控水压裂技术在温米油田的研究与应用

STUDY AND APPLICATION OF THE WATER-CONTROLLING FRACTURING TECHNOLOGY IN WENMI OILFIELD

吐哈温米油田属于低孔、低压、低渗油藏,经过多年高速开采,部分区块处于高含水开发阶段,层内、层间和井间矛盾突出,平面上油井距水驱前缘距离减少,纵向上水淹层与油层交错存在,裂缝前端容易沟通注水前缘,导致压后高含水增液不增油,另一方面缝高失控压窜上下水层或层内底水,导致压后高含水,严重影响了油田的开发效果。文章从控水压裂机理入手,开展了控水压裂工艺技术对策研究,形成了低排量、多段塞、相渗改变技术、低伤害压裂液体系等配套技术,在现场成功应用9井次,有效率88.9%,取得了较好的效果,为油田的高效开发提供了技术思路。

Wenmi reservoirs are characterized by low porosity,low permeability and low pressure. After the high speed production for last several years,some blocks of Wenmi reservoirs are now at the high water cut stage. At the stage,there were many problems of intrastrata,interbeds and interwells,such as the planar distance between oil well and waterflood front shortened,and vertically water flood reservoirs and oil reservoirs existed crossedly. The complicated situation could cause the fractures meet the water flood front readily and produce more fluid but no more oil after fracturing. And more,the height of the fracture was not easily controlled,which could extend into the nearby water reservoirs and improve the water content after fracturing,and would seriously influence the oil production effect. Based on the mechanism of water-controlling fracturing,the water-controlling fracturing technology was studied,which included low discharging,multi-slug,phase permeability alternation,low damage fracturing fluid etc. The water-controlling fracturing technology has been used in 9 wells with 88.9% effectiveness,which has been proved that it provided a better method for high-efficient development reservoir than before.