公开(公告)号：US10731451B2

公开(公告)日：2020-08-04

申请号：US16284594

申请日：2019-02-25

Applicant: PetroChina Company Limited

Inventor： Yonggui Mei ,  Quanjiang Zhang ,  Biyun Zhu ,  Xianzhi Wang ,  Jian Guo ,  Wuchang Zhang ,  Xiaohua Lian ,  Shengfa Mao ,  Zhanxin Xue ,  Liuping Deng

IPC: E21B43/30 ,  E21B43/00 ,  E21B49/00 ,  E21B43/26 ,  E21B21/00 ,  E21B7/04

Abstract: An exploitation method and an exploitation well pattern for coalbed methane in a low-permeability coalbed. The method comprises: determining a maximum principal stress direction in a low-permeability coalbed; disposing at least two large-roadway horizontal wells in the low-permeability coalbed; disposing a plurality of production wells on two sides of a horizontal segment of each of the at least two large-roadway horizontal wells, wherein a diameter of each of the production wells is smaller than a diameter of the horizontal segment; exploiting the coalbed methane in the low-permeability coalbed through the at least two large-roadway horizontal wells and the plurality of production wells. Through the horizontal segments of the large-roadway horizontal wells perpendicular to the maximum principal stress direction, it promotes stress release in low-permeability coalbed to form more fracture channels, thereby improving the exploitation efficiency of the coalbed methane in the low-permeability coalbed.

公开(公告)号：US20190186252A1

公开(公告)日：2019-06-20

申请号：US16284594

申请日：2019-02-25

Applicant: PetroChina Company Limited

Inventor： Yonggui Mei ,  Quanjiang Zhang ,  Biyun Zhu ,  Xianzhi Wang ,  Jian Guo ,  Wuchang Zhang ,  Xiaohua Lian ,  Shengfa Mao ,  Zhanxin Xue ,  Liuping Deng

IPC: E21B43/30 ,  E21B43/00

Abstract: The present disclosure discloses an exploitation method and an exploitation well pattern for coalbed methane in a low-permeability coalbed. The method comprises: determining a maximum principal stress direction in a low-permeability coalbed (1); disposing at least two large-roadway horizontal wells (3) in the low-permeability coalbed (1); disposing a plurality of production wells (4) on two sides of a horizontal segment (31) of each of the at least two large-roadway horizontal wells (3), wherein a diameter of each of the production wells (4) is smaller than a diameter of the horizontal segment (31) of the large-roadway horizontal well (3); exploiting the coalbed methane in the low-permeability coalbed through the at least two large-roadway horizontal wells (3) and the plurality of production wells (4). Through the horizontal segments (31) of the large-roadway horizontal wells (3) perpendicular to the maximum principal stress direction, the present disclosure promotes the stress release in low-permeability coalbed forms more fracture channels, thereby achieving the exploitation of the coalbed methane through the at least two large-roadway horizontal wells and the plurality of production wells, and improving the exploitation efficiency of the coalbed methane in the low-permeability coalbed.