Lubricant additive and preparation method thereof, lubricant, water-based drilling fluid and preparation method thereof

Abstract

The present invention relates to the technical field of oil drilling fluid, and in particular to a lubricant additive and preparation method, lubricant, water-based drilling fluid and preparation method, the lubricant additive comprises the following raw materials: 6 parts of taurine, 30-60 parts of 1-bromohexadecane, 8.5-15 parts of potassium hydroxide, 0.5-0.9 parts of potassium iodide, 30-60 parts of thionyl chloride, 2-4 parts of N,N-dimethylformamide, 7-17 parts of ammonia water and 30 parts of chloroform, the lubricant additive uses sulfonic acid amine group as active adsorption group, and can be stably adsorbed on drill string, casing and mud cake. At the same time, it has two C16 flexible chains, can form a dense lubricating film, and efficiently reduce friction resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum drilling fluid, and in particular to a lubricant additive and a preparation method thereof, a lubricant, a water-based drilling fluid and a preparation method thereof. Background Art

[0002] With the continuous consumption of fossil fuels, conventional oil and gas fields are becoming increasingly depleted, the exploitation of complex oil and gas fields is gradually increasing, the drilling methods are constantly innovating, and complex well sections such as ultra-deep wells and large-displacement horizontal wells are increasing. However, in the process of using complex well sections such as large-displacement horizontal wells for oil and gas exploration and development, the drilling friction coefficient increases by hundreds or thousands of times, which can easily cause complex underground accidents such as drill sticking and well collapse. At the same time, the high torque caused by high friction greatly consumes energy, causing the drilling cost to continue to increase.

[0003] Adding lubricants to drilling fluid can effectively improve the lubrication properties of drilling fluid, reduce the occurrence of complex downhole accidents such as drill sticking and well collapse, and at the same time improve drilling efficiency and reduce drilling costs. At present, there are about 180 kinds of commercial water-based drilling fluid lubricants at home and abroad, accounting for 6% of the total use of water-based drilling fluid treatment agents. Among them, liquid lubricants can form a lubricating oil film between the drill tool and the casing, and between the drill tool and the well wall, so that the direct contact area between the drill tool and the casing or the well wall is reduced, and the friction coefficient is reduced. However, under high temperature and high load conditions underground, the oil film (lubricating film) formed by most commercial liquid lubricants is easily destroyed, resulting in lubrication failure and a sharp increase in the friction coefficient. Summary of the invention

[0004] In order to solve the above technical problems, embodiments of the present invention provide a lubricant additive and a preparation method thereof, a lubricant, a water-based drilling fluid and a preparation method thereof.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] On the one hand, the present invention provides a lubricant additive, which includes the following raw materials, measured in parts by weight: 6 parts of taurine, 30-60 parts of 1-bromohexadecane, 8.5-15 parts of potassium hydroxide, 0.5-0.9 parts of potassium iodide, 30-60 parts of dichlorothionyl, 2-4 parts of N,N-dimethylformamide, 7-17 parts of ammonia water and 30 parts of chloroform.

[0007] The present invention also provides a method for preparing a lubricant additive, comprising the following steps:

[0008] A. Take 6 parts of taurine, 30-60 parts of 1-bromohexadecane, 8.5-15 parts of potassium hydroxide, 0.5-0.9 parts of potassium iodide, 30-60 parts of thionyl chloride, 2-4 parts of N,N-dimethylformamide, 7-17 parts of ammonia water, and 30 parts of chloroform for later use;

[0009] B. Prepare taurine, potassium hydroxide, potassium iodide and a solvent into a mixture A, dissolve 1-bromohexadecane into liquid B, add liquid B dropwise into the mixture A and reflux to obtain a mixture C, remove the solvent to obtain a crude intermediate product D-1, and then wash and purify to obtain an intermediate D-2;

[0010] C. Mix the intermediate D-2, thionyl chloride and N,N-dimethylformamide and stir to react, and remove the excess thionyl chloride after the reaction to obtain the intermediate E;

[0011] D. Add chloroform and aqueous ammonia to the intermediate E and stir to react, and obtain product F after washing.

[0012] The chemical structural formula of the product F of the present invention is: ;

[0013] The present invention uses taurine to react with 1-bromohexadecane under the conditions of KI as a catalyst and KOH as an acid-binding agent to obtain product D-2. Substance D-2 undergoes sulfonylation reaction with SOCl2 under the conditions of N,N-dimethyl as a catalyst and an acid-binding agent to obtain intermediate E, and intermediate E reacts with ammonia gas in ammonia water to generate final product F. The specific reaction equation of the preparation method of the lubricant additive is as follows:

[0014]

[0015] In some embodiments, in step B, the reflux temperature is 50-60° C., and the reflux time is 12-24 hours.

[0016] In some embodiments, in step C, the reaction temperature is 20°C, and in step D, the reaction temperature is 0°C.

[0017] The present invention also provides a lubricant, comprising the following raw materials, in parts by weight: 80-100 parts of base oil, 8-10 parts of surfactant and 20-30 parts of lubricant additive, wherein the lubricant additive is the above lubricant additive or the lubricant additive prepared by the above preparation method.

[0018] In some embodiments, the base oil includes at least one of polyalphaolefin, white oil, and epoxidized soybean oil.

[0019] In some embodiments, the HBL value of the surfactant is 13-15.

[0020] In some embodiments, the surfactant includes at least one of sorbitan trioleate, sorbitan oleate, ethoxylated nonylphenol, and polysorbate-80.

[0021] The present invention also provides a water-based drilling fluid, which comprises the following raw materials, measured in parts by weight: 400 parts of water, 12 to 20 parts of bentonite, 0.6 to 1 part of sodium carbonate, 0.8 to 1.6 parts of a coating agent, 8 to 12 parts of a fluid loss reducer, 8 to 16 parts of a lubricant, 2.4 to 4 parts of a shale inhibitor, and 20 to 32 parts of a plugging agent, wherein the lubricant is the above lubricant;

[0022] The coating agent includes at least one of a zwitterionic polymer strong coating agent and potassium polyacrylate;

[0023] The fluid loss reducer comprises at least one of sulfomethylphenolic resin, lignite resin, polyanionic cellulose and sodium carboxymethyl cellulose;

[0024] The shale inhibitor is a polyamine inhibitor;

[0025] The plugging agent includes at least one of ultrafine calcium carbonate and nano latex plugging agent.

[0026] On the other hand, the present invention also provides a method for preparing a water-based drilling fluid, comprising the following steps:

[0027] A. Take 400 parts of water, 12-20 parts of bentonite, 0.6-1 parts of sodium carbonate, 0.8-1.6 parts of coating agent, 8-12 parts of fluid loss reducer, 8-16 parts of lubricant, 2.4-4 parts of shale inhibitor and 20-32 parts of plugging agent, wherein the lubricant is the above lubricant;

[0028] B. Add bentonite into water, then add sodium carbonate, stir and stand for hydration to obtain fresh water base slurry, then add coating agent, filtrate reducer, lubricant, shale inhibitor and plugging agent in sequence and stir to obtain water-based drilling fluid.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] 1. The product F prepared by the present invention uses sulfonic acid amine groups as active adsorption groups and can be stably adsorbed on drill strings, casings and mud cakes. At the same time, it has two C16 flexible chains, which can form a dense lubricating film and effectively reduce friction resistance.

[0031] 2. The highly adsorbent and highly lubricating lubricant prepared by the present invention is added with a surfactant to ensure good dispersion in the drilling fluid. At the same time, the extreme pressure lubrication coefficient reduction rate of the prepared lubricant reaches 92%, and the mud cake adhesion coefficient reduction rate reaches 61%, both of which are higher than the standard.

[0032] 3. The water-based drilling fluid prepared by the present invention has good rheological properties and filtration loss properties. DETAILED DESCRIPTION

[0033] The technical solutions in some embodiments of the present disclosure are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0034] 1. Example of Preparation of Lubricant Additive Product F

[0035] Example 1

[0036] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 8.5g of potassium hydroxide, and 0.5g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. 30g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. The intermediate D-2 and 30g of thionyl chloride were added to a round-bottom flask, and then 2g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction, the excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F1.

[0037] Example 2

[0038] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 11g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 30g of thionyl chloride were added to a round-bottom flask, and then 2g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F2.

[0039] Example 3

[0040] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.9g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 60g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 30g of thionyl chloride were added to a round-bottom flask, and then 2g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F3.

[0041] Example 4

[0042] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 30g of thionyl chloride were added to a round-bottom flask, and then 2g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F4.

[0043] Example 5

[0044] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F5.

[0045] Example 6

[0046] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 60g of thionyl chloride were added to a round-bottom flask, and then 4g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 7 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F6.

[0047] Example 7

[0048] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 12 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F7.

[0049] Example 8

[0050] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 50°C for 12h to obtain a mixture C. After the reaction, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 17 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F8.

[0051] Example 9

[0052] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 60°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 17 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F9.

[0053] Example 10

[0054] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 60°C for 24h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 16 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F10.

[0055] Embodiment 11

[0056] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.65g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 60°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 55°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 45g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 17 g of aqueous ammonia was added to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F11.

[0057] Example 12

[0058] 6g of deionized water, 54g of tetrahydrofuran, 6g of taurine, 14g of potassium hydroxide, and 0.7g of potassium iodide were added to a round-bottom flask and stirred to obtain a mixture A. Then 45g of 1-bromohexadecane was dissolved in 20g of tetrahydrofuran to obtain liquid B, and liquid B was added dropwise to mixture A, and refluxed at 60°C for 12h to obtain a mixture C. After the reaction was completed, tetrahydrofuran and deionized water were removed by a rotary evaporator at 50°C to obtain a crude intermediate product D-1, which was washed with deionized water and then purified by a chromatography column to obtain an intermediate D-2. D-2 and 50g of thionyl chloride were added to a round-bottom flask, and then 3g of N,N-dimethylformamide was added, stirred at 0°C for 30 minutes, and then heated to 20°C for reaction. After the reaction was completed, excess thionyl chloride was removed by a rotary evaporator to obtain an intermediate E. The intermediate E was transferred to a round-bottom flask, 30 g of chloroform was added, and the temperature was lowered to 0°C. 17 g of ammonia water was slowly added dropwise to E, and the reaction was stirred to obtain a crude product. The crude product was washed with deionized water to obtain product F, which was recorded as F12.

[0059] According to the above preparation method, F1~F12 samples were prepared by changing the amount of raw materials, temperature and feeding method, and the yield of each sample was calculated. The results are shown in Table 1.

[0060]

[0061] It can be seen from Table 1 that the yield of the lubricant additive is increased by optimizing the reaction conditions. Among the listed examples, the reaction conditions of Example 12 are currently the best reaction conditions for preparing lubricants.

[0062] 2. Preparation of lubricants with strong adsorption and high lubrication efficiency

[0063] In this exemplary embodiment, 100 g of polyalphaolefin is selected as a representative base oil for the experiment, and a sample prepared by F12 is selected as a lubricant additive. This scheme is only used to explain this exemplary embodiment and is not used to limit this exemplary embodiment.

[0064] Comparative Example 1

[0065] 100 g of polyalphaolefin and 8 g of surfactant (the mass ratio of sorbitan oleate to polysorbate 80 is 1:1, and its HBL value is 13) are then stirred at 3000 rpm for 30 minutes to obtain lubricant R, which is recorded as R1.

[0066] Example 1

[0067] 100 g of polyalphaolefin, 8 g of surfactant (the mass ratio of sorbitan oleate to polysorbate 80 is 1:1, and its HBL value is 13), and 20 g of the sample F12 prepared by the present invention were stirred at 3000 rpm for 30 minutes to obtain lubricant R, which was recorded as R2.

[0068] Example 2

[0069] 100 g of polyalphaolefin, 8 g of surfactant (the mass ratio of sorbitan oleate to polysorbate 80 is 1:1, and its HBL value is 13), and 25 g of the sample F12 prepared by the present invention were stirred at 3000 rpm for 30 minutes to obtain lubricant R, which was recorded as R3.

[0070] Example 3

[0071] 100 g of polyalphaolefin, 8 g of surfactant (the mass ratio of sorbitan oleate to polysorbate 80 is 1:1, and its HBL value is 13), and 30 g of the sample F12 prepared by the present invention were stirred at 3000 rpm for 30 minutes to obtain lubricant R, which was recorded as R4.

[0072] Example 4

[0073] 100 g of polyalphaolefin, 10 g of surfactant (the mass ratio of sorbitan oleate to polysorbate 80 is 1:1, and its HBL value is 13), and 25 g of the sample F12 prepared by the present invention were stirred at 3000 rpm for 30 minutes to obtain lubricant R, which was recorded as R5.

[0074] The lubricant with strong adsorption and high-efficiency lubrication prepared by the above preparation method was tested for the extreme pressure lubrication coefficient reduction rate and the mud cake adhesion coefficient reduction rate according to standard Q-SY17088-2016 "Technical Specifications for Liquid Lubricants for Drilling Fluids", wherein the amount of lubricant added was selected to be 2wt%, and the test results are shown in Table 2.

[0075]

[0076] As can be seen from Table 2, the lubrication performance of Comparative Example 1 without adding lubricating additives is poor (Example 1), and the extreme pressure lubrication coefficient reduction rate and mud cake adhesion coefficient reduction rate are both low. As the amount of lubricating additives added increases, the lubrication performance of the configured lubricant gradually increases, as shown by the continuous increase in the extreme pressure lubrication coefficient reduction rate and the mud cake adhesion coefficient reduction rate. The lubrication performance of the lubricant configured in Example 3 far exceeds the requirements in the standard Q-SY17088-2016 "Technical Specifications for Liquid Lubricants for Drilling Fluids". By comparing Example 3 with Example 4, it can be seen that in the prepared lubricant, increasing the amount of surfactant has little effect on the lubrication performance, indicating that the lubricating effect is achieved by the lubricating additive prepared by the present invention.

[0077] 3. Preparation of water-based drilling fluid

[0078] In this exemplary embodiment, the amount of bentonite added is fixed at 16 parts, the coating agent is selected as a zwitterionic polymer strong coating agent (FA367), the filtrate reducer is selected as a lignite resin (SPNH), and the plugging agent is selected as 32 parts of ultrafine calcium carbonate for the experiment. This scheme is only used to explain this exemplary embodiment and is not used to limit this exemplary embodiment.

[0079] Test Example 1

[0080] The raw materials were weighed in parts by weight: 400 parts of water, 16 parts of bentonite, 0.8 parts of FA367, 8 parts of SPNH, 8 parts of R4 (lubricant R4 prepared in the above Example 4, the same applies below), 2.4 parts of polyamine inhibitor and 32 parts of ultrafine calcium carbonate.

[0081] Bentonite was added to water, and then 5% sodium carbonate of the mass of bentonite was added, stirred with a stirrer for 30 minutes, and then allowed to stand for hydration for 24 hours to obtain a fresh water-based slurry. The fresh water-based slurry was stirred with a stirrer, and then FA367, SPNH, R4, polyamine inhibitor, and ultrafine calcium carbonate were added in sequence. After adding one raw material, the next raw material was added at an interval of 5 minutes, and finally stirred at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, which was recorded as Y1.

[0082] Test Example 2

[0083] The raw materials were weighed in parts by weight: 400 parts of water, 16 parts of bentonite, 1.2 parts of FA367, 10 parts of SPNH, 8 parts of R4, 2.4 parts of polyamine inhibitor and 32 parts of superfine calcium carbonate.

[0084] Bentonite was added to water, and then 5% sodium carbonate of the mass of bentonite was added, stirred with a stirrer for 30 minutes, and then allowed to stand for hydration for 24 hours to obtain a fresh water-based slurry. The fresh water-based slurry was stirred with a low-speed stirrer, and then FA367, SPNH, R4, polyamine inhibitor, and ultrafine calcium carbonate were added in sequence. After adding one raw material, the next raw material was added at an interval of 5 minutes, and finally stirred at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, which was recorded as Y2.

[0085] Test Example 3

[0086] The raw materials were weighed in parts by weight: 400 parts of water, 16 parts of bentonite, 1.6 parts of FA367, 8 parts of SPNH, 8 parts of R4, 2.4 parts of polyamine inhibitor and 32 parts of superfine calcium carbonate.

[0087] Bentonite was added to water, and then 5% sodium carbonate of the mass of bentonite was added, stirred with a stirrer for 30 minutes, and then allowed to stand for hydration for 24 hours to obtain a fresh water-based slurry. The fresh water-based slurry was stirred with a stirrer, and then FA367, SPNH, R4, polyamine inhibitor, and ultrafine calcium carbonate were added in sequence. After adding one raw material, the next raw material was added at an interval of 5 minutes, and finally stirred at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, which was recorded as Y3.

[0088] Test Example 4

[0089] The raw materials were weighed in parts by weight: 400 parts of water, 16 parts of bentonite, 0.8 parts of FA367, 10 parts of SPNH, 8 parts of R4, 2.4 parts of polyamine inhibitor and 32 parts of superfine calcium carbonate.

[0090] Bentonite was added into water, and then 5% sodium carbonate of the mass of bentonite was added, stirred with a stirrer for 30 minutes, and then allowed to stand for hydration for 24 hours to obtain a fresh water-based slurry. The fresh water-based slurry was stirred with a stirrer, and then FA367, SPNH, R4, polyamine inhibitor, and ultrafine calcium carbonate were added in sequence. After adding one raw material, the next raw material was added at an interval of 5 minutes, and finally stirred at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, which was recorded as Y4.

[0091] Test Example 5

[0092] Weigh the raw materials by weight: 400 parts of water, 16 parts of bentonite, 0.8 parts of FA367, 10 parts of SPNH, 12 parts of R4, 3.2 parts of polyamine inhibitor and 32 parts of ultrafine calcium carbonate. Add bentonite to water, then add 5% sodium carbonate of the mass of bentonite, stir with a low-speed stirrer for 30 minutes, then stand and hydrate for 24 hours to obtain a freshwater-based slurry. Stir the freshwater-based slurry with a low-speed stirrer, then add FA367, SPNH, R3, polyamine inhibitor, ultrafine calcium carbonate in sequence, add one raw material after 5 minutes, and finally stir at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, recorded as Y5.

[0093] Test Example 6

[0094] The raw materials were weighed in parts by weight: 400 parts of water, 16 parts of bentonite, 0.8 parts of FA367, 12 parts of SPNH, 16 parts of R4, 2.4 parts of polyamine inhibitor and 32 parts of superfine calcium carbonate.

[0095] Bentonite was added to water, and then 5% sodium carbonate of the mass of bentonite was added, stirred with a low-speed stirrer for 30 minutes, and then allowed to stand for hydration for 24 hours to obtain a fresh water-based slurry. The fresh water-based slurry was stirred with a low-speed stirrer, and then FA367, SPNH, R4, polyamine inhibitor, and ultrafine calcium carbonate were added in sequence. After adding one raw material, the next raw material was added at an interval of 5 minutes, and finally stirred at 10000rpm for 10 minutes to obtain a water-based drilling fluid Y, which was recorded as Y6.

[0096] In order to investigate the performance of the water-based drilling fluid samples prepared by the present invention, the above-mentioned test example samples were subjected to performance tests according to the standard GB / T 16783.1-2014 "Field Test of Drilling Fluids in the Petroleum and Natural Gas Industry Part 1: Water-Based Drilling Fluids", and the aging temperature was 150°C. The test results are shown in Table 3.

[0097]

[0098] A “-” indicates that no test was performed.

[0099] It can be seen from Table 3 that the water-based drilling fluid prepared by the present invention has good rheological properties after aging at 150° C. At the same time, it can maintain a relatively small high temperature and high pressure fluid loss.

[0100] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0101] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A lubricant additive, characterized in that: Its chemical structure is: 。 2. A method for preparing the lubricant additive as claimed in claim 1, characterized in that: The following steps are involved: A. Take 6 parts of taurine, 30-60 parts of 1-bromohexadecane, 8.5-15 parts of potassium hydroxide, 0.5-0.9 parts of potassium iodide, 30-60 parts of thionyl chloride, 2-4 parts of N,N-dimethylformamide, 7-17 parts of ammonia water, and 30 parts of chloroform for later use; B. Prepare taurine, potassium hydroxide, potassium iodide and a solvent into a mixture A, dissolve 1-bromohexadecane into liquid B, add liquid B dropwise into the mixture A and reflux to obtain a mixture C, remove the solvent to obtain a crude intermediate product D-1, and then wash and purify to obtain an intermediate D-2; C. Mix the intermediate D-2, thionyl chloride and N,N-dimethylformamide and stir to react, and remove the excess thionyl chloride after the reaction to obtain the intermediate E; D, to the intermediate E was added chloroform and ammonia solution and stirred to react, and the product F was obtained by washing; The reaction equation is as follows: 。 3. The preparation method according to claim 2, characterized in that: In step B, the reflux temperature is 50-60° C. and the time is 12-24 hours.

4. The preparation method according to claim 2, characterized in that: In step C, the reaction temperature is 20°C, and in step D, the reaction temperature is 0°C.

5. A lubricant, characterized in that: The invention comprises the following raw materials in parts by weight: 80-100 parts of base oil, 8-10 parts of surfactant and 20-30 parts of lubricant additive, wherein the lubricant additive is the lubricant additive according to claim 1 or the lubricant additive prepared by the preparation method according to any one of claims 2 to 4.

6. A lubricant according to claim 5, characterized in that: The base oil includes at least one of polyalphaolefin, white oil and epoxidized soybean oil.

7. A lubricant according to claim 5, characterized in that: The HBL value of the surfactant is 13-15.

8. A lubricant according to claim 5, characterized in that: The surfactant includes at least one of sorbitan trioleate, sorbitan oleate, ethoxylated nonylphenol and polysorbate-80.

9. A water-based drilling fluid, characterized in that: In parts by weight, the following raw materials are included: 400 parts of water, 12-20 parts of bentonite, 0.6-1 parts of sodium carbonate, 0.8-1.6 parts of coating agent, 8-12 parts of fluid loss reducer, 8-16 parts of lubricant, 2.4-4 parts of shale inhibitor and 20-32 parts of plugging agent, wherein the lubricant is the lubricant according to any one of claims 5 to 8; The coating agent includes at least one of a zwitterionic polymer strong coating agent and potassium polyacrylate; The fluid loss reducer comprises at least one of sulfomethylphenolic resin, lignite resin, polyanionic cellulose and sodium carboxymethyl cellulose; The shale inhibitor is a polyamine inhibitor; The plugging agent includes at least one of ultrafine calcium carbonate and nano latex plugging agent.

10. A method for preparing a water-based drilling fluid as claimed in claim 9, characterized in that: The following steps are involved: A. 400 parts of water, 12-20 parts of bentonite, 0.6-1 parts of sodium carbonate, 0.8-1.6 parts of coating agent, 8-12 parts of fluid loss reducer, 8-16 parts of lubricant, 2.4-4 parts of shale inhibitor and 20-32 parts of plugging agent, wherein the lubricant is the lubricant according to any one of claims 5 to 8; B. Add bentonite into water, then add sodium carbonate, stir and stand for hydration to obtain fresh water base slurry, then add coating agent, filtrate reducer, lubricant, shale inhibitor and plugging agent in sequence and stir to obtain water-based drilling fluid.

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