Intelligent temperature-control high-performance drilling and completion lubricant

Abstract

The invention relates to the technical field of petroleum drilling lubricants, and particularly discloses an intelligent temperature-control high-performance drilling and completion lubricant which comprises the following raw materials: base oil, an anti-wear compound, a viscosity index improver, a surface active component, an antioxidant and an ultraviolet absorber, the lubricating oil is prepared by the following method: adding base oil into a stirrer, uniformly stirring and mixing, keeping a stirring state, adding an anti-wear compound and uniformly dispersing, adding a viscosity index improver and uniformly dispersing, adding a surfactant and uniformly dispersing, finally adding an antioxidant and an ultraviolet absorber, and stirring until uniformly mixing, thereby obtaining the lubricating oil. The required intelligent temperature-control high-performance drilling and completion lubricant is obtained; the intelligent temperature-control high-performance drilling and completion lubricant prepared by the invention is mainly suitable for drilling and completion processes in high-temperature and high-pressure environments, especially for the working conditions of insufficient lubricant performance stability and serious equipment wear.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling lubricants, and more specifically, to an intelligent temperature-controlled high-performance drilling and completion lubricant. Background Art

[0002] Traditional drilling and completion lubricants are mostly based on mineral oil or synthetic oil. Although they have a certain lubrication effect, their performance decreases significantly under extreme conditions (such as high temperature and high pressure environments), making it difficult to meet the needs of modern efficient drilling. In recent years, with the development of new materials science, some new lubricants, such as water-based emulsions and bio-based lubricants, have been proposed and gradually applied in industrial practice. They have eliminated the limitations of traditional lubricants to a certain extent. However, these new lubricants still face problems such as poor adaptability to high temperature and high pressure environments and unstable lubrication performance. They cannot target and strongly improve the lubrication coefficient of the friction surface, making it difficult to meet the needs of deep-sea and deep oil and gas field drilling and development.

[0003] At present, the industry mainly adopts two technical paths to solve the lubrication problem under high temperature and high pressure conditions: one is to improve the base oil formula, such as adding anti-wear agents, rust inhibitors and other additives to enhance the comprehensive performance of lubricants; the other is to use a special production process to prepare a base oil with a high viscosity index, trying to improve the fluidity and stability of lubricants in a wide temperature range. Although the former can improve the wear resistance and durability of lubricants to a certain extent, it often leads to a substantial increase in the cost of lubricants; although the latter solves the problems of difficult low-temperature starting and fast high-temperature evaporation to a certain extent, the long-term stability at extremely high temperatures is still poor.

[0004] Although existing solutions have achieved certain results in some aspects, they still have obvious defects. On the one hand, relying solely on additives cannot fundamentally solve the problem of lubricant performance degradation in high temperature and high pressure environments, especially in the case of long-term continuous operation, the effective ingredients of additives are easily depleted; on the other hand, although the base oil with a high viscosity index improves the thermal stability of the fluid, it also increases the difficulty of pumping and limits its scope of application. Based on the obvious limitations of existing lubricants, the present invention provides an intelligent temperature-controlled high-performance drilling and completion lubricant. Summary of the invention

[0005] In order to solve the problems that existing lubricants are prone to cause serious equipment wear and unstable lubricant performance during drilling and completion under high temperature and high pressure environments, based on the principle of frictional heat generation, since under the same temperature field during the drilling process, places with higher temperatures are also places where friction is more serious, the present invention provides an intelligent temperature-controlled high-performance drilling and completion lubricant, which realizes the technology of intelligently responding to temperature changes of the lubricant to target and improve the lubrication coefficient.

[0006] The present invention provides an intelligent temperature-controlled high-performance drilling and completion lubricant, which adopts the following technical solutions: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70-90 parts of base oil, 5-15 parts of anti-wear compounds, 5-15 parts of viscosity index improvers, 1-5 parts of surfactants, 0.5-2 parts of antioxidants, and 0.1-1 parts of ultraviolet light absorbers.

[0007] Preferably, the base oil is prepared by the following method: The nanoparticles are mixed with a dispersant and then ultrasonically dispersed for 30-40 minutes to obtain pretreated nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 5-7:1-3:1-2, heat to 60-80°C, and stir and mix for 20-40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred continuously for 20-40 minutes to obtain the base oil.

[0008] Preferably, the nanoparticles are silicon dioxide or aluminum oxide.

[0009] Preferably, the dispersant is polyvinyl alcohol, and its added amount is 1-3% of the mass of the nanoparticles.

[0010] Preferably, the phase change material is a paraffin-based phase change material.

[0011] Preferably, the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10-30% of the mass of the base oil carrier.

[0012] Preferably, the polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into a reactor in a mass ratio of 2-4:1-2:6-8, and a solvent of 20-30% of the total mass of the reaction raw materials and a catalyst of 1-2% of the total mass of the reaction raw materials are added. The temperature is raised to 120-150° C. and stirred for reaction for 3-6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180-220° C. and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10-50 mmHg, and the reaction is continued under vacuum for 1-2 hours; after the reaction is completed, the reaction system is cooled to below 80° C., and a base is added to neutralize the catalyst; and polyol esters are obtained by filtering and rotary evaporation.

[0013] Preferably, the catalyst is sulfuric acid.

[0014] Preferably, the base is sodium carbonate.

[0015] Preferably, the anti-wear compound comprises nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3-5:1-2:1.

[0016] Preferably, the surface active ingredient comprises oleyl diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2-3:1.

[0017] Preferably, the viscosity index improver is ethylene propylene copolymer.

[0018] Preferably, the antioxidant is a phenolic antioxidant.

[0019] Preferably, the ultraviolet light absorber is a benzotriazole compound.

[0020] Preferably, the intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0021] In summary, the present invention has the following beneficial effects: The present invention utilizes nanotechnology, viscosity index improvers and phase change materials to prepare base oil, so that the lubricant exhibits significant viscosity within a temperature range of 100° C. to 200° C., forms an effective protective film, and reduces direct contact with metal surfaces; by adding anti-wear compounds, a stable protective layer can be formed on the metal surface, effectively preventing direct friction between metals under high pressure and high speed conditions; by introducing efficient surfactant components, the components can be effectively adsorbed on the metal surface to form a lubricating film, especially under boundary lubrication conditions, the friction coefficient can be significantly reduced; by adding antioxidants and ultraviolet light absorbers, the comprehensive performance of the lubricant is further improved, ensuring good stability and long-term effectiveness in a wide temperature range and complex environments.

[0022] The present invention adopts a paraffin-based phase change material with high temperature sensitivity, which can make the lubricant adapt to a wider working temperature range; at high temperature, the polymer molecular chain of the viscosity index improver will change from a curled state to an extended state, and the effective volume will increase, thereby increasing the flow resistance of the lubricating oil and causing a significant increase in viscosity. When the mechanical drill bit generates heat due to friction during rapid rotation, the temperature around the mechanical drill bit increases, thereby increasing the viscosity of the lubricating oil. After the fluidity becomes poor, it can accumulate on the surface and adhere to the metal surface of the mechanical drill bit to form a thicker protective film. Thereby, the drilling tools can be protected quickly and effectively, and temperature control can be achieved to reduce the friction coefficient; nano-ceramic particles, zinc dialkyl dithiophosphate and tri(trimethylsilyl) borate are used together as anti-wear compounds, which can react quickly to generate a protective layer while enhancing the wear resistance, further enhancing the anti-wear effect, and introducing the boron element to make it have better thermal stability and corrosion resistance; the addition of surfactant components can significantly reduce the friction coefficient and improve the lubrication efficiency under boundary lubrication conditions, ensuring smooth operation under harsh working conditions; the lubricant prepared by the present invention has excellent comprehensive performance and can maintain good stability and long-term effectiveness in a wide temperature range and complex environment.

[0023] The core of the present invention is to realize the intelligent response of lubricants to temperature changes through the integration of nanotechnology, base oil of phase change materials, viscosity index improvers and a variety of functional additives, so as to improve the lubrication coefficient in a targeted manner, and effectively protect the equipment during the drilling process, and significantly improve the working efficiency and durability of the equipment under high temperature and high pressure environments; the synergistic effect of anti-wear compounds and efficient surfactants greatly reduces the wear of equipment, prolongs the service life of equipment, and reduces maintenance costs; the intelligent temperature-controlled high-performance drilling and completion lubricant prepared by the present invention is mainly suitable for drilling and completion processes under high temperature and high pressure environments, especially for working conditions where the lubricant performance stability is insufficient and the equipment wear is severe. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the embodiments.

[0025] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0026] Unless otherwise specified, the materials, reagents, etc. used in the examples and comparative examples of the present invention can be obtained from commercial sources. Among them, silicon dioxide, product number LF-SiO 2 --N30, purchased from Ningbo Luofei Nanotechnology Co., Ltd.; Alumina, product number LF-Al203-N30, was purchased from Ningbo Luofei Nanotechnology Co., Ltd.; Phase change material, PCM phase change material, model TH-SL-10, purchased from Suzhou Kangzhilu Technology Co., Ltd.; Polyvinyl alcohol, PVA dispersant, was purchased from Shanghai Ziyi Chemical Co., Ltd.; Polyalphaolefin, brand name Synfluid PAO, purchased from Dongguan Hongli Chemical Technology Co., Ltd.; Polyisobutylene, CAS No. 1629-95-02, molecular weight 55,000, purchased from Shandong Qiyi Chemical Technology Co., Ltd.; Nano-ceramic particles, nano-chromium carbide, particle size 300nm-500nm, purchased from Ningbo Luofei Nanotechnology Co., Ltd.; Ethylene propylene polymer, CAS No. 9010-79-1, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; Oleic acid diethanolamide, CAS No. 93-83-4, purchased from Hubei Zhongnuoyaxing Biotechnology Co., Ltd.); Fatty acid methyl ester ethoxylate sulfonate, FMES, with an active ingredient content of 70%, was purchased from Hubei Xinjiecheng Chemical Technology Co., Ltd.; Dipentaerythritol ester, brand name Priolube 3987, was purchased from Dongguan Hongli Chemical Technology Co., Ltd.

[0027] Embodiments 1-3 provide an intelligent temperature-controlled high-performance drilling and completion lubricant.

[0028] Embodiment 1: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0029] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 5:1:1, heat to 60°C, and stir and mix at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0030] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added to the reactor in a mass ratio of 2:1:6, and tetrahydrofuran (20% of the total mass of the reaction raw materials) and concentrated sulfuric acid (1% of the total mass of the reaction raw materials) are added, and the temperature is raised to 120°C, and the reaction is stirred at a speed of 500r / min for 6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180°C, and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10mmHg, and the reaction is continued under vacuum for 2 hours; after the reaction is completed, the reaction system is cooled to 50°C, sodium carbonate is added to neutralize the catalyst; and polyol esters are obtained by filtration and rotary evaporation. Among them, the anti-wear compound includes nano-ceramic particles, zinc dialkyl dithiophosphate and tris (trimethylsilane) borate in a mass ratio of 3:1:1.

[0031] Wherein, the viscosity index improver is ethylene propylene polymer.

[0032] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2:1.

[0033] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0034] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0035] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0036] Embodiment 2: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 80 parts of base oil, 10 parts of anti-wear compounds, 10 parts of viscosity index improvers, 3 parts of surfactants, 1 part of antioxidants, and 0.5 parts of ultraviolet light absorbers.

[0037] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 350W, the ultrasonic frequency to be 30KHz, and the ultrasonic dispersion was performed for 35 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were aluminum oxide, and the dispersant was polyvinyl alcohol, and the addition amount was 2% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 6:2:1.5, heat to 70°C, and stir and mix at a speed of 400 r / min for 30 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 30 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 20% of the base oil carrier mass.

[0038] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 3:1.5:7, and 25% of the total mass of tetrahydrofuran and 1.5% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 135°C and the reaction is stirred at a speed of 550r / min for 4.5h. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 200°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 30mmHg, and the reaction is continued under vacuum for 1.5h; after the reaction is completed, the reaction system is cooled to 60°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0039] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 4:1.5:1.

[0040] Wherein, the viscosity index improver is ethylene propylene polymer.

[0041] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2.5:1.

[0042] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0043] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0044] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0045] Embodiment 3: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 90 parts of base oil, 15 parts of anti-wear compounds, 15 parts of viscosity index improvers, 5 parts of surfactants, 2 parts of antioxidants, and 1 part of ultraviolet light absorbers.

[0046] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 400 W, the ultrasonic frequency to be 35 KHz, and the ultrasonic dispersion was performed for 30 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 3% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; The polyalphaolefin, polyol ester and polyisobutylene were mixed in a mass ratio of 7:3:2, heated to 80°C, and stirred at a speed of 500 r / min for 20 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 30% of the base oil carrier mass.

[0047] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 2:1:4, and 30% of the total mass of tetrahydrofuran and 2% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 150°C and stirred at a speed of 600r / min for 3 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 220°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 50mmHg, and the reaction is continued under vacuum for 1 hour; after the reaction is completed, the reaction system is cooled to 70°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0048] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 5:2:1.

[0049] Wherein, the viscosity index improver is ethylene propylene polymer.

[0050] The surfactant components include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 3:1.

[0051] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0052] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0053] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0054] In order to verify the comprehensive performance of the intelligent temperature-controlled high-performance drilling and completion lubricant prepared in Examples 1-3 of the present invention, the applicant set up comparative examples 1-5, which are as follows: Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that the mass of polyol ester is replaced by poly-alpha-olefin, as follows: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0055] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; The polyalphaolefin and polyisobutylene were mixed in a mass ratio of 6:1, heated to 60°C, and stirred at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0056] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 2:1:6, and 20% of the total mass of tetrahydrofuran and 1% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 120°C and stirred at a speed of 500r / min for 6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10mmHg, and the reaction is continued under vacuum for 2 hours; after the reaction is completed, the reaction system is cooled to 50°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0057] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3:1:1.

[0058] Wherein, the viscosity index improver is ethylene propylene polymer.

[0059] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2:1.

[0060] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0061] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0062] Comparative Example 2: The difference between Comparative Example 2 and Example 1 is that the mass of polyisobutylene is replaced by polyalphaolefin, as follows: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0063] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; The polyalphaolefin and the polyol ester were mixed in a mass ratio of 6:1, heated to 60°C, and stirred at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0064] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 2:1:6, and 20% of the total mass of tetrahydrofuran and 1% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 120°C and stirred at a speed of 500r / min for 6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10mmHg, and the reaction is continued under vacuum for 2 hours; after the reaction is completed, the reaction system is cooled to 50°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0065] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3:1:1.

[0066] Wherein, the viscosity index improver is ethylene propylene polymer.

[0067] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2:1.

[0068] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0069] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0070] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0071] Comparative Example 3: The difference between Comparative Example 3 and Example 1 is that the mass of polyol ester is replaced by dipentaerythritol ester, as follows: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0072] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Polyalphaolefin, dipentaerythritol ester and polyisobutylene are mixed in a mass ratio of 5:1:1, heated to 60°C, and stirred at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0073] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3:1:1.

[0074] Wherein, the viscosity index improver is ethylene propylene polymer.

[0075] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2:1.

[0076] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0077] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0078] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0079] Comparative Example 4: The difference between Comparative Example 4 and Example 1 is that the anti-wear compound includes nano-ceramic particles and zinc dialkyl dithiophosphate in a mass ratio of 3:1, as follows: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0080] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 5:1:1, heat to 60°C, and stir and mix at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0081] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 2:1:6, and 20% of the total mass of tetrahydrofuran and 1% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 120°C and stirred at a speed of 500r / min for 6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10mmHg, and the reaction is continued under vacuum for 2 hours; after the reaction is completed, the reaction system is cooled to 50°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0082] The anti-wear compound comprises nano ceramic particles and zinc dialkyl dithiophosphate in a mass ratio of 3:1.

[0083] Wherein, the viscosity index improver is ethylene propylene polymer.

[0084] The surface active ingredients include oleic acid diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2:1.

[0085] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0086] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0087] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0088] Comparative Example 5: The difference between Comparative Example 5 and Example 1 is that the surfactant component is oleyl diethanolamide, which is as follows: An intelligent temperature-controlled high-performance drilling and completion lubricant comprises the following raw materials in parts by weight: 70 parts of base oil, 5 parts of anti-wear compounds, 5 parts of viscosity index improvers, 1 part of surfactants, 0.5 parts of antioxidants, and 0.1 parts of ultraviolet light absorbers.

[0089] Among them, the base oil is prepared by the following method: The nanoparticles were mixed with a dispersant, and the ultrasonic power was controlled to be 300 W, the ultrasonic frequency to be 25 KHz, and the ultrasonic dispersion was performed for 40 minutes to obtain pretreated nanoparticles, wherein the nanoparticles were silicon dioxide, and the dispersant was polyvinyl alcohol, and the addition amount was 1% of the mass of the nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 5:1:1, heat to 60°C, and stir and mix at a speed of 300 r / min for 40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred for 20 minutes to obtain the base oil, wherein the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10% of the base oil carrier mass.

[0090] The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into the reactor in a mass ratio of 2:1:6, and 20% of the total mass of tetrahydrofuran and 1% of the total mass of concentrated sulfuric acid are added. The temperature is raised to 120°C and stirred at a speed of 500r / min for 6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180°C and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10mmHg, and the reaction is continued under vacuum for 2 hours; after the reaction is completed, the reaction system is cooled to 50°C and sodium carbonate is added to neutralize the catalyst; the polyol ester is obtained by filtration and rotary evaporation.

[0091] The anti-wear compound includes nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3:1:1.

[0092] Wherein, the viscosity index improver is ethylene propylene polymer.

[0093] Among them, the surfactant is oleyl diethanolamide.

[0094] The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0095] Wherein, the ultraviolet light absorber is 2-(2-hydroxy-5-benzyl)benzotriazole.

[0096] An intelligent temperature-controlled high-performance drilling and completion lubricant is prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the blender, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, then add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.

[0097] Performance testing: With reference to standard Q / SY17088-2016 "Technical Specifications for Liquid Lubricants for Drilling Fluids", the comprehensive performance of the intelligent temperature-controlled high-performance drilling and completion lubricants prepared in Examples 1-3 of the present invention and Comparative Examples 1-5 were tested respectively, and the results are shown in Table 1 below.

[0098] Table 1: ; It can be seen from the data shown in Table 1 above that the comprehensive performance of the intelligent temperature-controlled high-performance drilling and completion lubricants obtained in Examples 1-3 of the present invention is significantly improved compared with that of Comparative Examples 1-5, and good stability and long-term effectiveness are maintained in a wide temperature range and complex environment.

[0099] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to the embodiment of the present invention as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. An intelligent temperature-controlled high-performance drilling and completion lubricant, characterized in that: The raw materials include the following parts by weight: 70-90 parts of base oil, 5-15 parts of anti-wear compound, 5-15 parts of viscosity index improver, 1-5 parts of surfactant, 0.5-2 parts of antioxidant, and 0.1-1 parts of ultraviolet light absorber; The base oil is prepared by the following method: The nanoparticles are mixed with a dispersant and then ultrasonically dispersed for 30-40 minutes to obtain pretreated nanoparticles; The phase change material is heated until it is completely melted to obtain a molten phase change material; Mix polyalphaolefin, polyol ester and polyisobutylene in a mass ratio of 5-7:1-3:1-2, heat to 60-80°C, and stir and mix for 20-40 minutes to obtain a base oil carrier; The pretreated nanoparticles and the melted phase change material are added to the base oil carrier and stirred continuously for 20-40 minutes to obtain the base oil.

2. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The nanoparticles are silicon dioxide or aluminum oxide; the dispersant is polyvinyl alcohol, and the added amount thereof is 1-3% of the mass of the nanoparticles.

3. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The phase change material is a paraffin-based phase change material; the pretreated nanoparticles and the melted phase change material have the same mass, both accounting for 10-30% of the mass of the base oil carrier.

4. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The polyol ester is prepared by the following method: The reaction raw materials of pentaerythritol, trimethylolpropane and isooctanoic acid are added into a reactor in a mass ratio of 2-4:1-2:6-8, and a solvent of 20-30% of the total mass of the reaction raw materials and a catalyst of 1-2% of the total mass of the reaction raw materials are added. The temperature is raised to 120-150° C. and stirred for reaction for 3-6 hours. The water generated during the reaction is removed through a condenser and a water separator; then the temperature is raised to 180-220° C. and the reaction is continued until no water is generated; the vacuum system is turned on, the pressure of the reaction system is reduced to 10-50 mmHg, and the reaction is continued under vacuum for 1-2 hours; after the reaction is completed, the reaction system is cooled to below 80° C., and a base is added to neutralize the catalyst; and polyol esters are obtained by filtering and rotary evaporation.

5. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The anti-wear compound comprises nano ceramic particles, zinc dialkyl dithiophosphate and tris(trimethylsilyl)borate in a mass ratio of 3-5:1-2:

1.

6. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The viscosity index improver is an ethylene propylene polymer.

7. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The surface active ingredients include oleyl diethanolamide and fatty acid methyl ester ethoxylate sulfonate in a mass ratio of 2-3:

1.

8. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The antioxidant is a phenolic antioxidant.

9. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: The ultraviolet light absorber is a benzotriazole compound.

10. The intelligent temperature-controlled high-performance drilling and completion lubricant according to claim 1, characterized in that: Prepared by the following method: Weigh the raw material base oil, anti-wear compound, viscosity index improver, surfactant, antioxidant and ultraviolet light absorber by weight for later use; Add base oil to the agitator, stir and mix evenly, keep stirring, add anti-wear compound and disperse evenly, add viscosity index improver and disperse evenly, add surfactant and disperse evenly, finally add antioxidant and ultraviolet light absorber, stir until mixed evenly, and you can get the required intelligent temperature control high-performance drilling and completion lubricant.