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Coating inhibitor for drilling fluid and preparation method thereof

A technology for coating inhibitor and drilling fluid, applied in the field of drilling, can solve the problems of difficulty in dissolution, poor anti-slump performance and poor coating inhibition performance, and achieve the effects of stable and safe reaction, easy control of reaction process and low equipment cost.

Active Publication Date: 2016-04-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a coating inhibitor for drilling fluid and a preparation method thereof to solve the problem of poor anti-slump performance and poor coating inhibition performance caused by the difficulty in dissolving existing polymer coating inhibitors

Method used

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  • Coating inhibitor for drilling fluid and preparation method thereof
  • Coating inhibitor for drilling fluid and preparation method thereof
  • Coating inhibitor for drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0027] Please refer to the attached figure 1 , figure 1 The flow chart of the method for preparing the coating inhibitor for drilling fluid provided by the embodiment of the present invention is shown. figure 1 The process shown includes the following steps:

[0028] S101. Pour 40-80 parts by mass of water and 40-60 parts by mass of water-soluble polymer monomer into the enamel reaction kettle, and mix evenly.

[0029] The water-soluble polymer monomer in step S101 can be one of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, sodium propylene sulfonate, sodium styrene sulfonate, itaconic acid and acrylate or several. Of course, the water-soluble polymer monomer in the embodiment of the present invention can also be of other types, and this embodiment does not limit the specific type of the water-soluble polymer monomer. The reaction vessel in the embodiment of the present invention is not limited to the enamel reaction vessel, and other reaction vessel...

Embodiment 1

[0043]Please refer to the attached figure 2 , figure 2 It is a flow chart of the method for preparing the coating inhibitor for drilling fluid provided in Example 1 of the present invention. figure 2 The process shown includes:

[0044] S201. Add 10 parts by mass of sodium propylene sulfonate, 10 parts by mass of acrylic acid, 30 parts by mass of acrylamide and 70 parts by mass of deionized water into a 3000L enamel reaction kettle, stir evenly, and adjust the pH to 7 with ammonia water.

[0045] S202. Continue to add 100 parts by mass of No. 5 white oil and 10 parts by mass of Span 80 to the enamel reaction kettle, emulsify with a high-speed emulsifier for 10 minutes, blow nitrogen and deoxygenate for 30 minutes, and heat the mixture to 50°C.

[0046] S203. Add 0.01 parts by mass of potassium persulfate and 0.01 parts by mass of sodium bisulfite, and react at a constant temperature of 50°C for 10 hours. After the reaction is completed, a coated inhibitor for drilling flu...

Embodiment 2

[0048] Please refer to the attached image 3 , image 3 It is a flow chart of the method for preparing the coating inhibitor for drilling fluid provided in Example 2 of the present invention. image 3 The process shown includes:

[0049] S301. Add 10 parts by mass of sodium propylene sulfonate, 10 parts by mass of acrylic acid, 30 parts by mass of acrylamide and 70 parts by mass of deionized water into a 3000L enamel reaction kettle, stir evenly, and adjust the pH to 7 with ammonia water.

[0050] S302. Continue to add 100 parts by mass of No. 0 diesel oil and 10 parts by mass of Span 60 to the enamel reaction kettle, heat the mixture to 50° C., emulsify for 10 minutes with a high-speed emulsifier, and blow nitrogen to remove oxygen for 30 minutes.

[0051] S303. Add 0.05 parts by mass of azobisisobutyronitrile, stir, and react at a constant temperature of 50° C. for 10 hours. After the reaction is completed, a coated inhibitor for drilling fluid with uniform particle size i...

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Abstract

The invention belongs to the technical field of drilling and discloses an enveloping inhibitor for a drilling fluid and a preparation method of the enveloping inhibitor. The preparation method comprises the following steps: 1) pouring 40-80 parts by mass of water and 40-60 parts by mass of water soluble polymer monomer into a reaction container, mixing evenly, and regulating the PH of the mixture of the water and the water soluble polymer monomer to the range of 6 to 10 by use of an alkaline solution; 2) continuing to pour 20-100 parts by mass of solvent oil and 1-20 parts by mass of emulsifier into the reaction container, and stirring evenly to obtain a mixed solution; 3) adding 0.01-10 parts by mass of polymerization reaction initiator to the mixed solution, carrying out a polymerization reaction at a temperature within the range of 0-100 DEG C for 1-20 hours, and forming the enveloping inhibitor for the drilling fluid after the polymerization reaction is completed. The enveloping inhibitor for the drilling fluid, which is prepared by the method, has excellent stability and good solubility; the problems of poor collapse resistance and enveloping inhibition performance of the enveloping inhibitor in the background art due to that the inhibitor is difficult to dissolve are solved.

Description

technical field [0001] The invention relates to the technical field of drilling, and more specifically relates to a coating inhibitor for drilling fluid, and also relates to a preparation method of the coating inhibitor for drilling fluid. Background technique [0002] In oil or natural gas exploration and development, solid deposit exploration and foundation engineering construction, drill bits often encounter mud shale formations. Mud shale is very easy to hydrate and expand, and the dispersion of particles caused by hydration and expansion of shale often causes drilling problems such as wellbore instability and pipe sticking. Among them, wellbore instability is a major engineering technical problem in drilling. Wellbore stability is the prerequisite for safe, fast and high-quality drilling, and it is one of the key factors to control drilling costs and affect the comprehensive benefits of drilling. Maintaining wellbore stability is the primary factor in drilling fluid d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F228/02C09K8/035
Inventor 张振华华桂友郑斌曹晓晖关忠良
Owner BC P INC CHINA NAT PETROLEUM CORP