Coal-bed gas multi-branch horizontal-well system

A multi-branch and horizontal well technology, applied in wellbore/well components, production fluid, earthwork drilling and production, etc., can solve problems such as wellbore wall collapse and achieve the effect of ensuring clean, efficient production and improving drainage and production efficiency

Active Publication Date: 2013-03-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a coalbed methane multi-branch horizontal well system to solve the problem of coalbed methane horizontal well main borehole wall collapse, and to establish a stable coalbed methane multi-branch horizontal well development drainage, ash removal, and gas production channel , to provide a stable wellbore environment for drilling construction and post-maintenance operations

Method used

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Examples

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Embodiment 1

[0038] Embodiment 1: A coalbed methane multi-lateral horizontal well system A is further described in detail.

[0039] refer to figure 2 . CBM multi-branch horizontal well system A (the main branch 4 of the multi-branch horizontal well 1 is on the coal seam roof 9). Coalbed methane multi-branch horizontal well system A is located in a sedimentary basin. The coal seam in this basin is 785m deep, 4.0m thick, and 3° in dip. The top of the coal seam is dark gray mudstone, 4° in dip, and 8.0m thick.

[0040] refer to figure 2 , Figure 5 . The coalbed methane multi-branch horizontal well system A is composed of a multi-branch horizontal well 1, a first drainage vertical well 2, and a second drainage vertical well 5. The horizontal section of the multi-branch horizontal well 1 consists of a main branch 4, branches 10 and The vein branch 11 is composed; the first row of mining vertical wells 2 has the first row of mining vertical well caves 3, and the second row of mining vert...

Embodiment 2

[0051] Example 2: Coalbed methane multi-branch horizontal well system B (the main branch 4 of the multi-branch horizontal well 1 is on the coal seam floor 8). Coalbed methane multi-branch horizontal well system B is located in a sedimentary basin, where the coal seam is 785m deep, the coal seam 7 is 4.0m thick, and the coal seam dip is 3°. The bottom of the coal seam is dark gray mudstone, the formation dip is 4°, and the thickness is 8.0m.

[0052] refer to image 3 , Image 6 . The difference from Embodiment 1 is: the main branch 4 of the multi-branch horizontal well 1 of the system B is on the coal seam floor 8 .

[0053] System B is composed of a multi-branch horizontal well 1, a first vertical production well 2 and a second vertical production well 5, and the horizontal section of the multi-branch horizontal well 1 is composed of a main branch 4, branches 10 and vein branches 11; A row of mining vertical wells 2 has the first row of mining vertical wells 3, and the sec...

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Abstract

A coal-bed gas multi-branch horizontal-well system is applied to exploitation of coal-bed gas wells. The coal-bed gas multi-branch horizontal-well system is characterized by being composed of a multi-branch horizontal-well and two discharging and exploring straight wells, wherein the multi-branch horizontal-well is respectively communicated with the two discharging and exploring straight wells, the communication positions are arranged on a stable coal-bed top plate or a base plate, and a main branch drills in from the stable coal-bed top plate or the base plate. The branches are drilled on the main branch and drill into a coal-bed. Range branches are drilled on each branch, and each range branch drills through a dirt band layer in the coal-bed. The coal-bed gas multi-branch horizontal-well system is applicable to a monoclinic coal-bed which is provided with the stable top plate or the base plate. A stable coal-bed gas multi-branch horizontal-well system well washing channel is provided, and water discharging and gas exploitation are separated. The coal-bed gas multi-branch horizontal-well system has the advantages that a main well bore of the coal-bed gas multi-branch horizontal well is stable and capable of being repeatedly entered into, the problem of collapse in the discharging and exploring process can be solved, the stable discharging and exploring channel is supplied through the main branch, discharging and exploring area is controlled through the branches, the coal-bed is dredged through the range branches, and exploring production amount of the coal-bed gas is improved.

Description

technical field [0001] The invention relates to the technical field of coalbed methane, in particular to the field of coalbed methane exploitation, in particular to a coalbed methane multi-branch horizontal well system. Background technique [0002] refer to figure 1 . At present, the multi-branch horizontal well drilling technology for coalbed methane is an important drilling technology to realize the efficient exploitation of coalbed methane. The existing coalbed methane multi-branch horizontal well system is composed of one multi-branch horizontal well 1 and one or two vertical wells 2. well group. A fiberglass casing is added to the coal seam section of the vertical well 2 completion string, which is convenient for later hole milling and cutting of the casing. Cave technology creates caves at the FRP casing in the coal seam section, with a diameter of 0.2-0.6m. The multi-branch horizontal well 1 includes a vertical shaft section, a deflection section, and a horizonta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30
Inventor 杨勇倪元勇崔树清王风锐杨文权李立昌周立春邹志刚
Owner PETROCHINA CO LTD
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