Four-gate continuous coiled tubing packer

Abstract

The invention relates to a four-gate continuous coiled tubing packer. The packer comprises a main casing and a hydraulic cylinder, wherein the inner cavity of the main casing is sequentially providedwith a full sealing device, a shearing device, a suspension device and a semi-sealing device from top to bottom. During sealing, a support and a return spring are closed through gates to support a sealing carrier on the lower end surface of an upper joint to achieve the sealing. During repair, the gates are hydraulically driven to open to move a piston group down and push away the sealing carrierto further press the sealing carrier down and enable the sealing carrier to rotate around a gate rotating shaft, and coiled tubing can be lowered into a well along the upper joint inner cavity. The packer has the advantage that the operation space is expanded since the full seal is of a vertical structure, that is, at least one double wing is removed, the personal injury accident in the operationis greatly reduced, the weight of the whole device is greatly reduced, and the operation difficulty and the processing cost are reduced. The packer is safer and more reliable than the original 4FZ blowout preventer, more convenient to use, lower in processing cost and lighter in weight.

Description

technical field [0001] The invention relates to a coiled tubing sealing device and method, in particular to a coiled tubing sealing device with four rams. Background technique [0002] During the construction of coiled tubing in oil production, the 4FZ blowout preventer, that is, the four-ram blowout preventer, is a safety protection device that must be installed. In this device, the coiled tubing four-ram blowout preventer is Coiled tubing plays a pivotal role in the operation, and it is used to prevent blowout during the coiled tubing operation. Equipped with four ram assemblies, it can realize wellhead without pipe sealing, tubing shearing, tubing suspension, and pipe sealing; it is suitable for high-pressure wellhead and H2S working environment, adopts hydraulic drive, fast response speed, and manual locking, safety factor high. [0003] Among them, the full seal plays the role of safety guarantee when the well is shut down after shearing, and realizes no pipe sealing ...

AI Technical Summary

Problems solved by technology

[0003] Among them, the full seal plays the role of safety guarantee when the well is shut down after shearing, and realizes no pipe sealing at the wellhead. However, in the 4FZ blowout preventer, due to the existing full seal sealing method, a combination of hydraulic and manual is adopted. Because of the mechanical method, it is often used as an alternative when the hydraulic control method is out of control, so it is not commonly used. However, the commonly used hydraulic method often occurs due to the long shutdown time of some wells due to seasonal or Blowout accidents caused by drastic changes in the weather will not only cause serious pollution to the environment, but also cause great harm to people sometimes

[0004] In addition, the semi-seal in the prior art is also called pipe seal. The semi-seal of the original 4FZ blowout preventer is also controlled by hydraulic pressure. The disadvantages of this horizontal double hydraulic cylinder sealing method are: The two half-sealed rams are butted, so their sealing performance is greatly affected by the hydraulic pressure and shape. Therefore, during operation, there are often cases where the half-sealed gate cannot fully restore the sealing performance due to the wear and tear of the sealing part and re-pressurization.

This patent adopts an integral fully-sealed ram, but its driving method is to install a lower ram active chamber on the outside of the blowout preventer, which not only increases the volume of the wellhead device, but also adopts a hydraulic method when sealing the well. Push the lower ram into the elastic valve seat to achieve full sealing. In addition, this structural design is not suitable for the well sealing device for the four-ram blowout preventer dedicated to coiled tubing.

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