Underground lifting energy storage tubular column, underground monitoring system and underground lifting energy storage method

Abstract

The invention provides an underground lifting energy storage tubular column, an underground monitoring system and an underground lifting energy storage method, and belongs to oil field oil extraction. The underground lifting energy storage tubular column comprises a sucker rod, a power generation body and an energy storage body, and the power generation body comprises a rotor assembly and a stator assembly; the rotor assembly is fixedly arranged on the sucker rod in a sleeving mode, the stator assembly is arranged outside the rotor assembly in a sleeving mode, and the length of the rotor assembly is larger than that of the stator assembly; the stator assembly is provided with a stator coil winding; the sucker rod can reciprocate in a tubular column, the rotor assembly generates a radial magnetic field along with the reciprocating motion of the sucker rod, and a stator coil winding of the stator assembly generates induced current under the action of the radial magnetic field; and the energy storage body is connected with the power generation body and is used for receiving the induction current from the power generation body to obtain and store electric energy.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield oil production, and particularly to a downhole lifting energy storage string, a downhole monitoring system, and a downhole lifting energy storage method. Background Art

[0002] During the oil well production process, the lifting method mainly uses pumping units. Pumping unit wells are seriously troubled by wax deposition blocking the oil outlet channel, increasing the wellhead back pressure, reducing the oil well production, and increasing the oil well load, which seriously affects the normal production of oil wells. At present, there are mainly three methods for wax prevention and removal in oil wells: hot washing, chemical addition, and electric tracing heating. However, there are the following problems: First, the average hot washing cycle is short and the cost of single hot washing is high; second, the annual chemical addition volume of a single wax deposition well is large, the cost is high, and it increases the later crude oil dehydration treatment cost; third, the energy consumption of electric tracing heating for wax removal is high and large-scale application cannot be achieved. Summary of the Invention

[0003] To solve the above technical defects, the present invention provides a downhole lifting energy storage string, a downhole monitoring system, and a downhole lifting energy storage method. The downhole lifting energy storage string realizes the conversion of mechanical energy, magnetic energy, and electrical energy under the action of a power generation body by using the idle mechanical energy when the sucker rod descends, and stores the electrical energy in an energy storage body.

[0004] The first aspect of the present invention provides a downhole lifting energy storage string, including: a sucker rod, a power generation body, and an energy storage body. The power generation body includes a rotor assembly and a stator assembly;

[0005] The rotor assembly is fixedly sleeved on the sucker rod, the stator assembly is sleeved outside the rotor assembly, and the length of the rotor assembly is greater than the length of the stator assembly;

[0006] The stator assembly is provided with a stator coil winding;

[0007] The sucker rod can reciprocate in the string, and the rotor assembly generates a radial magnetic field with the reciprocating movement of the sucker rod. The stator coil winding of the stator assembly generates an induced current under the action of the radial magnetic field;

[0008] The energy storage body is connected to the power generation body and is used to receive the induced current from the power generation body to obtain electrical energy and store it.

[0009] In an embodiment of the present invention, the downhole lifting energy storage string further includes: a load mechanism,

[0010] The load mechanism is electrically connected to the energy storage body and is used to utilize the electrical energy of the energy storage body.

[0011] In an embodiment of the present invention, the load mechanism is a heating assembly;

[0012] The heating component is installed at the wax deposition point of the downhole lifting energy storage string for heating to prevent and remove wax.

[0013] In an embodiment of the present invention, the load mechanism is a signal transmitter;

[0014] The signal transmitter is connected to a signal receiver on the wellhead for transmitting downhole test signals.

[0015] In an embodiment of the present invention, the sucker rod includes a first sucker rod and a second sucker rod connected in sequence. The second sucker rod has a hollow oil passage, and the rotor assembly is fixedly sleeved on the second sucker rod.

[0016] In an embodiment of the present invention, the downhole lifting energy storage string further includes an inner ring flow-through support member. The inner ring flow-through support member is fixedly installed on the sucker rod and is also fixedly connected to the rotor assembly.

[0017] In an embodiment of the present invention, the rotor assembly includes: a rotor inner tube, a rotor magnet assembly, a rotor retaining ring, and a magnet spacer ring;

[0018] The rotor inner tube is sleeved on the sucker rod and is fixed to the inner ring flow-through support member;

[0019] The rotor magnet assembly is sleeved on the rotor inner tube;

[0020] The rotor retaining ring is sleeved on the rotor inner tube and is arranged at the end of the rotor inner tube for fixing the rotor magnet assembly;

[0021] The magnet spacer ring is arranged between two adjacent rotor magnet assemblies.

[0022] In an embodiment of the present invention, the rotor magnet assembly includes: the rotor magnet assembly includes: a magnet and a magnet protection ring;

[0023] The magnet is sleeved on the rotor inner tube;

[0024] The magnet protection ring is installed on the side of the magnet away from the rotor inner tube.

[0025] In an embodiment of the present invention, the stator assembly includes a white steel liner, a stator coil winding, and a stator retaining ring;

[0026] The stator coil winding is wound around the white steel liner;

[0027] The stator retaining ring is connected to the white steel liner, and the stator retaining ring is used for fixing the stator coil winding.

[0028] In an embodiment of the present invention, the stator coil winding includes: a coil winding, an insulating sheet, a coil spacer ring, and silicon steel sheets;

[0029] The coil spacer ring is attached to the white steel liner;

[0030] The coil winding is wound around the coil spacer ring;

[0031] The insulating sheets are arranged on both sides of the coil winding;

[0032] A plurality of the silicon steel sheets are overlapped and arranged between the insulating sheets of two adjacent coil windings.

[0033] In an embodiment of the present invention, the power generating body further includes: an upper joint of the power generating body, a lower joint of the power generating body, and a generator energy storage joint;

[0034] The upper joint of the power generating body is sleeved outside the rotor assembly and fixedly connected to the upper end of the stator assembly;

[0035] The lower joint of the power generating body is sleeved outside the rotor assembly and fixedly connected to the lower end of the stator assembly;

[0036] The power generating body energy storage joint is connected to the lower joint of the power generating body.

[0037] In an embodiment of the present invention, the energy storage body includes an energy storage body joint, an inner tube of the energy storage body, an outer tube of the energy storage body, an energy storage assembly of the energy storage body, and an electric control joint of the energy storage body;

[0038] The inner tube of the energy storage body, the outer tube of the energy storage body, the energy storage body joint, and the electric control joint of the energy storage body form an energy storage cavity. The energy storage body joint is installed at the upper end of the energy storage cavity and is respectively connected to the inner tube of the energy storage body and the outer tube of the energy storage body. The electric control joint of the energy storage body is installed at the lower end of the energy storage cavity and is respectively connected to the inner tube of the energy storage body and the outer tube of the energy storage body. The energy storage assembly of the energy storage body is arranged in the energy storage cavity;

[0039] The energy storage body joint is further connected to the power generating body energy storage joint of the power generating body.

[0040] In an embodiment of the present invention, the energy storage body further includes an energy storage body cable joint, and the energy storage body cable joint is installed on the energy storage body joint.

[0041] In an embodiment of the present invention, the downhole lifting energy storage pipe string further includes an electric control body, and the electric control body includes an outer tube of the electric control body, an inner tube of the electric control body, an electric control assembly, and an electric control load joint;

[0042] The electric control joint, electric control outer tube, electric control inner tube and electric control load joint of the energy storage body form an electric control cavity. The electric control joint of the energy storage body is installed at the upper end of the electric control cavity and is respectively connected to the electric control inner tube and the electric control outer tube. The electric control load joint is installed at the lower end of the electric control cavity and is respectively connected to the electric control inner tube and the electric control outer tube. The electric control component is placed in the electric control cavity.

[0043] In an embodiment of the present invention, the load mechanism includes a load component, a load mechanism outer tube, a load mechanism inner tube and a lower joint;

[0044] The electric control load joint, the load mechanism inner tube, the load mechanism outer tube and the lower joint form a load cavity. The electric control load component is installed at the upper end of the load cavity and is respectively connected to the load mechanism inner tube and the load mechanism outer tube. The lower joint is installed at the lower end of the load cavity and is respectively connected to the load mechanism inner tube and the load mechanism outer tube. The load component is placed in the load cavity.

[0045] In an embodiment of the present invention, the downhole lifting energy storage pipe string further includes a tubing collar, and the lower end of the tubing collar is connected to the upper joint of the power generation body.

[0046] The second aspect of the present invention provides a downhole monitoring system, including a signal receiver, a monitoring sensor and the downhole lifting energy storage pipe string as described above;

[0047] The signal receiver is communicatively connected to the signal transmitter in the downhole lifting energy storage pipe string;

[0048] The monitoring sensor is connected to the signal transmitter and is used to provide a monitoring signal for the signal transmitter.

[0049] In an embodiment of the present invention, the monitoring sensor includes a temperature sensor and a pressure sensor.

[0050] In an embodiment of the present invention, the monitoring sensor is connected to the energy storage body of the downhole lifting energy storage pipe string, and the energy storage body provides electric energy for the monitoring sensor.

[0051] The third aspect of the present invention provides a downhole lifting energy storage method, which is implemented by using the downhole lifting energy storage pipe string as described above. The method includes:

[0052] Driving the mover assembly of the power generation body to reciprocate through a sucker rod to generate electric energy;

[0053] Storing the generated electric energy through the energy storage body.

[0054] The downhole lifting energy storage pipe string provided by the present invention can utilize the idle mechanical energy when the sucker rod descends, and under the action of the power generation body, realize the conversion of mechanical energy, magnetic energy and electrical energy, and store the electrical energy in the energy storage body.

[0055] Other features and advantages of the technical solution of the present invention will be described in detail in the following specific implementation section. Brief Description of the Drawings

[0056] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the drawings:

[0057] Figure 1 is a schematic structural diagram of the downhole lifting energy storage pipe string provided by the embodiment of the present invention;

[0058] Figure 2 is a schematic structural diagram of the inner pipe string of the downhole lifting energy storage pipe string provided by the embodiment of the present invention;

[0059] Figure 3 is a schematic structural diagram of the outer pipe string of the downhole lifting energy storage pipe string provided by the embodiment of the present invention;

[0060] Figure 4 is a schematic structural diagram of the mover magnet assembly provided by the embodiment of the present invention;

[0061] Figure 5 is a schematic structural diagram of the magnet provided by the embodiment of the present invention;

[0062] Figure 6 is a schematic structural diagram of the stator assembly provided by the embodiment of the present invention;

[0063] Figure 7 is a schematic structural diagram of the stator coil winding provided by the embodiment of the present invention;

[0064] Figure 8 is a simplified structural diagram of the downhole lifting energy storage pipe string provided by the embodiment of the present invention.

[0065] Description of the Reference Numerals

[0066] 1 - Sucker rod, 11 - First sucker rod, 12 - Second sucker rod, 2 - Tubing coupling, 3 - Power generation body, 31 - Rotor assembly, 311 - Rotor retaining ring, 312 - Rotor magnet assembly, 313 - Magnet spacer ring, 3131 - Magnet, 3132 - Magnet protection ring, 314 - Rotor inner tube, 32 - Stator assembly, 321 - Stainless steel lining tube, 322 - Stator coil winding, 3221 - Coil winding, 3222 - Insulating sheet, 3223 - Coil spacer ring, 3224 - Silicon steel sheet, 323 - Stator retaining ring, 33 - Upper joint of power generation body, 34 - Lower joint of power generation body, 35 - Energy storage joint of power generation body, 36 - Outer tube of power generation body, 4 - Inner ring overcurrent support, 5 - Load mechanism, 51 - Heating assembly, 52 - Signal transmitter, 53 - Load assembly, 54 - Outer tube of load mechanism, 55 - Inner tube of load mechanism, 56 - Lower joint, 6 - Energy storage body, 61 - Energy storage joint of energy storage body, 62 - Inner tube of energy storage body, 63 - Outer tube of energy storage body, 64 - Energy storage assembly of energy storage body, 65 - Electric control joint of energy storage body, 66 - Cable joint of energy storage body, 7 - Electric control body, 71 - Outer tube of electric control, 72 - Inner tube of electric control, 73 - Electric control assembly, 74 - Electric control load joint, 8 - Upper sealing ring, 9 - Lower sealing ring, 10 - Tubing. Detailed implementation manners

[0067] In order to make the technical solutions and advantages in the embodiments of the present invention clearer and more understandable, the following further elaborates on the exemplary embodiments of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0068] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0070] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or a connection allowing mutual communication; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the process of implementing the present invention, the inventors found that during the oil well exploitation process, the lifting method mainly relies on pumping units. For pumping unit wells, wax deposition blocks the oil outlet channel, increases the wellhead back pressure, reduces the oil well output, and increases the oil well load, seriously disturbing the normal production of oil wells. Currently, there are mainly three methods for wax prevention and removal in oil wells: hot washing, chemical injection, and electrical tracing. However, the following problems exist: First, the average hot washing cycle is short, and the cost of each hot washing is high. Due to drainage, the annual production time loss per single well is 10 - 22 days per well operation; second, the annual chemical injection volume per single wax deposition well is large, the cost is high, and it increases the cost of subsequent crude oil dehydration treatment; third, the energy consumption of electrical tracing for wax removal is high, and large-scale application cannot be achieved. In addition, for the measurement of downhole temperature, pressure, and flow rate parameters, currently, power is supplied to downhole sensors and data is collected through cables or optical fibers, which is costly and has high requirements for the design of downhole spatial dimensions; while using pre-buried batteries in downhole sensors for power supply, generally, the battery life is short and it cannot meet the long-term collection of downhole temperature, pressure, and flow rate parameters. Therefore, there is an urgent need for a new process and method that can achieve wax prevention and removal in pumping unit wells and downhole temperature and pressure signal transmission at low cost, reduce operation costs, improve operation efficiency, and at the same time, the accurate acquisition of downhole temperature and pressure signals can be used to adjust parameters such as the stroke and pumping frequency of surface equipment such as pumping units, helping the oilfield production to achieve intelligentization.

[0072] In view of the above problems, in an embodiment of the present invention, a downhole lifting energy storage string is provided, including: a sucker rod, a power generation body, and an energy storage body. The power generation body includes a rotor assembly and a stator assembly; the rotor assembly is fixedly sleeved on the sucker rod, the stator assembly is sleeved outside the rotor assembly, and the length of the rotor assembly is greater than the length of the stator assembly; the stator assembly is provided with a stator coil winding; the sucker rod can reciprocate in the string, the rotor assembly generates a radial magnetic field as the sucker rod reciprocates, and the stator coil winding of the stator assembly generates an induced current under the action of the radial magnetic field; the energy storage body is connected to the power generation body and is used to receive the induced current from the power generation body to obtain electrical energy and store it. The downhole lifting energy storage string provided by the present invention can utilize the idle mechanical energy when the sucker rod descends, and under the action of the power generation body, realize the conversion of mechanical energy, magnetic energy, and electrical energy, and store the electrical energy in the energy storage body.

[0073] Figure 1It is a schematic structural diagram of an underground lifting energy storage pipe string provided by an embodiment of the present invention.

[0074] Figure 2 It is a schematic structural diagram of the inner pipe string of the underground lifting energy storage pipe string provided by an embodiment of the present invention.

[0075] Figure 3 It is a schematic structural diagram of the outer pipe string of the underground lifting energy storage pipe string provided by an embodiment of the present invention.

[0076] As Figures 1-3 shown, an underground lifting energy storage pipe string provided by this embodiment includes: a sucker rod 1, a power generation body 3, and an energy storage body 6. The power generation body 3 includes a rotor assembly 31 and a stator assembly 32;

[0077] The rotor assembly 31 is fixedly sleeved on the sucker rod 1, the stator assembly 32 is sleeved outside the rotor assembly 31, and the length of the rotor assembly 31 is greater than the length of the stator assembly 32;

[0078] The stator assembly 32 includes an induction coil;

[0079] The sucker rod 1 can reciprocate in the pipe string. The rotor assembly 31 generates a radial magnetic field along with the reciprocating movement of the sucker rod 1, and an induced current is generated in the induction coil of the stator assembly 32 under the action of the radial magnetic field;

[0080] The energy storage body 6 is connected to the power generation body 3 and is used to receive the induced current from the power generation body 3 to obtain electric energy and store it.

[0081] A load mechanism 5, electrically connected to the energy storage body 6, is used to utilize the electric energy of the energy storage body 6.

[0082] Furthermore, the load mechanism 5 uses the electric energy of the energy storage body 6 to heat the oil pipe 10 in the pipe string to achieve wax cleaning and prevention of the oil pipe 10. The load mechanism 5 is also used for power supply in downhole testing to realize the transmission of test signals.

[0083] In this embodiment, the load mechanism 5 is a heating component 51. The heating component 51 is installed at the wax deposition point of the oil pipe 10 for heating and wax cleaning and prevention.

[0084] In this embodiment, the load mechanism 5 is a signal transmitter 52. The signal transmitter 52 is connected to a signal receiver on the wellhead and is used to transmit downhole test signals.

[0085] In this embodiment, the sucker rod 1 includes a first sucker rod 11 and a second sucker rod 12 connected in sequence. The first sucker rod 11 is a conventional sucker rod 1, and the second sucker rod 12 has a hollow oil passage.

[0086] The upper and lower ends of the second sucker rod 12 are provided with sucker rod threads. The upper end is connected to the wellhead polished rod after being connected to the multi-stage first sucker rod 11, and the lower end is connected to the plunger of the oil pump after being connected to the multi-stage first sucker rod 11.

[0087] In this embodiment, the downhole lifting energy storage string further includes an inner ring flow-through support member 4. The inner ring flow-through support member 4 is fixedly installed on the sucker rod 1, and the inner ring flow-through support member 4 is also fixedly connected to the mover assembly 31. Specifically, the inner flow-through ring support is fixed to the thin-diameter rod body of the sucker rod 1, and 3-5 are evenly distributed in the circumferential direction and are fixedly welded. A plurality of inner flow-through ring supports are evenly distributed axially on the sucker rod 1, and all are fixedly welded. At the same time, the inner flow-through ring support is fixedly welded to the mover assembly 31. Thus, the downhole oil flow lifting channel is formed by the inner diameter of the sucker rod 1, the inner flow-through ring support, and the mover assembly 31, and this channel meets the lifting requirements of multi-pump type oil pumps.

[0088] In this embodiment, the power generation body 3 further includes: an upper joint 33 of the power generation body, a lower joint 34 of the power generation body, and an energy storage joint 35 of the power generation body;

[0089] The upper joint 33 of the power generation body is sleeved outside the mover assembly 31 and is fixedly connected to the upper end of the stator assembly 32;

[0090] The lower joint 34 of the power generation body is sleeved outside the mover assembly 31 and is fixedly connected to the lower end of the stator assembly 32;

[0091] The energy storage joint 35 of the power generation body is connected to the lower joint 34 of the power generation body.

[0092] Furthermore, the power generation body 3 further includes an outer tube 36 of the power generation body. The outer tube 36 of the power generation body is used to encapsulate the upper joint 33 of the power generation body, the lower joint 34 of the power generation body, the energy storage joint 35 of the power generation body, and the stator assembly 32.

[0093] Figure 4 It is a schematic structural diagram of the mover magnet assembly provided by the embodiment of the present invention.

[0094] Figure 5 It is a schematic structural diagram of the magnet provided by the embodiment of the present invention. As Figures 4-5 shown, in this embodiment, the mover assembly 31 includes a mover inner tube 314, a mover magnet assembly 312, a mover retaining ring 311, and a magnet spacer ring 313;

[0095] The mover inner tube 314 is sleeved on the sucker rod 1 and is fixed to the inner ring flow-through support member 4;

[0096] The mover magnet assembly 312 is sleeved on the mover inner tube 314;

[0097] The mover retaining ring 311 is sleeved on the mover inner tube 314 and arranged at the end of the mover inner tube 314 for fixing the mover magnet assembly 312;

[0098] The magnet spacer ring 313 is arranged between two adjacent mover magnet assemblies 312.

[0099] The magnet spacer ring is made of stainless steel and has a rotary body structure. Since the magnets are in tile shape and the length of a single magnet is limited, a magnet spacer ring needs to be added between every two magnets to play the role of high magnetic permeability and non-magnetic resistance.

[0100] The mover magnet assembly 312 includes: a magnet 3131 and a magnet protection ring 3132;

[0101] The magnet 3131 is sleeved on the mover inner tube 314;

[0102] The magnet protection ring 3132 is installed on the side of the magnet 3131 away from the mover inner tube 314.

[0103] Specifically, the mover retaining ring 311, the mover magnet assembly 312, and the magnet spacer ring 313 are sequentially sleeved onto the lifting mover inner tube 314 and fixed by welding at both ends. The overall lifting mover assembly 31 is composed of multiple groups of mover magnet assemblies 312 and magnet spacer rings 313. The mover magnet assembly 312 mainly includes a magnet 3131 and a magnet protection ring 3132. An even number of magnets 3131 are circumferentially distributed evenly to realize N and S magnetic poles relatively, so as to form a radial magnetic field.

[0104] The mover assembly 31 and the sucker rod 1 are fixed by an inner current-carrying ring support to form an integral body and are lowered into the stator section together with the sucker rod 1. The inner and outer diameters of the upper sealing ring 8 are designed with multiple O-ring grooves to play a sealing role. The upper sealing ring 8 is sleeved onto the generator upper joint 33 and is threadedly connected to the lifting generator outer tube. The upper sealing ring 8 is designed with multiple through holes on the circumference. When the lifting generator is assembled, sealing grease is injected through these holes to realize overall insulation and waterproof treatment.

[0105] Figure 6 It is a schematic structural diagram of the stator assembly provided by an embodiment of the present invention.

[0106] Figure 7 It is a schematic structural diagram of the stator coil winding provided by an embodiment of the present invention. As Figures 6-7 shown, in this embodiment, the stator assembly 32 includes: a white steel liner 321, a stator coil winding 322, and a stator retaining ring 323;

[0107] The stator coil winding 322 is wound around the white steel liner 321;

[0108] The stator retaining ring 323 is connected to the stainless steel liner 321, and the stator retaining ring 323 is used to fix the stator coil winding 322.

[0109] The stator coil winding 322 includes: a coil winding 3221, an insulating sheet 3222, a coil spacer 3223, and silicon steel sheets 3224;

[0110] The coil spacer 3223 is attached to the stainless steel liner 321; the coil spacer serves as an integrated design of a coil winding winding skeleton and a stator coil.

[0111] The coil winding 3221 is wound around the coil spacer 3223,

[0112] The insulating sheet 3222 is disposed on both sides of the coil winding 3221;

[0113] A plurality of the silicon steel sheets 3224 are overlapped and disposed between the insulating sheets 3222 of two adjacent coil windings 3221. The silicon steel sheets are used to enhance the magnetic induction intensity.

[0114] Further, the inner diameter of the stator retaining ring 323 is designed with a thread and is fixedly connected to the stainless steel liner 321 by threading. After sequentially sleeving multiple stator coil windings 322, the end portion is fixed by the stator retaining ring 323.

[0115] The coil winding 3221 mainly includes an insulating sheet 3222, a coil winding 3221, silicon steel sheets 3224, and a coil spacer 3223. The insulating sheet 3222 is on both sides of the coil winding 3221 to play an insulating role. The coil winding 3221 is wound around the coil spacer 3223, and the number of turns of winding is according to the design requirements. The silicon steel sheets 3224 are composed of multiple sub-silicon steel sheets 3224.

[0116] Specifically, the single-stage stator coil winding 322 is designed to be wound with a 0.5 mm wire to form 1280 turns, realizing a single-stage generated voltage of 54 V. By connecting multiple stator coil windings 322 in series, a generated voltage of 540 V or more is achieved, which is used for energy storage of the energy storage component 64 of the energy storage body. At the same time, a group of stator coil windings 322 is led out to generate a 24 V voltage for the control of the electric control body 7.

[0117] The upper joint 33 of the power generation body has the same inner through diameter as the stator assembly 32, and there is a gap of 3 - 5 mm between its outer diameter and the outer diameter of the stator assembly 32. The inner ring overcurrent support 4 is fixed on the thin rod body of the sucker rod 1, with 3 - 5 evenly distributed circumferentially and fixed by welding. The inner overcurrent rings are evenly distributed axially on the sucker rod 1 and are all fixed by welding. At the same time, the inner ring overcurrent support 4 is welded and fixed to the rotor assembly 31. Thus, the sucker rod 1, the inner ring overcurrent support 4 and the inner through diameter of the rotor assembly 31 form an underground oil flow lifting channel. The equivalent aperture of the annulus of this lifting channel is designed to be ≥φ20 mm, so as to meet the lifting of multi - pump type sucker pumps without throttling.

[0118] One end of the lower joint 34 of the power generation body has 10 - thread connections for the oil pipe, which is connected and sealed with the energy storage joint 35 of the power generation body. The outer diameter is designed with multiple O - ring grooves and is sealed with the O - ring of the lower sealing ring 9. The other end is designed with thread connections and is thread - connected and fixed to the stator assembly 32. The outer diameter of the lower sealing ring 9 is designed with multiple O - ring grooves to play a sealing role. It is sleeved onto the lower joint 34 of the power generation body and is thread - connected to the outer pipe 36 of the power generation body. The circumference of the lower sealing ring 9 is designed with multiple through - holes. When the power generation body 3 is assembled, sealing grease is injected through these holes to achieve overall insulation and waterproof treatment. At the same time, the cable is led out from these holes to the energy storage body 6 for charging.

[0119] When designing the outer diameter of the rotor assembly 31, the clearance between its inner diameter and the inner diameter of the stator assembly 32 should be 3 - 5 mm, and it should be as close as possible to the stator assembly 32, so as to make the most of the magnetic field energy, because the magnetic energy of the magnetic field decreases inversely with the increase of the distance. When designing the inner diameter of the stator assembly 32, it is necessary to ensure that it does not throttle the lifting oil flow of the downhole sucker pump. When designing the length of the rotor assembly 31, the self - weight elongation of the overall pipe string needs to be considered. The length of the rotor assembly 31 is longer than that of the stator assembly 32 to achieve continuous power generation of the stator assembly 32 and maximize the utilization of the overall pipe string.

[0120] The downhole lifting energy storage pipe string also includes an upper sealing ring 8. The inner and outer diameters of the upper sealing ring 8 are designed with multiple O - ring grooves to play a sealing role. It is sleeved onto the upper joint 33 of the power generation body and is thread - connected to the outer pipe of the power generation body. The circumference of the upper sealing ring 8 is designed with 4 - 6 through - holes. When the power generation body 3 is assembled, sealing grease is injected through these holes to achieve overall insulation and waterproof treatment.

[0121] Both ends of the energy storage joint 35 of the power generation body are designed with 10 - thread connections for the oil pipe. The upper end is connected and sealed with the 10 - thread connection of the oil pipe of the lower joint 34 of the power generation body, and the lower end is connected and sealed with the 10 - thread connection of the energy storage body joint 61. The energy storage joint 35 of the power generation body is designed with multiple through - holes for the lifting power generation lead - out wire to pass through the wire groove.

[0122] In this embodiment, the energy storage body 6 includes an energy storage body connector 61, an inner energy storage tube 62, an outer energy storage tube 63, an energy storage body energy storage component 64, and an energy storage body electronic control connector 65. The inner energy storage tube 62, the outer energy storage tube 63, the energy storage body connector 61, and the energy storage body electronic control connector 65 form an energy storage cavity. The energy storage body connector 61 is installed at the upper end of the energy storage cavity and is respectively connected to the inner energy storage tube 62 and the outer energy storage tube 63. The energy storage body electronic control connector 65 is installed at the lower end of the energy storage cavity and is respectively connected to the inner energy storage tube 62 and the outer energy storage tube 63. The energy storage body energy storage component 64 is arranged in the energy storage cavity;

[0123] The energy storage body connector 61 is also connected to the energy storage connector 35 of the power generation body 3.

[0124] In this embodiment, the energy storage body 6 further includes an energy storage body cable connector 66, and the energy storage body cable connector 66 is installed on the energy storage body connector 61.

[0125] Specifically, the left and right inner diameters of the energy storage body connector 61 are designed with 10 oil pipe buckles, which are connected and sealed to the energy storage connector 35 of the power generation body at the upper end and to the inner energy storage tube 62 at the lower end. The outer diameter of the right end of the energy storage body connector 61 is designed with multiple O-ring seal grooves. The left end face of the energy storage body connector 61 is designed with a cable connector installation hole, and the energy storage body cable connector 66 is connected and sealed with an O-ring.

[0126] The inner energy storage tube 62 is designed as a common oil pipe 10, with 10 oil pipe buckle threads designed at the upper and lower parts, which are respectively threadedly connected and sealed to the energy storage body connector 61 and the energy storage body electronic control connector 65. The outer energy storage tube 63 is sleeved on the energy storage body connector 61 and sealed with an O-ring. The energy storage body energy storage component 64 is installed in the cavity formed by the energy storage body connector 61, the inner energy storage tube 62, the outer energy storage tube 63, and the energy storage body electronic control connector 65, and is used to store the electric energy of the lifting power generation part.

[0127] The inner diameter of both ends of the energy storage body electronic control connector 65 is designed with 10 oil pipe buckle threads, which are respectively connected and sealed to the inner energy storage tube 62 and the oil pipe 10 buckle of the electronic control inner tube 72. The outer diameter of both ends is designed with multiple O-ring seal grooves, which are respectively O-ring sealed to the outer energy storage tube 63 and the electronic control outer tube 71. The circumferential end face of the energy storage body electronic control connector 65 is designed with multiple holes for the energy storage component cable to pass through, so as to control the electronic control component 73.

[0128] In this embodiment, the downhole lifting energy storage string further includes an electric control body 7, which includes an electric control outer tube 71, an electric control inner tube 72, an electric control component 73, and an electric control load joint 74. The energy storage body electric control joint 65, the electric control outer tube 71, the electric control inner tube 72, and the electric control load joint 74 form an electric control cavity. The energy storage body electric control joint 65 is installed at the upper end of the electric control cavity and is respectively connected to the electric control inner tube 72 and the electric control outer tube 71. The electric control load joint 74 is installed at the lower end of the electric control cavity and is respectively connected to the electric control inner tube 72 and the electric control outer tube 71. The electric control component 73 is placed in the electric control cavity.

[0129] Specifically, the two ends of the electric control inner tube 72 are designed with tubing 10 threads, which are respectively used for the tubing 10 connection and sealing of the energy storage body electric control joint 65 and the electric control load joint 74. The electric control outer tube 71 is sealed with the energy storage body electric control joint 65 and the electric control load joint 74 by O-ring seals. The electric control component 73 is installed in the cavity formed by the electric control inner tube 72, the energy storage body electric control joint 65, the electric control outer tube 71, and the electric control load joint 74.

[0130] The two ends of the inner diameter of the electric control load joint 74 are designed with tubing threads, which are respectively connected and sealed with the tubing 10 of the electric control inner tube 72 and the inner tube 55 of the load mechanism. The two ends of the outer diameter are designed with multiple O-ring grooves, which are respectively O-ring sealed with the electric control outer tube 71 and the outer tube 54 of the load mechanism. Multiple holes are designed on the circumferential end face of the electric control load joint 74 for the cable of the electric control component 73 to pass through, so as to control the load component 53.

[0131] In this embodiment, the load mechanism 5 includes a load component 53, a load mechanism outer tube 54, a load mechanism inner tube 55, and a lower joint 56. The electric control load joint 74, the load mechanism inner tube 55, the load mechanism outer tube 54, and the lower joint 56 form a load cavity. The electric control load component 53 is installed at the upper end of the load cavity and is respectively connected to the load mechanism inner tube and the load mechanism outer tube. The lower joint 56 is installed at the lower end of the load cavity and is respectively connected to the load mechanism inner tube and the load mechanism outer tube. The load component 53 is placed in the load cavity.

[0132] Furthermore, the present invention has multiple load mechanisms 5, corresponding to multiple load cavities obtained. The load component 53 includes a heating component 51 and a signal generator 52, and the heating component 51 and the signal generator 52 are respectively installed in different load cavities.

[0133] The two ends of the inner diameter of the lower joint 56 are designed with tubing 10 threads, the upper end is connected and sealed with the tubing 10 of the load mechanism inner tube 55, the outer diameter is designed with multiple O-ring grooves, and is O-ring sealed with the load mechanism outer tube 54. The lower end of the lower joint 56 is connected and sealed with the tubing 10 of the ordinary tubing 10.

[0134] In this embodiment, the downhole lifting energy storage string further includes a tubing 10 coupling 2, and the lower end of the tubing 10 coupling 2 is connected to the power generation body upper joint 33.

[0135] Figure 8 is a structural schematic diagram of the downhole lifting energy storage string provided by the embodiment of the present invention. As Figure 8 shown, in this embodiment, the downhole lifting energy storage string is divided into an inner string and an outer string. The inner string is composed of a sucker rod 1, an inner ring flow-through support member 4, and a rotor assembly 31; the stator assembly 32, the energy storage body 6, the load mechanism 5, the power generation body upper joint 33, the power generation body lower joint 34, the power generation body energy storage joint 35, and the electronic control body 7 of the downhole lifting energy storage string are the outer string. The outer string is connected to the tubing 10 and lowered into the designated formation. The heating assembly 51 is located at the wax deposition point of the oil well, and the signal receiver body is located below the fluid level. Then, the sucker rod 1 with the rotor assembly 31 is lowered. The rotor assembly 31 is slightly longer than the power generation stator to ensure that the downhole power generation link is always in a working state. As the sucker rod 1 reciprocates up and down, a certain amount of electric power is generated in the downhole lifting power generation part due to the action of magnetic field and mechanical energy. Part of this electric power is used for energy storage by the energy storage component 64 of the energy storage body, and the other part is used for the electronic control of the lifting power generation link. The electric power generated by the lifting power generation is used for two functions. One part is used for high-power heating to heat the oil flow lifted from the inner diameter. The heating temperature is higher than the wax precipitation temperature of the oil, so as to achieve the purpose of wax prevention and removal of the overall string. The other part is used for power supply for transmitting and emitting downhole temperature and pressure signals. By measuring signals such as temperature and pressure below the fluid level, accurate downhole signals can be obtained, so as to adjust parameters such as stroke and stroke frequency, and realize the intelligent construction of the oil production system.

[0136] Further, the pipe string includes two - stage energy storage, one - stage heating induction coil, and two - stage electromagnetic induction coils. A strong magnet (i.e., the mover assembly 31) is attached to the sucker rod 1, and a closed induction coil (i.e., the stator assembly 32) is designed on the tubing 10 section. The reciprocating motion of the sucker rod 1 is used to generate an induced electromotive force to charge the energy storage module, thus meeting two functions: on the one hand, the energy storage discharges to heat the tubing 10 and the oil flow through the tubing 10 at the wax - forming point by the coil, increasing the temperature inside the tubing 10 to achieve the effect of wax removal and prevention; on the other hand, the energy storage discharges to supply power to the downhole temperature - pressure signal generator 52. The sensor emits acoustic signals to the ground receiver, and after encoding, decoding, amplification, etc., the temperature - pressure signals below the fluid level are obtained, so that the stroke and stroke frequency of the pumping unit system can be accurately adjusted, facilitating the intelligent construction of the oilfield production system. The pipe string consists of four parts, namely: inner pipe string: the first sucker rod 11, the second sucker rod 12, the mover assembly 31, the first sucker rod 11, the second sucker rod 12, the mover assembly 31; outer pipe string: insulated tubing, ordinary tubing, non - metallic tubing, ordinary tubing, non - metallic tubing, ordinary tubing; between the tubing and the casing: the stator assembly 32, the energy storage body 6, the signal generator 52; on the ground: the signal receiver.

[0137] In the second aspect of this embodiment, a downhole monitoring system is provided, including a signal receiver, a monitoring sensor, and the downhole lifting energy - storage pipe string as described above;

[0138] The signal receiver is communicatively connected to the signal transmitter 52 in the downhole lifting energy - storage pipe string;

[0139] The monitoring sensor is connected to the signal transmitter 52 and is used to provide monitoring signals for the signal transmitter 52.

[0140] In this embodiment, the monitoring sensor includes a temperature sensor and a pressure sensor.

[0141] In this embodiment, the monitoring sensor is connected to the energy storage body 6 of the downhole lifting energy - storage pipe string, and the energy storage body 6 provides electrical energy for the monitoring sensor.

[0142] In the third aspect of this embodiment, a downhole lifting energy - storage method is provided. The method is implemented by using the downhole lifting energy - storage pipe string as described above, and the method includes:

[0143] Driving the mover assembly 31 of the power generation body 3 to reciprocate through the sucker rod 1 to generate electrical energy;

[0144] Storing the generated electrical energy through the energy storage body 6.

[0145] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0146] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

[0147] The optional embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple variations can be made to the technical solutions of the embodiments of the present invention, and these simple variations all fall within the protection scope of the embodiments of the present invention. Additionally, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction, as long as the combination does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. An underground lifting energy storage pipe string, characterized in that, Comprising: A sucker rod, a power generation body, and an energy storage body, wherein the power generation body includes a rotor assembly and a stator assembly; The rotor assembly is fixedly sleeved on the sucker rod, the stator assembly is sleeved outside the rotor assembly, and the length of the rotor assembly is greater than the length of the stator assembly; The stator assembly is provided with a stator coil winding; The sucker rod can reciprocate in the pipe string, and the rotor assembly generates a radial magnetic field with the reciprocating movement of the sucker rod, and the stator coil winding of the stator assembly generates an induced current under the action of the radial magnetic field; The energy storage body is connected to the power generation body and is used to receive the induced current from the power generation body to obtain electric energy and store it.

2. The underground lifting energy storage pipe string according to claim 1, characterized in that, The downhole lifting energy storage pipe string further includes: a load mechanism, The load mechanism is electrically connected to the energy storage body and is used to utilize the electric energy of the energy storage body.

3. The underground lifting energy storage pipe string according to claim 2, characterized in that, The load mechanism is a heating component; The heating component is installed at the wax deposition point of the downhole lifting energy storage pipe string for heating to prevent and remove wax.

4. The underground lifting energy storage pipe string according to claim 2, characterized in that, The load mechanism is a signal transmitter; The signal transmitter is communicatively connected to a signal receiver on the wellhead and is used to transmit downhole test signals.

5. The underground lifting energy storage pipe string according to claim 1, characterized in that, The sucker rod includes a first sucker rod and a second sucker rod connected in sequence, the second sucker rod has a hollow oil passage, and the rotor assembly is fixedly sleeved on the second sucker rod.

6. The underground lifting energy storage pipe string according to claim 1, characterized in that, The downhole lifting energy storage pipe string further includes an inner ring overcurrent support member, the inner ring overcurrent support member is fixedly installed on the sucker rod, and the inner ring overcurrent support member is also fixedly connected to the rotor assembly.

7. The underground lifting energy storage pipe string according to claim 1, characterized in that, The rotor assembly includes: a rotor inner tube, a rotor magnet assembly, a rotor retaining ring, and a magnet spacer ring; The rotor inner tube is sleeved on the sucker rod and is fixed to the inner ring overcurrent support member; The rotor magnet assembly is sleeved on the rotor inner tube; The rotor retaining ring is sleeved on the rotor inner tube and is arranged at the end of the rotor inner tube for fixing the rotor magnet assembly; The magnet spacer ring is arranged between two adjacent rotor magnet assemblies.

8. The underground lifting energy storage pipe string according to claim 7, characterized in that, The rotor magnet assembly includes: a magnet and a magnet protection ring; The magnet is sleeved on the rotor inner tube; The magnet protection ring is installed on the side of the magnet away from the rotor inner tube.

9. The underground lifting energy storage pipe string according to claim 1, characterized in that, The stator assembly includes: a stainless steel liner, a stator coil winding, and a stator retaining ring; The stator coil winding is wound on the stainless steel liner; The stator retaining ring is connected to the stainless steel liner, and the stator retaining ring is used to fix the stator coil winding.

10. The underground lifting energy storage pipe string according to claim 9, characterized in that, The stator coil winding includes: a coil winding, an insulating sheet, a coil spacer ring, and silicon steel sheets; The coil spacer ring is attached to the stainless steel liner; The coil winding is wound on the coil spacer ring; The insulating sheets are arranged on both sides of the coil winding; A plurality of the silicon steel sheets are overlapped between the insulating sheets of two adjacent coil windings.

11. The downhole lifting energy storage string according to claim 2, characterized in that, The power generation body further includes: an upper joint of the power generation body, a lower joint of the power generation body, and a generator energy storage joint; The upper joint of the power generation body is sleeved outside the rotor assembly and is fixedly connected to the upper end of the stator assembly; The lower joint of the power generation body is sleeved outside the rotor assembly and is fixedly connected to the lower end of the stator assembly; The generator energy storage joint is connected to the lower joint of the power generation body.

12. The downhole lifting energy storage string according to claim 11, characterized in that, The energy storage body includes an energy storage body connector, an inner tube of the energy storage body, an outer tube of the energy storage body, an energy storage component of the energy storage body, and an electrical control connector of the energy storage body; The inner tube of the energy storage body, the outer tube of the energy storage body, the energy storage body connector, and the electrical control connector of the energy storage body form an energy storage cavity. The energy storage body connector is installed at the upper end of the energy storage cavity and is respectively connected to the inner tube of the energy storage body and the outer tube of the energy storage body. The electrical control connector of the energy storage body is installed at the lower end of the energy storage cavity and is respectively connected to the inner tube of the energy storage body and the outer tube of the energy storage body. The energy storage component of the energy storage body is arranged in the energy storage cavity; The energy storage body connector is connected to the energy storage connector of the power generation body of the power generation body.

13. The downhole lifting energy storage string according to claim 12, characterized in that, The energy storage body further includes an energy storage body cable connector, and the energy storage body cable connector is installed on the energy storage body connector.

14. The downhole lifting energy storage string according to claim 12, characterized in that, The downhole lifting energy storage pipe string further includes an electrical control body, and the electrical control body includes an outer electrical control tube, an inner electrical control tube, an electrical control component, and an electrical control load connector; The electrical control connector of the energy storage body, the outer electrical control tube, the inner electrical control tube, and the electrical control load connector form an electrical control cavity. The electrical control connector of the energy storage body is installed at the upper end of the electrical control cavity and is respectively connected to the inner electrical control tube and the outer electrical control tube. The electrical control load connector is installed at the lower end of the electrical control cavity and is respectively connected to the inner electrical control tube and the outer electrical control tube. The electrical control component is placed in the electrical control cavity.

15. The downhole lifting energy storage string according to claim 14, characterized in that, The load mechanism includes a load component, an outer tube of the load mechanism, an inner tube of the load mechanism, and a lower joint; The electrical control load connector, the inner tube of the load mechanism, the outer tube of the load mechanism, and the lower joint form a load cavity. The electrical control load component is installed at the upper end of the load cavity and is respectively connected to the inner tube of the load mechanism and the outer tube of the load mechanism. The lower joint is installed at the lower end of the load cavity and is respectively connected to the inner tube of the load mechanism and the outer tube of the load mechanism. The load component is placed in the load cavity.

16. The downhole lifting energy storage string according to claim 11, characterized in that, The downhole lifting energy storage pipe string further includes a tubing coupling, and the lower end of the tubing coupling is connected to the upper joint of the power generation body.

17. A downhole monitoring system, characterized in that, It includes a signal receiver, a monitoring sensor, and a downhole lifting energy storage pipe string according to any one of claims 1-16; The signal receiver is communicatively connected to a signal transmitter in the downhole lifting energy storage pipe string; The monitoring sensor is connected to the signal transmitter and is used to provide a monitoring signal for the signal transmitter.

18. The downhole monitoring system according to claim 17, characterized in that, The monitoring sensor includes a temperature sensor and a pressure sensor.

19. The downhole monitoring system according to claim 18, characterized in that, The monitoring sensor is connected to the energy storage body of the downhole lifting energy storage pipe string, and the energy storage body provides electric energy for the monitoring sensor.

20. A downhole lifting energy storage method, characterized in that, The method is implemented by using the downhole lifting energy storage pipe string according to any one of claims 1-16, and the method includes: Driving the mover assembly of the power generation body to reciprocate through a sucker rod to generate electric energy; Storing the generated electric energy through the energy storage body.

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