致密油藏压裂定向井多层合采非稳态产能预测模型  

Non-steady-state Productivity Prediction Model for Multi-layer Fractured Directional Wells in Tight Oil Reservoirs

作　　者：王代刚 石宇哲 李国永[2] 牛文娟 赵耀 胡哲 耿文爽 宋考平 WANG Dai-gang;SHI Yu-zhe;LI Guo-yong;NIU Wen-juan;ZHAO Yao;HU Zhe;GENG Wen-shuang;SONG Kao-ping(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China;Jidong Oilfield Branch Company,CNPC,Tangshan 063000,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油天然气股份有限公司冀东油田分公司,唐山063000

出　　处：《科学技术与工程》2025年第9期3646-3656,共11页Science Technology and Engineering

基　　金：国家自然科学基金(52174043);中国石油科技创新基金(2022DQ02-0208)。

摘　　要：中国致密油储层具有薄互层纵向交互发育、储层非均质性严重等特点,为实现产能及经济效益最大化,普遍采用一套井网分层压裂多层合采的开发方式。然而,现有压裂定向井产能模型仅适用于单层开采,忽略层间干扰的影响,对预测多层合采条件下油井的产能适用性差。为了提高产能预测的准确性,将致密油藏压裂定向井附近流场划分为主裂缝区、压裂改造区和基质未改造区,综合考虑致密储层分区流动形态,同时引入干扰系数,建立了致密油藏压裂定向井多层合采非稳态产能预测模型,研究了裂缝半长、裂缝导流能力、启动压力梯度、应力敏感、储层非均质性等因素对压裂定向井产能的影响规律。结果表明:启动压力梯度、应力敏感效应和纵向非均质性对压裂定向井的产能具有显著影响,启动压力梯度越大、应力敏感效应和纵向非均质性越显著,压裂定向井的产能越低;随着裂缝半长、裂缝导流能力及基质渗透率的逐渐增大,压裂定向井的产能越高,但各自存在最优范围。产能影响因素的重要性综合排名依次为:基质渗透率、裂缝导流能力、裂缝半长、启动压力梯度、纵向非均质性、应力敏感效应。China's tight oil reservoirs have distinctive characteristics,including thin interbedded layers with alternate distribution in the longitudinal direction and strong reservoir heterogeneity.In order to maximize productivity and economic benefits,a development approach was commonly employed,involving a well network with layered fracturing for the simultaneous development of multiple layers.However,existing productivity models for fractured directional wells are only applicable to single-layer development and do not consider inter-layer interference,making them unsuitable for predicting well productivity of multi-layer development.In order to improve the accuracy of productivity prediction,the flow field nearby the fractured directional well is divided into the main fracture region,the stimulated reservoir volume region,and the un-stimulated reservoir volume region.Considering the effects of flow patterns in different regions and stress sensitivity,and introducing a disturbance coefficient,a non-steady-state productivity prediction model for multi-layer fractured directional well in tight oil reservoirs was established.After validating the model accuracy,the influence of fracture half-length,fracture conductivity,threshold pressure gradient,stress sensitivity and reservoir heterogeneity on the productivity of fractured directional well was further investigated.The results indicate that the threshold pressure gradient,stress sensitivity and longitudinal heterogeneity significantly affect the productivity of fractured directional well.The larger the threshold pressure gradient,and the more significant the stress sensitivity and longitudinal heterogeneity,the lower the productivity of fractured directional wells.With the gradual increase in fracture half-length,fracture conductivity,and matrix permeability,the productivity of fractured directional wells increases,but each factor has its optimal range.The ranking of factors affecting productivity is as follows:matrix permeability,fracture conductivity,fracture half-leng

关 键 词：致密油藏 压裂定向井 产能预测 干扰系数 非稳态 敏感因素 

分 类 号：TE348[石油与天然气工程—油气田开发工程]