特低渗砾岩油藏有效驱动压力系统评价及对策

Evaluation and countermeasures on effective driving pressure system of ultra-low permeability conglomerate reservoir

屈怀林 刘红现 覃建华 熊维莉 赵逸清 王欣

中国石油新疆油田公司勘探开发研究院，新疆 克拉玛依 834000

Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China

根据克拉玛依特低渗砾岩油藏非线性渗流特点，采用极限渗透率法定义了有效驱动压力系统评价指标，结合油藏开发井网的实际情况，建立了五点压裂井网驱动压力系统评价模型，并根据建立的模型分析了有效压力系统的影响因素，即期望产能、注采压差、压裂规模和井距（排距）；同时，提出建立有效压力系统的主要对策为加密井网、增大压裂规模、增加注采压差。现场应用效果表明，提出的对策为该类油藏建立有效压力驱动系统具有指导意义。

According to the nonlinear flow characteristics of ultra-low permeability conglomerate reservoir in Karamay, limit permeability method is adopted to define the evaluation index of effective driving pressure system in this paper. Combined with the real situation of development well pattern of the reservoir, the driving pressure system evaluation model is built for five-spot well pattern which has to be fractured before production. Based on the built model, the influencing factors such as expected productivity, injection-projection pressure difference, fracturing scale and array pitch are analyzed. Analysis suggests that infilling well pattern, increasing fracturing scale and injection-projection pressure difference are the main countermeasures for building the effective driving pressure system. The field application results show that the proposed countermeasures have good guiding significance for building the effective driving pressure system for the same reservoir.

10.6056/DKYT201306018