CN115093838A - Environment-friendly degradable drilling lubricant and preparation method thereof - Google Patents
Environment-friendly degradable drilling lubricant and preparation method thereof Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The invention relates to an environment-friendly and degradable drilling lubricant which comprises the following raw materials in parts by weight: 35-50 parts of vegetable base oil, 12-20 parts of trimethylolpropane vegetable fatty acid ester, 11-16 parts of isoparaffin, 8-12 parts of oleate, 10-14 parts of lipophilic nonionic surfactant, 4-8 parts of vegetable fatty acid salt, 5-8 parts of chitin phosphate, 2-4 parts of lipoate, 1.5-2.6 parts of pour point depressant and 3-5 parts of anti-foaming agent. When the addition of the lubricant in the drilling fluid is 0.5wt%, the reduction rate of the lubrication coefficient is more than 90%, the foaming rate is less than 5%, the condensation point of the lubricant is less than minus 30 ℃, the surface tension is less than 30mN/m, the reduction rate of the lubrication coefficient still keeps a satisfactory degree at the high temperature of 160 ℃ plus 200 ℃, and the requirements of remarkable lubrication effect, low foaming rate, low condensation point and mud pack prevention can be met; meanwhile, the biodegradable polyester film has good biodegradability and is green and environment-friendly.
Description
Technical Field
The invention belongs to the field of drilling lubricants, and particularly relates to an environment-friendly degradable drilling lubricant and a preparation method thereof.
Background
In the exploration and development of oil and gas resources, well drilling is an essential means. Drilling fluids are used in drilling operations. The effects of the drilling fluid include stabilizing the borehole wall, cleaning the borehole, assisting in breaking rock, cooling the drilling tool, acting as a signal transmission medium, and the like. Along with the continuous development of exploration and development, large-displacement large-inclination directional wells, wells with complex structures and horizontal wells are more and more, so that the friction between a drilling tool and a well wall or between the drilling tool and a casing is larger and larger, the drilling tool is seriously abraded in the drilling process, the applied pressure cannot be transmitted to the bottom of the well from the drilling tool, the drilling speed is reduced, the resistance of the drilling tool is increased, the drilling tool is easily stuck to the well wall to cause differential pressure drill clamping, and in addition, mud bags of the drilling tool and the drilling tool also easily cause safety accidents such as drill clamping and the like. Therefore, necessary measures are required in drilling construction or an auxiliary agent is added into the drilling fluid to prevent mud entrapment, so that the lubricity of the drilling fluid is improved to avoid accidents.
The drilling fluid lubricant is an important additive in the drilling fluid, and has the functions of reducing the frictional resistance between a drilling tool and the wall of an open hole well and between the drilling tool and a metal casing pipe, preventing bit balling, and further achieving the purposes of improving the drilling speed, preventing drill sticking and reducing the wear of the drilling tool. To date, drilling fluid lubricants have been very diverse, but have many disadvantages: (1) the performance is single, and the lubricating performance, the anti-balling performance and the environmental protection performance cannot be well considered; (2) the anti-foaming capability is poor, and most lubricants foam the drilling fluid in practical application to influence the circulation of the drilling fluid. And (3) the fluidity is poor at low temperature, and some vegetable oil lubricants are easy to solidify after the temperature is below-10 ℃, so that the lubricants cannot be used in northern cold regions. (4) The drill bit mud bag is easy to generate, the drill bit mud bag means that the surface of a drill bit is wrapped by mud lumps, the drill bit is difficult to drill, the difficulty of the teeth entering the bottom layer is increased, and the rotating speed is reduced. Bit balling is severe and can even result in bit damage. (5) The environmental protection is not good. During the use of the lubricant, a large amount of lubricant flows into the environment, so that in some environment-sensitive areas, such as seawater operation, the drilling fluid is required to have low biological toxicity so as to meet the requirement of environmental emission. Therefore, the environmentally-friendly biodegradable lubricant is a hot point developed in petroleum and drilling operation at present.
Due to environmental requirements, environmentally friendly lubricants based on vegetable oils are rapidly developed, but vegetable oils have poor oxidation stability and low temperature resistance, and cannot sufficiently exert the effects in drilling lubricants, and at present, mineral oil-based lubricants still occupy most of market shares. The development of an environmentally friendly, biodegradable lubricant for drilling is becoming increasingly important.
Many drilling lubricants now incorporate a metal-containing lubricant, such as molybdenum metal, in an attempt to improve extreme pressure wear resistance of the drill bit, but such lubricants do not meet the low biotoxicity requirements, are environmentally polluting and limit their use in environmentally sensitive areas. For example, CN114015422A, which uses polyether disulfide with molybdenum carbamate. There are also patents which add fluorosurfactants to improve lubricity in the hopes of achieving better lubrication, such as the lubricant described in CN11329099A, but the actual amount of fluorosurfactant added is small and may have some environmental impact.
Disclosure of Invention
The invention aims to provide a lubricant which is biodegradable, has excellent anti-balling and lubricating properties, has low foaming rate and excellent comprehensive performance and can be used in cold regions below 30 ℃.
The object of the present invention is achieved by the following method.
An environment-friendly degradable drilling lubricant comprises the following raw materials in parts by weight:
35-50 parts of vegetable base oil, 12-20 parts of trimethylolpropane vegetable fatty acid ester, 11-16 parts of isoparaffin, 8-12 parts of oleate, 10-14 parts of lipophilic nonionic surfactant, 4-8 parts of vegetable fatty acid salt, 5-8 parts of chitin phosphate, 2-4 parts of lipoate, 1.5-2.6 parts of pour point depressant and 3-5 parts of anti-foaming agent.
The vegetable base oil is at least one selected from castor oil, soybean oil, palm oil, rapeseed oil, peanut oil, linseed oil, olive oil and sunflower oil. Conventionally, mineral oils have been generally used as base oil components for obtaining good lubricating properties, but mineral oils are not environmentally friendly and are not easily biodegradable. However, although the vegetable oil is environment-friendly and degradable, the vegetable oil as the base oil of the lubricant for drilling has two disadvantages, on one hand, the vegetable oil has a high condensation point and a large reduction in the lubricating performance below-10 ℃, and on the other hand, the vegetable oil has a certain content of carbon-carbon unsaturated double bonds and has poor stability. In order to overcome the above-mentioned defects of vegetable oil, the carbon-carbon unsaturated double bond of vegetable oil is subjected to chemical modification treatment, such as epoxidation and hydroxylation. However, vegetable oils have the advantages of wide sources and low cost, and the chemical modification of vegetable oils increases the cost of lubricants. According to the invention, through the formula of the specific components, the defects of poor low-temperature fluidity and poor high-temperature resistance stability of the lubricant based on the vegetable base oil are obviously improved under the condition that the vegetable oil is not chemically modified.
The trimethylolpropane vegetable fatty acid ester is obtained by esterification reaction of vegetable fatty acid and trimethylolpropane, and is selected from at least one of ricinoleic acid, palmitoleic acid, soybean oleic acid and rapeseed oleic acid. The vegetable fatty acid can be purchased commercially or prepared by a method known in the art, which comprises hydrolyzing vegetable oil under alkaline conditions, adjusting pH to neutral with inorganic acid (such as hydrochloric acid), cooling, layering, washing, and drying to obtain the vegetable fatty acid.
Further, in the preparation method of the trimethylolpropane vegetable fatty acid ester, the catalyst is p-toluenesulfonic acid, heteropolyacid, titanate or stannous oxide, and the dosage of the catalyst is well known in the art, for example, when the p-toluenesulfonic acid is used, the dosage of the catalyst is 0.5-1% of the mass of the vegetable fatty acid, and when the stannous oxide is used as the catalyst, the dosage of the catalyst is 0.03-0.06%.
The isoparaffin is mineral hydrocarbon with biodegradability and lubricity and low viscosity and freezing point, such as at least one of isododecane, isometradecane and isomexadecane.
The oleate is at least one selected from methyl oleate, ethyl oleate, propyl oleate, butyl oleate, amyl oleate, hexyl oleate and octyl oleate.
The plant fatty acid salt is sodium salt and/or potassium salt of plant fatty acid, and the plant fatty acid is selected from at least one of ricinoleic acid, linolenic acid, oleic acid, linoleic acid, eleostearic acid, soya oil acid, tall oil acid, coconut oil acid, abietic acid and palmitoleic acid. Preferably, the plant fatty acid salt is a mixture of palmolein and abietate according to the mass ratio of 4-6: 1-2.
The lipophilic nonionic surfactant is sorbitan fatty acid ester (span), fatty alcohol polyoxyethylene ether (AEO) and isomeric alkyl alcohol polyoxyethylene ether according to the mass ratio of 3-5: 1-1.6: 0.5-0.8, wherein the HLB value of the sorbitan fatty acid ester is 4-7, and the HLB value of the fatty alcohol-polyoxyethylene ether is 10-14. Preferably, the sorbitan fatty acid ester is selected from at least one of Span40, Span60, Span 80; the polyoxyethylene ether of the fatty alcohol is selected from at least one of AEO-5, AEO-6, AEO-7, AEO-8 and AEO-9; the isomeric alkyl alcohol polyoxyethylene ether is selected from at least one of isomeric dodecyl alcohol polyoxyethylene ether, isomeric dodecyl alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether. The chitin phosphate is prepared from chitin and phosphorus pentoxide in the presence of methanesulfonic acid, wherein the mass ratio of the chitin to the phosphorus pentoxide to the methanesulfonic acid is 1: 1.3-1.8: 5-10; the deacetylation degree of the chitin is 80-95%.
Further, the chitin phosphate is prepared by a preparation method comprising the following steps of: dissolving chitin in methanesulfonic acid, slowly adding phosphorus pentoxide in ice water bath (0-5 deg.C), reacting for 2-4h, adding diethyl ether for precipitation, centrifuging, filtering, and washing to obtain the final product. Further, the phosphorus pentoxide is added within 20-30min, and the washing is carried out with at least one of diethyl ether, methanol, ethanol, and acetone.
The lipoate is selected from sodium lipoate and/or potassium lipoate.
The inventor unexpectedly finds that the heat resistance of the lubricant can be obviously improved by adding a certain amount of chitin phosphate and lipoate into the lubricant, so that the lubricant can keep good lubricating performance under the condition of high temperature (160-200 ℃). Although the reason is unknown, the single use of chitin phosphate or lipoate cannot provide excellent heat resistance of the lubricant, and the synergistic effect of the chitin phosphate and the lipoate is proved. The possible mechanism is that under the condition of high rotating speed and certain temp., the active sulfur and active phosphorus contained in the drill bit can be reacted on the metal surface to form the vulcanized and phosphatized protective film, so that the abrasion and sintering of metal in the course of high-speed operation of drill bit and drilling tool can be prevented. In addition, the lipoate has good oxidation resistance, and can protect unsaturated carbon-carbon double bonds from oxygen radicals generated in the high-speed operation of the drill bit in the vegetable base oil.
The pour point depressant is a polymer with a side chain containing long-chain alkyl, preferably, the pour point depressant is a polymer obtained by polymerizing (methyl) acrylic acid long-chain alkyl ester or N-long-chain alkyl (methyl) acrylamide as a monomer, and the long-chain alkyl is alkyl with 10-18 carbon atoms. More preferably, the long chain alkyl poly (meth) acrylate is selected from at least one of lauryl (meth) acrylate, myristyl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate; the poly-N-long-chain alkyl acrylamide is selected from at least one of poly-N-dodecyl acrylamide, N-tetradecyl methacrylamide and N-hexadecyl methacrylamide. Further, the molecular weight of the pour point depressant is 8000 to 20000, and the molecular weight dispersion index PDI is below 1.6.
The anti-foaming agent is a silicone oil anti-foaming agent, preferably polyether modified silicone oil, and has the viscosity of 500-1000 mpa.s.
The invention also provides a preparation method of the lubricant for drilling, which comprises the following steps:
adding the vegetable base oil, the oleate, the vegetable fatty acid salt, the vegetable fatty acid tribasic alcohol amine soap and the lipophilic nonionic surfactant into a reaction kettle, heating to 50-60 ℃, fully stirring for 0.5-1h, heating to 60-80 ℃, then adding the isoparaffin under the stirring condition, continuously stirring for 0.5-1h, then adding the chitin phosphate, the lipoate, the antifoaming agent and the pour point depressant, continuously stirring for 0.5-1h, and uniformly mixing to obtain the final lubricant product. The anti-balling lubricant product obtained by the invention is a light yellow or brown oily liquid.
In the formula of the lubricant, vegetable base oil, oleate and isoparaffin are used as main agents, and a specific oleophylic nonionic surfactant and various additives are matched to achieve the final effect. Vegetable oil or vegetable oil fatty acid ester is selected because of good lubricity and complete biodegradability; the isoparaffin is selected because of good lubricity and biodegradability of trimethylolpropane oleate castor oil, and can play a role in dilution when being compatible with vegetable oil; oleate and specific nonionic surfactant are selected to emulsify the base oil, so that the adsorption property with the metal surface is enhanced, and an oil film is continuous, thereby improving the lubricating property of the drilling fluid; the inventor also unexpectedly discovers that the lubricating performance of the lubricant is improved to a certain extent by adding a small amount of chitin phosphate and lipoate in the formula of the lubricant, and more importantly, the high-temperature resistance of the lubricant is obviously improved.
When the addition of the lubricant in the drilling fluid is 0.5wt%, the reduction rate of the lubricating coefficient is more than 90%, the foaming rate is less than 5%, the solidifying point of the lubricant is less than minus 30 ℃, the surface tension is less than 30mN/m, the reduction rate of the lubricating coefficient is basically not reduced at 160 ℃, the reduction rate of the lubricating coefficient at 200 ℃ still keeps a satisfactory degree, and the requirements of remarkable lubricating effect, low foaming rate, low solidifying point and mud pack prevention can be met. The lubricant prepared by the formula has remarkable lubricating property, anti-foaming property, anti-balling property and low-temperature service property, and simultaneously has good biodegradability and is environment-friendly.
Detailed Description
The foregoing invention will be described in further detail with reference to specific embodiments thereof. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention according to the common technical knowledge and the conventional means in the field.
Chitin was purchased from Shanxi Xia Biotech Co., Ltd, with a degree of deacetylation of 92%. The hexadecyl polymethacrylate was purchased from carnot technologies, wuhan, with a heavy molecular weight of about 1.2 ten thousand and a molecular weight dispersion index PDI = 1.46. The polyether modified silicone oil defoaming agent is purchased from Dai chemical engineering Co., Ltd, Shandong, with the viscosity of 800 mpa.s, the specific gravity of 1.02 and the surface tension of 1% aqueous solution of 26.5 mN/m.
Preparation example 1
Under the atmosphere of nitrogen, 1 mol part of trimethylolpropane, 3 mol parts of ricinoleic acid and p-toluenesulfonic acid with the mass of 0.65 wt% of the ricinoleic acid are added into a reaction kettle provided with a water separator as catalysts, a stirrer is started to heat and keep refluxing, when no water drop is formed in the water separator, the reaction is finished, cooling and discharging are carried out, and suction filtration is carried out, thus obtaining the finished product of trimethylolpropane ricinoleate.
Preparation example 2
Under the atmosphere of nitrogen, 1 molar part of trimethylolpropane, 3 molar parts of palmitoleic acid and p-toluenesulfonic acid with the mass of 0.72 wt% of palmitoleic acid are added into a reaction kettle provided with a water separator as catalysts, a stirrer is started to heat and keep refluxing, when no water drop is formed in the water separator, the reaction is finished, cooling and discharging are carried out, and suction filtration is carried out, so that the finished product of trimethylolpropane palmitoleate is obtained.
Preparation example 3
Dissolving 10 parts of chitin in 75 parts of methanesulfonic acid, slowly adding 13 parts of phosphorus pentoxide in an ice-water bath under stirring conditions within 0.5h, reacting for 3h, adding diethyl ether for precipitation, centrifuging, performing suction filtration, and washing with anhydrous diethyl ether and anhydrous ethanol in sequence to obtain chitin phosphate.
Further, the chitin phosphate is prepared by a preparation method comprising the following steps: dissolving chitin in methanesulfonic acid, slowly adding phosphorus pentoxide in ice water bath (0-5 deg.C), reacting for 2-4h, adding diethyl ether for precipitation, centrifuging, filtering, and washing to obtain the final product. Further, after the phosphorus pentoxide is added within 20-30min, washing is carried out with at least one of diethyl ether, methanol, ethanol, and acetone.
Example 1
Adding 20 parts by weight of castor oil, 20 parts by weight of rapeseed oil, 5 parts by weight of linseed oil, 16 parts by weight of trimethylolpropane ricinoleate prepared in preparation example 1, 10 parts of methyl oleate, 4 parts of potassium palmitate oleate, 2 parts of sodium abietate, 12 parts of a surfactant (a mixture of Span80, AEO-6 and isotridecanol polyoxyethylene ether in a mass ratio of 5:1.5: 0.5) into a reaction kettle, heating to 60 ℃, fully stirring for 30 minutes, continuously heating to 80 ℃, adding 14 parts of isocetyl alkane under the stirring condition, continuously stirring for 30 minutes, then adding 6 parts of chitin phosphate prepared in preparation example 3, 3 parts of potassium thioglycolate, 4 parts of polyether modified silicone oil ET203 and 2 parts of polyhexamethylene methacrylate, and continuously stirring for 30 minutes to uniformly mix to obtain a yellow oily liquid lubricant.
Example 2
Adding 30 parts by weight of palm oil, 20 parts by weight of castor oil, 20 parts by weight of trimethylolpropane palmitoleate prepared in preparation example 2, 12 parts of ethyl oleate, 6 parts of potassium palmitoleate, 2 parts of sodium abietate, 14 parts of surfactant (a mixture of Span80, AEO-7 and isotridecanol polyoxyethylene ether in a mass ratio of 5:1: 0.8) into a reaction kettle, heating to 60 ℃, fully stirring for 30 minutes, continuously heating to 80 ℃, adding 16 parts of isotetradecane under the stirring condition, continuously stirring for 30 minutes, then adding 8 parts of chitin phosphate prepared in preparation example 3, 4 parts of potassium sulfur octoate, 5 parts of polyether modified silicone oil ET203, 2.6 parts of polyhexadecyl methacrylate, and continuously stirring for 30 minutes to uniformly mix to obtain the lubricant.
Example 3
Adding 20 parts by weight of palm oil, 15 parts by weight of castor oil, 6 parts by weight of trimethylolpropane ricinoleate prepared in preparation example 1, 6 parts by weight of trimethylolpropane palmitoleate prepared in preparation example 2, 8 parts by weight of ethyl oleate, 4 parts by weight of potassium palmitoleate, 2 parts by weight of sodium abietate, 16 parts by weight of surfactant (Span80, a mixture of AEO-5 and isotridecanol polyoxyethylene ether in a mass ratio of 5:1.6: 0.5) into a reaction kettle, heating to 60 ℃, fully stirring for 30 minutes, continuously heating to 80 ℃, adding 11 parts by weight of isocetylalkane under the condition of stirring, continuously stirring for 30 minutes, then adding 5 parts by weight of chitin phosphate prepared in preparation example 3, 2 parts by weight of potassium thioctate, 3 parts by weight of polyether modified silicone oil ET203 and 1.5 parts by weight of hexadecyl polymethacrylate, and continuously stirring for 30 minutes to uniformly mix to obtain the lubricant.
Example 4
The other conditions were the same as in example 1 except that the vegetable fatty acid salt was 6 parts of potassium palmitoleate.
Example 5
The other conditions were the same as in example 1 except that the salt of vegetable fatty acid was 6 parts of sodium abietate.
Example 6
The other conditions were the same as in example 1 except that 12 parts of surfactants were Span80 and AEO-6 in a mass ratio of 5:1.5 of the mixture.
Example 7
The other conditions were the same as in example 1, except that 12 parts of the surfactant were a mixture of Span80 and isomeric tridecanol polyoxyethylene ether in a ratio of 5: 0.5.
Comparative example 1
The other conditions were the same as in example 1 except that no chitin phosphate was added.
Comparative example 2
The other conditions were the same as in example 1 except that potassium thioctate was not added.
Application example
The lubricants prepared in the above examples were subjected to the following performance tests, and the results are shown in table 1 below:
(1) lubrication Performance test
According to the standard of the medium petroleum enterprise: QSY17088-2018 liquid lubricant for drilling fluid is technically characterized in that two 400mL portions of fresh water-based slurry are prepared (0.53 g of anhydrous sodium carbonate and 15g of bentonite are added into 400mL of distilled water, after the mixture is stirred at a high speed for 20min, the mixture is sealed and maintained for 24h at the temperature of 25 ℃), 0.5wt% of lubricant prepared in the embodiment is added into one portion of the fresh water-based slurry, the other portion of the fresh water-based slurry is not added, the base slurry which is not added and the base slurry which is added are fully stirred at a high speed for 10min by a high-speed stirrer, and then an extreme pressure lubrication performance is tested by an extreme pressure lubrication instrument and the reduction rate R of a lubrication coefficient is calculated.
Wherein R represents a reduction ratio of a lubrication coefficient, K 0 Denotes the base stock lubrication coefficient, K 1 Indicating the coefficient of lubrication after the addition of the lubricant.
The reduction rates of the lubrication coefficients at 160 ℃ and 200 ℃ are respectively calculated by testing the base slurry and the slurry added with the lubricant after hot rolling for 16h at 160 ℃ and 200 ℃ under the same condition.
(2) Foaming test
Stirring the sample slurry in the step (1) for 10min at 11000r/min +/-300 rmin, pouring the foam of the non-sample-added base slurry and the sample-added base slurry which are communicated into a clean 1000mL glass measuring cylinder, reading the volume of the sample slurry after 10s, and calculating the foaming rate according to a foaming rate formula, wherein the test result is shown in Table 1.
Foaming ratio calculation formula:
foaming ratio of (V) Sample (A) –V Base of )/V Base (C) ×100％，
In the formula: v Sample (A) Volume of base stock to which lubricant is added, V Base of Is the volume of base slurry without lubricant added.
(3) Low temperature test
The freezing point is determined by a freezing point instrument according to the instrument operating instructions. Or weighing 50mL of the sample, putting the sample into a 100mL triangular flask, covering the opening of the triangular flask with a rubber plug inserted with a thermometer with the measuring range of-50 ℃ to + 50 ℃, paying attention to the insertion of the thermometer into liquid, putting the triangular flask into a refrigerator for freezing, and observing the temperature of the sample when the sample is solidified.
(4) Determination of surface tension
And (3) testing the surface tension of the anti-balling lubricant by adopting a platinum ring method according to the instrument operation instruction and the surface tension instrument operation instruction under the condition of 25 +/-1 ℃, and adding the slurry anti-balling lubricant into a sample cup for direct testing.
(5) Biodegradability test
The biotoxicity and the biodegradability of the anti-balling lubricant sample of the embodiment are tested according to the SY/T6788-010 water-soluble oilfield chemical environmental protection technical evaluation method, and the test result is as follows: EC in biotoxicity assay 50 Value greater than 1.0X 10 6 BOD in biodegradability test 5 the/CODcr is more than 0.3, which shows that the product is nontoxic and has better biodegradability.
Table 1 lubricant properties:
the data in Table 1 show that the lubricating agent prepared by the invention has good effects on the reduction rate of the lubricating coefficient, the condensation point, the foaming rate, the surface tension, the biotoxicity and the biodegradability through tests, and the anti-balling lubricating agent prepared by the formula is a good anti-balling lubricating product.
In conclusion, the lubricant disclosed by the invention can provide a drilling lubricant which has good lubrication performance, satisfactory lubrication performance at high temperature, low foaming rate, low condensation point and low surface tension on site, is low in biotoxicity and biodegradable, and is environment-friendly and excellent in comprehensive performance through the formula and the specific implementation method.
Claims (10)
1. The environment-friendly degradable drilling lubricant is characterized by comprising the following raw materials in parts by weight: 35-50 parts of vegetable base oil, 12-20 parts of trimethylolpropane vegetable fatty acid ester, 11-16 parts of isoparaffin, 8-12 parts of oleate, 10-14 parts of lipophilic nonionic surfactant, 4-8 parts of vegetable fatty acid salt, 5-8 parts of chitin phosphate, 2-4 parts of lipoate, 1.5-2.6 parts of pour point depressant and 3-5 parts of anti-foaming agent.
2. The well drilling lubricant of claim 1, wherein the vegetable base oil is selected from at least one of castor oil, soybean oil, palm oil, rapeseed oil, peanut oil, linseed oil, olive oil, sunflower oil.
3. The drilling lubricant according to claim 1, wherein the trimethylolpropane vegetable fatty acid ester is obtained by esterification of vegetable fatty acid and trimethylolpropane, and the vegetable fatty acid ester is at least one selected from ricinoleic acid, palmitoleic acid, soybean oleic acid and rapeseed oleic acid.
4. The well bore lubricant of claim 1, wherein the isoparaffin is selected from at least one of the isomeric dodecanes, isomeric tetradecanes, and isomeric hexadecanes; and/or
The oleate is selected from at least one of methyl oleate, ethyl oleate, propyl oleate, butyl oleate, amyl oleate, hexyl oleate and octyl oleate; and/or
The anti-foaming agent is a silicone oil anti-foaming agent, preferably polyether modified silicone oil, and has the viscosity of 500-1000 mpa.s.
5. The well drilling lubricant according to claim 1, wherein the salt of a vegetable fatty acid is a sodium and/or potassium salt of a vegetable fatty acid selected from at least one of ricinoleic acid, linolenic acid, oleic acid, linoleic acid, eleostearic acid, soya oleic acid, tall oil acid, coconut oleic acid, abietic acid, palmitoleic acid; preferably, the vegetable fatty acid salt is a mixture of palmityl oleate and abietate in a mass ratio of 4-6: 1-2.
6. The well drilling lubricant according to claim 1, wherein the lipophilic nonionic surfactant is sorbitan fatty acid ester (span), fatty alcohol polyoxyethylene ether (AEO) and isomeric alkyl alcohol polyoxyethylene ether in a mass ratio of 3-5: 1-1.6: 0.5-0.8, wherein the HLB value of the sorbitan fatty acid ester is 4-7, and the HLB value of the fatty alcohol-polyoxyethylene ether is 10-14; preferably, the sorbitan fatty acid ester is selected from at least one of Span40, Span60, Span 80; the polyoxyethylene ether of the fatty alcohol is selected from at least one of AEO-5, AEO-6, AEO-7, AEO-8 and AEO-9; the isomeric alkyl alcohol polyoxyethylene ether is selected from at least one of isomeric dodecyl alcohol polyoxyethylene ether, isomeric dodecyl alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether.
7. The drilling lubricant as recited in claim 1, wherein the chitin phosphate is prepared from chitin and phosphorus pentoxide in the presence of methanesulfonic acid, and the mass ratio of chitin to phosphorus pentoxide to methanesulfonic acid is 1: 1.3-1.8: 5-10; the deacetylation degree of the chitin is 80-95%;
further, the chitin phosphate is prepared by a preparation method comprising the following steps: dissolving chitin in methanesulfonic acid, slowly adding phosphorus pentoxide in ice water bath (0-5 deg.C), reacting for 2-4h, adding diethyl ether for precipitation, centrifuging, filtering, and washing to obtain the final product.
8. The drilling lubricant of claim 1, wherein the lipoate is selected from sodium lipoate and/or potassium lipoate.
9. The well drilling lubricant as claimed in claim 1, wherein the pour point depressant is a polymer having a long chain alkyl group in a side chain; preferably, the pour point depressant is long-chain alkyl (meth) acrylate or a polymer obtained by polymerizing N-long-chain alkyl (meth) acrylamide as a monomer, wherein the long-chain alkyl is an alkyl with 10-18 carbon atoms; more preferably, the long chain alkyl poly (meth) acrylate is selected from at least one of lauryl (meth) acrylate, tetradecyl (meth) acrylate, hexadecyl (meth) acrylate, and octadecyl (meth) acrylate; the poly N-long-chain alkyl acrylamide is selected from at least one of poly N-dodecyl acrylamide, N-tetradecyl methacrylamide and N-hexadecyl methacrylamide;
the molecular weight of the pour point depressant is 8000-20000, and the molecular weight dispersion index PDI is below 1.6.
10. The method for preparing a well lubricant according to any of claims 1 to 10, comprising the steps of:
adding plant base oil, oleate, plant fatty acid salt, plant fatty acid tribasic alcohol amine soap and lipophilic nonionic surfactant into a reaction kettle, heating to 50-60 ℃, fully stirring for 0.5-1h, heating to 60-80 ℃, then adding isoparaffin under the condition of stirring, continuously stirring for 0.5-1h, then adding chitin phosphate, lipoate, an antifoaming agent and a pour point depressant, continuously stirring for 0.5-1h, and uniformly mixing to obtain the final lubricant product.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116590069A (en) * | 2023-05-24 | 2023-08-15 | 中国科学院兰州化学物理研究所 | Lubricant with mechanical self-adaption as well as preparation method and application thereof |
| CN116590069B (en) * | 2023-05-24 | 2024-06-11 | 中国科学院兰州化学物理研究所 | Lubricant with mechanical self-adaption as well as preparation method and application thereof |
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| CN116590069A (en) * | 2023-05-24 | 2023-08-15 | 中国科学院兰州化学物理研究所 | Lubricant with mechanical self-adaption as well as preparation method and application thereof |
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| CN115093838B (en) | 2023-02-21 |
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