Electronic coring and selecting transmitter

Abstract

The invention discloses an electronic coring and selecting transmitter, comprising a cable, a torpedo, a soft electrode, a cable head, an electronic circuit and a coring gun. The cable and the soft electrode are connected by the torpedo to form a cable and electrode system; the cable and electrode system is connected with the input end of the electronic circuit by the cable head; the output end of the electronic circuit is connected with the coring gun. Compared with the prior art, the invention has the advantages of simple structure, convenient use, more precise measuring depth of the tracing curve; the operations of gear-shafting, selective transmission, ignition and coring are carried out at the same time; the operation is simple; the labor intensity of the well-measuring worker is reduced and the engineering accidents is reduced.

Description

1. Technical field [0001] The invention relates to a measuring device for borehole coring and borehole coring tracking curve of an open-hole well in an oil field, in particular to an electronic coring selector. 2. Background technology [0002] Over the years, oilfield logging companies have been using mechanical hair selectors for sidewall coring construction, and this hair selector has made contributions to the sidewall coring construction of oil wells. But mechanical hair selector still has following shortcoming or deficiency: [0003] 1. The mechanical hair selector relies on mechanical action to shift gears with poor reliability and inflexibility. [0004] 2. Applicable cable length and well temperature conditions are limited. The longer the cable and the higher the well temperature, the more difficult it is to shift gears, and the gear shift is also limited by the shift voltage supplied. [0005] 3. AC ignition is used, which requires high insulation of the coring g...

AI Technical Summary

Problems solved by technology

[0003] 1. The mechanical hair selector relies on mechanical action to shift gears with poor reliability and inflexibility

[0004] 2. Applicable cable length and well temperature conditions are limited

The longer the cable and the higher the well temperature, the more difficult it is to shift the gear, and the gear selection is also limited by the shift voltage supplied

[0005] 3. AC ignition is used, which requires high insulation of the coring gun

[0006] 4. Independent special coring panel should be used for the selection and ignition. Use the coring panel to perform change operation on the downhole selector. After completing the change operation, press the shift button to reset the underground selector. To change gears, press the ignition button to take coring after changing gears. The operation is cumbersome and requires two people to operate at the same time to complete a work process. Coring on the well wall is relatively long in work cycle, and engineering accidents are prone to occur

[0007] 5. It is very inconvenient to replace the core and large protective cap of the mechanical coring selector, and requires the use of a special coring bridle (the wiring is often broken, and the interface of the bridle is not easy to connect, which affects the coring on the well wall The smooth progress of the work), the effect of this sidewall coring is not good, and it cannot meet the needs of oil and gas field exploration and development.

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