Multifunctional well mouth sealing blowout-prevention box

Abstract

The invention relates to a multifunctional well mouth sealing blowout-prevention box. The multifunctional well mouth sealing blowout-prevention box comprises an upper stuffing box, a lower stuffing box, a body tube column and a lower connecting body which are sequentially connected from top to bottom and can be used for the polish rod of an oil pumping unit to be inserted, wherein upper packing is arranged in the upper stuffing box and the upper stuffing box is provided with a packing gland, lower packing is arranged in the lower stuffing box, a valve ball seat body is coaxially and fixedly installed in the body tube column, and a valve ball mechanism is arranged at the middle of the body tube column under the valve ball seat body in a criss-cross mode and comprises a shaft barrel, a sliding plunger piston, a polish rod seat and a shaft barrel end cover. The sliding plunger piston is installed in the shaft barrel, a horizontal plunger piston spring is arranged at one end of the sliding plunger piston and the shaft barrel, a valve ball is arranged in the valve ball seat at the end of the sliding plunger piston, a longitudinal valve ball spring is arranged between the bottom of the valve ball and the valve ball seat, and the polish rod seat is fixedly arranged at the outer end of the sliding plunger piston. The problems of polish rod breakage and fall, eccentric abrasion of an oil well, horse head and well mouth misalignment, short service life of the corresponding polish rod and the like are effectively solved.

Description

technical field [0001] The invention belongs to a wellhead sealing device of an oil production device, in particular to a multifunctional wellhead sealing blowout prevention box. Background technique [0002] The sucker rod blowout preventer is a safety combined sealing device installed at the wellhead to prevent well kicks and blowouts that may be caused by formation high-pressure gas entraining crude oil and water during workover operations and lifting sucker rods in oil fields. At present, due to problems such as broken rods of pumping units, eccentric wear of oil wells, misalignment of donkey heads and wellheads, short service life of corresponding polished rods, dry grinding caused by intermittent oil production, and high water content wells, etc., oil and gas spillage from wellheads will occur . The structure of the existing sealing device is relatively complicated, such as the use of hydraulic principles to control the closing of the gate, etc., there are problems of...

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Problems solved by technology

At present, due to problems such as broken rods of pumping units, eccentric wear of oil wells, misalignment of donkey heads and wellheads, short service life of corresponding polished rods, dry grinding caused by intermittent oil production, and high water content wells, etc., oil and gas spillage from wellheads will occur

The structure of the existing sealing device is relatively complicated, such as the use of hydraulic principles to control the closing of the gate, etc., there are problems of complex structure and difficult manipulation; moreover, its service life is short, and the replacement process of sealing packing is troublesome; and it cannot provide solutions for the above-mentioned many problems

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