DE102021127488A1 - Rod pump with a sensor for function monitoring - Google Patents

Abstract

Rod deep pump (1) with a sensor (10) for function monitoring, with a pump head (2) which is connected to a pump device (4) in a borehole via a cable and/or rod (3), with a shaft (5 ) mounted running beam (6), which connects the pump head (2) to a motor (7), which sets the running beam (6) and thus the pump head (2) in an up and down movement, with several starting from the borehole Ex-protection zones (EX0, EX1, EX2), characterized in that an acceleration sensor (10) for detecting the up and down movement of the running bar (2) on the running bar (2) or on one connected to the running bar (2) connected device is arranged in such a way that the acceleration sensor is in a non-critical Ex zone (EX2) and falls into the non-critical Ex zone (EX2) even if it detaches from the walking beam (2), the acceleration sensor (10) having its own power supply and a radio communication interface.

Description

The invention relates to a rod pump with a sensor for monitoring the function according to the species of the independent claims.

In oil production, rod deep pumps, so-called horsehead pumps, are often used. With these, a piston equipped with check valves is set in a constant up and down motion in the borehole. The pump stand required for this is located on the surface of the earth and converts the rotational movement of an electric or gas motor into an almost vertical up and down movement of the horse's head, to which the piston in the borehole is connected via a cable and/or rods.

Especially in the case of old boreholes, which only have a low flow rate, it is advantageous to design such pumps to be monitored as cost-effectively as possible. Here, for example, it can be reliably recognized whether the pump is still working.

From the EP 3 816 444 A1 For example, a method for determining the operating properties of a deep-rod pump is known, in which a functional capability of the pump is recognized on the basis of the current consumption of the motor operating the pump.

The object of the invention is to detect a periodic movement of an oil pump in a reliable and energy-efficient manner

The object is achieved with the rod pump according to claim 1.

A rod deep pump is advantageously provided with a sensor for monitoring the function, with a pump head which is connected to a pumping device in a borehole via a cable and/or rod,
with a running beam mounted on an axis, which connects the pump head to a motor, which causes the running beam and thus the pump head to move up and down, with several explosion protection zones extending from the borehole,
characterized,
that an acceleration sensor for detecting the up and down movement of the horse's head is arranged on the walking beam or on a device connected to the walking beam in such a way,
that the acceleration sensor is located in a non-critical Ex zone and falls into the non-critical Ex zone even if it detaches from the moving bar, the acceleration sensor having its own energy supply and a radio communication interface.

This device has the advantage that the functionality of a rod pump can be detected easily and reliably with the aid of an autonomously functioning sensor.

The invention is explained in more detail below using exemplary embodiments with reference to the drawings.

• 1 eine erfindungsgemäße Gestängetiefpumpe

They show schematically:

• 1 a rod pump according to the invention

According to the invention, provision is made for detecting the movement of a rod pump or its up and down movement with the aid of an acceleration sensor.

1 Fig. 1 shows a typical pump stand 1 with a pump head 2 which is connected via a cable and/or linkage 3 to a pumping device 4 in a well. The pump head 2 is connected via a running beam 6 mounted on an axle 5 to a motor 7 which causes the running beam 6 and thus also the pump head 2 and the pumping device 4 connected thereto to move up and down.

Various explosion protection zones EX0, EX1, EX2 extend from the borehole. An Ex Zone 0 extends directly at the borehole, in which an explosive air-gas mixture is to be expected frequently and over a long period of time during normal operation. This is followed by Ex Zone 1, in which an explosive mixture is to be expected during normal operation, and then Ex Zone 2, in which an explosive atmosphere can only occur rarely and only for a short time.

According to the invention it is now provided to detect the movement of the pump head 1 with the aid of an acceleration sensor 10 . The sensor 10 is advantageously attached at a position which is outside of the critical Ex zones EX0 and EX1. In addition, the position should also be selected in such a way that in the event of a malfunction, in particular if the sensor 10 becomes detached, the sensor cannot fall down into a critical Ex zone EX0, EX1.

The sensor 10 is therefore advantageously mounted on the side of the moving beam remote from the pump head.

Provision is also made to equip acceleration sensor 10 with its own power supply, for example in the form of a battery tery or an accumulator. In this way, the installation effort can advantageously be further reduced.

In a further refinement, the measurement data from the acceleration sensor 10 can be passed on, for example, via a radio communication module and recorded by a central monitoring station.

Reference List

1

linkage pump

2

pump head

3

rope / linkage

4

pumping device

5

axis

6

scroll bar

7

engine

10

accelerometer

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3816444 A1 [0004]

Claims (3)

Rod pump (1) with a sensor (10) for function monitoring, with a pump head (2) which is connected to a pump device (4) in a borehole via a cable and/or rod (3), with a shaft (5 ) Bearing running bar (6) which connects the pump head (2) to a motor (7) which causes the running bar (6) and thus the pump head (2) and the pumping device (4) to move up and down, several explosion protection zones (EX0, 1, 2) extending from the borehole, characterized in that an acceleration sensor (10) for detecting the up and down movement of the running beam (2) on the running beam (2) or on a The device connected to the running beam (2) is arranged in such a way that the acceleration sensor is located in a non-critical Ex zone (EX2) and falls into the non-critical Ex zone (EX2) even if it detaches from the running beam (2), the acceleration sensor (10) has its own power supply and a radio communication interface. Rod pump (1) after claim 1 , in which the acceleration sensor (10) detects a movement of the running bar (6) on the basis of the acceleration measured on the running bar (6). Rod pump (1) according to one of the preceding claims, in which the energy supply of the acceleration sensor (10) and a time interval between the measurements is designed such that the acceleration sensor (10) is operational for more than 12 months.

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