CN211974943U

CN211974943U - Oil extraction equipment

Info

Publication number: CN211974943U
Application number: CN201922143480.8U
Authority: CN
Inventors: 陈桂林; 徐涛; 王海洪
Original assignee: Anhui Wuxun Technology Co ltd
Current assignee: Anhui Wuxun Technology Co ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-11-20
Anticipated expiration: 2029-12-02

Abstract

The utility model belongs to the technical field of oil extraction of oil wells, and relates to oil extraction equipment, which comprises a rectifying device, a bus assembly and at least one single-well oil extraction device, wherein the rectifying device is connected with the bus assembly connected with an external electric device, the single-well oil extraction device is connected in parallel with the bus assembly, each single-well oil extraction device comprises a drive control device internally provided with an inverter and a single-well drive device driven by the inverter, the inverter is connected in parallel with the bus assembly, the single-well drive device comprises a well mouth installation device installed at a corresponding well mouth and an underground oil pumping device arranged at the bottom end of the well mouth installation device, the single-well drive device also comprises a hollow motor vertically arranged at the well mouth installation device and electrically connected with the drive control device and a linear lifting device comprising a lifting rod, the lifting rod can lift the underground oil pumping device under the drive of the hollow motor, the, simple structure and material saving, equipment investment cost is low, and the later maintenance work load is few, and production efficiency is high and the operational safety is high.

Description

Oil extraction equipment

Technical Field

The utility model relates to an oil well oil recovery technical field especially relates to an oil recovery equipment suitable for cluster well.

Background

The cluster well is a well site or platform, and is characterized by that several or even hundreds of wells are drilled, the well heads of every well are spaced by less than several meters, and the bottom of every well is extended to different positions. Typically, a cluster well has at least the following characteristics: 1) The development speed of oil field exploration is accelerated, and the drilling cost is saved, so that certain special requirements of drilling engineering are met; 2) the method is favorable for reducing land acquisition cost, is convenient for centralized management of the oil well after well completion, reduces gathering and transportation processes, and saves the investment of manpower, financial resources, material resources and the like. With the increasing demand of petroleum in China, low-yield and low-permeability oil reservoirs become the key points for the development of various oil fields in China, so that the number of low-yield wells is increased more and more. In the low-yield well development process, the reduction of the exploitation cost is a key problem, so based on the characteristics of cluster wells, the cluster wells become the main exploitation mode of the oil field.

However, for cluster wells, the existing ground oil extraction equipment of each oil field mainly adopts a beam pumping unit, the beam pumping unit generally has a large volume, a large weight and a large power for configuring a motor, a cement foundation needs to be poured in the application, and in addition, the load of the beam pumping unit periodically fluctuates, so that a worker needs to regularly adjust the beam pumping unit according to well conditions to ensure that the beam pumping unit keeps balance in the use process. Generally, the working principle of the existing oil production equipment is complex, the size is large, the initial investment of the equipment is high, the production maintenance workload in the later period is large, and the operation efficiency is low.

Accordingly, it is desirable to provide a new type of oil recovery equipment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that the initial investment of the existing oil extraction equipment is higher, the later maintenance workload is large and the operation efficiency is low.

In order to solve the technical problem, the utility model provides an oil extraction equipment has adopted following technical scheme:

the oil recovery apparatus comprises: the rectifying device is electrically connected with the voltage transformation device and is connected with the bus assembly connected with an external electric device, and the bus assembly is used for transmitting electric energy;

the oil extraction equipment also comprises at least 1 single-well oil extraction device, the single-well oil extraction devices are electrically connected to the bus assembly in parallel, each single-well oil extraction device comprises a drive control device and a single-well drive device, and an inverter device is arranged in the drive control device; the inversion device is electrically connected to the bus assembly in parallel, and the single-well driving device is driven by the inversion device to recover oil and generate power to supply power to the external electric device through the bus assembly;

the single well driving device comprises a wellhead mounting device and an underground pumping device, the wellhead mounting device is mounted on a corresponding wellhead position, and the underground pumping device is positioned underground and arranged on the wellhead mounting device; the single-well driving device also comprises a hollow motor and a linear lifting device, and the linear lifting device is arranged on the top end of the hollow motor; the hollow motor is of a hollow structure, is vertically arranged on the top end of the wellhead installation device and is electrically connected to the driving control device;

the linear lifting device comprises a lifting rod, the lifting rod penetrates through the hollow motor, the bottom end of the lifting rod is connected with the underground oil pumping device, the lifting rod can lift the underground oil pumping device under the driving of the hollow motor to realize oil extraction, and the lifting rod can drive the hollow motor to generate electricity in a return process.

In some embodiments, the hollow motor comprises a motor stator, a hollow rotor and a wiring device, the motor stator is vertically arranged on the wellhead mounting device, the hollow rotor is rotatably inserted into the motor stator, and the wiring device is arranged on the motor stator and is electrically connected to the inverter device;

the lifting rod penetrates through the hollow rotor and can reciprocate along the axis direction of the hollow rotor.

In some embodiments, the linear lifting device further comprises a lifting nut and a roller, the lifting nut and the roller can synchronously rotate along with the hollow rotor, the lifting nut is vertically arranged at the top end of the hollow rotor, the roller is arranged in the lifting nut, the lifting rod is a lifting screw rod, and the roller is in threaded connection with the outer peripheral wall of the lifting screw rod so that the lifting screw rod can make linear motion.

In some embodiments, the center line of the lifting screw is collinear with the center line of the hollow rotor.

In some embodiments, the downhole pumping unit comprises a tubing, a pumping rod and a pumping unit, wherein the top end of the tubing is arranged on the wellhead mounting device, and the bottom end of the tubing extends to an oil layer along the corresponding wellhead; the sucker rod is vertically and sequentially inserted into the wellhead mounting device and the oil pipe, and the top end of the sucker rod is connected with the bottom end of the lifting rod so as to be capable of vertically moving in the oil pipe together with the lifting rod; the pumping device is arranged in the oil pipe and connected with the bottom end of the pumping rod and used for pumping the oil in the oil layer.

In some embodiments, a wellhead sealing device is arranged in the wellhead mounting device, and the top end of the sucker rod penetrates through the wellhead sealing device and is connected with the bottom end of the lifting rod.

In some embodiments, the pumping device comprises a mandrel disposed at the bottom end of the oil tube and a plunger disposed inside the mandrel and at the bottom end of the sucker rod.

In some embodiments, the single-well driving device further comprises an outer shell and a guiding device which moves linearly, the outer shell is vertically arranged at the top end of the motor stator, a vertical guiding groove is formed in the inner wall of the outer shell, and the guiding device is arranged on the lifting rod to prevent the lifting rod from rotating and can vertically slide along the guiding groove.

In some embodiments, the single well drive apparatus further comprises a support cylinder, one end of the support cylinder being disposed on a bottom end of the motor stator and the other end of the support cylinder being disposed on a top end of the wellhead mounting device; the bottom of lifting rod is in support section of thick bamboo in connect in through the connector the top of sucker rod.

In some embodiments, the single well driving device further includes an upper travel switch and a lower travel switch electrically connected to the driving control device, the upper travel switch is disposed on the outer casing and used for limiting the travel position of the lifting rod, and the lower travel switch is disposed on the supporting cylinder and used for limiting the return position of the lifting rod.

Compared with the prior art, the utility model provides an oil recovery equipment mainly has following beneficial effect:

(1) the oil extraction equipment utilizes the bus principle, re-generates electricity and directly inputs the electricity to a bus assembly, and supplies power to other peripheral oil extraction equipment connected with the bus assembly in parallel, so that electric energy is recycled in the whole oil extraction system, electric power balance is achieved, a balance mechanism of a traditional beam pumping unit is omitted, steel consumption is saved, initial equipment investment cost is reduced, overall structure is simplified, weight is greatly reduced, a wellhead mounting device can be directly mounted at a corresponding wellhead position, a ground foundation is omitted, equipment investment cost is further reduced, the overall structure is simplified, and later-stage production maintenance workload of the equipment is reduced; (2) the oil extraction equipment directly drives the linear lifting device through the hollow motor, has a simple transmission structure, and is beneficial to improving the production efficiency and the safety performance of equipment operation.

Drawings

In order to illustrate the solution of the present invention more clearly, the drawings needed for describing the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

fig. 1 is a schematic diagram of an embodiment of the present invention in which a production facility is deployed in a cluster well;

fig. 2 is a schematic diagram of the structure of a single well oil recovery device of the oil recovery apparatus of fig. 1.

The reference numbers in the drawings are as follows:

10. an oil recovery facility; 20. a single well oil recovery unit; 30. an oil layer; 40. a signal line; 50. a cable;

1. a voltage transformation device; 2. a rectifying device; 3. a bus bar assembly; 31. a positive bus bar; 32. a negative bus bar;

4. a drive control device; 41. an inverter device;

5. a single well drive; 51. installing a wellhead installation device; 511. a wellhead sealing device; 52. an underground oil pumping device; 521. an oil pipe; 522. a sucker rod; 523. a pumping pressure device; 5231. a working barrel; 5232. a plunger; 524. a surface casing; 53. a hollow motor; 531. a motor stator; 532. a hollow rotor; 533. a wiring device; 54. a linear lifting device; 541. lifting rods/lifting screws; 542. lifting the nut; 543. a roller; 544. a connector; 55. an outer housing; 56. a guide device/guide car; 561. fastening a nut; 57. a support cylinder; 58. an upper travel switch; 59. and a lower travel switch.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, for example, the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or position illustrated in the drawings, which are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof, in the description and claims of the invention and the above description of the drawings are intended to cover non-exclusive inclusions. In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be noted that the oil recovery apparatus 10 is primarily suitable for use in cluster wells, although in practice it may be used in other suitable applications. The oil recovery apparatus 10 is mainly used for collecting oil from an oil field, but may be used for collecting liquid such as ground water.

The embodiment of the utility model provides an oil recovery equipment 10, as shown in fig. 1, this oil recovery equipment 10 includes potential device 1, fairing 2 and generating line subassembly 3, and wherein, potential device 1 is connected with external power source (like the electric wire netting) usually, and fairing 2 passes through cable 50 electric connection potential device 1, and fairing 2 still is connected with generating line subassembly 3. Usually, the bus bar assembly 3 is connected not only to the rectifying means 2 but also to external electrical devices, it being understood that the bus bar assembly 3 is mainly used for transmitting electrical energy.

As shown in fig. 1, the oil production equipment 10 further includes at least 1 single-well oil production device 20, and the single-well oil production device 20 is electrically connected to the bus bar assembly 3 in parallel. Wherein, every single-well oil recovery device 20 includes drive control device 4 and single-well drive device 5, and drive control device 4 embeds has inverter 41, and inverter 41 connects in parallel electric connection on generating line subassembly 3. Specifically, in the present embodiment, the bus bar assembly 3 includes a positive bus bar 31 (DC +) and a negative bus bar 32(DC-), wherein, as shown in fig. 1, the positive electrode and the negative electrode of the rectifying device 2 are respectively connected to the positive bus bar 31 and the negative bus bar 32, the positive electrode of the inverter device 41 is connected in parallel to the positive bus bar 31 through a cable 50, and the negative electrode of the inverter device 41 is connected in parallel to the negative bus bar 32 through a cable 50. It is understood that the rectifying device 2 is located outside the driving control device 4, and the inverting device 41 is connected in parallel with the rectifying device 2 through the bus bar assembly 3.

In this embodiment, the single well drive unit 5 is driven by the inverter unit 41 to produce oil and generate electricity to supply electricity to external electrical devices through the bus bar assembly 3. Specifically, the single-well driving device 5 is connected with the inverter device 41 of the driving control device 4 through the cable 50, because the inverter device 41 is connected in parallel to the bus assembly 3, on one hand, the driving control device 4 can drive the single-well driving device 5 through the inverter device 41 to complete the oil extraction action; on the other hand, when the single well driving device 5 generates electricity in the return stroke of oil extraction, the electric energy can be transferred to the inverter device 41, the generated alternating current is converted into direct current through the inverter device 41, and then the direct current can be transmitted to external electric devices (such as other surrounding oil extraction equipment 10 which is connected with the oil extraction equipment 10 in parallel) connected with the direct current through the bus bar assembly 3, so that the electric energy generated by the oil extraction equipment 10 can be reused by other oil extraction equipment 10, therefore, the problem that electricity is wasted due to the fact that electricity is consumed by a brake resistor in the running process of the existing beam pumping unit is solved, the internal electricity consumption and the electricity generation of the whole cluster well production system are balanced, the electricity saving is facilitated, and the production efficiency is improved; on the other hand, the mechanical balancing device can be omitted by reusing the electric energy in the whole system, so that the whole structure of the oil extraction equipment 10 is simplified, and the initial equipment investment cost is reduced.

As can be understood from the above, the power is supplied to the transforming device 1 through the power grid, the transforming device 1 supplies power to the rectifying device 2, the rectifying device 2 supplies power to the driving control device 4 through the bus assembly 3, and the driving control device 4 supplies power to the single-well driving device 5, so as to realize the normal operation of the oil production equipment 10. In addition, in the return process, the single-well driving device 5 generates power and reversely supplies power to the driving control device 4, and the inverter device 41 of the driving control device 4 supplies power to other oil extraction equipment 10 which are connected in parallel at the periphery through the bus assembly 3, so that the power balance of the whole cluster well production system is achieved.

As shown in fig. 1 and 2, the single well driving device 5 comprises a wellhead installation device 51 and a downhole pumping device 52, wherein the wellhead installation device 51 can be directly installed at a corresponding wellhead position without drilling a ground foundation at the corresponding wellhead position. Correspondingly, the downhole pumping unit 52 is located downhole and is disposed on the wellhead installation 51. As shown in fig. 2, the single well driving device 5 further includes a hollow motor 53 and a linear lifting device 54, the linear lifting device 54 is disposed on the top end of the hollow motor 53, it can be understood that the linear lifting device 54, the hollow motor 53, the wellhead installation device 51 and the downhole pumping device 52 are sequentially arranged from top to bottom, and the wellhead installation device 51 is mainly used for installing the hollow motor 53 and the linear lifting device 54 on the well and installing the downhole pumping device 52.

As shown in fig. 2, the hollow motor 53 has a hollow structure. In addition, the hollow motor 53 is vertically disposed on the top end of the wellhead installation device 51, and is electrically connected to the inverter device 41 of the driving control device 4. As shown in fig. 2, the linear lifting device 54 includes a lifting rod 541, wherein the lifting rod 541 passes through the hollow motor 53 and has a bottom end connected to the downhole oil pumping device 52, the lifting rod 541 can lift the downhole oil pumping device 52 under the driving of the hollow motor 53 to achieve oil extraction, and the lifting rod 541 can also drive the hollow motor 53 to generate electricity in a return stroke after oil extraction is completed, and it should be noted that, in the present embodiment, the hollow motor 53 generates electricity under the gravity of the lifting rod 541 and components (such as the pumping rod 522 and the pumping device 523 described below) connected to the lifting rod 541 and performing lifting motion together with the lifting rod 541.

In summary, compared with the prior art, the oil production device 10 has at least the following beneficial effects: (1) by utilizing the bus principle, the re-power of the oil extraction equipment 10 is directly input to the bus assembly 3, so that power is supplied to other peripheral oil extraction equipment 10 connected with the bus assembly in parallel, the electric energy is recycled in the whole oil extraction system, the electric power balance is realized, a balancing mechanism of a traditional beam pumping unit is omitted, the steel consumption is saved, the initial equipment investment cost is reduced, the overall structure is simplified, the weight is greatly reduced, the wellhead mounting device 51 can be directly mounted at the opening position corresponding to a wellhead, the ground foundation is omitted, the equipment investment cost is further reduced, the overall structure is simplified, and the later-stage production maintenance workload of the equipment is reduced; (2) the linear lifting device 54 is directly driven by the hollow motor 53, the transmission structure is simple, and the production efficiency and the safety performance of equipment operation are favorably improved.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 and fig. 2.

In some embodiments, as shown in fig. 2, in order to make the hollow motor 53 be a motor or a generator, and simplify the structure of the oil extraction apparatus 10, the hollow motor 53 includes a motor stator 531, a hollow rotor 532 and a wiring device 533, wherein the motor stator 531 is vertically disposed on the wellhead mounting device 51, the hollow rotor 532 is rotatably inserted into the motor stator 531, the wiring device 533 is disposed on the motor stator 531, and the wiring device 533 is electrically connected to the inverter device 41 through a cable 50. Further, as shown in fig. 2 again, the lifting rod 541 of the linear lifting device 54 passes through the hollow rotor 532 and can interact with the hollow motor 53 to reciprocate in the axial direction of the hollow rotor 532.

In some embodiments, as shown in fig. 2, to further simplify the structure of the oil production apparatus 10, the linear lifting device 54 further includes a lifting nut 542 and a roller 543, wherein the lifting nut 542 and the roller 543 can rotate synchronously with the hollow rotor 532, specifically, the lifting nut 542 is vertically disposed at the top end of the hollow rotor 532 through a bolt, and the roller 543 is disposed in the lifting nut 542, and to improve the load-bearing capacity, the impact resistance and the safety of the apparatus as a whole, the lifting rod 541 is preferably a lifting screw 541, and the roller 543 is threadedly connected to the outer circumferential wall of the lifting screw 541 so as to convert the rotation of the roller 543 into the linear motion of the lifting screw 541. The center line of the lifting screw 541 is generally aligned with the center line of the hollow rotor 532, so that the oil extraction device 10 can move more smoothly and safely.

It is understood that, in the present embodiment, the lifting nut 542 is a hollow structure, and the lifting nut 542, the rollers 543 and the lifting screw 541 are sequentially disposed from outside to inside. Specifically, in the present embodiment, a plurality of rollers 543 are provided on the inner wall of the lift nut 542, and each roller 543 is screwed to the lift screw 541 on the outer peripheral wall of the lift screw 541. With this configuration, the rotary motion of the hollow motor 53 can be converted into the upward lifting motion of the lifting rod 541 (e.g., lifting screw), or the linear motion of the lifting rod 541 can be converted into the rotary motion of the hollow motor 53, thereby generating power.

In some embodiments, as shown in fig. 2, the single-well driving device 5 further includes an outer housing 55 and a guiding device 56 moving linearly, wherein the outer housing 55 is vertically disposed at a top end of the motor stator 531, and a vertical guiding groove (not shown) is formed on an inner wall of the outer housing 55, and understandably extends along an axial direction of the lifting rod 541; the guide 56 is provided on the lifting rod 541 to prevent the lifting rod 541 from rotating, and can slide vertically along the guide groove.

Specifically, in this embodiment, the guiding device 56 is a guiding cart, the guiding cart 56 is fixedly connected to the lifting screw 541 through a fastening nut 561, and the guiding cart 56 is connected to the outer housing 55. More specifically, the guide car 56 has a plurality of rollers (not shown), each of which is inserted into and slidable along a guide groove in the guide groove, thereby coupling the guide car 56 to the outer housing 55 and ensuring that the lift screw 541 does not rotate. Of course, in practice, the guide device 56 may have other suitable structures as long as it can limit the rotation of the lifting screw 541 and ensure that the lifting screw 541 can slide along the guide groove.

As can be understood from the above, in the present embodiment, the working principle of the linkage of the air-core motor 53 and the linear lifting device 54 is substantially as follows: the driving control device 4 sends an electrical signal to the wiring device 533 on the motor stator 531 through the inverter device 41 according to the requirement of oil extraction speed, etc. to drive the motor stator 531 to generate a rotating magnetic field, under the action of the rotating magnetic field, the hollow rotor 532 can rotate clockwise, and in the rotating process of the hollow rotor 532, the lifting nut 542 and the roller 543 mounted on the hollow rotor 532 can be driven to rotate synchronously, so that the guide car 56 can only slide along the guide slot, and the lifting screw 541 is fixedly connected with the guide car 56, therefore, the rotation of the roller 543 can be converted into the linear motion of the lifting screw 541 along the guide slot.

Overall, by combining the hollow motor 53 with the linear lifting device 54, the structure of the ground transmission part of the oil extraction equipment 10 is simplified, and correspondingly, the weight of the whole machine is further greatly reduced without ground foundation; in addition, since the surface of the ground portion of the oil recovery apparatus 10 has no movable parts, the overall operation is relatively simple, the safety and reliability are high, and the improvement of the production efficiency is facilitated.

In some embodiments, as shown in fig. 2, the downhole pumping unit 52 comprises a tubing 521, a pumping rod 522 and a pumping unit 523, wherein the top end of the tubing 521 is disposed on the wellhead mounting device 51, and the bottom end extends to the oil layer 30 along the corresponding wellhead; the sucker rod 522 is vertical and is pegged graft in well head installation device 51 and oil pipe 521 in order, and the bottom of rod 541 is connected to the top of sucker rod 522 to can lift rod 541 together vertical removal in oil pipe 521. As can be appreciated, the outer diameter of sucker rod 522 is less than the inner diameter of oil pipe 521, and the lower portion of sucker rod 522 is located within oil pipe 521. It should be noted that, in general, in order to protect oil pipe 521, a surface casing 524 is further sleeved outside oil pipe 521, a top end of surface casing 524 is disposed on wellhead installation device 51, and a length of surface casing 524 is greater than or equal to a length of oil pipe 521.

As further shown in fig. 2, a pumping device 523 is disposed in the oil pipe 521 and connected to the bottom end of the pumping rod 522 for pumping oil of the oil layer 30. Specifically, in the present embodiment, the pumping device 523 includes a barrel 5231 and a plunger 5232, wherein the barrel 5231 is disposed at the bottom end of the oil pipe 521 through a threaded connection, and generally, an oil inlet hole (not shown) is formed in a peripheral wall or the bottom end of the barrel 5231; the plunger 5232 is located inside the barrel 5231 and is disposed at the bottom end of the sucker rod 522.

It can be understood that, because the top end of the pumping rod 522 is connected to the bottom end of the lifting screw 541, the lifting screw 541 can move linearly in conjunction with the pumping rod 522 and the plunger 5232 while the hollow motor 53 drives the lifting screw 541 to move linearly, so as to achieve oil recovery, and in general, the transmission part of the oil recovery apparatus 10 has a simple structure and high transmission efficiency. It should be noted that, in this embodiment, the wellhead installation device 51 and the downhole pumping device 52 may adopt the existing corresponding structures, but when the wellhead installation device 51 is installed, the ground foundation is not needed, and of course, an improved structure may also be adopted.

In some embodiments, as shown in FIG. 2, to ensure the sealing of the wellhead to increase the production rate, a wellhead sealing device 511 is disposed in the wellhead installation device 51 by a threaded connection. Wherein the top end of the pumping rod 522 passes through the wellhead sealing device 511 to be connected with the bottom end of the lifting rod 541. It should be noted that, considering the depth of the well, it is usually necessary to have a plurality of sucker rods 522 running end to the bottom of the well.

In some embodiments, as shown in fig. 2, in order to adjust the overall height of the oil production device 10, the single well driving device 5 further includes a supporting cylinder 57, one end (e.g., the top end) of the supporting cylinder 57 is disposed on the bottom end of the motor stator 531, and the other end (e.g., the bottom end) is disposed on the top end of the wellhead mounting device 51, specifically, the bottom end of the supporting cylinder 57 is connected by a flange, and the supporting cylinder is fixedly bolted to the wellhead mounting device 51. As further shown in FIG. 2, the bottom end of the lift rod 541 is connected to the top end of the sucker rod 522 within the support cylinder 57 by a connector 544.

In some embodiments, as shown in fig. 2, the single well drive unit 5 further includes an up travel switch 58 and a down travel switch 59 electrically connected to the drive control unit 4. Specifically, in the present embodiment, the up-stroke switch 58 is disposed on the outer housing 55, is in signal connection with the driving control device 4 through the signal line 40, and is used for limiting the forward stroke position of the lifting rod 541 (i.e. the upper limit position of the upward movement of the lifting rod 541); correspondingly, the down-stroke switch 59 is disposed on the support cylinder 57, is in signal connection with the drive control device 4 through the signal line 40, and is used for limiting the return position of the lifting rod 541 (i.e., the lower limit position of the downward movement of the lifting rod 541).

In summary, it can be understood that the main features of the oil production device 10 include at least the following: the oil extraction equipment 10 belongs to electric power balance reciprocating type lifting oil extraction equipment 10, is suitable for application scenes with low yield, has a simple integral structure, does not need ground foundation, has high operation safety, high production efficiency, easy maintenance and low equipment investment cost, is favorable for shortening the economic recovery period, and can be widely popularized and applied.

In addition, the general operating principle of the oil production installation 10 is substantially as follows:

(1) in the going stroke (i.e. the up stroke), the external power grid supplies power to the transformer 1, the transformer 1 supplies power to the rectifier 2, the rectifier 2 supplies power to the driving control device 4 through the bus assembly 3, the driving control device 4 is electrically connected with the wiring device 533 through the inverter 41 to drive the motor stator 531 to generate a rotating magnetic field, the hollow rotor 532 rotates clockwise under the action of the rotating magnetic field, and simultaneously drives the lifting nut 542 and the rollers 543 to rotate synchronously, the rotation of the hollow rotor 532 is converted into the upward linear motion of the lifting rod 541 through the threaded connection of the rollers 543 and the lifting rod 541 (specifically, the lifting rod 541) so that the pumping rod 522 also moves upward under the linkage of the lifting rod 541, and meanwhile, the pumping rod 522 linkage plunger 5232 moves upward linearly in the working cylinder 5231, so that the oil in the oil layer 30 can be pumped into the pumping rod 522 and the oil pipe 521, so as to finally collect the oil of the oil layer to the ground;

when the lifting rod 541 triggers the upper travel switch 58, the upper travel switch 58 transmits a switching signal to the driving control device 4 through the signal line 40, and the driving control device 4 drives the motor stator 531 through the inverter to generate a reverse rotating magnetic field according to needs so as to promote the hollow rotor 532 to decelerate until stopping, so that an oil extraction process can be completed;

(2) in the return stroke (i.e. down stroke) part, when the hollow rotor 532 stops moving, the lifting screw 541 also stops lifting the sucker rod 522 and the plunger 5232, but immediately under the gravity action of the plunger 5232, the sucker rod 522 and the lifting screw 541, the plunger 5232, the sucker rod 522 and the lifting screw 541 move downwards together, and the lifting screw 541 drives the roller 543, the lifting nut 542 and the hollow rotor 532 to rotate anticlockwise, at this time, the load drives the hollow motor 53 to rotate, so that the hollow motor 53 can be used as a generator to generate electricity for the driving control device 4, specifically, because the driving control device 4 is internally provided with the inverter device 41, the alternating current generated by the hollow motor 53 can be converted into direct current through the inverter device 41, and the direct current is transmitted to other surrounding oil production equipment 10 connected with the oil production equipment 10 in parallel through the bus assembly 3, the power generation and reutilization is completed, and the power balance is realized;

when the lifting rod 541 triggers the down stroke switch 59, the down stroke switch 59 transmits a switching signal to the driving control device 4 through the signal line 40, the driving control device 4 drives the motor stator 531 through the inverter to generate a reverse rotating magnetic field according to needs so as to promote the hollow rotor 532 to decelerate until stopping, so that a power generation process can be completed, and all parts of the oil extraction equipment 10 return to an initial state to prepare for entering the next circulating oil extraction process;

therefore, the oil extraction can be realized by sequentially executing the up stroke and the down stroke and circularly executing the steps of the up stroke and the down stroke.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An oil extraction device (10), characterized in that the oil extraction device (10) comprises a transformer (1), a rectifier (2) and a bus assembly (3), the rectifier (2) is electrically connected to the transformer (1) and connected to the bus assembly (3) connected to an external electrical device, the bus assembly (3) is used for transmitting electrical energy;

the oil extraction equipment (10) further comprises at least 1 single-well oil extraction device (20), the single-well oil extraction devices (20) are electrically connected to the bus assembly (3) in parallel, each single-well oil extraction device (20) comprises a driving control device (4) and a single-well driving device (5), and an inverter device (41) is arranged in the driving control device (4); the inverter device (41) is electrically connected to the bus assembly (3) in parallel, the single-well driving device (5) is driven by the inverter device (41) to recover oil and generate electricity to supply power to the external electric device through the bus assembly (3);

the single well driving device (5) comprises a wellhead mounting device (51) and a downhole pumping device (52), the wellhead mounting device (51) is mounted on a corresponding wellhead position, and the downhole pumping device (52) is located underground and arranged on the wellhead mounting device (51); the single-well driving device (5) further comprises a hollow motor (53) and a linear lifting device (54), wherein the linear lifting device (54) is arranged at the top end of the hollow motor (53); the hollow motor (53) is of a hollow structure, is vertically arranged at the top end of the wellhead installation device (51) and is electrically connected to the driving control device (4);

the linear lifting device (54) comprises a lifting rod (541), the lifting rod (541) penetrates through the hollow motor (53) and the bottom end of the lifting rod is connected with the underground oil pumping device (52), the lifting rod (541) can be driven by the hollow motor (53) to lift the underground oil pumping device (52) so as to realize oil extraction, and can drive the hollow motor (53) to generate electricity in a return stroke.

2. The oil recovery apparatus (10) of claim 1 wherein said hollow motor (53) comprises a motor stator (531), a hollow rotor (532) and a wiring device (533), said motor stator (531) is vertically disposed on said wellhead mounting device (51), said hollow rotor (532) is rotatably inserted into said motor stator (531), said wiring device (533) is disposed on said motor stator (531) and electrically connected to said inverter device (41);

the lifting rod (541) penetrates through the hollow rotor (532) and can reciprocate along the axial direction of the hollow rotor (532).

3. The oil recovery apparatus (10) of claim 2 wherein said linear lift device (54) further comprises a lift nut (542) and a roller (543) capable of synchronously rotating with said hollow rotor (532), said lift nut (542) is vertically disposed at the top end of said hollow rotor (532), said roller (543) is disposed in said lift nut (542), said lift rod (541) is a lift screw (541), said roller (543) is threadedly connected to the outer peripheral wall of said lift screw (541) to make said lift screw (541) move linearly.

4. The oil recovery plant (10) according to claim 3, characterized in that the centre line of the lifting screw (541) and the centre line of the hollow rotor (532) are located on the same line.

5. The oil recovery apparatus (10) according to any of claims 2 to 4, wherein said downhole pumping device (52) comprises an oil pipe (521), a pumping rod (522) and a pumping device (523), the top end of said oil pipe (521) being arranged on said wellhead mounting device (51) and the bottom end extending along the corresponding wellhead to an oil reservoir (30); the sucker rod (522) is vertically and sequentially inserted into the wellhead installation device (51) and the oil pipe (521), and the top end of the sucker rod (522) is connected with the bottom end of the lifting rod (541) so as to be capable of vertically moving in the oil pipe (521) together with the lifting rod (541); the pumping device (523) is arranged in the oil pipe (521) and connected with the bottom end of the sucker rod (522) and used for pumping the oil of the oil layer (30).

6. The oil recovery installation (10) according to claim 5, characterized in that a wellhead sealing device (511) is arranged in the wellhead mounting device (51), and the top end of the sucker rod (522) is connected with the bottom end of the lifting rod (541) through the wellhead sealing device (511).

7. The oil recovery apparatus (10) of claim 5 wherein the pumping device (523) comprises a barrel (5231) and a plunger (5232), the barrel (5231) being disposed at the bottom end of the oil pipe (521), the plunger (5232) being located inside the barrel (5231) and disposed at the bottom end of the sucker rod (522).

8. The oil recovery apparatus (10) of claim 5, wherein the single well driving device (5) further comprises an outer housing (55) and a guiding device (56) moving linearly, the outer housing (55) is vertically disposed on the top end of the motor stator (531), a vertical guiding groove is disposed on the inner wall of the outer housing (55), and the guiding device (56) is disposed on the lifting rod (541) to prevent the lifting rod (541) from rotating and can slide vertically along the guiding groove.

9. The oil recovery installation (10) according to claim 8, characterized in that the single well drive means (5) further comprises a support cylinder (57), one end of the support cylinder (57) being arranged on the bottom end of the motor stator (531) and the other end being arranged on the top end of the wellhead mounting means (51); the bottom end of the lifting rod (541) is connected to the top end of the sucker rod (522) through a connector (544) in the supporting cylinder (57).

10. The oil recovery apparatus (10) of claim 9, wherein the single well driving device (5) further comprises an upper travel switch (58) and a lower travel switch (59) electrically connected to the driving control device (4), the upper travel switch (58) being disposed on the outer housing (55) for limiting the forward travel position of the lifting rod (541), and the lower travel switch (59) being disposed on the supporting cylinder (57) for limiting the backward travel position of the lifting rod (541).