An underwater wellhead emergency release sealing device and method for deepwater drilling

Abstract

The invention discloses a wellhead emergency releasing and sealing device and method for deep water drilling. The underwater wellhead emergency release and sealing device includes a blowout preventer and an emergency release device; the blowout preventer is connected to the underwater wellhead through a wellhead connector; the emergency release device includes a matching emergency release joint female buckle and emergency release joint male buckle ;Blowout preventer is connected with the emergency release joint female buckle, and emergency release joint male buckle is connected with the riser; under the emergency release condition, lift the riser, and under the action of the lifting force, the emergency release joint female buckle and the emergency release joint male buckle Disengagement means that the riser is freed from the underwater wellhead, and at the same time, the hydraulic control blowout preventer is used to close the ram to seal the well. The underwater wellhead emergency releasing and sealing device for deepwater drilling of the present invention can be used for both conventional drilling operation ships and engineering ships, has strong adaptability, flexible and convenient operation, and can be widely applied to deepwater wellhead development mode using underwater wellheads. Drilling, completion and workover operations in oil and gas fields.

Description

technical field [0001] The invention relates to an underwater wellhead emergency release sealing device and method for deepwater drilling, and belongs to the technical field of underwater wellhead mode drilling, well completion and well workover in offshore oil and gas fields. Background technique [0002] Subsea wellheads are commonly used equipment for the development of offshore oil and gas fields. Oil and gas wells developed using the subsea wellhead mode generally need to use risers to establish circulation channels between the floating drilling operation ship and the underwater wellhead during drilling, completion and workover. Due to the risk of positioning failure of the floating drilling operation ship in emergency situations, if the positioning fails and the drilling operation ship continues to deviate from the underwater wellhead, it may cause a large stress load on the underwater wellhead, or even damage it. Therefore, it is necessary to In an emergency situation...

AI Technical Summary

Problems solved by technology

Conventional emergency well sealing devices include blowout preventers, electro-hydraulic control boxes, control umbilicals, umbilical drums and other large equipment. To trigger the emergency release function, it is necessary to transmit electric or hydraulic signals from the platform to the execution near the underwater wellhead through the control umbilical. This method is effective, but the structure is complex, the control logic and control system equipment are complex, and the requirements for the carrying capacity and deck space of the drilling operation ship are relatively high, and the control umbilical generally needs to be followed Riser installed together, affecting the efficiency of the installation of the riser

Images