SU608918A1 - Device for measuring face pressure in wells formed by centrifugal pump with submersible electric motor - Google Patents

Description

one

The invention relates to the field of oil production, in particular, to devices for measuring bottomhole pressure in wells with submersible electric pumps.

A device is known for measuring bottomhole pressure in wells equipped with a centrifugal pump with a submersible electric motor, equipped with a special pipe with a conical seat mounted in it, through which the spaces in the tubing above and below it are separated at the time of landing in the saddle depth gauge equipped with tip 1. The device allows the measurement of formation and downhole pressures.

The disadvantage of this device is that an increased starting current moment with a large number of successive inclusions leads to an overload of the electric motor and its failure.

The purpose of the invention is to provide minimum values for the starting current of the motor.

This is achieved by the fact that the device is equipped with a valve assembly installed below the conical seat, made in the form of a differential GOLDEN DRAIN and non-return valve with a shock absorber;

the latter is connected via a rod to a drain valve.

The drawing shows the proposed device.

It consists of a housing 1 drain valve, differential spool 2, housing

3 reverse valve, check valve 4, chamber 5 with piston 6 and locking sleeve 7. In the upper part of the housing 1 of the drain valve

a cone-shaped saddle for fitting a depth gauge equipped with a special tip 8 is made. The pump tubes 9 are connected to the body 1 with a tapered thread. The upper part of the differential spool 2 is the locking element of the DRAIN valve, and its lower part with the piston 6 and the cavity of the chamber 5 forms a shock absorber. The device works as follows.

When the pump is running check valve

4 is in the open position and the drain is in the closed position.

After descending into the pump tubes of the submersible manometer with tip 8 and turning off the pump, the check valve 4 closes and the drain opens, while the internal cavity of the DRAIN valve communicates through the channels A and B with the annular space.

At the end of the pressure measurement, the pump is started up and under the action of the pressure developed by the pump, the check valve 4 is pushed out of its seat and lifts the spool 2 of the drain valve together with the piston 6 until it stops at the lower end of the body 1 of the drain valve. In this case, the upper part of the spool 2 closes the opening A, and the liquid supplied by the pump is directed through the valve seat through the channels D and D.

Due to the presence of the shock absorber, the openings B do not open immediately after the pump starts operating, but with some delay.

The presence of a valve assembly, made in the form of a differential spool and non-return valve with a shock absorber, makes it possible to reduce the starting current of the submersible electric motor, which leads to an increase in its reliability and service life while maintaining the quality of pressure measurements.

Claims (1)

The invention The device for measuring downhole pressure in wells equipped with a centrifugal pump with a submersible motor, including tubing, a pump above which is installed a nozzle with a tapered seat and a tip of a depth gauge, characterized in that, in order to ensure the minimum starting current of the motor , it is equipped with a valve assembly installed below the conical seat, made in the form of a differential spool drain and check valve with a shock absorber, p and the latter is connected by a rod to the drain valve. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 112629, cl. E 21B 47/06, 1957.