Lifting system for inclined shaft pumping unit

Abstract

The invention relates to the technical field of oil field oil production engineering, in particular to a lifting system for an inclined shaft pumping unit. The system comprises an oil pumping unit, the oil pumping unit is connected with a polish rod, the polish rod is connected with an upper sucker rod, the tail end of the upper sucker rod is connected with a flexible steel wire rope, the other end of the flexible steel wire rope is connected with a lower sucker rod, and the tail end of the lower sucker rod is connected with an oil well pump plunger. The oil well pump plunger is movably installed in the oil well pump cylinder, the oil pumping unit plunger can be independently replaced, the oil pumping unit is controlled to operate through a control system, and when the oil pumping unit operates, a polish rod, an upper oil pumping rod, a flexible steel wire rope, a lower oil pumping rod and the oil well pump plunger can be driven to operate synchronously. According to the lifting system provided by the invention, the oil well pump can be operated without moving a tubular column by adopting inclined shaft lifting, the plunger can be independently replaced when the plunger goes wrong, the operation cost is reduced, and the operation time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production engineering in oil fields, and particularly relates to a lifting system for a pumping unit in an inclined well. Background Art

[0002] At present, with the continuous development of oil fields, the construction of large platforms with intensive production has become a trend, and the number of inclined wells has increased year by year. Generally speaking, the lifting of inclined wells mainly uses beam pumping units. Near the kick-off point, the conventional sucker rod centralizer and coupling form point-to-plane contact with the tubing, but this method will exacerbate the eccentric wear between the rod and the tubing and shorten the pump inspection period; at the same time, due to the influence of well deviation, the coaxiality between the plunger and the pump barrel becomes poor, which is prone to eccentric wear, thereby shortening the service life of the sucker rod pump. As a result, in order to extend the pump inspection period in the field, the pump inspection rate is reduced, and the setting depth of the sucker rod pump is relatively shallow, unable to get closer to the pay zone, affecting the production capacity. Therefore, in view of the above deficiencies, a lifting system for a pumping unit in an inclined well is proposed. Summary of the Invention

[0003] (I) Technical Problems to be Solved The present invention provides a lifting system for a pumping unit in an inclined well to overcome the defects of large eccentric wear between the sucker rod and the tubing, short pump inspection period, and short service life of the sucker rod pump in the prior art.

[0004] (II) Technical Solutions To solve the above problems, the present invention provides a lifting system for a pumping unit in an inclined well, including: A pumping unit, the pumping unit is connected to a polished rod, the polished rod is connected to an upper sucker rod, the tail end of the upper sucker rod is connected to a flexible steel wire rope, the other end of the flexible steel wire rope is connected to a lower sucker rod, the tail end of the lower sucker rod is connected to a sucker rod pump plunger, the sucker rod pump plunger is movably installed inside a sucker rod pump barrel, the pumping unit plunger can be replaced separately, the pumping unit is controlled to operate by a control system, and when the pumping unit operates, it can drive the polished rod, the upper sucker rod, the flexible steel wire rope, the lower sucker rod, and the sucker rod pump plunger to operate synchronously.

[0005] Preferably, the pumping unit includes a walking beam, the walking beam is connected to the polished rod, and when the walking beam moves upward, it can drive the polished rod, the upper sucker rod, the flexible steel wire rope, the lower sucker rod, and the sucker rod pump plunger to move upward synchronously to achieve liquid lifting.

[0006] Preferably, the upper sucker rod, the flexible steel wire rope, the lower sucker rod, the sucker rod pump plunger, and the sucker rod pump barrel are all installed inside the tubing.

[0007] Preferably, the tubing is connected to a wellhead located on the ground, and the wellhead is sealed by a stuffing box.

[0008] Preferably, an elastic seal is adopted between the pump barrel of the sucker rod pump and the plunger of the sucker rod pump.

[0009] Preferably, the control system includes an intelligent control module, and the control system adjusts the operating state of the pumping unit through the intelligent control module.

[0010] Preferably, the intelligent control module is provided with an intelligent parameter adjustment control mode. The intelligent parameter adjustment control mode monitors the operating power of the motor in real time, automatically identifies the fullness degree of the downhole sucker rod pump, and synchronously adjusts the operating parameters of the pumping unit through the change of the fullness degree of the sucker rod pump.

[0011] Preferably, the oil pipe is an inclined well oil pipe, and wear-resistant coating is sprayed inside the oil pipe.

[0012] (III) Beneficial effects For the lifting system of the inclined well pumping unit provided by the present invention, a flexible steel wire rope is used to replace the conventional sucker rod, and the centralizer is cancelled. The flexible steel wire rope and the oil pipe are in face-to-face contact. The flexible steel wire rope generates flexible deformation along with the wellbore trajectory in the build-up section, further reducing the eccentric wear degree between the sucker rod and the oil pipe, and prolonging the service life of the rod and pipe. The inclined well lifting can realize the operation of the downhole sucker rod pump without pulling out the tubing string. When the plunger has problems, the plunger can be replaced separately, reducing the operation cost and shortening the operation time. Brief description of the drawings

[0013] Figure 1 It is a schematic structural diagram of the lifting system of the inclined well pumping unit according to the embodiment of the present invention.

[0014] Legend: 1 - pumping unit; 2 - polished rod; 3 - stuffing box; 4 - wellhead; 5 - oil pipe; 6 - upper sucker rod; 7 - flexible steel wire rope; 8 - lower sucker rod; 9 - sucker rod pump plunger; 10 - pump barrel of the sucker rod pump; 11 - control system. Embodiment

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by "upper", "lower", "inner", "outer", "top", "bottom", etc. are all based on the orientation or positional relationship shown in the drawings. The purpose is only to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0017] Figure 1 This is a schematic structural diagram of the lifting system for a beam pumping unit in an inclined well according to an embodiment of the present invention. As Figure 1 shown, the present invention provides a lifting system for a beam pumping unit in an inclined well, specifically including: A beam pumping unit 1, the beam pumping unit 1 is connected to a polished rod 2, the polished rod 2 is connected to an upper sucker rod 6, the tail end of the upper sucker rod 6 is connected to a flexible steel wire rope 7, the other end of the flexible steel wire rope 7 is connected to a lower sucker rod 8, the tail end of the lower sucker rod 8 is connected to a pump plunger 9 of a sucker pump, the pump plunger 9 of the sucker pump is movably installed inside a pump barrel 10 of the sucker pump, the pump plunger 9 of the sucker pump can be replaced separately, the beam pumping unit 1 is controlled to operate through a control system 11, when the beam pumping unit 1 operates, it can drive the polished rod 2, the upper sucker rod 6, the flexible steel wire rope 7, the lower sucker rod 8 and the pump plunger 9 of the sucker pump to operate synchronously.

[0018] In practical applications, the beam pumping unit 1 includes a walking beam, the walking beam is connected to the polished rod 2, when the walking beam runs upward, it can drive the polished rod 2, the upper sucker rod 6, the flexible steel wire rope 7, the lower sucker rod 8 and the pump plunger 9 of the sucker pump to move upward synchronously, realizing liquid lifting.

[0019] In this lifting system, the upper sucker rod 6, the flexible steel wire rope 7, the lower sucker rod 8, the pump plunger 9 of the sucker pump and the pump barrel 10 of the sucker pump are all installed inside a tubing 5, the pump barrel 10 of the sucker pump is connected to the tubing 5, the tubing 5 is connected to a wellhead 4 located on the ground, the wellhead 4 is sealed by a packing 3, and the packing 3 seals the upper sucker rod 6 synchronously.

[0020] In practical applications, a special sucker pump is adopted in this lifting system. The sucker pump includes a pump barrel 10 of the sucker pump and a pump plunger 9 of the sucker pump. The inner diameter of the pump barrel 10 of the sucker pump is larger than the inner diameter of the pump plunger 9 of the sucker pump. The pump plunger 9 of the sucker pump is movably installed inside the pump barrel 10 of the sucker pump. The pump barrel 10 of the sucker pump and the pump plunger 9 of the sucker pump adopt elastic sealing. The pump plunger 9 of the sucker pump can be replaced at any time according to the actual production requirements. The pump plunger 9 of the sucker pump can be replaced separately without replacing the pump barrel 10 of the sucker pump together.

[0021] In this lifting system, the control system 11 includes an intelligent control module. The control system 11 adjusts the operating state of the beam pumping unit 1 through the intelligent control module. It should be noted that the intelligent control module is provided with an intelligent parameter adjustment control mode. The intelligent parameter adjustment control mode monitors the operating power of the motor in real time, automatically identifies the filling degree of the downhole sucker pump, and synchronously adjusts the operating parameters of the beam pumping unit 1 through the change of the filling degree of the sucker pump.

[0022] In practical applications, the tubing 5 is an inclined well tubing, and wear-resistant coating is sprayed inside the tubing 5. The tubing 5 extends its service life through the wear-resistant coating.

[0023] In this lifting system, a flexible steel wire rope 7 is used to replace the conventional sucker rod in the deviated section of the inclined well; the pump barrel 10 of the sucker rod pump and the plunger 9 of the sucker rod pump adopt elastic sealing. When there is a problem with the plunger, the plunger can be replaced separately, realizing the operation of not moving the tubing string; the control system 11 adopts an intelligent parameter adjustment control mode through an intelligent control module to adjust the working parameters of the pumping unit 1 in real time, reducing the gas influence caused by insufficient liquid supply of the sucker rod pump; the tubing 5 is an internally sprayed wear-resistant tubing, extending the service life of the inclined well tubing.

[0024] The present invention provides a lifting system for a pumping unit in an inclined well, reducing the degree of eccentric wear between the sucker rod and the tubing, and between the plunger and the pump barrel in the inclined well, realizing tubing string-free pump inspection, and extending the pump inspection period.

[0025] The working principle of this lifting system for a pumping unit in an inclined well will be specifically described below: In this embodiment, the lifting system includes a pumping unit 1, a polished rod 2, a stuffing box 3, a wellhead 4, a tubing 5, an upper sucker rod 6, a flexible steel wire rope 7, a lower sucker rod 8, a plunger 9 of the sucker rod pump, a pump barrel 10 of the sucker rod pump, and a control system 11.

[0026] In practical applications, the pumping unit 1 is connected to the polished rod 2, the polished rod 2 is connected to the upper sucker rod 6, and the upper sucker rod 6 is sealed at the wellhead 4 through the stuffing box 3. The wellhead 4 is located on the ground and is connected to the tubing 5. Among them, the upper sucker rod 6, the flexible steel wire rope 7, the lower sucker rod 8, the plunger 9 of the sucker rod pump, and the pump barrel 10 of the sucker rod pump are all installed inside the tubing 5. One end of the upper sucker rod 6 is connected to the flexible steel wire rope 7, the other end of the flexible steel wire rope 7 is connected to the lower sucker rod 8, the lower sucker rod 8 is connected to the plunger 9 of the sucker rod pump, the plunger 9 of the sucker rod pump is movably installed inside the pump barrel 10 of the sucker rod pump, the pump barrel 10 of the sucker rod pump is connected to the tubing 5, and the control system 11 controls the operation of the pumping unit 1.

[0027] In this embodiment, a flexible steel wire rope 7 is used to replace the conventional sucker rod in the deviated section of the inclined well; the pump barrel 10 of the sucker rod pump and the plunger 9 of the sucker rod pump adopt elastic sealing. When there is a problem with the plunger, the plunger can be replaced separately, realizing the operation of not moving the tubing string; the control system 11 adopts an intelligent parameter adjustment control mode through an intelligent control module to adjust the working parameters of the pumping unit 1 in real time, reducing the gas influence caused by insufficient liquid supply of the sucker rod pump; the tubing 5 is an internally sprayed wear-resistant tubing, extending the service life of the inclined well tubing.

[0028] In practical applications, in the easily eccentric wear positions such as the deviated section and the build-up section, the flexible steel wire rope 7 is used to replace the conventional steel sucker rod. The upper and lower parts of the flexible steel wire rope 7 are respectively connected to the conventional sucker rods. That is to say, one end of the flexible steel wire rope 7 is connected to the upper sucker rod 6, and the other end of the flexible steel wire rope 7 is connected to the lower sucker rod 8. In fact, both the upper sucker rod 6 and the lower sucker rod 8 are conventional sucker rods.

[0029] In this embodiment, the lower sucker rod 8 is connected to the sucker rod pump plunger 9. When the walking beam of the pumping unit 1 moves upward, it can synchronously drive the polished rod 2, the upper sucker rod 6, the flexible wire rope 7, the lower sucker rod 8 and the sucker rod pump plunger 9 to move upward, and realize liquid lifting by driving the polished rod 2, the upper sucker rod 6, the flexible wire rope 7, the lower sucker rod 8 and the sucker rod pump plunger 9.

[0030] It should be noted that the flexible wire rope 7 is a continuous structure and no centralizer is used. The flexible wire rope 7 can achieve flexible deformation, and the flexible wire rope 7 reduces the wear degree between the sucker rod and the tubing 5, and further extends the service life of the tubing 5.

[0031] In practical applications, this lifting system uses a special sucker rod pump that can realize the operation of checking the pump without moving the tubing string. The sucker rod pump includes a sucker rod pump plunger 9 and a sucker rod pump barrel 10. The sucker rod pump plunger 9 is movably installed inside the sucker rod pump barrel 10, and the sucker rod pump plunger 9 is elastically sealed with the sucker rod pump barrel 10. It should be noted that once the sucker rod pump plunger 9 has problems, the sucker rod pump plunger 9 is lifted out of the ground, and after replacing the sucker rod pump plunger 9, it can be lowered into the well again without replacing the sucker rod pump barrel 10, realizing the operation of checking the pump without moving the tubing string, reducing the operation cost and shortening the operation time.

[0032] In this lifting system, the tubing 5 is not only an inclined well tubing, but also an internally sprayed wear-resistant tubing. Wear-resistant coating is sprayed inside the tubing 5. The tubing 5 improves the wear-resistant strength through the wear-resistant coating, extends the service life of the tubing 5, and further extends the pump checking period.

[0033] In practical applications, the pumping unit 1 controls its operating state through the control system 11. The control system 11 includes an intelligent control module, and the intelligent control module is provided with an intelligent parameter adjustment control mode. In this lifting system, the control system 11 adopts the intelligent parameter adjustment control mode to adjust the working parameters of the pumping unit 1 in real time.

[0034] It should be noted that in this lifting system, the control system 11 can not only monitor the real-time running power of the motor, but also automatically identify the change of the fullness of the sucker rod pump underground. In practical applications, when the fullness of the sucker rod pump decreases and gas influence occurs, the control system 11 automatically reduces the operating parameters of the pumping unit 1 through the intelligent parameter adjustment control mode of the intelligent control module to improve the fullness of the sucker rod pump, and then reduces the upward force generated by the downward impact of the sucker rod pump plunger 9 on the liquid surface, slowing down the vibration of the rod string; when the submergence of the sucker rod pump gradually increases, the control system 11 automatically increases the operating parameters of the pumping unit 1 through the intelligent parameter adjustment control mode of the intelligent control module, so that the lifting system operates under a reasonable flowing pressure.

[0035] In addition, in practical applications, the coaxiality between the plunger and the barrel of the conventional sucker rod pump deteriorates due to the influence of the well deviation angle at the placement position. The problems of eccentric wear and leakage of the plunger of the sucker rod pump are prominent. Generally speaking, during the pump inspection operation, the barrel of the sucker rod pump needs to be lifted out of the ground, and the whole set of the sucker rod pump needs to be replaced before it can be lowered into the well. By applying the exclusive special sucker rod pump, once the plunger 9 of the sucker rod pump has problems, the plunger 9 of the sucker rod pump can be lifted out of the ground alone, and after replacing the plunger 9 of the sucker rod pump, it can be directly lowered into the well without lifting the original well string, reducing the operation cost and operation time.

[0036] The lifting system for the inclined well pumping unit provided by the present invention replaces the conventional sucker rod with a flexible steel wire rope 7, cancels the centralizer, and changes to face-to-face contact with the tubing 5. At the same time, since the flexible steel wire rope 7 generates flexible deformation along with the wellbore trajectory in the build-up section, the eccentric wear degree between the sucker rod and the tubing 5 is further reduced, and the service life of the tubing 5 is prolonged. At the same time, the inclined well lifting can realize the operation of the sucker rod pump without moving the pipe string. If the plunger has problems, the plunger can be replaced separately without lifting the original well string, reducing the operation cost and shortening the operation time.

[0037] The above embodiments are only used to illustrate the present invention, rather than limiting the present invention. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention shall be defined by the claims.

Claims

1. A lifting system for a beam pumping unit in an inclined well, characterized in that, it includes: A beam pumping unit (1), the beam pumping unit (1) is connected to a polished rod (2), the polished rod (2) is connected to an upper sucker rod (6), the tail end of the upper sucker rod (6) is connected to a flexible steel wire rope (7), the other end of the flexible steel wire rope (7) is connected to a lower sucker rod (8), the tail end of the lower sucker rod (8) is connected to a pump plunger (9) of a sucker rod pump, the pump plunger (9) of the sucker rod pump is movably installed inside a pump barrel (10) of the sucker rod pump, the pump plunger (9) of the beam pumping unit can be replaced separately, the beam pumping unit (1) is controlled to operate by a control system (11), when the beam pumping unit (1) operates, it can drive the polished rod (2), the upper sucker rod (6), the flexible steel wire rope (7), the lower sucker rod (8) and the pump plunger (9) of the sucker rod pump to operate synchronously.

2. The lifting system for a beam pumping unit in an inclined well according to claim 1, characterized in that, The beam pumping unit (1) includes a walking beam, the walking beam is connected to the polished rod (2), when the walking beam runs upward, it can drive the polished rod (2), the upper sucker rod (6), the flexible steel wire rope (7), the lower sucker rod (8) and the pump plunger (9) of the sucker rod pump to move upward synchronously to achieve liquid lifting.

3. The lifting system for a beam pumping unit in an inclined well according to claim 1, characterized in that, The upper sucker rod (6), the flexible steel wire rope (7), the lower sucker rod (8), the pump plunger (9) of the sucker rod pump and the pump barrel (10) of the sucker rod pump are all installed inside a tubing string (5).

4. The lifting system for a beam pumping unit in an inclined well according to claim 3, characterized in that, The tubing string (5) is connected to a wellhead (4) located on the ground, and the wellhead (4) is sealed by a stuffing box (3).

5. The lifting system for a beam pumping unit in an inclined well according to claim 1, characterized in that, An elastic seal is adopted between the pump barrel (10) of the sucker rod pump and the pump plunger (9) of the sucker rod pump.

6. The lifting system for a beam pumping unit in an inclined well according to claim 1, characterized in that, The control system (11) includes an intelligent control module, and the control system (11) adjusts the operating state of the beam pumping unit (1) through the intelligent control module.

7. The lifting system for a beam pumping unit in an inclined well according to claim 6, characterized in that, The intelligent control module is provided with an intelligent parameter adjustment control mode, the intelligent parameter adjustment control mode monitors the operating power of the motor in real time, automatically identifies the fullness degree of the downhole sucker rod pump, and synchronously adjusts the operating parameters of the beam pumping unit (1) through the change of the fullness degree of the sucker rod pump.

8. The lifting system for a beam pumping unit in an inclined well according to claim 3, characterized in that, The tubing string (5) is an inclined well tubing string, and wear-resistant coating is sprayed inside the tubing string (5).

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