Research And Realization For The Productization Of Well-ground ERT Water Flooding Front And Fractured Fissure Tomography Transmitter

With the rapid development in economy in our country, demands for crude oil,petroleum products and liquefied petroleum gas have increased substantially, which inthe mean time has led to an increase in oil import dependence. Hence, our priority haslay in avoiding the risk of oil price volatility and ensuring the safety of oil supply in ourcountry. Most of oil fields in our country have entered middle-late stage of exploitation.Underground water injection turns out to be the most effective approach to maintain theformation energy, enhance oil recovery and realize stabilized production.Well-ground ERT (Electrical Resistance Tomography) technology has beengenerally applied to the detection of residual oil. The working process start withemission of high-power current towards down hole, then measure the potentialdistribution of underground medium, finally, investigate the resistivity profile ofunderground medium. Well-ground ERT technology has multiple advantages such aseasy achievement of field source, simple and convenient operation, none damage to worksite, high resolution, greater penetration depth and lower cost, etc. This paper focuses onthe productization of well-ground ERT transmitter and has verified the performance ofthe transmitter.Power transmission circuit is the core component of the transmitter, detailedresearch has been carried out in this research. Productization is the predominant design.We created a inverter bridge circuit after the input of direct current, select the appropriatehigh power IGBTs according the launching current and the calculation of relatedparameters and finish the design of bridge absorption circuit and IGBT drive circuit.Considering the adverse circumstances of the out field working scenarios, detailedcalculations and designs are specified for the cooling system of the bridge circuit.The productization of fabrication structure is primarily devised. We use draw-outtype structure to divide the system into3modules. We create signal generation modulesby adopting the plot comprised with MSP430and FPGA, and integrate the power supply of the low voltage part to form a new power module, finally use a morehumanized peripheral to make the human-computer interaction modules. Pseudo randomcoding techniques are employed in the new transmitter which have greatly enhanced theantijamming capability and working efficiency.The overall design and assembling of the transmitter are of great importance forgeophysical detecting instrument. Filed work will always encounter emergencies andsevere environment. The packing and overall structural design are vital for a matureproductization instrument including faceplate design, internal structure design and boxbody design,etc.We have examined and improved the experimental apparatus for several timesthrough field experiments in Daqing oil field, Fuxian oil field in Shanxi, Liaohe oil field,Shenyang oil production plant and Yankuang Group Co., Ltd. in Xinjiang. Analysis ofthe experimental results have proved the performance of the transmitter, and brought outthe possible refinement.