High-temperature-resistant degradable gel leaking stoppage system for protecting reservoir and preparation and application thereof

A technology of high temperature resistance and storage protection, applied in the field of drilling fluid plugging, can solve the problems of unavailability of gel plugging agent, difficult to degrade, high plugging strength, etc., and achieve excellent temperature resistance, fast gelation time, high temperature good stability

Active Publication Date: 2021-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the existing technology, especially the existing gel plugging agent cannot obtain high plugging strength and is difficult to degrade under high temperature conditions, the present invention provides a high-temperature-resistant and degradable gel for protecting reservoirs. Glue plugging system and its preparation and application

Method used

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  • High-temperature-resistant degradable gel leaking stoppage system for protecting reservoir and preparation and application thereof
  • High-temperature-resistant degradable gel leaking stoppage system for protecting reservoir and preparation and application thereof
  • High-temperature-resistant degradable gel leaking stoppage system for protecting reservoir and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0075] A preparation method of hypercrosslinked heat-resistant polymer, comprising steps as follows:

[0076] (1) Add 5.16g of maleic anhydride, 13.76g of 1-octadecene and 0.34g of dibenzoyl peroxide into 20mL of xylene, stir at 90°C at a speed of 800 rpm until completely dissolved, and obtain a solution A;

[0077] (2) Slowly add 4g of triethylenetetramine into 10mL of xylene dropwise for 5 minutes, and stir at a rate of 200 rpm until completely dissolved to obtain solution B;

[0078] (3) Slowly add 4mL of solution B to the solution A obtained in step (1) for 10 minutes, and then react for 4 hours at a stirring rate of 1000 rpm and a temperature of 60°C. After the reaction, spin The solvent was removed by evaporation, and the obtained solid phase material was dried and then granulated to obtain a yellow powder which was a hypercrosslinked temperature-resistant polymer.

[0079] Using infrared spectroscopy to carry out infrared spectrum characterization of the prepared hyperc...

preparation example 2

[0081] A kind of nano-SiO 2 The preparation method comprises steps as follows:

[0082] (a) Mix 2mL Span80, 8mL n-pentane, and 1mL n-butanol evenly to obtain a solution ; then the solution Place it on a magnetic stirrer, slowly add 1mL of deionized water dropwise under the stirring condition, and the dropping time is 3min. microemulsion ;

[0083] (b) Under stirring conditions, the microemulsion Slowly add tetramethyl orthosilicate dropwise in the medium, the dropping time is 10min, the volume of tetramethyl orthosilicate is microemulsion 3% of the volume, and keep stirring at a constant speed during the dropping process. After stirring evenly, transfer it to a 30°C constant temperature water bath for 1h to obtain a microemulsion ;

[0084] (c) Microemulsion Add dehydrated ethanol dropwise to the medium, the dropping time is 15min, the volume of dehydrated alcohol is microemulsion 5% of the volume. After shaking well, the system was centrifuged at a high speed...

Embodiment 1

[0087] A high-temperature-resistant and degradable gel plugging system for protecting reservoirs, comprising the following raw materials in mass percentages:

[0088] 15% vinyl polymer monomer, 1% hypercrosslinked heat-resistant polymer, 0.9% organic crosslinking agent, 0.2% first initiator, 5% high temperature stabilizer, 3% fiber toughening agent, and the balance is water;

[0089] Wherein, the vinyl polymerization monomer is acrylamide; the organic crosslinking agent is resorcinol and hexamethylenetetramine, and the mass ratio of resorcinol and hexamethylenetetramine is 1:2; the first initiation agent sodium bisulfite and ammonium persulfate, the mass ratio of the two is 1:1; the high temperature stabilizer is nano-SiO 2 and thiourea, nano-SiO 2 The mass ratio to thiourea is 1:2; the fiber toughening agent is polyamide fiber.

[0090] The preparation method of the above-mentioned high-temperature-resistant and degradable gel plugging system for protecting the reservoir co...

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Abstract

The invention provides a high-temperature-resistant degradable gel leaking stoppage system for protecting a reservoir and preparation and application thereof. The gel leaking stoppage system is prepared from the following raw materials in percentage by mass: 8 to 25 percent of vinyl polymeric monomer, 0.4 to 1.2 percent of super-crosslinking temperature-resistant polymer, 0.3 to 1 percent of organic crosslinking agent, 0.05 to 0.4 percent of first initiator, 1 to 7 percent of high-temperature stabilizer, 0.5 to 5 percent of fiber toughening agent and the balance of water, the super-crosslinking temperature-resistant polymer is a super-crosslinking high-molecular polymer with an amide group on the surface. The invention also provides a preparation method of the gel leaking stoppage system. The gel leaking stoppage system has high gelling strength and excellent viscoelasticity, and can be quickly cross-linked and cured in an ultra-high-temperature leakage formation to effectively plug different pores and fractures; and a gel system obtained after gelling is easy to break in a short time, the gel breaking measure is simple, and an oil and gas reservoir is effectively protected.

Description

technical field [0001] The invention relates to a high-temperature-resistant and degradable gel plugging system for protecting reservoirs, its preparation and application, and belongs to the technical field of drilling fluid plugging. Background technique [0002] Lost circulation is one of the complex downhole problems in the current oil and gas exploration and development process. Drilling fluid loss will occur in different types of formations, which will affect the drilling speed and increase drilling costs. After the lost drilling fluid enters the formation, it will damage the reservoir permeability and reduce the oil and gas field. Recovery factor is a problem that must be faced in oil and gas exploitation. The lost circulation problem is divided into four categories according to the lost channel: permeable lost, fractured lost, dissolved vug lost and fractured lost, among which fractured and dissolved vug lost are the most serious. [0003] With the continuous improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/512C09K8/03C08F255/08C08F220/56C08F220/58C08F220/14
CPCC09K8/426C09K8/512C09K8/03C08F255/08C09K2208/10C09K2208/08C08F220/56C08F220/585C08F220/14
Inventor 白英睿王枫孙金声吕开河韩金良许成元雷少飞杨景斌王金堂黄贤斌刘敬平金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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