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Preparation method of latex plugging agent for drilling fluids, and drilling fluid

A technology of drilling fluid and plugging agent, which is applied in the preparation of latex plugging agent for drilling fluid and in the field of drilling fluid, which can solve the problems of easy foaming, poor stability, and easy demulsification, etc., achieve long stable period and reduce foaming Sex, the effect of reducing environmental pollution

Active Publication Date: 2019-04-23
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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  • Preparation method of latex plugging agent for drilling fluids, and drilling fluid
  • Preparation method of latex plugging agent for drilling fluids, and drilling fluid
  • Preparation method of latex plugging agent for drilling fluids, and drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In parts by weight, 55.0 parts of polystyrene foam was pulverized, dissolved in 83.0 parts of ethyl acrylate under stirring, and mixed 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, the temperature rises to 80°C, and keep for 1 to 2 hours , the reaction system was neutralized to 7-8 with NaOH to obtain oligomers.

[0036] Cool down the oligomer system, add 2.0 parts of acrylamide aqueous solution under stirring, slowly add 138.0 parts of foam liquid dropwise, continue to stir and heat, when the temperature rises to 75°C, add 0.30 parts of azobisisobutyramidine salt The acid solution was incubated for 3 hours to terminate the reaction to obtain a 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, the temperature rises to 80°C, and keep the temperature for 1~ In 2h, the reaction system was neutralized to 7-8 with KOH to obtain oligomers.

[0040] Cool down the oligomer system, under stirring, add 8.0 parts of N,N-dimethylacrylamide aqueous solution, slowly add 85.0 parts of foam liquid dropwise, 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, and the temperature was maintained for 4 hours to terminate the reaction 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, 6.0 parts of methyl acrylate, stir and heat, when the temperature rises to 70°C, add 0.036 parts of azobisisobutyramidine hydrochloride, and the temperature rises to 80°C , keep the temperature for 1~2h, and neutralize the reaction system to 7~8 with NaOH to obtain oligomer.

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

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Abstract

The invention provides a preparation method of a plugging agent for drilling fluids. The preparation method comprises: dissolving polystyrene foam in an ester-based monomer to obtain a foam liquid; carrying out a reaction on water, an organic acid-based monomer, an ester-based monomer and an initiator to obtain an oligomer; and carrying out a reaction on the oligomer, an amide-based monomer, the foam liquid and an initiator to obtain the latex plugging agent for drilling fluids. According to the present invention, the external surfactant is not introduced during the preparation of the latex plugging agent used for drilling fluids and prepared by soap-free emulsion polymerization; and the oligomer in the preparation process is hydrophilic and lipophilic, can be used as the emulsion polymerization stabilizer so as to achieve the long stability period of the emulsion and minimize the foaming property of the plugging agent in the drilling fluid, and further has good compatibility and goodtemperature resistance so as to physically and chemically block the micro-crack stratum of the mud shale, prevent the drilling fluid from entering the stratum and effectively improve the stability ofthe wellbore. The invention further provides a drilling fluid.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling oilfield chemicals, in particular to a preparation method of a latex plugging agent for drilling fluid and a drilling fluid. Background technique [0002] In recent years, with the progress of exploration and development of oil and gas reservoirs, the strata encountered by drilling have become increasingly complex, and borehole instability has become a major obstacle to the realization of exploration goals. During the drilling of hard and brittle mud shale formations, the drilling fluid filtrate will follow the bedding, formation and chemical potential differences formed in the mud shale diagenesis process under the action of the wellbore liquid column pressure and formation pressure pressure difference, as well as the capillary force and chemical potential difference inside the rock. Microfractures intrude into the interior of the rock. Even if there is no positive pressure difference...

Claims

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Application Information

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Patent Type & Authority Applications(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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