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Wall fixing agent for drilling fluid as well as preparation method and application of wall fixing agent

A technology of wall solidifying agent and drilling fluid, applied in the field of drilling fluid, can solve the problems of incapable of sticking to the rock, and the wall solidifying agent is difficult to absorb the rock surface, etc., so as to improve the stability of the well wall, improve the anti-slump performance, and improve the rock surface. the effect of strength

Active Publication Date: 2020-10-09
BEIJING SHIDABOCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing wall-fixing agents are difficult to adsorb on the rock surface in a water environment, and cannot play the role of sticking rocks

Method used

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  • Wall fixing agent for drilling fluid as well as preparation method and application of wall fixing agent
  • Wall fixing agent for drilling fluid as well as preparation method and application of wall fixing agent
  • Wall fixing agent for drilling fluid as well as preparation method and application of wall fixing agent

Examples

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preparation example Construction

[0035] An embodiment of the present invention also proposes a method for preparing a wall-fixing agent, comprising the following steps:

[0036] (1) Mix acrylamide, DMDAAC, and part of distilled water, heat up to 65-70°C, add adhesive and part of initiator, and react at a constant temperature of 65-70°C to obtain product 1;

[0037] (2) Mix the chain transfer agent, sodium hydroxide, and the remaining distilled water, add AMPS, stir, add acrylic acid, adjust the pH value to 7-8, add the remaining initiator, react at 60-65 ° C, then granulate, dry, Pulverized product two;

[0038] (3) Mix product 1 and product 2 to obtain a wall-solidifying agent.

[0039] In one embodiment of the present invention, in step (1), the amount of distilled water added is 1 / 3-2 / 3 of the total mass.

[0040] In one embodiment of the present invention, in step (1), the amount of the initiator added is 1 / 3-2 / 3 of the total mass.

[0041] In one embodiment of the present invention, in step (1), the b...

Embodiment 1

[0047] Example 1 A method for preparing a wall-solidifying agent for drilling fluid, comprising the following steps, the raw materials used are calculated in parts by mass:

[0048] (1) Add 40 parts of distilled water, 20 parts of acrylamide, and 20 parts of DMDAAC into the reaction kettle, stir evenly, raise the temperature to 65-70°C, slowly add adhesives (10 parts of vinyl acetate and 10 parts of polyvinyl alcohol), drop Adding control time is 30 minutes, add 1 part of ammonium persulfate (make ammonium persulfate into a 5% solution), turn on the cooling water, keep the temperature of the material at 65-70°C and polymerize for 3 hours to obtain product 1.

[0049] (2) Add 50 parts of distilled water, 12 parts of sodium hydroxide, and 5 parts of sodium formate into the reaction kettle and stir until completely dissolved, then add 2 parts of AMPS and stir for 30 minutes, then add 2 parts of acrylic acid and stir evenly, and adjust the pH value to 7- 8. Stir for 60 minutes, ...

Embodiment 2

[0051] Example 2 With embodiment 1, difference is that binder is 20 parts of vinyl acetates.

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Abstract

The invention provides a wall fixing agent for drilling fluid as well as a preparation method and application of the wall fixing agent and belongs to the technical field of drilling fluid. The wall fixing agent for the drilling fluid is prepared from the following raw materials in parts by weight: 10 to 25 parts of acrylamide; 10 to 25 parts of an adhesive; 10 to 25 parts of dimethyl diallyl ammonium chloride; 1 to 5 parts of acrylic acid; 1 to 5 parts of 2-acrylamide-2-methylpropanesulfonic acid; 1 to 5 parts of a chain transfer agent; 2 to 5 parts of an initiator; 5 to 12 parts of sodium hydroxide; and 80 to 100 parts of distilled water. According to the wall fixing agent provided by the invention, the strength of well wall rock is improved by enhancing cohesive force and adhesive forceamong rock particles, so that the anti-collapse performance of the drilling fluid is improved. Particularly, the hydration force and the like of the shale during hydration expansion can be weakened orcompletely counteracted by the cohesion of a bionic shell, so that the stability of a well wall is improved, and the wall fixing agent has relatively good adhesion performance in a water environment.

Description

technical field [0001] The invention belongs to the technical field of drilling fluids, and in particular relates to a wall-solidifying agent for drilling fluids and a preparation method and application thereof. Background technique [0002] During the drilling construction process, due to the complexity and diversity of the formation, the problem of wellbore instability has always been a technical problem that researchers at home and abroad are committed to solving. [0003] At present, some researchers are committed to screening drilling fluid treatment agents with less effective stress damage to shale, and stabilizing the wellbore by improving the mechanical strength of the wellbore shale. [0004] Some researchers are committed to developing viscous cementing agents, which can improve the compressive strength of the well wall and prevent the well wall from collapsing by forming a viscous substance on the rock surface. For example, CN106634884B discloses a biomimetic wal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575
CPCC09K8/5753
Inventor 冯海平赵玉浩赵俊岭郭中文余进于德成卓绿燕杜庆福赵诚
Owner BEIJING SHIDABOCHENG TECH
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