Research on Potential Tapping of Remaining Oil along Fault Edge of Transition Belt

Abstract The remaining oil in the local area near the fault is still relatively enriched, which is the focus of further exploration. However, most of the remaining oil at the edge of the fault is located in areas where injection and production wells cannot control or utilize it effectively. In response to the difficulties and problems encountered in the development process of the fault edge at the X transition belt in A Oilfield, the target well group was determined based on the optimal boundary of the potential zone at the fault edge, and the remaining oil potential was evaluated. By analyzing the characteristics of fault development, principles for deploying oil production wells at fault edges, sedimentary features of oil reservoirs, development status of oil reservoirs, and distribution characteristics of remaining oil, a refined understanding of the reservoir was achieved, and targeted development adjustment strategies were determined. The “standing at high points, digging out corners” approach was adopted to reasonably deploy highly deviated directional wells, achieving effective tapping of remaining oil in the lower part of the fault; The degree of completeness of the injection production relationship near the fault is low. After the production of the highly deviated directional well, it is beneficial to maintain the development effect of the large displacement directional well by supplementing the hole through appropriate layers; In transitional belt areas, the third-type of oil reservoirs have multiple layers, small thickness, poor physical properties, and high clay content. The “pressure drive” technology can quickly send the oil displacement fluid through fractures to the deep part of the reservoir, effectively improving the oil displacement efficiency. This development adjustment strategy is of great value in improving the recovery rate of low yield and low efficiency areas in the transition belt of A Oilfield.