CN211500946U

CN211500946U - Oil extraction pump driving device

Info

Publication number: CN211500946U
Application number: CN202020009830.1U
Authority: CN
Inventors: 丁新建; 黄万龙; 付尧; 王洋
Original assignee: Qingdao Xinsheng Petroleum Machinery Co ltd
Current assignee: Qingdao Xinsheng Petroleum Machinery Co ltd
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-09-15
Anticipated expiration: 2030-01-03

Abstract

A drive device for a production pump for driving a piston pump installed in a production well, the piston pump having a long cylindrical pump body and a plunger reciprocally movable in the pump body. This oil recovery pump drive arrangement includes: the lower end of the rigid connecting rod is connected with a plunger of the piston pump; the guide wheel is fixedly arranged above the wellhead of the oil production well; a bi-directional motor mounted near the wellhead of the production well, having a housing and an output shaft that are relatively rotatable, wherein the output shaft is non-rotatably mounted relative to the ground; and one end of the traction cable is connected with the upper end of the rigid connecting rod, and the other end of the traction cable bypasses the guide wheel, extends to the motor and is wound and fixed on the shell of the motor. The utility model discloses an anomalous design two-way motor comes the direct reel that is used as the traction cable that pulls the connecting rod to can use two-way motor to carry out the long stroke oil recovery operation of plunger in for example the series connection pump body with low stroke frequency high-efficiently, not only extension motor life is and make the device whole compacter.

Description

Oil extraction pump driving device

Technical Field

The utility model relates to a deep well of oil recovery well especially degree of depth up to kilometer is with adopting oil drive arrangement.

Background

The prior oil production well mostly adopts a common oil production device in a 'head knocking machine' form, and a driving device of the oil production well is large in size, short in stroke of an oil production pump, low in oil production efficiency and high in maintenance cost.

CN208236391U and CN201554430U, etc. have made some improvements to oil recovery devices, but there is still a problem that the devices are not compact enough, and further improvement in oil recovery efficiency is still needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an oil recovery pump drive arrangement, its compact structure and high efficiency, long service life, the maintenance cost very reduces.

According to the utility model discloses, an oil recovery pump drive arrangement is provided for the piston pump of drive installation in the oil recovery well, the piston pump has the long tube-shape pump body and at the internal reciprocating motion's of pump plunger. This oil recovery pump drive arrangement includes:

the lower end of the rigid connecting rod is connected with a plunger of the piston pump;

the guide wheel is fixedly arranged above the wellhead of the oil production well;

a bi-directional motor mounted near the wellhead of the production well, having a housing and an output shaft that are relatively rotatable, wherein the output shaft is non-rotatably mounted relative to the ground; and

and one end of the traction cable is connected with the upper end of the rigid connecting rod, and the other end of the traction cable bypasses the guide wheel, extends to the motor and is wound and fixed on the shell of the motor.

According to a preferred embodiment of the inventive pump drive, the housing of the electric motor can be constructed as a cylinder having a threaded groove in its outer surface, the threaded groove of the cylinder being adapted to receive the traction cable wound therein. The thread groove also has the function of enlarging the heat dissipation surface of the motor.

According to the utility model discloses a further preferred embodiment of production pump drive arrangement, the contained angle that tangent line traction cable and the corresponding thread groove of motor outer cylinder surface department formed is between-3 to + 3.

According to a further preferred embodiment of the inventive drive of the extraction pump the diameter of the guide wheel can be 80-110cm and the diameter of the housing of the motor can be 90-120cm, preferably both being equal, for example 100 cm. The angle formed by the traction cable and the guide pulley is preferably 45-65 °.

According to a further preferred embodiment of the inventive drive for the production pump, the motor is selected from low-speed motors, for example motors with a speed of between 1 and 10rpm, more preferably motors with a speed of between 3 and 8 rpm. The low-speed motor is selected to ensure that the speed of the whole transmission device is very low, thereby greatly reducing the failure rate of the whole device, reducing the maintenance and supporting facilities and saving the cost.

According to the utility model discloses a production pump drive arrangement, the rigidity connecting rod is preferably steel connecting rod or carbon fiber connecting rod. The connecting rod may have a diameter of 16-28 mm.

According to the utility model discloses an oil recovery pump drive arrangement, the traction cable comprises flexible metal inner core and smooth sheath. The diameter of the traction cable is preferably between 18-32 mm.

According to the oil extraction pump driving device of the utility model, the stroke of the plunger of the piston pump in the pump body is preferably not less than 10 meters, and more preferably between 30 and 70 meters.

The utility model discloses an anomalous design two-way motor comes the direct reel that is used as the traction cable of traction connecting rod to can use (only need carry out 1-10 stroke times per hour) two-way motor with the low stroke time and come to carry out the plunger high-efficiently and carry out the super long stroke (up to hectometer) oil recovery operation in for example the tandem pump body, not only extension motor life and make the whole compacter of device. In addition, because a low-rotation-speed motor is adopted and the frequency of stroke is greatly reduced, the service life of the whole device is greatly prolonged, and the maintenance cost is greatly reduced.

Drawings

Fig. 1 shows a schematic longitudinal section of a drive device for a production pump according to the invention;

fig. 2 shows a schematic structural diagram of the bidirectional motor of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that the following illustrative embodiments are provided for illustration only and not for the purpose of limiting the invention.

As shown in fig. 1, the present invention relates to a drive device for an oil recovery pump, which generally includes a connecting rod 20, a traction cable 30, a guide wheel 40, and a bidirectional motor 50.

Referring to fig. 1, the oil recovery pump of the present invention employs a piston pump installed in a vertical well pipe w of an oil recovery well, which has a long cylindrical pump 10 and a movable plunger 11 that can reciprocate up and down in the pump body 10. The depth of the well pipe w may be up to several kilometres, for example 200-. The pump body 10 may be tens or even hundreds of meters in length or height, for example 10-100 meters, typically between 30-80 meters. The pump body 10 can also consist of a plurality of piston pumps connected in series, so that the stroke of the plunger 11 is conveniently increased by a multiple. The diameter of the plunger 11 or the inner diameter of the pump body 10 is typically 5-10 cm.

The plunger 11 shown in fig. 1 is connected to the (lower end of) the connecting rod 20 and transmits upward pulling force therethrough. The connecting rod 20 is a rigid connecting rod made of steel, has a diameter of 16-28mm and can weigh several tons. The link 20 (upper end) is connected to a traction cable 30, which will be described later, through a joint 21. When the plunger 11 reaches its maximum stroke (i.e. is in the uppermost position), the upper end of the connecting rod 20 is normally located at a position near the wellhead.

With continued reference to fig. 1, the guide wheel 40 is a fixed sheave mounted on a fixed stand 41 on the ground near the wellhead of the production well, and is fixedly mounted above the wellhead of the production well at a predetermined height. The guide wheels 40 are typically 80-110cm in diameter.

As shown in fig. 1 and 2, a bi-directional motor 50 is mounted near the wellhead of the production well and has a housing 52 and an output shaft 53 that are relatively rotatable. In the present invention shown in fig. 1, the output shaft 53 is non-rotatably mounted with respect to the ground, i.e. non-rotatably or stationarily mounted on the support 51, which support 51 is in turn fixedly mounted on the ground near the wellhead. Thus, when the motor 50 is operated, the housing 52 can rotate about the shaft or output shaft 53 in either a forward or reverse direction. The motor 50 is selected to be a low speed motor with a speed of between 1 and 10rpm, more preferably between 3 and 8 rpm.

As best shown in FIG. 2, the housing 52 of the motor 50 is configured as a cylinder or drum having a diameter of between 90-120 cm. The outer circumferential surface of the housing 52 forms a threaded groove 54 for receiving the traction cable 30 therein in a wound manner while increasing the heat dissipating surface of the motor.

Returning to fig. 1, the traction cable 30 extends around the guide wheel 40 toward the motor 50 and is wound into a threaded channel 54 secured to the housing 52 of the motor 50. The included angle formed by the tangent traction cable and the corresponding thread groove on the surface of the outer cylinder of the motor is between-3 degrees and +3 degrees. The traction cable 30, which is located between the guide wheel 40 and the link 20, is substantially always on the same vertical line as the link 20. The pull cable 30 is comprised of a flexible steel wire core and a smooth resin or polymer plastic sheath, with a diameter of between 18-32 mm. The angle formed by the traction cable 30 and the guide pulley 40 is typically between 40-70 deg., such as 60 deg.. This combination of features of the traction cable 30, the guide pulley 40, and the motor 50 design may significantly facilitate efficient transfer of force and efficient use of space.

The working principle of the oil recovery pump driving device of the present invention is briefly described below.

First, the assembly is performed as shown in fig. 1. In oil production, the bi-directional motor 50 is rotated forward to wind the pull cable 30 in the threaded groove 54 of the housing 52 of the motor 50, thereby moving the connecting rod 20 and thus the plunger 11 upward until its maximum stroke, i.e., the plunger 11 is at the highest position in the pump body 10. At this point, the crude oil fills the interior cavity of the pump body 10 through an oil inlet check valve (not shown) under vacuum suction. Next, the motor 50 is reversed, i.e., the pull cable 30 is gradually disengaged from the threaded groove 54 in the housing 52 of the motor 50, and the plunger 11 is lowered to its lowest position by the weight of the link 20. At this point, the oil is discharged under pressure upwardly out of the pump body 10 through a discharge check valve (also not shown).

The utility model discloses an use above-mentioned two-way motor 50 to combine the pull cable 30 of pulling connecting rod 20 to can carry out the long stroke oil recovery operation of plunger 11 in the pump body 10 high-efficiently. The two-way motor of the utility model can perform uninterrupted oil extraction only by executing 1-10 times of stroke or (positive and negative) circulation every hour, which greatly prolongs the service life of the motor. In addition, the motor 50 using the above structure of the present invention can make the device more compact or miniaturized because the speed reduction and connection mechanism is omitted. In addition, the balance weight can be omitted by controlling the reverse rotation (rotational speed) of the bidirectional motor 50, thereby further simplifying the device structure and saving the cost.

Claims

1. A production pump driving device for driving a piston pump installed in a production well, the piston pump having a long cylindrical pump body and a plunger reciprocally movable in the pump body, characterized by comprising:

2. The drive for the mining pump of claim 1, wherein the housing of the motor is configured as a cylinder having a threaded groove on an outer surface thereof, the threaded groove of the cylinder being adapted to windingly receive the traction cable therein.

3. The drive unit for the pump according to claim 2, wherein the tangential traction cable forms an angle of-3 ° to +3 ° with the corresponding threaded groove at the outer cylindrical surface of the motor.

4. The drive for the pump of claim 1, wherein the pull cable is comprised of a flexible metal core and a smooth sheath.

5. The drive unit for the mining pump according to claim 1, wherein a stroke of a plunger of the piston pump in the pump body is not less than 10 m.

6. The drive of the mining pump according to claim 1, wherein the motor is a motor having a rotational speed of between 1 and 10 rpm.

7. The drive of the mining pump according to claim 1, wherein the motor is a motor having a rotational speed between 3-8 rpm.