Method for supporting horizontal section wellbore for coal bed gas horizontal well
A technology of horizontal section and horizontal well, which is applied in the field of wellbore support in horizontal section, can solve problems such as wellbore collapse and inability to repair wellbore, and achieve the effect of wellbore recovery and wellbore rehabilitation
Inactive Publication Date: 2011-02-23
BEIJING ORION ENERGY TECH DEV
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Problems solved by technology
However, the problem with this solution is that when the wellbore using this screen collapses, if too many coal or rock particles enter the screen, the wellbore cannot be further repaired.
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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0026] In the actual construction process, in order to solve the problem that the collapse of the horizontal section of the open-hole completed horizontal well will block the wellbore in the downhole accident, the embodiment of the present invention provides a method for supporting the horizontal section of the horizontal section of the coalbed methane horizontal well. Such as figure 1 shown, including steps:
[0027] S11. Drilling and setting up a drainage and pr...
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Abstract
The embodiment of the invention discloses a method for supporting a horizontal section wellbore for a coal bed gas horizontal well, which is characterized by comprising the following steps of: realizing one-time communication of a horizontal well wellbore and a straight well at a remote end and completing the horizontal well wellbore on the premise of controlling the dogleg severity of the track of the horizontal well wellbore to be less than 10 degrees / 30m; and delivering a horizontal section casing along a second section casing, in the process of delivering the horizontal section casing, injecting drilling fluid into the horizontal section casing according to the set distance while delivering the horizontal section casing in the set distance. In the method, by delivering the casing in the horizontal well wellbore, the wellbore is hardly blocked when the wellbore of the horizontal well after well completion collapses, so the wellbore is smooth; besides, the horizontal section casing has a greater pipe diameter, a channel for repairing and cleaning the wellbore is provided in the process of extracting the coal bed gas.
Description
technical field [0001] The invention relates to the field of coalbed methane exploitation, in particular to a method for supporting the wellbore of the horizontal section of a coalbed methane horizontal well. Background technique [0002] CBM multi-branch horizontal wells, horizontal wells, and U-shaped butt-connected wells are generally completed with open holes after drilling, and the drainage and production vertical wells connected to them are used for drainage, pressure reduction and gas production. [0003] However, due to the instability of the geological structure of the coal seam, there may be a collapse accident in the hole completed by the open hole, so that the completed hole will be blocked, resulting in a sharp decline in the production of coalbed methane. [0004] At this time, it is necessary to adopt a technical solution to dredge the collapsed wellbore through engineering transformation to eliminate the impact of the wellbore collapse on the CBM drainage. ,...
Claims
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Login to View More IPC IPC(8): E21B21/00E21B47/022E21B43/30
Inventor 刘利德商昌盛康澜张延峰
Owner BEIJING ORION ENERGY TECH DEV