Through Casing Resistivity Logging Data Transmission And Decoding Technology

Through Casing Resistvity Logging is a new field in Electrical logging. Through casing resistivity logging data transmission system is the through casing resistivity logging in one of the key technologies.Through casing resistivity logging data transmission system consists of underground control panel, underground cable driver board, ground control panel, surface drive plates. In this paper, the cable transmission system to achieve the required functionality described in detail, including ground communication equipment and downhole tools, ground cable transmission system encoding and decoding, downhole power supply, depth reversible counting, ground control computer communication interface.In the analysis of the characteristics of the ground controller system and application request, Proposed based on DSP+CPLD(The system selected AD’s ADSP2189M, Altera Corporation EPM7064) as the main control circuit, to simulate the circuit of the logging cable interface circuit of the system solution. This article first discusses the overall design of the system hardware and software development process, Second, for each functional module and a number of key technology design and development work.Through theoretical analysis, many debug and test results show that the ground data transmission system can control two-way communication with downhole equipment.