An emergency release device and method with a tie-back function

Abstract

The invention discloses an emergency release device and a method with a return connection function. The emergency release sealing device includes an emergency release joint, a power system, and a well sealing joint; the emergency release joint includes an emergency release male head and an emergency joint female head, and the emergency release male head is connected to the power system through an upper power pipeline. connected, the sealing joint is connected to the power system through the lower power pipeline; in the case of emergency release, the upper workover riser is lifted upwards to separate the emergency release male head from the emergency release female head. When the upper power pipeline is disconnected from the power system, power fluid is provided to the sealing joint through the lower power pipeline to trigger the well sealing action. The invention can be used not only on a conventional drilling operation ship, but also on an engineering ship, has strong adaptability, flexible and convenient operation, and can be widely used in workover operations of deep-water oil and gas fields adopting an underwater wellhead development mode.

Description

technical field [0001] The invention relates to an emergency release device and method with a tie-back function, and belongs to the technical field of workover in the underwater wellhead mode of offshore oil and gas fields. Background technique [0002] For oil and gas wells developed in the subsea wellhead mode, it is generally necessary to use a workover riser to establish a circulation channel between the floating drilling operation vessel and the subsea wellhead during the workover process. Due to the risk of positioning failure of the floating drilling operation vessel in emergencies such as typhoons and internal waves, the drilling operation vessel deviates from the safe operating range, and serious accidents such as breakage of the workover riser or damage to the underwater wellhead occur. An emergency release device is installed in the workover string to realize the emergency release of the workover riser and the wellhead, so as to ensure the safety of the workover r...

AI Technical Summary

Problems solved by technology

Although this method can effectively realize the release function, the control logic and the equipment involved are complicated, and the requirements for the carrying capacity and deck space of the drilling operation ship are relatively high, and the workload of the tie-back after release is increased, and the operation efficiency is low.

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