The Design And Research Of Oil-gas Well Perforating Fracturing Pressure Test System

Electronic pressure gauge with its advantages of high precision, intelligent and goodflexibility gradually replace the mechanical pressure gauge in the position of the oil pressuretest in the field of oil and coal-bed methane. Electronic pressure gauge provides the datasupport for the research of oil-gas well fracturing perforating dynamic parameter and theoptimization of perforation process. It not only help to perfect the gas cracking mechanism,but also improve the energy production. Based on the present situation of electronic pressuregauge at home and abroad, it is a long-term demand to develop a kind of low cost, highreliability and good environmental adaptability of oil-gas well perforating fracturing testequipment. It is of great importance in the development of energy economy and dynamictesting research.Under the storage test theory, this article carried out the design and research of oil-gaswell perforating fracturing pressure test system. The main contents are as follows.(1)Combined with test environment factors and the motion law of the testing instrument, wedesign the system working status and system sampling strategy. From the Angle of analogcircuits and digital circuits, we analyzed the key technology and some problems that shouldbe paid attention to in the process of design.(2) From the perspective of hardwareimplementation, we designed the system hardware structure and the analog gain and offset.Due to the complexity of signal in the process of testing and the limitation of storagecapacity, combined the negative delay technology, we proposed a variable frequencysampling method.(3) Because of the disadvantages of absolute pressure trigger in practicaltesting tasks, we added servo trigger method based on instantaneous pressure rising rate.Two trigger modes can be selected based on the actual test. This design improves the test instrument’s ability to adapt the diversification process. Combining with the systemenvironment, we study the testing system’s low power design and impact reinforcementtechnology.(4) In order to eliminate the environment error, we adopt the calibration theoryand technology based on simulative environment, and analyzed the necessity and rationalityof calibration based on simulative environment. Dynamic calibration based on simulative oilwell not only improve test accuracy greatly, the reliability of the test system is also verified.In addition, we also studied the temperature effect correction method based on the simulativeenvironment.(5) Because of the lack of the quantitative research about the reliability ofoil-gas wells pressure test system, we analyzed the system failure mode combining thereliability theory, designed the system reliability test. The reliability prediction of test systemis finally calculated which has a certain practical reference value for further research.