Research On Testing Technology Of Dynamic Pressure In Perforating Gun

The shale gas well in the recent shale gas revolution, originated in the United States,swept the global. The traditional Oil, coal bed methane Wells. In the process of theirproduction, shaped perforation is an extremely important step. The huge demand for energy inthe world economy, the reality of energy in short supply is a pair of sharp contradiction. Tosolve the contradiction, the reservoir stratum which is deeper and richer must be taken intoaccount. This needs the support of drilling technology. The dynamic pressure whenPerforating, especially the high frequency dynamic pressure in perforating gun are importantreference basis for evaluation of fracturing effect, complex geological information, oil and gaswell production capacity and life. So this article puts forward inner gun dynamic pressuretesting technology,research on the characteristics of inner gun dynamic pressure, and thedesign method of downhole testing instrument.In this paper, the analysis of high frequency pressure, the design of pressuremeasurement system are based on theoretical analysis, numerical simulation, experimentaldemonstration. The details are as follows.1. This study briefly introduced the principle of jet formation and reservoir stratumfracturing when perforating, the formation of high frequency dynamic pressure. The analysisof annulus pressure data gives out the conclusion that annulus pressure and pressure inperforating gun have common properties. This conclusion provides some theoretical basis forthe design of testing instruments.2. Coping with the limited and harsh downhole situation, the high frequencycharacteristics of gun inner pressure, this paper comes up with the design ideas and solutionsfor pressure test instrument. These ideas and solutions have analyzed software algorithm andhardware structure in detail, introduced embedded FPGA intellectual property cores, analogand digital dynamic compensation method. the system become highly intelligent andintegrated, hardware resources and power consumption are saved,the service time andreliability are prolonged and improved. The dynamic testing precision is ensured by all these above.3. Asimplified numerical model is made to simulate physical and chemical changes ofvarious environmental factors. Shaped charge and Shaped charge jet theories both contributeto the numerical model. The simulation cloud can intuitively demonstrate. The relationshipbetween downhole pressure and actual downhole situation can be established by comparingannulus pressure data and gun inner pressure data. The annulus pressure data came fromactual downhole test. The gun inner data came from calibration simulation environment.