复杂断块油藏水平井二氧化碳吞吐控水增油技术及其应用  

Research and application of water-control and oil-enhance for horizontal wells CO_2 huff and puff in complex fault-block reservoir

作　　者：李国永[1] 叶盛军[1] 冯建松[1] 石琼林[1] 冯旭光[1] 王佳音[1] 

机构地区：[1]中国石油冀东油田分公司陆上油田作业区,河北唐海063200

出　　处：《油气地质与采收率》2012年第4期62-65,115,共4页Petroleum Geology and Recovery Efficiency

基　　金：中国石油天然气集团公司重大专项"水平井控水技术研究与现场应用"(2008F-1506)

摘　　要：水平井是冀东南堡陆地油田浅层复杂断块油藏的主要开采方式,大部分水平井已进入特高含水阶段。构造因素、井身轨迹、生产制度和外来入井液是引起水平井含水率非正常上升的主要原因。通过对二氧化碳最小混相压力预测、产出流体的分析以及油藏数值模拟研究,认为水平井二氧化碳吞吐控水增油的主要机理包括: 膨胀原油体积、对原油的降粘作用和对轻烃的萃取作用。基于优化的工艺设计方案,确定了单井注入量、注入速度和焖井时间等参数。32井次的现场应用结果证实,产油量由吞吐前的52t/d上升到吞吐后的271t/d,是原来的5.2倍,综合含水率由吞吐前的96.9%降至吞吐后的53.4%,控水增油效果显著。二氧化碳对橡胶的腐蚀性较强,合适的举升方式为抽油泵,井口至井下500m内应尽量避免安装对温度敏感的工具。Horizontal wells are the main development mode in Jidong Nanpu onshore shallow complex fault-block reservoir. Most horizontal wells have entered the high water cut stage. The reasons caused abnormal raise of water cut includes tectonic, well trajectory , production system and impact of external fluid. The mechanism of water-control and oil-enhance for horizontal wells CO2 huff and puff includes expansion of the crude oil volume, reduction of the viscosity, and extraction for light hydrocarbon, according to the prediction of CO, minimum miscibility pressure, laboratory analysis of fluid output and reservoir simulation. We determine the single well injection, injection rate, soaking time and other parameters based on the optimization of process design. Implementation of 32 wells and related technical experiments show that, it achieved significant results in water-control and oil-enhance, and shows a good prospect for field promotion.

关 键 词：复杂断块油藏 水平井 二氧化碳吞吐 最小混相压力 控水 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]