A kind of preparation method and drilling fluid of latex plugging agent for drilling fluid

A drilling fluid and plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of easy demulsification, poor stability, easy foaming, etc.

Active Publication Date: 2021-06-15
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The latex plugging agent in the prior art is easy to foam in the drilling fluid, easy to demulsify under high temperature conditions, and has poor stability. The present invention provides a temperature-resistant latex plugging agent for drilling fluid prepared from soap-free emulsion. Preparation

Method used

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  • A kind of preparation method and drilling fluid of latex plugging agent for drilling fluid
  • A kind of preparation method and drilling fluid of latex plugging agent for drilling fluid
  • A kind of preparation method and drilling fluid of latex plugging agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In parts by weight, crush 55.0 parts of polystyrene foam, dissolve it in 83.0 parts of ethyl acrylate under stirring, and mix uniformly to obtain a foam liquid.

[0035]Weigh 184.0 parts of deionized water, 9.0 parts of acrylic acid, and 2.0 parts of vinyl acetate, stir and heat, when the temperature rises to 60°C, add 0.26 parts of azobisisobutyronitrile, raise the temperature to 80°C, and keep warm for 1-2 hours , The reaction system was neutralized to 7-8 with NaOH to obtain oligomers.

[0036] Lower the temperature of the oligomer system, add 2.0 parts of acrylamide aqueous solution under stirring, slowly drop into 138.0 parts of foam liquid, continue stirring and heating, when the temperature rises to 75°C, add 0.30 parts of azobisisobutyramide salt salt solution, keep warm for 3h, terminate the reaction, and obtain the soap-free latex plugging agent.

Embodiment 2

[0038] In parts by weight, 17.0 parts of polystyrene foam was pulverized, dissolved in 68.0 parts of butyl methacrylate under stirring, and mixed uniformly to obtain a foam liquid.

[0039] Weigh 155.0 parts of deionized water, 6.0 parts of methacrylic acid, and 4.0 parts of butyl methacrylate, stir and heat, when the temperature rises to 65°C, add 0.08 parts of ammonium persulfate, raise the temperature to 80°C, and keep warm for 1~ 2h, the reaction system was neutralized to 7~8 with KOH to obtain oligomers.

[0040] Lower the temperature of the oligomer system, add 8.0 parts of N,N-dimethylacrylamide aqueous solution under stirring, slowly drop into 85.0 parts of foam liquid, continue stirring and heating, when the temperature rises to 65°C, add 0.31 parts Potassium persulfate solution, the temperature was raised to 80°C, kept for 4 hours, and the reaction was terminated to obtain a soap-free latex plugging agent.

Embodiment 3

[0042] In parts by weight, 8.0 parts of polystyrene foam was pulverized, dissolved in 125 parts of ethyl methacrylate under stirring, and mixed uniformly to obtain a foam liquid.

[0043] Weigh 286.0 parts of deionized water, 3.0 parts of fumaric acid, and 6.0 parts of methyl acrylate, stir and heat, when the temperature rises to 70°C, add 0.036 parts of azobisisobutylamidine hydrochloride, and the temperature rises to 80°C , keep warm for 1-2h, and the reaction system is neutralized to 7-8 with NaOH to obtain oligomers.

[0044] Cool down the oligomer system, add 12.0 parts of acrylamide aqueous solution under stirring, slowly add 133.0 parts of foam liquid, continue to stir and heat, when the temperature rises to 85°C, add 0.62 parts of ammonium persulfate solution, the temperature rises Heat at 80°C for 6 hours to terminate the reaction to obtain a soap-free latex plugging agent.

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Abstract

The invention provides a method for preparing a plugging agent for drilling fluid, comprising the following steps: dissolving polystyrene foam in ester monomers to obtain foam liquid; mixing water, organic acid monomers, and ester monomers React with initiator to obtain oligomer; react oligomer, amide monomer, foam liquid and initiator to obtain latex plugging agent for drilling fluid. The latex plugging agent for drilling fluid prepared by the method of soap-free emulsion polymerization in the present invention does not introduce additional surfactant in the preparation process, and the oligomer in the preparation process has hydrophilic and lipophilic properties, and can be used as a stabilizer for emulsion polymerization. agent, which makes the emulsion stable for a long period, can minimize the foaming of the plugging agent in the drilling fluid, and has good compatibility and temperature resistance, and can physically and chemically plug the shale micro-fracture formation, Prevent the liquid phase of drilling fluid from entering the formation, and effectively improve the stability of the borehole wall. The invention also provides a drilling fluid.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and oilfield chemicals, in particular to a preparation method of a latex plugging agent for drilling fluid and the drilling fluid. Background technique [0002] In recent years, with the development of exploration and development of oil and gas reservoirs, the formation encountered has become more and more complex, and the instability of wellbore has become a major obstacle to the realization of exploration goals. During the drilling process of hard and brittle shale formations, the drilling fluid filtrate will follow the bedding, Microcracks penetrate into the interior of the rock. Even in the case of underbalanced drilling where there is no positive pressure difference, due to the hydrophilicity of shale, the drilling fluid filtrate will enter the formation due to the capillary force and wetting of the micro-fractures in the formation, causing internal stress imbalance and The incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/24C09K8/44C08F257/02C08F220/06C08F218/08C08F220/56C08F220/54C08F220/18C08F220/14C08F222/02
CPCC09K8/035C09K8/24C09K8/426C09K8/44C08F257/02C08F220/1808C08F220/1804C08F220/1802
Inventor 张丽君李晓岚史沛谦苏雪霞李保慧梁庆磊
Owner 中石化石油工程技术服务有限公司
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