US3004426A

US3004426A - Dynamometers for deep well pump installations

Info

Publication number: US3004426A
Application number: US711999A
Authority: US
Inventors: Lodynski Emil
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-01-29
Filing date: 1958-01-29
Publication date: 1961-10-17
Anticipated expiration: 1978-10-17

Description

E. LODYNSKI 3,004,426

DYNAMOMETERS FOR DEEP WELL PUMP INSTALLATIONS Oct. 17, 1961 Filed Jan. 29, 1958 M 1 BY Qwm INVENTOR ATTORNEY tes Patent 3,004,426 Patented Oct. 17, 1961 3,004,426 DYNAMOMETERS FOR DEEP WELL PUMP INSTALLATIONS Emil Lodynski, 21 Badstrasse, Modling, Lower Austria, Austria Filed Jan. 29, 1958, Ser. No. 711,999 6 Claims. (Cl. 73-441) The present invention relates to a dynamometer arrangement of the type used for controlling the operation of deep well'pumps, particularly in oil wells.

The dynamometers used for this purpose consist substantially of a pressure sensing device, to which the loads acting on the pump rods are transmitted and the pressure readings of which are recorded by a recording measuring instrument on a sheet, which is reciprocated in unison with the up and down motion of the pump rod. "To be able to fulfil its purpose the pressure sensing device must be inserted in the force-transmitting line of the pump rod. More particularly, the pressure sensing device is inserted between the upper end of the pump and proper and the suspension device.

For the insertion of the usual types of these dynamometers the pump must be shutdown, the pump rod must be provided with an additional support and must be separated from the suspension device before the sensing device can be inserted. These steps mustbe performed in the reverse order for the removal. This temporary stand- 'still of the pump has the disadvantage that the subsequent measurements may be wrong because during this interruption of the operation of the pump the sand suspended in the liquid can settle on the pump piston and obstruct the operation of the pump considerably. in adverse cases this may even cause seizing of the piston.

It is the main object of the present invention to provide a dynamometer arrangement which eliminates said disadvantage of the known arrangement, because it enables a gradual insertion of the pressure sensing device into the force-transmitting line in such a manner, that the load is gradually taken over by the sensing device without interruption of the operation of the pump.

It. is another object of the present invention to prointerruption of the operation of the pump.

It is yet another object of the present invention to provide a dynamometer arrangement, wherein the insertion '0f :a pressure gauge into the force-transmitting line without interruption of the operation of the pump is achieved by a pressure cylinder having a piston,'the position of .which is variable by pressure liquid pumped into the 'same.

The cylinder and piston are inserted between a stop at the top end of the pump rod and the cross head of the pump andthe piston (or cylinder) is raised by the introduction of liquid eflected by means of a hand pump having a high transmission ratio until said stop .is

lifted sufiiciently to take up the load of the pump rod; in this way this load is transmitted by the pressure liquid in the cylinder to the cross-head. The recording dyna- 'mometer is connected tothe pressure chamber of the pump cylinder and records the load carried by the pump rod. v

In apreferred form of such arrangement a base plate .carries two pressure cylinders, each of which has a piston slidably arranged therein. These pistons are alsorigidly connected to each other by a plate or the like. in addition, a pair of hooks is afiixed either to the cylinder or piston and can be hung on a pair of pins provided at the rod head. Thus the suspension device is located in such manner that the plate, which connects the cylinders, engages the cross head and the plate, which connects the pistons, engages the underside of two stops attached to the rod head, or vice versa, when the pairs of pistons and cylinders are swung into position. 7

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

FIG. 1 is a front perspective view of the rod head and the cross head before the mounting of the pressure sensing device; and

FIG. 2 is a front perspective view of the rod head and the cross head jointly with the mounted pressure sensing device.

Referring now to the drawing, the ropes 8, which carry the cross head 9, depend from the so-called horsehead of the pump lever, which is oscillated by a motor. The rod 11 of the deep well pump extends through a bore in the cross head 9 and has at its top end the actual rod head 3! Contrary to the usual arrangement, the rod head 30 does not rest directly on the-cross head 9 but, is spaced from the cross head 9 by several sleeves 26, 26',

'27 and 29 passed over the pump rod 11. The sleeve 27 has mutually opposite outward projections 25 and hearing pins 28 also projecting outwardly in opposite directions and spaced above the projections 25. The

sleeves

26, 26 and 29 serve only for adjusting the correct distance between

parts

9, 25 and 30. The sleeve 26 serves also to enable a check whether the load has already been taken over by the cylinder; in this case the sleeve 26' is easily rotatable.

The device for taking over the pressure consists of two hydraulic pressure cylinders 31 and pressure pistons (plungers) 32 adjustable therein and firmly connected to each other by a plate 33, which has a central recess 34, which receives the sleeve 27. Upwardly extending hookshaped grippers 35 disposed on both sides of this recess serve for hanging the device into the bearing pins 28.

The two cylinders 31 are also carried by a plate 36,

.which connects the cylinders and has a recess receiving the spacer sleeve 26. Pressure conduits 37 extend to the pressure chamber of a small piston pump 38, which is ,operableby a cam 39 driven by a hand lever 40 (or pressure is connected to the bore 47 of the piston pump The mode of operation is as follows:

To check the performance of the pump, the hooks 35 of the pressure sensing device are hung on the pins 28, to cause the pressure sensing device to swing automatically in the position of operation. This is suitably efiected when the vertically reciprocating pump rod 11 is in its lowest position. In the position of operation of the pressure sensing device the plate 33 lies somewhat below the stops 25 and the plate 36 rests on the cross head 9. Now the pump 38 is operated by means of the hand lever 40 to pump liquid into the cylinders 31 whereby the pistons 32 are lifted to engage the underside of the projections 25 and, as the operation of the pump is continued, to lift the same together with the sleeve 27 and the rod head 30 sufiiciently until the load of the pump rod 11 no longer rests by means of the

sleeve

26, 26" on the cross head 9, but is now carried by the plate 33 and consequently by the piston 32. In this way the hydraulic pressure space in the cylinders 31 is inserted in the force-transmitting line and the recording device 55 indicates with the pressure in the cylindersjl also the entire load applied to the rod head 30. This load is recorded by the recording device, e.g., in the form of a diagram. During the slow up and down movement of the cross head 9 the pump 38 may easily be operated by an operator standing beside the pump 38, preferably in the lowest part of this up and down movement, by such an increment that the pressure sensing device is inserted into the force-transmitting line. The sensing device can be removed in the same manner simply by operating the cock 44 to permit the pressure liquid to drain into the reservoir 43. As a result, the cylinders 31 are lowered and the load of the pump rod 11 is directly transmitted by the sleeves 26, 26' to the cross head 9. The entire pressure sensing device can then be removed simply by an outward pivotal movement and lifting from the pins 28.

A pressure recorder is connected to the bore 47 of the piston pump 38 and comprises a pressure cylinder 50 in which a piston 51 is inserted and biased by a spring 52. A scriber 53 is pivotally mounted by a pivot 54 on a frame at its rear end and secured intermediate its ends to the piston rod 51 while its opposite end forms a point to record the prevailing pressure on a diagram sleeve 55 rotated by a pull wire 56 which is wound on the drum 56.

For this reason a single device of this kind can be used for obtaining successively a recording of the pressure curve of any desired number of deep well pumps which 'are in operation. For this purpose it is only necessary to provide in each of these pumps the rod head with the sleeve 27.

The arrangement according to this application enables also an adjustment of the altitude of the piston of the deep well pump incorporated in the well relative to the cylinder during operation. This adjustment has the purpose of eliminating certain disturbances in the operation of the deep Well pump.

While I have disclosed one embodiment of the present invention,'it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

What is claimed is:

1. In a deep well pumping installation, particularly for the pumping of oil from deep wells, the combination of a vertically reciprocating pump rod, a vertically reciproeating carrying member assuming the load from said pump rod and having a top face, means for transferring the load of said pump rod onto said carrying member during normal pumping operation and having a lower end face, said lower end face of said load transferring means abutting the top face of said carrying member, said load transferring means having at least one lateral projection, with at least one hydraulic pressure unit comprising a pressure cylinder and a piston reciprocating therein, said hydraulic pressure unit supported by said carrying member and said bottom face of said lateral projection resting on said hydraulic pressure unit in the operative position of the latter, a pump operatively connected with said pressure cylinder and feeding the latter, in order to lift said pressure cylinder and said piston, respectively, and said hydraulic pressure unit assuming the load of said pump rod, thereby lifting said lower end face of said load transferring means from said top face of said carrying member, and a pressure responsive recording member operatively connected with said hydraulic pressure unit.

2. The pumping installation, as set forth in claim 1, wherein said load transferring means comprises a member surrounding the upper end of said pump rod and having a lower end face for transfer of the load of said pump rod to said carrying member, and said member having two of said lateral projections for operative connection thereof with said hydraulic pressure unit.

3. The pumping installation, as set forth in claim 1, wherein said load transferring means includes a head rigidly secured to the upper end of said pump rod and at least one cylindrical sleeve loosely mounted on said pump rod, said cylindrical sleeve carrying said lateral projection for connection of the latter to said carrying memher.

4. In a deep well pumping installation, particularly for the pumping of oil from deep wells, the combination of a vertically reciprocating pump rod, a vertically reciproeating carrying member assuming the load from said pump rod and having a top face, means for transferring the load of said pump rod onto said carrying member during normal pumping operation and having a lower end face, said lower end face of said load transferring means abutting the top face of said carrying member, said load transferring means having at least one lateral projection, with at least one hydraulic pressure unit comprising apressure cylinder and a piston reciprocating therein, said hydraulicpressure unit engaging said pump rod and laterally removably supported by the top face of said carrying member and said bottom face of said lateral projection resting on said hydraulic pressure unit in the operative position of the latter, and a pump operatively connected with said pressure cylinder and feeding the latter in order to lift said pressure cylinder and said piston, respectively, and said hydraulic pressure unit assumingthe load of said pump rod, thereby lifting said lower end face of said load transferring means from said top face of said carrying member, and a pressure responsive recording member operatively connected with said hydraulic pressure unit.

5. In a deep well pumping installation, particularly for the pumping of oil from deep wells, the combination of a vertically reciprocating pump rod, a vertically reciprocating carrying member assuming the load from said pump rod and having a top face, means for transferring the load of said pump rod onto said carrying member during normal pumping operation and having a lower end face, said lower end face of said load transferring means abutting the top face of said carrying member, said load transferring means having at least one lateral projection, with at least one hydraulic pressure unit comprising a pressure cylinder and a piston reciprocating therein, said hydraulic pressure unit supported by said carrying member and said bottom face of said lateral projection resting on said hydraulic pressure unit in the operative position of the latter, a pump operatively connected with said pressure cylinder and feeding the latter, in order to lift said pressure cylinder and said piston, respectively, and said hydraulic pressure unit assuming the load of 1 said pump rod, thereby lifting said lower end face of said load transferring means from said top face of said carrying member, a pressure responsive recording member operatively connected with said hydraulic pressure unit, said lateral projection comprising a transversely outwardly protrudingcarrying pin attached to said load transferring means, and at least one carrying hook attached to said piston and cylinder, respectively, for hanging said cylinder and piston thereon'in order to facilitate the insertion of said hydraulic pressure unit between said carrying member and said lateral projection.

6. In a deep well pumping installation, particularly for the pumping of oil from deep wells, the combination of a vertically reciprocating pump rod, a vertically reciproeating carrying member assuming the load from said pump rod and having a top face, means for transferring the load of said pump rod onto said carrying member during normal pumping operation and having a lower end face, said lower end face of said load transferring means abutting the top face of said carrying member, said load transferring means having at least one lateral projection, with atleast one hydraulic pressure unit comprising a pressure cylinder and a piston reciprocating h e id hytlIfi-llliepressure unit supported by said carrying member and said bottom face of said lateral projection resting on said hydraulic pressure unit in the operative position of the latter, a pump operatively connected with said pressure cylinder and feeding the latter, in order to lift said pressure cylinder and said piston, respectively, and said hydraulic pressure unit assuming the load of said pump rod, thereby lifting said lower end face of said load transferring means from said top face of said carrying member, a pressure responsive recording member operatively connected with said hydraulic pressure unit, said load transferring means comprising a member surrounding the upper end of said pump rod and having a lower end face for transfer of the load of said pump rod to said carrying member, said lateral projections comprising carrying pins attached to said member surrounding said upper end of said pump rod, and two carrying hooks attached to said piston and cylinder, respectively, for hanging said cylinder With said piston thereon, in order to facilitate the insertion of said hydraulic pressure unit between said carrying member and said lateral projections.

References Cited in the file of this patent UNITED STATES PATENTS 1,091,599 Stephens ---4 Mar. 31, 1914 1,934,201 Miller Nov. 7, 1933 2,380,362 Hem July 10, 1945 2,741,915 Renken et a1. Apr. 17, 1956