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High-temperature-resistant capsule gel breaker for fracturing and preparation method thereof

A capsule breaker and high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of high cost, and achieve the effects of easy control of breaking time, good water resistance and delayed breaking performance.

Active Publication Date: 2020-11-03
XIAN AODE PETROCHEM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to fundamentally solve the contradiction between the cross-linking and gel breaking of fracturing fluid, the overseas Halliburton company developed the Optiflo-3 capsule technology, and the domestic fracturing acidification center developed the NBA-101 capsule gel breaker, both of which have better solved this problem. problem, but the cost is too high

Method used

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  • High-temperature-resistant capsule gel breaker for fracturing and preparation method thereof
  • High-temperature-resistant capsule gel breaker for fracturing and preparation method thereof
  • High-temperature-resistant capsule gel breaker for fracturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 Capsule breaker for high temperature fracturing

[0032] In the capsule gel breaker (capsule coat is capsule coat A), potassium persulfate accounts for 30% of the total mass of the capsule gel breaker, polyvinyl alcohol accounts for 5% of the total mass of the capsule gel breaker, and lecithin accounts for 5% of the total mass of the capsule gel breaker. 1% of the total mass, and the balance is the coating material.

[0033] The preparation method of high temperature resistant capsule gel breaker:

[0034] S1. After mixing potassium persulfate, polyvinyl alcohol, and lecithin uniformly in proportion, add them into water according to the solid-to-liquid ratio of 1:1g / mL, and disperse them uniformly by ultrasonic at an ultrasonic power of 1000W to obtain a feed liquid;

[0035] S2. Dissolve 100g of linear polystyrene, 15g of polyisopropylacrylamide, and 5g of p-bis(chloromethyl)benzene in 200mL of ethyl acetate-acetone mixture (the volume ratio of ethyl acet...

Embodiment 2

[0038] Example 2 Capsule gel breaker for high temperature resistant fracturing

[0039] In the capsule gel breaker (capsule coat is capsule coat A), the cellulose glycoside bond-specific enzyme accounts for 70% of the total mass of the capsule gel breaker, polyvinylpyrrolidone accounts for 10% of the total mass of the capsule gel breaker, and octylbenzene Cycloxanol accounts for 6% of the total mass of the capsule gel breaker, and the balance is the capsule coating material;

[0040] The preparation method of high temperature resistant capsule gel breaker:

[0041] S1. After mixing the cellulose glucoside-specific enzyme, polyvinylpyrrolidone, and octoxynol in proportion, add it into water according to the solid-to-liquid ratio of 1:3g / mL, and disperse until uniform under the ultrasonic power of 2000W. get liquid;

[0042] S2. Dissolve 100g of linear polystyrene, 35g of polyisopropylacrylamide, and 12g of p-bis(chloromethyl)benzene in 200mL of ethyl acetate-acetone mixture (...

Embodiment 3

[0045] Example 3 Capsule gel breaker for high temperature resistant fracturing

[0046] In the capsule gel breaker (capsule coat is capsule coat A), sodium persulfate accounts for 50% of the total mass of the capsule gel breaker, polyvinyl alcohol accounts for 7% of the total mass of the capsule gel breaker, and polyacrylamide accounts for 50% of the total mass of the capsule gel breaker. 3% of the total mass of the agent, and the balance is the capsule coating material.

[0047] The preparation method of high temperature resistant capsule gel breaker:

[0048] S1. After mixing sodium persulfate, polyvinyl alcohol, and polyacrylamide uniformly in proportion, add them into water according to the solid-to-liquid ratio of 1:2g / mL, and disperse them until uniform by ultrasonic at an ultrasonic power of 1500W to obtain a material liquid;

[0049] S2. Dissolve 100g of linear polystyrene, 25g of polyisopropylacrylamide, and 7g of p-bis(chloromethyl)benzene in 200mL of ethyl acetate-...

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Abstract

The invention provides a capsule gel breaker for high-temperature fracturing, the capsule gel breaker takes an active substance, a dispersing agent and an emulsifying agent as a capsule core, a capsule coating is a capsule coating A or a capsule coating B, and the capsule coating A is prepared by reacting linear polystyrene with polyisopropylacrylamide and p-bis(chloromethyl)benzene; the capsule coating B is prepared from sodium carboxymethyl cellulose, polyvinyl alcohol, polyesteramide, acrylic resin, Tween 80, triethyl citrate, stearic acid, ethanol and water. The capsule gel breaker is uniform in particle and good in smoothness, the selected membrane material has delayed degradation and temperature resistance and water repellency, and the problem that the application range of the capsule gel breaker is limited is solved.

Description

technical field [0001] The invention relates to the technical field of capsule gel breakers, in particular to a capsule gel breaker for high temperature resistant fracturing and a preparation method thereof. Background technique [0002] Before the water-based or emulsified fracturing fluid enters or flows back out of formation fractures, there are special requirements for the retention and breaking viscosity of the fracturing fluid. However, it is difficult for conventional ammonium persulfate (APS) breakers to meet the requirements of both. The purpose of using a gel breaker is to release the viscosity maintained by the fracturing fluid and reduce the oil layer damage caused by the water-based or emulsified fracturing fluid. When the amount of APS breaker added to the fracturing fluid is too much, the exposed APS breaker will directly contact with the jelly fracturing fluid, which will soon cause the viscosity of the jelly to drop, weaken the sand-carrying ability, and af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/70C08J3/24C08L25/06C08L33/24
CPCC09K8/706C08J3/246C09K2208/24C09K2208/26C08J2325/06C08J2433/24
Inventor 张卫东李健倪兴双
Owner XIAN AODE PETROCHEM ENG TECH CO LTD
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