CN111484835A - Water-soluble oil-based drilling fluid lubricant and preparation method thereof - Google Patents
Water-soluble oil-based drilling fluid lubricant and preparation method thereof Download PDFInfo
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- CN111484835A CN111484835A CN202010328101.7A CN202010328101A CN111484835A CN 111484835 A CN111484835 A CN 111484835A CN 202010328101 A CN202010328101 A CN 202010328101A CN 111484835 A CN111484835 A CN 111484835A
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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
- 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
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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
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
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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
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Abstract
The invention discloses a water-soluble oil-based drilling fluid lubricant and a preparation method thereof. The raw materials of the lubricant are mixed liquid consisting of industrial oleic acid, crude oil, an additive and industrial ethanol; wherein the mass fraction of the industrial oleic acid is 30-35%; 50-60% of crude oil and 5-10% of additive by weight; the mass portion of the industrial ethanol is 5 percent.
Description
Technical Field
The invention relates to the technical field of chemical production, in particular to a water-soluble oil-based drilling fluid lubricant.
Background
The conventional oil-based lubricant is prepared by adding a certain amount of oil-soluble substances with lubricating effect into a large amount of mineral oil or vegetable oil and mixing, so that the conventional oil-based lubricant cannot be dissolved or dispersed in a water-based drilling fluid, the conventional oil-based lubricant is usually stirred at a high speed and the like to form fine oil drops, the oil drops formed by the conventional oil-based lubricant are dispersed and form a 'false emulsification' phenomenon in the drilling fluid by continuous stirring, and the 'false emulsification' phenomenon is immediately destroyed once stirring is stopped or high temperature, high salinity and other conditions are met, so that the original lubricating effect of the lubricant is lost.
Disclosure of Invention
Aiming at the problems, the invention provides a water-soluble oil-based drilling fluid lubricant which can be dissolved in water-based drilling fluid, can greatly prolong the service life of the lubricant in the water-based drilling fluid, and has strong lubricating property and low foaming.
Meanwhile, the invention also provides a preparation method of the water-soluble oil-based drilling fluid lubricant with simple production process.
The technical scheme of the invention is as follows:
the invention provides a water-soluble oil-based drilling fluid lubricant, which is prepared from a mixed solution of industrial oleic acid, crude oil, an additive and industrial ethanol as raw materials; the mass portion of the industrial oleic acid is 30-35%; 50-60% of crude oil and 5-10% of additive by weight; the mass portion of the industrial ethanol is 5 percent.
Further, the mass portion of the industrial oleic acid is 32%; 55% of crude oil and 8% of additive; the mass portion of the industrial ethanol is 5 percent.
Further, the additive is tetramethylammonium hydroxide crystal containing 5 crystal water or tertiary amine such as dodecyldimethylamine and tributylamine.
Further, the industrial oleic acid is one or a mixture of any one of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
Further, the crude oil is light crude oil with water content less than 0.5%.
The invention also provides a preparation method of the water-soluble oil-based drilling fluid lubricant, which comprises the following steps:
s1, adding 30-35% of industrial oleic acid solution into a reaction container, and adding 50-60% of crude oil into the reaction container to obtain a mixed solution A;
s2, adding 5-10% of additive into another reaction container, adding 5% of industrial ethanol into the reaction container, and stirring at normal temperature until the additive is completely dissolved to obtain a mixed solution B;
s3, slowly adding the mixed solution A obtained in the step S2 into the mixed solution B obtained in the step S1, and stirring at normal temperature for 30min to generate the lubricant.
Further, the additive is tetramethylammonium hydroxide crystal containing 5 crystal water or tertiary amine substances such as dodecyl dimethyl amine, tributylamine and the like; wherein, the tertiary amine substance can react with carboxylic acid or amide substance under specific conditions to generate corresponding quaternary ammonium salt.
Further, the industrial oleic acid is one or a mixture of any one of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
Further, the crude oil is light crude oil with water content less than 0.5%.
The action principle in the use process is as follows: the additive (tertiary amine substance) and oleic acid can quickly produce chemical reaction to produce quaternary ammonium salt after contacting in water, but under the condition of no water, the additive and oleic acid do not produce reaction, and when the lubricant is added into the well, the lubricant can produce "chemical reaction" when meeting water "
RCOOH+(NH)4N-→RCOON(NH)4(1)
The additive and industrial oleic acid are subjected to chemical reaction according to the reaction (1) in the presence of water, and the lubricating property of the oleic acid can be further improved by the reaction product, so that the condition that the oleic acid cannot be dissolved in water is changed, and therefore, the lubricating property of the sample can be greatly improved by the product of the reaction (1), and the stability of the sample in fresh water slurry and the lubricating property and stability of the sample in salt water slurry can also be improved. Crude oil is used as a water-insoluble oil, but has good defoaming capability, so that crude oil is introduced in the invention to reduce the foaming rate of the finished lubricant, and industrial ethanol is used for dissolving tetramethylammonium hydroxide crystals.
The invention has the beneficial effects that:
1. the lubricating property is high, and the service cycle is long; compared with the traditional oil-based lubricant, the lubricant adopted by the invention has obviously improved lubricating performance, and the service life of the lubricant in the water-based drilling fluid is greatly prolonged compared with the traditional oil-based lubricant.
2. The salt resistance is good; compared with the traditional oil-based lubricant, the lubricating performance of the lubricant in 4% sodium chloride polluted slurry is obviously improved.
3. The stability is good; the lubricant disclosed by the invention is excellent in stability in a water-based drilling fluid (the lubricating property is hardly changed after standing for 72 h), and the lubricating property is hardly changed after standing for 72h in sodium chloride polluted slurry.
Drawings
FIG. 1 is a graph comparing the measurement of foaming rate and the reduction of the lubrication factor in a base stock for lubricants of the present invention with commercially available lubricants;
FIG. 2 is a graph comparing the detection of the rate of reduction of the lubricity coefficient of lubricants of the present invention with commercially available lubricants in a saline slurry;
FIG. 3 is a graph comparing the stability tests of the lubricants of the present invention with commercially available lubricants in fresh water slurries;
FIG. 4 is a graph comparing stability tests in saline slurries of lubricants of the present invention with commercially available lubricants;
FIG. 5 is a comparison graph of the life cycle of a lubricant of the present invention versus a commercially available lubricant in an indoor simulated oilfield field drilling environment;
FIG. 6 is a graph showing the performance of the lubricant prepared in the first example according to the mass fraction of industrial oleic acid in a fresh water slurry environment;
FIG. 7 is a graph of the performance of the lubricant prepared in the first example as a function of the mass fraction of technical oleic acid in a 4% salt aqueous slurry environment;
FIG. 8 is a graph showing the performance of the lubricant prepared in example two as a function of the mass fraction of the additive in a fresh water slurry environment;
FIG. 9 is a graph showing the performance of the lubricant prepared in the second embodiment according to the mass portion of the additive in a 4% saline slurry environment.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
In order to verify the performance of the lubricant, the performance of the lubricant is compared and tested with the existing commercial lubricant by the following method:
A. preparing 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 the temperature of 24 ℃.
B. And B, detecting the foaming rate and the reduction rate of the lubricating coefficient in the base slurry, namely taking 400m L of the base slurry cured in the step A, adding a lubricant sample of the invention 2.0m L, stirring at a high speed (the rotating speed is 11000r/min) for 5.0min (simultaneously carrying out blank test), measuring the foaming rate of the sample slurry, and respectively measuring the torque readings of the base slurry and the sample slurry under the pressure of 0.7MPa (50inch lbf moment, 1.5inch moment arm) and the rotating speed of 60r/min by using an extreme pressure lubricating instrument, and calculating the reduction rate of the lubricating coefficient according to a formula 1.
In the formula:
r-reduction of lubrication coefficient,%;
K0-torque reading of the base stock;
K1-torque reading of the sample application slurry.
The three commercially available lubricants were tested for basestock performance according to procedure B, and it can be seen from figure 1 that the inventive lubricants exhibited significantly lower foaming and significantly higher reduction in coefficient of lubricity than the three commercially available lubricants.
C. And B, detecting the reduction rate of the lubricating coefficient in the saline slurry, namely taking 400ml of the cured base slurry in the step A, adding 16.0g of analytically pure sodium chloride into each% of the base slurry, stirring at a high speed (the rotating speed is 11000r/min) for 5.0min, wherein the analytically pure sodium chloride is used for polluting the base slurry, adding 2.0m L of a lubricating agent into one% of the 4% of the sodium chloride polluted base slurry (the saline slurry), taking the other% of the sodium chloride polluted base slurry as a blank, respectively stirring the sample-added slurry and the blank slurry at a high speed (the rotating speed is 11000r/min) for 10.0min, respectively measuring the torque readings of the base slurry and the sample-added slurry at 0.7MPa (150inch lbf torque, 1.5inch arm) pressure and 60r/min by using an extreme pressure lubricating instrument, and calculating the reduction rate of the lubricating coefficient according to a.
The performance test of the three lubricants sold in the market in the basic slurry polluted by sodium chloride is carried out according to the process C, and as can be seen from the graph 2, the reduction rate of the lubricating coefficient of the lubricant disclosed by the invention in the 4% saline slurry is obviously higher than that of the lubricant sold in the market.
D. And (3) detecting the stability in the fresh water slurry: and B, preparing the sample adding slurry and the base slurry according to the requirements of the step B, sealing the sample adding slurry and the base slurry by using preservative films, standing for 0h, 16h, 32h, 48h, 64h and 72h at the temperature of 24 ℃, directly measuring the torque reading value of the sample after standing according to the method for measuring the reduction rate of the lubricating coefficient in the step B without stirring, and calculating the reduction rate of the lubricating coefficient according to a formula (1).
And (3) carrying out stability detection on three lubricants sold in the market according to the process D in the fresh water slurry, wherein the lubricating property of the lubricant is almost unchanged after the lubricant is kept stand for 72 hours in the fresh water slurry, and the performance of the lubricant sold in the market is sharply reduced along with the prolonging of the standing time.
E. And B, stability detection in the saline slurry, namely taking 400ml of the cured base slurry in the step A, adding 16.0g of analytically pure sodium chloride into each% of the base slurry, stirring at a high speed (the rotating speed is 11000r/min) for 5.0min, wherein the analytically pure sodium chloride is used for polluting the base slurry, adding 2.0m L of a lubricant sample into one% of the base slurry with 4% of sodium chloride, taking the other% of the base slurry as a blank, stirring the sample-added slurry and the blank slurry at a high speed (the rotating speed is 11000r/min) for 10.0min, sealing the sample-added slurry and the base slurry with preservative films respectively after the high stirring is finished, standing for 0h, 16h, 32h, 48h, 64h and 72h respectively at 24 ℃, directly measuring the torque reading value of the sample after the standing without stirring after the standing is finished according to the method for measuring the reduction rate of the lubricating coefficient in the step B, and calculating the reduction rate of the lubricating coefficient according to a formula (1).
And (3) carrying out stability detection on three lubricants sold in the market in the saline water slurry according to the process E, and as can be seen from the graph of fig. 4, the lubricating property of the lubricant provided by the invention is hardly changed after the lubricant is kept still in 4% sodium chloride polluted slurry for 72 hours, and the commercial lubricant loses the lubricating effect after the lubricant is kept still for 48 hours at most.
F. Detection of usage period: the method comprises the steps of simulating an oilfield field drilling environment indoors, preparing experimental drilling fluid according to a field common drilling fluid formula, adding lubricant samples according to the adding amount of a lubricant in a field slurry formula, separately preparing a blank test slurry with no lubricant sample, carrying out an experiment according to a cycle period of 4.0h, stirring the blank test slurry and the sample slurry at a high speed for 10min after each cycle period, pressing a mud cake for 20min by using a friction coefficient instrument under the condition of 4.0MPa, adsorbing an adhesion 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 slurry by using a torque instrument, and calculating the adhesion coefficient reduction rate of the sample according to a formula (2).
In the formula:
a-reduction of coefficient of lubrication,%;
T0-torque reading of the base stock;
T1-torque reading of the sample application slurry.
According to the F process, the service cycle detection is carried out on three commercially available lubricants, and as can be seen from the graph 5, the lubricant provided by the invention is excellent in indoor simulation field drilling tests, the mud cake adhesion coefficient reduction rate is still more than 50% after 7 times of circulation, and the commercially available lubricant completely fails after 5 cycles at most.
In the above detection tests A to F, the lubricant sample of the present invention has the following components in the following ratio: the mass portion of the industrial oleic acid is 32 percent; 55% of crude oil and 8% of additive; the mass portion of the industrial ethanol is 5 percent.
In order to verify whether the mass fraction of additives and technical oleic acid in the lubricant has an effect on the lubricating properties, two specific examples are presented below.
Example 1
In the fixed formula, the mass parts of the additive (tetramethylammonium hydroxide containing 5 crystal water is selected in the example) are 8%, the mass parts of oleic acid are respectively 30%, 31%, 32%, 33%, 34% and 35%, the mass part of industrial ethanol is 5%, and the rest of the additive is supplemented with crude oil, and the stability in the fresh water slurry and the stability in the 4% saline water slurry of the sample are respectively detected. The specific experimental results are as follows:
as shown in FIG. 6, the lubricating performance of the sample is increased along with the increase of the mass fraction of the industrial oleic acid, but the addition amount of the oleic acid has little influence on the stability of the sample in the fresh water slurry.
As shown in FIG. 7, the lubricating performance of the sample is increased along with the increase of the industrial mass fraction of the oleic acid, but the addition amount of the oleic acid has little influence on the stability of the sample in 4% saline slurry.
Example 2
In the fixed formula, the mass portion of the industrial oleic acid is 35%, the mass portions of the additive (in the embodiment, tetramethylammonium hydroxide containing 5 crystal waters is selected) are respectively 5%, 6%, 7%, 8%, 9% and 10%, the mass portion of the industrial ethanol is 5%, and the rest of the additive is supplemented with crude oil, and the stability in the fresh water slurry and the stability in the 4% saline water slurry of the sample are respectively detected. The specific experimental results are as follows:
as shown in fig. 8, as the mass fraction of the additive increases, the lubricity and stability of the sample in the fresh water slurry increase, the stability of the sample in the fresh water slurry does not decrease when the additive addition amount reaches 7%, and the lubricity and stability of the sample in the fresh water slurry reach the highest point when the additive addition amount reaches 8% and do not change with the increase of the additive addition amount.
As shown in fig. 9, as the mass fraction of the additive increases, the lubricity and the stability of the sample in the 4% saline slurry increase, when the additive is added to 8%, the stability of the sample in the fresh water slurry does not decrease, and when the additive is added to more than 8%, the lubricity of the sample in the 4% saline slurry is slightly improved but the stability of the sample in the 4% saline slurry does not change.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The water-soluble oil-based drilling fluid lubricant is characterized in that raw materials of the lubricant are mixed liquid consisting of industrial oleic acid, crude oil, an additive and industrial ethanol; wherein the mass fraction of the industrial oleic acid is 30-35%; 50-60% of crude oil and 5-10% of additive by weight; the mass portion of the industrial ethanol is 5 percent.
2. The water-soluble oil-based drilling fluid lubricant as claimed in claim 1, wherein the industrial oleic acid is present in a mass fraction of 32%; 55% of crude oil and 8% of additive; the mass portion of the industrial ethanol is 5 percent.
3. The water-soluble oil-based drilling fluid lubricant according to claim 1 or 2, wherein the additive is tetramethylammonium hydroxide crystals containing 5 crystal waters or dodecyldimethylamine or tributylamine.
4. The water-soluble oil-based drilling fluid lubricant as claimed in claim 1 or 2, wherein the industrial oleic acid is one or a mixture of any of hexadecenoic acid, heptadecenoic acid, octadecenoic acid.
5. The water-soluble oil-based drilling fluid lubricant according to claim 1 or 2, wherein the crude oil component is a light crude oil having a water content of less than 0.5%.
6. The preparation method of the water-soluble oil-based drilling fluid lubricant is characterized by comprising the following steps of:
s1, adding 30-35% of industrial oleic acid solution into a reaction container, and adding 50-60% of crude oil into the reaction container to obtain a mixed solution A;
s2, adding 5-10% of additive into another reaction container, adding 5% of industrial ethanol into the reaction container, and stirring at normal temperature until the additive is completely dissolved to obtain a mixed solution B;
s3, slowly adding the mixed solution A obtained in the step S2 into the mixed solution B obtained in the step S1, and stirring at normal temperature for 30min to generate the lubricant.
7. The method of making a water-soluble oil-based drilling fluid lubricant according to claim 5, wherein the additive is tetramethylammonium hydroxide crystals containing 5 water of crystallization or dodecyldimethylamine or tributylamine.
8. The method of making a water-soluble oil-based drilling fluid lubricant according to claim 5, wherein the industrial oleic acid is one or a mixture of any of hexadecenoic acid, heptadecenoic acid, and octadecenoic acid.
9. The method of making a water-soluble oil-based drilling fluid lubricant according to claim 5, wherein the crude oil component is a light crude oil having a water content of less than 0.5%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322260A (en) * | 2020-10-22 | 2021-02-05 | 库尔勒郑豫石油物资有限公司 | Temperature-resistant and salt-resistant environment-friendly lubricant for drilling fluid and production and detection methods thereof |
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