Geology and engineering integrated development countermeasures of Chang 7 member shale oil reservoir in Jiyuan Oilfield, Ordos Basin: a case study of An 83 well block

doi:10.3969/j.issn.1672-7703.2022.05.011

Abstract

Abstract: Chang 7 member oil reservoir is a major production layer in Jiyuan Oilfield in Ordos Basin, which is characterized by deep burial depth, complex oil-water contact and strong reservoir heterogeneity, so the technology of geology and engineering integration is a necessary method to improve the result of water injection development. Guided by the integration of geology and engineering, rock mechanic parameters are corrected in calculation model established by lab test results, and rock mechanic parameters and in-situ stress of single well are calculated by core and logging data, mechanic parameter and in-situ stress field models of the block are built by random modeling method,and the distribution direction of hydraulic fractures is characterized according to the in-situ stress distribution. The development well pattern is optimally designed based on permeability and in-situ stress distribution. The numerical simulation technology is used to optimize well pattern and development countermeasures, and the model is established and continuously updated with the goal of EOR, forming an integrated technology of in-situ stress analysis, geological modeling, oil reservoir engineering design, and numerical simulation. The research shows that the flat management structure and multidisciplinary cooperation enable to efficiently develop oil reservoir. The integration of fine geological description and dynamic analysis supports to continuously update the geological model and establish a model closer to the real geological condition. The random modeling method constructed in-situ stress field model by using rock mechanic data of core samples, logging data and fracturing engineering data shows good agreement with dynamic performance, which provides a basis for dynamic analysis, well pattern optimization and deployment. The dynamic well pattern optimization and development technology countermeasures effectively guided the development of Chang 7 member oil reservoir in An 83 well block. During the refracturing process, the engineering parameters were optimally designed, with the half length of fracture of 120 m, the width of fracture of 30 m, conductivity of the main fracture of 15 D·cm, and that of the secondary fracture of 1 D·cm. Good results were achieved from the five optimized wells after construction, with oil production increase multiple significantly higher than that of the adjacent well, and production capacity increase by 30.46% of the adjacent well.

CLC Number:

TE319

Zhang Yi, Bu Xiangqian, Qi Yin, Yang Yongzhi, Chen Yazhou, Hou Xiaoyun, Wang Rui, Zhang Bin, Tong Song. Geology and engineering integrated development countermeasures of Chang 7 member shale oil reservoir in Jiyuan Oilfield, Ordos Basin: a case study of An 83 well block[J]. China Petroleum Exploration, 2022, 27(5): 116-129.

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