A tailpipe hanger

Abstract

The invention proposes a liner hanger, especially a liner hanger with a recoverable driving mechanism, which belongs to the field of downhole tools for oil cementing and completion, and includes an external device, including a suspension mechanism provided with slips, and a The suspension mechanism makes the slips open; the internal device includes a seat-hook driving mechanism, which can be connected through a plug cap and drive the retraction cylinder to move; wherein, the external device Remaining in the well after the cementing operation, the internal device lifts the wellhead after the cementing operation. In the present invention, after the setting is completed, the seat-and-hook drive mechanism lifts out the wellhead after cementing construction, which eliminates the potential risk point and weak point that the seat-hook drive mechanism remains in the well for a long time, and greatly improves the pressure resistance and durability of the liner hanger. Longevity of the string seal.

Description

technical field [0001] The invention relates to a liner hanger, in particular to a liner hanger with a recyclable driving mechanism, belonging to the field of downhole tools for oil cementing and completion. Background technique [0002] Liner hanger is a commonly used downhole tool in petroleum exploration and development at present. It can be divided into three types: mechanical type, hydraulic type and hydraulic-mechanical double-acting type according to the different sitting and hanging methods, and the hydraulic type liner hanger is the most widely used. widely. The hydraulic liner hanger activates the liner hanger cylinder by holding down the pressure in the pipe. At present, in order to solve the problem of liner cementing in complex well conditions such as deep wells, small clearance wells, and large-reach wells, a variety of different types of hydraulic liner hangers have been developed in China. Advanced features. [0003] However, the traditional hydraulic line...

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Problems solved by technology

[0003] However, the sit-hang driving mechanism of the traditional hydraulic liner hanger is designed outside the hanger body, and will stay in the well for a long time after the cementing construction is completed. Because the sit-hang drive mechanism inevitably needs to use rubber seals, and the rubber seal Parts are prone to aging in the high-temperature and high-pressure environment in the well for a long time, resulting in the failure of the seal at the drive mechanism of the set-hanger, thus affecting the sealing durability of the entire wellbore

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