CN114621735A - 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 oil field drilling fluids. The invention relates to a drilling fluid hydration type lubricant which 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 in the water to obtain the chitosan-graft-polyethylene glycol copolymer. The lubricant can be firmly adsorbed on the surface of a drilling tool and hydrate and lubricate the friction surface, has stronger adsorbability on electronegative friction surfaces such as metal and the like, and can provide a firmer hydrated and lubricated film. Meanwhile, the chitosan-graft-polyethylene glycol copolymer and the carboxymethyl chitosan are jointly used to have a synergistic effect, so that the lubricating effect can be greatly improved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of oil field drilling fluid, and particularly relates to a drilling fluid hydration type 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, and meanwhile, the safety of drilling operation is threatened, so that the core problem of restricting the extension length of the horizontal section of the deep horizontal well is solved, and higher requirements are 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 the 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. Fatty acid esters are the most effective lubricants in conventional liquid lubricants, but they also have some problems. On one hand, the drilling tool with negative electricity and the well wall surface have small adsorption amount and are not firmly adsorbed due to poor hydrophilicity and negative electricity after hydrolysis; on the other hand, a lubricating film formed by the fatty acid ester mainly depends on the closely arranged long hydrophobic chains to bear pressure and reduce the friction coefficient, but the friction resistance between the hydrophobic alkyl chains is not ignored, so that the friction resistance cannot be reduced to the maximum extent. Some documents report that the synovial fluid of organism joints can achieve extremely high-efficiency lubricating performance through hydration lubrication, and even can achieve ultra-low friction coefficient. A 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 lubricin has extremely high-efficiency lubrication effect.
Chinese patent application 201910256499.5 discloses an amphiphilic bottle brush type polymer, a preparation method of the amphiphilic bottle brush type polymer, a drilling fluid additive and application thereof, wherein the amphiphilic bottle brush type polymer comprises a polyvinyl alcohol main chain, a polyphenylene ether side chain brush segment and a polyethylene glycol side chain brush segment. 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 bionic lubricant for drilling fluid and 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, wherein the bottle brush type polymer is a 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 number average molecular weight of the polyethylene glycol brush section is 1kDa-20 kDa.
The brush type polymer drilling fluid lubricant has good application prospect, and the research aiming at 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, wherein the lubricant can be firmly adsorbed on the surface of a drilling tool and can hydrate and lubricate a friction surface. The inventor of the invention unexpectedly finds that the chitosan molecular chain has relatively stronger rigidity and is not easy to curl in water, if the chitosan is used as the molecular framework to graft polyethylene glycol, the chitosan can obtain more excellent lubricating effect, and the chitosan has stronger adsorbability on electronegative friction surfaces of metal and the like, and can provide a firmer hydrated lubricating film. Meanwhile, when the chitosan-graft-polyethylene glycol copolymer and the carboxymethyl chitosan are used together, a synergistic effect exists, so that the lubricating effect can be greatly improved, and the cost is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in one aspect, the invention provides a drilling fluid water-based lubricant, which 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.
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 water and/or distilled water.
Wherein, the chitosan-graft-polyethylene glycol copolymer structure comprises a chitosan main chain and a polyethylene glycol (PEG) brush segment.
Preferably, the number average molecular weight of the chitosan backbone ranges from 20kDa to 200kDa, and the number average molecular weight of the polyethylene glycol brush segment ranges from 1kDa to 10 kDa;
further preferably, the number average molecular weight of the chitosan backbone ranges from 50kDa to 150kDa, and the number average molecular weight of the polyethylene glycol brush segments ranges from 2kDa to 8 kDa;
most preferably, the number average molecular weight of the chitosan backbone is in the range of 70kDa to 100kDa, and the number average molecular weight of the polyethylene glycol brush segments is in the range of 5kDa to 6 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.
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 equivalent of carboxyl, then adding N-hydroxysuccinimide (NHS) with twice equivalent of carboxyl, then dropwise adding an acid solution of chitosan, 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 methoxypolyethylene glycol carboxyl (mPEG-COOH) in 50mmol/L sodium bromide buffer solution, then adding 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride (EDC.HCl) with the equivalent of twice carboxyl into the solution, stirring for 8-12min, then adding N-hydroxysuccinimide (NHS) with the equivalent of twice carboxyl, continuously stirring for 15-250min, then dropwise adding the chitosan acid solution prepared in the step (1), and continuously stirring at room temperature for 20-28h for reaction to obtain a product solution;
(3) and (3) drying and crushing the product solution obtained in the step (2) at the temperature of 100-110 ℃ to obtain the chitosan-graft-polyethylene glycol copolymer.
Wherein the weight ratio of the chitosan to the methoxypolyethylene glycol carboxyl is 1: 3-10, preferably 1: 6-8. This ratio range is set in consideration of the above graft density.
Preferably, the carboxymethyl chitosan has a number average molecular weight of 2kDa to 20kDa, and more preferably 5kDa to 10 kDa.
The carboxymethyl chitosan 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 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, wherein the carboxymethyl chitosan is used as a main chain, and the chitosan-graft-polyethylene glycol copolymer is used as a side chain, so that the hydration lubrication effect is further improved.
In another aspect, the present invention further provides a method for preparing the above-mentioned drilling fluid water-type lubricant, comprising the steps of:
and 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 in the water to obtain the well drilling fluid hydration type lubricant.
Preferably, the temperature of the temperature rise is 50 ℃.
Preferably, the two are completely dissolved in the water by stirring for 0.5h-1 h.
Finally, the invention provides the application of the drilling fluid hydration type lubricant or the drilling fluid hydration type lubricant prepared by the preparation method in the drilling fluid.
The invention has the beneficial effects that:
(1) the core component in the lubricant is a polymer chitosan-graft-polyethylene glycol copolymer with a bottle brush-shaped structure, the polymer can firmly adsorb water molecules, and the friction between metals or rocks can be converted into the friction between water molecules after the polymer is adsorbed on a friction surface, so that the friction resistance is greatly reduced;
(2) other components of the lubricant of the present invention include carboxymethyl chitosan. The carboxymethyl chitosan 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 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, wherein the carboxymethyl chitosan is used as a main chain, and the chitosan-graft-polyethylene glycol copolymer is used as a side chain, so that the hydration lubrication effect is further improved;
(3) the main advantage of the lubricant of the invention lies in the synergistic effect between the components, namely the synergistic effect between the bottle brush type polymer chitosan-graft-polyethylene glycol copolymer and the carboxymethyl chitosan, which is also the main reason of the high-efficiency lubricating effect of the biological lubricant. And the preparation cost of the whole lubricant is far lower than that of the single chitosan-graft-polyethylene glycol copolymer, but the effect is better.
Detailed Description
The present invention will be further explained with reference to specific examples in order to make the technical means, the technical features, the technical objectives and the effects of the present invention easier to understand, but the following examples are only preferred embodiments of the present invention, and not all embodiments of the present invention. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. In the following examples, unless otherwise specified, all the procedures used were conventional, all the equipment used were conventional, and all the starting materials used were commercially available.
The chitosan was purchased from sigma aldrich (shanghai) trade ltd, having a product number of 448869.
The methoxypolyethylene glycol carboxyl is purchased from Peng Shuo Biotech Co., Ltd, Germany, and has the product numbers of PS1-CM-1k, PS1-CM-2k, PS1-CM-5k and PS1-CM-10 k.
The 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride was purchased from sigma aldrich trade ltd under the trade designation 341006.
The N-hydroxysuccinimide is available from Sigma Aldrich trade, Inc. under the trade designation 8.04518.
The carboxymethyl chitosan is purchased from carboxymethyl chitosan, and the commodity number is C804727.
Example 1
2g of chitosan (weight average molecular weight 50kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 6g methoxy polyethylene glycol carboxyl (weight average molecular weight 1kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution added 2.29g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min after adding 1.39g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.2g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 2g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A1.
Example 2
2g of chitosan (weight average molecular weight 20kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 20g of methoxypolyethylene glycol carboxyl (weight average molecular weight 1kDa) 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, and after stirring for 10min, 4.6g N-hydroxysuccinimide was added. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.5g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 2g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A2.
Example 3
2g of chitosan (weight average molecular weight 50kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 12g methoxy polyethylene glycol carboxyl (weight average molecular weight 1kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution added 4.58g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min after adding 2.76g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.2g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 2g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A3.
Example 4
2g of chitosan (weight average molecular weight 200kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 12g methoxy polyethylene glycol carboxyl (weight average molecular weight 1kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution added 4.58g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min after adding 2.76g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 1g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 2g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydration type lubricant A4.
Example 5
2g of chitosan (weight average molecular weight 150kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 20g methoxy polyethylene glycol carboxyl (weight average molecular weight 10kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution is added 0.76g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min after adding 0.46g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.6g of carboxymethyl chitosan (weight average molecular weight is 5kDa) and 3g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A5.
Example 6
2g of chitosan (weight average molecular weight of 75kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 12g methoxy polyethylene glycol carboxyl (weight average molecular weight 5kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution is added 0.91g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min, then added 0.72g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.8g of carboxymethyl chitosan (weight average molecular weight is 10kDa) and 8g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 0.5h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A6.
Example 7
2g of chitosan (weight average molecular weight of 75kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 12g methoxy polyethylene glycol carboxyl (weight average molecular weight 5kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution is added 0.91g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min, then added 0.72g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 2g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 12g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 1h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A7.
Example 8
2g of chitosan (weight average molecular weight of 75kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 16g methoxy polyethylene glycol carboxyl (weight average molecular weight 5kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution is added 0.91g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min, then added 0.72g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 1g of carboxymethyl chitosan (weight average molecular weight is 2kDa) and 6g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 1h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydrated type lubricant A8.
Example 9
2g of chitosan (weight average molecular weight of 75kDa) was dissolved in 50mL of a 0.1mol/L hydrochloric acid solution. 12g methoxy polyethylene glycol carboxyl (weight average molecular weight 5kDa) dissolved in 40mL 50mmol/L sodium bromide buffer solution, then to the solution is added 0.91g 1-ethyl- (3-two methyl amino propyl) carbonyl two imine hydrochloride, stirring for 10min, then added 0.72g N-hydroxy succinimide. Stirring is continued for 20min, then the chitosan solution is added drop by drop, and stirring is continued for 24h reaction at room temperature. And then drying the product solution at 105 ℃, and crushing to obtain the chitosan-graft-polyethylene glycol copolymer.
Adding 100g of water into a three-neck flask with a stirrer and a thermometer, heating to 50 ℃, sequentially adding 0.2g of carboxymethyl chitosan (with the weight average molecular weight of 20kDa) and 6g of chitosan-graft-polyethylene glycol copolymer under the condition of stirring, and stirring for 1h to completely dissolve the carboxymethyl chitosan and the chitosan-graft-polyethylene glycol copolymer in the water to obtain the drilling fluid hydration type lubricant A9.
Comparative example 1
Pentaerythritol ricinoleate (prepared according to the method described in the literature "synthesis and performance studies of pentaerythritol ricinoleate") was used as comparative lubricant B1 for lubrication performance comparison with the products of the examples.
Comparative example 2
Unlike example 8, comparative example 2, in which carboxymethyl chitosan was not added, was identical to the rest, to obtain the drilling fluid hydrated type lubricant B2.
Comparative example 3
Unlike example 8, in comparative example 3, in which the chitosan-graft-polyethylene glycol copolymer was not added, the same was true, and the drilling fluid hydrated type lubricant B3 was obtained.
Performance test
The test example adopts a fann 212000 type extreme pressure lubrication instrument to test the extreme pressure lubrication coefficient, and 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); thereafter, the purified water was run under pressure of 150 inch-points for 5min and tested for torque readings, ensuring that the torque readings of the purified water were between 28-42. 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 (M sample x (34/M water) × 100%,
in the formula:
and (5) M sample: an extreme pressure torque reading of the sample;
m, water: extreme pressure torque readings of purified water.
In the above tests, the test samples were drilling fluid-based slurries mixed with lubricants prepared from examples 1-9(A1-A9) and comparative examples 1-3(B1-B3) above, 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.
As can be seen from the data in Table 1, the extreme pressure lubrication coefficient of the drilling fluid adopting the hydrated lubricant A1-A9 is 0.021-0.045, which shows that the drilling fluid has good lubricity and can effectively reduce downhole friction resistance and torque; the extreme pressure lubrication coefficient of the drilling fluid B1 adopting the traditional ester lubricant is higher and reaches 0.068, which shows that the lubricant has relatively better performance. B2 and B3 prove that the lubricating property is improved after the chitosan-graft-polyethylene glycol copolymer and the carboxymethyl chitosan form a bottle brush-shaped structure, and the two are not necessary.
The present invention is not limited to the above-described preferred embodiments, but rather, the present invention is to be construed broadly and cover all modifications, equivalents, and improvements falling within the spirit and scope of the present invention.
Claims (10)
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.
2. The drilling fluid hydration lubricant of 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 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 hydrated lubricant of claim 1 wherein the carboxymethyl chitosan has a number average molecular weight of 2kDa to 20kDa, and the chitosan-graft-polyethylene glycol copolymer structure comprises a chitosan backbone and polyethylene glycol brush segments; the number average molecular weight range of the chitosan main chain is 20kDa-200kDa, and the number average molecular weight range of the polyethylene glycol brush segment is 1kDa-10 kDa.
5. The drilling fluid-hydrating lubricant of claim 4, 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 segments have a number average molecular weight in the range of 2kDa to 8 kDa.
6. The drilling fluid hydrated lubricant of claim 5, wherein the chitosan backbone has a number average molecular weight in the range of 70kDa to 100kDa, and the polyethylene glycol brush segments have a number average molecular weight in the range of 5kDa to 6 kDa.
7. The drilling fluid aqueous lubricant of any one of claims 1-6, wherein 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 the equivalent of twice carboxyl, adding N-hydroxysuccinimide with the equivalent of twice carboxyl, dropwise adding an acid solution of chitosan, and reacting 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 methoxypolyethylene glycol carboxyl is 1: 3-10.
8. The drilling fluid aqueous lubricant of claim 7, wherein the weight ratio of chitosan to methoxypolyethylene glycol carboxyl groups is 1: 6-8.
9. The method of preparing a drilling fluid hydration lubricant as set forth in any one of claims 1-8, comprising the steps of:
and 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 in the water to obtain the drilling fluid water-based lubricant.
10. Use of a drilling fluid hydratable lubricant according to any of claims 1 to 8 or prepared by the process of claim 9 in a drilling fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011472367.5A CN114621735B (en) | 2020-12-14 | 2020-12-14 | Drilling fluid hydration type lubricant and preparation method and application thereof |
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| CN202011472367.5A CN114621735B (en) | 2020-12-14 | 2020-12-14 | Drilling fluid hydration type lubricant and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN114621735A true CN114621735A (en) | 2022-06-14 |
| CN114621735B CN114621735B (en) | 2023-05-30 |
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| CN118344855A (en) * | 2024-06-17 | 2024-07-16 | 纯牌科技股份有限公司 | Low-conductivity corrosion inhibition cooling liquid and preparation method thereof |
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