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Efficient compound anti-swelling oil displacement agent and method for preparing same

An oil-displacing agent and high-efficiency technology, applied in the field of high-efficiency composite anti-swelling oil-displacing agent and its preparation, can solve the problems of not paying attention to the geological characteristics of the oil reservoir and the physical properties of the crude oil, and not considering the expansion of the rock formation, etc., so as to improve the oil washing efficiency , good calcium soap dispersibility, improve the effect of sweep coefficient

Inactive Publication Date: 2011-06-15
大庆浩拓化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing oil displacement agents only pursue ultra-low interfacial tension, do not pay attention to the geological characteristics of the reservoir and the physical properties of crude oil, and do not consider the expansion of rock formations.

Method used

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  • Efficient compound anti-swelling oil displacement agent and method for preparing same
  • Efficient compound anti-swelling oil displacement agent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] At normal temperature and pressure, to the 2m with condenser 3 Add 800kg of polyacrylamide and 400kg of dichloroethane into the stainless steel reactor, start stirring, react at 90°C for 15 hours, control at 0.6MPa, add 300kg of sodium octylbenzenesulfonate, 200kg of potassium alginate and 100kg of NaOH, and react for 10 hours , pass condensed water, cool down to 30°C, add 300kg of KCl, and continue to stir for 1 hour to obtain 2 tons of the product, which is stored and packaged.

Embodiment 2

[0046] At normal temperature and pressure, to the 2m with condenser 3 Add 882kg of polyacrylamide and 441kg of dichloroethane into the stainless steel reaction kettle, start stirring, react at 80°C for 14 hours, control at 0.6MPa, add 252kg of sodium octylbenzenesulfonate, 168kg of potassium alginate and 63kg of NaOH, and react for 8 hours , pass condensed water, cool down to 15°C, add 294kg of KCl, and continue stirring for 1 hour to obtain 2 tons of product, which are stored and packaged.

Embodiment 3

[0048] At normal temperature and pressure, to the 2m with condenser 3Add 800kg of polyacrylamide and 400kg of dichloroethane into the stainless steel reaction kettle, start stirring, react at 90°C for 12 hours, control at 0.5MPa, add 300kg of sodium octylbenzenesulfonate, 200kg of potassium alginate and 100kg of NaOH, and react 6 hour, pass condensed water, cool down to 30°C, add 300kg of KCl, and continue stirring for 0.5 hour to obtain 2 tons of product, which is stored and packaged.

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Abstract

The invention provides an efficient compound anti-swelling oil displacement agent, which is prepared from following raw materials in percentage by weight: 30 to 50 percent of polyacrylamide, 15 to 30 percent of dichloroethane, 10 to 15 percent of sodium octylbenzenesulfonate, 5 to 20 percent of potassium alginate, 1 to 5 percent of NaOH and 5 to 15 percent of KCl. The oil displacement agent of the invention has rich raw material sources, less energy consumption, low cost, high oil displacement efficiency and comprehensive mechanization, and has double effects of inhibiting clay swelling and improving displacement efficiency. In the oil displacement by using the 0.8 percent oil displacement agent of the invention, the recovery ratio of crude oil can be improved by 15 to 25 percent, and continuous injection-production of a water injection well can be ensured. The efficient compound anti-swelling oil displacement agent has the advantages of low Kraff point, high lime soap dispersing performance and wetting ability, capacity of emulsifying the crude oil and high adaptability. The invention also provides a method for preparing the oil displacement agent.

Description

technical field [0001] The invention relates to an anti-swelling oil-displacing agent in the oil exploitation industry, in particular to a high-efficiency composite anti-swelling oil-displacing agent used in water injection exploitation and tertiary oil recovery of strong water-sensitive layers and a preparation method thereof. Background technique [0002] With the rapid development of the economy, China's demand for crude oil is increasing. Net imports account for about 30% of the total consumption. Crude oil has become an important factor restricting China's economic development. In order to reduce the impact of international crude oil prices on China's economic development and maintain sustained economic growth, it has become China's top priority to adopt new technologies, improve the recovery rate of crude oil in existing oil fields, and increase crude oil production. [0003] At present, in the petroleum industry, primary oil recovery is a process in which crude oil is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/588
Inventor 朱大雷
Owner 大庆浩拓化工有限公司