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Random copolymer and its preparation method, application and drilling fluid

A technology of random copolymers and structural units, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient calcium resistance and high temperature resistance.

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a random copolymer and its preparation method, application and drilling fluid in order to overcome the problem of insufficient calcium content and high temperature resistance of the existing drilling fluid fluid loss reducer.

Method used

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  • Random copolymer and its preparation method, application and drilling fluid
  • Random copolymer and its preparation method, application and drilling fluid
  • Random copolymer and its preparation method, application and drilling fluid

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preparation example Construction

[0059] The second aspect of the present invention provides a kind of preparation method of random copolymer, comprising:

[0060] In the presence of nitrogen protection and initiator, the monomer (a) shown in formula (6), the monomer (b) shown in formula (7), the monomer (c) shown in formula (8), and The monomer (d) shown in formula (9) or formula (10) carries out radical copolymerization reaction;

[0061] Among them, R 1 and R 2 Each independently is H or C 1 -C 6 the alkyl group, R 3 and R 4 Each independently is H or C 1 -C 3 the alkyl group;

[0062] Among them, R 5 -O-R- or -NH-R-, where R is -C m h 2m -, and m=4, 5 or 6;

[0063] Among them, R 6 selected from

[0064] Among them, R 7 and R 8 Each independently is H or C 1 -C 6 the alkyl group, R 9 for-C n h 2n -, and the integer of n=2-6, R 10 for

[0065] X is halogen.

[0066] According to the present invention, preferably, the dosage of each monomer: the monomer (a) is 20-50 pa...

Embodiment 1

[0120] (1) 9.7g sodium hydroxide is dissolved in 100g water, obtains 109.7g lye;

[0121] (2) Add respectively 35g of acrylamide, 50g of 2-acrylamido-2-methylpropanesulfonic acid, 6g of N-glucose hydrochloride maleamic acid, 2g of dimethyl diene Propyl ammonium chloride, dissolved evenly. Pass nitrogen gas for 0.5h to remove oxygen to obtain monomer mixed solution, pH value is 8;

[0122] (3) Add 0.74 g of initiator V-044 (azobisisobutylimidazoline hydrochloride) to the monomer mixed solution at a temperature of 45 ° C and pH = 8 for free radical polymerization for 1 hour to obtain a gel product;

[0123] (4) After shearing and granulating the gel-like product, dry it at 65° C. for 36 hours to obtain a solid product, which is pulverized.

[0124] The obtained solid product is determined to be a random copolymer containing the following structural composition by analysis, Among them, M 1 and M 2 For Na. The apparent viscosity of the aqueous solution containing 1% by wei...

Embodiment 2

[0127] (1) Add 8.7g sodium hydroxide to 100g water, stir and dissolve to get 108.7g lye;

[0128] (2) Add respectively 42g of acrylamide, 45g of 2-acrylamido-2-methylpropanesulfonic acid, 7g of N-isopropionyl maleamic acid, 5g of dimethyl diene Propyl ammonium chloride, dissolved evenly, passed nitrogen gas for 0.5h to remove oxygen to obtain monomer mixed solution, pH value was 9;

[0129] (3) Add 0.74 g of APS (ammonium persulfate) and 0.66 g of sodium bisulfite to the monomer mixed solution at a temperature of 50 ° C and pH = 7, and carry out free radical polymerization for 1.5 hours to obtain a gel product;

[0130] (4) After shearing and granulating the gel-like product, dry it at 70° C. for 24 hours to obtain a solid product, which is pulverized.

[0131] The obtained solid product is determined to be a random copolymer containing the following structural composition by analysis,

[0132]

[0133] Among them, M 1 , M 2 and M 3 For Na. The apparent viscosity of ...

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Abstract

The invention relates to the field of reducing fluid loss in drilling fluids under high-calcium and high-temperature conditions, and discloses random copolymers and their preparation methods and applications, as well as drilling fluids and methods for reducing fluid loss in drilling fluids. The random copolymer contains structural unit (A) represented by formula (1), structural unit (B) represented by formula (2), structural unit (C) represented by formula (3), and formula (4) Or the structural unit (D) represented by formula (5), X is halogen. The random copolymer is used as a fluid loss reducer in drilling fluids to reduce the fluid loss of drilling fluids containing high calcium ions.

Description

technical field [0001] The invention relates to the field of reducing fluid loss of drilling fluids with high calcium and high temperature, in particular to a random copolymer and a preparation method thereof, and the random copolymer can be used as an anti-calcium and anti-high temperature drilling fluid in water-based drilling fluids. Application of filter loss agent. Background technique [0002] With the deepening of exploration and development, more and more high-temperature, high-calcium salt and high-pressure high-calcium brine formations are drilled, and the filtration loss and rheological properties of drilling fluid are difficult to maintain during construction, which may easily cause wellbore instability and barite settlement , stuck drill and other complex situations. In the environment of high temperature and high calcium salt, the treatment agent to maintain the performance of drilling fluid is prone to chemical and physical changes such as degradation, cross-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F220/56C08F222/38C08F226/02C08F220/38C08F220/34C09K8/035
CPCC08F220/58C08F220/38C08F220/56C09K8/035C09K2208/12
Inventor 赵金洲王琳杨小华
Owner CHINA PETROLEUM & CHEM CORP
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