基于缝控压裂优化设计的致密油储集层改造方法  

A novel approach of tight oil reservoirs stimulation based on fracture controlling optimization and design

作　　者：雷群[1] 翁定为[1,2] 管保山 慕立俊[3] 胥云 王臻[1] 郭英[1,2] 李帅 LEI Qun;WENG Dingwei;GUAN Baoshan;MU Lijun;XU Yun;WANG Zhen;GUO Ying;LI Shuai(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Stimulation Department of National Energy Tight Oil and Gas R&D Center,Langfang 065007,China;First Oil Factory of Changqing Oilfield Company,PetroChina,Yan’an 716000,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]国家能源致密油气研发中心储层改造部,河北廊坊065007 [3]中国石油长庆油田第一采油厂,陕西延安716000

出　　处：《石油勘探与开发》2020年第3期592-599,共8页Petroleum Exploration and Development

基　　金：国家科技重大专项“储层改造关键技术及装备”(2016ZX05023);国家科技重大专项“低渗-超低渗油藏提高储量动用关键工艺技术研究”(2017ZX05013-005)。

摘　　要：针对致密油储集层水平井多段多簇施工时多条裂缝同时扩展引起的应力干扰,以及大规模压裂时压裂液进入储集层基质引起润湿性反转、改变储集层物性等特点,建立了非平面三维裂缝扩展模型,并引入润湿反转表征参数、相对渗透率曲线变化等修正了压裂水平井生产动态预测模型,编制了地质工程一体化压裂优化设计软件(FrSmart),提出了基于缝控压裂优化设计的致密油储集层改造方法,并分析了该方法的适用性、优化了致密油储集层水平井裂缝参数。研究表明,缝控压裂技术适用于致密油储集层等品位级别的非常规资源;缝控压裂人工裂缝参数优化可实现对致密油储集层等非常规油气资源井控单元内储量的最大动用。采用缝控压裂技术优化设计的主要关键点包括:提高水平段长度,缩小水平井排距;大幅度提高段内射孔簇数,缩小裂缝间距;避免新井老井压裂干扰。现场试验证实,缝控压裂技术可以提高单井产能进而提高区块采出程度。缝控压裂技术与油气田开发进一步融合,可大幅度提高中国致密油等非常规资源的开发效益。To deal with the stress interference caused by simultaneous propagation of multiple fractures and the wettability reversal and physical property changes of the reservoir caused by fracturing fluid getting in during large volume fracturing of tight oil reservoirs through a horizontal well,a non-planar 3D fracture growth model was built,wettability reversal characterizing parameters and change of relative permeability curve were introduced to correct the production prediction model of fractured horizontal well,a fracturing design optimization software(FrSmart)by integrating geological and engineering data was developed,and a fracturing design optimization approach for tight oil reservoirs based on fracture control was worked out.The adaptability of the method was analyzed and the fracture parameters of horizontal wells in tight oil reservoirs were optimized.The simulation results show that fracturing technology based on fracture control is suitable for tight oil reservoirs,and by optimizing fracture parameters,this technology makes it possible to produce the maximum amount of reserves in the well-controlled unit of unconventional reservoirs.The key points of fracturing design optimization based on fracture control include increasing lateral length of and reducing the row spacing between horizontal wells,increasing perforation clusters in one stage to decrease the spacing of neighboring fractures,and also avoiding interference of old and new fracturing wells.Field tests show that this technology can increase single well production and ultimate recovery.Using this technology in developing unconventional resources such as tight oil reservoirs in China will enhance the economics significantly.

关 键 词：致密油 储集层改造 水平井 缝控压裂 分段多簇压裂 裂缝参数 

分 类 号：TE357[石油与天然气工程—油气田开发工程]