The Deep Study Of Shaped Charge Jet And Penetration Under The New Shaped Charge Structure

The national economy continues to develop in the 21st century,oil as the main driving force for economic development,China faces severe challenges in oil development with the increasing demand for petroleum resources from all over the world.Oil well perforation is a key technology in oil exploration and production.The advantages and disadvantages of shaped energy perforating technology have an important impact on the production of oil and gas wells.The core of the concentrating perforating technology is to detonate by explosives,and the detonation wave acts on the hood to form a condensing jet,wh ich finally opens the oil and gas passage.The drug cover is one of the most important parts of the formation of shaped energy jets,and it has been regarded as an important research content over the years.The material properties,geometry,size and processing options of th e hood have a very significant effect on the ability of the shaped jet to penetrate and the length,density and speed of the jet.Therefore,studying the structure of the blister cover has important practical significance for the formation and penetration performance of the shaped charge jet,which can more effectively solve the problems in China's oil exploitation and promote the development of China's petroleum economy.In this paper,the combination of theoretical analysis and numerical simulation is used.Starting from the principle of energy-concentration effect,combined with the basic theory of shaped energy jet forming and penetration,the advantages and disadvantages of existing shaped energy perforating technology are summarized and a new improved model is proposed.The structure of the drug cover was verified by the numerical calculation method.The diameter of the auxiliary cover,the thickness,the material,the size of the cover,the thickness,the material and other factors were studied.The penetration ability of the new type of hood to the concrete target was studied and the influence of the height on the pe.netration ability was analyzed.The main research work can be summarized as follows:(1)Starting from the principle of energy accumulation effect,the basic theory of shaped charge jet forming and penetration is analyzed and summarized.Combined with numerical simulation method,the shaped jet process formed by the traditional single-conical hood structure and the double-conical hood structure is carried out.Comparative analysis showed that the shape of the shaped energy jet formed by the double-conical hood was small,the stretching was long,and the head speed was high,but the fracture during the jet formation process was serious,which affected the shaped jet effect.(2)In order to optimize the effect of shaped energy jet,a new type of blister structure with auxiliary hood is added to the double-cone type hood structure,and the condensing jet formed by the new hood structure is calculated by numerical calculation method.In order to further improve the effect of the shaped jet under the new type of cover,the influences of the diameter,thickness,material and the size of the cone,thickness and material of the auxiliary cover were studied,which affected the structure of the new type of cover.The results show that the speed and tensile length of the shaped jet under the new type of hood are improved,and the fracture condition is improved.With the increase of the diameter of the auxiliary hood,the end velocity of the shaped jet is continuously increased,but the increase is increased.Slower,the tensile fracture at the end of the jet also increases;the increase in the thickness of the auxiliary coating is conducive to the formation of the shaped jet,but there is a critical value;with the increase of the density of the auxiliary coating,the energy The maximum velocity of the jet end is increased,and the jet length is increased.When the small cone angle a of the coating cover is 40° and the large cone angle ? is 110°,the shaped jet effect is better.For the equal wall thickness coating,the thickness of the shaped hood is increased and the speed of the shaped jet are reduced.Compared with the equal-wall thick hood,the thin-walled,thick-bottomed thick-walled thick-type hood has better condensing jet effect;With the increase of the density of the hood,the maximum velocity of the shaped end of the shaped jet is smaller,the jet length is shorter,the maximum drop ratio of the end velocity gradient is reduced,and the jet is not easily broken.For the double-layer hood structure,reasonable The combination of the inner and outer coatings can not only mention high jet velocity and solves the problem of low utilization of single-layer hoods.(3)The numerical simulation method was used to simulate the penetration of the optimized new type of hood structure into the concrete,and the influence of the height of the blast on the penetration performance was further calculated.The results show that the optimized new type of hood has better penetrating performance,the average pore diameter of the penetrating concrete target decreases with the increase of the height of the bombardment,and the penetration depth increases with the increase of the bombing height,but the existence is the most The premium is high,and after the bombing height,the maximum penetration depth decreases as the bombing height increases.