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Temperature-resistant high-efficiency tight gas reservoir fracturing waterproof locking agent and application thereof

A technology of waterproof locking agent and dense gas, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem of not being able to eliminate the damage of water locking, and achieve lower capillary resistance, convenient use and good wetting performance. Effect

Active Publication Date: 2021-08-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • 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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  • Temperature-resistant high-efficiency tight gas reservoir fracturing waterproof locking agent and application thereof
  • Temperature-resistant high-efficiency tight gas reservoir fracturing waterproof locking agent and application thereof
  • Temperature-resistant high-efficiency tight gas reservoir fracturing waterproof locking agent and application thereof

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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 tight gas reservoir fracturing waterproof locking agent which comprises the following components in percentage by mass: 0.3-2.0% of a fluorocarbon nonionic surfactant, 0.1-1.0 % of perfluorononyl alkenyloxy benzene sulfonate; 0.3-1.0% of branched chain dodecyl benzene sulfonate; 10-25 % of short-chain alcohol; 6-13% of an organic carboxylate; and 60-83% of mineralized water. The waterproof locking agent has the advantages of being high in temperature resistance, small in solution particle size, excellent in surface / interface performance, good in wettability, low in use concentration and high in water-blocking-resistant capacity; the surface tension of an aqueous solution with the concentration being 0.2-0.5% is smaller than 21 mN / m, the solution particle size is smaller than 40 nm, and the water-blocking-resistant capacity is larger than 85%; and the waterproof locking agent has a huge application prospect in tight gas fracturing synergistic exploitation. The invention also discloses an 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 Applications(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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