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

A treatment agent, a technology for oil wells, applied in drilling compositions, wellbore/well components, production fluids, etc., can solve problems such as no correlation, reduce interfacial tension, improve construction effects, and have strong foaming ability. Effect

Active Publication Date: 2013-06-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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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] In a heavy oil well, the oil layer is 20 meters thick and has 4 layers. The viscosity of crude oil is 6570mPa.s. Due to repeated throughput, the effect becomes worse round by round.

[0038] During construction, first squeeze in auxiliary agent: 60 tons of mixed solution of commercially available NP-15 (nonylphenol polyoxyethylene ether) 10% wt% and commercially available AES (fatty alcohol polyoxyethylene ether sodium sulfate) 15% wt% , isolate 10 tons of 10%wt% additives (2%wt% ammonium chloride, 1%wt% sodium nitrite, and the rest are water) in the middle, and then squeeze 10 tons of additives by steam injection points along with the steam, and the amount of steam 3000 square meters. Stew well for 3 days. After the well was opened, compared with the same period, the daily increase of oil was 4 tons, and the daily increase of liquid was 13 cubic meters, with obvious effect.

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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 a combined oil well treatment agent for viscosity reduction, profile control and oil displacement and its application. Background technique [0002] There are many methods used in oilfields for viscosity reduction, profile control and oil displacement in steam huff and puff wells. However, due to the influence of high temperature and high pressure, the choices of viscosity reducer, profile control agent and oil displacement agent are limited. There have been many attempts over the years to figure out how to get the most out of limited resources. [0003] "Study on the Technology of Improving the Development Effect in the Late Stage of Multi-round Huff and Puff of Heavy Oil Reservoirs" Doctoral Dissertation of China University of Petroleum in 2007, Li Jinfa. "Research and Application of New Foam Control and Displacement System in Thermal Recovery Wells" 2011 Master's Thesis of China University of Petroleum, Zhang Yong. A larg...

Claims

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Application Information

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Patent Type & Authority Applications(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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