Long-acting mixed fluorocarbon surfactant treating agent for improving condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent

A surface active agent and fluorocarbon surface technology, which is applied to the drilling composition, production fluid, earthwork drilling and production, etc., can solve the problems of low recovery rate and short validity period, and achieve enhanced recovery rate, long validity period, The effect of reducing processing costs

Active Publication Date: 2014-06-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the existing condensate gas reservoir mining technology has a low recovery rate, is prone to water lock, and the existing surfactant wetting reversal technology has a short validity period, the present invention provides a long-acting mixed fluorine that can be tightly adsorbed on the rock surface. carbon surfactant

Method used

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  • Long-acting mixed fluorocarbon surfactant treating agent for improving condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent
  • Long-acting mixed fluorocarbon surfactant treating agent for improving condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent
  • Long-acting mixed fluorocarbon surfactant treating agent for improving condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1: long-acting mixed fluorocarbon surfactant treatment agent, raw material components are as follows by mass percentage:

[0059] Nonionic Fluorocarbon Surfactant CF 3 (CF 2 ) 7 (CH 2 CH 2 O) 20 H0.1%, zwitterionic fluorocarbon surfactant DF-9210.1%, nonionic hydrocarbon surfactant OP-200.1%, ethanol 20%, and the rest is water.

[0060] Mix the above components evenly to obtain the treatment agent, and the solution of the treatment agent remains clear and transparent at 140°C.

[0061] Apply the above treatment agent to the condensate gas reservoir and inject it into the core with an injection rate of 0.3PV.

Embodiment 2

[0062] Embodiment 2: long-acting mixed fluorocarbon surfactant treatment agent, raw material components are as follows by mass percentage:

[0063] Nonionic Fluorocarbon Surfactant CF 3 (CF 2 ) 7 (CH 2 CH 2 O) 15 H0.15%, zwitterionic fluorocarbon surfactant FSK0.1%, non-ionic hydrocarbon surfactant Pingping plus O-200.1%, methanol 20%, and the rest is water.

[0064] Apply the above-mentioned treatment agent to the condensate gas reservoir to inject the core, and the injection volume is 0.3PV.

Embodiment 3

[0065] Embodiment 3: long-acting mixed fluorocarbon surfactant treatment agent, raw material components are as follows by mass percentage:

[0066] Nonionic Fluorocarbon Surfactant CF 3 (CF 2 ) 7 (CH 2 CH 2 O) 20 H0.1%, zwitterionic fluorocarbon surfactant (DF-921) 0.15%, non-ionic hydrocarbon surfactant OP-200.2%, ethylene glycol 25%, and the rest is water.

[0067] The above-mentioned treatment agent is applied to the condensate gas reservoir to inject the core, and the injection volume is 0.2-0.3PV.

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Abstract

The invention relates to a long-acting mixed fluorocarbon surfactant treating agent for improving the condensate gas reservoir recovery efficiency and application of mixed fluorocarbon surfactant treating agent. The mixed fluorocarbon surfactant treating agent comprises the following components in parts by weight: 0.05-0.3% of nonionic fluorocarbon surfactant, 0.05-0.3% of zwitter-ion fluorocarbon surfactant, 0.05-0.3% of nonionic hydrocarbon surfactant, 5-30% of alcohol, and the balance of water. The mixed fluorocarbon surfactant treating agent is capable of forming a compact adsorption film on the rock surface to construct a good airflow channel, the gas phase permeability of a stratum is improved, the displacement efficiency of the gas drive is obviously improved, and the validity is long. The invention further provides the application of the mixed fluorocarbon surfactant treating agent, the mixed fluorocarbon surfactant treating agent is applied to the condensate gas reservoir, the water blocking is prevented, the recovery efficiency is improved, the injection amount injected into rock core or stratum is 0.2-0.4PV, and the gas drive recovery rate can be improved to 40-78% under different temperature.

Description

technical field [0001] The invention relates to the technical field of gas reservoir mining and production increase, in particular to a long-acting mixed fluorocarbon surfactant treatment agent and a method for improving the recovery rate of condensate gas reservoirs by using the mixed fluorocarbon surfactant. Background technique [0002] Condensate gas reservoirs in my country have the characteristics of high salinity edge-bottom water, deep burial, high temperature, and small ground exposure pressure difference. They are medium-low permeability and medium-high condensate oil content condensate gas reservoirs. The depletion-type development was adopted in the early stage. With the drop of pressure and the advancement of edge and bottom water, the formation water and foreign well fluids are prone to liquid lock effect during the production process, resulting in a sharp drop in gas well productivity and a rapid increase in water cut, which seriously restricts gas reservoirs a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/594E21B43/16
Inventor 王彦玲金家锋蒋官澄
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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