Method and device capable of improving gas production rate of double-branch U-type well
A gas production, U-shaped technology, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., can solve the problem of not improving the gas production of double U-shaped wells, and achieve the effect of increasing gas production
Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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Problems solved by technology
However, in actual operation, due to geological and drilling and completion reasons, the gas production of double U-shaped wells may be lower than the expected value, and there is currently no method to increase the gas production of double U-shaped wells
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[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0035] It should be noted that the double U-shaped well refers to: drilling two directional horizontal wells from the surface, penetrating the same coal reservoir, and intersecting with a single vertical well at the end of the horizontal section. Vertical wells are gas and water production wells, and screw pumps are generally placed in vertical wells for drainage and pressure reduction. Horizontal wells only provide channels for the gas and water in the reservoir to flow to vertical wells. Horizontal branch wells are generally completed with slotted screens to support...
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The invention discloses a method and device capable of improving a gas production rate of a double-branch U-type well. The method comprises the steps of building a daily gas production rate database of the double U-type well; according to the magnitude of the peak daily gas production rate of the double U-type well, sequentially determining the double U-type well as a first kind of well or a second kind of well or a third kind of well, and analyzing the sudden drop condition of the gas production rate; for the first kind of well or the second kind of well with the gas production rate suddenlydropped, if a horizontal branch adopts a slotted screen for well completion, carrying out well washing on the horizontal branch, and if the horizontal branch does not adopt the slotted screen for wellcompletion, adding and drilling a horizontal branch to be in abut joint with a vertical production well; and for the third kind of well, according to geological conditions, adding and drilling the horizontal branch to be in abut joint with the vertical production well. The gas production rate of the double-branch U-type well can be improved.
Description
technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a method and a device for increasing the gas production of double U-shaped wells. Background technique [0002] Double-branch U-shaped wells are a successful technology for developing medium-rank coalbed methane at present. This technology was successfully tested in the Moranbah gas field in the Bowen Basin of Australia in 2003. The gas production of a single well is as high as 30,000-80,000 cubic meters per day, and the stable production period is 2-3 year. Compared with vertical wells, double-branched U-shaped wells have the characteristics of large coal reservoir contact area, wide control range, and high gas production per well; compared with feathered horizontal wells, they have the characteristics of less drilling risk and can be washed. However, in actual operation, due to geological and drilling and completion reasons, the gas production of double U-shaped wells m...
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IPC IPC(8): E21B43/25E21B37/00E21B7/04
CPCE21B43/25E21B37/00E21B7/046
Inventor 段利江夏朝辉张铭崔泽宏曲良超刘玲莉
Owner PETROCHINA CO LTD