A magnetohydrodynamic (MHD) connection pump and downhole tubing connection system using the same

Abstract

Various embodiments of a magnetohydrodynamically connected pump are discussed. In some cases, the pump includes a tubular body forming an internal passage, a first connection on a first side of the body, a second connection on a second side of the body; an anode electrode (104) on an inner wall of the body; a cathode electrode (105) located on the inner wall of the body opposite the anode electrode (104); and one or more permanent magnets (106) attached to or embedded in an outer wall (141) of the body.

Description

Technical Field

[0001] This application relates to submersible pumps, and more specifically to submersible pumps used in the oil and gas industry. Background Technology

[0002] There are three types of submersible pump systems used in the oil and gas industry: electric submersible pump (ESP) systems, long-shaft pump (LSP) systems, and turbine pump (TP) systems. The most commonly used submersible pump system in downhole operations is the ESP system. The electrical connections of the ESP system are complex and bulky. Summary of the Invention

[0003] This summary is provided to introduce the choice of concepts that will be further described in the following detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid to limit the scope of the claimed subject matter.

[0004] In general, in one aspect, embodiments relate to a magnetohydrodynamic (MHD) connected pump. The pump includes: a tubular body forming an internal channel; a first connection on a first side of the body; a second connection on a second side of the body; an anode electrode on an inner wall of the body; a cathode electrode located on the inner wall of the body opposite to the anode electrode; and one or more permanent magnets attached to or embedded in an outer wall of the body.

[0005] In general, on another aspect, the embodiments relate to a downhole tubing connection system. The system includes at least a first MHD connection pump and a second MHD connection pump. Each of the first and second MHD connection pumps includes: a tubular body forming an internal channel; a first connection portion on a first side of the body; a second connection portion on a second side of the body; an anode electrode on the inner wall of the body; a cathode electrode located on the inner wall of the body opposite to the anode electrode; and one or more permanent magnets attached to or embedded in the outer wall of the body.

[0006] Other aspects of the claimed subject matter will become apparent from the following description and the appended claims. Attached Figure Description

[0007] Specific embodiments of the disclosed technology will now be described in detail with reference to the accompanying drawings. For consistency, similar elements are indicated by similar reference numerals in the various drawings.

[0008] Figures 1A to 1E These are schematic diagrams of different views of an integrated magnetohydrodynamic (MHD) connection pump according to some embodiments.

[0009] Figure 2The various components of an integrated MHD-connected pump that generate net force on a conductive fluid flowing in an internal channel are shown.

[0010] Figure 3 This is a schematic diagram of an MHD connected pump including two permanent magnets according to various embodiments.

[0011] Figures 4A to 4E This is a schematic diagram showing the layout of the permanent magnet and electrodes relative to the cross-section of the MHD-connected pump according to some embodiments.

[0012] Figure 5 A downhole tubing connection system using multiple MHD connection pumps is described according to various embodiments. Detailed Implementation

[0013] In the following detailed description of embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that this disclosure can be practiced without these specific details. In some instances, well-known features have not been described in detail to avoid unnecessarily complicating the description.

[0014] Throughout this application, ordinal numbers (e.g., first, second, third, etc.) may be used as adjectives for elements (i.e., any noun in this application). The use of ordinal numbers does not imply or create any particular order of elements, nor does it limit any element to a single element, unless explicitly disclosed, for example, by the use of the terms "before," "after," "single," and other such terms. Rather, ordinal numbers are used to distinguish between elements. As an example, a first element is different from a second element, and a first element may contain more than one element and be after (or before) the second element in the order of elements.

[0015] In the following description of Figures 1 through 9, in the various embodiments disclosed herein, any component described with respect to the figures may be equivalent to one or more components of the same name described with respect to any other figure. For the sake of brevity, the description of these components will not be repeated for each figure. Thus, each embodiment of a component in each figure is incorporated by reference and is assumed to optionally exist in each other figure having one or more similarly named components. Furthermore, any description of a component in the figures according to the various embodiments disclosed herein shall be interpreted as an alternative embodiment that may be implemented in addition to, in combination with, or in place of the embodiments described with respect to the corresponding components of the same name in any other figure.

[0016] It should be understood that, unless the context clearly specifies otherwise, the singular forms “a,” “an,” and “the” include plural indicators. Thus, for example, referring to “a circuit breaker” includes referring to one or more such circuit breakers.

[0017] Terms such as “approximately” or “substantially” mean that the listed characteristics, parameters, or values ​​do not need to be precisely achieved, but deviations or variations, including, for example, tolerances, measurement errors, measurement accuracy limitations, and other factors known to those skilled in the art, may occur in a quantity that does not preclude the effects that the characteristics are intended to provide.

[0018] Although no multiple dependent claims are introduced, it will be apparent to a person skilled in the art that the subject matter of the dependent claims of one or more embodiments can be combined with other dependent claims.

[0019] Figures 1A to 1E Different views of an integrated magnetohydrodynamic (MHD) connected pump 10 according to some embodiments are shown. Go to Figure 1A The figure shows a cross-sectional view of the MHD-connected pump 10. As shown, the MHD-connected pump 10 includes a tubular body 101. The body 101 forms an internal channel 120 and has an outer wall 141 and an inner wall 142. In some cases, a conductive liquid medium (i.e., a conductive fluid) flows through the internal channel 120.

[0020] Go to Figure 1B The figure shows a first side view of the MHD-connected pump 10. As shown, an external cable 110 on the outer wall 141 is electrically connected to the anode electrode 104 within the internal channel 120. A permanent magnet 106 is attached to, embedded in, or otherwise integrated into the outer wall 141. Although shown as a single permanent magnet, the permanent magnet 106 may include one or more permanent magnets. These one or more permanent magnets may be arranged relative to each other and to the anode electrode 104 and the cathode electrode 105, as described below. Figure 3 and Figures 4A to 4E To be described more fully, the axial direction 145 is shown as a dashed line extending along the body 101.

[0021] In some embodiments, the permanent magnet 106 comprises a solid array of permanent magnets. In various embodiments, the permanent magnet 106 is securely attached to the body of the body 101 to prevent any potential movement of the permanent magnet 106. This can be achieved by using, for example, an epoxy resin adhesive to secure the magnet to the outer wall 141 of the body 101. In one or more embodiments, the permanent magnet 106 is embedded in the body 101 during the manufacture of the body 101. In some embodiments, the outer wall 141 of the body 101 includes a recess along an axial direction 145. In such embodiments, the permanent magnet 106 can be sized to fit within the recess.

[0022] Go to Figure 1C A second side view of the MHD-connected pump 10 is shown, in which the second side view shows the body 101 from... Figure 1AThe body shown in the first side view is rotated upwards by 90 degrees. As shown, an external cable 110 is electrically coupled to the anode electrode 104 via a first conductive element 109 extending from the outer wall 141 to the inner wall 142. An external cable 140 on the outer wall 141 is electrically connected to the cathode electrode 105 via a second conductive element 139. The cathode electrode 105 is located opposite the anode electrode 104. In some embodiments, conductive elements 109 and 139 are each conductive wires inserted during the manufacturing process of the body 101. Such conductive wires may be, but are not limited to, copper wires or bundles of carbon fiber inserted during the manufacturing process of the body 101. Based on the disclosure provided herein, those skilled in the art will recognize that various conductive materials and / or manufacturing processes can be used in combination with different embodiments.

[0023] Go to Figure 1D A first cross-sectional view of the MHD connecting pump 10 is shown. As shown, a first connecting portion 102 is associated with a first side of the MHD connecting pump 10, and a second connecting portion 103 is associated with a second side of the MHD connecting pump 10. A first O-ring 107 is disposed between the first connecting portion 102 and a groove 121. A second O-ring 108 is disposed between the second connecting portion 103 and a groove 122. The first O-ring 107 and the second O-ring 108 can be, but are not limited to, elastomeric and metallic O-rings for preventing the movement of corrosive fluids through the body 101. The first groove 121 and the second groove 122 each have a circular cross-section and are arranged along the axial direction 145 of the body 101. The first connecting portion 102 is connected to the first groove 121, for example, by a thread. The first connecting portion 102 can be a rigid outward tube that can mate with the second groove 122 of another connecting pump (not shown). The second connecting portion 103 can be manufactured by forming threads in the second groove 122. The first connecting portion 102 and the second connecting portion 103 can be threaded connections. Such a threaded connection can be configured to match the threads of one or more components to which the MHD connection pump 10 is intended to be connected.

[0024] Go to Figure 1E The image shows a second cross-sectional view of the MHD-connected pump 10. Figure 1E The second sectional view corresponds to Figure 1D The first sectional view is rotated upwards by 90 degrees.

[0025] In some embodiments, the primary material for the body 101, the first connecting portion 102, and the second connecting portion 103 of the MHD connecting pump 10 is glass fiber reinforced epoxy resin (GRE). GRE can be manufactured using high-strength glass fibers and amine-cured epoxy resin in a fiber winding process to produce a tubular body or tube. Fiber winding is a technique used to manufacture composite materials. In fiber winding, filament yarns or bundles are first wetted with a resin (such as amine-cured epoxy resin) and then wound uniformly and regularly along a predetermined path onto a rotating mandrel. Therefore, this manufacturing process allows for the integration of copper wires or flat objects, such as sensors or larger objects, within the body of the body 101.

[0026] The GRE manufacturing process can be used to produce various bodies exhibiting a wide range of thermomechanical properties. Such thermomechanical properties can be defined as withstanding the temperature rise caused by the activity of the MHD connecting pump, which is formed using a body made of GRE. Therefore, integrating the MHD connecting pump into the tubing can help reduce the overall tubing string size. In various embodiments, the body 101 of the MHD connecting pump 10 may be partially metallic. In such embodiments, an insulator is included between the cathode electrode 105 and the body 101 and / or between the anode electrode 104 and the body 101.

[0027] In some embodiments, the anode electrode 104 and cathode electrode 105 are each formed as a flat metal insert. This flat metal insert can be incorporated into the MHD connection pump 10 during the fabrication of the body 101. The anode electrode 104 and cathode electrode 105 are exposed within the internal channel 120 and are therefore in contact with a conductive fluid flowing through the internal channel 120 of the body 101. In other embodiments, the anode electrode 104 and cathode electrode 105 are each formed by localized deposition of carbon fiber reinforcing strips. In such embodiments, direct contact between the flowing conductive fluid and the carbon material used to form the electrodes is contemplated.

[0028] In various embodiments, graphene or carbon black may be incorporated into a portion of the resin system of one or both of the anode electrode 104 and the cathode electrode 105 to improve the conductivity of the epoxy resin. In some cases, 2.5% carbon black is incorporated into the thermosetting polymer to improve the UV resistance of the GRE tube. In other cases, additional carbon black (i.e., 5% to 7% carbon black) is added to achieve improved conductivity. In other embodiments, other conductive fillers may be used to make it more conductive, such as graphite powder, graphene inclusions, alumina, aluminum nitride, zinc oxide, boron nitride, etc. When the conductive filler is successfully and uniformly distributed on the GRE matrix, a low weight fraction of conductive material is required (0.5% to 6% by weight, as a function of inclusion conductivity, morphology, and percolation threshold, which can drive conductivity even though the inclusions do not have physical interconnections). In some embodiments, a uniformly distributed conductive filler is formed in the epoxy resin. Furthermore, during the fiber winding process combining carbon fiber reinforced tape as electrodes, graphene can be incorporated into the resin system to further improve conductivity and facilitate better direct contact between the fluid and the carbon material, a key criterion for utilizing carbon fiber tape as electrodes. Graphene fibers enhance conductivity due to their high electron mobility. Because of their inherent conductivity, graphene fibers can be used as an efficient and alternative choice for transmitting electrical signals. Moreover, metal electrodes may face challenges in harsh environments, particularly in resisting environmental effects in applications involving 40% H2S and high-temperature gases, and graphene fibers in such environments have been envisioned as an alternative electrode material.

[0029] Go to Figure 2 The diagram illustrates how the various components of the integrated MHD connecting pump 10 generate a net force 212 (F) on the conductive fluid 206 flowing through the internal channel 120. As shown, when the conductive fluid 206 flows through the internal channel 120, the positive charge 202 applied to the anode electrode 104 and the negative charge applied to the cathode electrode 105 maintain an electrostatic field 208 (E) perpendicular to the axial direction 145 of the body 101. The permanent magnet 106 generates a magnetic field 210 (B) also perpendicular to the axial direction 145. In this embodiment, the magnetic field 210 (B) and the electrostatic field 208 (E) are perpendicular to each other. The Lorentz force equation and Ohm's law indicate the perpendicularity of B and E, and their respective strengths, driving a net force 212 (F) applied to the conductive fluid 206 along the axis perpendicular to the axial direction 145 (i.e., the connecting axis).

[0030] Similarly, while the embodiment shown in Figure 1 includes only one permanent magnet 106, MHD connection pumps according to different embodiments may include more permanent magnets distributed at defined locations along the outer wall of a particular MHD connection pump. Due to the above regarding... Figure 2 The direction and intensity of the net force discussed are affected by the strength and relative position of the permanent magnet, such as Figure 3The embodiment in which two permanent magnets (i.e., permanent magnets 306 and 307) are disposed on opposite sides of the MHD connecting pump 30 exhibits similar characteristics to... Figure 1A-1E The net forces of the individual permanent magnet embodiments differ. Permanent magnet 306 is located at a distance of +90 (90) degrees from the anode electrode 304 and -90 (90) degrees from the cathode electrode (not shown). Permanent magnet 307 is located at a distance of +90 (90) degrees from the cathode electrode and -90 (90) degrees from the anode electrode 304.

[0031] As above Figure 2 As implied in the discussion, the direction and strength of net force 212 (F) are influenced by the strength and relative position of one or more permanent magnets. Figures 4A to 4E Various embodiments with different configurations of permanent magnets deployed relative to each other, as well as both the anode electrode 404 and the cathode electrode 405, are shown. Figures 4A to 4E In this process, fluid flows within the internal channel 420 of the main body 401, which is perpendicular to the cross-section shown. This is to facilitate... Figures 4A to 4E As described, the position of the anode electrode 404 on the inner wall of the body 401 is defined as the 12 (12) o'clock position, and the position of the cathode electrode 405 on the inner wall of the body 401 is defined as the 6 (6) o'clock position. It is well known that the 3 (3) o'clock position is located at approximately +90 (90) degrees from the 12 (12) o'clock position (i.e., between 80 (80) degrees and 100 (100) degrees), while the 9 (9) o'clock position is located at approximately -90 (90) degrees from the 12 (12) o'clock position (i.e., between -80 (80) degrees and -100 (100) degrees). The position at 1:30 is approximately +45 (45) degrees from the 12 (12) o'clock position (i.e., between 35 (35) and 55 (55) degrees), and the position at 10:30 is approximately -45 (45) degrees from the 12 (12) o'clock position (i.e., between -35 (35) and -55 (55) degrees). The position at 4:30 is approximately -45 (45) degrees from the 6 o'clock position (i.e., between -35 (35) and -55 (55) degrees), and the position at 7:30 is approximately +45 (45) degrees from the 6 o'clock position (i.e., between 35 (35) and 55 (55) degrees).

[0032] Go to Figure 4A The diagram shows a cross-section of an MHD-connected pump 40 having a single permanent magnet 406 located at the nine (9) o'clock position. The MHD-connected pump 40 is similar to the one described above. Figures 1A to 1E The MHD connection pump 10 is discussed.

[0033] Go to Figure 4BThe cross-section of an MHD connecting pump 41 with two permanent magnets 406 located at the nine (9) o'clock and three (3) o'clock positions, respectively, is shown. The MHD connecting pump 41 is similar to the one described above. Figure 3 The MHD connection pump 30 is discussed.

[0034] Go to Figure 4C The cross-section of the MHD connecting pump 42 with a total of six (6) permanent magnets 406 is shown. Three (3) of the six (6) permanent magnets 406 are located at the nine (9) o'clock position, and another three (3) of the six (6) permanent magnets 406 are located at the three (3) o'clock position.

[0035] Go to Figure 4D The cross-section of the MHD connecting pump 43 with a total of eight (8) permanent magnets 406 is shown. Three (3) of the eight (8) permanent magnets 406 are located at the nine (9) o'clock position, three (3) of the eight (8) permanent magnets 406 are located at the three (3) o'clock position, one (1) of the eight (8) permanent magnets 406 is located at the twelve (12) o'clock position, and one (1) of the eight (8) permanent magnets 406 is located at the six (6) o'clock position.

[0036] Go to Figure 4E The cross-section of the MHD connecting pump 44 with a total of twelve (12) permanent magnets 406 is shown. Three (3) of the twelve (12) permanent magnets 406 are located at the nine (9) o'clock position, three (3) of the twelve (12) permanent magnets 406 are located at the three (3) o'clock position, one (1) of the twelve (12) permanent magnets 406 is located at the twelve (12) o'clock position, one (1) of the twelve (12) permanent magnets 406 is located at the six (6) o'clock position, one (1) of the twelve (12) permanent magnets 406 is located at the one thirty (1:30) o'clock position, one (1) of the twelve (12) permanent magnets 406 is located at the four (4:30) o'clock position, one (1) of the twelve (12) permanent magnets 406 is located at the seven (7:30) o'clock position, and one (1) of the twelve (12) permanent magnets 406 is located at the ten (10:30) o'clock position.

[0037] for Figures 4A to 4E In all the diagrams, there is at least one permanent magnet located at a nine (9) o'clock position or a three (3) o'clock position on the outer wall of the main body 401. When there are two or more permanent magnets 406, all permanent magnets are placed in parallel. In other words, the N poles of all permanent magnets are aligned in the same direction.

[0038] Go to Figure 5Various embodiments depict a downhole tubing connection system 500 using multiple MHD connection pumps 10. The downhole tubing connection system 500 is configured to deliver conductive fluid. The conductive fluid flows in a flow direction 502 to a wellhead device 550. The downhole tubing connection system 500 is connected to the wellhead device 550. The wellhead device 550 can be any pressurized component at the well surface, providing an interface for drilling, completion, and testing throughout all subsea operation phases. The wellhead device 550 can generally refer to an electric motor, booster pump, pump head, etc., to perform the well functions required at the well surface. Based on the disclosure provided herein, those skilled in the art will recognize various wellhead devices that can be used in combination with different embodiments.

[0039] The downhole tubing system 500 includes a casing 504 and tubing 506. Tubing 506 is located within the casing 504. Fracturing fluid can be injected into the casing 504 from the wellhead equipment 550 in direction 503, and conductive current can flow through the tubing 506 in the flow direction 502 to reach the surface of the well.

[0040] The tubing 506 includes two or more MHD connection pumps 510 and two or more conventional connection pumps 512. Such conventional connection pumps 512 can be any conventional pump known in the art, including but not limited to LSP systems, ESP systems, TP systems, and / or combinations thereof. MHD connection pumps 510 can be any MHD connection pump, including but not limited to MHD connection pump 10, MHD connection pump 30, MHD connection pump 40, MHD connection pump 41, MHD connection pump 42, MHD connection pump 43, and / or MHD connection pump 44 as described herein.

[0041] In some embodiments, the MHD connection pumps 510 are uniformly distributed at a predetermined frequency. In various embodiments, the MHD connection pumps 510 are spaced apart from conventional pumps 512. In some of the foregoing embodiments, a first MHD connection pump is located at a first position in the wellbore, and a second MHD pump is located at a second position in the wellbore. A first-type connection pump is located at a third position in the wellbore, wherein the first-type connection pump is different from the first and second MHD connection pumps; and a second-type connection pump is located at a fourth position in the wellbore, wherein the second-type connection pump is different from the first and second MHD connection pumps. In this case, the third position may be between the first and second positions, and the second position may be between the third and fourth positions. In some such cases, both the first-type and second-type connection pumps are intervened conventional pumps 512. The conventional connection pumps 512 may be one type of ESP system, LSP system, TP system, or may include some combinations thereof. In such embodiments, the MHD connection pumps 510 may be considered as a complementary feature to an existing established system and coexist with the ESP system in the well. In some such embodiments, the MHD connection pump 510 provides a backup solution to the ESP system or assists the ESP system during operation to minimize aging and fatigue of the ESP system.

[0042] In one embodiment, an algorithm can be developed to synchronize multiple MHD connections to prevent, for example, hammer flow that is detrimental to the durability of the equipment, or to impose an oscillating flow state to prevent blockage. Such an algorithm can potentially be coupled to computational fluid dynamics software to specify the functional modes of the connections in order to obtain desired results regarding flow velocity, turbulence, etc.

[0043] In one embodiment, the MHD connection pump 510 can be used in a point-like or clustered manner at certain locations along the oil pipe.

[0044] In one embodiment, the downhole tubing system 500 includes only the MHD connection pump 510 and does not include any conventional connection pump 512.

[0045] In some embodiments, the MHD-connected pump 510 can be used to inject fracturing mud from near the surface to a deeper location. Fracturing mud is typically composed of various conductive materials and may otherwise lack conductivity to take advantage of the pumping effect of the MHD connection. Therefore, in one embodiment, the fracturing mud is injected after compensation by adding conductive materials such as metal powder, brine, etc.

[0046] In various embodiments, the MHD connecting pump 510 is integrated as a vaneless pump to influence and / or control the local velocity of the delivered hydrocarbon. The MHD connecting pump 510 influences the flow rate by accelerating or decelerating the conductive medium delivered within the tubing 506.

[0047] In cases involving particularly viscous fluids such as fracturing mud, the ESP system may face challenges such as tubing blockage. In a configuration where the MHD connecting pump 510 is located upstream and / or downstream of the blockage location, remote activation of one or more of the MHD connecting pumps 510 can generate sufficient net force to clear tubing 506. Furthermore, each of the MHD connecting pumps 510 can help control the viscosity of the pumped fluid and replace some of the heaters typically placed along the tubing. This is particularly useful when the goal is to lift heavy crude oil.

[0048] Although the discussion generally concerns hydrocarbons and fracturing fluids, those skilled in the art will understand that the MHD connection pump disclosed herein can be applied to other industrial applications involving the flow of conductive fluids.

[0049] In some embodiments, functionality for safely and efficiently managing the flow of produced hydrocarbons is integrated. Some embodiments may provide important additional features. For example, in the previous example of unclogging pipe 506, the localized heat dissipation effect caused by the MHD connecting pump 510 located upstream and downstream of the blockage may help reduce local viscosity and aid in unclogging.

[0050] Although only a few exemplary embodiments have been described in detail above, those skilled in the art will readily understand that many modifications can be made to the exemplary embodiments without substantially departing from the invention. Therefore, all such modifications are intended to be included within the scope of this disclosure as defined by the appended claims. In the claims, any functional definition is intended to cover the structures described herein that perform the functions and their equivalents. Thus, although nails and screws may not be structurally equivalent, since nails have a cylindrical surface for securing wooden parts together and screws have a helical surface, nails and screws can be equivalent structures in the context of fastening wooden parts.

Claims

1. A magnetohydrodynamic (MHD) connected pump, comprising: Tubular main body (101, 401) forming internal channels (120, 420); A first connecting portion (102) on the first side of the main body; The second connecting portion (103) on the second side of the main body; Anode electrodes (104, 304, 404) on the inner wall (142) of the main body; The cathode electrode (105, 405) is located on the inner wall (142) of the main body at a position opposite to the anode electrode (105, 405); and One or more permanent magnets (106, 306, 307, 406) are attached to or embedded in the outer wall (141) of the body.

2. The connecting pump according to claim 1, in, The anode electrodes (104, 304, 404) and the cathode electrodes (105, 405) maintain an electrostatic field (208) perpendicular to the axial direction (145) of the main body, and wherein the one or more permanent magnets (106, 306, 307, 406) generate a permanent magnetic field (210) perpendicular to the axial direction (145), and The permanent magnetic field (210) is perpendicular to the electrostatic field (208).

3. The connecting pump according to claim 1 or 2, in, Both the anode electrode (104, 304, 404) and the cathode electrode (105, 405) include a flat metal insert that is incorporated during the manufacturing process of the body. The anode electrodes (104, 304, 404) and the cathode electrodes (105, 405) are configured to contact a conductive fluid (206) flowing through the internal channels (120, 420).

4. The connecting pump according to claim 1 or 2, in, The anode electrodes (104, 304, 404) and the cathode electrodes (105, 405) are obtained by local deposition of carbon fiber reinforced strips, and The anode electrodes (104, 304, 404) and the cathode electrodes (105, 405) are configured to contact a conductive fluid (206) flowing through the internal channels (120, 420).

5. The connecting pump according to claim 1 or 2, The anode electrode (104, 304, 404) and the cathode electrode (105, 405) are formed by locally depositing conductive fillers such as graphene, carbon black, or boron nitride onto a thermosetting resin to locally increase conductivity. in, The anode electrodes (104, 304, 404) and the cathode electrodes (105, 405) are configured to contact a conductive fluid (206) flowing through the internal channels (120, 420).

6. The connecting pump according to any one of claims 1 to 5, in, The connecting pump also includes: A first conductor electrically connects the anode electrodes (104, 304, 404) to a first external cable (110). The second wire electrically connects the cathode electrodes (105, 405) to the second external cable (140), and Wherein, at least one of the first conductor and the second conductor includes one or more fiber-wound carbon fiber bundles or copper wires inserted during the manufacturing process of the body (101, 401).

7. The connecting pump according to any one of claims 1 to 6, in, The anode electrodes (104, 304, 404) are located at the 12 o'clock position on the cross-section of the main body, and the cathode electrodes (105, 405) are located at the 6 o'clock position on the cross-section of the main body. At least one permanent magnet (106, 306, 307, 406) is located at the 9 o'clock position or the 3 o'clock position on the cross-section of the main body.

8. The connecting pump according to claim 7, wherein, There are two permanent magnets (306, 307, 406), wherein the first of the two permanent magnets is located at the 9 o'clock position, and the second of the two permanent magnets is located at the 3 o'clock position.

9. The connecting pump according to claim 7, wherein, There are eight permanent magnets (406), wherein three of the eight permanent magnets are located at the 9 o'clock position, three of the eight permanent magnets are located at the 3 o'clock position, one of the eight permanent magnets is located at the 12 o'clock position, and one of the eight permanent magnets is located at the 6 o'clock position.

10. The connecting pump according to claim 7, wherein, There are twelve permanent magnets (406), wherein three of the twelve permanent magnets are located at the 9 o'clock position, three of the twelve permanent magnets are located at the 3 o'clock position, one of the twelve permanent magnets is located at the 12 o'clock position, one of the twelve permanent magnets is located at the 6 o'clock position, one of the twelve permanent magnets is located at the 1:30 o'clock position, one of the twelve permanent magnets is located at the 4:30 o'clock position, one of the twelve permanent magnets is located at the 7:30 o'clock position, one of the twelve permanent magnets is located at the 7:30 o'clock position, and one of the twelve permanent magnets is located at the 10:30 o'clock position.

11. The connecting pump according to any one of claims 7 to 10, wherein, There are two or more permanent magnets (306, 307, 406), wherein the two or more permanent magnets are placed in parallel.

12. The connecting pump according to any one of claims 1 to 11, wherein, The first connecting part (102) and the second connecting part (103) are threaded connecting parts for oil-specific pipes.

13. The connecting pump according to any one of claims 1 to 12, in, The main body (101, 401) includes a first groove (121) and a second groove (122) along the axial direction (145) of the main body. Each of the first groove (121) and the second groove (122) has an opening in the axial direction (145) of the body, and The first connecting portion (102) is formed by forming a thread in the first groove (121), and the second connecting portion (103) is formed by forming a thread in the second groove (122).

14. The connecting pump according to claim 13, wherein, The connecting pump also includes a first O-ring (107) located between the first connecting portion (102) and the first groove (121), and a second O-ring (108) located between the second connecting portion (103) and the second groove (122).

15. The connecting pump according to claim 13 or 14, wherein, The first connecting part (102) is a rigid outward tube that can mate with the second groove (122) of another connecting pump.

16. The connecting pump according to any one of claims 1 to 15, wherein, The main body (101, 401) is formed from glass fiber reinforced epoxy resin (GRE) through a fiber winding process.

17. A downhole tubing connection system (500), the system comprising a first magnetohydrodynamic (MHD) connection pump and a second magnetohydrodynamic (MHD) connection pump, in, Both the first MHD connecting pump and the second MHD connecting pump (510) include: Tubular main body (101, 401) forming internal channels (120, 420); A first connecting portion (102) on the first side of the main body; The second connecting portion (103) on the second side of the main body; Anode electrodes (104, 304, 404) on the inner wall (142) of the main body; The cathode electrode (105, 405) is located on the inner wall (142) of the main body at a position opposite to the anode electrode (104, 304, 404); and One or more permanent magnets (106, 306, 307, 406) are attached to or embedded in the outer wall (141) of the body.

18. The system according to claim 17, wherein, The first MHD connecting pump is located at a first position in the wellbore, wherein the second MHD pump is located at a second position in the wellbore, and wherein the system (500) further includes: A first type of connecting pump located at a third position in the wellbore, wherein the first type of connecting pump is different from the first MHD connecting pump and the second MHD connecting pump; A second type of connecting pump is located at a fourth position within the wellbore, wherein the second type of connecting pump differs from both the first MHD connecting pump and the second MHD connecting pump; and The third position is between the first position and the second position, and the second position is between the third position and the fourth position.

19. The system according to claim 17 or 18, wherein, The first MHD connecting pump and the second MHD connecting pump are used as vaneless pumps to influence the local velocity of the conductive fluid being pumped.

20. The system according to any one of claims 17 to 19, wherein, The system (500) is configured to inject the fracturing mud after a conductive material has been added to it.

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