延长油田低渗透储层压裂水平井产能预测模型  

A Production Forecast Model for Multi-fractured Horizontal Well in Low Permeability Reservoirs of Yanchang Oilfield

作　　者：张秋实[1] 何金宝[2] 胡志勇[1] 闫玉麟 王璐[1] 李存磊[1] ZHANG Qiu-shi;HE Jin-bao;HU Zhi-yong;YAN Yu-lin;WANG Lu;LI Cun-lei(Liaoning Shihua University,Fushun 113001,China;Drilling and Production Technology Research Institute,PetroChina Liaohe Oilfield Company,Panj in 124010,China;The Shale Oil Plant of Fushun Mining Group Co.,Ltd.,Fushun 113115,China)

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]辽河油田钻采工艺研究院,辽宁盘锦124010 [3]抚顺矿业集团有限责任公司页岩炼油厂,辽宁抚顺113115

出　　处：《当代化工》2022年第6期1420-1424,共5页Contemporary Chemical Industry

基　　金：辽宁省教育厅科学研究经费项目,基于半解析方法的复杂裂缝地层试井解释模型研究(项目编号:L2020025)。

摘　　要：低渗透储层进行大规模压裂改造是获得经济产能的主要手段,对压裂水平井压裂后产能预测具有重要指导意义。为此,基于鄂尔多斯盆地长8储层的物性特点和水平井压后裂缝的真实分布,建立了水平井多级压裂的半解析模型。根据压力叠加原理和点源函数的求解方法对裂缝进行离散,求得模型在定压力生产条件下的拉氏空间解;通过Stehfest数值反演,求得了水平井的产能。通过对水平井产能的影响因素裂缝半长、簇数、级数和裂缝的导流能力分析可知:裂缝的级数和半长对最终的产量影响较大;裂缝的簇数和导流能力对水平井早期的产能影响较大;在裂缝总长不变的情况下,裂缝的分布形态对产能的影响较小。本文的研究结果对于长8储层的压裂设计和产能评价具有重要意义。Large-scale fracturing reconstruction of low permeability reservoirs is the main means to obtain economic productivity. Predicting the productivity of fractured horizontal wells after fracturing has important guiding significance for fracturing construction. Therefore, based on the characteristics of Chang 8 reservoir in Ordos Basin and the real fracture distribution of a horizontal wells in this area, a physical model of multi-fractured horizontal well was established. According to the principle of pressure superposition and the principle of point source function, the fracture was discretized into many segments, each segment was assumed as a point source, and the partial differential equation was solved in Laplace domain under the condition of constant pressure production. Finally, the productivity of horizontal wells was obtained by Stehfest numerical inversion. Fracture half-length, cluster number, series and fracture conductivity were considered as factors affecting the productivity of horizontal wells and the sensitivities analysis was made. The results show that the series and half-length of fractures make a greater impact on the final productivity;Otherwise the cluster number and conductivity of fractures had an obvious impact on the early-stage productivity of horizontal wells;and the distribution pattern of fractures had a smaller impact on productivity when the total fracture length remained unchanged. The results of this study are of great significance to the fracturing design and productivity evaluation for Chang 8 reservoir.

关 键 词：水平井压裂 产能预测 裂缝分布形态 点源函数 

分 类 号：TE312[石油与天然气工程—油气田开发工程]