Title: Study and application of evaluation method for fracability of deep CBM reservoir - taking the Daning-Jixian block in the Ordos Basin as an example

Authors: Duo Wang; Zhidi Liu

Addresses: School of Petroleum Engineering, Xi'an Shiyou University, No. 18, East Section of Dianzi Second Road, Xi'an City, Shaanxi Province, 710065, China ' School of Earth Science and Engineering, Xi'an Shiyou University, No. 18, East Section of Dianzi Second Road, Xi'an City, Shaanxi Province, 710065, China

Abstract: The key to increasing production of deep coalbed methane is to evaluate the fracability of the reservoir, but existing methods cannot meet the requirements of fracability evaluation. This study is based on the close relationship between the main controlling factors of fracability and the operation pressure during the sand carrying fluid stage. AHP was used to determine the weights of the main controlling factors of fracability in coal seams and roof and floor, and based on this, a deep coalbed methane reservoir fracability evaluation model was established. The fracability of the 8 # coal seam and the roof and floor of the Daning Jixian block was evaluated using this model, and the evaluation results can be confirmed by the on-site fracturing operation and the fracability indoor experimental results. Therefore, this model can provide good technical support for the stimulation and transformation of deep coalbed methane reservoirs. [Received: August 2, 2023; Accepted: November 27, 2023]

Keywords: deep CBM; AHP; main control factors; operation pressure; fracability.

DOI: 10.1504/IJOGCT.2024.138685

International Journal of Oil, Gas and Coal Technology, 2024 Vol.35 No.4, pp.407 - 441

Received: 31 Jul 2023
Accepted: 27 Nov 2023
Published online: 24 May 2024 *

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