Embedded sealing and isolating sealed casing head

Abstract

The invention discloses an embedded sealing and isolating sealed casing head, comprising a base assembly, a slips hanger, two rubber seal rings, two grease injection valves, two flat gate valves, a pressure gauge stop valve assembly, a pressure gauge, a metal sealed hanger, a casing head body, two threaded flanges, a pipe plug joint, two drain plugs, an oil-string casing, and an intermediate casing. The casing head is advantaged by low switching moment. A balancing pole on the tail of a valve can make operation of the valve portable and flexible in high-pressure load, and integrated sealing property of the casing head is ensured. All sealing backing rings and hanger sealing components use metal sealing, and the annular space of the casing is preferably sealed, and changing fittings is more convenient and easy.

Description

Technical field [0001] The invention relates to a casing head for a gas injection and oil production wellhead for petroleum machinery used in oil fields, in particular to an embedded packing and sealing casing head. Background technique [0002] The hanger of the existing casing head device is mainly composed of a hanger body and a metal sealing component. This traditional structural design can still be used normally in oil production and water injection operations, but gas injection operations require higher product specifications and performance levels, and the structural design of ordinary casing head devices will greatly reduce the safety factor during work. According to the data from the oilfield, the existing casing head device is injecting CO downhole 2 CO often occurs in gas operations 2 Gas leakage, once the leakage occurs, the bottom hole pressure can only be released according to the existing technical conditions, causing very serious consequences. First, it emits a ...

AI Technical Summary

Problems solved by technology

This traditional structural design can still be used normally in oil recovery and water injection operations, but gas injection operations have higher requirements on product specification levels and performance levels, and the structural design of ordinary casing head devices will greatly reduce the safety factor during work

According to the data fed back from the oil field, the existing casing head device is injecting CO downhole. 2 CO often occurs in gas operations 2 Gas leakage, once a leakage occurs, according to the existing technical conditions, only the bottomhole pressure can be released, causing very serious consequences

First, the emission of a large amount of high-density CO 2 The gas enters the air, affecting the natural ecological environment and at the same time affecting the daily life of the surrounding people; second, the leakage of the casing head poses a great threat to the life safety of the workers on site, and the CO injected underground 2 The gas is low-temperature liquid, even if it goes to the well, the temperature is below -40°C, and the working pressure is above 20MPa, so once a sudden leak occurs, it is very dangerous to spray on the workers; third, once a leak occurs The accident involved post-maintenance. Most of the oilfield equipment is composed of huge steel mechanical structures. Once repaired, it will involve moving a large number of mechanized equipment. This requires a lot of human resources and wastes a lot of energy such as water resources and electricity. Wait

In summary, the ordinary casing head device has low safety factor, easy to cause environmental pollution, and waste energy during the gas injection operation, so it can no longer better meet the needs of the times

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