苏里格气田致密砂岩气藏储层体积改造关键问题及展望

2012年,中国石油天然气股份有限公司提出了"体积改造"的技术理念,促使压裂理论从经典走向现代。随着鄂尔多斯盆地苏里格气田致密砂岩气藏勘探开发工作的持续推进,储层条件更加复杂,压裂改造技术在理念、材料和工艺等多方面都面临着新的难题和挑战。为了将体积改造技术原理的普遍性和苏里格气田致密砂岩气藏储层的特殊性相结合,建立有效的体积改造技术模式,借鉴近年来美国非常规天然气成功开发的经验,从地质特征入手,探讨了苏里格气田致密砂岩气藏储层体积改造面临的关键问题,并提出了技术发展的方向。研究结果表明:(1)控制裂缝纵向延伸,适度提高排量、大幅增加液量的滑溜水压裂设计是提高单层产量的关键;(2)通过直井多层、水平井多段压裂,实现致密砂岩气多层系立体式开发,是提高单井产量和采收率的基础;(3)小井眼、小油管完井实现高排量压裂设计、长期生产,是实现提产降本的前提。

Volumetric stimulation of tight sand gas reservoirs in the Sulige Gas Field,Ordos Basin: Key issues and prospects

In 2012, the concept of Volumetric Stimulation was presented by PetroChina to promote the fracturing theory from classic to modern. Along with the sustainable exploration and development of tight sandstone gas reservoirs in the Sulige Gas Field, Ordos Basin, the reservoir conditions are getting more and more complicated, new difficulties and challenges have been encountered in fracturing stimulation technologies from the aspects of ideas, materials, technical processes, and so on. The following conclusions were obtIn 2012, the concept of Volumetric Stimulation was presented by PetroChina to promote the fracturing theory from classic to modern. Along with the sustainable exploration and development of tight sandstone gas reservoirs in the Sulige Gas Field, Ordos Basin, the reservoir conditions are getting more and more complicated, new difficulties and challenges have been encountered in fracturing stimulation technologies from the aspects of ideas, materials, technical processes, and so on. The following conclusions were obtained. First, to control fractures extension vertically, enhance the discharge volume, and make a slickwater fracturing design with a significant increase of liquid quantity will be the key to the improvement of single layer gas production rate. Then, to achieve a stereometric development mode for multi-layer tight gas reservoirs fractured by vertical wells with multiple layers, horizontal wells with multiple sections is a robust foundation for improving single-well production and gas recovery rates. Finally, it is the prerequisite to lowering costs and increasing production rates to achieve a favorable fracturing design with high discharge volumes and long-term stable production rates by well completion with small holes and small-size oil tubings.ained. First, to control fractures extension vertically, enhance the discharge volume, and make a slickwater fracturing design with a significant increase of liquid quantity will be the key to the improvement of single layer gas production rate. Then, to achieve a stereometric development mode for multi-layer tight gas reservoirs fractured by vertical wells with multiple layers, horizontal wells with multiple sections is a robust foundation for improving single-well production and gas recovery rates. Finally, it is the prerequisite to lowering costs and increasing production rates to achieve a favorable fracturing design with high discharge volumes and long-term stable production rates by well completion with small holes and small-size oil tubings.