呼图壁储气库边底水水侵前缘动用及注采风险评价

具边底水储气库注采容易引起气水界面移动,水侵前缘运移及注采风险评估,对储气库水侵区库容的恢复和动用及注采井调峰能力的提升极其重要.以呼图壁储气库为例,评价了边底水储气库气水前缘恢复动用的可行性,利用示踪剂数值模拟技术确定注气前缘位置,通过多轮次注气驱替,提高储集层渗流能力.建立了影响注采井水侵的动、静态参数评价指标体系...

Producing of Edge and Bottom Water Invasion Front and Risk Assessment on Injection and Production of Hutubi UGS

Injection and production of a UGS (underground gas storage) with edge and bottom water is likely forcing gas-water contact to move, so it is necessary to assess the migration of water invasion front and the injection-production risk since it is very important for recovering the storage capacity and improving the peak shaving ability of injection and production wells. Taking the Hutubi UGS as a case, we evaluated the feasibility of recovering the gas/water front of the UGS with edge and bottom water, simulated the position of gas front by tracer numerical simulation technology, and enhanced the flow capacity of the reservoir by multiple cycles of gas flooding. Then an indicator system evaluating dynamic and static parameters that affect the water invasion in injection and production wells was established, and the risks of water breakthrough were evaluated in 30 injection and production wells in Hutubi UGS. It is found that there are only 3 wells with high water invasion risk in the study area, which are located in the western water invasion area. Finally, an early water invasion warning mechanism was proposed. The mechanism aims to monitor the production performance, record real-time production parameters such as water production, water-gas ratio, Cl^- content in produced water and wellhead pressure of the wells with medium–high water invasion risks, and adjust and optimize the injection and production rates and gas volumes, and as a result, control the advancing speed of the gas/water front.