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High-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as preparation method and application thereof

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of inapplicability of fluid loss control agent, improve the performance of high temperature resistance and salt resistance, and improve the preparation process Simple, effective in reducing fluid loss

Inactive Publication Date: 2019-11-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing fluid loss control agent is not suitable for high-temperature and high-salt deep complex formation environment, and provide a high-temperature and salt-resistant copolymer type water-based drilling fluid fluid loss control agent

Method used

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  • High-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as preparation method and application thereof
  • High-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as preparation method and application thereof
  • High-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of a high-temperature-resistant and salt-resistant copolymer type water-based drilling fluid fluid loss reducer, comprising the following steps:

[0017] (1) 5 parts of sodium p-styrene sulfonate monomer, 4.5 parts of N, N-dimethylacrylamide monomer and 0.5 part of itaconic acid monomer were dissolved in 35 parts of distilled water in sequence according to the mass, and the pH value was adjusted to 5. Stir evenly and heat up to 60°C to obtain a mixed solution;

[0018] (2) Take by weighing the initiator ammonium persulfate equivalent to 0.5% of the total monomer mass of step (1) and be dissolved in 5 parts of distilled water, stir to obtain the initiator solution;

[0019] (3) Add the initiator solution dropwise to the mixed solution obtained in step (1) at a uniform speed for 20 minutes. After the dropwise addition, heat up to 65° C. and continue the reaction for 5 hours to obtain a viscous liquid, freeze-dry, Pulverized to obtain high temperature...

Embodiment 2

[0021] A preparation method of a high-temperature-resistant and salt-resistant copolymer type water-based drilling fluid fluid loss reducer, comprising the following steps:

[0022] (1) Dissolve 7 parts of sodium p-styrene sulfonate monomer, 2.5 parts of acrylamide monomer and 1 part of maleic acid monomer in 33 parts of distilled water in sequence according to the mass, adjust the pH value to 8, stir evenly and heat up to 55°C, a mixed solution was obtained;

[0023] (2) Take by weighing 2.0% initiator potassium persulfate equivalent to step (1) monomer gross mass and be dissolved in 7 parts of distilled water, stir to obtain initiator solution;

[0024] (3) Add the initiator solution dropwise to the mixed solution obtained in step (1) at a constant speed for 40 minutes. After the dropwise addition, heat up to 80° C. and continue the reaction for 2 hours to obtain a viscous liquid, freeze-dry, Pulverize to obtain high temperature resistant and salt resistant copolymer type w...

Embodiment 3

[0026] A preparation method of a high-temperature-resistant and salt-resistant copolymer type water-based drilling fluid fluid loss reducer, comprising the following steps:

[0027] (1) Dissolve 6 parts of sodium p-styrene sulfonate monomer, 3.5 parts of N, N-diethylacrylamide monomer and 0.5 part of fumaric acid monomer in 35 parts of distilled water in sequence according to the mass, and adjust the pH value to 6. Stir evenly and heat up to 60°C to obtain a mixed solution;

[0028] (2) Take by weighing 1.0% of the initiator azobisisobutylamidine hydrochloride equivalent to the total mass of the monomers in step (1) and dissolve it in 6 parts of distilled water, and stir to obtain the initiator solution;

[0029] (3) Add the initiator solution dropwise to the mixed solution obtained in step (1) at a constant speed for 30 minutes. After the dropwise addition, heat up to 70°C and continue the reaction for 3 hours to obtain a viscous liquid and freeze it. After being dried and p...

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Abstract

The invention discloses a high-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) dissolving a polymeric monomer in water, and adjusting the pH value to 5-8; (2) adding an initiator into the solution, and performing a reaction for 2-5hours at the temperature of 60-80 DEG C under mechanical stirring; and (3) carrying out freeze drying on a thick polymer aqueous solution after the reaction is finished, and crushing the reaction product to obtain the solid water-based drilling fluid loss reducing agent. The preparation process is simple, low in cost and wide in application range, and can ensure that water-based drilling fluid has good filtration performance under high temperature, high pressure and hypersalinity.

Description

technical field [0001] The invention relates to the technical field of water-based drilling fluid treatment agents, in particular to a high-temperature-resistant and salt-resistant copolymer-type water-based drilling fluid fluid loss reducer, a preparation method and application thereof. Background technique [0002] As the exploration and development of oil and gas resources gradually develop into deep wells and ultra-deep wells, the complex formation environment (such as high temperature, high pressure, large temperature difference, large pressure difference and high salinity) poses severe challenges to the performance of drilling fluids. At the same time, higher requirements are placed on the performance of drilling fluid treatment agents. As one of the core treatment agents of water-based drilling fluid, fluid loss reducer, the amount of fluid loss is directly related to the protection of the reservoir and the stability of the wellbore. During the circulation of drillin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/14C08F222/02C08F220/54C08F220/56C09K8/24
CPCC08F212/14C09K8/24C08F220/56C08F222/02C08F220/54
Inventor 郭锦棠李鹏鹏徐杨刘明冯亚凯任相魁
Owner TIANJIN UNIV
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