塔河油田奥陶系油藏TK461井组油水分布概念模式研究

STUDY ON CONCEPTUAL MODEL OF OIL AND WATER DISTRIBUTION IN WELL GROUP TK461 OF ORDOVICIAN RESERVOIR IN TAHE OILFIELD,TARIM BASIN,CHINA

塔河油田奥陶系致密碳酸盐岩缝洞油藏的储集空间主要为天然裂缝和酸压裂缝沟通大型管道状洞穴构成的复杂系统。塔河油田四区TK461,TK435,TK455和TK432等4口相互连通的油井见水开发过程表明存在多个不同的边底水侵入通道;并不遵循由低到高逐渐见水的常规开发见水规律。实践表明在低部位的TK461井探索性注水使高部位TK432井的含水下降,高部位TK435变成不产水,而高部位不产水的TK455井的油产量明显提高。根据开发过程中的油水关系变化,建立了TK461井组的储层油水分布概念模式,指出了低部位注水可以增加高部位油井产量,同时可能实现对高部位高含水井从原水侵相反方向上补充剩余油体能量来减缓水体侵入,起到压制水锥增加产油量的效果。

The reservoir space of the Ordovician dense carbonate in Tahe Oilfield,the Tarim Basin,is a complex system,mainly composed of one or several large pipeline-shaped cavities which were communicated by natural and acid-fracturing fractures.The development performance shows that there are a number of different invading pathways of edge or/and bottom water bodies in Well Group TK461,which are different from the common water invading process from lower to higher position gradually.After water injection from Well TK461 in the lower-position,water production in Well TK432 decreased and Well TK435 produces no water but pure oil.The conceptual model of oil and water distribution has been established in Well Group TK461 according to the relationship between water and oil during the development.The model reveals that water injection from a well in the lower position may increase the energy of remaining oil in the wells in the upper position wells-from the reverse direction of the original invading pathway,resulting in water containing drop and control water coning in wells in the upper position.