High-power signal emission source and monitoring method for dynamic monitoring of remaining oil in oilfield by potentiometric method

Abstract

The invention relates to a signal emission source and a monitoring method for dynamic monitoring of remaining oil in an oilfield by potentiometric method. A generator set provides 30KW 50Hz three-phase alternating current to a main control unit. The main control unit is composed of a GPS timing synchronization module, a radio synchronization module and a wire-controlled The synchronization module is connected with the square wave output unit through the synchronous control circuit control unit and the voltage regulation circuit unit, the voltage regulation circuit unit is connected with the A / D acquisition unit through the current acquisition unit, and the generator set is connected with the voltage regulation circuit unit. The use of GPS, high-frequency radio and wire-controlled trigger mode is convenient for users to choose according to the actual test situation, especially the radio synchronization mode can effectively avoid the problems caused by GPS being affected by the external environment, and realize the remote control of the main control unit; Signal synchronous output is realized through three synchronization methods of GPS timing synchronization, radio synchronization and wire-controlled synchronization set in the main control unit. It has the advantages of small size, light weight, low cost and convenient construction.

Description

technical field [0001] The invention relates to a ground potential measurement method and a monitoring method, in particular to a high-power signal emission source suitable for potential measurement under complex test environments such as high background electric noise and a method for dynamically monitoring remaining oil in an oil field. Background technique: [0002] Petroleum is a non-renewable energy, and oil recovery is not only a concern of the petroleum industry, but also the whole society. Oil extraction is divided into three stages. Primary oil recovery relies on formation energy for self-spray production, and its output accounts for about 15% to 20% of the total reserves. After the formation energy is released, artificial water injection or gas injection is used to supplement the energy of the reservoir, so that the crude oil can be continuously extracted, which is called secondary oil recovery. The recovery rate of secondary oil recovery is 15% to 20%. After se...

AI Technical Summary

Problems solved by technology

After several decades of secondary oil recovery, the remaining oil is trapped in the sandstone pores in the form of discontinuous oil blocks. At this time, the water content of the produced fluid reaches 85% to 90%, and some even reach 98%. Mining is no longer economical

[0004] At present, the existing measuring instrument system has been developed from the original single-channel point-by-point measurement method to the multi-channel area measurement method, which makes the technology comprehensively improved in background noise suppression, test efficiency, especially dynamic monitoring, etc., but this The signal source that the method relies on generally has shortcomings such as low transmission power, single frequency, and single synchronization method, which cannot fully meet the requirements of the potential method for the signal source in the dynamic monitoring of remaining oil in oilfields.

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