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Method for preparing eco-friendly coating agent for drilling fluid

An environmentally friendly, coating agent technology, applied in the field of oil and gas field drilling, can solve the problems of high polymer molecular weight, unsatisfactory temperature resistance, unsatisfactory salt resistance, etc.

Inactive Publication Date: 2011-01-12
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, polyacrylic polymer coating agent PAC141, zwitterionic polymer coating agent FA367 and polyacrylamide potassium coating agent K-PAM have been developed and used at home and abroad. It has shown good performance in the system and improved the rheology of the drilling fluid system, but in the process of field use, it also showed some shortcomings: (1) It is only suitable for a specific drilling fluid system, such as PAC141 mainly Applied to polymer drilling fluid systems, but not suitable for brine or saturated brine drilling fluid systems; (2) The temperature resistance is not ideal, and the highest temperature resistance of several coating agents such as PAC141 can only reach 150 ° C. For deep and ultra-deep wells , the downhole temperature sometimes reaches 180°C, and the coating effect is reduced or even invalid; (3) the salt resistance is not ideal, when several coating agents such as PAC141 are in 10% NaCl and above concentration solutions, flocs will be produced, reducing the Or lose the coating effect; (4) Environmental protection indicators, such as heavy metal content, do not meet the requirements of the corresponding national standards
At the same time, since the coating agent mainly adopts a synthetic process, the polymer has a high molecular weight and low biodegradability
[0004] The present invention develops an environment-friendly coating agent aimed at the problems existing in the currently used coating agent, which can solve the problems of the coating agent’s applicability to different drilling fluids, temperature resistance and salt resistance, and environmental protection. While meeting the performance of the coating agent in the drilling project, it also meets the requirements of the relevant national environmental protection standards, thereby reducing the difficulty and cost of waste drilling fluid treatment after the drilling operation is over

Method used

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  • Method for preparing eco-friendly coating agent for drilling fluid
  • Method for preparing eco-friendly coating agent for drilling fluid
  • Method for preparing eco-friendly coating agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) prepare initiator (oxidized type and reduced type) solution: add 5g tert-butyl hydroperoxide and 5g sodium sulfite respectively in 95mL water, stir, after the initiator dissolves completely, promptly obtain concentration and be 5% (wt) Tert-butyl hydroperoxide solution and 5% (wt) sodium sulfite solution.

[0046] (2) Add 10mL of water into the beaker, add 8.0g of vinyl acetate into the water, stir and fully dissolve;

[0047] (3) Add 1.0 g of cationic modified starch, continue to stir, and allow it to fully dissolve;

[0048] (4) Add 4.0g styrene sulfonate, continue to fully stir;

[0049] (5) Add 2.0g of pH regulator sodium hydroxide, fully stir;

[0050](6) Adding initiator: first add 3.0mL tert-butyl hydroperoxide solution, after fully stirring, then add 3.0mL sodium sulfite solution, and fully stir;

[0051] (7) Stirring is continued, exothermic polymerization starts after 5 minutes, and the reaction is carried out at 40-50° C. for 2-4 hours to obtain the fi...

Embodiment 2

[0053] (1) Prepare initiator (oxidized and reduced) solution: add 6.5g ammonium persulfate and 6.5g sodium sulfite in 93.5mL water respectively, stir, after the initiator dissolves completely, promptly obtain concentration and be 6.5% (wt) Ammonium persulfate solution and sodium sulfite solution with a concentration of 6.5% (wt).

[0054] (2) Add 25mL of water into the beaker, add 11.0g of methacrylamide into the water, stir and fully dissolve;

[0055] (3) Add 3.0g oxidized starch, continue to stir, allow it to fully dissolve;

[0056] (4) Add 7.0g sodium acrylate and continue to stir fully;

[0057] (5) Add 5.0g of pH regulator ammonia water, fully stir;

[0058] (6) Adding initiator: first add 2.0mL ammonium persulfate solution, after fully stirring, then add 2.0mL sodium sulfite solution, and fully stir;

[0059] (7) Stirring is continued, and exothermic polymerization starts after 5 minutes. Under the condition of 40-50°C, react for 2-4 hours to obtain the final produc...

Embodiment 3

[0061] (1) preparation initiator (oxidized type and reduced type) solution: add 8.0g potassium persulfate and 8.0g sodium bisulfite respectively in 92.0mL water, stir, after the initiator dissolves completely, promptly obtain concentration and be 8.0% ( wt) ammonium persulfate solution and 8.0% (wt) sodium sulfite solution.

[0062] (2) Add 40mL of water into the beaker, add 13.5g of acrylamide into the water, stir and fully dissolve;

[0063] (3) Add 5.0g cornstarch, continue to stir, allow it to fully dissolve;

[0064] (4) Add 10.0g sodium methacrylate and continue to stir fully;

[0065] (5) Add 7.5g of pH regulator calcium hydroxide, fully stir;

[0066] (6) Adding initiator: first add 0.5mL potassium persulfate solution, after fully stirring, then add 0.5mL sodium bisulfite solution, and fully stir;

[0067] (7) Stirring is continued, exothermic polymerization starts after 5 minutes, and the reaction is carried out at 40-50° C. for 2-4 hours to obtain the final produc...

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Abstract

The invention relates to a method for preparing an eco-friendly coating agent for drilling fluid. The method comprises the following steps of: adding 5 to 8g of oxidized type initiator A and 5 to 8g of reduced type initiator B into 92 to 95mL of water respectively to prepare 5 to 8 percent oxidized type initiator solution A and 5 to 8 percent reduced type initiator solution B; adding 10 to 40mL of water into a beaker, adding 8.0 to 13.5g of nonionic monomers into the water and stirring the mixed solution until the nonionic monomers are fully dissolved; adding 1.0 to 5.0g of biological polymer monomers into the mixed solution, and continuously stirring the mixed solution until the biological polymer monomers are fully dissolved; adding 4.0 to 10.0g of anionic monomers, and continuing to fully stir the mixed solution; adding 2.0 to 7.5g of pH value regulator, and fully stirring; adding 0.5 to 3.0mL of oxidized type initiator and reduced type initiator respectively, and fully stirring; and finally continuously stirring, starting heating polymerization after 5 minutes, and reacting at the temperature of between 40 and 50 DEG C for 2 to 4 hours to obtain the finished product. The coating agent of the invention has the advantages of high applicability, high anti-temperature and anti-salt property and high environmentally-protected property.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly coating agent for drilling fluid, which is applied to the technical field of oil and gas field drilling in the petroleum industry. Background technique [0002] The coating agent is an important additive used in the drilling fluid system, which can effectively coat the cuttings, prevent the hydration of the cuttings and shale, prevent the collapse of the borehole wall, help the stability of the borehole wall, and increase the drilling speed. It has the functions of reducing water loss, improving flow pattern and increasing lubricity. [0003] At present, polyacrylic polymer coating agent PAC141, zwitterionic polymer coating agent FA367 and polyacrylamide potassium coating agent K-PAM have been developed and used at home and abroad. It has shown good performance in the system and improved the rheology of the drilling fluid system, but in the process of field use, it also showed so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F4/40C09K8/035
Inventor 蒋官澄谢水祥陈勉李志勇史建刚张金龙胥洪彪曾留芳毛慧
Owner CHINA UNIV OF PETROLEUM (BEIJING)