Fluorocarbon surfactant binary composite foam flooding system

A fluorocarbon surface, binary composite technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of insufficient application of foam flooding, inability to withstand high temperature and high salt, poor oil resistance, etc. Stable, strong oil resistance, excellent water repellent effect

Active Publication Date: 2013-05-29
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 to drive oil The total mass of the system solution is used as the base, and the foaming agent concentration is 0.2wt%. The foam stabilizer is partially hydrolyzed polyacrylamide (HPAM), with a molecular weight of 10 million, a degree of hydrolysis of 25%, and a dosage of 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 common expression in the art.

[0063] Indoor foam flooding for the above oil displacement system, crude oil: dehydrated crude oil of Liaohe Union Station, viscosity at 45°C is 950mPa·s; viscosity at room temperatur...

Embodiment 2

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

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

Embodiment 3

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

[0068] The oil displacement system FS:AOS=1:5(0.1wt%)+HPAM 1000mg / L, the permeability k of the sand packing pipe: 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 that can be used to enhance crude oil recovery, in particular to a fluorocarbon surfactant binary composite foam flooding system, and belongs to the field of oil field chemistry. Background technique [0002] As oilfield development enters the middle and later stages, the average water flooding recovery rate of China's developed oilfields is only 33%, and tertiary oil recovery technology has become an important method to improve oilfield recovery rate, but whether it is polymer flooding or other chemical agent flooding All methods are affected by the heterogeneity of the reservoir, the vertical mobility difference is large, and the channeling phenomenon is serious. It is impossible for the chemical agent to fully reach the part where the remaining oil is enriched, and the crude oil cannot be fully washed. [0003] To further enhance oil recovery after waterflooding, mobility control is the key. [0004] Binary co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594
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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