薄互层砂体中层理缝对压裂裂缝扩展认识与实践  

Research and application of thin interbedded sand body fracturing technology

作　　者：尹虎琛 黄建宁[3] 董时正[3] YIN Huchen;HUANG Jianning;DONG Shizheng(Drilling&Production Engineering Technology Research Institute,Chuanqing Drilling Engineering Co.,Ltd.,Xi'an Shaanxi 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi'an Shaanxi 710018,China;Engineering Technology Management Department of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710018,China)

机构地区：[1]川庆钻探工程有限公司钻采工程技术研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油长庆油田分公司工程技术管理部,陕西西安710018

出　　处：《石油化工应用》2020年第11期65-69,共5页Petrochemical Industry Application

摘　　要：南梁油田W86区长4+5油藏储层厚度较大,平均油层有效厚度27.8 m,物性较差,局部纵向隔夹层发育。近年来,陆续在W222、W245等长4+5油藏找到出油井点,试油试采产量较好。前期储层改造方面存在纵向改造不充分,压后含水较高,油水关系复杂等问题,为了进一步认识该类储层的多层段叠合砂体、高水饱的特点,并结合目前区块开发实际,形成了多层段叠合砂体的压裂裂缝扩展规律创新认识,打破了储隔层应力差是形成缝高遮挡的唯一因素的传统认识,利用界面滑移特性提出了“精细多级分段改造”的主体方案,利用隔夹层层间效应为W86长4+5层厚砂体、薄互层发育、高水饱特征的储层改造提供技术借鉴。经过论证与现场应用,W86区块投产初期平均单井日产油2.4 t。取得了良好的改造效果。Nanliang W86 blocks Chang 4+5 reservoirs larger reservoir thickness,the average thickness of the reservoir effective 27.8 m,was poor,partial longitudinal development of the sandwich barrier.In recent years,in Chang 4+5 reservoirs of W222 blocks and W245 blocks in oil wells to find out the point,good oil test mining production.In order to further understand the multi-layer superimposed sand bodies in this kind of reservoirs,the characteristics of high water saturation are combined with the current block.The practice of the formation of a multi-layer superimposed sand body fracturing crack propagation law in-depth under standing of the proposed"fine multi-stage sub-transformation"of the main program,the use of interlayer effect for W86 blocks Chang 4+5 thick sand body,thin interbedded development,high water saturation characteristics of the reservoir to provide technical reference.After demonstration and field application,W86 block production of the initial average single-day oil production 2.4 t.It has made a good transformation effect.

关 键 词：多期叠合砂体 隔夹层发育 裂缝扩展 精细多级分段改造 

分 类 号：TE122[石油与天然气工程—油气勘探]