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A hot melt plugging agent, fluid while drilling and its preparation method and application

A plugging agent and hot-melt type technology, which is applied in the field of drilling fluid plugging, can solve the problems of high cost, poor adhesion between the plugging agent and the fracture wall, etc., and achieve improved efficiency, excellent plugging effect, and improved retention effect of ability

Active Publication Date: 2020-09-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned plugging agent has poor adhesion to the fracture wall, and mainly relies on its own components to fill each other to form a plugging layer. In order to improve its retention capacity in the fracture, it is necessary to increase the concentration, resulting in an increase in cost

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  • A hot melt plugging agent, fluid while drilling and its preparation method and application

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preparation example Construction

[0048] The second aspect of the present invention provides a method for preparing fluid while drilling, wherein the fluid while drilling comprises the hot-melt type lost circulation agent of the present invention, and the method comprises: (1) containing the hot-melt type lost circulation agent The modified asphalt granules, thermoplastic resin granules, and inorganic solid phase granules are added to clear water or base slurry and stirred at a high speed until uniform to obtain mixture I; (2) adding the flexible fibers contained in the hot-melt plugging agent to the Mixture I, and stirred at a low speed until uniform, to obtain the drilling fluid.

[0049] In order to make the asphalt particles, thermoplastic resin particles, and inorganic solid phase particles mix and disperse quickly and uniformly, the present invention uses a high stirring speed to mix the asphalt particles, thermoplastic resin particles, and inorganic solid phase particles. At the same time, since the fle...

Embodiment 1

[0069] Based on the total weight of 100mL of the plugging base slurry, the dosage of the lost circulation agent is 6% of the lost circulation base slurry.

[0070] Among them, the composition of each component of the plugging agent is as follows: the content of sulfuryl chloride modified asphalt particles I is 20wt%, the content of thermoplastic polyurethane resin particles I is 15wt%, the content of inorganic solid phase particles is 50wt%, and the modified superfine The content of polypropylene flexible fiber I is 15wt%.

[0071] Among them, the inorganic solid phase particles include ultrafine calcium carbonate, diatomite powder and hectorite powder, the particle diameter of ultrafine calcium carbonate is 250 mesh, the particle diameter of diatomite powder is 350 mesh, and the particle diameter of hectorite powder is 500 mesh ;

[0072] Wherein, based on the total weight of the inorganic solid particles, the content of superfine calcium carbonate is 50 wt%, the content of ...

Embodiment 2

[0078] Based on the total weight of 100mL of the plugging base slurry, the dosage of the lost circulation agent is 12% of the lost circulation base slurry.

[0079] Among them, the composition of each component of the plugging agent is as follows: the content of sulfuryl chloride modified asphalt particles II is 28wt%, the content of thermoplastic polyurethane resin particles II is 14wt%, the content of inorganic solid phase particles is 45wt%, ultrafine polypropylene The content of flexible fiber II is 13 wt%.

[0080]Among them, the inorganic solid phase particles include ultrafine calcium carbonate, diatomite powder and hectorite powder, the particle size of ultrafine calcium carbonate is 300 mesh, the particle size of diatomite powder is 400 mesh, and the particle size of hectorite powder is 500 mesh;

[0081] Wherein, based on the total weight of the inorganic solid particles, the content of ultrafine calcium carbonate is 30 wt%, the content of diatomite powder is 30 wt%,...

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Abstract

The invention relates to the field of drilling fluid plugging, and discloses a hot-melt plugging agent, wherein the plugging agent includes asphalt particles, thermoplastic resin particles, inorganic solid phase particles and flexible fibers. The present invention also discloses a method for preparing drilling fluid, wherein the drilling fluid contains the hot-melt lost circulation agent, and the method includes: (1) asphalt particles contained in the hot-melt lost circulation agent, Add thermoplastic resin particles and inorganic solid phase particles to clear water or base slurry and stir at high speed until uniform to obtain mixture I; (2) Add the flexible fibers contained in the hot-melt plugging agent to the mixture I, and Stir at a low speed until uniform to obtain the drilling fluid. The lost circulation agent drilling fluid has excellent high temperature resistance, and can realize excellent plugging performance in high temperature formations.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging, in particular to a hot-melt plugging agent, drilling fluid and its preparation method and application Background technique [0002] Lost circulation is one of the most common downhole complex problems in the drilling process at present. It directly reduces the drilling speed and increases the drilling cost, and is one of the main technical bottlenecks restricting the exploration and development speed of oil and gas, natural gas hydrate, geothermal and other reservoirs. [0003] Lost circulation may occur in different types of formations, among which, carbonate reservoirs (developed with fractures and caves) have the most serious loss and are also the most difficult to solve. Lost circulation while drilling technology is one of the commonly used and effective technologies to prevent and control fractured and malignant lost circulation. This technology adds a certain amount of lost circulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C09K8/03E21B33/13
Inventor 白英睿孙金声吕开河刘敬平黄贤斌王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)