Coalbed methane (CBM) cluster double multi-branch horizontal well and drilling method relative to discharging and mining vertical well system

A coalbed methane, multi-branch technology, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., can solve the problems of high cost and low drilling efficiency, and achieve the effect of reducing construction period, increasing daily output and reducing cost

Inactive Publication Date: 2015-04-01
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

[0004] In order to deal with the above technical defects, the present invention proposes a coalbed methane cluster type double-layer multi-branch horizontal well an...

Method used

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  • Coalbed methane (CBM) cluster double multi-branch horizontal well and drilling method relative to discharging and mining vertical well system
  • Coalbed methane (CBM) cluster double multi-branch horizontal well and drilling method relative to discharging and mining vertical well system
  • Coalbed methane (CBM) cluster double multi-branch horizontal well and drilling method relative to discharging and mining vertical well system

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Embodiment

[0021] Such as Figure 1-4 As shown, the drilling method of the present invention includes the drilling of four drainage vertical wells in four directions, the completion of eight caves at the reservoir, the drilling of a cluster multi-branch horizontal well, and the long-distance drilling of the corresponding drainage vertical wells. connection; the specific steps are to determine the formation dip angles of the reservoirs in all azimuths around the main wellbore, so as to design the footage direction, footage length, and angle between branches of the horizontal section of the cluster multi-branch horizontal well. In strata, you can choose to use U-shaped horizontal wells instead of multi-branch horizontal wells in the branch direction; in fault block strata, you can choose not to drill or reduce footage, and after determining the position of each row of vertical wells, perform cluster branching in order of azimuth angles construction.

[0022] Drilling and setting vertical ...

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Abstract

The invention relates to a coalbed methane (CBM) cluster double multi-branch horizontal well and a drilling method relative to discharging and mining vertical well system; the method includes: drilling the relative to discharging and mining vertical well according to the cluster wing position differences, finishing drilling the second section of the discharging and mining vertical well, adopting the completion method with lower sleeve at the upper part and naked eye at the lower part, the type of the sleeve is the combination of the steel sleeve and the glass fiber reinforced plastic sleeve; adopting the hole building mode for building the hole at the naked eye section by spraying, cutting the sleeved at the section with glass fiber reinforced plastic sleeve for forming the hole; adopting the building type deflecting mode for connecting the main well hole and the discharging and mining well hole in a long distance, drilling the horizontal branch section after finishing connecting; fixing and sealing the pocket of the discharging and mining well, washing the well, fixing and sealing the deflecting section, the branch wing can be used for production; finishing the other wings by the same process. The single well sweep area and the daily output are raised by the method, the construction cost is reduced, the security coefficient is increased and the construction period is shortened.

Description

technical field [0001] The invention relates to the field of coalbed methane development, in particular to a drilling method for a coalbed methane cluster type double-layer multi-branch horizontal well and a corresponding drainage and production vertical well system. Background technique [0002] At present, two types of wells, vertical well and horizontal well, are generally used in the exploitation of coalbed methane. The horizontal well has received more and more attention and application because of its large sweep area and large output. The method of producing CBM by horizontal well generally adopts the drilling plan that the main wellbore is connected with a completed drainage and production vertical well through the deflection section, and then the horizontal section is drilled, and finally put into production through the drainage and production vertical well; For the connection of vertical wells, it is necessary to carry out reaming pretreatment on the drainage and pr...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B7/04E21B43/00
CPCE21B43/305E21B7/04E21B7/046E21B43/006
Inventor 潘一冷俊杨双春
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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