Remote automatic core changing and sealing real-time monitoring coiled tubing blowout prevention box

Abstract

The invention relates to a remote automatic core changing and sealing real-time monitoring coiled tubing blowout prevention box. The remote automatic core changing and sealing real-time monitoring coiled tubing blowout prevention box comprises a coaxial driving sliding sleeve, an upper plugging mechanism, a lower plugging mechanism, an in-well fluid plugging mechanism, a stepping servo hollow shaft motor and a wireless electromagnetic wave control system. The upper plugging mechanism and the lower plugging mechanism are installed at the upper end and the lower end of the coaxial driving sliding sleeve correspondingly. The in-well fluid plugging mechanism is installed on the neck of a connecting flange. The wireless electromagnetic wave control system controls the stepping servo hollow shaft motor to achieve ascending and descending of the coaxial driving sliding sleeve in the blowout prevention box. A pressure sensor is installed on the coaxial driving sliding sleeve. The blowout prevention box is connected with a lower wellhead device through the connecting flange. The remote automatic core changing and sealing real-time monitoring coiled tubing blowout prevention box has the beneficial effects that a plugging rubber core is more convenient to maintain and replace; the blowout prevention sealing performance is enhanced by arranging the two plugging structures; real-time monitoring and early warning of abrasion and leakage of the rubber core are achieved; and an automatic plugging mechanism is arranged, and an underground high-pressure fluid return channel can be automatically plugged after a coiled tubing is taken out of a wellhead.

Description

technical field [0001] The invention relates to the field of coiled tubing operations, in particular to a remote automatic core change and sealing real-time monitoring coiled tubing blowout prevention box. Background technique [0002] Because of its advantages and application value such as under-balanced operation under pressure, fast and efficient operation, low damage to the formation, and lower operating costs due to simplified procedures, coiled tubing operations are widely used in the exploration and development of fossil resources. It is playing an increasingly important role, which is embodied in the wide application of coiled tubing operations in oil and gas field workover, drilling, well completion, well logging and other fields, as well as in the field of underground coal gasification. A blowout preventer box must be installed to ensure a good seal between the coiled tubing and the wellhead during operation. After the coiled tubing is taken out of the well, the bl...

AI Technical Summary

Problems solved by technology

The present invention is designed with two sealing structures, the upper sealing structure and the lower sealing structure, which solves the problem of too few sealing structures of the existing coiled tubing blowout prevention box, and can ensure that the coiled tubing operation is under a relatively high working pressure condition. sealing effect

In the present invention, a fluid sealing structure in the well is provided at the connecting flange. When the coiled tubing in the well is taken out and injected into the wellhead device, the fluid sealing structure in the well can block the return passage of the high-temperature and high-pressure fluid remaining in the wellhead device to ensure smooth operation. Safe, solves the problem that the existing coiled tubing blowout preventer does not have this function

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