Asynchronous Injection–Production Method in the High Water Cut Stage of Tight Oil Reservoirs

Jianwen Chen, Dingning Cai (), Tao Zhang, Linjun Yu, Dalin Zhou and Shiqing Cheng ()
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Jianwen Chen: No. 12 Oil Production Plant, Changqing Oilfield Company, China National Petroleum Corporation (CNPC), Qingyang 745400, China
Dingning Cai: College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Tao Zhang: No. 12 Oil Production Plant, Changqing Oilfield Company, China National Petroleum Corporation (CNPC), Qingyang 745400, China
Linjun Yu: No. 12 Oil Production Plant, Changqing Oilfield Company, China National Petroleum Corporation (CNPC), Qingyang 745400, China
Dalin Zhou: No. 12 Oil Production Plant, Changqing Oilfield Company, China National Petroleum Corporation (CNPC), Qingyang 745400, China
Shiqing Cheng: College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China

Energies, 2024, vol. 17, issue 19, 1-14

Abstract: Asynchronous injection–production cycle (AIPC) in a horizontal–vertical well pattern is an efficient strategy for enhancing water injection in tight reservoirs. However, current studies lack consideration of waterflood-induced fractures (WIFs) caused by long-term water injection. This paper takes block Z in the Ordos Basin, China, as the research object and first clarifies the formation conditions of WIFs considering the horizontal principal stress and flow line. Then, the pressure-sensitive permeability equations for the induce-fracture region between wells are derived. Finally, the WIFs characteristics in a horizontal–vertical well network with different injection modes are discussed by numerical simulation. The results show that WIFs preferentially form where flow aligns with the maximum principal stress, influencing permeability distribution. Controlling the injection rate of vertical wells on the maximum principal stress and flow line and cyclically adjusting the production rate of horizontal wells can regulate the appropriate propagation of WIFs and expand the swept areas. The parallel injection mode (PIM) and the half-production injection mode are superior to the full-production injection mode. This study can provide theoretical support for the effective development of tight oil reservoirs.

Keywords: asynchronous injection–production cycle (AIPC); waterflood-induced fracture; horizontal–vertical well network; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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