Casing head for oil field

Abstract

The invention relates to the technical field of oilfield pipelines, and discloses a casing head for oilfields, including an outer casing, an inner casing is movably sleeved on the inner side of the middle part of the outer casing, and a casing is clamped on the outer side of the top of the outer casing The head body, a first locking structure is provided between the top of the outer casing and the bottom of the casing head body, and a composite disk group is clamped inside the casing head body, and the inner side of the composite disk group And the bottom is clamped on the surface of the inner casing and the inner side of the top of the outer casing respectively. The structure design of the present invention is simple and reasonable, easy to disassemble and assemble, and is suitable for the use of the existing medium and low pressure wells. Furthermore, the first anti-off structure and the anti-off collar tube are respectively used in conjunction with the composite disc group and the casing gland The use effect of double fixing on the casing head body can be realized, the probability of the inner casing sliding down can be reduced to the greatest extent, and the support for the inner casing can be guaranteed, so as to obtain the user's approval, promotion and popularization.

Description

technical field [0001] The invention relates to the technical field of oilfield pipelines, in particular to an oilfield casing head. Background technique [0002] Casing head is a special short joint for installing blowout preventer group and other wellhead devices in order to support and fix the casing string in the well when drilling on land or offshore. The side port can be used for construction operations such as mud squeeze, monitoring and filling of balance fluid. At present, in the high-pressure wells exploited in oil fields, due to the limitation of their pressure bearing capacity, the existing structure is usually complex and huge, and the installation is very difficult. The casing head is particularly expensive, but for some medium and low pressure wells, if the above-mentioned casing head is also used, its use cost will become a burden on benefits, lacks effective pertinence, and is not conducive to extensive promotion and popularization. The application provides...

AI Technical Summary

Problems solved by technology

[0002] Casing head is a special short joint for installing blowout preventer group and other wellhead devices in order to support and fix the casing string in the well when drilling on land or offshore. The side port can be used for construction operations such as mud squeeze, monitoring and filling of balance fluid. At present, in the high-pressure wells exploited in oil fields, due to the limitation of their pressure bearing capacity, the existing structure is usually complex and huge, and the installation is very difficult. The casing head is particularly expensive, but for some medium and low pressure wells, if the above-mentioned casing head is also used, its use cost will become a burden on benefits, lacks effective pertinence, and is not conducive to extensive promotion and popularization. The above problems, the application provides a casing head for oil field to solve

Images