A Geology-engineering integration solution for tight oil exploration of the Chang-7 member, Yanchang Formation in the Ordos Basin – focusing on scientific well spacing and efficient drilling

doi:10.3969/j.issn.1672-7703.2020.02.015

Abstract

Abstract: The tight oil reservoirs of the Chang-7 member in the Longdong area of the Ordos Basin are primarily gravity flow sand bodies. The distribution of sand bodies is complex in both vertical and lateral directions, and the thickness of single sand bodies is thin, which poses a challenge to efficient drilling and production. In this paper, a set of geology-engineering integration methods are proposed, which combine multi-disciplinary knowledge such as near-bit ‘Measurement While Drilling’ (MWD) technology. On the basis of comprehensive geological research, 3D fine geology, reservoir, and geo-mechanics, models are established for selection of well locations, design of factory-like platforms, drilling operations, and optimization of geo-steering schemes. The aim is to design well trajectories scientifically and reasonably, enhance the penetration rate of sand bodies during drilling, and ensure higher single well production in later production stages as well as the ultimate long-term cumulative production of the well block. Results show that high-quality reservoirs in the study area are mainly massive clastic-flow sandstones. The key to improving penetration rates is to use real-time transmission MWD data, and comprehensively analyze drilling, well logging and mud logging data to determine accurate bit location in the sedimentary cycle in order to determine the geo-steering operation scheme. Guided by this method, two horizontal wells have been drilled, with penetration rates of oil layers 5?10% higher than those of the surrounding wells. According to early-stage numerical simulation based on geology and geo-mechanics models, combined with scientific well spacing during drilling and production practice, the optimum horizontal well spacing in the study area was finally determined to be 400 m.

CLC Number:

Feng Zhangbin, Ma Fujian, Chen Bo, Li Desheng, Chang Botao, Leng Xiangang, Chai Huiqiang, Wu Kai, Yang Yongxing, Wang Yongkang, Huang Yongjie, Ding Li, Li Zhijun, Lu Qingzhi, Pan Yuanwei, Hu Zhong, Fu Zairong, Wang Wei. A Geology-engineering integration solution for tight oil exploration of the Chang-7 member, Yanchang Formation in the Ordos Basin – focusing on scientific well spacing and efficient drilling[J]. China Petroleum Exploration, 2020, 25(2): 155-168.

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