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Fluorocarbon surfactant binary composite foam flooding system

A fluorocarbon surface and binary composite technology, which is applied in the direction of production fluid, drilling composition, wellbore/well components, etc., can solve the problem that foam flooding cannot be fully applied, cannot withstand high temperature and high salt, and has poor oil resistance, etc. problems, to achieve foam stability, strong oil resistance, excellent hydrophobic effect

Active Publication Date: 2011-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing foaming agents are hydrocarbon surfactants, which cannot withstand high temperature and high salt, so that foam flooding cannot be fully applied in some high-temperature and high-salt reservoir conditions, and these foam systems have poor oil resistance, which affects The effect of foam flooding on enhancing oil recovery through Jiamin effect

Method used

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  • Fluorocarbon surfactant binary composite foam flooding system
  • Fluorocarbon surfactant binary composite foam flooding system
  • Fluorocarbon surfactant binary composite foam flooding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] [Example 1] The composition of the oil displacement system is as follows: the foaming agent is a combination of sulfobetaine type fluorocarbon surfactant (FS) and α-alkenyl sulfonate (AOS) in a weight ratio of 1:5. The total mass of the system solution is the base number, the concentration of the foaming agent is 0.2wt%; the foam stabilizer is partially hydrolyzed polyacrylamide (HPAM), the molecular weight is 10 million, the degree of hydrolysis is 25%, and the dosage is 1000 mg / L.

[0061] The rest is water.

[0062] The above oil displacement system is abbreviated as: FS:AOS=1:5 (0.2wt%)+HPAM 1000mg / L. The same expressions are also used in the following embodiments, and the meanings are the same as those in this embodiment. This expression is a general expression in the art.

[0063] The above flooding system is used for indoor foam flooding. Crude oil: dehydrated crude oil from Liaohe United Station, viscosity of 950mPa·s at 45°C; viscosity at room temperature: 20...

Embodiment 2

[0065] [Embodiment 2] As described in Embodiment 1, the difference is:

[0066] The oil displacement system FS:AOS=1:5(0.2wt%)+HPAM 500mg / L, the permeability of sand filling pipe k: 360.4md, the water flooding recovery rate is 47.8%, and the enhanced oil recovery rate is 30.9%.

Embodiment 3

[0067] [Embodiment 3] As described in Embodiment 1, the difference is:

[0068] The oil displacement system FS:AOS=1:5(0.1wt%)+HPAM 1000mg / L, the permeability of sand-packing pipe k: 420md, the water flooding recovery rate is 50.5%, and the enhanced oil recovery rate is 29.8%.

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Abstract

The invention relates to a fluorocarbon surfactant binary composite foam flooding system. The system is prepared by adopting fluorocarbon surfactant as a foaming agent, adopting a macromolecular compound as a foam stabilizer and adding water; the foaming agent is one or combination of sulphobetaine type fluorocarbon surfactant and amine oxide type fluorocarbon surfactant, or combination of alpha-alkenyl sulfonate and one of sulphobetaine type fluorocarbon surfactant and amine oxide type fluorocarbon surfactant; and the foam stabilizer is partially hydrolyzed polyacrylamide, polyvinyl pyrrolidone K30, polyvinyl pyrrolidone K90 or hydroxyethyl cellulose. An application method comprises that solution of the fluorocarbon surfactant binary composite foam flooding system and nitrogen are alternately injected into a stratum or a rock center so as to improve the recovery rate of crude oil.

Description

technical field [0001] The invention relates to foam flooding which can be used for improving crude oil recovery, in particular to a fluorocarbon surfactant binary composite foam flooding system, which belongs to the field of oilfield chemistry. Background technique [0002] As oilfield development enters the middle and late stage, the average water flooding recovery factor of developed oilfields in China is only 33%. Tertiary oil recovery technology has become an important method to improve oilfield recovery factor, but whether it is polymer flooding or other chemical flooding Fadu is affected by the heterogeneity of the reservoir, the fluidity in the vertical direction is quite different, and the channeling phenomenon is serious. [0003] To further improve the oil recovery after water flooding, mobility control is the key. [0004] Binary composite foam flooding technology is a new oil displacement method in tertiary oil recovery developed on the basis of conventional fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/594
Inventor 王彦玲蒋官澄郑晶晶马莉徐超金家锋仇东旭王增宝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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