致密油藏多轮次注水吞吐动态应力场及裂缝扩展规律研究

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Abstract Multi-cycle water huff-and-puff is an effective technique for replenishing formation energy and enhancing single-well productivity in tight oil reservoirs. Existing hydro-mechanical coupling mathematical models overlook the nonlinear flow parameters，and the dynamic changes in in-situ stress and fracture morphology throughout multi-cycle water huff-and-puff processes demand urgent investigation. This study has established a mathematical model of coupled flow，geomechanics and fracture propagation，which considers nonlinear flow in tight oil reservoirs，has developed a numerical simulation methodology for multi-cycle water huff-and-puff. The CP1 horizontal well in the Changqing Oilfield，located in the Ordos Basin，is used as a case study to explore the evolution of dynamic in-situ stress and fracture propagation during multi-cycle water huff-and-puff. The research findings indicate that：(1) Prolonged depletion development of horizontal well results in a reduction of principal horizontal stresses near the wellbore and an increase in principal stress difference；(2) By the end of the water injection period in the first cycle，the principal horizontal stresses increase and the principal stress difference decreases. As the number of cycles increases，the principal horizontal stresses decrease at the end of each water injection period，while the principal stress difference increases，with a maximum directional deviation of 10°to 30°of principal stresses；(3) The water injection period extends the fractures and generates branch fractures，and the extent of fracture propagation decreases with each cycle，stabilizing in morphology after three cycles. These results provide valuable guidance for optimizing water huff-and-puff schemes and transforming development strategies in tight oil reservoirs.

Key words： rock mechanics tight oil reservoir multi-cycle water huff-and-puff；nonlinear flow coupling of flow-geomechanics-fracture propagation stress evolution complex fracture propagation

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	ZHOU Jinchong1
	CAO Renyi1
	PU Baobiao1
	WANG Jiwei2
	LYU Bingchen1
	YI Qi3
	4

Cite this article:

ZHOU Jinchong1,CAO Renyi1,PU Baobiao1, et al. Study on dynamic in-situ stress and fracture propagation of multi-cycle water huff-and-puff in tight oil reservoirs[J]. , 2024, 43(12): 3005-3017.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/3005

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