A temperature-resistant, high-efficiency waterproof locking agent for fracturing tight gas reservoirs and its application

A technology of water-proof locking agent and dense gas, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not being able to eliminate water-locking damage, reduce capillary resistance, increase recovery rate and production, and low cost Effect

Active Publication Date: 2022-05-20
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the different geological conditions of different tight gas reservoirs, there are also differences in the performance requirements of the fracturing boosting waterproof lock. Therefore, for the low porosity (2.91%) and ultra-low permeability ( 0.001~0.33mD), high reservoir temperature of 150℃ and strong hydrophilicity of shale interface, the existing waterproof locking agent for fracturing synergy cannot meet the requirements of eliminating water locking damage and improving gas recovery, and must Specifically developed a specific water-removing lock agent

Method used

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  • A temperature-resistant, high-efficiency waterproof locking agent for fracturing tight gas reservoirs and its application
  • A temperature-resistant, high-efficiency waterproof locking agent for fracturing tight gas reservoirs and its application

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Embodiment 1

[0043] A waterproof locking agent for tight gas reservoir fracturing, comprising the following components by mass percentage: 0.3% perfluorooctylsulfonamide polyoxyethylene ether nonionic surfactant, perfluorononylenoxybenzenesulfonic acid Salt 0.4%, branched chain dodecylbenzene sulfonate surfactant 0.3%, potassium formate 13.0%, isopropanol 15%, mineralized water 71.0%.

Embodiment 2

[0045] A waterproof locking agent for tight gas reservoir fracturing, comprising the following components by mass percentage: 0.6% perfluorooctylsulfonamide polyoxyethylene ether nonionic surfactant, perfluorononylenyloxybenzenesulfonic acid Salt 0.1%, branched chain dodecylbenzene sulfonate surfactant 0.3%, potassium formate 13.0%, isopropanol 15%, mineralized water 71.0%.

Embodiment 3

[0047] A waterproof locking agent for tight gas reservoir fracturing, comprising the following components by mass percentage: 0.6% perfluorooctylsulfonamide polyoxyethylene ether nonionic surfactant, perfluorononylenyloxybenzenesulfonic acid Salt 0.8%, branched chain dodecylbenzene sulfonate surfactant 0.6%, potassium formate 13.0%, isopropanol 15%, mineralized water 70.0%.

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Abstract

The invention discloses a temperature-resistant, high-efficiency waterproof locking agent for dense gas reservoir fracturing, which comprises the following components in terms of mass percentage: 0.3-2.0% of fluorocarbon nonionic surfactant; perfluorononylene Oxybenzenesulfonate 0.1-1.0%; Branched-chain dodecylbenzenesulfonate 0.3-1.0%; Short-chain alcohol 10-25%; Organic carboxylate 6-13%; Mineralized water 60-83% . It has the advantages of strong temperature resistance, small solution particle size, excellent surface / interface performance, good wetting performance, low use concentration and strong waterproof locking ability. The surface tension of the aqueous solution with a concentration of 0.2-0.5% is less than 21mN / m , the particle size of the solution is less than 40nm, and the waterproof locking ability is greater than 85%, which has great application prospects in the synergistic mining of tight gas fracturing. The invention also discloses the application of the waterproof locking agent.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas exploitation. More specifically, it relates to a temperature-resistant, high-efficiency waterproof locking agent for fracturing tight gas reservoirs and its application. Background technique [0002] At present, the effective method for unconventional oil and gas recovery in the world is to implement horizontal drilling and fracturing efficiency enhancement technology. In fracturing operation, the flowback volume of fracturing fluid is an important factor affecting the effect of fracturing operation and oil and gas stimulation. After the fracturing operation is completed, the well is opened and flowed back. Due to the poor permeability and porosity of the tight oil and gas formation, part of the pressure fluid is bound in the reservoir due to capillary force, making it difficult to drain the fluid, resulting in formation damage. If the fracturing fluid cannot be completely discharged fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/604C09K8/602C09K8/68C09K8/885C09K2208/12
Inventor 徐志成靳志强宫清涛刘子瑜张磊罗澜张路赵濉
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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