Annular preventer with internally-arranged circulating water cooling system

Abstract

The invention relates to oil field and gas field oil extracting and gas extracting equipment manufacturing. Innovative design is carried out in terms of well opening sealing and safety protection mechanisms, and the problems that high gas extraction temperature makes the stickness of hydraulic oil in an annular preventer descend when the temperature of the hydraulic oil is higher than the rated functioning temperature of the hydraulic oil, leakage is generated, and pressure is reduced are solved. A circulating water cooling system with a low-water-level inlet and a high-water-level outlet is arranged in the annular preventer body to achieve water circulation and reduce the temperature of the preventer. The annular preventer has the advantages of being exquisite and compact in structure, good in heat absorbing effect and capable of guaranteeing normal work of the hydraulic oil under the rated functioning temperature, prolonging the service life of a rubber core, being capable of being flexibly and reliably closed and eliminating potential accident hazards caused by high temperature.

Description

Technical field [0001] The invention relates to oil and gas production equipment for oil and gas fields, and in particular to an annular blowout preventer with built-in circulating water cooling. The annular blowout preventer is an indispensable transition device when shutting in a well to seal various shapes and sizes. The drill pipe, drill pipe joints, drill collars, casing and other tools can fully seal the wellhead for a short time when there is no drilling tool in the well. The annular blowout preventer is an important wellhead safety device for uphole operations and replacement of downhole tools. Background technique [0002] In the process of gas production, the annular blowout preventer is normally open. There is a gas pipeline passing through the vertical passage of the body. The annular blowout preventer has a built-in piston and rubber core. The piston relies on hydraulic oil with appropriate viscosity to provide power when working. The rubber core can shrink and defor...

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Problems solved by technology

[0002] During the gas production process, the annular blowout preventer is normally open, and the gas production pipeline passes through the vertical channel of the main body. The annular blowout preventer has a built-in piston and rubber core. The piston is powered by hydraulic oil with an appropriate viscosity. The rubber core can shrink and deform centripetally under the push of the piston, and one kind of rubber core can be used to close the annular spaces of different sizes. The current situation is that when the gas with a high temperature of 300 ° C in the formation passes through the annular blowout preventer, a large amount of heat will be transferred to the blowout preventer body. Keep the main body in a high temperature state, the hydraulic oil driving the piston in the main body will become thinner due to exceeding the rated working temperature, and the viscosity will drop, not only will it leak, but also will cause a depressurization phenomenon. In this way, once the high pressure in the formation produces well kick and blowout accidents, it is required to be shut down immediately In the case of annular BOP, the piston action will be sluggish or even malfunction due to leakage or pressure drop, which cannot drive the rubber core to contract centripetally, making the annular BOP invalid. At the same time, the high temperature also makes the rubber core easy to age, and there is a great potential for accidents in the entire production

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