Special Oil & Gas Reservoirs >

2020 , Vol. 27 >Issue 5: 139 - 144

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.05.021

Drilling & Production Engineering

Development and Field Test of GW-CP194-80M CBM Dual Pressure Coring Tool

  • Zhu Qingzhong ,
  • Su Xuefeng ,
  • Yang Liwen ,
  • Su Yang ,
  • Luo Jun
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  • 1. PetroChina Huabei Oilfield Company,Renqiu, Hebei 062552, China;
    2. CNPC Greatwall Drilling Company,Panjin, Liaoning 124010, China

Received date: 2019-08-26

  Revised date: 2020-04-20

  Online published: 2022-02-18

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Abstract

During the CBM coring process, there is a great variation for the gas content and permeability due to pressure release and sampling operation, which will distort the corresponding test data and seriously influence the formulation of CBM development program. the GW-CP194-80M CBM dual-pressure coring tool was developed to obtain the original core sample under overburden pressure and reduce the test error caused from the formation condition variation. Gas-liquid pressure compensation and a compound rubber pressure-holding cylinder were used to hold the original formation pressure and proper confining pressure to prevent the creation of micro fractures. The sample can be directly used to permeability, critical desorption pressure and other subsequent tests through disassembly under pressure eon the ground. Laboratory field tests indicates that the GW-CP194-80M CBM dual-pressure coring tool is characterized by reliable performance, technical feasibility, effective maintenance of sample structure and favorable dual-pressure performance. This coring tool could provide certain technical reference for the reasonable formulation of CBM development program and accurately determine reserves.

Key words： coring tool; CBM; formation pressure; confining pressure; dual-pressure coring

Cite this article

Zhu Qingzhong , Su Xuefeng , Yang Liwen , Su Yang , Luo Jun . Development and Field Test of GW-CP194-80M CBM Dual Pressure Coring Tool[J]. Special Oil & Gas Reservoirs, 2020 , 27(5) : 139 -144 . DOI: 10.3969/j.issn.1006-6535.2020.05.021

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