河南老区稀油压裂挖潜技术研究

Technical research of fracturing tapping potential in old light oil reservoirs of Henan oilfield

随着区块采出程度的提高,河南油田压裂改造的对象由大厚层转向中低渗透薄互层,薄互层主要分布在双河油田Ⅵ-Ⅸ、下二门下层系、B304井区部分井层、王集油田、井楼八区等,总计剩余储量超过1000×104t,压裂挖潜潜力较大。薄互层压裂面临着缝高失控压窜邻近水层、供油能力有限、改造程度较低导致压裂效果差等诸多难题,针对不同的薄互层特点,研究了薄互层压裂挖潜综合技术,形成了老油田压裂改造系列特色技术,保证了河南稀油老区的压裂效果,为河南油田薄互层的措施稳产提供了有力的技术支撑。

With the enhanced degree of oil recovery, the fracturing objective transformed from thick layers to thin interbedded layers with middle-low permeability, which are mainly distributed in VI-IX of Shuanghe oilfield, lower series of Xia'ermen, part of layers in B304 well, Wangji oilfield, Jinglou 8 area, etc. the remaining reserves of which is high up to 1 000×104t, with a good tapping potential of fracturing. However, the fracturing of interbedded layers at present have the problems of big fracturing height, near to water layers, limited oil supply capacity and low degree of transformed effect. In accordance with different characteristics of interbedded layers, the technical research of fracturing tapping potential in old light oil reservoirs has been studied and the special technology that suitable for it has been formed, which ensures the fracturing effect and therefore provides technical support for stable production of interbedded layers of Henan oilfield.