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Plugging agent for environment-friendly water-based drilling fluid and preparation method of plugging agent

A water-based drilling fluid, an environmentally friendly technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of less environmentally friendly plugging agent products, achieve good compatibility, high compressive strength, and plugging good effect

Active Publication Date: 2017-12-22
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

Through continuous efforts, great progress has been made in the environmental protection of drilling fluids over the years, but there are still relatively few good environmental protection plugging agents

Method used

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  • Plugging agent for environment-friendly water-based drilling fluid and preparation method of plugging agent
  • Plugging agent for environment-friendly water-based drilling fluid and preparation method of plugging agent
  • Plugging agent for environment-friendly water-based drilling fluid and preparation method of plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for an environment-friendly water-based drilling fluid plugging agent, comprising the following steps:

[0029] 1) Dissolve glucose in deionized water to make a glucose solution, then transfer the glucose solution to a tetrafluoroethylene-lined hydrothermal synthesis kettle, react at 160°C for 6 hours, cool to room temperature after the reaction, and centrifugally filter , washed three times with deionized water, and dried to obtain carbon spheres, such as figure 1 shown.

[0030] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimethylammonium bromide to the solution, Stir until the solution is clear, then add the prepared carbon spheres into the four-neck flask while stirring, heat at 90°C and stir for 5 hours, cool to room temperature, wash with deionized water three times, and dry to obtain AlOOH-coated c...

Embodiment 2

[0033] A preparation method for an environment-friendly water-based drilling fluid plugging agent, comprising the following steps:

[0034] 1) The difference from Example 1 is that the hydrothermal reaction condition is to react at 180° C. for 4 hours.

[0035] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimethylammonium bromide to the solution, Stir until the solution is clear, then add the carbon spheres prepared in step 1 into a four-necked flask while stirring, heat at 100°C and stir for 3 hours, cool to room temperature, wash with deionized water three times, and dry to obtain a coated Carbon spheres of AlOOH.

[0036] 3) Add deionized water, 50 parts of AlOOH-coated carbon spheres, 10 parts of acrylamide, 10 parts of N-isopropylacrylamide, 4 parts of hexamethylenetetramine into a four-neck flask equipped with a mechanical stir...

Embodiment 3

[0038] A preparation method for an environment-friendly water-based drilling fluid plugging agent, comprising the following steps:

[0039] 1) The difference from Example 1 is that the hydrothermal reaction condition is to react at 170° C. for 5 hours.

[0040] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimethylammonium bromide to the solution, Stir until the solution is clear, then add the carbon spheres prepared in step 1 into a four-neck flask while stirring, heat at 95°C and stir for 4 hours, cool to room temperature, wash with deionized water three times, and dry to obtain a coated Carbon spheres of AlOOH.

[0041]3) Add deionized water, 40 parts of AlOOH-coated carbon spheres, 9 parts of acrylamide, 9 parts of N-isopropylacrylamide, and 3 parts of hexamethylenetetramine into a four-neck flask equipped with a mechanical stirre...

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Abstract

The invention discloses a plugging agent for environment-friendly water-based drilling fluid and a preparation method of the plugging agent. A product is obtained from a reaction of, by weight, 30-50 parts of carbon balls coated with AlOOH, 10-20 parts of acrylamide, 10-20 parts of N-isopropylacrylamide and 2-4 parts of hexamethylenetetramine under the action of 0.01-0.05 part of initiator, and the plugging agent for the environment-friendly water-based drilling fluid is obtained by mixing the product and 30-50 parts of vinyl acetate-ethylene copolymer emulsion under the action of 2-5 parts of dispersant. The plugging agent for the environment-friendly water-based drilling fluid has the advantages of good plugging effect, no toxic effect, certain compressive strength, high temperature-resistance capability and good compatibility with the drilling fluid.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to an environment-friendly water-based drilling fluid plugging agent and a preparation method thereof. Background technique [0002] During the drilling process, the liquid phase, solid phase particles and other additives in the drilling fluid will leak into the fractured formation, causing damage to the oil and gas reservoir, especially the leakage in the shale formation will cause the wellbore instability, etc. question. In order to prevent solid phase particles from migrating into the formation, the most direct and effective method is to add a plugging agent to the drilling fluid to seal the pores and cracks on the well wall rock, thereby reducing or eliminating the loss of drilling fluid into the formation . [0003] The existing drilling fluid plugging agents mainly include asphalt, paraffin and polyols. The particle size of these drilling fluid plugging agents cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/24C09K8/42C09K8/44
CPCC09K8/03C09K8/032C09K8/035C09K8/24C09K8/426C09K8/44C09K2208/18
Inventor 李广环张健龙涛马红郭立华王运动陈安亮苏君侯士立谷艳峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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