公开(公告)号：US20240287891A1

公开(公告)日：2024-08-29

申请号：US18567322

申请日：2023-01-25

Applicant: Chevron U.S.A. Inc.

Inventor： Thomas Thai Binh Tran ,  Cole Ellis Palmer ,  Alireza Zahedi

IPC: E21B47/06

CPC classification number: E21B47/06 ,  E21B2200/20

Abstract: A method for identifying shut-ins of a well may include obtaining raw pressure values captured over a period of time, where each of the raw pressure values indicates a pressure at a bottom hole of the well; applying filters to the raw pressure values to generate a plurality of filtered pressure values; identifying initial sequences having monotonically trending values among the plurality of filtered pressure values; splicing adjacent initial sequences; adjusting the start point of at least one of the initial sequences based on derivatives of the filtered pressure values; applying a parametric function to the initial sequences to generate fitted sequences; and applying a pattern recognition to the fitted sequences to generate final sequences.

公开(公告)号：US12221876B2

公开(公告)日：2025-02-11

申请号：US18567322

申请日：2023-01-25

Applicant: Chevron U.S.A. Inc.

Inventor： Thomas Thai Binh Tran ,  Cole Ellis Palmer ,  Alireza Zahedi

IPC: E21B47/06

Abstract: A method for identifying shut-ins of a well may include obtaining raw pressure values captured over a period of time, where each of the raw pressure values indicates a pressure at a bottom hole of the well; applying filters to the raw pressure values to generate a plurality of filtered pressure values; identifying initial sequences having monotonically trending values among the plurality of filtered pressure values; splicing adjacent initial sequences; adjusting the start point of at least one of the initial sequences based on derivatives of the filtered pressure values; applying a parametric function to the initial sequences to generate fitted sequences; and applying a pattern recognition to the fitted sequences to generate final sequences.