Fracturing Mechanism of Difficult-to-Fracture Thin Poor Reservoir Layers and Controlling Measure
It was used for development target of supplementary layers of production for the thin and poor reservoir layer, and it was considered as difficult-to-fracture layer as high calcium content and compact cementation, the emphasis was focused on study and application of fracturing technology in Daqing oilfield in this paper. The rock which was difficult to fracture had the characteristics of high density, high strength and impermeability, so it was difficult for the fracturing fluid to enter the formation. Therefore, it should firstly to overcome the wellbore stress concentration and when the fracture pressure was higher than thirty-seven MPa. The acidification treatment was used as the method of layer modification, through the method, the cementation among the rocks was destroyed and the tensile stress of the rock was decreased; the permeability near the well bore was increased and then, the fracture pressure would be decreased. For the section which had large difference value of fracturing pressure, rational design of sand volume in single slit should be by forecasting difference value of fracturing pressure. The single slit emission should to be higher than 0.5 m3/min, and then it can ensure the normal construction under the conditions of present construction scale and adding sand program conditions.
Difficult-to-fracture thin layer Fracture Pressure Depressurization Modification Daqing oilfield
Shengguang ZHUO Youcai ZHANG Juanxia ZHANG Junxia MA Yumei WANG Jiandong Liu Luhe Shen
Northeastern University at Qinhuangdao, Qinhuangdao, 066004,China Daqing Oilfield Downhole Operation CompanyDaqing,163453,China Beijing 3Gland Petroleum Technology Co.,Ltd.,Beijing,100107,China Research Institute of Petroleum Exploration and Development, PetroChina,Beijing,China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
474-481
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）