苏里格东区致密砂岩气藏压裂技术研究

The fracturing technology research of tight sandstone gas reservoirs in the eastern of sulige gas field

苏里格东区气田上古砂岩气藏属于致密砂岩气藏,通过对该气田砂岩气藏压裂技术的研究及现场应用效果的分析,形成致密砂岩气藏储层改造的压裂技术,对苏里格东区及整个苏里格气田、乃至其它致密砂岩气藏的开发也具有指导意义。通过对苏里格气田东区上古砂岩气藏储层地质特征分析的基础上,提出了满足该区储层改造的压裂工艺,认为低伤害压裂液技术、多层分层压裂技术、水平井压裂技术是苏里格气田东区储层改造的主要技术。剖析了储层改造的压裂难点,认为储层易伤害、纵向多薄层发育、压裂液返排困难是该区储层改造的主要难点,并针对压裂难点提出了针对性措施,而这些针对措施也正是苏里格东区目前实施应用的关键技术。分析了东区实施的压裂关键技术及现场实施效果,形成了适合东区储层改造的压裂设计优化技术、直井定向井多层分层压裂技术、水平井多段分层压裂技术、低伤害压裂液技术、压裂液快速返排技术等综合技术。

The ancient sandstone gas reservoirs are tight sandstone gas reservoirs.In the eastern of Sulige gas field, through the analysis of the effect fracturing technology research and field applications of the sandstone gas reservoir, the formation of the fracturing technology of the tight sandstone gas reservoirs in the transformation, have guiding significance to the development of the eastern of Sulige gas field and the Sulige gas field, and even of other tight sandstone gas reservoirs.Based on the analysis of Reservoir geology of ancient Tight Sandstone Gas l^eservoirs in the eastern of Sulige gas field, proposed the fracturing technologies to meet transformation of the reservoir, think that the low damage fracturing fluid technology, multi-layered fracturing technology and horizontal well fracturing technology is the main transformation technologies of the reservoir in the eastern of Sulige gas field. Analysis the fracturing difficult on the transformation of the reservoir, think that the reservoir easy to damage,more thin vertical development,the fracturing fluid flowback difficulty is the main difficulties of the transformation in the reservoir area, put forward specific measures to the fracturing difficulties, these measures are the key technologies of the implementation and application In The Eastern Of Sulige Gas Field. Analyzed the key fracturing technologies and the effect of the implementation in the eastern of Sulige gas field, formed the comprehensive technologies, including the optimization techniques of fracturing design,multi-layered fracturing for vertical well and directional well,horizontal well multi-stage stratified Fracturing technology,low damage fracturing fluid technology,flowback technology for fracturing fluid quickly for the transformation suitable of the reservoir in the eastern of Sulige gas filed.