吴起油田楼坊坪油区深层含油层系开发井网密度研究

Study on Development Well Pattern Density of Deep Oil-Bearing Strata in Loufangping Oil Area of Wuqi Oilfield

摘要: 为了合理、高效地开发未动用的长8、长9油层，需要确定一套合理的井网系统，以便积累经验，指导吴起油田其他深层含油区域进行高效、合理开发；将研究区长8、长9油藏水驱采收率20%以及相关参数，依据不同流度下井网密度与采收率的关系，得出研究区井网密度分别为6.8口/km²；结合延长油田西部三叠系已开发油田的实际井网密度9.2~18口/km²，综合考虑新、老井网衔接，确定出长8、长9油藏开发井网密度宜在10~15口/km²、300 m井距部署的井网密度基本适合；在对研究区最大主应力与裂缝方位分析的基础上，井网方案部署在原部署的300 m~300 m近正方形井网的基础上尽量继承原井网形式，采用300 × 300正方形反九点布井，注水采用反九点法投注；该项研究结果对把本区乃至整个吴起油田深层油藏开发具有一定的指导价值。

Abstract: In order to develop the unused Chang 8 and Chang 9 reservoirs reasonably and efficiently, it is necessary to establish a set of reasonable well pattern system to accumulate experience and guide the efficient and reasonable development of other deep oil-bearing areas in Wuqi oilfield. The water flooding recovery factor of Reservoirs 8 and 9 is studied in the research area, along with the relevant parameters. Based on the relationship between different well spacing densities and recovery rates at various flow rates, well spacing densities of 6.8 wells per kilometer are determined for the study area. Based on the actual well pattern density of 9.2~18 Walls/km² in the developed Triassic oil fields in the west of Yanchang Oilfield, considering the connection of new and old well patterns, it is determined that the development well pattern density of Chang 8 and Chang 9 reservoirs should be 10~15/km², and the well pattern density deployed at 300 m well spacing is basically suitable. On the basis of the analysis of the maximum principal stress and fracture orientation in the study area, the well pattern plan is deployed on the basis of the original 300 m~300 m square well pattern as far as possible to inherit the original pattern, using 300 × 300 square reverse nine-point well layout, and using the reverse nine-point injection method. The results of this study have a certain guiding value for the development of deep reservoir in this area and even the whole Wuqi oilfield.