SU1421857A1 - Device for measuring liquid level in well - Google Patents

Abstract

The invention relates to a measurement technique and is used in the oil industry. The purpose of the invention is to improve the safety and reliability of the device at work. It contains a housing 1 and an acoustic pulse receiver 14 installed on it and a pulse shaping unit with a stationary 2 and 4 movable flanges (F), consisting of a safety valve 16 with a shutter 7 and a pulse valve with a shutter 8, a driving handle 9 and rigidly fixed on Ф 2 of the corrugated cylinder 3 with a hollow rod (Ш) 5 located along its longitudinal axis, passing through the central axial hole in Ф 2,. At one end of Ш 5, the bolt 7 is fixed, and on the other - Ф4о. o Shutter 7 run flap in the form of a saddle with a bolt installed in it. Inside B 5 a pusher 10 is placed. Under overpressure, sjordschr 3 acts on W 5 and closes the shutter 7o. , for this f. " serves valve 16. When using this device increases the level of the probe pulse. 1 pe.

Description

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The invention relates to the measurement of the liquid ZFrvn and can be used in the oil industry in determining the level of viscosity in the annulus of the well.

The purpose of the invention is to improve the safety and reliability of the device.

The drawing shows the structure of the proposed device.

The device contains a body 1 with a fixed flange 2 to which a corrugated cylinder Zo is fastened with an end part. The opposite end thereof is attached to the movable flange 4 fixed to the hollow rod 5, which, located inside the corrugated 1st cylinder 3, can move in sleeve central axial bore of the fixed arm 2 o

At the end of the hollow stem 5, facing the strip of the housing 1, is located; the shutter 7 of the safety valve, the seat of which serves as the internal surface of the fixed flange 2 ". In the cavity of the shutter 7 of the safety valve, the valve 8 is placed the pulse valve, the seat of which is the valve 7 of the safety valve.

The shutter 7 of the safety valve.- separates the cavity of the housing 1-, with the cavity of the corrugated cylinder 3, when the latter is in the extended position.

The shutter 8 of the pulse valve closes the cavity of the hollow stem 5, preventing gas from escaping through it from the cavity of the housing 1. The shutter 8 of the pulse valve is actuated by the actuator handle 9 through the pusher 10 located inside the hollow stem.

The housing has a coupling 11 with threads for connection to the well and two seats 12 and 13 for mounting the receiver 14 of the acoustic pulse and the pressure gauge 15. The movable flange 4 has a safety valve 16.

The device works as follows

When measuring the fluid level in the well by an acoustic method, a sounding acoustic pulse is excited at the wellhead, which propagates in the medium filling the annulus (associated gas), reaches the liquid level and, reflecting from the gas-liquid interface

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five

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come back. The latency of the reflected pulse relative to the probe pulse is the value by which the position of the fluid level in the well is judged.

Depending on the technological mode of operation of the oil well, the gaseous medium over which the acoustic impulse propagates can be either under greater pressure or equal to the atmospheric pressure.

In the absence of pressure, the acoustic pulse is excited by a change in the volume occupied by the corrugated cylinder 3. For this, the pre-compressed corrugated cylinder 3 is shifted to the expanded state with the aid of the actuator knob 9. The resulting vacuum propagates through the wellbore, is reflected from the fluid, and is recorded by the acoustic impulse receiver 14.

In the presence of pressure, the excitation of the acoustic impulse is due to the short-term release of gas from the well bore. In this case, the excess pressure, acting on the corrugated cylinder 3, moves the hollow rod 5 and closes the shutter 7.

safety valve. This is when-. leads to the dissociation of the cavities of the corrugated cylinder 3 and the housing 1 and prevents the corrugated cylinder 3 from destruction at high pressure. The safety valve 16 serves the same purpose, activating the pressure when the permissible value is exceeded.

The gas is released from the well by striking one of the ends of the actuating handle 9, in which case the force is transmitted through the push rod 10 to the shutter 8. of the pulse valve, which opens.

The resulting acoustic pulse, as in the previous case, propagates through the wellbore and, being reflected from the fluid, is perceived by the receiver 14 of the acoustic pulse.

In the proposed device, the safety and impulse valves are combined into a single valve assembly, the valve gate being made in the form of a seat for a pulse valve, and the valve assembly is located in the housing part, which simplifies the device and improves its safety and reliability.

In addition, the level of the edging pulse is increased due to the reduction of losses during its passage due to the placement of the pulse valve directly in the housing cavity.

Claims (1)

Invention Formula A device for measuring the fluid level in a well, comprising a housing and an acoustic pulse receiver mounted on it and an acoustic pulse formation unit with fixed and movable flanges, consisting of safety and impulse valves with pusher valves, a driving handle and fixed on a fixed flange of a corrugated cylinder a hollow rod located along its longitudinal axis, passing through a central axial hole in the fixed flange, at one end, the valve is fixed The safety valve, and on the other, the movable flange of the corrugated cylinder, is of such kind that, in order to ensure the safety and reliability of the device, a pulse valve is placed in the body cavity, the shutter of the safety valve is made in the form of a saddle, with the pulse valve installed in it, and the pusher is placed inside the hollow rod