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Oil well combined treating agent for viscosity reduction, profile control and oil displacement and application thereof

A treatment agent, technology for oil wells, applied in drilling compositions, wellbore/well components, production fluids, etc., can solve problems such as no correlation, and achieve the advantages of reducing interfacial tension, strong foaming ability, and improving construction effect. Effect

Active Publication Date: 2015-05-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] Currently popular domestic construction methods and chemical agent combinations are not relevant to the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A heavy oil well, the thickness of the oil layer is 20 meters, 4 layers. The viscosity of crude oil is 6570mPa.s, and the effect becomes worse after repeated throughput.

[0038] During construction, first squeeze in auxiliary agents: 60 tons of a mixed solution of 10% wt% of commercially available NP-15 (nonyl phenol polyoxyethylene ether) and 15% wt% of commercially available AES (fatty alcohol polyoxyethylene ether sulfate) 15% by weight , Isolate 10 tons of 10%wt% additives in the middle (ammonium chloride 2%wt%, sodium nitrite 1%wt%, the rest is water), and then squeeze 10 tons of auxiliary agents into the steam from the steam injection point. The amount of steam 3000 squares. Stew well for 3 days. After the well was opened, compared with the same period, the daily increase in oil was 4 tons and the daily increase in fluid was 13 cubic meters, which showed obvious results.

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PUM

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Abstract

The invention relates to an oil well combined treating agent for viscosity reduction, profile control and oil displacement and application of the oil well combined treating agent. The oil well combined treating agent comprises an auxiliary agent and an assistant agent, wherein the auxiliary agent comprises, by weight, 1% to 2% of ammonium chloride, 1% to 2% of sodium nitrite, and the balance water in a preparation mode. The assistant agent comprises, by weight, 5% to 10% of nonyl phenol polyoxyethylene ether and / or 10% to 15% of fatty alcohol-polyoxyethylene ether sodium sulfate, and the balance water. According to the oil well combined treating agent for the viscosity reduction, the profile control and the oil displacement, interfacial tension can be effectively reduced, foaming capacity is strong, and the aims of the viscosity reduction, the profile control and the oil displacement are achieved.

Description

Technical field [0001] The invention relates to an oil well combination treatment agent for viscosity reduction, profile control and oil displacement and its application. Background technique [0002] There are many methods used in steam stimulation wells for viscosity reduction, profile control, and oil displacement. However, due to the influence of high temperature and high pressure, the choices of viscosity reducers, profile control agents, and oil-displacing agents are limited. Many attempts have been made over the years to maximize the benefits of using limited resources. [0003] "Technical Research on Improving the Development Effect of Heavy Oil Reservoir after Multiple Rounds of Huff and Puff" 2007 PhD thesis of China University of Petroleum, Li Jinfa. "Research and Application of New Foam Profile Control and Displacement System in Thermal Recovery Wells" 2011, China University of Petroleum, Master's thesis, Zhang Yong. A lot of experiments have been done on viscosity r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/592C09K8/42E21B43/22E21B33/13E21B43/24
Inventor 高玉军周洪义肖伟杨喜良曹纪绒乌丽娟孙海波何中锋高航王明国
Owner PETROCHINA CO LTD
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