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SAGD horizontal well system

A horizontal well, the first flow technology, applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problem that SAGD well cannot realize on-demand steam injection, so as to improve net profit and accurately measure gas injection Effect

Inactive Publication Date: 2016-07-13
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a SAGD horizontal well system to solve the problem of on-demand steam injection in SAGD wells that cannot be realized in the prior art

Method used

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  • SAGD horizontal well system
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Embodiment Construction

[0036] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0037] As introduced in the background section, there is a problem in the prior art that the on-demand steam injection of SAGD wells cannot be achieved. To solve this problem, an exemplary embodiment of the present invention provides a SAGD horizontal well system, such as figure 1 As shown, it includes two horizontal wells, and the two horizontal wells are the upper horizontal well 10 and the lower horizontal well 20, the SAGD horizontal well system also includes a steam control device, and the steam control device includes a steam supply device 41 and a first delivery pipeline 42, One of the upper horizontal well 10 and the lower horizontal well 20 is communicated wit...

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Abstract

The invention provides a SAGD horizontal well system comprising two horizontal wells; the two horizontal wells comprise an upper horizontal well and a lower horizontal well; the SAGD horizontal well system also comprises a steam control device; the steam control device comprises a steam supply unit and a first convey pipe; either the upper or the lower horizontal well is connected with the steam supply unit through the first convey pipe; the first convey pipe is provided with a first flow gauge and a first electric control valve; the upper or lower horizontal well is connected with the steam supply unit through the first convey pipe, so the steam quantity injected in the horizontal well can be controlled; the steam control device can realize accurate steam injection measurement, so too much steam waste can be prevented while ensuring the heat demands of to be mined crude oil, thus further improving production unit net margin.

Description

technical field [0001] The present invention relates to the exploitation of oil reservoir area, in particular, to a SAGD horizontal well system. Background technique [0002] SAGD is currently the most effective technology for the development of ultra-heavy oil in the world. The process is divided into two stages, the start-up stage and the production stage. In the start-up stage, the international common method is to inject steam at the same time in the upper and lower horizontal wells for circulating preheating, heat the oil reservoir around the wellbore through heat conduction, reduce the viscosity, and gradually establish the thermal and hydraulic communication channels between the upper and lower horizontal wells. After the start-up is completed, it will be transferred to the SAGD production stage. In the production stage, the upper horizontal well will continue to inject steam, and the lower horizontal well will continue to produce oil. [0003] SAGD technology has s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 姚玉萍薛兴昌杜文军吴伟栋李强宋佳吴丽萍繆兴冲刘勇张敏
Owner PETROCHINA CO LTD
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