Characteristics and monitoring method of the trajectory of the radial CBM well

XIN Kai; JI Changjiang; XIAO Chun

doi:10.3969/j.issn.1001-1986.2020.06.018

Volume 48 Issue 6

Dec. 2020

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COAL GEOLOGY & EXPLORATION > 2020 > 48(6): 130-137. > DOI: 10.3969/j.issn.1001-1986.2020.06.018

XIN Kai, JI Changjiang, XIAO Chun. Characteristics and monitoring method of the trajectory of the radial CBM well[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(6): 130-137. DOI: 10.3969/j.issn.1001-1986.2020.06.018

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Characteristics and monitoring method of the trajectory of the radial CBM well

1. Shanxi Lanyan Coalbed Methane Engineering Research Co. Ltd., Jincheng 048000, China;
2. School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China;
3. State Key Laboratory of Coal and CBM Co-Mining, Jincheng 048000, China;
4. China Gold Group Geology Co. Ltd., Beijing 100012, China

Funds:

National Science and Technology Major Project(2016ZX05067-001-008)；Shanxi Science and Technology Major Project (20191102001)；Shanxi Basic Research Project(2016012012)

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Received Date: August 11, 2020
Revised Date: October 25, 2020
Published Date: December 24, 2020

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Abstract

Abstract

In order to find out whether the trajectory of radial well branch in coal seam is consistent with the design scheme to ensure the effect of permeability enhancement and reservoir reconstruction by radial well, by means of the combination of small-scale surface and field test, the influencing factors of radial well trajectory in coal reservoir were firstly studied. Based on the principle of the potentiometry monitoring technology, the feasibility of this method for the radial well trajectory monitoring was analyzed. On this foundation, the monitoring method and the technology of coal reservoir radial well tra-jectory based on potentiometry was established, and the field monitoring analysis was carried out. The results show that the trajectory of radial well in coal seam is mainly controlled by the original fractures, ground stress, weak structural surface and other factors. In the process of jet, the borehole azimuth usually deflected in different degrees, and the angle was between 15° and 30°. The branch injection length of radial well was also shorter than the designed one. The change of radial well trajectory parameters, such as azimuth and length, could be monitored clearly by potentiometry. The research results could effectively guide the design and construction of the radial well in coal reservoir.
- coalbed methane,
- radial well,
- bore hole trajectory,
- potentiometry,
- monitoring

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