Multifunctional screw pump lifting tubular column

Abstract

The utility model discloses a multifunctional screw pump lifting tubular column which comprises a hollow sucker rod, a screw is arranged at the lower end of the hollow sucker rod, an electric heating mechanism is arranged in the hollow sucker rod, the upper end of the hollow sucker rod is connected with a dosing pipeline, and a liquid medicine outlet is formed in the lower end of the hollow sucker rod. The screw pump mechanism, the underground electric heating mechanism and the underground chemical injection mechanism are integrated on the hollow oil pumping pipe, so that multiple functions are realized; and chemicals can be added into the hollow pipe while underground electric heating is carried out, so that the service life of the pipe column is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a multifunctional screw pump lifting pipe column. Background Art

[0002] Progressive cavity pump lifting technology, characterized by low drive power and energy efficiency, is widely used in heavy oil wells. However, when crude oil viscosity is high, it can easily cause pump blockage, impacting normal production. To address this, various screw pump systems with heating functions have been developed. However, high temperatures can accelerate corrosion of downhole tools.

[0003] Publication number: CN118309394A, discloses a lifting string for oil extraction, including a downhole twin-screw rotor pump, the liquid outlet at the upper end of the downhole twin-screw rotor pump is connected to a first oil pipe, the downhole twin-screw rotor pump is used to pump well fluid into the first oil pipe, the downhole twin-screw rotor pump is connected to a submersible motor, and the submersible motor is connected to a wellhead power supply; it also includes a motor protector, the upper end of the motor protector is connected to the liquid inlet of the downhole twin-screw rotor pump, the lower end of the motor protector is connected to the submersible motor, the motor protector is used to supply motor oil to the submersible motor, and to balance the pressure difference between the motor oil and the well fluid; the upper end of the first oil pipe is connected to a safety valve, the upper end of the safety valve is connected to a second oil pipe, the second oil pipe is connected to the wellhead oil tree, and the safety valve is connected to a hydraulic control pipeline.

[0004] Publication No. CN118242044A, a heavy oil injection and production device with a metal stator screw pump and a method for using the same, comprising an uphole portion and a downhole portion; the uphole portion includes a wellhead assembly, and the downhole portion includes an oil pipe; a hollow rod string is provided within the oil pipe, and a fluid channel is provided within the hollow rod string, the fluid channel being used to inject steam to heat the heavy oil layer at the bottom of the oil pipe; a first channel and a second channel are provided on the wellhead assembly, the first channel communicating with the fluid channel of the hollow rod string and being used to inject superheated steam; the second channel is used to inject insulating gas and is connected to the cavity between the hollow rod string and the oil pipe.

[0005] The above-mentioned prior art performs heating by steam injection, and can use the gas injection channel to add medicine, but the steam injection operation needs to be stopped when adding medicine, and it is impossible to perform the adding and heating operations at the same time.

[0006] Publication No. CN108952653A discloses a heavy oil recovery method using electrically heated gravity drainage. By running a heating cable through a horizontal production well, the heated fluid medium heats the reservoir. This electrically heated gravity drainage method can form a large, continuous heating chamber within a wide range of the strata within the horizontal section of the horizontal production well. Simultaneously, the high-temperature fluid flows toward the toe of the horizontal production well, resulting in more uniform and extended reservoir utilization, enabling greater recovery of the distal reservoir in the horizontal section of the horizontal production well.

[0007] This existing technology cannot perform chemical addition and anti-corrosion operations, and high temperature will accelerate the corrosion of downhole tools.

[0008] Therefore, a multifunctional screw pump lifting string is needed, which can realize downhole heating lifting and add chemical agents into the well during the heating process to ensure the long-term operation of the screw pump lifting.

[0009] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the present utility model. Regarding the more technical features, technical problems to be solved and the beneficial effects of the present utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a multifunctional screw pump lifting pipe column.

[0011] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0012] A multifunctional screw pump lifting pipe string includes a hollow sucker rod, a screw is provided at the lower end of the hollow sucker rod, and an electric heating mechanism is provided inside the hollow sucker rod; the upper end of the hollow sucker rod is connected to the dosing pipeline, and the lower end of the hollow sucker rod is provided with a liquid medicine outlet.

[0013] Furthermore, the electric heating mechanism includes a heating cable, a conductive sleeve, and a rotating power connection device;

[0014] Specifically, the upper end of the hollow sucker rod is connected to a conductive sleeve through an insulating joint, and a heating cable is fixedly connected to the inside of the conductive sleeve;

[0015] Specifically, the heating cable is fixedly arranged in the hollow sucker rod;

[0016] Specifically, a brush is provided inside the rotating power connection device, and the outer wall of the conductive sleeve is in contact with the brush.

[0017] Furthermore, the lower end of the heating cable is fixed to the inner wall of the oil pipe through an insulating end cap;

[0018] Specifically, at least two cable supports are provided between the heating cable and the oil pipe, and the cable supports are provided with liquid flow channels.

[0019] Furthermore, the insulating joint includes a first flange, a second flange, an insulating gasket, and an insulating sleeve;

[0020] Specifically, a first flange is provided at the upper end of the hollow sucker rod, a second flange is provided at the lower end of the conductive sleeve, an insulating gasket is provided between the first flange and the second flange, and the first flange and the second flange are fastened by bolts and nuts with insulating sleeves and insulating washers.

[0021] Furthermore, the upper end of the hollow sucker rod is connected to the injection pipeline through a rotary joint.

[0022] Furthermore, the inner wall of the upper end of the hollow sucker rod is threadedly connected to the collecting joint;

[0023] Specifically, a through hole is provided at the center of the collecting joint, the upper end of the through hole is threadedly connected to the rotary joint, and the upper end of the rotary joint is threadedly connected to the dosing pipeline;

[0024] Specifically, a cable joint is provided axially through the collecting joint, and the heating cable is led out from the inner wall of the conductive sleeve, passes through the cable joint and enters the hollow sucker rod.

[0025] Furthermore, the rotary joint includes a fixed sleeve and a rotating sleeve;

[0026] Specifically, the fixed sleeve is threadedly connected to the collecting joint, the rotating sleeve is threadedly connected to the dosing pipeline, the rotating sleeve is inserted into the fixed sleeve, and the rotating sleeve is rotatably connected to the fixed sleeve.

[0027] Furthermore, a dosing check valve is provided at the lower end of the hollow sucker rod, and a liquid medicine outlet is provided on the side wall of the hollow sucker rod below the valve ball of the dosing check valve;

[0028] Specifically, driving teeth are provided on the outer wall of the hollow sucker rod.

[0029] Furthermore, it also includes a wellhead, an oil pipe, and a casing, wherein the oil pipe is arranged in the casing, and the upper ends of the oil pipe and the casing are both connected to the wellhead;

[0030] Specifically, the hollow sucker rod passes through the wellhead and enters the oil pipe. The lower end of the hollow sucker rod is connected to the solid sucker rod. The lower end of the solid sucker rod is connected to the screw of the screw pump. The pump body of the screw pump is fixedly connected to the inner wall of the oil pipe.

[0031] Furthermore, a driving tooth is provided on the outer wall of the hollow sucker rod above the wellhead, a screw pump driving device is fixedly provided above the wellhead, the screw pump driving device is connected to the hollow sucker rod through the driving tooth, and the screw pump driving device rotates the hollow sucker rod through the driving tooth;

[0032] Specifically, a rotating power connection device is fixedly arranged above the wellhead, and the rotating power connection device is located above the screw pump driving device.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The utility model integrates a screw pump mechanism, a downhole electric heating mechanism, and a downhole drug injection mechanism on a hollow oil pumping pipe, thereby realizing multi-functions.

[0035] 2. The utility model sets a heating cable in the hollow sucker rod and a drug-adding one-way valve at the lower end, which can realize underground electric heating and at the same time realize drug addition into the hollow pipe.

[0036] 3. The utility model sets a cable bracket in the hollow sucker rod to prevent the cable from being excessively twisted due to the rotation of the sucker rod, thereby improving the reliability of the cable. At the same time, a liquid flow channel is set to ensure the flow of the medicinal liquid in the hollow rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of a multifunctional screw pump lifting pipe column in the utility model;

[0038] Figure 2 It is a structural diagram of the cable bracket in the utility model;

[0039] Figure 3 It is a connection diagram of the heating cable and the dosing pipeline in the utility model.

[0040] In the figure: 1. Screw pump drive equipment; 2. Hollow sucker rod; 3. Rotary power connection equipment; 4. Dosing pipeline; 5. Heating cable; 6. Cable bracket; 6.1. Liquid flow channel; 7. Insulating end cap; 8. Dosing check valve; 9. Conversion joint; 10. Solid sucker rod; 11. Screw pump; 12. Conductive sleeve; 13. Rotary joint; 14. Collection joint; 15. Cable connector. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1:

[0043] See also Figures 1 to 3 The utility model provides a multifunctional screw pump lifting string including a wellhead, an oil pipe and a casing. The oil pipe is arranged in the casing, and the upper ends of the oil pipe and the casing are both connected to the wellhead.

[0044] It also includes a hollow sucker rod 2, which passes through the wellhead and enters the oil pipe. The lower end of the hollow sucker rod 2 is connected to the solid sucker rod 10, and the lower end of the solid sucker rod 10 is connected to the screw of the screw pump 11. The pump body of the screw pump 11 is fixedly connected to the inner wall of the oil pipe; a dosing check valve 8 is provided at the lower end of the hollow sucker rod 2, and a liquid medicine outlet 8.1 is provided on the side wall of the hollow sucker rod 2 below the valve ball of the dosing check valve 8. The dosing check valve 8 prevents the liquid in the oil pipe from entering the hollow sucker rod 2. When adding liquid medicines such as corrosion inhibitors and scale inhibitors, the pressure in the hollow sucker rod 2 increases, the valve ball opens, and the medicine flows out through the liquid medicine outlet 8.1.

[0045] A driving tooth is provided on the outer wall of the hollow sucker rod 2 above the wellhead, and a screw pump driving device 1 is fixedly provided above the wellhead. The screw pump driving device 1 is connected to the hollow sucker rod 2 through the driving tooth. The screw pump driving device 1 rotates the hollow sucker rod 2 through the driving tooth, thereby rotating the screw of the screw pump 11.

[0046] It should be noted that the screw pump driving device 1 itself belongs to the existing technology and can be a motor, hydraulic pump and other equipment. Its output shaft is provided with a driving gear to drive the driving gear to drive the hollow sucker rod 2. This is clear to those skilled in the art.

[0047] The upper end of the hollow sucker rod 2 is connected to the conductive sleeve 12 through an insulating joint. A rotating power connection device 3 is fixedly arranged above the wellhead. The rotating power connection device 3 is located above the screw pump drive device 1. A brush is arranged inside the rotating power connection device 3. The outer wall of the conductive sleeve 12 contacts the brush. A heating cable 5 is fixedly connected to the inside of the conductive sleeve. The heating cable 5 is fixedly arranged in the hollow sucker rod 2.

[0048] The upper end of the hollow sucker rod 2 is connected to the injection pipeline 4 through a rotary joint 13.

[0049] Specifically, the hollow sucker rod 2 is connected to the solid sucker rod 10 via a conversion joint.

[0050] Specifically, the lower end of the heating cable 5 is fixed to the inner wall of the oil pipe through an insulating end cap 7. At least two cable supports 6 are set between the heating cable 5 and the oil pipe to maintain the central position of the heating cable 5 and reduce the torsion effect of the rotation of the sucker rod on the cable. The cable support 6 is provided with a liquid flow channel 6.1 to ensure smooth flow of liquid in the hollow sucker rod 2. Figure 2 As shown, in this embodiment, four axially penetrating arc grooves are provided on the outer wall of the cable support 6 as liquid flow channels 6.1.

[0051] Specifically, the insulating joint includes a first flange, a second flange, an insulating gasket, and an insulating sleeve. The first flange is set at the upper end of the hollow sucker rod 2, and the second flange is set at the lower end of the conductive sleeve 12. An insulating gasket is set between the first flange and the second flange. The first flange and the second flange are fastened by bolts and nuts with insulating sleeves and insulating washers.

[0052] Specifically, if Figure 3 As shown, the inner wall of the upper end of the hollow sucker rod 2 is threadedly connected to the collecting joint 14, a through hole is set in the center of the collecting joint 14, the upper end of the through hole is threadedly connected to the rotary joint 13, the upper end of the rotary joint 13 is threadedly connected to the dosing pipeline 4, and a cable joint 15 is set axially through the collecting joint 14. The heating cable 5 is led out from the inner wall of the conductive sleeve 12 and passes through the cable joint 15 to enter the hollow sucker rod 2.

[0053] It should be noted that the rotary joint 13 comprises a fixed sleeve and a rotating sleeve. The fixed sleeve is threadedly connected to the collecting joint 14, and the rotating sleeve is threadedly connected to the dosing pipeline 4. The rotating sleeve is inserted into the fixed sleeve and rotatably connected to the fixed sleeve. A bearing and a sealing ring are disposed between the rotating sleeve and the fixed sleeve. For example, Publication No. CN220891387U discloses a rotary joint for zinc paste delivery.

[0054] Example 2:

[0055] Based on Example 1, this example provides a method for using a multifunctional screw pump to lift a tubing string:

[0056] During normal lifting, the power supply is started and the heating cable 5 is connected by rotating the power connection device 3. As the cable temperature rises, downhole heating is achieved through the hollow sucker rod 2, thereby reducing the viscosity of the fluid.

[0057] At the same time, the wellhead dosing pump pressurizes and adds medicine, and the medicine enters the hollow sucker rod 2 through the dosing pipeline 4, passes through the liquid flow channel 6.1 of the cable bracket 6, opens the dosing check valve 8, and enters the oil pipe through the medicine outlet 8.1, thereby realizing anti-corrosion or anti-scaling protection in the oil pipe, achieving the purpose of anti-corrosion, viscosity reduction, and stable and long-life production.

[0058] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0059] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0060] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0061] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multifunctional screw pump lifting string, comprising a hollow sucker rod, with a screw provided at the lower end of the hollow sucker rod, characterized in that: An electric heating mechanism is provided in the hollow sucker rod; The upper end of the hollow sucker rod is connected to the medicine adding pipeline, and the lower end of the hollow sucker rod is provided with a medicine liquid outlet.

2. A multifunctional screw pump lifting column according to claim 1, characterized in that: The electric heating mechanism includes a heating cable, a conductive sleeve, and a rotating power connection device; The upper end of the hollow sucker rod is connected to a conductive sleeve through an insulating joint, and a heating cable is fixedly connected inside the conductive sleeve; The heating cable is fixedly arranged in the hollow sucker rod; A brush is arranged inside the rotating power connection device, and the outer wall of the conductive sleeve is in contact with the brush.

3. A multifunctional screw pump lifting column according to claim 2, characterized in that: The lower end of the heating cable is fixed to the inner wall of the oil pipe through an insulating end cap; At least two cable supports are arranged between the heating cable and the oil pipe, and the cable supports are provided with liquid flow channels.

4. A multifunctional screw pump lifting column according to claim 2, characterized in that: The insulating joint includes a first flange, a second flange, an insulating gasket, and an insulating sleeve; A first flange is provided at the upper end of the hollow sucker rod, a second flange is provided at the lower end of the conductive sleeve, an insulating gasket is provided between the first flange and the second flange, and the first flange and the second flange are fastened by bolts and nuts with insulating sleeves and insulating washers.

5. The multifunctional screw pump lifting column according to claim 2, characterized in that: The upper end of the hollow sucker rod is connected to the medicine injection pipeline through a rotary joint.

6. A multifunctional screw pump lifting column according to claim 5, characterized in that: The inner wall of the upper end of the hollow sucker rod is threadedly connected to the collecting joint; A through hole is provided at the center of the collecting joint, the upper end of the through hole is threadedly connected to the rotary joint, and the upper end of the rotary joint is threadedly connected to the dosing pipeline; A cable joint is axially provided through the collecting joint, and the heating cable is led out from the inner wall of the conductive sleeve and passes through the cable joint into the hollow sucker rod.

7. The multifunctional screw pump lifting column according to claim 6, characterized in that: The rotary joint includes a fixed sleeve and a rotating sleeve; The fixed sleeve is threadedly connected to the collecting joint, the rotating sleeve is threadedly connected to the dosing pipeline, the rotating sleeve is inserted into the fixed sleeve, and the rotating sleeve is rotatably connected to the fixed sleeve.

8. A multifunctional screw pump lifting column according to any one of claims 2 to 7, characterized in that: A dosing check valve is provided at the lower end of the hollow sucker rod, and a liquid medicine outlet is provided on the side wall of the hollow sucker rod below the valve ball of the dosing check valve; The outer wall of the hollow sucker rod is provided with driving teeth.

9. The multifunctional screw pump lifting column according to claim 8, characterized in that: It also includes a wellhead, an oil pipe, and a casing, wherein the oil pipe is arranged in the casing, and the upper ends of the oil pipe and the casing are connected to the wellhead; The hollow sucker rod passes through the wellhead and enters the oil pipe. The lower end of the hollow sucker rod is connected to the solid sucker rod. The lower end of the solid sucker rod is connected to the screw of the screw pump. The pump body of the screw pump is fixedly connected to the inner wall of the oil pipe.

10. The multifunctional screw pump lifting column according to claim 9, characterized in that: The outer wall of the hollow sucker rod is provided with a driving tooth above the wellhead, and a screw pump driving device is fixedly provided above the wellhead. The screw pump driving device is connected to the hollow sucker rod through the driving tooth, and the screw pump driving device rotates the hollow sucker rod through the driving tooth; A rotating power connection device is fixedly arranged above the wellhead, and the rotating power connection device is located above the screw pump driving device.

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