Optimal key elements of geoengineering integration in Changning National Shale Gas Demonstration Zone

doi:10.3969/j.issn.1672-7703.2019.02.005

Abstract

Abstract: The Changning National Shale Gas Demonstration Zone is a representative case in China's shale gas industry. Its development has transited from the engineering exploration and practice initially to the comprehensive geoengineering integration in the third stage. For purpose of "single-well production increase and overall efficiency improvement", it is necessary to make full use of various geological and engineering data to systematically study four optimal key elements:horizontal well box, fracturing stimulation, production system and development technology, aiming to continuously increasing production from single well to full gas field, and improving the estimated ultimate recovery (EUR) and economic indicators. A 3D shared geoscience model based on geoengineering integration can perform system analysis and evaluation of project implementation effects by multidisciplinary and multi-parameter data analysis, multi-field coupled simulation on stress-sensitive shale (including geomechanics, modeling hydraulic fracture network and gas reservoir numerical simulation) and full gas field numerical simulation. By comparing multiple programs under current technical conditions, optimal box position and production system have been defined. Also, fracturing parameters and process, well location and spacing have been established. In order to achieve overall optimization, it is proposed that geoengineering integration should transform from well-based integration of drilling, completion fracturing and production to full gas field-based development project. As a response, numerical simulation to stress-sensitive shale was carried out on full gas field for the first time at home and abroad.

Key words: geoengineering integration, shale gas, horizontal well, hydraulic fracturing, numerical simulation

CLC Number:

Xie Jun, Xian Chenggang, Wu Jianfa, Zhao Chunduan. Optimal key elements of geoengineering integration in Changning National Shale Gas Demonstration Zone[J]. China Petroleum Exploration, 2019, 24(2): 174-185.

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