Case Analysis of Deep Super-high Temperature Perforating Discontinuous Explosion of Bohai Oilfield Well C
As the exploration of Bohai oilfield moves deeper,the frequency of using ultra-high temperature perforation in well testing operations has gradually increased.Due to relatively limited operational experience,Bohai Well C,which employed the ultra-high temperature perforation testing combined operation process,experienced a detonation accident during the operation.To delve into the reasons,a decision tree for detonation cause analysis was established,and a systematic and detailed analysis was conducted from four aspects:explosive quality,perforation equipment,assembly quality control of the perforation gun,and the standardization of the operation for lowering the perforation gun.Finally,it was determined that the structural defect of the perforation gun's cartridge holder was the primary cause,while the possible secondary factor could not exclude the quality control of the assembly personnel for the perforation gun.Based on this,a series of quality control measures for ultra-high temperature perforation operations were developed,including perforation gun assembly,operation specifications for inserting the perforation gun,and operation management,which are of vital guiding significance for future ultra-high temperature perforation operations.
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