The Design Of Perforating Pressure Acquisition And Transmission System On Oil Down-hole

According to the Institute of China Oilfield "pressure collection on perforatingintelligent" project needs, and domestic storage of oil fields, which oilfield reservoir segmentuneven, need multiple perforating operations. Put forward the new requirements for the P-Ttest instrument, which should include the collection and transmission functions.At present, in the field of downhole dynamic test, most of the testing tools is the kind ofmemory tester, you need to return to the ground reading, can not be transmitted directlyreading, can not meet the needs of the diversified perforating, which have a certain lag. Inorder to solve this problem, use of single-core cable as communication channel carrier todesign this system, to achieve the downhole pressure tester can be real-time parametersettings, data acquisition and reading. Provide accurate downhole the live pressure on theenvironment, which provide the basis for the underground others operating environment to setthe instrument parameter, is of great significance to the development of the perforatedcompletion process. The system article based on the laboratory for many years engaged in thethe downhole dynamic environment test, using the theory of signal transmission and dynamictesting as a guide, respectively, on the ground systems and downhole system hardware andsoftware design. Articles design mainly from the following aspects:1. In accordance with the technical background at home and abroad, to develop oildownhole perforating pressure to capture the overall program, developed by the transmissionsystem and the system were analyzed. Combined with the actual situation, developed asystem of technical indicators.2. In order to achieve real-time data transmission, the transmission carrier single-corecable characterization, developed according to the cable itself features a cable simulator, andmakes sure the communication pattern of the system and the corresponding coding standards, and to develop a communication protocol.3. Through the analysis of the transmission channel, independent research anddevelopment laboratory HB-YJ0202chip the master chip transmission part of the hard, thedesign of the software.4. Guaranteed under the premise of the transmission channel, an important part of thesystem perforating pressure acquisition module analysis and design, and the high-temperaturetest on the underground system to verify the reliability of the P-t system.5. The actual analog test system, successfully obtained experimental data to verify thereliability of the test system; and acquisition part is actually well the experimental dataobtained were analyzed.Finally, made a brief description of the progress of the system, and put forward to thenext step.