Fracturing test of intensive cutting and fracturing through layers for horizontal wells to increase production and efficiency in tight reservoirs of Daqing oilfield
Fracturing test of intensive cutting and fracturing through layers for horizontal wells to increase production and efficiency in tight reservoirs of Daqing oilfield
Tight oil reservoirs in Daqing Oilfield are continental deposits,mainly developed with Fuyu and Gaotaizi oil layers.Fuyu oil layer has problems of low single well production,low recovery rate and rapid production decline.Meanwhile,the horizontal wells in Fuyu oil layers are generally drilled out.There are 20 wells drilled in a block,of which the average sandstone drilling rate is only 40.7%,and the convention-al fracturing reserves loss is large.Therefore,the production and efficiency increase test of horizontal wells in Daqing tight reservoir is carried out to improve reserves utilization and realize the three-dimensional transformation of the wellbore.With the goal of＂increasing production and efficiency＂,to carry out the op-timization design of＂intensive cutting of drilled reservoir interval&drilling interval perforation fracturing＂,optimize the reservoir interval cluster spacing of 9～10.5 m,with the perforation interval cluster spacing of 20～24 m.According to the standard optimization parameters for tight oil perforation,the position with low gamma value,low stress difference and small interval thickness is optimized.At the same time,pre-pres-sure testing,fracturing diagnosis,and on-site construction control technology are applied to ensure the success rate of layer penetration.The ＂integrated slick water＂fracturing fluid system is optimized to ensure the smooth flow of oil and gas from the matrix to the fracture and from the fracture to the wellbore,greatly reducing reservoir damage and construction costs.
关键词
大庆油田/致密油水平井/提产增效/穿层压裂/压裂试验
Key words
Daqing Oilfield/tight oil horizontal wells/increasing production and efficiency/layer-pene-trating fracturing/fracturing test
维普
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