CN112175591A - Efficient temperature-resistant salt-resistant lubricant for drilling fluid and production and detection methods thereof - Google Patents
Efficient temperature-resistant salt-resistant lubricant for drilling fluid and production and detection methods thereof Download PDFInfo
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- 239000000314 lubricant Substances 0.000 title claims abstract description 65
- 150000003839 salts Chemical class 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 239000012530 fluid Substances 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 107
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims abstract description 42
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims abstract description 42
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims abstract description 42
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000005642 Oleic acid Substances 0.000 claims abstract description 42
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims abstract description 42
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000010426 asphalt Substances 0.000 claims abstract description 38
- 239000010779 crude oil Substances 0.000 claims abstract description 23
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 21
- 239000011780 sodium chloride Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 230000001050 lubricating effect Effects 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 24
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 13
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 13
- 239000000194 fatty acid Substances 0.000 claims description 13
- 229930195729 fatty acid Natural products 0.000 claims description 13
- 239000000600 sorbitol Substances 0.000 claims description 13
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 11
- 239000004202 carbamide Substances 0.000 claims description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 9
- 239000001110 calcium chloride Substances 0.000 claims description 9
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 9
- -1 fatty acid ester Chemical class 0.000 claims description 9
- 230000001804 emulsifying effect Effects 0.000 claims description 8
- 238000005461 lubrication Methods 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- SECPZKHBENQXJG-UHFFFAOYSA-N cis-palmitoleic acid Natural products CCCCCCC=CCCCCCCCC(O)=O SECPZKHBENQXJG-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000005886 esterification reaction Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- NNNVXFKZMRGJPM-KHPPLWFESA-N sapienic acid Chemical compound CCCCCCCCC\C=C/CCCCC(O)=O NNNVXFKZMRGJPM-KHPPLWFESA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- LKOVPWSSZFDYPG-WUKNDPDISA-N trans-octadec-2-enoic acid Chemical compound CCCCCCCCCCCCCCC\C=C\C(O)=O LKOVPWSSZFDYPG-WUKNDPDISA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 12
- 229910001424 calcium ion Inorganic materials 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 239000007790 solid phase Substances 0.000 description 10
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 230000032683 aging Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 235000013311 vegetables Nutrition 0.000 description 5
- 150000001408 amides Chemical class 0.000 description 4
- 239000010428 baryte Substances 0.000 description 4
- 229910052601 baryte Inorganic materials 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 150000004668 long chain fatty acids Chemical class 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000003385 sodium Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/30—Oils, i.e. hydrocarbon liquids for lubricating properties
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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Abstract
The invention discloses a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid and a production and detection method thereof, wherein the lubricant is prepared from industrial oleic acid, emulsified plant asphalt, crude oil, a water-soluble regulator and softened water; the detection method comprises the steps of preparation of base slurry for detection, preparation of sodium chloride pollution slurry, detection and the like; the invention has the advantages that: the anti-pollution capability is strong, the high temperature resistance is excellent, the friction resistance can be effectively reduced in the high-density drilling fluid, and the filtration loss of the test slurry can be reduced to a certain extent.
Description
Technical Field
The invention relates to a lubricant, in particular to a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid and a production and detection method thereof, belonging to the field of lubricants.
Background
Most of the current commercially available temperature-resistant and salt-resistant lubricants aim at resisting high temperature and salt resistance of fresh water slurry, but the lubricants can be used in high-density drilling fluid while meeting the two indexes, and the fluid loss of the test slurry can be increased due to the characteristics of the liquid lubricants, and especially almost all the liquid lubricants in the high-density slurry can not reduce the fluid loss of the test slurry.
Disclosure of Invention
In order to solve the problems, the invention designs the efficient temperature-resistant and salt-resistant lubricant for the drilling fluid and the production and detection methods thereof, the high-efficiency temperature-resistant and salt-resistant lubricant has strong pollution resistance and excellent high-temperature resistance, can effectively reduce friction resistance in the high-density drilling fluid, and can reduce the filtration loss of test slurry to a certain extent.
The technical scheme of the invention is as follows:
the efficient temperature-resistant salt-resistant lubricant for the drilling fluid is prepared from the following raw materials in parts by weight:
the feed is prepared from the following raw materials in parts by weight:
30-40 parts of industrial oleic acid, 10-15 parts of emulsified plant asphalt, 20 parts of crude oil, 8 parts of water-soluble regulator and 7-22 parts of softened water;
the industrial oleic acid is hexadecenoic acid to octadecenoic acid or a mixture thereof;
the crude oil comprises light crude oil with water content less than 0.5%;
the emulsified plant asphalt is prepared by carrying out esterification reaction on plant asphalt and sorbitol at 200 ℃ under the condition of a catalyst to generate higher fatty acid ester, so that the emulsified plant asphalt has emulsifying property, and has more emulsifying property compared with common plant asphalt;
the water-soluble regulator is agricultural urea;
the softened water is water with the hardness of 0.
Crude oil plays a good defoaming role in the formula of the lubricant, and because oleic acid and emulsified vegetable asphalt have the problem of high foaming rate, proper crude oil is added in the formula to control the foaming rate of a finished product.
The main role of the demineralized water in the present invention is to dissolve the additive urea, since urea is an oil insoluble substance and the reaction of oleic acid with urea must be reacted in water.
A production method of a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid comprises the following steps:
s1, adding 35-40 parts of industrial oleic acid into a reaction container, adding 15-25 parts of emulsified plant asphalt, adding 20 parts of crude oil after uniformly stirring, and finally uniformly stirring all the materials;
s2, adding 8 parts of water-soluble regulator into another reaction container, adding 7-22 parts of softened water, and uniformly stirring all the materials;
s3, slowly adding the mixed liquid obtained in the step S2 into the mixed liquid obtained in the step S1, and stirring for 40min at normal temperature to obtain the finished lubricant.
The industrial oleic acid and urea are subjected to chemical reaction in water at normal temperature to form a special amide substance, and the substance can further react at high temperature to form a more stable amide structure, and the specific reaction is as follows:
reaction at normal temperature
The reaction at high temperature, the bottom hole temperature is increased along with the increase of the well depth, and the following chemical reaction occurs when the temperature exceeds 120 ℃:
the lubricating asphalt accounts for 15-25 parts, the product of reaction (S1) accounts for 40-50 parts, the crude oil accounts for 10-20 parts, and the rest is water, when the temperature of the product of reaction (S1) exceeds 120 ℃ during the downhole operation of the finished lubricant, the reaction (S2) continues to react, and the components of the lubricant comprise the product of reaction (S2) accounts for 40-50 parts, the emulsified vegetable asphalt accounts for 15-25 parts, the crude oil accounts for 10-20 parts, and the rest is water.
The action principle is as follows: compared with the traditional lubricant which is added with a large amount of emulsifier to improve the temperature resistance, the lubricant provided by the invention has the advantages that the lubricating effect is improved by two parts:
(1) the emulsified plant asphalt is obtained by reacting plant asphalt and sorbitol serving as raw materials, the higher fatty acid in the plant asphalt reacts with the sorbitol to generate the higher fatty acid sorbitol ester with extremely strong emulsifying property and high lubricating property, and the generated higher fatty acid sorbitol ester has an adhesion effect due to the characteristics of the higher fatty acid, so that the higher fatty acid sorbitol ester can be adhered to the surfaces of solid phase particles in the drilling fluid, the used solid phase particles are wrapped, the charges on the surfaces of the solid phase particles are reduced, and meanwhile, the solid phase particles are converted into a solid lubricant structure, so that the friction resistance coefficient of a system can be greatly reduced, the sedimentation speed of the solid phase particles in the system is reduced, and the filtration loss of the system can be reduced to a certain extent. Therefore, in high-density slurry or in water, the barite particles can be wrapped into a solid lubricant, so that the barite can be better suspended in the water containing the lubricant;
(2) the industrial oleic acid has good lubricating property, but the oleic acid belongs to water-insoluble acid because the oleic acid belongs to long-chain fatty acids, and the oleic acid serving as a lubricant has extremely poor salt resistance and calcium resistance, so that the phenomenon that the oleic acid cannot be dissolved in water can be effectively improved by adding the additive, and the lubricating property of the oleic acid cannot be influenced.
A detection method of a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid comprises the following steps:
(1) preparation of base slurry for detection: adding 0.2g of anhydrous sodium carbonate (analytically pure) into 400ml of distilled water, stirring until the anhydrous sodium carbonate is completely dissolved, adding 20.0g of experimental sodium soil, stirring at 11000r/min at a high speed for 20min, and sealing and maintaining for 24h at 24 ℃;
(2) preparing sodium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 145g of analytically pure sodium chloride, and stirring at a high speed of 11000r/min for 20min to prepare saturated sodium chloride polluted slurry;
(3) preparing calcium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 1.1g of analytically pure calcium chloride into the base slurry, and stirring at a high speed of 11000r/min for 20min to prepare 1000mg/L calcium chloride polluted slurry;
(4) respectively taking 2 parts of the base slurry in the steps (1), (2) and (3), adding 2.0mL of a lubricant sample into one part of the base slurry, taking the other part of the base slurry as a blank, respectively carrying out hot rolling for 16h at room temperature, 100 ℃, 120 ℃, 150 ℃, 180 ℃ and 200 ℃, taking out the blank, cooling the blank to the room temperature, calculating the reduction rate of the lubricating coefficient according to a formula (1), and respectively measuring the torque readings of the base slurry and the sample adding slurry at the pressure of 0.7 MPa (150 inch lbf torque, 1.5inch arm) and the rotating speed of 60 r/min by using an extreme pressure lubricating instrument under the room temperature condition; and calculating the reduction rate of the lubrication coefficient according to formula 1:
in the formula:
r-reduction of lubrication coefficient,%;
K0-Torque reading of base stock;
K1-Torque reading of the loaded slurry;
(5) taking the base slurry obtained in the step (1), respectively adding high-density barite powder to adjust the density of the base slurry to 2.3g/cm3Taking two parts, adjusting the density to 2.3g/cm3Taking one of the test slurries to add 1.0% of the lubricant sample of the invention, taking the other as a blank test slurry, and respectively adding the blank test slurry and the sample slurry at a high speedStirring for 10min, pressing mud cakes for 20min under the condition of 4.0MPa by using a friction coefficient instrument, adsorbing an adhesion disc and the mud cakes at the pressure of 5.0MPa after the mud cakes are pressed, wherein the adsorption time is 10min, measuring the torque of blank slurry and sample slurry by using a torque instrument, and calculating the reduction rate of the adhesion coefficient of the sample according to a formula (2):
1. the anti-pollution capacity is strong, compared with the commercially available temperature-resistant and salt-resistant lubricant, the lubricant provided by the invention has the advantages that the anti-saturated salt pollution capacity is obviously improved, and the reduction rate of the lubricating coefficient in 1000mg/L calcium ion polluted slurry is more than 5 times higher than that of the commercially available temperature-resistant and salt-resistant lubricant;
2. the high-temperature resistance performance is excellent, the performance is almost unchanged after aging at 200 ℃, especially the lubricating performance is almost not reduced after the calcium ion polluted slurry is aged, and the commercially available temperature-resistant and salt-resistant lubricant is invalid;
3. the friction resistance can be effectively reduced in the high-density drilling fluid;
4. the filtration loss of the test slurry can be reduced to a certain extent.
The invention is further illustrated by the following figures and examples.
Drawings
FIG. 1 is a comparison of the performance of the same type of lubricant according to the present invention;
FIG. 2 is a comparison of the performance of lubricants of the same type in high density test slurries according to examples of the present invention;
FIG. 3 is a comparison of the high temperature resistance of the same type of lubricant according to embodiments of the present invention;
FIG. 3-1 is a comparison of the high temperature resistance of lubricants of the same type in saturated brine slurries according to examples of the present invention;
3-2 are graphs comparing the high temperature resistance of the same type of lubricant in 1000mg/L calcium ion contaminated slurry according to the present invention;
FIG. 4 is a graph showing the effect of the amount of oleic acid added on the high temperature resistance of a test sample according to an embodiment of the present invention;
FIG. 5 is a graph showing the effect of the amount of oleic acid added on the salt and high temperature resistance of a sample according to an embodiment of the present invention;
FIG. 6 is a graph showing the effect of the amount of oleic acid added on the calcium ion contamination resistance of a sample according to an embodiment of the present invention;
FIG. 7 is a graph showing the effect of oleic acid loading on the lubricating properties of a sample in a high density test slurry according to an embodiment of the present invention;
FIG. 8 is a graph showing the effect of the amount of emulsified plant asphalt on the high temperature resistance of a test sample according to an embodiment of the present invention;
FIG. 9 is a graph showing the effect of the amount of oleic acid added on the salt and high temperature resistance of a sample according to an embodiment of the present invention;
FIG. 10 is a graph showing the effect of oleic acid addition on the calcium ion contamination resistance of a sample according to an embodiment of the present invention;
FIG. 11 is a graph showing the effect of the amount of emulsified plant asphalt added on the calcium ion contamination resistance of a sample according to an embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
The efficient temperature-resistant salt-resistant lubricant for the drilling fluid is prepared from the following raw materials in parts by weight:
30-40 parts of industrial oleic acid, 10-15 parts of emulsified plant asphalt, 20 parts of crude oil, 8 parts of water-soluble regulator and 7-22 parts of softened water;
the industrial oleic acid is hexadecenoic acid to octadecenoic acid or a mixture thereof;
the crude oil comprises light crude oil with water content less than 0.5%;
the emulsified plant asphalt is prepared by carrying out esterification reaction on plant asphalt and sorbitol at 200 ℃ under the condition of a catalyst to generate higher fatty acid ester, so that the emulsified plant asphalt has emulsifying property, and has more emulsifying property compared with common plant asphalt;
the water-soluble regulator is agricultural urea;
the softened water is water with the hardness of 0.
Crude oil plays a good defoaming role in the formula of the lubricant, and because oleic acid and emulsified vegetable asphalt have the problem of high foaming rate, proper crude oil is added in the formula to control the foaming rate of a finished product.
The main role of the demineralized water in the present invention is to dissolve the additive (urea), since urea is an oil-insoluble substance and the reaction of oleic acid with urea must be carried out in water.
A production method of a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid comprises the following steps:
s1, adding 35-40 parts of industrial oleic acid into a reaction container, adding 15-25 parts of emulsified plant asphalt, adding 20 parts of crude oil after uniformly stirring, and finally uniformly stirring all the materials;
s2, adding 8 parts of water-soluble regulator into another reaction container, adding 7-22 parts of softened water, and uniformly stirring all the materials;
s3, slowly adding the mixed liquid obtained in the step S2 into the mixed liquid obtained in the step S1, and stirring for 40min at normal temperature to obtain the finished lubricant.
The industrial oleic acid and urea are subjected to chemical reaction in water at normal temperature to form a special amide substance, and the substance can further react at high temperature to form a more stable amide structure, and the specific reaction is as follows:
reaction at normal temperature
The action principle is as follows: compared with the traditional lubricant which is added with a large amount of emulsifier to improve the temperature resistance, the lubricant provided by the invention has the advantages that the lubricating effect is improved by two parts:
(1) the emulsified plant asphalt is obtained by reacting plant asphalt and sorbitol serving as raw materials, the higher fatty acid in the plant asphalt reacts with the sorbitol to generate the higher fatty acid sorbitol ester with extremely strong emulsifying property and high lubricating property, and the generated higher fatty acid sorbitol ester has an adhesion effect due to the characteristics of the higher fatty acid, so that the higher fatty acid sorbitol ester can be adhered to the surfaces of solid phase particles in the drilling fluid, the used solid phase particles are wrapped, the charges on the surfaces of the solid phase particles are reduced, and meanwhile, the solid phase particles are converted into a solid lubricant structure, so that the friction resistance coefficient of a system can be greatly reduced, the sedimentation speed of the solid phase particles in the system is reduced, and the filtration loss of the system can be reduced to a certain extent. Therefore, in high-density slurry or in water, the barite particles can be wrapped into a solid lubricant, so that the barite can be better suspended in the water containing the lubricant;
(2) the industrial oleic acid has good lubricating property, but the oleic acid belongs to water-insoluble acid because the oleic acid belongs to long-chain fatty acids, and the oleic acid serving as a lubricant has extremely poor salt resistance and calcium resistance, so that the phenomenon that the oleic acid cannot be dissolved in water can be effectively improved by adding the additive, and the lubricating property of the oleic acid cannot be influenced.
A detection method of a high-efficiency temperature-resistant salt-resistant lubricant for drilling fluid comprises the following steps:
(1) preparation of base slurry for detection: adding 0.2g of anhydrous sodium carbonate (analytically pure) into 400ml of distilled water, stirring until the anhydrous sodium carbonate is completely dissolved, adding 20.0g of experimental sodium soil, stirring at 11000r/min at a high speed for 20min, and sealing and maintaining for 24h at 24 ℃;
(2) preparing sodium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 145g of analytically pure sodium chloride, and stirring at a high speed of 11000r/min for 20min to prepare saturated sodium chloride polluted slurry;
(3) preparing calcium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 1.1g of analytically pure calcium chloride into the base slurry, and stirring at a high speed of 11000r/min for 20min to prepare 1000mg/L calcium chloride polluted slurry;
(4) respectively taking 2 parts of the base slurry (the bentonite slurry for test) in the steps (1), (2) and (3), adding 2.0mL of a lubricant sample into one part of the base slurry, taking the other part as a blank, respectively hot rolling the blank at room temperature, 100 ℃, 120 ℃, 150 ℃, 180 ℃ and 200 ℃ for 16h, taking out the blank, cooling the blank to the room temperature, calculating the reduction rate of the lubricating coefficient according to a formula (1), and respectively measuring the torque readings of the base slurry and the sample-added slurry at 0.7 MPa (150 inch lbf moment, 1.5inch moment arm) pressure and 60 r/min rotating speed by using an extreme pressure lubricating instrument under the room temperature condition; and calculating the reduction rate of the lubrication coefficient according to formula 1:
in the formula:
r-reduction of lubrication coefficient,%;
K0-Torque reading of base stock;
K1-Torque reading of the loaded slurry;
(5) taking the base slurry obtained in the step (1), respectively adding high-density barite powder to adjust the density of the base slurry to 2.3g/cm3Taking two parts, adjusting the density to 2.3g/cm3Taking one part of the test slurry to be added with 1.0 percent of the lubricant sample, taking the other part of the test slurry as a blank test slurry, respectively stirring the blank test slurry and the sample adding slurry at a high speed for 10min, pressing a mud cake for 20min by using a friction coefficient instrument under the condition of 4.0MPa, adsorbing an adhesive disc and the mud cake at the pressure of 5.0MPa after the mud cake is pressed, wherein the adsorption time is 10min, measuring the torque of the blank slurry and the sample adding slurry by using a torque instrument, and calculating the reduction rate of the adhesion coefficient of the sample according to a formula (2):
in the formula:
a-reduction of coefficient of lubrication,%;
T0-Torque reading for base stock;
T1-Torque reading of the loaded slurry.
As shown in figure 1, in the aspect of lubricating property in fresh water slurry, the lubricant disclosed by the invention has relatively better performance compared with other commercially available lubricants, and has obvious advantages in the aspect of reduction rate of lubricating coefficient in saturated sodium chloride polluted slurry, and the reduction rate of lubricating coefficient of the lubricant disclosed by the invention in 1000mg/L calcium ion polluted slurry is more than 5 times higher than that of other products of the same type.
As shown in FIG. 2, the lubricant of the present invention has a significantly better reduction of the coefficient of friction in the high density test slurry than other products of the same type and a significantly lower fluid loss in the test slurry than other products of the same type.
As shown in FIG. 3, the performance of the inventive lubricant after high temperature aging changes significantly less than other similar types of products; as shown in fig. 3-1, only the commercially available temperature-resistant and salt-resistant lubricant 3 has little change in performance after aging at different temperatures than the lubricant of the present invention, and other similar products have their lubricating performance reduced with increasing temperature, but the lubricant of the present invention has a lubricating performance significantly higher than that of other similar products (at various temperatures) in saturated sodium chloride contaminated slurry; as shown in figure 3-2, the lubricating performance of the lubricant of the invention in 1000mg/L calcium ion polluted slurry hardly changes along with the increase of aging temperature, and the lubricating performance of the commercially available products of the same type is sharply reduced along with the increase of aging temperature, and the products are totally ineffective at the temperature of more than 150 ℃.
Experimental example 1:
the additive amount in the fixed formula is 8 parts, the crude oil amount is 20 parts, the emulsified plant asphalt amount is 25 parts, the oleic acid amount is 35 parts, 36 parts, 37 parts, 38 parts, 39 parts and 40 parts respectively, the rest parts are supplemented by softened water, and the lubricating coefficient reduction rate and the adhesion coefficient reduction rate in weighted slurry at various temperatures in the fresh water slurry, the saturated saline water slurry and the 1000mg/L calcium ion polluted slurry of the sample are respectively detected. The specific experimental results are as follows:
as shown in FIG. 4, the lubricating properties of the samples increased significantly with the increase in the amount of oleic acid, and the high temperature resistance of the samples did not change much with the increase in the amount of oleic acid.
As shown in fig. 5, the lubricating properties of the samples in the saturated salt-contaminated slurry increased significantly with the increase in the amount of oleic acid, and the lubricating properties of the samples in the saturated sodium chloride-contaminated slurry did not change much with the increase in the amount of oleic acid.
As shown in FIG. 6, the change in the amount of oleic acid added had little effect on the lubricity of the sample in 1000mg/L calcium ion-contaminated slurry.
As shown in FIG. 7, the fluid loss and the rate of decrease in the friction coefficient of the test slurry were unchanged as the amount of oleic acid added was increased.
Experimental example 2:
the additive amount in the fixed formula is 8 parts, the crude oil amount is 20 parts, the oleic acid amount is 38 parts, the emulsified plant asphalt amounts are 25 parts, 27 parts, 29 parts, 31 parts, 33 parts and 35 parts respectively, the rest parts are supplemented by softened water, and the lubricating coefficient reduction rate and the adhesion coefficient reduction rate in the weighted slurry at each temperature in the fresh water slurry, the saturated saline water slurry and the 1000mg/L calcium ion polluted slurry of the sample are respectively detected. The specific experimental results are as follows:
as shown in FIG. 8, the high temperature resistance of the test specimen was not affected by the addition of the emulsified plant asphalt.
As shown in FIG. 9, the addition of the emulsified plant asphalt had no effect on the high temperature resistance and salt resistance of the test specimens.
As shown in FIG. 10, the resistance of the test sample to calcium ion contamination increased with the increase of the amount of the emulsified plant pitch, and the stability of the test sample in the calcium ion contaminated slurry increased with the increase of the aging temperature.
As shown in fig. 11, the decrease rate of the friction coefficient of the sample in the high-density drilling fluid increases and the fluid loss decreases as the amount of the emulsified vegetable asphalt increases.
Claims (3)
1. The efficient temperature-resistant salt-resistant lubricant for the drilling fluid is characterized by being prepared from the following raw materials in parts by weight:
30-40 parts of industrial oleic acid, 10-15 parts of emulsified plant asphalt, 20 parts of crude oil, 8 parts of water-soluble regulator and 7-22 parts of softened water;
the industrial oleic acid is hexadecenoic acid to octadecenoic acid or a mixture thereof;
the crude oil comprises light crude oil with water content less than 0.5%;
the emulsified plant asphalt is prepared by carrying out esterification reaction on plant asphalt and sorbitol at 200 ℃ under the condition of a catalyst to generate higher fatty acid ester, so that the emulsified plant asphalt has emulsifying property, and has more emulsifying property compared with common plant asphalt;
the water-soluble regulator is agricultural urea;
the softened water is water with the hardness of 0.
2. The method for producing the high-efficiency temperature-resistant salt-resistant lubricant for the drilling fluid according to claim 1, which comprises the following steps:
s1, adding 35-40 parts of industrial oleic acid into a reaction container, adding 15-25 parts of emulsified plant asphalt, adding 20 parts of crude oil after uniformly stirring, and finally uniformly stirring all the materials;
s2, adding 8 parts of water-soluble regulator into another reaction container, adding 7-22 parts of softened water, and uniformly stirring all the materials;
s3, slowly adding the mixed liquid obtained in the step S2 into the mixed liquid obtained in the step S1, and stirring for 40min at normal temperature to obtain the finished lubricant.
3. The method for detecting the high-efficiency temperature-resistant salt-resistant lubricant for the drilling fluid, which is disclosed by claim 1, comprises the following steps of:
(1) preparation of base slurry for detection: adding 0.2g of anhydrous sodium carbonate (analytically pure) into 400ml of distilled water, stirring until the anhydrous sodium carbonate is completely dissolved, adding 20.0g of experimental sodium soil, stirring at 11000r/min at a high speed for 20min, and sealing and maintaining for 24h at 24 ℃;
(2) preparing sodium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 145g of analytically pure sodium chloride, and stirring at a high speed of 11000r/min for 20min to prepare saturated sodium chloride polluted slurry;
(3) preparing calcium chloride polluted slurry: taking 400mL of the base slurry which is cured for 24 hours in the step (1), respectively adding 1.1g of analytically pure calcium chloride into the base slurry, and stirring at a high speed of 11000r/min for 20min to prepare 1000mg/L calcium chloride polluted slurry;
(4) respectively taking 2 parts of the base slurry in the steps (1), (2) and (3), adding 2.0mL of a lubricant sample into one part of the base slurry, taking the other part of the base slurry as a blank, respectively carrying out hot rolling for 16h at room temperature, 100 ℃, 120 ℃, 150 ℃, 180 ℃ and 200 ℃, taking out the blank, cooling the blank to the room temperature, calculating the reduction rate of the lubricating coefficient according to a formula (1), and respectively measuring the torque readings of the base slurry and the sample adding slurry at the pressure of 0.7 MPa (150 inch lbf torque, 1.5inch arm) and the rotating speed of 60 r/min by using an extreme pressure lubricating instrument under the room temperature condition; and calculating the reduction rate of the lubrication coefficient according to formula 1:
in the formula:
r-reduction of lubrication coefficient,%;
K0-Torque reading of base stock;
K1-Torque reading of the loaded slurry;
(5) taking the base slurry obtained in the step (1), respectively adding high-density barite powder to adjust the density of the base slurry to 2.3g/cm3Taking two parts, adjusting the density to 2.3g/cm3Taking one part of the test slurry to be added with 1.0 percent of the lubricant sample, taking the other part of the test slurry as a blank test slurry, respectively stirring the blank test slurry and the sample adding slurry at a high speed for 10min, pressing a mud cake for 20min by using a friction coefficient instrument under the condition of 4.0MPa, adsorbing an adhesive disc and the mud cake at the pressure of 5.0MPa after the mud cake is pressed, wherein the adsorption time is 10min, measuring the torque of the blank slurry and the sample adding slurry by using a torque instrument, and calculating the reduction rate of the adhesion coefficient of the sample according to a formula (2):
in the formula:
a-reduction of coefficient of lubrication,%;
T0-Torque reading for base stock;
T1-Torque reading of the loaded slurry.
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| CN114181675A (en) * | 2021-12-29 | 2022-03-15 | 新疆丰茗科技有限公司 | Efficient composite lubricant for drilling fluid and preparation method thereof |
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