Well mouth protection device and special tool

Abstract

The invention provides a well mouth protection device and a special tool. The well mouth protection device comprises a connecting pipe arranged in the vertical direction, wherein a clamping rotary rod is arranged in the connecting pipe in the axial direction, an eccentric crank hinge pin is arranged above the clamping rotary rod in the vertical direction, the axis of the eccentric crank hinge pin and the axis of a crank clamping rotary rod are mutually staggered, and the bottom end of the eccentric crank hinge pin is fixedly connected with the top end of the clamping rotary rod. The bottom end of the clamping rotary rod is connected with the top end of a locking lead screw, the locking lead screw comprises an upper threaded section located at the upper portion of the locking lead screw and a lower threaded section located at the lower portion of the locking lead screw, a lower clamping nut is screwed to the lower threaded section of the locking lead screw, an upper clamping nut is screwed on the upper threaded section of the locking lead screw, and the lower portion of the upper clamping nut is a shape of a circular truncated cone with a downward cone corner. The well mouth protection device and the special tool can prevent foreign matter from dropping into a well and thoroughly destroying the well, the event that well mouth accessories are stolen is prevented fundamentally, and safety guarantee is provide for oilfield production.

Description

technical field [0001] The invention relates to a wellhead protection device and a special tool. Background technique [0002] The wellhead protection device is a special wellhead protection device designed to protect abandoned wells, long-term shutdown wells, and wells to be treated. [0003] There are tens of thousands of oil wells in the oil field, and these oil wells are scattered between cities and countryside. The number is large, the distribution is wide, and the management work is difficult. Wellheads are often stolen, especially some abandoned wells, wells that have been shut down for a long time, and wells that are waiting for treatment. These wells are not used for a long time, so the four links, valves, well sealing covers, clamps, bolts, etc. on the wellhead are easy to be stolen. Once these wellhead devices are stolen, the wellhead will be left open, and no one pays attention to it for a long time, which will easily cause foreign objects to fall into the well...

AI Technical Summary

Problems solved by technology

Since these wells are not used for a long time, the crosses, valves, well covers, clamps, bolts, etc. on the wellhead are easy to be stolen.

Once these wellhead devices are stolen, the wellhead will be open, and no one pays attention to it for a long time, which will easily cause foreign objects to fall into the well and make the oil well completely useless

cause great loss

At the same time, if there is pressure in the well, it will easily cause excessive pressure and eruption, endangering the safety of people around.

[0004] In addition, the wellhead treatment method of abandoned wells, long-term wells, and wells to be treated is generally to install a sealing cover. The oil well is closed for a long time, and the pressure and other data in the well cannot be judged. If it is opened rashly, an accident will occur

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