Key technologies and suggestions for horizontal well fracturing in tight oil reservoirs of Daqing Oilfield
Tight oil reservoirs in Daqing Oilfield have the characteristics of discontinuous transverse develop-ment,strong heterogeneity,lack of natural fractures and multiple thin layers in longitudinal development.With the goal of"increasing oil production,reducing cost and improving efficiency",the method of combi-ning laboratory experiment,numerical simulation and field test is adopted.The key technologies for volu-metric fracturing of tight oil horizontal wells have been developed,with the core of"close cutting in plane and longitudinal cross-layer fracturing to increase production,variable viscous slippery water carrying sand cost reduction,temporary plugging in the section,soluble bridge plug and coiled tubing hydraulic injection technologies".A comprehensive analysis is conducted on the challenges faced by tight oil reservoir stimula-tion technology in three aspects:the benefit construction of Class Ⅱ reservoirs,the improvement of old-well efficiency,and the improvement of productive systems.Three key technical proposals for tight oil frac-turing are put forward:① Continue to develop fracturing technology for horizontal wells in Class Ⅱ reser-voirs;② Tackle key problems to improve fracturing and energy enhancement technology;③ Improve rea-sonable backflow and productive system.The research on these key technologies is meaningful for the eco-nomic and efficient development of tight oil reservoirs in Daqing Oilfield.
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