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Horizontal well profile control method and device

A horizontal well and horizontal section technology, applied in the field of horizontal well profile control methods and devices, can solve the problems of weak plugging effect, difficulty in exerting profile control effect, failure, etc., and achieve the effect of improving temperature resistance

Inactive Publication Date: 2018-11-06
PETROCHINA CO LTD
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Problems solved by technology

The above-mentioned profile control methods are effective for low-to-medium-period ultra-heavy oil horizontal wells, but with the intensification of production unevenness and the formation of steam channeling channels, the effect gradually becomes worse
Specifically, the profile control strength of nitrogen foam and nitrogen foam gel is relatively low, and they have a weak plugging effect on ultra-heavy oil horizontal wells with medium and high period huff and puff, and they will quickly fail under the flushing of subsequent steam injection, making it difficult to exert an ideal profile control effect

Method used

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Embodiment Construction

[0038] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application.

[0040] It should be noted that when an element is referred to as being “d...

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Abstract

The invention discloses a horizontal well profile control method and device. A horizontal well comprises a vertical well section and a horizontal section, wherein the vertical well section is internally provided with a casing and an oil pipe, and an oil jacket annular space is formed between the casing and the oil pipe. The horizontal section is located in an oil layer and is completed by a screenpipe. The method comprises the steps that a predetermined amount of nitrogen foam gel plugging agent is injected into the horizontal well; construction pressure is acquired, and when the constructionpressure reaches a predetermined range, the gel plugging agent with the temperature resistance higher than that at a maximum temperature of injected steam is injected into the horizontal well; a displacement slug is injected into the horizontal well, and the plugging agent in the vertical well section is replaced into an oil layer communicating with the horizontal section. The horizontal well profile control method and device can perform profile control of a super heavy oil horizontal well of high and medium cycle throughput, and reduces the degree of inconsistency of use and reduces the formation of steam channeling channels as much as possible.

Description

technical field [0001] The invention relates to the technical field of profile control and flood control, in particular to a horizontal well profile control method and device. Background technique [0002] At present, as the scale of deployment of horizontal wells increases, the contribution rate to the stable production of Shuguang Oilfield is also increasing. However, with the deepening of horizontal well development, the uneven production of horizontal sections has gradually become prominent, which seriously limits the productivity of horizontal wells. Statistics show that the high producing section of a horizontal well only accounts for 39% of the length of the horizontal section. Taking horizontal wells in Du 84 Xinglongtai block as an example, the well-produced horizontal section accounts for only 26% of the total well section. Uneven production leads to local burst of injected steam, which seriously affects the development effect of horizontal wells, and may even lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 刘江玲杨洋朱铁民娄帅黄小雷李晓光
Owner PETROCHINA CO LTD
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