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Method and device for improving gas production of double U-shaped well

A gas production, U-shaped technology, applied in drilling equipment and methods, directional drilling, drilling equipment and other directions, can solve the problem of not increasing the gas production of double U-shaped wells, and achieve the effect of increasing gas production

Active Publication Date: 2022-06-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method and device for improving gas production of double U-shaped well
  • Method and device for improving gas production of double U-shaped well
  • Method and device for improving gas production of double U-shaped well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] Step 101, establish the daily gas production database of the double U-shaped well.

[0040] Step 104, for the third type of well, according to the geological conditions, drilling horizontal branch and vertical production well docking.

[0045] The daily gas production database refers to the daily gas production data after the double U-shaped wells are put into production.

[0049] Before analyzing the peak daily gas production of the double U-shaped wells, the quality control of the data should be carried out. This is because of gas production

[0055] For the first type well and the second type well with a sudden drop in gas production, if its horizontal branch does not take slotted screen completion,

[0067] Using the high and low thresholds to determine a first type of well, a second type of well or a third type of well.

[0068] Among them, the "preset proportion of wells" is about 25%, 50%, and 25%.

[0080] The embodiment of the present invention also provides a comp...

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Abstract

The invention discloses a method and device for improving the gas production of double U-shaped wells. The method includes: establishing a daily gas production database of double U-shaped wells; The type wells are determined as the first type well, the second type well or the third type well in sequence, and the sudden drop in gas production is analyzed; If slotted screens are used to complete the well, the horizontal branch will be flushed. If the horizontal branch is not completed with slotted screens, the horizontal branch will be drilled to connect with the vertical production well; for the third type of well, according to geological conditions, Drilling horizontal branch and vertical production well docking. The invention can improve the gas production of double U-shaped wells.

Description

Method and device for increasing gas production of double U-shaped wells technical field The present invention relates to oil and gas exploitation field, relate in particular to a kind of method and device that improves gas production of double-branched U-shaped wells. Background technique [0002] The double-branched U-shaped well is a successful technology for developing medium-rank coalbed methane. The technology was introduced in Australia in 2003. The Moranbah gas field in the Bowen Basin was successfully tested, with a single well gas production of 3-80,000 cubic meters per day and a stable production period of 2-3 years. Double U shape Compared with vertical wells, wells have the characteristics of large coal reservoir contact area, wide control range, and high gas production per well; In contrast, it has the characteristics of less drilling risk and well flushing. However, in practice, due to the geological and Therefore, the gas production of the double U-sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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