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Partially hydrolyzed acrylamide polymer suitable for serving as supermolecule coating agent with high temperature resistance, water-based drilling fluid, and application of water-based drilling fluid

A technology for hydrolyzing acrylamide and water-based drilling fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance (not exceeding 150°C, narrow applicable surface, difficult to meet on-site construction, etc.) , to achieve the effect of excellent inhibition of drill cuttings dispersion, improvement of temperature resistance, and excellent high temperature resistance coating performance

Active Publication Date: 2018-09-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used drilling fluid coating agents at home and abroad include zwitterionic coating agent FA367, acrylic polymer PAC141, and polyacrylamide potassium salt KPAM, etc., which have shown good performance in their respective applicable systems and improved drilling performance. However, there are still some problems, such as narrow application area, poor temperature resistance (not exceeding 150°C), etc.
With the development of drilling technology, the downhole high-temperature and complex environment is getting worse and worse, and the commonly used coating agents in the existing technology have been difficult to meet the needs of on-site construction

Method used

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  • Partially hydrolyzed acrylamide polymer suitable for serving as supermolecule coating agent with high temperature resistance, water-based drilling fluid, and application of water-based drilling fluid
  • Partially hydrolyzed acrylamide polymer suitable for serving as supermolecule coating agent with high temperature resistance, water-based drilling fluid, and application of water-based drilling fluid
  • Partially hydrolyzed acrylamide polymer suitable for serving as supermolecule coating agent with high temperature resistance, water-based drilling fluid, and application of water-based drilling fluid

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Experimental program
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preparation example Construction

[0034] The second aspect of the present invention provides a method for preparing a partially hydrolyzed acrylamide polymer, the method comprising:

[0035] (1) In an aqueous solvent, in the presence of a free radical initiator, the compound shown in formula (1'), the cationic monomer and the compound shown in formula (5') are subjected to free radical polymerization; The cation-containing monomer is a compound represented by formula (3') and / or a compound represented by formula (4');

[0036] (2) In an aqueous solution of alkali metal hydroxide, the product of the radical polymerization reaction is hydrolyzed to obtain a partially hydrolyzed acrylamide polymer;

[0037] Wherein, the method makes the obtained partially hydrolyzed acrylamide polymer have a number average molecular weight of 5 million to 10 million;

[0038]

[0039] Among them, R 1 , R 1 ', R 2 , R 2 ', R 3 , R 3 ', R 5 , R 8 and R 8 ' each independently selected from H and C1-C6 alkyl; R 4 , R 4...

Embodiment 1

[0126] This example is used to illustrate the partially hydrolyzed acrylamide polymer of the present invention and its preparation method.

[0127] (1) Dissolve 222mmol of acrylamide, 56mmol of allyltrimethylammonium chloride and 22mmol of a compound represented by formula (5'-1) (purchased from Mobe Chemical, the same below) in 200mL of deionized water, Stirring at 300r / min, blow nitrogen for 30min to remove oxygen, add 0.36mmol ammonium persulfate, continue nitrogen blowing for 10min, then add 0.24mmol sodium bisulfite, polymerize at 30°C for 7h;

[0128] (2) Add 2 mol / L sodium hydroxide aqueous solution (the amount of sodium hydroxide is 89mmol) to the polymerization reaction system, stir evenly, then raise the temperature to 80°C and stir and react at 300r / min for 8h until no gas is released in the system, stop the reaction , cooled to room temperature, dried and crushed to obtain partially hydrolyzed acrylamide polymer P1.

[0129] Through infrared, hydrogen nuclear magn...

Embodiment 2

[0131] This example is used to illustrate the partially hydrolyzed acrylamide polymer of the present invention and its preparation method.

[0132] (1) Dissolve 387mmol of N,N-dimethylacrylamide, 135mmol of allyltrimethylammonium chloride and 78mmol of the compound shown in formula (5'-1) in 200mL of deionized water, at 300r / Under stirring for 1 min, blow nitrogen for 30 min to remove oxygen, add 0.9 mmol of azobisisobutylamidine dihydrochloride, and polymerize at 50°C for 6 h;

[0133] (2) Add 2 mol / L sodium hydroxide aqueous solution (the amount of sodium hydroxide is 194 mmol) to the polymerization reaction system, stir evenly, then raise the temperature to 70°C and stir and react at 300r / min for 9h until no gas is released in the system, stop the reaction , cooled to room temperature, dried and pulverized to obtain partially hydrolyzed acrylamide polymer P2.

[0134] Through infrared, hydrogen nuclear magnetic resonance spectrum and carbon spectrum analysis detection, in...

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Abstract

The invention relates to the field of well drilling of the petroleum industry, in particular to a partially hydrolyzed acrylamide polymer suitable for a coating agent with high temperature resistance,water-based drilling fluid, and application thereof. The partially hydrolyzed acrylamide polymer comprises a structure unit as shown in a formula (1) below, a structure unit as shown in a formula (2), a structure unit containing a positive ion, and a structure unit as shown in a formula (5), wherein the structure unit containing the positive ion is a structure unit as shown in a formula (3) and / or a structure unit as shown in a formula (4); the number-average molecular weight of the partially hydrolyzed acrylamide polymer is 5 million to 10 million. The polymer provided by the invention has excellent coating performance with high temperature resistance, and an excellent capability of inhibiting drilling cuttings dispersion at high temperature when serving as the coating agent in the water-based drilling fluid. (All the formulae are shown in the description).

Description

technical field [0001] The invention relates to the drilling field of the petroleum industry, in particular to a partially hydrolyzed acrylamide polymer and water-based drilling fluid suitable for high-temperature resistant supramolecular coating agents and applications thereof. Background technique [0002] Shale borehole stability has always been a worldwide problem in drilling engineering, and has not been completely resolved. According to statistics, about 75% of the formations encountered during drilling are shale, and about 80% of the wellbore is not stable. Stability problems occur in shale formations, and wellbore stability problems account for half of the total losses during drilling. At present, the main method to solve the problem of wellbore stability in shale is to use oil-based drilling fluid, but the serious pollution and high cost of oil-based drilling fluid limit its use. High-performance water-based drilling fluid with strong inhibition It is the direction...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/54C08F226/02C08F226/06C09K8/035C09K8/24
CPCC08F220/54C08F220/56C09K8/035C09K8/24C08F226/02C08F226/06
Inventor 蒋官澄王勇史亚伟高德利贺垠博杨丽丽孙金声杨潇王腾达朱鸿昊马光长伍贤柱蒲晓林王玺
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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