SU1000802A1 - Depth pressure gauge - Google Patents

Description

- (. 54) DEEP MANOMETER

The invention relates to oil production and can be used in hydrodynamic studies of wells for measuring pressure and temperature in oil and gas wells.

Depth gauges are known for measuring pressure in operating and stopped fountain, compressor, submersible pumping, injection, as well as in piezometric wells on the ground and along the shaft tl.

The lack of depth gauges. is the effect of temperature on their readings, which is taken into account by introducing a calculation by means of temperature corrections using data obtained from their calibration. The latter significantly complicates instrument calibration and increases the labor intensity of deciphering the readings of deep gauges.

The closest to the technical essence of the proposed manometer is the deep Helix manometer MGG-2U, which is designed to measure high pressures at elevated temperatures.

The well-known pressure gauge consists of a body, an hour-long carriage drive

with chart form writing pen,. bellows with Gölix, filled with liquid, and the maximum thermometer.

The measured pressure through the hole in the housing is transferred to the bellows, compressing it, increases the pressure of the fluid in it and the helix. Under the action of this pressure, the free end of the helix is rotated by a certain angle proportional to the measured pressure. The angle is recorded with a stylus on the chart form inserted in the carriage. To obtain a continuous recording of the change in pressure over time, the carriage moves progressively under the influence of a clock actuator.

A max-gauge is used for the purpose of introduction by calculation. 2 temperature corrections to the manometer readings. After its removal from well C.

The main disadvantage of the manometer is in-. The effect of temperature on the test is shown as follows.

Helix and bellows filled with liquid are a closed system that, when exposed to temperature, works

actually like a liquid thermometer. Therefore, the ambient temperature significantly affects both the pressure gauge reading and the method of its calculation and calibration.

In addition, during shocks in the process of lowering (lifting) the depth gauge into the well, the indications of the maximum thermometer may change, which will also lead to additional errors.

The design of the MGG-2 pressure gauge does not allow for the production of interval tools. at different depths, pressure measurement in one trip. This is explained by the presence in the MGG-2 design of a maximum thermometer, whose readings are not recorded. Therefore, to decipher the readings of the manometer after measuring the pressure at each depth, it is necessary to extract it from the well and record the readings of the maximum thermometer in order to introduce a correction to the effect of temperature.

The purpose of the invention is to improve the measurement accuracy by eliminating temperature error and expanding the functionality.

This goal is achieved by the fact that the well-known Helix depth gauge is equipped with a thermometer system located in the manometer housing, filled with liquid with a thermal receiver connected to an additional helix, equipped with a pen with a writing pen at the end, the volumes of the manometric and thermometric systems and the fluids filling them are the same, the thermal receiver is placed above the separator bellows, and the helixes are mounted coaxially, with the additional helix stem placed inside the first helix, parallel to its axis a ur downward arrangement of writing pens relative to each other are shifted in height.

Figure 1 shows a schematic diagram of a depth gauge; Fig. 2 shows an example of a record of a manometer reading on a chart form.

. The depth gauge consists of body 1, clock 2, carriage 3 with a chart form, writing pens 4 and 5, bellows b, helix 7 and 8, and thermal receiver 9. The volume of thermal receiver 9c helix 8 is equal to the volume of bellows with helix 7.

The measured pressure is transmitted through the opening a in the housing-1 to the bellows b, compressing it, and the pressure of the fluid in it and the helix 7 increases. Under the action of this pressure, the free end of the helix 7 is rotated by a certain angle proportional to the measured pressure. The magnitude of the angle is recorded with a stylus 4 on a chart form in a carriage 3.

To obtain a continuous recording of the change in pressure over time, the carriage 3 moves progressively under the action of the clock actuator 2. At the same time, the helix 7 and the bellows 6, filled with liquid, are a closed system that, as a matter of temperature, works virtually like a liquid thermometer i.e. under the action of the temperature, the pressure of the fluid in this system increases, which causes the free end of the helix 7 to turn through some additional angle. The angle of rotation is fixed by pen 4 on the chart form, in carriage 3. This additional angle is the temperature error of the manometer. Under the action of the same temperature, the liquid in the thermal receiver 9 also expands, increasing the pressure in the system of the thermal receiver 9 - helix 8. Under the action of the specified pressure, the free end of the helix 8 is rotated by the same additional angle as mentioned above. The angle is recorded with a stylus 5 on the same chart form in the carriage 3. The recording is performed synchronously with the recording of the pressure measured

pressure gauge.

...

Line 0-0 (figure 2) is drawn

pen 4 when moving the carriage 3 manually before the device is lowered into the well and corresponds to zero excess (atmospheric) pressure plus ambient temperature. Line О-О is drawn by pen 5 when the carriage 3 is moved by hand before the device is lowered into the well and corresponds to the ambient temperature. Since the recording of pens 4 and 5 occurs synchronously, the distance between the 0–0 and O – o lines corresponds to the excess (atmospheric pressure).

The line abed, recorded by pen 4, corresponds to pressure plus temperature during descent, exposure at a given depth and elevation of the depth gauge.

The line c (t) cd recorded with pen 5 under the same conditions corresponds to the temperature.

The distance between the abed and a-focd ordinates corresponds to the measured pressure. So, for example, segments 1sy, tp and rs correspond to pressure at certain depths in the well during descent, holding and raising the depth gauge from the well.

To measure temperature and pressure at different depths, it is necessary to withstand the proposed device at a given depth for a certain period of time. This will avoid errors due to the inertia of the device.

Thus, in one single tripping operation, the proposed depth gauge will allow to measure and simultaneously register pressure and temperature at various depths of the well. At this temperature, the error is automatically eliminated. which does not require additional calculations associated with the introduction of temperature corrections for decoding the pressure value according to the diagram

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The technical and economic advantages of the proposed manometer are as follows. The number of tripping operations is reduced during interval testing of pressure and temperature in the well.

The measurement accuracy of the instrument is improved and the diagram is easier to decipher.

There is no need for two instruments (depth gauge and thermometer), the functions of which are performed by the proposed instrument.

Synchronous recording of pressure and temperature is made on one diagram form from a one-hour drive.

Claims (2)

1. Authors certificate of the USSR 263227, cl. G 01 I, 7/04 1968. 2.irieTpos dGi. Methods and technique of measurement in commercial field surveys. M., 1972, p. 97 1 prototype). t