CN111349425B - Low-fluorescence lubricant for drilling fluid and preparation method thereof - Google Patents
Low-fluorescence lubricant for drilling fluid and preparation method thereof Download PDFInfo
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- CN111349425B CN111349425B CN202010327343.4A CN202010327343A CN111349425B CN 111349425 B CN111349425 B CN 111349425B CN 202010327343 A CN202010327343 A CN 202010327343A CN 111349425 B CN111349425 B CN 111349425B
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- 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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- C09K2208/34—Lubricant additives
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Abstract
The invention discloses a low-fluorescence lubricant for drilling fluid and a preparation method thereof, and solves the problems that the existing low-fluorescence lubricant is poor in salt pollution resistance and does not have calcium ion pollution resistance, and the lubricating performance is greatly reduced in a high-temperature environment. The raw materials of the lubricant are mixed liquid consisting of industrial oleic acid, industrial coconut oil, industrial white oil, softened water and additives; the mass portion of the industrial oleic acid is 25-30%; 15-20% of industrial coconut oil, 35-45% of industrial white oil, 10% of softened water and 5-10% of additive.
Description
Technical Field
The invention relates to the technical field of chemical production, and particularly relates to a low-fluorescence lubricant for drilling fluid and a preparation method thereof.
Background
Most of the commercially available low-fluorescence lubricants at present are base oil (low-fluorescence white oil or other oil) and are compounded by adding other non-fluorescence or low-fluorescence other materials with high lubricating capability, and in the aspect of fluorescence grade, the fluorescence grade of the commonly used low-fluorescence lubricant at present is 3-4 grade, and is 4 grade, but the existing low-fluorescence lubricant has the following defects:
1. the salt pollution resistance is poor, and almost all the existing low-fluorescence lubricants can only play a role in sodium chloride polluted pulp with the concentration of less than 20 percent during detection.
2. The influence of calcium ion pollution cannot be avoided.
3. The maximum use temperature of the existing low-fluorescence lubricant is only 200 ℃, and the lubricating performance can be greatly influenced after the maximum use temperature is exceeded.
Disclosure of Invention
Aiming at the problems of the background art, the invention provides a low-fluorescence lubricant for drilling fluid, which solves the problems that the existing low-fluorescence lubricant has poor salt pollution resistance and no calcium ion pollution resistance, and the lubricating performance is greatly reduced in a high-temperature environment.
Meanwhile, the invention also provides a preparation method of the low-fluorescence lubricant for the drilling fluid, which is simple in production process.
The technical scheme of the invention is as follows:
the invention provides a low-fluorescence lubricant for drilling fluid, which is prepared from a mixed solution of industrial oleic acid, industrial coconut oil, industrial white oil, softened water and an additive as raw materials; the mass portion of the industrial oleic acid is 25-30%; 15-20% of industrial coconut oil, 35-45% of industrial white oil, 10% of softened water and 5-10% of additive.
Further, the mass fraction of the industrial oleic acid is 27%; the mass portion of the industrial coconut oil is 17%, the mass portion of the industrial white oil is 40%, the mass portion of the softened water is 10%, and the mass portion of the additive is 8%.
Further, the additive is a mixture of urea and inorganic base; when the inorganic base is a monobasic inorganic base, the molar ratio of the two is 3:1, preferably the monobasic inorganic base is sodium hydroxide or potassium hydroxide, when a dibasic base is used, the molar ratio of urea to the dibasic inorganic base is 3:0.5, the inorganic base is added to the additive in order to provide OH-, since the dibasic base or polybasic base will provide a corresponding multiple of OH-at the same molar amount, so the molar ratio of urea to dibasic base when a dibasic base is used is 3:0.5, when polybasic bases are used, and so on.
Further, the industrial white oil is No. 15 white oil, and the softened water is water with the hardness of 0.
Further, the industrial oleic acid is one or a mixture of any one of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
The invention also provides a preparation method of the low-fluorescence lubricant for the drilling fluid, which comprises the following steps:
s1, adding 25-30% by mass of industrial oleic acid into a reaction container, adding 15-20% by mass of industrial coconut oil under a stirring state, stirring for 5min, and then adding 35-45% by mass of industrial white oil to obtain a mixed solution A;
s2, adding 10% by mass of softened water into another reaction container, and then adding 5-10% by mass of additives to obtain a mixed solution B;
and S3, slowly adding the mixed solution B into the mixed solution A, and stirring for 20min at normal temperature to generate the lubricant.
Further, the additive is a mixture of urea and inorganic base according to a mass ratio of 3: 1; the inorganic alkali is caustic soda or potassium hydroxide with the same molar weight and anhydrous sodium carbonate with the molar weight of 0.5 time.
Further, the industrial white oil is No. 15 white oil, and the softened water is water with the hardness of 0.
Further, the industrial oleic acid is one or a mixture of any one of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
The action principle is as follows:
the industrial coconut oil is rich in a large amount of carboxylic acid substances, and the carbon chain length of the carboxylic acid contained in the industrial coconut oil is widely distributed, so that the anti-pollution capacity of the lubricant prepared by the reaction of the industrial coconut oil is obviously due to the fact that the lubricant is prepared by using oleic acid. The carboxylic acid components in the industrial oleic acid and the industrial coconut oil and the inorganic base in the additive rapidly generate saponification reaction in water at normal temperature to generate carboxylate, the sodium carboxylate and the urea in the additive generate chemical reaction 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:
saponification reaction to produce sodium carboxylate
RCOOH+OH-→RCOONa
Reaction at normal temperature
RCOO-+CO (N H2)2→RCONHCONHOCR (1)
Reacting at high temperature to form amide structure
RCONHCONHOCR +H2O→RCONH2 (2)
The lubricating performance of the industrial oleic acid and the additive can be greatly improved after the reaction, the current situation that the industrial oleic acid cannot be dissolved in water is improved, on the other hand, the product performance of carboxylic acid substances in the industrial coconut oil is different due to different carbon chain lengths, wherein one part of the carboxylic acid substances has higher lubricating performance, and the other part of the carboxylic acid substances can greatly improve the temperature resistance and calcium ion pollution resistance of the finished lubricant.
The invention has the beneficial effects that:
1. the fluorescence grade is low, and the fluorescence grade of the low-fluorescence lubricant is 3-4 grades lower than that of a commercially available low-fluorescence lubricant, so that the success rate and the effect of geological logging are greatly improved.
2. The low-fluorescence lubricant provided by the invention has high lubricating performance in sodium chloride polluted slurry, and the high content of sodium chloride in the sodium chloride polluted slurry has no influence on the performance of the lubricant.
3. The low-fluorescence lubricant provided by the invention has the capability of resisting calcium ion pollution, has higher lubricity in calcium ion polluted slurry, and has a reduction rate of a lubricating coefficient of more than or equal to 70% in 1000mg/L calcium ion polluted slurry.
3. The low-fluorescence lubricant provided by the invention has strong high-temperature resistance, and the performance of the lubricant used in a high-temperature environment is almost unchanged.
Drawings
FIG. 1 is a graph comparing performance measurements of lubricants of the present invention with commercially available lubricants in a slurry contaminated with sodium chloride;
FIG. 2 is a graph comparing the performance measurements of lubricants of the present invention with commercially available lubricants in calcium chloride contaminated slurries;
FIG. 3 is a graph comparing performance measurements of lubricants of the present invention with commercially available lubricants at different temperatures;
FIG. 4 is a graph of the performance of a sample of the lubricant prepared in the first example as a function of the mass fraction of industrial oleic acid in a slurry contaminated with sodium chloride;
FIG. 5 is a graph of the performance of a lubricant sample prepared in accordance with example one as a function of the mass fraction of industrial oleic acid in calcium chloride contaminated slurry;
FIG. 6 is a graph of the performance of a sample of the lubricant prepared in the first example as a function of the mass fraction of technical oleic acid at various temperatures;
FIG. 7 is a graph of the performance of a sample of the lubricant prepared in example two as a function of parts by mass of industrial oleic acid in a slurry contaminated with sodium chloride;
FIG. 8 is a graph showing the performance of a sample of the lubricant prepared in example two as a function of the mass fraction of industrial oleic acid in calcium chloride contaminated slurry;
FIG. 9 is a graph of the performance of the lubricant samples prepared in example two as a function of the mass fraction of technical oleic acid at different temperatures;
FIG. 10 is a graph showing the performance of a sample of the lubricant prepared in example III as a function of the mass fraction of industrial oleic acid in a slurry contaminated with sodium chloride;
FIG. 11 is a graph showing the performance of a lubricant sample prepared in example III as a function of the mass fraction of industrial oleic acid in calcium chloride contaminated slurry;
FIG. 12 is a graph of the performance of the lubricant samples prepared in example three as a function of the mass fraction of technical oleic acid at different temperatures.
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. Preparing sodium chloride polluted slurry: taking 400mL of the base slurry cured for 24h in A, respectively adding 0g, 20g, 40g, 60g, 80g, 100g, 120g and 145g of analytically pure sodium chloride into the base slurry, and stirring at a high speed of 11000r/min for 20min to prepare 0%, 5%, 10%, 15%, 20%, 25%, 30% and saturated sodium chloride polluted slurry.
C. Preparing calcium chloride polluted slurry: taking 400mL of the base slurry cured for 24 hours in A, respectively adding 0.11g, 0.22g, 0.33g, 0.44g, 0.55g, 0.66g, 0.77g, 0.88g, 0.99g and 1.1g of analytically pure calcium chloride into the base slurry, and stirring at a high speed of 11000r/min for 20min to prepare 100mg/L, 200mg/L, 300mg/L, 400mg/L, 500mg/L, 600mg/L, 700mg/L, 800mg/L, 900mg/L and 1000mg/L calcium chloride pollution slurry.
D. 2% of the contaminated slurry in B, C (2% of each concentration in B, C) was taken, 2.0mL of lubricant sample was added to 1% of the contaminated slurry, and another 1% was used as a blank, and torque readings of the base slurry and the sample slurry at 0.7MPa (150inch lbf torque, 1.5inch arm) and 60r/min were measured at room temperature using an extreme pressure lubricator. And the lubrication coefficient reduction rate is calculated according to equation 1.
In the formula:
r-reduction of lubrication coefficient,%;
K0-torque reading of the base stock;
K1-torque reading of the sample application slurry.
And (3) detecting the performances of three lubricants sold in the market according to the process D, wherein the lubricating performance of the similar low-fluorescence lubricant sold in the market is rapidly reduced along with the increase of the content of sodium chloride in the test slurry, and the performance of the low-fluorescence lubricant is unchanged as can be seen from the graph 1.
As can be seen from FIG. 2, the performance of the commercially available low-fluorescence lubricant is greatly reduced with the increase of the calcium ion content in the test slurry, and all the commercially available low-fluorescence lubricants are failed when the calcium ion content reaches 1000mg/L, the lubricating performance of the lubricant is reduced but the reduction range is extremely small with the increase of the calcium ion content in the test slurry, and the reduction rate of the lubricating coefficient is as high as 74.8% when the calcium ion content reaches 1000 mg/L.
E. Respectively taking 2% of the base slurry in the A, adding 2.0mL of lubricant sample into 1% of the base slurry in the A, taking the other 1% as blank, respectively filling the sample slurry and the base slurry into an aging tank, respectively carrying out hot rolling for 16h under the conditions of 100 ℃, 120 ℃, 150 ℃, 180 ℃, 200 ℃, 220 ℃ and 250 ℃, taking out and cooling to room temperature, and calculating the reduction rate of the lubricating coefficient according to the formula (1).
The performance of the three lubricants sold in the market is detected according to the process E, and as can be seen from the graph in FIG. 3, the performance of the environment-friendly lubricant is almost unchanged along with the increase of the aging temperature, and the lubricating performance of the low-fluorescence lubricant sold in the market is sharply reduced after the aging temperature exceeds 120 ℃.
The proportion of each component of the lubricant sample in the detection test of D, E is as follows: the mass portion of the industrial oleic acid is 27 percent; the mass portion of the industrial coconut oil is 17%, the mass portion of the industrial white oil is 40%, the mass portion of the softened water is 10%, and the mass portion of the additive (in the test, the formula of the additive is a mixture of urea and sodium hydroxide according to the mass ratio of 3: 1) is 8%.
In order to verify whether the mass fraction of industrial oleic acid, industrial coconut oil and additives in the lubricant has an effect on the lubricating properties, three specific examples are presented below.
Example one
The mass portion of the industrial coconut oil in the fixed formula is 20%, the mass portion of the additive (the formula of the additive in the test is a mixture of urea and sodium hydroxide according to the mass ratio of 3: 1) is 10%, the mass portion of the softened water is 10%, the mass portions of the industrial oleic acid are respectively 25%, 26%, 27%, 28%, 29% and 30%, and the rest components are supplemented by the industrial white oil. And respectively detecting the temperature resistance, salt resistance and calcium ion pollution resistance of the sample. The specific experimental results are as follows:
as shown in FIG. 4, the anti-contamination capability of the lubricant used in this example against sodium chloride increases with the increase of the mass fraction of the industrial oleic acid, and the anti-contamination capability of the sample against salt reaches the maximum value when the addition amount of the industrial oleic acid exceeds 28%. As shown in fig. 5, the calcium ion contamination resistance of the lubricant used in this example was almost unchanged with increasing mass fraction of oleic acid. As shown in fig. 6, the high temperature resistance of the lubricant used in this example hardly changed with the increase in the mass fraction.
Example two
The mass portion of the industrial oleic acid in the fixed formula is 30%, the mass portion of the additive (the formula of the additive in the test is a mixture of urea and sodium hydroxide according to the mass ratio of 3: 1) is 10%, the mass portion of the softened water is 10%, the mass portions of the industrial coconut oil are respectively 15%, 16%, 17%, 18%, 19% and 20% 1, and the rest components are supplemented with the industrial white oil. And respectively detecting the temperature resistance, salt resistance and calcium ion pollution resistance of the sample. The specific experimental results are as follows:
as shown in fig. 6, the sodium chloride contamination resistance of the lubricant employed in this example was almost unchanged with increasing mass fraction of industrial coconut oil. As shown in fig. 7, the calcium ion contamination resistance of the lubricant employed in this example increased with increasing mass fraction of industrial coconut oil. As shown in fig. 8, the high temperature resistance of the lubricant employed in this example is almost unchanged with increasing mass fraction of industrial coconut oil.
EXAMPLE III
The mass parts of the industrial oleic acid, the softened water and the industrial coconut oil in the fixed formula are respectively 30%, 10% and 20%, the mass parts of the additive (the formula of the additive in the test is a mixture of urea and sodium hydroxide according to the mass ratio of 3: 1) are respectively 5%, 6%, 7%, 8%, 9% and 10%, and the rest components are supplemented by the industrial white oil. And respectively detecting the temperature resistance, salt resistance and calcium ion pollution resistance of the sample.
The specific experimental results are as follows:
as shown in fig. 9, the anti-contamination ability with sodium chloride of the lubricant used in this example hardly changed as the mass fraction of the additive increased. As shown in fig. 10, the anti-calcium contamination ability of the lubricant used in this example was almost unchanged with the increase of the mass fraction of the additive. As shown in FIG. 11, the high temperature resistance of the lubricant used in this example increased with the increase in the mass fraction of the additive.
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 (7)
1. The low-fluorescence lubricant for the drilling fluid is characterized in that raw materials of the lubricant are mixed liquid consisting of industrial oleic acid, industrial coconut oil, industrial white oil, softened water and an additive; the mass portion of the industrial oleic acid is 25-30%; 15-20% of industrial coconut oil, 35-45% of industrial white oil, 10% of softened water and 5-10% of additive;
the additive is a mixture of urea and an inorganic base.
2. The low-fluorescence lubricant for drilling fluid as claimed in claim 1, wherein the mass fraction of the industrial oleic acid is 27%; the mass portion of the industrial coconut oil is 17%, the mass portion of the industrial white oil is 40%, the mass portion of the softened water is 10%, and the mass portion of the additive is 8%.
3. The low fluorescence lubricant for drilling fluid according to claim 1 or 2, wherein the industrial white oil is No. 15 white oil, and the softened water is water with hardness of 0.
4. The low-fluorescence lubricant for drilling fluid as claimed in claim 1 or 2, wherein the industrial oleic acid is one or a mixture of any of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
5. The preparation method of the low-fluorescence lubricant for the drilling fluid is characterized by comprising the following steps of:
s1, adding 25-30% by mass of industrial oleic acid into a reaction container, adding 15-20% by mass of industrial coconut oil under a stirring state, stirring for 5min, and then adding 35-45% by mass of industrial white oil to obtain a mixed solution A;
s2, adding 10% by mass of softened water into another reaction container, and then adding 5-10% by mass of additives to obtain a mixed solution B; the additive is a mixture of urea and inorganic base according to a mass ratio of 3: 1; the inorganic alkali is caustic soda or potassium hydroxide with the same molar weight and anhydrous sodium carbonate with the molar weight of 0.5 time;
and S3, slowly adding the mixed solution B into the mixed solution A, and stirring for 20min at normal temperature to generate the lubricant.
6. The preparation method of the low-fluorescence lubricant for drilling fluid, according to claim 5, characterized in that the industrial white oil is No. 15 white oil, and the softened water is water with the hardness of 0.
7. The preparation method of the low-fluorescence lubricant for drilling fluid, according to claim 5, characterized in that the industrial oleic acid is one or a mixture of any of hexadecenoic acid, heptadecenoic acid and octadecenoic acid.
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| CN111484835B (en) * | 2020-04-23 | 2023-02-03 | 新疆塔里木油田建设工程有限责任公司 | Water-soluble oil-based drilling fluid lubricant and preparation method thereof |
| CN112175591A (en) * | 2020-10-22 | 2021-01-05 | 库尔勒郑豫石油物资有限公司 | Efficient temperature-resistant salt-resistant lubricant for drilling fluid and production and detection methods thereof |
| 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 |
| CN114181675B (en) * | 2021-12-29 | 2023-02-24 | 新疆丰茗科技有限公司 | Efficient composite lubricant for drilling fluid and preparation method thereof |
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| GB749443A (en) * | 1952-04-30 | 1956-05-23 | Exxon Research Engineering Co | Improvements in or relating to lubricant compositions containing metal-containing lubricant additives |
| CA918348A (en) * | 1970-08-03 | 1973-01-02 | W. Nahm Jang | Drilling fluids |
| CN103694968A (en) * | 2013-12-23 | 2014-04-02 | 中国石油集团渤海钻探工程有限公司 | Acylamino amine oil-based well drilling liquid wetting agent and preparation method thereof |
| CN104232032A (en) * | 2014-09-29 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Lubricating agent for shaft boring machine and preparation method of lubricating agent |
| CN107325797B (en) * | 2016-04-28 | 2021-05-14 | 中国石油化工股份有限公司 | Low oil-water ratio oil-based drilling fluid and preparation method thereof |
| CN109439294B (en) * | 2018-11-14 | 2020-09-22 | 山东得顺源石油科技有限公司 | Temperature-resistant and salt-resistant extreme pressure lubricant for high-density drilling fluid and preparation method thereof |
| CN109825265B (en) * | 2019-03-18 | 2020-12-29 | 四川正蓉实业有限公司 | Liquid non-fluorescent lubricant for well drilling |
| 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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