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A high-temperature-resistant and degradable gel plugging system for protecting reservoirs and its preparation and application

A technology of high temperature resistance and storage protection, applied in the field of drilling fluid plugging, can solve the problems of high plugging strength, difficult to degrade, and the inability to obtain gel plugging agents, and achieves good high temperature stability, fast gelation time, excellent The effect of temperature resistance

Active Publication Date: 2021-12-07
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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  • A high-temperature-resistant and degradable gel plugging system for protecting reservoirs and its preparation and application
  • A high-temperature-resistant and degradable gel plugging system for protecting reservoirs and its preparation and application
  • A high-temperature-resistant and degradable gel plugging system for protecting reservoirs and its preparation and application

Examples

Experimental program
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Effect test

preparation example 1

[0075] Method for preparing superfluence temperature polymer, including steps as follows:

[0076] (1) 5.16 g of maleic anhydride, 13.76 g 1-oadiene and 0.34 g of oxide dibenzoyloylipositis were added in 20 ml of xylene, and stirred at a rate of 800 rpm at 90 ° C to completely dissolve, resulting in a solution A;

[0077] (2) Take 4 g of Subethylene Tetaine slowly added to 10 ml of xylene, the dropwise time was 5 min, stirred at a rate of 200 rpm to completely dissolve, resulting in solution B;

[0078] (3) Slowly add 4 ml of solution B to the solution A obtained from step (1), a dropwatering time of 10 min, and after the stirring rate is 1000 rpm, the temperature is at 60 ° C for 4 hours, and after the reaction is completed, Decamination of the solvent, the obtained solid phase material is dried to granulate, and the yellow powder is obtained as a superblycene-resistant polymer.

[0079] Infrared spectrum characterized by infrared spectroscopy using infrared spectroscopy, and its i...

preparation example 2

[0081] Nano SiO 2 The preparation method, including the steps as follows:

[0082] (A) 2 ml of span80, 8ml n-pentane, 1 ml n-butanol is mixed uniform, resulting in a solution ; Then the solution Placed on a magnetic stirrer, slowly dropped 1 ml of deionized water under stirring, the dropwater was 3 min, and after the system was dispersed, transferred into the glass bottle, placed in a constant temperature water bath at 30 ° C for 24 h, resulting Microemulsion ;

[0083] (B) under stirring, to microemulsion The tetramethylene silicate is added dropwise, and the amount of titration time is 10 min, and the volume of tetramethyl is microemulsion. The volume was 3%, and the mixture was stirred during the dropwise addition, stirred and meticulous, transferred to a constant temperature water bath in a constant temperature of 30 ° C for 1 h, resulting in microemulsion ;

[0084] (C) to microemulsion Add anhydrous ethanol, add time of 15 min, and the volume of absolute ethanol is mi...

Embodiment 1

[0087] A anti-high temperature degradable gel plug system for protecting reservoirs, including the following mass percentage of raw materials:

[0088] The vinyl polymerization monomer is 15%, super-crosslinking temperature resistant polymer 1%, an organic crosslink agent 0.9%, first initiator 0.2%, high temperature stabilizer 5%, fiber toughening agent 3%, and margin;

[0089] Among them, the vinyl polymerization monomer is an acrylamide; an organic crosslinking agent is a mass ratio of interproxinol and hexamethylenetetramine, amphotyldhenol, and hexamethylenetetramine is 1: 2; first initiation Sodium hydrogen sulfate and ammonium persulfate, the two mass ratios are 1: 1; high temperature stabilizers are nano-SiO 2 And thiourea, nanometer SiO 2 And the mass ratio of thiourea is 1: 2; the fiber toughening agent is a polyamide fiber.

[0090] The anti-high temperature degradable gel plug system is prepared by the anti-high temperature degradable gel plug system, including the step...

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Abstract

The invention provides a high-temperature-resistant and degradable gel plugging system for protecting reservoirs, as well as its preparation and application. The gel plugging system includes the following raw materials in mass percentage: 8-25% of vinyl polymerized monomer, 0.4-1.2% of hypercross-linked heat-resistant polymer, 0.3-1% of organic cross-linking agent, the first initiator 0.05-0.4%, high-temperature stabilizer 1-7%, fiber toughening agent 0.5-5%, and the balance is water; the super-crosslinked temperature-resistant polymer is a super-crosslinked polymer with amide groups on the surface thing. The invention also provides a preparation method of the gel plugging system. The gel plugging system of the present invention has high gelling strength and excellent viscoelastic properties, can quickly cross-link and solidify in ultra-high temperature loss formations, and effectively plug different pores and cracks; and the gel system obtained after gelation is easy to use in relatively The gel is broken in a short time, and the measures for breaking the gel are simple, which can effectively protect the oil and gas reservoir.

Description

Technical field [0001] The present invention relates to a method of protecting a high-temperature reservoir degradable gel preparation and application system and plugging, plugging technical field belonging to the drilling fluid. Background technique [0002] Lost circulation is one of the underground complex issue of oil and gas exploration and development, the formation of different types of drilling fluid loss occurs, the impact drilling speed, increased drilling costs, and loss of drilling fluid into the formation will destroy the reservoir permeability, reducing oil and gas fields oil recovery, oil and gas extraction is a problem that must be faced. Dropout according lost circulation passage into permeability loss, fracture loss, cracking and leakage solvable four dropout, wherein fractured, the most serious leakage solvable. [0003] As technology continues to improve plugging, plugging materials range more widely. Plugging gel is an effective means of controlling leakage o...

Claims

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Application Information

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Patent Type & Authority Patents(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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