SU1420411A1 - Apparatus for calibrating and testing downhole pressure gauges - Google Patents

Abstract

The invention relates to a well logging tool. The purpose of the invention is to simplify the design and reduce the time to reach the operating mode. For this purpose, sections of radiators 12c are symmetrically fixed on pipe 10c and retractable electric heating elements 13 secured in them. Thermal insulating gaskets 14 are installed between sections of radiators 12. In the central part 15 of radiator 12, sensors 16 for controlling high-pressure chambers 17 and temperature control 17 are installed. The length of the extreme sections of radiators 12 is selected in such a way that the power of the sections of heaters enclosed in them is equal to the power of heat losses through the ends of the high-pressure chamber 1. The implementation of radiators, divided into sections, allows organizing a zone in the high-pressure chamber 1 of sufficient length, the axial temperature gradient within which is within the prescribed limits, 2 sludge. SS a c

Description

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BACKGROUND OF THE INVENTION The invention relates to a device for logging boreholes, in particular to test and calibration equipment for borehole monomerosis.

The purpose of the invention is to simplify the design and reduce the time to reach the operating mode.

FIG. Figure 1 shows a schematic (device image; Fig. 2 - {high pressure chamber, cross section).

i The device contains a chamber 1 of high pressure, associated with pipelines with an oil tank 2, a pump 3, (high pressure station 4, samples; pressure gauge 5 and equipped with a safety valve 6, shut-off valves 7 and 8. The oil tank 2 is equipped with a coil 9 for passing cold water. The high pressure chamber consists of a thick-walled pipe 10 that is plugged from one end and has a stopper 11 on the other. Radiator sections are symmetrically fixed on pipe 10 12 with tubular electric heating elements fixed in them 1 3. Between the radiator sections, heat-insulating i-pads 14 are installed. In the central part 15 of the radiator, gauges of control 16 and temperature control 17 of the high-pressure chamber are caulked.

Each pair of semi-cylinders 18 sections of radiators is strung on the pipe with four screws 19. Tubular elements 13 for improving heat transfer are fixed in sections of radiators with terminal clamps 20,

The length of two sections of radiators located at each of the ends of the high-pressure chamber is determined from the ratio:, Nn

where N is the heat loss power at the ends of the high-pressure chamber; N - power electric heater

element; . L is the length of the electric heater

an item; P -; the number of electric heaters

elements installed in the radiator;

 - length of sections of electric heaters located in

.

Q

j about 5 Q

0

,

five

five

five

112

the limits of the extreme sections of radiators;

 - coefficient, take into account the distribution of heat in the radial and axial direction and equal to 0.6-0.8. Calibration or verification of a well manometer is performed as follows.

A well pressure gauge is placed in cavity A (Fig. 1), and the chamber is closed with a plug 11. The shut-off valves 7.8 are opened, the cavity A is filled with oil with a pump, and some time is pumped through to completely remove any air bubbles. In this case, the pump is turned off, valves 7 and 8 are closed, and using a high-pressure station 4 or a pressurized pressure gauge 5 in cavity A, a number of pressure values are created at which the readings of the well pressure gauge are taken. Then the pressure is released, the well manometer is removed from the chamber. To determine the additional temperature error, the measurements described are performed in a chamber in which the temperature is maintained;

different from normal. (mostly larger than normal). To do this, a preset temperature is set at the temperature setter, the chamber is heated up. The camera, with the well manometer placed in it, is filled with oil and pumped until the air is completely exhausted. After the camera reaches the specified temperature, the valve 7.8 is closed, and the pressure is measured in the usual order.

In order to accelerate the cooling of the high-pressure chamber and the heated well gauge, the valves 8 and 7 are opened and the oil is pumped through the tank, through which the cooling fluid is passed through the coil.

The use of radiators divided into sections of small length simplifies their manufacture, ensuring that the high-pressure chamber fits more closely to the pipe surface, which improves heat transfer.

The use of clamps for securing electric heaters in the radiators provides a tight junction. tact at the junction of their surfaces,

heat transfer, in addition, facilitates the replacement of the heating element

The use of a radiator divided in length into sections of different lengths with heat-insulating gaskets installed between the sections allows the use of standard tubular electric heating elements Q to allocate the necessary heating zones. The length of the extreme sections of the radiators is chosen in such a way that the power of the sections of the heater. rub through the ends of the high pressure chamber. Thus, the use of radiators divided into sections allows organizing a zone in the high-pressure chamber of sufficient length, n the axial temperature gradient within which is within the prescribed limits .... Claims

A device for calibrating and checking downhole gauges, comprising a cylindrical high pressure chamber; equipped with a heater, pressure source and exemplary mano4

-

Q p

five

0

114

meter, so that it, in order to simplify the construction and reduce the time to reach the operating mode, the heater is made in the form of two covering chambers and fixed radiator halves, in each of which using parallel terminals cylindrical The chamber is equipped with a pipe-like electric heating elements, the radiator is installed along the length of the section between the heat-insulating gaskets of the sections, and the length of 1 end section is determined from the ratio of

, 2NrL

where N is the heat loss power at the end of the high-pressure chamber;

N is the power of the tubular electric heating element;

L is the length of the tubular electric heating element;

n is the number of electric heating elements in the radiator;

2 - coefficient taking into account

heat removal from the end sections of the radiator in the axial direction equal to 0.6-0.8.

/ 3

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fie. 2

Claims (2)

The claims 25 A device for calibrating and checking downhole pressure gauges containing a cylindrical high-pressure chamber equipped with a heater, a pressure source and an exemplary pressure gauge, characterized in that, in order to simplify the design and reduce the time for reaching the operating mode, the heater is made in the form of two enveloping chambers and fastened half of the radiator, in each of which tubular electric heating elements are installed parallel to the cylindrical chamber using terminal clamps, the radiator being made in length de separated by insulating spacers sections, and the length of end sections 1 is determined from the relation ^Nia · ^ _{1 =} 2N _r L where Ν _τ - thermal power losses at the end of the pressure chamber; N is the power of the tubular electric heating element; L is the length of the tubular electric heating element; η is the number of electric heating elements in the radiator; 2 - coefficient taking into account heat removal from the end sections of the radiator in the axial direction, equal to 0.6-0.8.