The Improvement And Implementation Of Synchronization Technology Of Borehole-surface ERT System

With rapid development of the economy all walks of life in China have more andmore needs for petroleum and its derivatives, which directly leads to the increasingdomestic dependence of imported petroleum. Energy security can not be guaranteedwith excessive foreign-trade dependence for such a long time; meanwhile China’seconomic development will be confined to other countries. Therefore the realizationof self-sufficiency of petroleum has been the giant priority in China.For the sake of the security of petroleum supply, the new oil field should beconstantly explored; the stable yield of old oil field should also be ensured to improvethe recovery efficiency with the exploration of remaining oil distribution.Borehole-surface ERT (Electrical Resistance Tomography) is a mature technique torealize the stable yield of old oil field and explore the remaining oil distribution bymonitoring the fracturing fracture and testing the waterflood front. Thesynchronization scheme designed in this thesis can be applied into the ElectricalResistance Tomography Instrument of the Borehole-surface waterflood front andfracturing fracture utilizing the combined methods of Beidou Satellite Time-serviceTechnology, Local Clock System and Radio Frequency Identification TransmissionTechnology. Beidou Satellite Time-service Technology can guarantee the long-termaccuracy and stability of the time service; the Local Clock System can ensure two orthree hours’ transitory high time-service precision thus Radio FrequencyIdentification Transmission Technology can provide the technological base of datawireless transmission for the future cable-free Borehole-surface ERT system.The whole designed synchronizing system can be divided into transmitter sectionand receiver section. The former is responsible for receiving the time-serviceinformation from Beidou Satellite which can be packed into data frames with the time information and control signal after the disposal. The processed information will besent to the receiver to implement the temporal synchronization. Both sections have thehumanized LED to better visually display the received temporal information andindicate the working condition of the whole synchronizing system.The synchronization scheme designed in this thesis can attain the severalmicrosecond’s difference on the Electrical Resistance Tomography Instrument of theBorehole-surface waterflood front and fracturing fracture, which can ensure the datacollected in the test of the instrument to achieve the comparative level with the similargeology detecting instrument domestic and overseas; meanwhile the revision anddevelopment of this synchronizing scheme have also been put forward in this thesis.