| Of late years,with the requirement of the oil field exploration and development,a new kindof perforation technique—complex-perforation technique is widely spreaded and used,Thetechnique can reform the structure of layer,enlarge the layer crack,improve the single wellyield,and require less investment and yield quick results,the technique is widely used as maintechnicial method to increase the production of crude oil.But in the perforating process,onaccount of the structure of complex-perforator is more different than the common one,and underthe influence of the crush-powder,the gun will be split and broken easily after the lighted chargeis shoot,which will cause that the gun is blocked and falled in the well,affect the oil experimentand bring unnecessary loss.So it is important for us to analyse and calculate the force conditionof the complex-perforation in perforating process and to evaluate its security.This paper introduces the complex-perforation technique and complex-perforator throughanalysing the structure,dissolve movement force and calculate the static strength of thecomplex-perforator in the process,and through experiment combined togother with theorystudy,the law of pressure is researched.By the means of selecting suitable security evalution,the static strength of complex-perforator is evaluated.The paper mainly includes the substances are as follows:(1) Researching the complex-perforator structure.(2) Analysing movement force and calculate the static strength of the complex-perforator inthe process,together with mechenics analyzing,the gun's streghth calculation formule isintroduced and the screw tooth streghth calculation method is improved.(3) Researching the law of pressure in the well.Through experiment combined togotherwith theory study,the law of pressure is researched.(4) Analysing and comparing all kinds of security evaluation methods,by the means ofselecting risk security evalution,the strength of complex-perforator is evaluated.
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