摘要
层系井网与油层的适应性是影响油田开发效果的重要因素,始终贯穿油田开发的不同阶段。以X区块为例,针对纵向上层间干扰严重、平面上注采井距过大、多套井网交叉造成井距不均匀等矛盾,从开发历程入手,结合油田开发现状,分析了井网演变过程;剖析了油田开发中层系井网存在的问题,在理论分析和油藏工程方法相结合的基础上确定了层系井网技术经济界限,制定了层系组合原则,确定了纵向上细划层系与平面上缩小井距相结合的井网调整方式。结果表明:X区块在层系井网调整实施后,层间矛盾缓解,井段跨度减小,渗透率变异系数下降;平面上井距更加合理,水驱控制程度和多向连通比例增加;新井投产效果较好;老井效果明显,产量上升,含水率下降;全区含水率下降,产量递减减缓,X区块预测可提高采收率5.5百分点。研究成果对今后油田类似区块的开发具有指导意义。
The adaptability between the stratigraphic-series well patterns and reservoirs is the important factor that influences the effects of the oilfield development,and moreover the influence lasts through different oilfield development stages all the time.Taking Block X as an example,aiming at the contradictions such as the severe interference among the vertical upper layers,too large planar injection-production well spacing,uneven well spacing caused by the crossing of the multiple well patterns and so on,and moreover from the viewpoint of the development process and integrating with the current situation of the oilfield development,the evolution process of the well patterns was analyzed;the existing problems in the stratigraphic-series well patterns in the oilfield development were analyzed as well,based on the combination between the theoretical analysis and reservoir engineering methods,the technical and economic limits of the well patterns were determined,the combining principle of the stratigraphic series was formulated,and furthermore the well-pattern adjusting mode was determined as well for the combination between the finely stratified series in the vertical direction and the shortened well spacing in the plane.The results show that after the adjustment of the stratigraphic-series well patterns in Block X,the inter-layer contradiction has been alleviated,the interval span has been reduced and the permeability variation coefficient has been decreased;the well spacing on the plane is more reasonable,the controlled degree of the water drive and the multi-directionally connected proportion are increased;the effects of the new drilled and produced well are pretty better,while the effects of the old well are obvious,the production increases and the water cut decreases;the water cut in the whole block decreased and the production decline slows down,the predicted recovery in Block X can be enhanced by 5.5 percentage points.The research results possess a certain guiding significance for the development of the similar blocks in the oilfield in the future.
作者
金艳鑫
JIN Yanxin(College of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2020年第2期86-93,共8页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气集团公司“十三五”科技开发攻关项目“高/特高含水油田改善水驱效果关键技术”(2019B-1209)。
关键词
层系
井网
优化
调整方式
特高含水期
stratum/stratigraphic series
well pattern
optimization
adjustment mode
extra-high watercut period
