摘要
如何有效开发动用低渗透油田储量,建立合理的井网系统是关键技术之一。MB油田为特低渗透、异常高压砂砾岩油藏,目前尚未正式投入开发。为更好地开发该油田,开展了建立有效驱动压力系统的井网井距研究工作。通过合理井网的系统研究,认为要建立有效的驱替压力系统,初期应布置成注采井数比小、注水波及系数高、初期具有一定采油速度的反九点井网。而且,在开采过程中,该井网可以根据实际情况适时地按照压力保持水平转为五点井网。MB油田的合理井距为200～250m为宜。现场先导试验结果表明,在此井距下,注入水才能够较好地驱替地层原油,注采井之间才能建立有效的驱替关系。
MB oilfield belongs to extra-low permeability,abnormal high pressure conglomerate reservoirs,and it hasn't been developed.In order to effectively develop the oilfield,the rational injection-production pattern system was studied.At early production period,the inverted nine-spot injection pattern should be adopted,it has the features of high waterflood sweep efficiency and low injection-production well ratio,and the pattern could be changed into five-spot flood system based on the formation pressure.Field application results showed that the reasonable well spacing was 200～250m in MB oilfield.
出处
《钻采工艺》
CAS
北大核心
2013年第4期67-69,138,共3页
Drilling & Production Technology
基金
教育部博士点基金(20105121110006)资助
关键词
低渗透油藏
砂砾岩油藏
有效驱动
井网井距
low permeability reservoir,conglomerate reservoir,effective development,well spacing,well pattern
