Exploration on well group design for three-dimensional development of shale oil horizontal wells

Abstract:

Currently， the three-dimensional development of shale oil in China is still in the exploration stage. To construct an integrated and efficient production model of drilling， fracturing， and commissioning， it is necessary to carry out collaborative optimization of well group trajectory design and operation sequence. Taking an actual well pad in Minfeng Sag of Jiyang Depression as the research carrier， this paper focuses on two operating modes， namely "Vertical-Horizontal Push Tank" and "Horizontal-Vertical Push Tank". The closest approach method combined with Landmark software is adopted to systematically analyze the impacts of the position of kickoff points， the relative depth of kickoff points， and the build rate before target entry on collision risk， and targeted anti-collision measures are proposed. The research shows that the "Vertical-Horizontal Push" mode has lower overall collision risk and stronger adaptability through the design of trajectory plane staggering； while the "Horizontal-Vertical Push" mode has more complex anti-collision design and higher risk due to multiple trajectory crossings， and it is necessary to rely on the dual staggering optimization of kickoff points to reduce risks. The research results provide feasible technical support for the well group design of shale oil three-dimensional development and provide a reference for the well group optimization under different production models in the future.