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A system and method for staged fracturing of a coalbed methane well

A technology for coalbed methane well and staged fracturing, which is applied in the field of coalbed methane well fracturing, can solve the problems of complex process, high construction risk and high construction cost, and achieves the effects of reducing cost, shortening construction period and avoiding well workover.

Active Publication Date: 2015-12-09
CHINA UNITED COALBED METHANE NAT ENGRES CENT +1
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Problems solved by technology

[0006] The invention provides a system and method for staged fracturing of coalbed methane wells to solve the problems of high construction risk, complicated process and high construction cost

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  • A system and method for staged fracturing of a coalbed methane well
  • A system and method for staged fracturing of a coalbed methane well
  • A system and method for staged fracturing of a coalbed methane well

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] see figure 1 , is a structural diagram of a staged fracturing system for a coalbed methane horizontal well in an embodiment.

[0040] The system includes: a casing sub 200, a fracturing device, a ball launcher 100, and a packing ball. In order to make the structure diagram concise and easy to explain, in figure 1 The fracturing device and packing ball are not shown. Wherein, the fracturing device is a commonly used device in the field. In this embodiment, it can be any device for fracturing the coal seam with fracturing fluid, and there is no special limitation here.

[0041] In this embodiment, there are six casing nipples 200, namely, the first-level casing nipple 200a, the second-level casing nipple 200b, the third-level c...

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Abstract

The invention discloses a staged fracturing system and a staged fracturing method of a coal-bed gas well. The system comprises sleeve short sections, a fracturing device, a ball injector and a packer ball. Each sleeve short section is connected with a production sleeve of the coal-bed gas well and disposed between two fracturing sections. The production sleeve with the sleeve short sections is placed down into the well for fixing the well after drilling. The ball injector is connected with the upper portion of a Christmas tree in the coal-bed gas well. The inner diameters of the sleeve short sections decreases sequentially according to the distance, from near to far, between the sleeve short sections and the ball injector. The fracturing device sequentially fractures the fracturing sections according to the distance, from far to near, between the fracturing sections and the ball injector, when fracturing of one fracturing section is completed and perforation of the next fracturing section is completed, fracturing liquid is filled, a packer ball injected by the ball injector is delivered to sleeve short section, close to one side of the ball injector, of the fracturing section whose fracturing is completed to seal the sleeve short section, and the packer ball is matched with the sleeve short sections. By the system and the method, construction period is shortened, and cost is lowered.

Description

technical field [0001] The invention relates to the field of fracturing of coalbed gas wells, in particular to a system and method for staged fracturing of coalbed gas wells. Background technique [0002] Coalbed methane reservoirs are characterized by low porosity and low permeability, and generally require fracturing to obtain better gas production. Among them, coalbed methane mining can use various development methods such as coalbed methane vertical wells, coalbed methane directional wells, and coalbed methane horizontal wells. [0003] In the existing technology, the drilling and completion technology of coalbed methane horizontal wells completed with casing is basically mature. If there is a mature fracturing stimulation technology matching it, the method of casing completion and fracturing can greatly promote CBM development, but there are still some technical problems in its staged fracturing. Among them, fracturing is a commonly used stimulation method for convent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
Inventor 彭少涛李曙光刘富孙斌刘川庆
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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