Metal sealing device for horizontal type oil extraction wellhead system

Abstract

The invention discloses a metal sealing device for a horizontal type oil extraction wellhead system. The metal sealing device comprises a wellhead, a metal sealing ring and through holes, thread grooves are formed in the surface of the top edge of the wellhead, a different-diameter connector is arranged above the wellhead, wherein the edge of the different-diameter connector is connected with locking bolts in a penetrating mode, the locking bolts are connected with the thread grooves of the top of the wellhead, abutting grooves are formed in the inner side, in butt joint with the different-diameter connector, of the wellhead, the metal sealing ring is arranged in the wellhead and the different-diameter connector, and the through holes are formed in the surfaces of loops in a penetrating mode. According to the metal sealing device for the horizontal type oil extraction wellhead system, when pressure is generated in the wellhead, the metal sealing ring is extruded outwards under pressure, so that the metal sealing ring is correspondingly and closely compressed with the wellhead and the inner wall edge of the different-diameter connector through the surface with the two outer side ends of 19 degrees, a pressure sealing-assisting effect is conveniently realized on the device through the metal sealing ring, and thus the sealing effect of the device is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas wellhead sealing, in particular to a metal sealing device for a horizontal oil production wellhead system. Background technique [0002] According to API 6A "Specifications for Wellhead Devices and Christmas Tree Equipment", for oil production or gas production wellheads, a reliable sealing connection between carriers is required during installation operations. At present, the connection between the wellhead (oil, casing head) adopts API standard backing ring, such as figure 1 shown. The gasket groove, bolt specification and quantity, and tightening torque of the wellhead connection flange must be implemented in accordance with API requirements. The API standard wellhead flange has a large size, requires a large number of bolts, and requires a large tightening torque. It cannot meet the space and time saving requirements of offshore platforms, especially the horizontal oil production wellhe...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a metal sealing device for a horizontal oil production wellhead system to solve the problem that the metal sealing device for a horizontal oil production wellhead system on the market is not convenient for the positioning and installation of the metal seal ring proposed by the above-mentioned background technology. The metal sealing device is not easy to lock and fix, and the metal sealing device of the horizontal oil production wellhead system has poor sealing effect under pressure

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