公开(公告)号：US11008837B2

公开(公告)日：2021-05-18

申请号：US15947968

申请日：2018-04-09

Applicant: Korea Gas Corporation

Inventor： Kihong Kim ,  Jeong-Min Han ,  Youngseok So ,  Il oh Kang ,  Junwoo Seo

IPC: E21B43/00 ,  G06F30/23 ,  G06F111/10 ,  G01V11/00 ,  E21B49/02

Abstract: A method for modeling gas production in a coalbed methane gas (CBM) reservoir including (a) dividing a reservoir in a CBM development area into three-dimensional grids to form the three-dimensional grids having a plurality of cells; (b) forming at least one drilling hole in the development area and obtaining a sample for each depth in the reservoir; (c) modeling the amounts of ash, water, and gas for the plurality of cells in the three-dimensional grids; (d) modeling a pressure change over time in each of the cells in the grid under a premise in which a production well is formed in the grids; and (e) performing a Langmuir experiment for a core sample obtained from step (b).

公开(公告)号：US20180306009A1

公开(公告)日：2018-10-25

申请号：US15947968

申请日：2018-04-09

Applicant: Korea Gas Corporation

Inventor： Kihong Kim ,  Jeong-Min Han ,  Youngseok So ,  Il oh Kang ,  Junwoo Seo

IPC: E21B43/00 ,  G06F17/50 ,  E21B49/02 ,  E21B43/25

CPC classification number: E21B43/006 ,  E21B43/255 ,  E21B49/025 ,  G06F17/5018

Abstract: The present invention includes (a) dividing the reservoir in a coalbed methane (CBM) development area through computer modeling and thereby forming a three-dimensional grids having a plurality of cell, (b) actually forming drilling holes in the development area and thereby obtaining core samples for each depth, (c) modeling the amounts of ash, water, and gas in each of the cells, (d) modeling the pressure change over time in each of the cells under a premise in which a production well is formed in the grids, and (e) performing a Langmuir experiment for the core samples, determining a Langmuir function for a maximum amount of gas adsorption with pressure and amounts of ash and water as variables, and applying the Langmuir function to each of the cells to calculate an amount of gas detected due to pressure change over time.