Efficient composite viscosity reduction agent for viscous oil recovery

A viscosity-reducing agent and high-efficiency technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult control of emulsion stability, poor biochemical degradation performance, large amount of water, etc., to increase post-treatment of crude oil Stable pressure, stable performance, improved obvious effect

Inactive Publication Date: 2018-11-23
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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Problems solved by technology

However, most of the emulsified viscosity reducers currently developed also have problems such as 1) large amount of water added; 2) difficulty in controlling the stability of the emulsion; 3) corrosion problems; 4) difficult follow-up processing; 5) poor biochemical degradation performance, etc.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0015] 1. According to the mass ratio, it is 10% sodium dodecyl sulfate, 5% sodium dodecylbenzenesulfonate, 13% alkylphenol polyoxyethylene ether, 15% polyacrylate, and 57% water. The several kinds of raw materials are mixed and stirred to obtain a high-efficiency composite viscosity reducer for heavy oil recovery. Using Shengli Oilfield as a viscosity reduction test for heavy oil, the viscosity reduction rate reached 98%.

[0016] 2. According to the mass ratio, it is 15% of sodium dodecyl sulfate, 10% of sodium dodecylbenzenesulfonate, 15% of alkylphenol polyoxyethylene ether, 30% of polyacrylate, and 30% of water. The several raw materials are mixed and stirred to obtain a multi-effect viscosity reducer for heavy oil recovery. Viscosity reduction test for heavy oil in Karamay Oilfield, the viscosity reduction rate reached 98%.

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Abstract

The invention relates to the technical field of oil production, and particularly relates to an efficient composite viscosity reduction agent suitable for viscous oil reservoir recovery. The compositeviscosity reduction agent is prepared from the following raw materials in percentage by mass: 10 to 15% of sodium lauryl sulfate, 5 to 10% of sodium dodecylbenzene sulfonate, 13 to 15% of alkylphenolethoxylate, 15 to 30% of polyacrylate and the balance of water. The alkylphenol ethoxylate is a condensation compound of alkylphenol and ethylene oxide. The polyacrylate is a segmented copolymer of ethyl acrylate and butyl acrylate, which has a molecular weight of 50 to 300 thousand. The efficient composite viscosity reduction agent disclosed by the invention is high in viscosity reduction rate; the viscous oil viscosity reduction rate can reach 98% in a range of 30 to 70 DEG C; the efficient composite viscosity reduction agent can be widely applied to viscous oil recovery.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a high-efficiency composite viscosity reducer suitable for the exploitation of heavy oil reservoirs. Background technique [0002] Heavy oil refers to crude oil with high viscosity, which mostly contains heavy and long-chain hydrocarbon components such as colloid, wax and asphaltenes. Colloids are mainly carbon-heterocyclic structures containing heteroatoms, and the super-strong cross-linking and winding effect formed by π-π interaction and electrostatic attraction between them leads to high viscosity of crude oil; asphaltenes are mainly composed of polyphenyl rings conjugated The formed macromolecular structure has a molecular weight of about 700-1000. Due to the high viscosity of heavy oil, poor flow capacity, large flow pressure difference, and low mobility in underground reservoirs, it often leads to rapid formation energy decay and low recovery degree during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 王敏
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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