SU951088A1 - Depth manometer - Google Patents

Description

one

The invention relates to pressure measurement instruments for depth and can be used in the study of wells.

Known designs of deep-spring-piston pressure gauges with local registration, operating according to the following scheme. When the manometer is lowered into the well, the pen (needle) of the pipper device produces a proportional to the pressure value on the chart form, and when you lift the gauge, the pen returns to its original (zero) position 1.

However, when the manometer is lowered and raised, there are sometimes situations where the pen does not come into contact with the form and is absent for longer periods of time.

The closest in technical essence to the present invention is a depth precision manometer with local registration MGPP-3, consisting of a manometric unit with a recording device, a clock drive unit for rotating the drum with a diagram, an electric drive unit with an automatic chopper for rotating the power supply. . Gauge block is made in

as a camera with a helical spring rigidly connected to the piston. The piston is connected to a carriage equipped with a squeaking feather that slides along two strings fixed on the stand along the axis

5 of which the drum is centered with a chart form on the inner surface. In the upper part of the drum with the help of the pin and the coupling is connected to the clock drive, which makes it possible to produce a continuous, jerky scan of the recording along the time axis of% 2.

However, when the manometer is triggered due to impacts on the casing and tubing, the pen is very often not in contact with the chart form and there is no recording in such cases. In the case of displacement of the chart blank, the entry in decoding gives distorted results. And, finally, the clock drive, which was the most unreliable bin gauge assembly, stops or even breaks in approximately 2 cases from AND) when the instrument is lowered into the well. The aim of the invention is to improve the reliability of the reading of the maximum bottomhole and reservoir pressure.

This goal is achieved by the fact that a depth gauge comprising a housing in which a receiving chamber with a filter is placed, a manometric block with a measuring piston equipped with a pen and a recording unit including a drum with a diagram and an actuator is equipped with a valve assembly in the form of a spring-loaded ball check valve placed between the filter and the piston, and an additional calibrated scale is installed in the registration unit, mounted parallel to the axis of the piston, while in the valve seat on the supply side of the measured medium The food is mounted on the thread of the pusher, in the body of which a through channel is made.

FIG. 1 shows a manometric block; in fig. 2 - recording device.

In the manometric block there is an opening in the housing 1, a filter 2 connected to the chamber 3. The chamber 3 via the channel 4 in the push rod 5 communicates with the valve chamber 6, in which a spring 7 is placed, holding the ball valve 8 overlapping the channel 4. The valve chamber 6 through The channel 9 is connected to the gauge 10. A measuring spring 12 is placed in the tube of the manometric unit 11, rigidly connected to the piston 3, which ends with a pen 14. A diagram blank is fixed on the inner surface of the drum. In addition, an additional scale 15 is fixed in the recording device fixed with divisions in pressure values. The scale 15 is rigidly fixed with a gland sleeve connecting the manometric part with the recording part of the manometer.

Depth gauge works as follows. ,

During the descent of the device into the well borehole fluid, the passage through the opening 1 in the housing, the filter 2, the chamber 3, the channel 4 in the pusher 5, squeezing out the ball valve 8, enters the valve chamber 6, and from there through the channel 9 into the chamber 10 of the manometric unit. The measured pressure from the chamber 10 is transmitted to the working fluid filling the tube of the manometric unit 11. Under the action of this pressure, the piston 13 expands the measuring spring 12 and displaces the pen 14 of the gauge recording device along the vertical axis.

When the rotating chart form of the mechanism is operated, pressure is recorded from wellhead to the bottom of the well on the chart form. But when lifting the device, the spring 7 presses the ball valve 8, which at the same time closes the channel 4, not allowing the fluid to flow out of the chambers 6 and 10. Due to this, the piston 13 continues

hold the pen 14 at the position of the maximum bottomhole pressure, which is read by the additional calibrated gauge 15 after the manometer is raised.

After reading the maximum pressure reading, the pusher 5 of the pressure gauge is screwed into the housing, pressing the ball valve 8 into the valve chamber 6. Then the fluid through the channels 9 and 4 flows out of the chambers and the piston 13 returns the pen 14 to its original (zero) position.

The introduction of a manometric block of a valve chamber with a ball valve and spring in it and an additional calibrated scale into a mannol meter recording device with local pressure registration ensures 100% reliability of the maximum and reservoir pressure readings. As a result, the need to perform repeated tripping operations of the device into the well in cases of unsuccessful measurements (no recording, shifting of the cartogram blank, etc.) is eliminated, which in turn leads to a decrease in oil production loss due to the shutdown of the well during pilot work, to reduce the time for the study of one well, which ultimately saves in the national economy.

Claims (2)

1. The author's certificate of the USSR № 112140, cl. G About L 7/16. 1975. 2. Petrov .4. I. Methods and measurement techniques for field research wells. M., 1972, p. 90-92 (prototype).