塔河油田奥陶系油藏TK440井组注水压锥地质模式研究

塔里木盆地塔河油田奥陶系致密灰岩中的缝洞油藏储集空间主要为由天然裂缝和酸压裂缝沟通的一个或多个大型管道状洞穴构成的复杂系统.塔河油田四区TK440,TK449H和TK424C井等3口相互连通的油井见水直至水淹的开发过程表明产油层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特征.在3口油井水淹之后,通过低部位的TK440井探索性注水使高部位TK424C井含水下降,而TK449H则变成不产水,使两口井的油产量明显提高.根据注水过程中的油水关系变化研究,提出TK440井组的储层概念模式和全新的注水压雏模式,即低部位注水可能实现对高部位水淹井从原水侵相反方向上补充刺余油体能量,导致高部位水淹井含水下降起到压制水锥的效果,从而达到提高采收率的作用.

STUDY ON GEOLOGICAL MODEL OF PRESSURE CONING BY WATER INJECTION IN WELL GROUP TK440 OF ORDOVICIAN RESERVOIR IN TAHE OILFIELD,TARIM BASIN,CHINA

The reservoir space of the Ordovician dense carbonate in Tahe Oilfield,Tarim Basin,is a complex system mainly composed of one or several large pipeline-shaped cavities communicated by natural and acid-fracturing fractures. The development performance from water breakthrough till flooded of three interconnect wells of TK440, TK449H, and TK424C in Block 4 shows that there exist a number of different invading pathways of edge or/and bottom water bodies,which is different from the common water invading process from lower to higher position gradually. After water flood of these 3 wells, the water injection from well TK440 in the lower-position, the TK424C decreases water production and well TK449H produce no water but pure oil. According to the relationship between water and oil during the development process, it have been established a reservoir conceptual model and a new model of controlling water coning by water injection for well group TK440. These models reveal that water injection from lower-position may increase the energy of remaining oil in the upper drowned wells from the reverse direction of the original inva-ding pathway, result to water containing drop and control water coning in upper wells.