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Super heavy oil reservoir multi-branch SAGD reservoir expansion oil extraction method

A multi-branch and branch technology, applied in the fields of fluid production, earthwork drilling, measurement, etc., can solve the problems of low oil recovery efficiency of super heavy oil, and achieve the effect of solving the low oil production rate and increasing the steam sweep range.

Inactive Publication Date: 2021-06-04
PETROCHINA CO LTD
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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for expansion and recovery of multi-branched SAGD reservoirs in super heavy oil reservoirs, so as to solve the problem of low recovery efficiency of super heavy oil in the prior art

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  • Super heavy oil reservoir multi-branch SAGD reservoir expansion oil extraction method

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Embodiment Construction

[0020] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0022] It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish simila...

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Abstract

The invention provides a super heavy oil reservoir multi-branch SAGD reservoir expansion oil extraction method. The method comprises the following steps that S10, a super heavy oil reservoir area exploited through multi-branch SAGD is selected, and reservoir stratums around wellbores of a branch steam injection horizontal well and a production horizontal well are expanded and transformed; S20, constant-pressure steam injection circulation is conducted on the branch steam injection horizontal well and the production horizontal well at the same time, the steam circulation pressure is larger than the minimum principal stress of rock, and an oil drainage channel is formed between a surrounding expansion zone of the branch part of the branch steam injection horizontal well and a main well hole of the production horizontal well; and S30, micro pressure difference is established between the branch steam injection horizontal well and the production horizontal well, after an oil drainage channel is formed between the surrounding expansion zone of the branch part and the production horizontal well, SAGD production is conducted, and injection and production parameters of the multi-branch SAGD well group are adjusted till production is finished. The oil extraction efficiency is improved by the effect of increasing the oil extraction speed, and the problems that the oil extraction speed of a heterogeneous reservoir is low, and remaining oil above an interlayer is difficult to use are solved.

Description

technical field [0001] The invention relates to the technical field of exploitation of super-heavy oil reservoirs in oil fields, in particular to a method for expanding oil recovery of multi-branched SAGD reservoirs in super-heavy oil reservoirs. Background technique [0002] SAGD technology, that is, steam-assisted gravity drainage technology was invented by Professor Butter of Canada in 1978, and has been successfully applied in heavy oil reservoirs in Canada's oil sands mining area, my country's Liaohe Oilfield, Xinjiang Oilfield and other places. The main principle of dual-horizontal-well SAGD is to deploy two vertically parallel horizontal wells at the bottom of the oil layer, and continuously inject steam from the upper horizontal well into the oil layer to heat the oil layer and crude oil. Viscous crude oil and steam condensate flow down by gravity and are produced from horizontal producing horizontal wells in the lower part of the reservoir. However, under this inje...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B47/06E21B47/07E21B47/00
CPCE21B43/24E21B47/06E21B47/00
Inventor 孙新革罗池辉孟祥兵
Owner PETROCHINA CO LTD
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