复杂结构井开发低渗油藏的效果及关键问题研究

Study on the results of developing low permeability reservoirs through complex structural wells and the key problems to it

复杂结构井具有增大泄油面积、有效连通储层裂缝、提高储层导流能力的优势.通过对国内外低渗油藏开发现状的调研,对比分析了两种复杂结构井(压裂水平井和多分支水平井)开发低渗油藏的效果;研究了地应力与裂缝参数的关系.结果表明开发低渗油藏多分支水平井比压裂水平井有更多的优势,且两种复杂结构井在设计水平井眼走向时都要考虑与地应力的关系.

Complex structural wells have the advantages of increasing drainage area,effectively connecting reservoir cracks and increasing the flow conductivity of reservoir.The results of developing low permeability reservoirs through two kinds of complex structural wells—fractured horizontal well and multilateral horizontal well are analyzed and the relationship between earth stress based on the investigation of the domestic and overseas present situation of low-permeability reservoir development,and the parameters of the cracks are studied.The results show that the multilateral horizontal well is superior to fractured horizontal well for the development of the low permeability reservoirs,and it is necessary to consider the relationship between the earth stress and the trend of horizontal borehole in the design of two kinds of complex structural wells.It is reasonable that the trend of horizontal borehole is vertical to the direction ofthe largest horizontal principal stress.