碳酸盐岩潜山裂缝性油藏异步注采研究  

Asynchronous Injection-production Research on Carbonatite Buried Hill Fractured Reservoir

作　　者：刘剑[1] 刘月田[1] 梁武全 李二鹏[3] 魏俊[4] 程道伟 

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油辽河油田沈阳采油厂地质所,沈阳110316 [3]中国石油塔里木油田分公司勘探开发研究院,库尔勒841000 [4]中海油能源发展股份有限公司钻采工程研究院,天津300452

出　　处：《科学技术与工程》2013年第36期10811-10816,共6页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05009)资助

摘　　要：碳酸盐岩潜山油藏储集空间类型多样,孔隙结构复杂,裂缝非常发育,连通情况好,储层的非均质性严重。注水开发时水窜严重、水驱采收率低、开发效果差。针对该类油藏的地质特点及注水开发中存在的问题,以胜利油田某古潜山油藏为例,对该类油藏展开异步注采研究。利用数值模拟方法优化了异步注采单周期注入量、注入速度、关井时间、采液速度等参数,预测了衰竭式开采、连续注水、常规周期注水、异步注采4种开发方式15年末的采出程度。数值模拟结果表明:异步注采15年末采出程度为28.63%,比衰竭式开采、连续注水、常规周期注水分别高3.21%,0.82%,0.21%,采用异步注采取得了比其他开发方式更好的开发效果。异步注采有效避免了注入水沿裂缝向生产井窜进,注采不同步产生的压力扰动有利于注入水进入基质系统较深的孔喉中,扩大了波及体积;关井使得裂缝与基质的渗吸交换作用进行的更充分。建议对碳酸盐岩潜山油藏开发时,采用异步注采的开发方式。Carbonatite buried hill fractured reservoir have features in various space, complex pore structure, well-developed fractures with high connection. Water injection could cause serious water channeling, low recovery efficiency of waterflooding and poor development. Regarding to geologic characteristic and problems during water- flooding development, asynchronous injection-production on this type reservoir is reserehed which takes certain bur- ied hill reservoir in Shengli oilfield as example. This research has optimized asynchronous injection-production＇ s single period parameters, including injection volume, injection rate, shut-in time, production rate, and predicted recovery percent at the end of 15th year for depleting development, continuous water injection, conventional cyclic water injection, asynchronous injection-production development mode by numerical simulation method. The results indicate that asynchronous injection-production mode recovery percent at the end of 15th year reaches 28.63%, 3.21% ,0. 82% ,0.21% higher than depleting development, continuous water injection, conventional cyclic water injection respectively, and thus achieves better development over other development modes. Besides, water channe- ling is effectively avoided and sweep volume increases because that injection water percolated into deep pore throat of matrix system due to pressure disturbance caused by asynchronous injection-production development mode; in addition, soak process could significantly improve imbibition between fracture and matrix. Therefore asynchronous injection-production is recommended during the development of carbonatite buried hill fractured reservoirs.

关 键 词：碳酸盐岩 裂缝 异步注采 参数优化 开发方式 

分 类 号：TE344[石油与天然气工程—油气田开发工程]