Parallel multiple main and branch horizontal well system

A horizontal well and horizontal technology, applied in drilling equipment, directional drilling, wellbore/well components, etc., can solve the problems of poor technical economy, high cost, low production, etc., and achieve the effect of overcoming the coal seam's easy collapse

Pending Publication Date: 2019-01-22
哈丁歇尔顿石油工程技术(海南)有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a parallel multi-main-branch horizontal well system to solve the problems of low production, high cost and poor technical economy of coalbed methane development wells in the above-mentioned background technology

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  • Parallel multiple main and branch horizontal well system
  • Parallel multiple main and branch horizontal well system
  • Parallel multiple main and branch horizontal well system

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Embodiment Construction

[0034] The following will describe in detail with reference to the drawings in the embodiments of the present invention.

[0035] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , a parallel multi-branch horizontal well system, characterized in that it includes: an upper straight section 2, which is a longitudinal channel extending vertically downward through the wellhead 1; an orientation section 3, which is an arc channel, and the head end of the directional section 3 communicates with the bottom end of the upper straight section 2, and the tail end of the directional section 3 cuts into the target formation 7 horizontally through the landing point 5; the horizontal extension section is set in the target formation 7 A plurality of main branch channels 4 are formed, and each main branch channel 4 communicates with the tail end of the orientation section 3 through the direction changing channel 6 respectively.

[0036] As a preferred embodiment one...

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Abstract

The invention relates to the field of coal bed gas production, in particular to a parallel multiple main and branch horizontal well system which mainly comprises an upper straight section, an orienteering section and a horizontal extending section. The upper straight section is a vertical channel which vertically extends downwards from a wellhead, the orienteering section is an arc-shaped channel,the front end of the orienteering section is communicated with the bottom end of the upper straight section, the tail end of the orienteering section is horizontally inserted into a target ground from a landing point, the horizontal extending section is formed by a plurality of main and branch channels formed in the target ground, and the main and branch channels are communicated with the tail end of the orienteering section through turning channels and horizontally extend along the directions of the channels.

Description

technical field [0001] The invention relates to the field of coal bed gas exploitation, in particular to a parallel multi-main-branch horizontal well system. Background technique [0002] Existing CBM development methods include: direct development of conventional oil and gas wells, development of clustered or clustered conventional oil and gas wells, development of CBM multi-branched horizontal wells, and CBM hydraulic fracturing wells. [0003] However, the various coalbed methane development wells that have been used up to now have their own characteristics and shortcomings, such as: directly adopting conventional oil and gas wells for development, which has low output, high cost, poor technical economy, and conventional oil and gas wells. The technology is aimed at free high-pressure reservoirs, and cannot be directly applied to low-pressure coalbed methane reservoirs dominated by adsorption; while the development of coalbed methane in clustered or clustered conventional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B43/00E21B43/30
CPCE21B7/046E21B43/006E21B43/305
Inventor 杨锐杨力李思倩
Owner 哈丁歇尔顿石油工程技术(海南)有限公司
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