CN110863804B - Oil extraction equipment - Google Patents
Oil extraction equipment Download PDFInfo
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- CN110863804B CN110863804B CN201911214650.5A CN201911214650A CN110863804B CN 110863804 B CN110863804 B CN 110863804B CN 201911214650 A CN201911214650 A CN 201911214650A CN 110863804 B CN110863804 B CN 110863804B
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- 238000000605 extraction Methods 0.000 title claims abstract description 58
- 238000005086 pumping Methods 0.000 claims abstract description 49
- 238000009434 installation Methods 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 14
- 230000033001 locomotion Effects 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000003129 oil well Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 19
- 230000009471 action Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention belongs to the technical field of oil well oil extraction, 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 devices are connected in parallel with the bus assembly, each single-well oil extraction device comprises a drive control device internally provided with an inversion device and a single-well driving device driven by the inversion device, the inversion device is connected in parallel with the bus assembly, the single-well driving device comprises a wellhead mounting device arranged at a corresponding wellhead and an underground oil pumping device arranged at the bottom end of the wellhead mounting device, the single-well driving device also comprises a hollow motor vertically arranged at the wellhead mounting device and electrically connected with the drive control device and a linear lifting device comprising a lifting rod, and the lifting rod can lift the underground oil pumping device under the drive of the hollow motor.
Description
Technical Field
The invention relates to the technical field of oil well oil extraction, in particular to oil extraction equipment suitable for a cluster well.
Background
Aiming at cluster wells, the existing ground oil extraction equipment of each oil field mainly adopts a beam pumping unit, the beam pumping unit is large in size and weight, the power for configuring a motor is large, a cement foundation is required to be poured in the application, and in addition, the load of the beam pumping unit can have periodic fluctuation, so that staff can regularly adjust the beam pumping unit according to the well condition to ensure that the beam pumping unit is balanced. Generally, the working principle of the existing oil extraction equipment is complex, the volume is large, the initial investment of the equipment is high, the production and maintenance workload in the later period is also large, and the operation efficiency is low.
Accordingly, there is a need to provide a new oil recovery apparatus.
Disclosure of Invention
The invention aims to solve the technical problems of higher initial investment, large later maintenance workload, low operation efficiency and the like of the existing oil extraction equipment.
In order to solve the technical problems, the invention provides oil extraction equipment, which adopts the following technical scheme:
The oil extraction equipment comprises: the device comprises a voltage transformation device, a rectifying device and a bus assembly, wherein 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 further comprises at least 1 single-well oil extraction device, wherein 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 single well driving device is driven by the inversion device to recover oil and can generate electricity to supply power to the external electric device through the bus assembly;
the single-well driving device comprises a wellhead installation device and an underground oil pumping device, wherein the wellhead installation device is installed at a corresponding wellhead position, and the underground oil pumping device is positioned underground and arranged on the wellhead installation device; the single well driving device further 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 at the top end of the wellhead installation device and is electrically connected with the drive 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 so as to realize oil extraction, and the lifting rod can drive the hollow motor to generate electricity in the return stroke.
In some embodiments, the hollow motor comprises a motor stator, a hollow rotor and a wiring device, wherein the motor stator is vertically arranged on the wellhead installation device, the hollow rotor is rotationally inserted into the motor stator, and the wiring device is arranged on the motor stator and is electrically connected with the inversion 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, and the roller is in threaded connection with the peripheral wall of the lifting screw so as to enable the lifting screw to do linear motion.
In some embodiments, the centerline of the lift screw is collinear with the centerline of the hollow rotor.
In some embodiments, the downhole pumping device comprises an oil pipe, a pumping rod and a pumping device, wherein the top end of the oil pipe is arranged on the wellhead mounting device, and the bottom end of the oil pipe extends to an oil layer along the corresponding wellhead; the sucker rod is vertically and sequentially inserted into the wellhead installation 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 vertically move 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 sucker rod and used for pumping oil in the oil layer.
In some embodiments, a wellhead sealing device is disposed within the wellhead mounting device, and the top end of the sucker rod is connected to the bottom end of the lifting rod through the wellhead sealing device.
In some embodiments, the pumping device includes a mandrel disposed at the bottom end of the tubing and a plunger disposed within the mandrel and disposed 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 so as to prevent the lifting rod from rotating and vertically sliding along the guiding groove.
In some embodiments, the single well drive device further comprises a support cylinder, one end of the support cylinder is arranged on the bottom end of the motor stator, and the other end of the support cylinder is arranged on the top end of the wellhead installation device; the bottom of the lifting rod is connected with the top of the sucker rod in the supporting cylinder through a connector.
In some embodiments, the single well driving device further comprises an upper travel switch and a lower travel switch electrically connected to the driving control device, wherein the upper travel switch is arranged on the outer shell and used for limiting the travel position of the lifting rod, and the lower travel switch is arranged on the supporting cylinder and used for limiting the travel position of the lifting rod.
Compared with the prior art, the oil extraction equipment provided by the invention has the following main beneficial effects:
(1) The oil extraction equipment directly inputs the re-generated electricity to the bus assembly by utilizing the bus principle, so as to supply power to other peripheral oil extraction equipment connected with the bus assembly in parallel, realize the reutilization of electric energy in the whole oil extraction system, achieve electric power balance, save a balance mechanism of the traditional beam pumping unit, firstly save steel consumption, facilitate reducing the initial equipment investment cost, secondly simplify the integral structure, greatly reduce the weight, directly install a wellhead installation device at a corresponding wellhead position, save the ground foundation, further reduce the equipment investment cost, simplify the integral structure and facilitate reducing the production maintenance workload of the later stage of the equipment; (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 more clearly illustrate the solution of the present invention, a brief description will be given below of the drawings required for the description of the embodiments, it being obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of an oil recovery apparatus for centralized application in a cluster well in accordance with one embodiment of the present invention;
Fig. 2 is a schematic diagram of the construction of a single well production unit of the production apparatus of fig. 1.
The reference numerals in the drawings are as follows:
10. Oil extraction equipment; 20. a single well oil recovery device; 30. an oil layer; 40. a signal line; 50. a cable;
1. a voltage transformation device; 2. a rectifying device; 3. a busbar assembly; 31. a positive electrode bus; 32. a negative electrode bus;
4. a drive control device; 41. an inverter device;
5. A single well drive; 51. 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 device; 5231. a working cylinder; 5232. a plunger; 524. a surface layer sleeve; 53. a hollow motor; 531. a motor stator; 532. a hollow rotor; 533. a wiring device; 54. a linear lifting device; 541. lifting rod/lifting screw; 542. lifting the nut; 543. a roller; 544. a connector; 55. an outer housing; 56. a guide/trolley; 561. a fastening nut; 57. a support cylinder; 58. an upper travel switch; 59. and a down 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 terms used in the specification are used herein for the purpose of describing particular embodiments only and are not intended to limit the present invention, for example, the orientations or positions indicated by the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are orientations or positions based on the drawings, which are merely for convenience of description and are not to be construed as limiting the present invention.
The terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. In the description of the invention and the claims and 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 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, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
It should be noted that the oil extraction apparatus 10 is mainly applicable to cluster wells, and of course, may be used in other suitable applications. In addition, the oil recovery apparatus 10 is mainly used for collecting oil in an oil field, and of course, may be used for collecting liquids such as groundwater.
The embodiment of the invention provides an oil extraction device 10, as shown in fig. 1, the oil extraction device 10 includes a voltage transformation device 1, a rectifying device 2 and a bus assembly 3, wherein the voltage transformation device 1 is usually connected with an external power source (such as a power grid), the rectifying device 2 is electrically connected with the voltage transformation device 1 through a cable 50, and the rectifying device 2 is also connected with the bus assembly 3. In general, the bus bar assembly 3 is connected not only to the rectifying device 2 but also to an external electric device, and it is understood that the bus bar assembly 3 is mainly used for transmitting electric power.
As shown in fig. 1, the production apparatus 10 further comprises at least 1 single well production device 20, the single well production devices 20 being electrically connected in parallel to the busbar assembly 3. Each single-well oil extraction device 20 comprises a driving control device 4 and a single-well driving device 5, wherein an inverter device 41 is arranged in the driving control device 4, and the inverter devices 41 are electrically connected to the bus assembly 3 in parallel. Specifically, in the present embodiment, the bus assembly 3 includes a positive bus 31 (dc+) and a negative bus 32 (DC "), wherein, as shown in fig. 1, the positive and negative poles of the rectifying device 2 are respectively connected to the positive bus 31 and the negative bus 32, the positive pole of the inverter 41 is connected in parallel to the positive bus 31 through a cable 50, and the negative pole of the inverter 41 is connected in parallel to the negative bus 32 through a cable 50. It will be appreciated that the rectifying device 2 is located outside the drive control device 4, and that the inverter device 41 and the rectifying device 2 are connected in parallel by the bus bar assembly 3.
In the present embodiment, the single well driving device 5 is driven by the inverter device 41 to recover oil and can generate electricity to supply power to external electric 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 with the bus bar assembly 3, so that, on one hand, the driving control device 4 can drive the single well driving device 5 through the inverter device 41 to complete oil extraction action; on the other hand, when the single well driving device 5 generates electricity in the oil recovery return process, the electric energy can be transferred to the inverter 41, the generated alternating current is converted into direct current through the inverter 41, and then the direct current can be transmitted to external electric devices (such as other oil recovery devices 10 around which are connected with the oil recovery device 10 in parallel through the bus assembly 3), so that the electric energy generated by the oil recovery device 10 can be reused by the other oil recovery devices 10, the problem that the electric energy is wasted due to the fact that the electric energy is consumed by a braking resistor in the running process of the existing beam pumping unit is solved, the internal electricity utilization and the electric energy generation of the whole cluster well production system are balanced, electric energy is saved, and the production efficiency is improved; on the other hand, by reusing the electric energy in the whole system, the mechanical balancing device can be omitted, and thus, it is advantageous to simplify the overall structure of the oil production apparatus 10 and reduce the initial equipment investment cost.
As can be appreciated from the above, the power is supplied to the transformer device 1 through the power grid, the transformer 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 that the normal operation of the oil extraction equipment 10 is realized. In addition, during the return, the single well driving device 5 generates electricity 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 devices 10 connected in parallel around the bus assembly 3, so that the electric 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 oil pumping device 52, wherein the wellhead installation device 51 can be directly installed on a corresponding wellhead position without making a ground foundation on the wellhead corresponding position. Correspondingly, the downhole pumping unit 52 is located downhole and is disposed on the wellhead mounting unit 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 is understood that the linear lifting device 54, the hollow motor 53, the wellhead mounting device 51 and the downhole pumping device 52 are sequentially arranged from top to bottom, and the wellhead mounting device 51 is mainly used for mounting the hollow motor 53 and the linear lifting device 54 on a well and mounting the downhole pumping device 52 on a well.
As further 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 drive control device 4. As shown in fig. 2, the linear lifting device 54 includes a lifting rod 541, where the lifting rod 541 passes through the hollow motor 53 and the bottom end is connected to the downhole pumping device 52, and the lifting rod 541 can lift the downhole pumping device 52 under the driving of the hollow motor 53 to realize oil extraction, and the lifting rod 541 can drive the hollow motor 53 to generate electricity in a return process after oil extraction is completed, and in this embodiment, the hollow motor 53 realizes electricity generation under the gravity action of the lifting rod 541 and components (such as a pumping rod 522 and a pumping device 523 described below) connected to the lifting rod 541 and performing lifting movement together with the lifting rod 541.
In summary, compared with the prior art, the oil recovery apparatus 10 has at least the following advantages: (1) The bus principle is utilized to directly input the re-electricity of the oil extraction equipment 10 to the bus assembly 3, so that other oil extraction equipment 10 connected in parallel with the bus assembly is supplied with electricity, electric energy is reused in the whole oil extraction system, electric power balance is realized, a balance mechanism of the traditional beam pumping unit is omitted, firstly steel consumption is saved, initial equipment investment cost is reduced, secondly the whole structure is simplified, weight is greatly reduced, a wellhead mounting device 51 can be directly mounted at an opening position corresponding to a wellhead, the ground foundation is omitted, the equipment investment cost is further reduced, the whole structure is simplified, and the later production and maintenance workload of the equipment is reduced; (2) The linear lifting device 54 is directly driven by the hollow motor 53, so that the transmission structure is simple, and the production efficiency and the safety performance of equipment operation are improved.
In order to better understand the solution of the present invention by those skilled in the art, the following description will clearly and completely describe the solution of the embodiment of the present invention with reference to fig. 1 and 2.
In some embodiments, as shown in fig. 2, to make the hollow motor 53 be either 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, where the motor stator 531 is vertically disposed on the wellhead mounting device 51, the hollow rotor 532 is rotationally plugged 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 the cable 50. In addition, as also shown in fig. 2, 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 extraction 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, the roller 543 is disposed in the lifting nut 542, and in order to improve the bearing capacity, the impact resistance and the overall safety performance of the apparatus, the lifting rod 541 is preferably a lifting screw, and the roller 543 is screwed on the peripheral 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. Wherein the center line of the lifting screw 541 is generally in the same line with the center line of the hollow rotor 532, so that the oil production apparatus 10 moves more smoothly and with higher safety.
It can be understood that in the present embodiment, the lifting nut 542 has a hollow structure, and the lifting nut 542, the roller 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 structure, the rotational movement of the hollow motor 53 can be converted into the upward lifting movement of the lifting rod 541 (e.g., the lifting screw), or the linear movement of the lifting rod 541 can be converted into the rotational movement of the hollow motor 53, thereby generating electricity.
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 that performs a linear motion, where the outer housing 55 is vertically disposed at the 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 it is understood that the guiding groove extends along the 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 to be vertically slidable along the guide groove.
In the present embodiment, the guiding device 56 is a guiding carriage, the guiding carriage 56 is fixedly connected with the lifting screw 541 by a fastening nut 561, and the guiding carriage 56 is connected to the outer housing 55. More specifically, the guide carriage 56 has a plurality of rollers (not shown) each of which is embedded in and slides along the guide groove, thereby connecting the guide carriage 56 to the outer case 55 and ensuring that the lifting screw 541 does not rotate. In practice, of course, the guide 56 may take other suitable configurations, provided that the rotation of the lift screw 541 is restricted and that the lift screw 541 is ensured to slide along the guide slot.
As can be understood from the above, in the present embodiment, the working principle of the linkage of the hollow motor 53 and the linear lifting device 54 is approximately as follows: the driving control device 4 sends an electric signal to the wiring device 533 on the motor stator 531 through the inverter device 41 according to the oil extraction speed and other requirements, so as 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, and the guide carriage 56 can only slide along the guide groove, and the lifting screw 541 is fixedly connected with the guide carriage 56, so that the rotation of the roller 543 can be converted into the linear motion of the lifting screw 541 along the guide groove.
In general, by combining the hollow motor 53 with the linear lifting device 54, the structure of the ground transmission part of the oil extraction device 10 is simplified, and correspondingly, the weight of the whole machine is further greatly reduced without a ground foundation; in addition, since the surface of the ground portion of the oil extraction apparatus 10 has no movable parts, the overall operation is relatively simple, and the safety and reliability are high, which is advantageous for improving the production efficiency.
In some embodiments, as shown in FIG. 2, the downhole pumping device 52 includes a tubing 521, a sucker rod 522, and a pumping device 523, wherein the top end of the tubing 521 is disposed on the wellhead mounting device 51 and the bottom end extends along the corresponding wellhead to the reservoir 30; the sucker rod 522 is vertically inserted in the wellhead installation device 51 and the oil pipe 521 in sequence, and the top end of the sucker rod 522 is connected to the bottom end of the lifting rod 541 so as to be capable of moving vertically in the oil pipe 521 together with the lifting rod 541. It will be appreciated that the outside diameter of the sucker rod 522 is smaller than the inside diameter of the oil pipe 521, and that the lower portion of the sucker rod 522 is located within the oil pipe 521. In general, to protect the oil pipe 521, a surface casing 524 is further sleeved outside the oil pipe 521, the top end of the surface casing 524 is disposed on the wellhead installation device 51, and the length of the surface casing 524 is greater than or equal to the length of the oil pipe 521.
As further shown in fig. 2, a pumping device 523 is disposed within tubing 521 and is coupled to the bottom end of sucker rod 522 for pumping oil from reservoir 30. Specifically, in this embodiment, the pumping device 523 includes a working cylinder 5231 and a plunger 5232, where the working cylinder 5231 is disposed at the bottom end of the oil pipe 521 through a threaded connection, and typically, an oil inlet (not shown) is formed on a peripheral wall or bottom end of the working cylinder 5231; the plunger 5232 is located inside the barrel 5231 and is disposed at the bottom end of the sucker rod 522.
As can be appreciated, since the top end of the sucker rod 522 is connected to the bottom end of the lifting screw 541, the lifting screw 541 can link the sucker rod 522 and the plunger 5232 to perform linear motion together while the hollow motor 53 drives the lifting screw 541 to perform linear motion, so as to realize oil extraction, and overall, the transmission part of the oil extraction 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 have existing corresponding structures, but when the wellhead installation device 51 is installed, a ground foundation is not needed any more, and of course, an improved structure may be adopted.
In some embodiments, as shown in FIG. 2, to ensure tightness of the wellhead to increase production rates, wellhead seals 511 are provided in the wellhead installation 51 by threaded connections. Wherein the top end of sucker rod 522 is connected to the bottom end of lifting rod 541 through wellhead seal 511. It should be noted that, considering the deep depth of the well, it is generally necessary to have a plurality of sucker rods 522 connected end to end until reaching the bottom of the well.
In some embodiments, as shown in fig. 2, to facilitate adjusting the overall height of the oil production apparatus 10, the single well driving device 5 further includes a support tube 57, where one end (e.g., top end) of the support tube 57 is disposed on the bottom end of the motor stator 531, and the other end (e.g., bottom end) is disposed on the top end of the wellhead installation device 51, specifically, the bottom end of the support tube 57 is connected by a flange, and is fixedly disposed on the wellhead installation device 51 by bolts. As further shown in fig. 2, the bottom end of the lifting rod 541 is connected to the top end of the sucker rod 522 by a connector 544 in the support cylinder 57.
In some embodiments, as shown in fig. 2, the single well drive device 5 further includes an up travel switch 58 and a down travel switch 59 electrically connected to the drive control device 4. Specifically, in this embodiment, the upper travel switch 58 is disposed on the outer casing 55, and is connected to the driving control device 4 through the signal line 40, so as to limit the travel position of the lifting rod 541 (i.e., the upper limit position where the lifting rod 541 moves upward); correspondingly, the lower travel switch 59 is disposed on the support tube 57, and is connected to the drive control device 4 through a signal line 40, for limiting the return position of the lifting rod 541 (i.e., the lower limit position where the lifting rod 541 moves downward).
As will be appreciated, the main features of the oil recovery apparatus 10 include at least the following: the oil extraction equipment 10 belongs to the reciprocating lifting oil extraction equipment 10 with balanced electric power, is relatively suitable for low-yield application scenes, has a simple integral structure, does not need a ground foundation, has high operation safety, high production efficiency, is easy to maintain, has low equipment investment cost, is favorable for shortening the economic recovery period, and can be widely popularized and applied.
In addition, the general principle of operation of the oil recovery apparatus 10 is generally as follows:
(1) In the forward (i.e. up-stroke) section, the external power grid supplies power to the transformer 1, the transformer 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, the driving control device 4 is electrically connected with the wiring device 533 through the inverter 41, so as 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, meanwhile, the lifting nut 542 and the roller 543 are driven to rotate synchronously, the rotation of the hollow rotor 532 is converted into upward linear motion of the lifting rod 541 through the threaded connection of the roller 543 and the lifting rod 541 (particularly the lifting screw 541), so that under the linkage of the lifting rod 541, the pumping rod 522 moves upward, and meanwhile, the pumping rod 522 is linked with the plunger 5232 to move upward linearly in the working cylinder 5231, so that oil in the oil layer 30 can be pumped into the pumping rod 522 and the oil pipe 521, and finally oil in the oil layer can be collected on the ground;
When the lifting rod 541 triggers the upper travel switch 58, the upper travel switch 58 transmits a switch signal to the drive control device 4 through the signal line 40, and the drive control device 4 drives the motor stator 531 through the inverter to generate a reverse rotating magnetic field according to the need, so as to promote the hollow rotor 532 to slow down until stopping, so that an oil extraction process can be completed;
(2) In the return (i.e. downstroke) section, when the hollow rotor 532 stops moving, the lifting screw 541 also stops lifting the sucker rod 522 and the plunger 5232, but then 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 moment, the hollow motor 53 is driven by a load to rotate, so that the hollow motor 53 can become a generator to generate electricity to the drive control device 4, specifically, because the inverter 41 is built in the drive control device 4, the alternating current generated by the hollow motor 53 can be converted into direct current through the inverter 41, and the direct current is transmitted to other surrounding oil recovery devices 10 connected in parallel with the oil recovery device 10 through the bus assembly 3, so as to complete power generation and reutilization, and realize power balance;
When the lifting rod 541 triggers the down-travel switch 59, the down-travel switch 59 transmits a switching signal to the drive control device 4 through the signal line 40, and the drive control device 4 drives the motor stator 531 through the inverter as required to generate a counter-rotating magnetic field so as to cause the hollow rotor 532 to slow down until stopping, so that a power generation process can be completed, and each part of the oil extraction equipment 10 returns to an initial state to prepare for entering the oil extraction process of the next cycle;
Thus, the oil extraction can be realized by sequentially executing the up-stroke and the down-stroke and cyclically executing the steps of up-stroke and down-stroke.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (5)
1. Oil extraction equipment (10), characterized in that the oil extraction equipment (10) comprises a voltage transformation device (1), a rectifying device (2) and a bus assembly (3), wherein the rectifying device (2) is electrically connected with the voltage transformation device (1) and is connected with the bus assembly (3) connected with an external electric device, and the bus assembly (3) is used for transmitting electric 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 drive control device (4) and a single-well drive device (5), and an inverter device (41) is arranged in each drive control device (4); the inversion device (41) is electrically connected to the bus assembly (3) in parallel, and the single-well driving device (5) is driven by the inversion device (41) to recover oil and can generate electricity to supply power to the external electric device through the bus assembly (3);
the single-well driving device (5) comprises a wellhead installation device (51) and a downhole oil pumping device (52), the wellhead installation device (51) is installed at a corresponding wellhead position, and the downhole oil pumping device (52) is located underground and arranged on the wellhead installation device (51); the single-well driving device (5) further comprises a hollow motor (53) and a linear lifting device (54), and the linear lifting device (54) is arranged on the top end of the hollow motor (53); the hollow motor (53) is of a hollow structure, is vertically arranged on the top end of the wellhead installation device (51) and is electrically connected with 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 lift the underground oil pumping device (52) under the driving of the hollow motor (53) so as to realize oil extraction, and can drive the hollow motor (53) to generate electricity in the return stroke;
The hollow motor (53) comprises a motor stator (531), a hollow rotor (532) and a wiring device (533), wherein the motor stator (531) is vertically arranged on the wellhead installation device (51), the hollow rotor (532) is rotationally inserted into the motor stator (531), and the wiring device (533) is arranged on the motor stator (531) and is electrically connected with the inversion device (41);
the lifting rod (541) passes through the hollow rotor (532) and can reciprocate along the axial direction of the hollow rotor (532);
The linear lifting device (54) further comprises a lifting nut (542) and a roller (543) which can synchronously rotate along with the hollow rotor (532), the lifting nut (542) is vertically arranged at the top end of the hollow rotor (532), the roller (543) is arranged in the lifting nut (542), the lifting rod (541) is a lifting screw rod, and the roller (543) is in threaded connection with the peripheral wall of the lifting screw rod so as to enable the lifting screw rod to do linear motion;
The underground oil pumping device (52) comprises an oil pipe (521), an oil pumping rod (522) and a pumping device (523), wherein the top end of the oil pipe (521) is arranged on the wellhead installation device (51), and the bottom end of the oil pipe extends to an oil layer (30) along the corresponding wellhead; the sucker rod (522) is vertically inserted into the wellhead installation device (51) and the oil pipe (521) in sequence, 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 is connected with the bottom end of the sucker rod (522) for pumping oil of the oil layer (30);
The pumping device (523) comprises a working cylinder (5231) and a plunger (5232), the working cylinder (5231) is arranged at the bottom end of the oil pipe (521), and the plunger (5232) is positioned in the working cylinder (5231) and is arranged at the bottom end of the sucker rod (522);
The single-well driving device (5) further comprises an outer shell (55) and a guide device (56) which moves linearly, the outer shell (55) is vertically arranged at the top end of the motor stator (531), a vertical guide groove is formed in the inner wall of the outer shell (55), and the guide device (56) is arranged on the lifting rod (541) so as to prevent the lifting rod (541) from rotating and vertically sliding along the guide groove.
2. The oil extraction apparatus (10) according to claim 1, wherein the centre line of the lifting screw is co-linear with the centre line of the hollow rotor (532).
3. The oil recovery apparatus (10) according to claim 1, wherein a wellhead sealing device (511) is provided in the wellhead mounting device (51), and a top end of the sucker rod (522) is connected to a bottom end of the lifting rod (541) through the wellhead sealing device (511).
4. The oil recovery apparatus (10) according to claim 1, wherein the single well drive device (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 device (51); the bottom end of the lifting rod (541) is connected to the top end of the sucker rod (522) in the supporting cylinder (57) through a connector (544).
5. The oil recovery apparatus (10) of claim 4, wherein the single well drive device (5) further comprises an upper travel switch (58) and a lower travel switch (59) electrically connected to the drive control device (4), the upper travel switch (58) being disposed on the outer housing (55) for limiting a return position of the lifting rod (541), the lower travel switch (59) being disposed on the support cylinder (57) for limiting a return position of the lifting rod (541).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911214650.5A CN110863804B (en) | 2019-12-02 | 2019-12-02 | Oil extraction equipment |
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| CN201911214650.5A CN110863804B (en) | 2019-12-02 | 2019-12-02 | Oil extraction equipment |
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| CN110863804B true CN110863804B (en) | 2024-05-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111395998A (en) * | 2020-03-18 | 2020-07-10 | 安徽物迅科技有限公司 | Energy complementary balanced type simple oil extraction device |
| CN111411921A (en) * | 2020-03-30 | 2020-07-14 | 安徽物迅科技有限公司 | Energy storage type screw lifting linear oil production mechanism |
| CN112211810B (en) * | 2020-09-17 | 2022-04-26 | 中国石油天然气股份有限公司 | Direct drive device of motor without reduction box and operation control method |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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