鄂尔多斯盆地某区块油井见水特征分析

针对鄂尔多斯盆地某研究区在注水过程中油井容易发生过早见水和水淹、产量下降快、采收率低的问题,利用见水特征曲线对研究区单井进行了见水特征分析,判断出单井的见水类型,根据不同的见水类型提出不同的解决措施。研究结果表明,研究区开发前期属于条带型见水;开发中期,裂缝发育的区块属于裂缝型见水,裂缝不发育的区块属于水锥型见水;开发后期,整个区块都属于层状型见水。

Water breakthrough characteristics of some block in Ordos basin

In view of the problems occurred in the process of water injection wells in the study area of Ordos basin, the oil well is prone to appear early water breakthrough, water flooding, rapid production decline and low recovery. By using the water breakthrough characteristic curve, the water breakthrough characteristics of a single well in the study area were analyzed, the water breakthrough types were determined, and different solutions to the different types of water breakthrough were put forward. The results show that the development in the early stage belongs to the strip type of water breakthrough. In the middle stage of development, the fractured blocks belong to the fractured water breakthrough type, while the non-fractured blocks belong to the water-coning water breakthrough type. At the later stage of development, the whole block belongs to a stratified water breakthrough type.