Oilfield downhole fracturing system and heat exchange device

Abstract

The present application provides an oilfield downhole fracturing system and a heat exchange device. The heat exchange device comprises a housing and a plurality of heat exchange parts; a heat exchange cavity is defined within the housing; the plurality of heat exchange parts are disposed in the heat exchange cavity, and the plurality of heat exchange parts are arranged in a front-rear direction of the housing; each heat exchange part comprises a first ring tube, a second ring tube, and a plurality of heat exchange tubes; the first ring tube faces an opening of the heat exchange cavity, and the second ring tube faces the opening of the heat exchange cavity; in the front-rear direction of the housing, the second ring tube is located behind the first ring tube, and the orthographic projection of the second ring tube onto the first ring tube is located within the first ring tube; the plurality of heat exchange tubes are spaced apart; a first end of each heat exchange tube is connected to the corresponding first ring tube, a second end of each heat exchange tube is connected to the corresponding second ring tube, and each heat exchange tube extends along a spatial curve. In the heat exchange device of the present application, the plurality of heat exchange tubes can fully extend in the heat exchange cavity, increasing the contact area between a second medium and the heat exchange tubes, and improving the heat exchange efficiency.

Description

Oilfield downhole fracturing system and heat exchanger

[0001] This application claims priority to Chinese Patent Application No. 202411619911.2, filed on November 13, 2024, entitled “Oilfield Downhole Fracturing System and Heat Exchange Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to heat exchange equipment, and more particularly to an oilfield downhole fracturing operation system and a heat exchange device. Background Technology

[0003] Heat exchangers are devices that transfer some of the heat from a hot fluid to a cold fluid. They are widely used and play an important role in industrial production. Improving the heat exchange efficiency of heat exchangers has always been a key focus of improvement in this field. Summary of the Invention

[0004] This application provides a heat exchange device to improve heat exchange efficiency.

[0005] In a first aspect, this application provides a heat exchange device, which includes a shell and a plurality of heat exchange sections. The interior of the shell defines a forward-opening heat exchange cavity. The plurality of heat exchange sections are disposed in the heat exchange cavity and arranged along the front-rear direction of the shell. Each heat exchange section includes: a first annular tube with an opening facing the heat exchange cavity; a second annular tube with an opening facing the heat exchange cavity, wherein the second annular tube is located behind the first annular tube in the front-rear direction of the shell, and the orthographic projection of the second annular tube onto the first annular tube is located inside the first annular tube; and a plurality of heat exchange tubes arranged at intervals, wherein a first end of each heat exchange tube is connected to the first annular tube, and a second end of each heat exchange tube is connected to the second annular tube, and each heat exchange tube extends in a spatial curve. The heat exchange device is configured to: introduce a first medium into the second annular tube, the first medium flowing into the first annular tube through the plurality of heat exchange tubes, and introduce a second medium into the heat exchange cavity from front to back, wherein the second medium exchanges heat with the first medium when flowing through the plurality of heat exchange sections.

[0006] In one possible implementation, in each heat exchange section, multiple heat exchange tubes are arranged to be coiled around the same conical surface.

[0007] In one possible implementation, in each heat exchange section, multiple heat exchange tubes are arranged in a spiral curve extending toward the same side.

[0008] In one possible implementation, each heat exchange tube is configured as a finned tube.

[0009] In one possible implementation, the heat exchange device further includes: a connecting portion disposed in the heat exchange chamber, the connecting portion defining a liquid inlet chamber, the connecting portion having a plurality of flow channels communicating with the liquid inlet chamber; the second ring pipes of the plurality of heat exchange portions are all connected to the connecting portion, and the interiors of the plurality of second ring pipes are connected to the plurality of flow channels in a one-to-one correspondence; the heat exchange device is configured to: introduce a first medium into the liquid inlet chamber, the first medium flowing into the second ring pipes of the plurality of heat exchange portions through the plurality of flow channels.

[0010] In one possible implementation, the connecting part further includes a core tube and an inlet connector, the inlet connector being sleeved on the outside of the core tube to form an inlet cavity with the outer wall of the core tube.

[0011] In one possible implementation, multiple flow channels are arranged at intervals along the axial direction of the core tube, and each flow channel is formed in a ring shape on the outer wall of the core tube; multiple second ring tubes of heat exchange sections are sequentially sleeved on the outside of the core tube along the axial direction of the core tube, and the multiple second ring tubes are connected to the multiple flow channels in a corresponding manner; at least one connecting channel is formed on the outer wall of the core tube, one end of each connecting channel is connected to the liquid inlet chamber, and passes through the multiple flow channels along the axial direction of the core tube to connect the liquid inlet chamber and the multiple flow channels.

[0012] In one possible implementation, there are multiple connection channels, which are arranged at intervals along the circumference of the core tube.

[0013] In one possible implementation, the second annular tubes of multiple heat exchange sections are arranged closely along the axial direction of the core tube; and the second annular tubes adjacent to the inlet connector are arranged closely with the inlet connector.

[0014] In one possible implementation, the heat exchange device further includes: an inlet pipe, which passes through the shell, with a first end of the inlet pipe located outside the shell and a second end of the inlet pipe located in the heat exchange chamber. The second end of the inlet pipe is connected to a connecting portion to connect the interior of the inlet pipe with the liquid inlet chamber.

[0015] In one possible implementation, the inlet pipe includes a first pipe section, a second pipe section, and a third pipe section. The first pipe section passes through the shell, the second pipe section is connected to the first pipe section, the second pipe section is located in the heat exchange chamber, and the second pipe section is spirally coiled against the wall of the heat exchange chamber. The two ends of the third pipe section are respectively connected to the second pipe section and the connecting part.

[0016] In one possible implementation, the core tube extends along the front-rear direction of the housing, and the interior of the core tube has a flow channel that extends along the front-rear direction of the housing. When at least part of the second medium flows through the flow channel, it exchanges heat with the first medium in the liquid inlet chamber.

[0017] In one possible implementation, the heat exchange device further includes a baffle plate disposed within the heat exchange cavity, located behind the connecting portion, the baffle plate having a center and an outer edge, the center to the outer edge extending forward and radially toward the core tube to guide the second medium discharged from the flow channel forward and radially toward the core tube.

[0018] In one possible implementation, the heat exchange device further includes: a flow collector shroud, which is disposed inside the heat exchange cavity and located behind the heat exchange section. The flow collector shroud defines a flow collection cavity, and the flow collector shroud has an outlet and multiple inlets. The multiple inlets connect the flow collection cavity and the heat exchange cavity, and the outlet connects the flow collection cavity and the outside of the shell.

[0019] In one possible implementation, the manifold includes a front wall panel, a rear wall panel, and a peripheral wall panel. The front wall panel is close to the heat exchange section, the rear wall panel is opposite to the front wall panel and is located on the side of the front wall panel away from the heat exchange section, and the peripheral wall panel is connected between the front wall panel and the rear wall panel. Multiple inlets are arranged on the front side of the peripheral wall panel, and the outlet is opened at the center of the rear wall panel. The center of the front wall panel protrudes towards the rear wall panel relative to the outer edge.

[0020] In one possible implementation, the heat exchange device further includes: an insulation plate disposed inside the heat exchange cavity and covering the front side of the front wall plate to define the insulation cavity with the front wall plate; the front wall plate has a communication hole for communicating with the collection cavity and the insulation cavity.

[0021] In one possible implementation, the heat exchange device further includes: a manifold, which includes a manifold section and a connecting pipe section. The manifold section is disposed in the heat exchange chamber and communicates with each first ring pipe. The connecting pipe section is connected to the manifold section and passes through the shell.

[0022] In one possible implementation, the manifold section is configured as an annular pipe, located in front of the first annular pipe at the foremost end; the heat exchange device further includes: at least one conductive section, each conductive section including a first connecting joint and a plurality of second connecting joints, the first connecting joint being located on the outer periphery of the manifold section and connected to the manifold section, the plurality of second connecting joints being located on the outer periphery of the first annular pipes of the plurality of heat exchange sections and connected to the plurality of first annular pipes in a corresponding manner, the plurality of second connecting joints being connected sequentially, and the first connecting joint being connected to the second connecting joint at the foremost end.

[0023] In one possible implementation, there are multiple conductive sections, and these multiple conductive sections are arranged circumferentially around the collector pipe section.

[0024] Secondly, this application provides an oilfield downhole fracturing system, including the heat exchange device described above.

[0025] In conjunction with the above technical solutions, the heat exchange device of this application, since the first ring tube and the second ring tube are spaced apart, and the orthogonal projection of the second ring tube onto the first ring tube is inside the first ring tube, when each heat exchange tube extends in a spatial curve, it extends both forward and backward, as well as in the left-right and up-down directions. In this way, each heat exchange tube can fully extend into the heat exchange cavity, increasing the contact area between the second medium and the heat exchange tube, and improving the heat exchange efficiency. Attached Figure Description

[0026] Figure 1 is a perspective view of a heat exchange device according to an embodiment of this application;

[0027] Figure 2 is a perspective view of a heat exchange device according to an embodiment of this application;

[0028] Figure 3 is a cross-sectional view of a heat exchange device according to an embodiment of this application;

[0029] Figure 4 is an exploded view of a heat exchange device according to an embodiment of this application;

[0030] Figure 5 is a schematic diagram of the heat exchange section in a heat exchange device according to an embodiment of this application;

[0031] Figure 6 is an exploded view of the connecting portion in a heat exchange device according to an embodiment of this application;

[0032] Figure 7 is a schematic diagram of the core tube in a heat exchange device according to an embodiment of this application;

[0033] Figure 8 is a schematic diagram showing the installation relationship of the conductive part, the manifold and the heat exchange part in a heat exchange device according to an embodiment of this application;

[0034] Figure 9 is a schematic diagram of the conductive part in a heat exchange device according to an embodiment of this application. Detailed Implementation

[0035] Heat exchangers are devices that transfer some of the heat from a hot fluid to a cold fluid. They are widely used and play an important role in industrial production. Improving the heat exchange efficiency of heat exchangers has always been a key focus of improvement in this field.

[0036] Based on this, this application proposes a uniquely designed heat exchange device. This heat exchange device has a first ring tube and a second ring tube spaced apart, and the orthogonal projection of the second ring tube onto the first ring tube is inside the first ring tube. Multiple heat exchange tubes are connected between the first ring tube and the second ring tube and extend in a spatial curve. Each heat exchange tube can fully extend into the heat exchange cavity, increasing the contact area between the heat exchange medium and the heat exchange tube and improving the heat exchange efficiency.

[0037] The structure and working principle of the heat exchange device in the embodiments of this application are described below with reference to Figures 1 to 9.

[0038] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. used below indicate the orientation or positional relationship based on the orientation of the heat exchange device under a normal operating condition. This is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] Referring to Figures 1, 2, 3, 4, and 5, in some embodiments, the heat exchange device may include a housing 100 and a plurality of heat exchange sections 200. The interior of the housing 100 defines a forward-opening heat exchange chamber 101, and the plurality of heat exchange sections 200 are disposed in the heat exchange chamber 101, arranged along the front-rear direction of the housing 100. Each heat exchange section 200 may include a first annular tube 210, a second annular tube 220, and a plurality of heat exchange tubes 230. The first annular tube 210 faces the opening of the heat exchange chamber 101. The second annular tube 220 faces the opening of the heat exchange chamber 101. In the front-rear direction of the housing 100, the second annular tube 220 is located behind the first annular tube 210, and the orthographic projection of the second annular tube 220 onto the first annular tube 210 is inside the first annular tube 210. Multiple heat exchange tubes 230 are arranged at intervals. The first end of each heat exchange tube 230 is connected to the first ring tube 210, and the second end of each heat exchange tube 230 is connected to the second ring tube 220. Each heat exchange tube 230 extends along a spatial curve.

[0040] The heat exchange device is configured to: introduce a first medium into the second ring pipe 220, the first medium flows into the first ring pipe 210 through multiple heat exchange tubes 230, introduce a second medium into the heat exchange chamber 101, and exchange heat with the first medium when the second medium flows through multiple heat exchange sections 200.

[0041] In this embodiment, the heat exchange device can realize heat exchange between a first medium and a second medium. The first medium can be a gas or a liquid, and the second medium can also be a gas or a liquid. The temperature of the first medium can be higher than the temperature of the second medium, or the temperature of the first medium can be lower than the temperature of the second medium. This application does not impose any particular limitation on this.

[0042] The shell 100 provides a heat exchange chamber 101 for heat exchange. The shell 100 can be insulated to prevent heat loss and to provide safety protection.

[0043] Referring to Figure 3, in some specific embodiments, the housing 100 may be composed of an outer shell 110 and an inner shell 120. The inner shell 120 is disposed inside the outer shell 110, and a heat insulation gap is formed between the inner shell 120 and the outer shell 110. Vacuuming or filling with heat insulation material can be performed in the heat insulation gap to achieve heat insulation of the housing 100.

[0044] In this embodiment, in each heat exchange section 200, the first annular pipe 210 faces the opening of the heat exchange cavity 101, and the second annular pipe 220 faces the opening of the heat exchange cavity 101. The first annular pipe 210 and the second annular pipe 220 are spaced apart in the front-rear direction, and the second annular pipe 220 is located behind the first annular pipe 210. In some specific embodiments, the plane containing the first annular pipe 210 and the second annular pipe 220 may be parallel to the left-right direction of the shell 100.

[0045] Referring to Figure 3, the orthographic projection of the second ring tube 220 onto the first ring tube 210 is inside the first ring tube 210, meaning the diameter of the second ring tube 220 can be set to be smaller than the diameter of the first ring tube 210. In some specific embodiments, the first ring tube 210 and the second ring tube 220 can be coaxially arranged.

[0046] Furthermore, the first ring tube 210 can be shaped as a circular ring, a square ring, or other shapes. Similarly, the second ring tube 220 can be shaped as a circular ring, a square ring, or other shapes. The shapes of the first ring tube 210 and the second ring tube 220 can be the same or different.

[0047] The first ring pipe 210 and the second ring pipe 220 are connected by multiple heat exchange tubes 230. When the first medium is introduced into the second ring pipe 220, the first medium can flow to the first ring pipe 210 through the multiple heat exchange tubes 230. At this time, after the second medium is introduced into the shell 100, the second medium flows through the first ring pipe 210, the multiple heat exchange tubes 230 and the second ring pipe 220 to achieve convective heat transfer.

[0048] In this embodiment, since the first ring pipe 210 and the second ring pipe 220 are spaced apart, and the orthographic projection of the second ring pipe 220 onto the first ring pipe 210 is inside the first ring pipe 210, when each heat exchange tube 230 extends in a spatial curve, it extends in the front-back direction, the left-right direction, and the up-down direction. In this way, each heat exchange tube 230 can fully fill the heat exchange cavity 101, increasing the contact area between the second medium and the heat exchange tube 230 and improving the heat exchange efficiency.

[0049] Furthermore, multiple heat exchange sections 200 are arranged along the front-back direction of the shell 100. Since the multiple heat exchange tubes 230 in each layer are hollowed out, the second medium flows through the multiple heat exchange sections 200 sequentially to achieve sufficient heat exchange. In some specific embodiments, in the front-back direction, the heat exchange tubes 230 of the next layer can be arranged at the hollowed-out parts of the two heat exchange tubes 230 of the previous layer, which facilitates direct contact between the second medium passing through the heat exchange tubes 230 of the previous layer.

[0050] Furthermore, since the second ring pipe 220 is located behind the first ring pipe 210, the first medium is introduced into the second ring pipe 220. The first medium flows from back to front, while the second medium is introduced into the heat exchange chamber 101 from front to back. This creates a counter-current between the first medium and the second medium, further improving the heat exchange efficiency.

[0051] In some embodiments, in each heat exchange section 200, multiple heat exchange tubes 230 are coiled around the same conical surface. In this way, each heat exchange section 200 is generally shaped like a frustum with the first ring tube 210 and the second ring tube 220 as the two bottom surfaces and the conical spiral surface as the side surface. This facilitates the sequential stacking of multiple heat exchange sections 200, reduces the distance between two adjacent heat exchange sections 200, and improves the compactness between multiple heat exchange sections 200.

[0052] Referring to Figures 3, 4 and 5, in some embodiments, in each heat exchange section 200, a plurality of heat exchange tubes 230 are arranged in a spiral curve extending toward the same side. In this way, when the second medium introduced from front to back comes into contact with the plurality of heat exchange tubes 230, the plurality of heat exchange tubes 230 can also guide the second medium to generate a swirling effect and fully exchange heat with each heat exchange section 200.

[0053] In some embodiments, each heat exchange tube 230 is configured as a finned tube. That is, multiple fins are provided on the outer surface of the heat exchange tube 230 to increase the outer surface area and further improve the heat exchange efficiency.

[0054] Referring to Figures 3, 4, 6 and 7, in some embodiments, the heat exchange device may further include a connecting portion 300, which is disposed in the heat exchange chamber 101. The connecting portion 300 defines a liquid inlet chamber 301 and has a plurality of flow channels 312 communicating with the liquid inlet chamber 301.

[0055] The second ring pipes 220 of the multiple heat exchange sections 200 are all connected to the connecting section 300, and the interiors of the multiple second ring pipes 220 are connected to the multiple flow channels 312 in a one-to-one correspondence. The heat exchange device is configured such that a first medium is introduced into the liquid inlet chamber 301, and the first medium flows into the second ring pipes 220 of the multiple heat exchange sections 200 through the multiple flow channels 312.

[0056] In this embodiment, the connecting part 300 may internally define an inlet chamber 301, which is connected to a plurality of flow channels 312. The second ring pipes 220 of the plurality of heat exchange parts 200 are connected to the plurality of flow channels 312 in a one-to-one correspondence. The first medium can be introduced into the inlet chamber 301 through the pipeline, and distributed to the plurality of flow channels 312 in the inlet chamber 301, and then introduced into the plurality of second ring pipes 220 through the plurality of flow channels 312.

[0057] Since multiple heat exchange sections 200 are arranged front to back, and multiple second ring pipes 220 are also arranged front to back, and the multiple second ring pipes 220 are located inside the heat exchange chamber 101, it would be difficult and would affect the overall compactness to design separate delivery pipelines for each of the multiple second ring pipes 220. In this embodiment, a single connecting section 300 can be used to distribute the first medium to the multiple second ring pipes 220, which is simple, convenient, and compact.

[0058] Referring to Figures 3, 4, 6 and 7, the connecting part 300 may further include a core tube 310 and an inlet connector 320. The inlet connector 320 is sleeved on the outside of the core tube 310 to form an inlet cavity 301 with the outer wall of the core tube 310.

[0059] Specifically, the inlet connector 320 is annular in shape with an inwardly open concave cross-section. The inlet connector 320 is sleeved on the outer wall of the core tube 310 so that its opening is sealed by the outer wall of the core tube 310, forming a sealed liquid inlet chamber 301.

[0060] The outer wall of the inlet connector 320 can be connected to the inlet pipe 400 used to transport the first medium, so that the first medium can be introduced into the liquid inlet chamber 301.

[0061] Furthermore, multiple flow channels 312 are arranged at intervals along the axial direction of the core tube 310, and each flow channel 312 is formed annularly on the outer wall of the core tube 310. Multiple second ring pipes 220 of the heat exchange sections 200 are sequentially sleeved on the outside of the core tube 310 along the axial direction, and each second ring pipe 220 is connected to a corresponding flow channel 312. At least one connecting channel 314 is formed on the outer wall of the core tube 310, one end of each connecting channel 314 is connected to the liquid inlet chamber 301, and passes through multiple flow channels 312 along the axial direction of the core tube 310 to connect the liquid inlet chamber 301 with the multiple flow channels 312.

[0062] Specifically, each second ring tube 220 is circular in shape and has an open concave cross-section. The second ring tube 220 is sleeved on the outside of the core tube 310 so that its opening is connected to the opening of the conveying channel 312, thereby realizing the internal connection between the conveying channel 312 and the second ring tube 220.

[0063] There can be one or more connecting channels 314. One end of each connecting channel 314 extends along the axial direction of the core tube 310, and one end can extend into the liquid inlet chamber 301. The other end can pass through multiple intermediate conveying channels 312, extending all the way to the conveying channel 312 farthest from the liquid inlet chamber 301. In this way, each connecting channel 314 can connect the liquid inlet chamber 301 with multiple conveying channels 312 in the axial direction. The multiple conveying channels are connected to the interior of multiple second ring tubes 220 in a one-to-one correspondence, thus realizing the internal connection between the liquid inlet chamber 301 and multiple second ring tubes 220.

[0064] Furthermore, there may be one or more connecting channels 314. Preferably, there may be multiple connecting channels 314, and these multiple connecting channels 314 are arranged at intervals along the circumference of the core tube 310. In this way, multiple connecting channels 314 can be connected to multiple conveying channels 312 simultaneously, thereby improving the efficiency of conveying the first medium.

[0065] Furthermore, the second annular tubes 220 of the multiple heat exchange sections 200 are arranged closely along the axial direction of the core tube 310 to seal the connection channel 314. The second annular tubes 220 adjacent to the inlet connector 320 are arranged closely together with the inlet connector 320.

[0066] Since the connecting channel 314 extends along the axial direction of the core tube 310, and multiple second ring tubes 220 are arranged closely along the axial direction of the core tube 310, and the second ring tubes 220 adjacent to the inlet connector 320 are arranged closely with the inlet connector 320, the connecting channel 314 can be sealed by the inlet connector 320 and the multiple second ring tubes 220 to prevent the first medium in the connecting channel 314 from leaking from the gap between two adjacent second ring tubes 220 and the gap between the second ring tube 220 and the inlet connector 320.

[0067] In addition, sealing gaskets can be installed between two adjacent second ring pipes 220 and between the second ring pipe 220 and the inlet connector 320 to further improve the sealing performance between them.

[0068] Referring to Figure 6, a sealing step 322 is further formed on the inlet connector 320. The inlet connector 320 uses the sealing step 322 to press against the second ring pipe 220 near the inlet connector 320, which can further improve the sealing performance between the second ring pipe 220 and the inlet connector 320.

[0069] Referring to Figure 6, in some embodiments, a baffle plate 318 may also be provided at the front end of the core tube 310.

[0070] When installing the connecting part 300 and the multiple heat exchange parts 200, the multiple second ring tubes 220 can be sequentially inserted into the core tube 310 from back to front, so that the foremost second ring tube 220 abuts against the baffle plate 318 to prevent the second ring tube 220 from coming out; then the inlet connector 320 is inserted into the core tube 310 from back to front; finally, a bolt 330 is driven into the rear end of the inlet connector 320 to squeeze the inlet connector 320 and the multiple second ring tubes 220 tightly.

[0071] Referring to Figure 1, in some embodiments, the heat exchange device may further include an inlet pipe 400, which passes through the housing 100. The first end of the inlet pipe 400 is located outside the housing 100, and the second end of the inlet pipe 400 is located in the heat exchange chamber 101. The second end of the inlet pipe 400 is connected to the connecting part 300 to connect the interior of the inlet pipe 400 with the liquid inlet chamber 301.

[0072] The side wall of the housing 100 may be provided with a through hole 140, the inlet pipe 400 may be inserted through the through hole 140, and the inlet pipe 400 may be fixed in the through hole 140 by the stop block 150 to prevent the inlet pipe 400 from shaking.

[0073] Referring to Figures 3 and 4, in some specific embodiments, the inlet pipe 400 may include a first pipe section 410, a second pipe section 420, and a third pipe section 430. The first pipe section 410 passes through the housing 100, the second pipe section 420 is connected to the first pipe section 410, the second pipe section 420 is located in the heat exchange chamber 101, and the second pipe section 420 is spirally coiled against the wall of the heat exchange chamber 101. The two ends of the third pipe section 430 are respectively connected to the second pipe section 420 and the connecting part 300.

[0074] The second pipe section 420 is spirally coiled against the wall of the heat exchange cavity 101, so that the first medium in the second pipe section 420 can exchange heat with the second medium in the heat exchange cavity 101 in advance. This not only further improves the heat exchange efficiency, but also achieves preheating, increases the temperature of the first medium entering the third pipe section 430, and prevents the first medium from blocking the subsequent passage.

[0075] In some embodiments, the core tube 310 extends along the front-rear direction of the housing 100, and the interior of the core tube 310 has a flow channel 316 that extends through the front-rear direction of the housing 100. When at least part of the second medium flows through the flow channel 316, it exchanges heat with the first medium in the liquid inlet chamber 301. In this way, the second medium in the heat exchange chamber 101 can exchange heat with the first medium in the liquid inlet chamber 301 in advance, which can achieve preheating, increase the temperature of the first medium entering the liquid inlet chamber 301, and prevent the first medium from blocking the liquid inlet chamber 301.

[0076] Referring to Figures 3 and 4, in Figure 3 the dashed line with a solid arrow indicates the second medium. In some embodiments, the heat exchange device may further include a baffle plate 500 disposed within the heat exchange chamber 101, located behind the communication portion 300. The baffle plate 500 has a center and an outer edge, extending radially forward and towards the core tube 310 from the center to the outer edge to guide the second medium discharged from the flow channel 316 forward and radially towards the core tube 310.

[0077] That is, the second medium that passes through the flow channel 316 of the core tube 310 from front to back will not be directly discharged from the heat exchange chamber 101. This part of the second medium is discharged towards the baffle plate 500 and is deflected by the baffle plate 500, and discharged forward and radially towards the core tube 310. The second ring pipe 220 is sleeved on the core tube 310, and this part of the second medium discharged forward and radially towards the core tube 310 will re-contact the heat exchange section 200 to continue heat exchange and achieve sufficient heat exchange.

[0078] Referring to Figures 3 and 4, in some embodiments, the heat exchange device may further include a flow collector 600, which is disposed inside the heat exchange cavity 101 and located behind the heat exchange section 200. The flow collector 600 defines the flow collector 601, and the flow collector 600 has an outlet 650 and a plurality of inlets 640. The plurality of inlets 640 connect the flow collector 601 and the heat exchange cavity 101, and the outlet 650 connects the flow collector 601 and the outside of the housing 100.

[0079] The flow collector 600 is disposed inside the heat exchange chamber 101, located behind the heat exchange section 200. When the second medium flows from front to back through the heat exchange chamber 101, it enters the flow collector 601 through multiple inlets 640 and is discharged from the shell 100 through outlet 650.

[0080] In some specific embodiments, the flow collector 600 may be located on the rear side of the heat exchange chamber 101, and the outlet 650 may be located on the rear side of the flow collector 600. A through hole 130 opposite to the outlet 650 is provided on the rear wall of the housing 100, and the drain pipe 900 can be connected to the outlet 650 through the through hole 130, so that the second medium in the flow collector 601 can be discharged from the heat exchange chamber 101 through the outlet 650.

[0081] Referring to Figure 3, the manifold 600 further includes a front wall plate 610, a rear wall plate 620, and a peripheral wall plate 630. The front wall plate 610 is close to the heat exchange section 200, the rear wall plate 620 is opposite to the front wall plate 610 and located on the side of the front wall plate 610 away from the heat exchange section 200, and the peripheral wall plate 630 connects the front wall plate 610 and the rear wall plate 620. Multiple inlets 640 are arranged on the front side of the peripheral wall plate 630, and an outlet 650 is opened at the center of the rear wall plate 620. The center of the front wall plate 610 protrudes towards the rear wall plate 620 relative to its outer edge.

[0082] The front wall panel 610 and the rear wall panel 620 are opposite each other. The outer edge of the front wall panel 610 is connected to the front end of the peripheral wall panel 630, and the outer edge of the rear wall panel 620 is connected to the rear end of the peripheral wall panel 630. The front wall panel 610 and the rear wall panel 620 together enclose the flow collection cavity 601.

[0083] The front end of the peripheral wall plate 630 can be tilted forward to transition, and the multiple inlets 640 arranged at the front end of the peripheral wall plate 630 can be tilted forward to open, which can improve the efficiency of the second medium entering the collection cavity 601.

[0084] In this embodiment, the outlet 650 is located at the center of the rear wall panel 620, which is opposite to the center of the front wall panel 610. The center of the front wall panel 610 protrudes towards the rear wall panel 620 from its outer edge. This serves two purposes: first, the front wall panel 610 can guide the second medium to flow towards the outlet 650 at the center of the rear wall panel 620; second, it forms a flow collection cavity 601 that gradually narrows from the edge to the center and towards the rear wall panel 620, thereby increasing the flow velocity of the second medium.

[0085] Furthermore, the heat exchange device may also include an insulation plate 510, which is disposed inside the heat exchange cavity 101 and covers the front side of the front wall plate 610, thereby defining the insulation cavity 512 with the front wall plate 610. That is, the insulation cavity 512 is further away from the outlet 650 relative to the collection cavity 601.

[0086] The front wall panel 610 has a connecting hole 612 for connecting the flow collecting cavity 601 and the heat exchange cavity 512. In this way, the second medium in the flow collecting cavity 601 can enter the heat exchange cavity 512 through the connecting hole 612. The second medium in the heat exchange cavity 512 can be used to insulate the flow collecting cavity 601 and the heat exchange cavity 101, thus preventing excessive energy loss of the heat exchange cavity 101 at the flow collecting shroud 600.

[0087] In addition, the connecting port can release the stress of the front wall panel 610 and prevent deformation and other problems caused by temperature changes and untimely stress release before and after use.

[0088] Furthermore, in one embodiment described above, the heat exchange device may also include a baffle plate 500, which is disposed within the heat exchange chamber 101 and located behind the connecting portion 300. The insulation plate 510 is located on the front side of the heat exchange chamber 101, covering the front wall plate 610, and is also located behind the connecting portion 300. Therefore, in some specific embodiments, the baffle plate 500 and the insulation plate 510 can be integrally formed, resulting in a more compact structure.

[0089] Referring to Figures 4 and 8, in some embodiments, the heat exchange device may further include a manifold 700, which may include a manifold section 710 and a connecting section 720. The manifold section 710 is disposed in the heat exchange chamber 101 and communicates with each first annular pipe 210. The connecting section 720 is connected to the manifold section 710 and passes through the housing 100.

[0090] In this embodiment, the first ring pipes 210 of the multiple heat exchange sections 200 are all connected to the manifold section 710. The first medium in each first ring pipe 210 is collected into the manifold section 710 and discharged from the shell 100 through the connecting pipe section 720.

[0091] Referring to Figures 4, 8, and 9, the manifold section 710 is further configured as an annular pipe, located in front of the foremost first annular pipe 210. The heat exchange device may also include at least one conductive section 800, each of which includes a first connecting joint 810 and multiple second connecting joints 820. The first connecting joint 810 is located on the outer periphery of the manifold section 710 and communicates with it. The multiple second connecting joints 820 are correspondingly located on the outer periphery of the first annular pipes 210 of the multiple heat exchange sections 200 and communicate with them accordingly. The multiple second connecting joints 820 are sequentially connected, with the first connecting joint 810 communicating with the foremost second connecting joint 820.

[0092] With this design, the second medium in each first ring pipe 210 first flows into the corresponding second connecting section 820, and then multiple second connecting sections 820 are discharged backward and forward to the front end, and then discharged from the front end second connecting section 820 into the first connecting section 810, and finally enter the manifold section 710.

[0093] Specifically, the last second connecting section 820 has an inlet pipe 400 inserted around the first ring pipe 210 and an outlet pipe extending forward. Each of the remaining second connecting sections 820 has an inlet pipe 400 inserted around the first ring pipe 210, an outlet pipe extending forward, and a connection port for subsequent second connecting sections 820 to connect to. In this way, each second connecting section 820 can be connected to its corresponding first ring pipe 210 and to subsequent second connecting sections 820.

[0094] The first connecting section 810 has an inlet pipe 400 inserted into the periphery of the manifold section 710 and an inlet for the foremost second connecting section 820 to connect to. This allows for connection with the foremost second connecting section 820.

[0095] The first connecting joint 810 and multiple second connecting joints 820 can be fastened together by multiple fasteners to form a whole. Sealing gaskets can be provided between the first connecting joint 810 and the second connecting joint 820, as well as between two adjacent second connecting joints 820, to seal and prevent leakage of the first medium.

[0096] Furthermore, there are multiple conductive sections 800, and these multiple conductive sections 800 are arranged circumferentially around the collector section 710, which can improve the conductivity of the first medium.

[0097] Referring to Figure 4, in addition, a corresponding number of mounting slots 160 can be provided inside the housing 100. Multiple conductive parts 800 can be set in the mounting slots 160. This serves two purposes: first, it can prevent multiple conductive parts 800 from being located inside the heat exchange chamber 101, thus affecting the flow of the second medium; second, it can fix the multiple conductive parts 800 and prevent the conductive parts 800 from shaking.

[0098] This application also provides an oilfield downhole fracturing operation system. The oilfield downhole fracturing operation system is a system that uses fracturing media to create fractures in oil and gas reservoirs during the oil or gas production process. Fracturing is the artificial creation of fractures in the formation, which improves the flow environment of oil underground and increases oil well production. It plays an important role in improving the flow conditions at the bottom of the well, slowing down interlayer movement, and improving the activation of the oil reservoir.

[0099] In some specific embodiments, liquid carbon dioxide is used as the fracturing medium. During operations, the liquid carbon dioxide is stored in tanks and pumped into the reservoir via high-pressure fracturing pumps for fracturing. To maintain a smooth flow of liquid carbon dioxide, the tanks must be pressurized.

[0100] During pressurization, the storage tank can be pressurized by introducing gas. In some specific applications, a portion of the liquid carbon dioxide in the storage tank can be extracted first, and the extracted liquid carbon dioxide can be heated and vaporized using the heat exchange device in any of the above embodiments. Then, the gaseous and liquid carbon dioxide can be discharged back into the storage tank to pressurize it.

[0101] In other words, in this application, the extracted liquid carbon dioxide can be introduced into the heat exchange section 200 as the first medium, and the high-temperature air can be introduced into the heat exchange chamber 101 as the second medium. The liquid carbon dioxide and the high-temperature air exchange heat in the heat exchange chamber 101 so that the liquid carbon dioxide is heated and vaporized.

[0102] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A heat exchange device, characterized by, The device includes a housing (100) and a plurality of heat exchange sections (200), the interior of which defines a forward-opening heat exchange cavity (101), the plurality of heat exchange sections (200) being disposed in the heat exchange cavity (101), and the plurality of heat exchange sections (200) being arranged along the front-rear direction of the housing (100); and each heat exchange section (200) comprising: The first annular pipe (210) has an opening facing the heat exchange chamber (101); The second ring pipe (220) faces the opening of the heat exchange chamber (101). In the front-rear direction of the housing (100), the second ring pipe (220) is located behind the first ring pipe (210), and the orthogonal projection of the second ring pipe (220) onto the first ring pipe (210) is inside the first ring pipe (210). Multiple heat exchange tubes (230) are arranged at intervals. The first end of each heat exchange tube (230) is connected to the first ring tube (210), and the second end of each heat exchange tube (230) is connected to the second ring tube (220). Each heat exchange tube (230) extends in a spatial curve. The heat exchange device is configured to: introduce a first medium into the second ring pipe (220), the first medium flowing into the first ring pipe (210) through a plurality of heat exchange tubes (230), introduce a second medium into the heat exchange cavity (101), and exchange heat with the first medium when the second medium flows through a plurality of heat exchange sections (200).

2. The heat exchange device according to claim 1, characterized in that, In each of the heat exchange sections (200), a plurality of heat exchange tubes (230) are arranged to be coiled around the same conical surface.

3. The heat exchange device according to claim 1, characterized in that, In each of the heat exchange sections (200), a plurality of heat exchange tubes (230) are arranged in a spiral curve extending toward the same side.

4. The heat exchange device according to claim 1, characterized in that, Each of the heat exchange tubes (230) is configured as a finned tube.

5. The heat exchange device according to any one of claims 1 to 4, characterized in that Also includes: A connecting part (300) is disposed in the heat exchange chamber (101), and a liquid inlet chamber (301) is defined in the connecting part (300). The connecting part (300) has a plurality of flow channels (312) communicating with the liquid inlet chamber (301). The second ring pipes (220) of the plurality of heat exchange sections (200) are all connected to the connecting section (300), and the interior of the plurality of second ring pipes (220) is connected to the plurality of flow channels (312) in a one-to-one correspondence; The heat exchange device is configured to introduce the first medium into the liquid inlet chamber (301), and the first medium flows into the second ring pipe (220) of the plurality of heat exchange sections (200) through the plurality of the flow channels (312).

6. The heat exchange device according to claim 5, characterized in that, The connecting part (300) further includes a core tube (310) and an inlet connector (320). The inlet connector (320) is sleeved on the outside of the core tube (310) and forms the liquid inlet chamber (301) with the outer wall of the core tube (310).

7. The heat exchange device according to claim 6, characterized in that, The plurality of the current conveying channels (312) are arranged at intervals along the axial direction of the core tube (310), and each of the current conveying channels (312) is formed annularly on the outer wall of the core tube (310); The second ring pipes (220) of the multiple heat exchange sections (200) are sequentially sleeved on the outside of the core tube (310) along the axial direction of the core tube (310), and the multiple second ring pipes (220) are connected to the multiple flow channels (312) in a one-to-one correspondence; At least one connecting channel (314) is formed on the outer wall of the core tube (310). One end of each connecting channel (314) is connected to the liquid inlet chamber (301) and passes through multiple flow channels (312) along the axial direction of the core tube (310) to connect the liquid inlet chamber (301) with the multiple flow channels (312).

8. The heat exchange device according to claim 7, characterized in that, There are multiple connection channels (314), and the multiple connection channels (314) are arranged at intervals along the circumference of the core tube (310).

9. The heat exchange device according to claim 7, characterized in that, The second annular tubes (220) of the plurality of heat exchange sections (200) are arranged closely along the axial direction of the core tube (310); The second annular pipe (220) adjacent to the inlet connector (320) is closely arranged with the inlet connector (320).

10. The heat exchange device according to claim 5, wherein Also includes: An inlet pipe (400) is provided through the housing (100). The first end of the inlet pipe (400) is located outside the housing (100), and the second end of the inlet pipe (400) is located in the heat exchange chamber (101). The second end of the inlet pipe (400) is connected to the connecting part (300) to connect the interior of the inlet pipe (400) with the liquid inlet chamber (301).

11. The heat exchange device according to claim 10, characterized in that, The inlet pipe (400) includes a first pipe section (410), a second pipe section (420), and a third pipe section (430). The first pipe section (410) passes through the shell (100), the second pipe section (420) is connected to the first pipe section (410), the second pipe section (420) is located in the heat exchange chamber (101), and the second pipe section (420) is spirally coiled against the wall of the heat exchange chamber (101). The two ends of the third pipe section (430) are respectively connected to the second pipe section (420) and the connecting part (300).

12. The heat exchange device according to claim 6, characterized in that, The core tube (310) extends along the front-rear direction of the housing (100), and the interior of the core tube (310) has a flow channel (316) that extends along the front-rear direction of the housing (100). At least a portion of the second medium exchanges heat with the first medium in the liquid inlet chamber (301) when it flows through the flow channel (316).

13. The heat exchange device of claim 12, wherein, Also includes: A baffle plate (500) is disposed within the heat exchange chamber (101) and located behind the connecting portion (300). The baffle plate (500) has a center and an outer edge, the center to the outer edge extending forward and radially toward the core tube (310) to guide the second medium discharged from the flow passage (316) forward and radially toward the core tube (310).

14. The heat exchange device according to any one of claims 1 to 4, characterized by Also includes: A flow collector shroud (600) is disposed inside the heat exchange cavity (101) and located behind the heat exchange section (200). The flow collector shroud (600) defines a flow collector cavity (601). The flow collector shroud (600) has an outlet (650) and multiple inlets (640). The multiple inlets (640) connect the flow collector cavity (601) and the heat exchange cavity (101). The outlet (650) connects the flow collector cavity (601) and the outside of the housing (100).

15. The heat exchange device according to claim 14, characterized in that, The flow collector (600) includes a front wall panel (610), a rear wall panel (620), and a peripheral wall panel (630). The front wall panel (610) is close to the heat exchange section (200), the rear wall panel (620) is opposite to the front wall panel (610) and is located on the side of the front wall panel (610) away from the heat exchange section (200), and the peripheral wall panel (630) is connected between the front wall panel (610) and the rear wall panel (620). Multiple inlets (640) are arranged on the front side of the peripheral wall panel (630), and the outlet (650) is opened at the center of the rear wall panel (620); The center of the front wall panel (610) protrudes toward the rear wall panel (620) from the outer edge.

16. The heat exchange device of claim 15, wherein Also includes: Insulation board (510), the insulation board (510) is disposed in the heat exchange cavity (101) and covers the front side of the front wall plate (610) to define the insulation cavity (512) with the front wall plate (610); The front wall panel (610) has a communication hole (612) for connecting the flow collection cavity (601) and the heat insulation cavity (512).

17. The heat exchange device according to any one of claims 1 to 4, wherein Also includes: The manifold (700) includes a manifold section (710) and a connecting pipe section (720). The manifold section (710) is disposed in the heat exchange chamber (101) and communicates with each of the first ring pipes (210). The connecting pipe section (720) is connected to the manifold section (710) and passes through the shell (100).

18. The heat exchange device according to claim 17, characterized in that, The manifold section (710) is configured as a ring pipe and is located in front of the first ring pipe (210) at the foremost end; The heat exchange device further includes: At least one conductive section (800), each conductive section (800) includes a first connecting joint (810) and a plurality of second connecting joints (820). The first connecting joint (810) is disposed on the outer periphery of the manifold section (710) and is connected to the manifold section (710). The plurality of second connecting joints (820) are disposed one-to-one on the outer periphery of the first ring pipe (210) of the plurality of heat exchange sections (200) and are connected one-to-one with the plurality of first ring pipes (210). The plurality of second connecting joints (820) are connected sequentially. The first connecting joint (810) is connected to the second connecting joint (820) at the foremost end.

19. The heat exchange device according to claim 18, characterized in that, There are multiple conductive parts (800), and the multiple conductive parts (800) are arranged circumferentially around the manifold section (710).

20. An oilfield downhole fracturing system, characterized by, Includes the heat exchange device according to any one of claims 1 to 19.

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