Oil field wellhead sealing hydraulic device

Abstract

The invention discloses an oil field wellhead sealing hydraulic device. The oil field wellhead sealing hydraulic device comprises a prime cylinder and a spinning cylinder. Hydraulic oil is supplemented to the prime cylinder through an oil supplementing device, a piston in the prime cylinder is pushed by the pressure of crude oil under an oil well, the piston pushes the hydraulic oil to enter the spinning cylinder, a threaded sleeve at the front end of the spinning cylinder is connected with a wellhead casing pipe, a hollow rod and a small piston are arranged in the spinning cylinder, a wellhead polished rod penetrates through the hollow rod and the small piston, and a sealing piece is pressed at the front end of the hollow rod. The pressure oil entering the spinning cylinder pushes the piston, the piston drives the hollow rod and the sealing piece at the front end of the hollow rod to automatically move downwards, the sealing piece is pressed, automatic sealing is achieved, manual screwing sealing is replaced, and the wellhead of the oil well is effectively sealed by the pressure of the crude oil under the well.

Description

Technical field: [0001] The technology of the proposal belongs to the field of hydraulic technology, and in particular relates to a hydraulic device for oilfield wellhead sealing, which is suitable for wellhead equipment for oilfield exploitation. Background technique: [0002] The crude oil in the oil well is a viscous, dark liquid with mixed gas; the wellhead mining equipment contains a polished rod, which reciprocates up and down, and the oil and gas mixture in the oil well will be brought out with the movement of the polished rod, causing damage to the oil well. Pollution has brought great technical difficulties to oil well environmental protection. [0003] The sealing of the polished rod in the wellhead mining equipment of the oil field is from the early installation of a packing box on the upper end of the wellhead. It has a certain sealing effect, but the effect is extremely poor; the commonly used sealing method for the wellhead in the current technology is that a ...

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Problems solved by technology

[0002] The crude oil in the oil well is a viscous, dark liquid with mixed gas; the wellhead mining equipment contains a polished rod, which reciprocates up and down, and the oil and gas mixture in the oil well will be brought out with the movement of the polished rod, causing damage to the oil well. Pollution has brought great technical problems to the environmental protection of oil wells

[0003] The sealing of the polished rod in the wellhead mining equipment of the oil field is from the early installation of a packing box on the upper end of the wellhead. It has a certain sealing effect, but the effect is extremely poor; the commonly used sealing method for the wellhead in the current technology is that a nut is set on the polished rod, a hollow pressure sleeve is inside the nut, and a sealing washer is placed under the pressure sleeve. It is hollow, the polished rod passes through the hollow pressure sleeve, and reciprocates up and down; because the polished rod bears alternating loads during work, it reciprocates up and down, and after the seal is worn, tighten the upper nut to make the seal press together until the seal is complete Ineffective, this method cannot effectively prevent the oil-gas mixture in the oil well from overflowing, and it is easy to cause oil and gas to blow out and pollute the oil well

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