A temperature-sensitive adhesive bridging plugging system, plugging slurry and its preparation method and application

A temperature-sensitive adhesion type, bridging plugging technology, applied in chemical instruments and methods, instruments, computer materials science, etc., can solve the problems of low plugging success rate, poor adhesion of crack wall, damage, etc., to achieve enhanced Plugging strength and stability, stable melting temperature, and the effect of overcoming low strength

Active Publication Date: 2022-05-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used bridging plugging materials include rigid calcium carbonate particles, elastic particles, flexible fibers, etc. The prepared bridging plugging slurry has achieved good application results for plugging in permeable and micro-fractured leakage formations, but for large The plugging of fractured leakage formations generally has problems such as low success rate of one-time plugging and high frequency of re-leakage
According to statistics, the global bridging plugging success rate is less than 40%.
However, the above plugging agent is a plugging layer formed by the pressure difference between the wellbore fluid column and the formation. It has poor adhesion to the fracture wall and is easily damaged by pressure fluctuations, resulting in re-leakage.

Method used

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  • A temperature-sensitive adhesive bridging plugging system, plugging slurry and its preparation method and application
  • A temperature-sensitive adhesive bridging plugging system, plugging slurry and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0071] A temperature-sensitive adhesive bridging plugging system, comprising the following raw materials in mass percentage: 40% of temperature-sensitive adhesive resin particles, 25% of rigid particle materials, 25% of elastic particle materials, and 10% of fiber materials;

[0072] Wherein, the rigid particle material is walnut shell particles; the elastic particle material is rubber particles; the fiber material is polyamide fiber;

[0073] The temperature-sensitive adhesive resin particles are prepared according to the following method:

[0074] (1) Preparation of modified solid-phase filled melting range modifiers

[0075] Add 25g of oven-dried silicon dioxide (90nm particle size) into 500mL of dichloromethane, and ultrasonically disperse for 30min to obtain a suspension a; add 20mL of vinyltrimethoxysilane dropwise to the suspension a for a time of 30 minutes, ultrasonic dispersion for 10 minutes to obtain a suspension b, then stand at 70°C for 8 hours, centrifuge, and ...

Embodiment 2

[0088] A temperature-sensitive adhesive bridging plugging system, comprising the following raw materials in mass percentage: 40% of temperature-sensitive adhesive resin particles, 25% of rigid particle materials, 25% of elastic particle materials, and 10% of fiber materials;

[0089] Wherein, the rigid particle material is walnut shell particles; the elastic particle material is rubber particles; the fiber material is polyamide fiber;

[0090] The preparation method of the temperature-sensitive adhesive resin particles is as follows:

[0091] (1) Preparation of modified solid-phase filled melting range regulator:

[0092] Add 25g of dried zeolite powder (with a particle size of 10μm) into 500mL of dichloromethane, and ultrasonically disperse for 30min to obtain suspension a; add 20mL of vinyltrimethoxysilane dropwise to suspension a for 30min , ultrasonically dispersed for 10 minutes to obtain a suspension b, then left to react at 70°C for 8 hours, centrifuged, and vacuum-dri...

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Abstract

The invention provides a temperature-sensitive adhesive bridging plugging system, a plugging slurry, a preparation method and application thereof. The temperature-sensitive adhesive bridging plugging system of the present invention is characterized in that it comprises the following raw materials in mass percentage: 20-50% of temperature-sensitive adhesive resin particles, 20-30% of rigid granular materials, and 20-30% of elastic granular materials 30%, fiber material 10‑20%. The present invention also provides a method for preparing lost circulation slurry, comprising the steps of: adding temperature-sensitive adhesive resin particles, rigid particle materials and elastic particle materials into clear water or drilling fluid, stirring at high speed until uniform dispersion; then adding fiber The materials are stirred at a low speed until they are uniformly dispersed, and then the temperature-sensitive adhesive bridging plugging slurry is obtained. The plugging slurry of the present invention has a high success rate of one-time plugging and effectively avoids re-leakage, and overcomes the problems of low strength of the accumulated plugging layer formed in cracks by conventional bridging plugging materials and being easily affected by pressure fluctuations, resulting in plugging failure.

Description

technical field [0001] The invention relates to a temperature-sensitive adhesive bridging plugging system, a plugging slurry and a preparation method and application thereof, belonging to the technical field of oil and gas drilling. Background technique [0002] Lost circulation is a common phenomenon in the process of oil drilling. According to statistics, the occurrence rate of lost circulation accounts for 20% to 25% of the total number of wells in the world. Lost circulation will not only cause huge economic losses to the drilling project, but also lead to a serious drop in well pressure, which will have a great impact on the stability of the inner wall of the oil well. In severe cases, it will lead to blowout accidents, which seriously threaten the safety of drilling operations. sex. [0003] Aiming at well leakage accidents at home and abroad, plugging materials such as bridging, water-absorbing / oil-absorbing resin, curable, high-water loss, and polymer gel have been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44G16C60/00
CPCC09K8/426C09K8/44G16C60/00C09K2208/08C09K2208/04
Inventor 白英睿孙金声吕开河黄维安韩金良刘敬平王金堂黄贤斌金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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