fluid hydration type lubricant, a preparation method and application thereof, and the lubricant can be firmly adsorbed on the surface of a drilling tool and can hydrate and lubricate the friction surface. The inventor of the invention unexpectedly discovers that the molecular chain of chitosan is relatively stronger in rigidity and is not easy to curl in water, and if the chitosan is used as a molecular framework to graft polyethylene glycol, a better lubricating effect can be obtained, the adsorptivity on electronegative friction surfaces such as metals is stronger, and a firmer hydration lubricating film can be provided. Meanwhile, when the chitosan-graft-polyethylene glycol copolymer and carboxymethyl chitosan are used together, a synergistic effect exists, so that the lubrication effect can be greatly improved, and the cost is reduced.
In order to achieve the above object, the present invention has the following technical scheme:
in one aspect, the invention provides a drilling fluid hydration lubricant comprising the following components in parts by weight: 90-110 parts of water, 2-12 parts of chitosan-graft-polyethylene glycol copolymer and 0.2-2 parts of carboxymethyl chitosan.
Preferably, the composition comprises the following components in parts by weight: 95-105 parts of water, 3-8 parts of chitosan-graft-polyethylene glycol copolymer and 0.5-1 part of carboxymethyl chitosan; further preferably, the composition comprises the following components in parts by weight: 100 parts of water, 4-6 parts of chitosan-graft-polyethylene glycol copolymer and 0.6-0.8 part of carboxymethyl chitosan.
Preferably, the water is selected from deionized and/or distilled water.
Wherein the chitosan-graft-polyethylene glycol copolymer structure comprises a chitosan main chain and a polyethylene glycol (PEG) brush section.
Preferably, the number average molecular weight of the chitosan main chain ranges from 20kDa to 200kDa, and the number average molecular weight of the polyethylene glycol brush segment ranges from 1kDa to 10kDa;
further preferably, the number average molecular weight of the chitosan main chain ranges from 50kDa to 150kDa, and the number average molecular weight of the polyethylene glycol brush segment ranges from 2kDa to 8kDa;
most preferably, the chitosan backbone has a number average molecular weight in the range of 70kDa to 100kDa and the polyethylene glycol brush segment has a number average molecular weight in the range of 5kDa to 6kDa.
The length and the grafting density of the PEG chain have great influence on the lubrication effect, the chain length and the grafting density of the PEG are increased, the friction force is reduced, and the lubrication effect is improved. In addition, during rubbing, the polymer may electrostatically adsorb to the abraded surface, acting as a self-healing.
Preferably, the preparation method of the chitosan-graft-polyethylene glycol copolymer comprises the following steps:
(1) Dissolving methoxy polyethylene glycol carboxyl (mPEG-COOH) in a buffer solution, then adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride (EDC.HCl) with twice the equivalent of carboxyl, then adding N-hydroxysuccinimide (NHS) with twice the equivalent of carboxyl, then adding an acid solution of chitosan dropwise, and reacting to obtain a product solution;
(2) And drying the product solution to obtain the chitosan-graft-polyethylene glycol copolymer.
Further preferably, the preparation method of the chitosan-graft-polyethylene glycol copolymer specifically comprises the following steps:
(1) Dissolving chitosan in 0.1mol/L hydrochloric acid solution;
(2) Dissolving methoxy polyethylene glycol carboxyl (mPEG-COOH) in 50mmol/L sodium bromide buffer solution, then adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride (EDC.HCl) with twice the equivalent of carboxyl into the solution, stirring for 8-12min, adding N-hydroxysuccinimide (NHS) with twice the equivalent of carboxyl, continuously stirring for 15-250min, dropwise adding the chitosan acid solution prepared in the step (1), and continuously stirring at room temperature for 20-28h to obtain a product solution;
(3) And (3) drying and crushing the product solution obtained in the step (2) at 100-110 ℃ to obtain the chitosan-graft-polyethylene glycol copolymer.
Wherein the weight ratio of the chitosan to the methoxy polyethylene glycol carboxyl is 1:3-10, preferably 1:6-8. The ratio range is set in consideration of the above-mentioned graft density.
Preferably, the carboxymethyl chitosan has a number average molecular weight of 2kDa to 20kDa, more preferably 5kDa to 10kDa.
The carboxymethyl chitosan has the function of simulating hyaluronic acid in joint synovial fluid, and can be directly adsorbed on the friction surface to serve as a boundary lubricant to strengthen the lubrication function; on the other hand, the chitosan-graft-polyethylene glycol copolymer can be assembled on a carboxymethyl chitosan molecular chain through hydrophobic interaction to form a brush type assembly body with a secondary structure and taking carboxymethyl chitosan as a main chain and the chitosan-graft-polyethylene glycol copolymer as a side chain, so that the hydration lubrication effect is further improved.
On the other hand, the invention also provides a preparation method of the drilling fluid hydration type lubricant, which comprises the following steps:
adding the water into a reaction kettle, heating to 40-60 ℃, and sequentially adding the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydration lubricant.
Preferably, the temperature of the elevated temperature is 50 ℃.
Preferably, the two are completely dissolved in water by stirring for 0.5-1 h.
Finally, the invention provides application of the drilling fluid hydration lubricant or the drilling fluid hydration lubricant prepared by the preparation method in drilling fluid.
The beneficial effects of the invention are as follows:
(1) The core component in the lubricant is a polymer chitosan-graft-polyethylene glycol copolymer with a bottle brush structure, and the polymer can firmly adsorb water molecules, so that friction between metals or rocks can be converted into friction between water molecules after being adsorbed on a friction surface, and friction resistance is greatly reduced;
(2) Other components of the lubricant of the present invention include carboxymethyl chitosan. The carboxymethyl chitosan has the function of simulating hyaluronic acid in joint synovial fluid, and can be directly adsorbed on the friction surface to serve as a boundary lubricant to strengthen the lubrication function; on the other hand, the chitosan-graft-polyethylene glycol copolymer can be assembled on a carboxymethyl chitosan molecular chain through hydrophobic interaction to form a brush type assembly body with a secondary structure and taking carboxymethyl chitosan as a main chain and the chitosan-graft-polyethylene glycol copolymer as a side chain, so that the hydration lubrication effect is further improved;
(3) The main advantage of the lubricant of the invention is the synergistic effect between the components, namely the synergistic effect between the bottle brush type polymer chitosan-graft-polyethylene glycol copolymer and carboxymethyl chitosan, which is also the main reason for the efficient lubrication effect of biological lubricants. The preparation cost of the whole lubricant is far lower than that of a chitosan-graft-polyethylene glycol copolymer singly, but the effect is better.
Detailed Description
In order to make the technical means, the creation features, the achievement of the purpose and the effect of the present invention easy to understand, the present invention will be further elucidated with reference to the specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention. In the examples described below, unless otherwise specified, the methods of operation used were conventional, the equipment used was conventional, and the materials used were commercially available.
The chitosan was purchased from sigma aldrich (Shanghai) trade company, under the number 448869.
The methoxy polyethylene glycol carboxyl group is purchased from the Biotechnology Co., ltd., , germany, and the product numbers are PS1-CM-1k, PS1-CM-2k, PS1-CM-5k and PS1-CM-10k.
The 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was purchased from sigma aldrich (Shanghai) trade company under the trade designation 341006.
The N-hydroxysuccinimide was purchased from Sigma Aldrich trade Co., ltd under the trade designation 8.04518.
The carboxymethyl chitosan was purchased from carboxymethyl chitosan under the product number C804727.
Example 1
2g of chitosan (weight average molecular weight 50 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 6g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 1 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 2.29g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 1.39. 1.39g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃,0.2 g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 2g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A1 is obtained.
Example 2
2g of chitosan (weight average molecular weight 20 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 20g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 1 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 7.64g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then adding 4.6. 4.6g N-hydroxysuccinimide. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 0.5g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 2g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A2 is obtained.
Example 3
2g of chitosan (weight average molecular weight 50 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 12g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 1 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and 4.58g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was then added to the solution, followed by stirring for 10 minutes and then adding 2.76, g N-hydroxysuccinimide. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃,0.2 g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 2g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A3 is obtained.
Example 4
2g of chitosan (weight average molecular weight 200 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 12g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 1 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and 4.58g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was then added to the solution, followed by stirring for 10 minutes and then adding 2.76, g N-hydroxysuccinimide. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 1g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 2g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A4 is obtained.
Example 5
2g of chitosan (weight average molecular weight 150 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 20g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 10 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 0.76g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 0.46. 0.46g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 0.6g of carboxymethyl chitosan (weight average molecular weight 5 kDa) and 3g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A5 is obtained.
Example 6
2g of chitosan (weight average molecular weight 75 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 12g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 5 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 0.91g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 0.72. 0.72g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 0.8g of carboxymethyl chitosan (weight average molecular weight 10 kDa) and 8g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 0.5h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A6 is obtained.
Example 7
2g of chitosan (weight average molecular weight 75 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 12g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 5 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 0.91g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 0.72. 0.72g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 2g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 12g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 1h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A7 is obtained.
Example 8
2g of chitosan (weight average molecular weight 75 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 16g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 5 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 0.91g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 0.72-g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃, 1g of carboxymethyl chitosan (weight average molecular weight 2 kDa) and 6g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 1h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A8 is obtained.
Example 9
2g of chitosan (weight average molecular weight 75 kDa) was dissolved in 50mL of 0.1mol/L hydrochloric acid solution. 12g of methoxypolyethylene glycol carboxyl group (weight average molecular weight 5 kDa) was dissolved in 40mL of 50mmol/L sodium bromide buffer solution, and then 0.91g of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was added to the solution, followed by stirring for 10 minutes and then 0.72. 0.72g N-hydroxysuccinimide was added. After stirring for 20min, the chitosan solution was added dropwise, and stirring was continued at room temperature for 24 h. And then drying the product solution at 105 ℃ and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
100g of water is added into a three-neck flask with a stirrer and a thermometer, the temperature is raised to 50 ℃,0.2 g of carboxymethyl chitosan (weight average molecular weight 20 kDa) and 6g of chitosan-graft-polyethylene glycol copolymer are sequentially added under the stirring condition, and stirring is carried out for 1h, so that the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer are completely dissolved in the water, and the drilling fluid hydration lubricant A9 is obtained.
Comparative example 1
Pentaerythritol ricinoleate (prepared according to the method described in the literature on the synthesis and the study of properties of pentaerythritol ricinoleate) was used as a comparative lubricant B1 for comparison of lubricating properties with the products of the examples.
Comparative example 2
Unlike example 8, comparative example 2 was prepared without adding carboxymethyl chitosan, and the remainder was the same, to obtain the drilling fluid hydration type lubricant B2.
Comparative example 3
Unlike example 8, comparative example 3 was not added with chitosan-graft-polyethylene glycol copolymer, and the rest was the same, to obtain the drilling fluid hydration type lubricant B3.
Performance testing
Test examples extreme pressure lubrication coefficients were tested using a fann21200 extreme pressure lubrication instrument, operating as follows:
firstly, checking the machine by purified water, wherein the torque reading is 0 when the machine is not pressurized, and the rotating speed is 60 revolutions per minute; when pressurized at 150inch pounds (inch-points), the rotational speed remains 60rpm; after that, the operation was performed for 5 minutes with pressurization to 150 inch-points, and the torque reading of purified water was tested, ensuring that the torque reading of purified water was between 28 and 42. The purified water was changed to the slurry to be tested and run for 5 minutes under pressure of 150 inch-counts and a torque reading of the slurry tested was taken. The machine was calibrated with purified water before each slurry torque test.
Extreme pressure lubrication coefficient calculation formula:
extreme pressure lubrication coefficient = M-sample x (34/M water) x 100%,
wherein:
m sample: extreme pressure torque readings of the sample;
m water: extreme pressure torque reading of purified water.
In the above test, the test samples were prepared by mixing the drilling fluid base slurry with the lubricants prepared in the above examples 1 to 9 (A1 to A9) and comparative examples 1 to 3 (B1 to B3), respectively: drilling fluid base slurry composition: 5wt% of Xia Zijie sodium bentonite, 0.2wt% of anhydrous sodium carbonate and the balance of water, and hydrating for 24 hours at room temperature; the amount of the example lubricant and the comparative lubricant added to the base stock was 3wt%.
The measurement results are shown in table 1.
Table 1.
As can be seen from the data in Table 1, the extreme pressure lubrication coefficients of the drilling fluids adopting the hydration lubricants A1-A9 of the invention are 0.021-0.045, which shows that the drilling fluids have good lubricity and can effectively reduce downhole friction and torque; the extreme pressure lubrication coefficient of the drilling fluid B1 adopting the traditional ester lubricant is higher and reaches 0.068, which proves that the lubricant has relatively better performance. B2 and B3 prove that the lubricating performance is improved after the chitosan-graft-polyethylene glycol copolymer and carboxymethyl chitosan form a bottle brush-shaped structure, and the chitosan-graft-polyethylene glycol copolymer and carboxymethyl chitosan are indispensable.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The drilling fluid hydration type lubricant is characterized by comprising the following components in parts by weight: 90-110 parts of water, 2-12 parts of chitosan-graft-polyethylene glycol copolymer and 0.2-2 parts of carboxymethyl chitosan;
the carboxymethyl chitosan has a number average molecular weight of 2kDa-20kDa, and the chitosan-graft-polyethylene glycol copolymer structure comprises a chitosan main chain and a polyethylene glycol brush section; the number average molecular weight of the chitosan main chain ranges from 20kDa to 200kDa, and the number average molecular weight of the polyethylene glycol brush segment ranges from 1kDa to 10kDa;
the chitosan-graft-polyethylene glycol copolymer is prepared by the following method:
(1) Dissolving methoxy polyethylene glycol carboxyl into a buffer solution, adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride with twice the equivalent of carboxyl, adding N-hydroxysuccinimide with twice the equivalent of carboxyl, and then dropwise adding an acid solution of chitosan to react to obtain a product solution;
(2) Drying the product solution to obtain the chitosan-graft-polyethylene glycol copolymer;
wherein the weight ratio of the chitosan to the methoxy polyethylene glycol carboxyl is 1:3-10.
2. The drilling fluid hydrating lubricant according to claim 1, comprising the following components in parts by weight: 95-105 parts of water, 3-8 parts of chitosan-graft-polyethylene glycol copolymer and 0.5-1 part of carboxymethyl chitosan.
3. The drilling fluid hydration lubricant of claim 2, comprising the following components in parts by weight: 100 parts of water, 4-6 parts of chitosan-graft-polyethylene glycol copolymer and 0.6-0.8 part of carboxymethyl chitosan.
4. The drilling fluid hydrating lubricant according to claim 1, wherein the carboxymethyl chitosan has a number average molecular weight of 5kDa to 10kDa, the chitosan backbone has a number average molecular weight in the range of 50kDa to 150kDa, and the polyethylene glycol brush segment has a number average molecular weight in the range of 2kDa to 8kDa.
5. The drilling fluid hydrating lubricant according to claim 1, wherein the chitosan backbone has a number average molecular weight in the range of 70kDa to 100kDa and the polyethylene glycol brush segment has a number average molecular weight in the range of 5kDa to 6kDa.
6. The drilling fluid hydrating lubricant according to claim 1, wherein the weight ratio of chitosan to methoxypolyethylene glycol carboxyl groups is 1:6-8.
7. A method of preparing a drilling fluid hydration lubricant according to any one of claims 1-6, comprising the steps of:
adding the water into a reaction kettle, heating to 40-60 ℃, and sequentially adding the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydration lubricant.
8. Use of the drilling fluid hydration lubricant of any one of claims 1-6 or the drilling fluid hydration lubricant prepared by the method of preparation of claim 7 in a drilling fluid.
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| CN108998074A (en) * | 2018-07-20 | 2018-12-14 | 武汉工程大学 | A kind of alkylation carboxyalkyl chitosan quasi-oil demulsifier and preparation method thereof of poly glycol monomethyl ether grafting |
| CN110522953A (en) * | 2018-05-24 | 2019-12-03 | 中国科学院兰州化学物理研究所 | A kind of bionic joint lubricant and preparation method thereof |
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| AU2003247342A1 (en) * | 2002-04-16 | 2003-11-03 | Eidgenossisch Technische Hochschule Zurich | Environmentally compatible additives for aqueous lubricants |
| US8043999B2 (en) * | 2007-07-17 | 2011-10-25 | Schlumberger Technology Corporation | Stabilizing biphasic concentrates through the addition of small amounts of high molecular weight polyelectrolytes |
| CN104870020A (en) * | 2012-10-19 | 2015-08-26 | 康奈尔大学 | Biomimetic boundary lubricants for articular cartilage |
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| CN110776881B (en) * | 2018-07-30 | 2021-11-26 | 中国石油化工股份有限公司 | Bionic lubricant for drilling fluid and preparation method and application thereof |
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| CN110522953A (en) * | 2018-05-24 | 2019-12-03 | 中国科学院兰州化学物理研究所 | A kind of bionic joint lubricant and preparation method thereof |
| CN108998074A (en) * | 2018-07-20 | 2018-12-14 | 武汉工程大学 | A kind of alkylation carboxyalkyl chitosan quasi-oil demulsifier and preparation method thereof of poly glycol monomethyl ether grafting |
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