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Natural Gas Exploration and Development >

2023 , Vol. 46 >Issue 3: 140 - 145

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2023.03.017

UNCONVENTIONAL OIL AND GAS

Coring technologies for complex reservoirs of Longwangmiao Formation with high-angle fractures

  • WANG Jun ,
  • DUAN Xulin ,
  • YU Xingying ,
  • HUANG Yubo ,
  • WU Yunkai ,
  • LI Yu ,
  • LEI Liou
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  • 1. Chuandong Drilling Company, CNPC Chuanqing Drilling Engineering Company Limited, Chongqing 401120, China;
    2. Well Testing and Workover Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610083, China

Revised date: 2023-06-15

  Online published: 2023-09-21

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Abstract

The Lower Cambrian Qiongzhusi Formation in southern Sichuan Basin is newly important replacement for exploration, development, and productivity construction in the Changning-Weiyuan National Shale Gas Demonstration Area. However, coring in this formation of Z201 well was confronted with such geological complexities as well developed high-angle wedged fractures with extensive distribution and long well intervals. Moreover, it is hard for cores to be picked out of the ground through traditional knocking, severely disrupting coring quality and efficiency. In order to improve and control knocking efficiency and force, a rapid picking tool was independently developed, and some supporting technologies were formed, including (i) to change knocking locations and to shorten the distance between two points of knocking and blocking, thereby increasing an vibration effect; (ii) to optimize tool structure, to expand an contact area of knocking, to reduce vibration stress, and to control damage to coring cylinders; and (iii) to optimize operational process, to precisely condition knocking force and strengthen inspection and maintenance after use, and to minimize damage to the cylinders. These technologies have been applied to 14-trip coring in Qiongzhusi Formation of Z201 well, achieving coring footage of 171.50 m, core length of 170.50 m, core recovery as high as 99.42%, core integrity rate of 100%, and cylinder availability of 100%, respectively.

Key words： Southern Sichuan Basin; Shale gas well; Early Cambrian; Coring; Core picked out; Complexity

Cite this article

WANG Jun , DUAN Xulin , YU Xingying , HUANG Yubo , WU Yunkai , LI Yu , LEI Liou . Coring technologies for complex reservoirs of Longwangmiao Formation with high-angle fractures[J]. Natural Gas Exploration and Development, 2023 , 46(3) : 140 -145 . DOI: 10.12055/gaskk.issn.1673-3177.2023.03.017

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