A snubbing well sealing device at the head of an oil production well

Abstract

The invention belongs to the field of oil pumping unit oil extraction equipment and particularly relates to an oil extraction wellhead non-well-killing well shut-in device. The oil extraction wellheadnon-well-killing well shut-in device comprises a well shut-in unit and further comprises a clamping sealer A and a clamping sealer B. The well shut-in unit, the clamping sealer A and the clamping sealer B are connected in a welded mode from top to bottom through round pipes. The upper side of the well shut-in unit is connected with a clamp joint, and the lower side of the clamping sealer A is connected with a flange plate matched with a wellhead flange. The well shut-in unit is of a cylindrical structure, two well shut-in unit partition plates in pairs are arranged in the well shut-in unit ina bilateral symmetry mode, and the two well shut-in unit partition plates each make reciprocating movement along the axis of the well shut-in unit through a screw rod. Through the clamping sealer A or the clamping sealer B, when packing is replaced, an oil pumping polish rod can be clamped through the clamping sealer A or the clamping sealer B, thus the oil pumping rod can be stably suspended above a wellhead, the requirement for an oil pumping unit braking system is reduced, and meanwhile the potential safety hazard is eliminated.

Description

technical field [0001] The invention belongs to the field of pumping unit oil production equipment, in particular to a snubbing well sealing device at the head of an oil production well. Background technique [0002] Pumping well is the most common oil production equipment in oilfield production. Its working principle is: a driving mechanism is installed on the ground, and a plunger pump is installed underground in the oil well. The driving mechanism and the pump are connected through the sucker rod, and the driving mechanism The plunger in the oil well pump is driven to reciprocate by the sucker rod to lift the crude oil downhole to the surface. [0003] In order to prevent the downhole liquid from ejecting under formation pressure when the sucker rod reciprocates, it is necessary to install a sealing packing box on the top of the wellhead device. The packing installed in the packing box will wear out and fail after long-term use, so it needs to be replaced irregularly. A...

AI Technical Summary

Problems solved by technology

The above operation method has high requirements on the stability of the parking brake system of the pumping unit. Once the brake fails, the donkey head and the sucker rod will suddenly fall, causing safety hazards

[0004] In addition, when a sucker rod breakage accident occurs, the wellhead seal will inevitably fail, and a large amount of downhole liquid will be ejected

In the existing technology, it is usually necessary to use large-scale equipment to deal with the above-mentioned accidents. It takes a long time from the discovery of the accident to the arrival of the large-scale equipment, and the timeliness of accident handling is very poor.

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