Special Oil & Gas Reservoirs >

2020 , Vol. 27 >Issue 4: 168 - 174

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.04.026

Drilling & Production Engineering

Shale Gas Wellbore Liquid Loading Identification Based on Triangle Plate

  • Luo Xin ,
  • Wang Yuting ,
  • Wang Xueqiang ,
  • Zhao Guojun ,
  • Chen Man ,
  • Zeng Linjuan ,
  • Yang Hai ,
  • Yan Changhui
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  • 1. Sichuan Changning Natural Gas Development Co., Ltd., Chengdu, Sichuan 610056, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu, Sichuan 610059, China;
    3. Sichuan Shengnuo Oil and Gas Engineering Service Co., Ltd., Deyang, Sichuan 618300, China;
    4. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China

Received date: 2019-11-03

  Revised date: 2020-04-21

  Online published: 2022-02-18

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Abstract

In order to improve the productivity decline, insufficient liquid-carrying capacity, serious wellbore liquid loading, low recovery and other problems in the middle-late stage for the most gas wells in the Wellblock CN201 of shale gas field in Sichuan Basin, the actual production data were normalized and extremalized to eliminate the influence of parameter unit and magnitude order by comprehensively considering wellbore pressure, daily gas production and water-gas ratio according to the production performances. A triangle plate was given to analyze the scattered point distribution and determine the wellbore liquid loading area. Result indicates that the shale gas wellbore liquid loading zones for the Wellblock CN201 includes the wellhead pressure proportion is 42.38%～76.39%, the daily gas production proportion is 0.0～51.5% and the water-gas ratio proportion is 0.0～52.7%. Flowing pressure test indicates a accuracy of 84.3% for this triangle plate, which is highly reliable to identify shale gas wellbore liquid loading. This research could provide certain theoretical reference for determining on-site liquid discharge timing, liquid discharge process and liquid discharge performance evaluation.

Key words： shale gas; wellbore liquid loading; triangle plate; wellhead pressure; daily gas production; water-gas ratio; identification method

Cite this article

Luo Xin , Wang Yuting , Wang Xueqiang , Zhao Guojun , Chen Man , Zeng Linjuan , Yang Hai , Yan Changhui . Shale Gas Wellbore Liquid Loading Identification Based on Triangle Plate[J]. Special Oil & Gas Reservoirs, 2020 , 27(4) : 168 -174 . DOI: 10.3969/j.issn.1006-6535.2020.04.026

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