玛18井区低渗透异常高压油藏开发参数研究

Development Parameters of Low-Permeability Abnormal High-Pressure Reservoir in Well Ma18

艾湖油田玛18井区属于典型的低渗异常高压油藏,针对其开发早期阶段开发方式、井网、井距及生产动态参数认识不足等问题,以艾湖油田玛18井区的地质特征为基础,结合油藏工程和数值模拟方法,开展关键开发技术政策参数优化研究。研究结果表明:玛18井区天然能量充足,前期利用地层能量进行开发,地层压力降至50 MPa时采用水驱开发方式;注采井网采用菱形反九点井网,优化合理井距为300 m;T_1b_1作为主力开发层,注水开发12 a后T_1b_2作为接替层系进行开发;设计产能为9. 5 t/d、最优的注采比为1. 2时,20 a后最终采出程度为24. 52%。研究结果为研究区开发方案的编制和同类油藏的有效开发提供了技术支持。

The Wellblock Ma18 in Aihu Oilfield is a typical low-permeability reservoir with abnormal high pressure. The early stage development mode, well pattern and spacing and production parameters are researched based on the geology of Wellbloek Ma18. Reservoir engineering and numerical simulation are used to optimize the key develop- ment parameters. Research indicates that the Wellblock Ma18 with sufficient natural energy should be developed in depletion in the early stage. Waterflooding can be carried out when the formation pressure reduces to 50 MPa. The inverse diamond-shaped nine-spot well pattern is recommended with a reasonable well spacing of 300 m. T1b1 is taken as the main producing layer and T1b1 is taken as a successive layer after waterflooding for 12 years. The designed productivity is 9.5 t/d, the reasonable injection-production ratio is 1.2 and the final recovery degree is 24. 52%. This research could provide certain technical reference for the development program preparation and efficient development of other similar reservoirs.