Method for Improving Steam Equalization in Steam Flooding Oil Recovery Process and Steam Flooding Oil Recovery System

Abstract

The invention provides a method for enhancing steam balance in steam-drive oil exploitation and a steam-drive oil exploitation system. The method comprises the steps that when straight well-horizontal well steam drive is adopted in the steam-drive oil exploitation, a first oil exploitation horizontal well and multiple first steam injection straight well pairs are used for the oil exploitation, and first steam injection straight wells in the first steam injection straight wells conduct steam injections asynchronously; and when dual-horizontal well steam drive and / or stereoscopic dual-horizontal well steam drive are / is used in the steam-drive oil exploitation, a first steam injection horizontal well and a second oil exploitation horizontal well are used for the oil exploitation, wherein the first steam injection horizontal well comprises a steam injection main pipe and a steam injection auxiliary pipe which are arranged in parallel, the steam injection main pipe comprises a first steam injection point, the steam injection auxiliary pipe comprises a second steam injection point, and the location of the second steam injection point at the steam injection auxiliary pipe is moved at intervals of a set cycle, so that second steam injection can be remote from the first steam injection point. The method has the advantages that balance of steam injected during the steam-drive oil exploitation and a producing ratio of an oil layer can be increased; and finally, oil recovery efficiency can be increased.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for improving steam balance in the steam flooding oil recovery process and a steam flooding oil recovery system. Background technique [0002] At present, the relatively mature mining technology for heavy oil and super heavy oil in my country is steam injection thermal recovery. The usual steam injection thermal recovery method is steam huff and puff. However, after a certain period of steam huff and puff for heavy oil to form thermal communication, only the crude oil in the oil layer near each well point can be recovered, leaving a large number of dead oil areas between the wells. , the general recovery rate is only 10% to 25%. [0003] In order to improve the overall effect of steam injection thermal recovery and the oil recovery rate, it is necessary to turn steam stimulation production into steam flooding production at an appropriate time. Steam flood...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for improving steam balance in the process of steam flooding oil production and a steam flooding oil recovery system to solve the problem that the steam chamber formed in the steam flooding oil recovery in the prior art cannot be expanded in a balanced manner, which affects the overall steam injection thermal recovery. Effects and problems of oil recovery

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