稠油油藏多薄层纵向缝压裂井产能计算模型  

Computational models for productivity of horizontal well with a longitudinal fracture in heavy oil multilayer reservoirs

作　　者：魏瑞[1] 赵志红[1] 梁豪[1] 陈立莹[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学,四川成都610500 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《石化技术》2015年第5期213-214,共2页Petrochemical Industry Technology

摘　　要：对于裂缝性多层稠油油藏采用水平井压裂纵向缝能够实现有效增产,为分析压裂井在产生纵向缝后的产能,考虑流体在压裂裂缝和水平井筒的变质量流动,以及水平井筒内摩阻压降、加速度压降及井筒内流体流态变化,建立了储层、裂缝渗流与水平井筒流动耦合的纵向缝压裂井产能预测模型。结果表明:对于已知油藏规模、流体粘度及裂缝导流能力下对应有唯一的压裂井比采油指数;纵向缝内压力垂向上呈台阶状分布,储层物性越好层段对应裂缝内压降越大;裂缝导流能力对产能影响较小;原油粘度对采油指数影响较大,降低原油粘度可大幅提高比采油指数。Horizontal well with a longitudinal fracture in heavy oil reservoirs is a good method in increasing production. To evaluate the performance of this kind of wells, a rigorous analytical model has been developed to predict the productivity of a multi-layered reservoir drained by a horizontal well with a longitudinal fracture, it rigorously couples the flow in the reservoir to that in the facture, and then to that in the wellbore. The friction, acceleration, and fluid-in flow effect, change in flow regime are also taken into account to describe the flow in the wellbore along with mass variable flows. Calculation results show that there exists the only fractured horizontal well productivity index given the capacity, fluid viscosity, and fracture conductivity of a reservoir; the distribution form of pressure in the fracture is characterized by ladder-shaped, pressure loss at the high permeability parts is larger; fracture conductivity has little effect on productivity; while fluid viscosity has great influence on specific productivity index, it is the key factor for enhancing production when lower that of crudes.

关 键 词：稠油 多层 压裂 水平井 纵向缝 产能 

分 类 号：TE328[石油与天然气工程—油气田开发工程]