Double-pipeline module sealing packer

Abstract

The utility model discloses a double-pipeline module sealing packer which comprises a central pipe, a packing mechanism and a double-pipeline hydraulic control mechanism. The center pipe is sleeved with a packing mechanism, an upper overflowing opening is formed in the upper portion of the packing mechanism, a lower overflowing opening is formed in the lower portion of the packing mechanism, an overflowing annulus is formed between the center pipe and the packing mechanism, and the lower overflowing opening is communicated with the overflowing annulus; a double-pipeline hydraulic control mechanism is arranged above the packing mechanism, and the double-pipeline hydraulic control mechanism controls the upper overflowing opening to be communicated with or disconnected from the overflowing annulus. Double hydraulic control is adopted, large thrust adjustment can be achieved, rapid position changing of the piston is completed, operation is easy, the mechanical structure is simple, and reliability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to packer technical field, concretely is a kind of double-pipe module sealing packer. BACKGROUND

[0002] Offshore oilfield has experienced four stages of test production stage, rapid production stage, water injection stable production stage, comprehensive adjustment production stage. Implementing water injection development, water injection quality is crucial to the stable production of offshore oilfield, and therefore carrying out separate layer water injection is the trend of the times. At present, hollow single pipe, anti-peristalsis, liquid control type measurement and adjustment integration and double pipe four kinds of water injection pipe column are mainly developed in offshore, and Y341 compression seal, anti-peristalsis expansion seal, liquid control expansion seal and other packers are applied. In view of the problems of packer in offshore oilfield, such as easy to cause damage when going downhole, long time of rubber cylinder unsealing, and no access to reverse well flushing, in order to ensure that the downhole water injection pipe column can work long-term and stably, a packer capable of realizing reverse well flushing under unsealing condition is needed.

[0003] Publication No. CN203685104U discloses a safety protector for oil casing, which comprises a cylinder structure connected from top to bottom by an upper joint, a central pipe and a lower joint, a body provided outside the cylinder structure, a rubber cylinder and a setting and unsetting device provided outside the body and acting on the rubber cylinder, a well flushing control device also provided outside the cylinder structure and connected to the upper end of the body, the setting and unsetting device comprising a push rod sleeve provided outside the body and abutting against the bottom end of the rubber cylinder, an outer sleeve provided outside the push rod sleeve, an annular space formed between the push rod sleeve and the outer sleeve, a piston provided in the annular space, a lock ring provided above the piston in the annular space, the lock ring being fixed to a lock ring fixing sleeve, and the lock ring and the push rod sleeve being connected by a zigzag buckle.

[0004] Publication No. CN206111126U discloses an independent liquid control sliding sleeve type tight insertion, which comprises a central pipe, an outer sleeve, a sliding sleeve, a support sleeve and a T-shaped packing assembly, the sliding sleeve and the support sleeve are provided outside the central pipe, the outer sleeve is provided outside the sliding sleeve, the support sleeve is connected to the outer sleeve through an upper well flushing sleeve at the upper end and connected to a lower joint through a lower well flushing sleeve at the lower end, the sliding sleeve is connected to a plunger assembly at the upper end, a spring annular space and an upper well flushing passage annular space are formed between the sliding sleeve and the central pipe, a lower well flushing passage annular space is formed between the support sleeve and the central pipe, the spring annular space, the upper well flushing passage annular space and the lower well flushing passage annular space are communicated with each other, and radial water holes are formed in the upper well flushing sleeve, the lower well flushing sleeve and the sliding sleeve.

[0005] The above two prior arts open the well flushing passage by pressing the liquid control pipeline, and close the well flushing passage by spring, and the speed and strength of controlling the opening and closing of the well flushing passage are not as good as the utility model.

[0006] The utility model discloses a kind of well flushing well temperature-resistant and pressure-resistant anchoring packers, including center tube, the center tube is successively equipped with backwashing mechanism, sealing mechanism, anchoring support mechanism, righting reversing mechanism, the center tube upper end is connected with prevent mechanism;The backwashing well shell is equipped in transition joint outer wall lower end, and the backwashing well shell lower end is connected with sealing mechanism by backwashing well connecting cone set, and the backwashing well connecting cone set upper end is inner taper;The backwashing well connecting cone set is not contacted with center tube, and spring, balance piston, backwashing well sealing cone, cone set are equipped between center tube and backwashing well shell;The balance piston is equipped outside center tube;The backwashing well sealing cone is equipped between balance piston and backwashing well shell;The cone set is arranged in balance piston lower end, and the cone set is equipped between backwashing well sealing cone and center tube;The spring is arranged in backwashing well sealing cone upper end, and the spring is equipped between backwashing well shell and balance piston.

[0007] The prior art opens the well flushing channel by pressurizing the well flushing fluid, and cannot accurately control the opening and closing of the well flushing channel.

[0008] In summary, the technical solutions of the above disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the utility model, and the above disclosed technology documents do not have technical inspiration for more technical features and technical problems to be solved and beneficial effects of the utility model. Utility model content

[0009] In view of the above defects existing in the prior art, the purpose of the utility model is to provide a double-pipeline module sealing packer.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A double-pipeline module sealing packer, comprising a center tube, further comprising a packer mechanism and a double-pipeline hydraulic control mechanism;The center tube is provided with the packer mechanism, an upper flow passage is arranged above the packer mechanism, a lower flow passage is arranged below the packer mechanism, a flow annulus is arranged between the center tube and the packer mechanism, and the lower flow passage is in communication with the flow annulus;The double-pipeline hydraulic control mechanism is arranged above the packer mechanism, and the double-pipeline hydraulic control mechanism controls the communication or disconnection of the upper flow passage and the flow annulus.

[0012] Further, the double-pipeline hydraulic control mechanism comprises a control center tube and a piston;

[0013] Specifically, the outer wall of the control center tube is provided with an upper sealing ring and a lower sealing ring, and the inner wall of the piston is in sealing contact with the outer wall of the upper sealing ring and the outer wall of the lower sealing ring;

[0014] Specifically, the inner wall of the piston is provided with a force ring between the upper sealing ring and the lower sealing ring, and the force ring is in contact with the outer wall of the control center tube;

[0015] Specifically, the control center tube is provided with a first hydraulic transmission channel and a second hydraulic transmission channel.

[0016] Specifically, one end of the first hydraulic transmission channel is provided with a first hydraulic control pipeline joint, and the other end of the first hydraulic transmission channel is arranged between the upper sealing ring and the force ring.

[0017] Specifically, one end of the second hydraulic transmission channel is provided with a second hydraulic control pipeline joint, and the other end of the second hydraulic transmission channel is arranged between the lower sealing ring and the force ring.

[0018] Specifically, the piston controls the opening and closing of the upper flow port.

[0019] Further, the upper flow port is arranged on the piston, and the upper end of the packer mechanism is connected with a pressure cap.

[0020] Specifically, the annulus between the pressure cap and the control center tube is in communication with the flow annulus, the outer wall of the pressure cap is provided with an outer sealing ring, the inner wall of the piston can be in contact with the outer wall of the outer sealing ring, and the outer wall of the pressure cap is provided with a lower positioning ring below the outer sealing ring.

[0021] Specifically, when the lower end of the piston is in contact with the lower positioning ring, the upper flow port is below the outer sealing ring, and the flow annulus is closed.

[0022] Further, the outer wall of the control center tube is provided with an upper positioning ring above the upper sealing ring.

[0023] Specifically, when the piston is in contact with the upper positioning ring, the upper flow port is between the lower sealing ring and the pressure cap, and the flow annulus is in communication.

[0024] Further, the packer mechanism comprises a conversion joint, a plug sealing center tube, a combined sealing element, a well flushing joint and a lower connector.

[0025] Specifically, the upper end of the conversion joint is connected with the pressure cap, the inner wall of the conversion joint is provided with a connecting convex ring, the connecting convex ring is provided with a bridge type through hole in communication with the upper and lower parts, the inner wall of the connecting convex ring is connected with the outer wall of the lower end of the control center tube at the upper end, and the inner wall of the connecting convex ring is connected with the outer wall of the upper end of the plug sealing center tube at the lower end.

[0026] Specifically, the outer wall of the lower end of the plug sealing center tube is connected with the inner wall of the lower connector, and the outer wall of the upper end of the lower connector is connected with the inner wall of the lower end of the well flushing joint.

[0027] Specifically, the plug seal center pipe lower end outer wall small diameter section, the combined seal is sleeved on the small diameter section outer wall, the well flushing joint upper end is threadedly connected with the small diameter section and compresses the combined seal;

[0028] Specifically, the well flushing joint is provided with a lower flow port.

[0029] Further, the first hydraulic control pipeline joint and the second hydraulic control pipeline joint are arranged on the control center pipe upper end face.

[0030] Further, the outer sealing ring outer wall is provided with a combined check ring, and the combined check ring comprises an outer check ring, a middle check ring and an inner check ring.

[0031] Further, the upper flow port is uniformly arranged at least two along the piston circumferential direction, the lower flow port is uniformly arranged at least two along the well flushing joint circumferential direction, and the bridge type through hole is uniformly arranged at least two along the conversion joint circumferential direction.

[0032] Further, the combined seal is arranged at least two, one spacer ring is arranged between every two combined seals, and the combined seal realizes the upper and lower layer sealing by interference fit.

[0033] Further, the control center pipe upper end is connected with an upper joint, and the lower joint is connected with a lower joint.

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] 1. The utility model discloses a double hydraulic control, can realize big thrust adjustment, completes the quick transposition of piston, simple operation, simple mechanical structure, high reliability.

[0036] 2. The utility model discloses a double liquid passage, namely normal water injection passage and back flushing passage, can realize the large displacement well flushing of not unsealing, guarantees the long -term of downhole string, saves the operation cost. DRAWINGS

[0037] Fig. 1 It is the structure schematic diagram of a double pipeline module sealing packer of the utility model,

[0038] Fig. 2 It is the structure schematic diagram of the control center pipe in the utility model,

[0039] Fig. 3 It is the structure schematic diagram of the piston in the utility model,

[0040] Fig. 4 It is the structure schematic diagram of the pressure cap in the utility model.

[0041] In the figure: upper joint 1, first sealing rubber ring 2, control center tube 3, first hydraulic control pipeline joint 301, second hydraulic control pipeline joint 302, first hydraulic transmission channel 303, second hydraulic transmission channel 304, upper positioning ring 305, upper sealing ring 306, lower sealing ring 307, piston 4, upper overflow port 401, stress ring 402, second sealing rubber ring 5, pressure cap 6, lower positioning ring 601, outer sealing ring 602, outer blocking ring 7, middle blocking ring 8, inner blocking ring 9, conversion joint 10, plug-in sealing center tube 11, combined sealing element 12, spacer ring 13, well washing joint 14, lower connecting head 15, lower joint 16. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0043] Embodiment 1

[0044] Please refer to Figs. 1 to 4 The utility model provides a kind of double pipeline module sealing packer, including center tube, the sealing mechanism is equipped in the outer sleeve of center tube, the upper overflow port 401 is arranged above the sealing mechanism, the lower overflow port is arranged below the sealing mechanism, overflow annulus is arranged between the center tube and sealing mechanism, the lower overflow port is communicated with overflow annulus, double pipeline hydraulic control mechanism is arranged above the sealing mechanism, and the upper overflow port 401 is communicated or disconnected with overflow annulus by double pipeline hydraulic control mechanism.

[0045] Further, the double-pipeline hydraulic control mechanism comprises a control center pipe 3 and a piston 4, the outer wall of the control center pipe 3 is provided with an upper sealing ring 306 and a lower sealing ring 307, the inner wall of the piston 4 is in sealing contact with the outer wall of the upper sealing ring 306 and the outer wall of the lower sealing ring 307, the inner wall of the piston 4 is provided with a force ring 402, the force ring 402 is located between the upper sealing ring 306 and the lower sealing ring 307, the force ring 402 is in sealing contact with the outer wall of the control center pipe 3, the control center pipe 3 is provided with a first hydraulic transmission channel 303 and a second hydraulic transmission channel 304, one end of the first hydraulic transmission channel 303 is provided with a first hydraulic control pipeline joint 301, the other end of the first hydraulic transmission channel 303 is arranged between the upper sealing ring 306 and the force ring 402, one end of the second hydraulic transmission channel 304 is provided with a second hydraulic control pipeline joint 302, the other end of the second hydraulic transmission channel 304 is arranged between the lower sealing ring 307 and the force ring 402; the piston 4 is lowered by pressing the first hydraulic control pipeline joint 301, the piston 4 is raised by pressing the second hydraulic control pipeline joint 302, so as to control the opening and closing of the upper overflow port 401 through the piston 4.

[0046] Specifically, the first hydraulic control pipeline joint 301 and the second hydraulic control pipeline joint 302 are arranged on the upper end face of the control center pipe 3, which is convenient for wiring.

[0047] Specifically, the outer wall of the control center pipe 3 is provided with an upper positioning ring 305 above the upper sealing ring 306, the lower end face of the upper positioning ring 305 can be in contact with the upper end face of the piston 4, and the upper positioning ring 305 is used for upper limiting of the piston 4 to prevent the force ring 402 from being affected by mechanical force.

[0048] Specifically, the sealing between the piston 4 and the control center pipe 3 is realized through the second sealing rubber ring 5.

[0049] Further, the upper overflow port 401 is arranged on the piston 4, the upper end of the sealing mechanism is connected with a pressure cap 6, the annulus between the pressure cap 6 and the control center pipe 3 is in communication with the overflow annulus, the outer wall of the pressure cap 6 is provided with an outer sealing ring 602, the inner wall of the piston 4 can be in sealing contact with the outer wall of the outer sealing ring 602, the outer wall of the pressure cap 6 is provided with a lower positioning ring 601 below the outer sealing ring 602, when the lower end of the piston 4 is in contact with the lower positioning ring 601, the upper overflow port 401 is located below the outer sealing ring 602, and the overflow annulus is closed, when the piston 4 is in contact with the upper positioning ring 305, the upper overflow port 401 is located between the lower sealing ring 307 and the pressure cap 6, and the overflow annulus is in communication.

[0050] Specifically, the outer wall of the outer sealing ring 602 is provided with a combined stop ring, the combined stop ring comprises an outer stop ring 7, a middle stop ring 8 and an inner stop ring 9, so as to ensure the sealing effect.

[0051] Specifically, the upper overflow port 401 is circumferentially and uniformly provided with at least two, and four in the embodiment.

[0052] Further, the sealing mechanism comprises a conversion joint 10, an inserted sealing central pipe 11, a combined sealing element 12, a well flushing joint 14, and a lower connecting head 15. The upper end of the conversion joint 10 is threadedly connected with the pressure cap 6 and sealed. The inner wall of the conversion joint 10 is provided with a connecting convex ring, which is provided with a bridge type through hole communicating between the upper and lower ends. The inner wall of the connecting convex ring is threadedly connected with the outer wall of the lower end of the control central pipe 3 and sealed. The inner wall of the connecting convex ring is threadedly connected with the outer wall of the upper end of the inserted sealing central pipe 11 and sealed. The outer wall of the lower end of the inserted sealing central pipe 11 is threadedly connected with the inner wall of the lower connecting head 15 and sealed. The outer wall of the upper end of the lower connecting head 15 is threadedly connected with the inner wall of the lower end of the well flushing joint 14 and sealed. The lower end of the inserted sealing central pipe 11 is a small diameter section. The combined sealing element 12 is sleeved on the outer wall of the small diameter section. The upper end of the well flushing joint 14 is threadedly connected with the small diameter section and compresses the combined sealing element 12. The well flushing joint 14 is provided with a lower overflow port, so that the well flushing fluid in the overflow channel flows out into the casing.

[0053] Specifically, the annulus between the well flushing joint 14 and the inserted sealing central pipe 11, the annulus between the conversion joint 10 and the inserted sealing central pipe 11, the bridge type through hole, the annulus between the pressure cap 6 and the control central pipe 3, and the space between the pressure cap 6 and the lower sealing ring 307 are flow channels.

[0054] Specifically, the bridge type through hole is circumferentially and uniformly provided with at least two, and three in the embodiment.

[0055] Specifically, the lower overflow port is circumferentially and uniformly provided with at least two, and four in the embodiment.

[0056] Specifically, the combined sealing element 12 is provided with at least two, and a spacer ring 13 is arranged between every two combined sealing elements 12. The combined sealing element 12 realizes the sealing of the upper and lower layers by interference fit.

[0057] Specifically, the upper end of the control central pipe 3 is threadedly connected with the upper joint 1 and sealed. The lower end of the lower connecting head 15 is threadedly connected with the lower joint 16 and sealed.

[0058] Specifically, the unexplained sealing mode is threadedly sealed or sealed by a sealing ring.

[0059] Embodiment 2:

[0060] Based on the embodiment 1, the embodiment 2 provides a use method of the double pipe line module sealing packer, which comprises the following steps:

[0061] In normal production, the first hydraulic control pipeline joint 301 of the control center tube 3 is pressed, the pressure acts on the upper end face of the stress ring 402, the piston 4 is pushed to move downwards, the piston 4 moves to the lower positioning ring 601 of the pressure cap 6 and is limited, the upper overflow port 401 on the piston 4 is opposite to the outer surface of the pressure cap 6, the sealing is realized by the piston 4, the outer blocking ring 7, the middle blocking ring 8, the inner blocking ring 9 and the rubber ring in the annular space of the pressure cap 6, the liquid in the sleeve is prevented from entering the overflow channel, at this time, the overflow channel is closed, and the internal channel of the center tube realizes the water injection function.

[0062] When the reverse washing well operation is needed, the first hydraulic control pipeline joint 301 of the control center tube 3 is depressurized, the second hydraulic control pipeline joint 302 is pressed, the hydraulic oil enters the annular channel between the outer surface of the control center tube 3 and the inner surface of the piston 4, acts on the lower end face of the stress ring 402, the piston 4 is pushed to move upwards, the upper overflow port 401 of the piston 4 is not blocked by the outer surface of the pressure cap 6, the overflow channel is guided, so that the large flow of the washing fluid flows in, the washing fluid flows along the annular channel between the control center tube 3 and the pressure cap 6, the bridge type through hole of the conversion joint 10 and the annular channel of the plug-in sealing center tube 11 and the conversion joint 10, and finally flows out through the lower overflow port of the washing joint 14.

[0063] In the process of field application, the offshore oil field packer has problems of being damaged when going down the well, long unsealing time of the rubber cylinder, and reverse washing well not being smooth, the utility model adopts a hydraulic control mode, has two liquid channels of water injection and well washing, and can realize large flow washing without unsealing, and ensures that the downhole water injection string can work continuously and stably.

[0064] In the application, the parts themselves that are not discussed, and the connection modes of the parts in the application all belong to the known technology in the technical field. Direct application can be used, and details are not repeated.

[0065] In the utility model, the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense. For example, "connection" can be fixed connection, or detachable connection, or integrally connected. "Connected" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0066] In the description of the utility model, it should be understood that the directions or position relations indicated by the terms "upper", "lower", "left", "right", "front", "rear" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular direction, therefore, it cannot be understood as a limitation on the utility model.

[0067] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual tubing string module packer comprising a center tube, characterized by, Also include the sealing mechanism, double pipeline hydraulic control mechanism; The center tube is provided with a sealing mechanism, an upper flow port is arranged above the sealing mechanism, a lower flow port is arranged below the sealing mechanism, a flow annulus is arranged between the center tube and the sealing mechanism, and the lower flow port is in communication with the flow annulus; The sealing mechanism is provided with a double-pipeline hydraulic control mechanism above the sealing mechanism, and the double-pipeline hydraulic control mechanism controls the communication or disconnection of the upper flow port and the flow annulus.

2. A dual tubing string module packer according to claim 1, wherein, The double-pipeline hydraulic control mechanism comprises a control center tube and a piston; The outer wall of the control center tube is provided with an upper sealing ring and a lower sealing ring, and the inner wall of the piston is in sealing contact with the outer wall of the upper sealing ring and the outer wall of the lower sealing ring; The inner wall of the piston is provided with a stress ring, and the stress ring is located between the upper sealing ring and the lower sealing ring, and the stress ring is in sealing contact with the outer wall of the control center tube; The control center tube is provided with a first hydraulic transmission channel and a second hydraulic transmission channel; One end of the first hydraulic transmission channel is provided with a first hydraulic control pipeline joint, and the other end of the first hydraulic transmission channel is arranged between the upper sealing ring and the stress ring; One end of the second hydraulic transmission channel is provided with a second hydraulic control pipeline joint, and the other end of the second hydraulic transmission channel is arranged between the lower sealing ring and the stress ring; The piston controls the opening and closing of the upper flow port.

3. A dual tubing string module packer according to claim 2, wherein, The upper flow port is arranged on the piston, and the sealing mechanism is connected with the pressure cap at the upper end; The annulus between the pressure cap and the control center tube is in communication with the flow annulus, the outer wall of the pressure cap is provided with an outer sealing ring, the inner wall of the piston can be in sealing contact with the outer wall of the outer sealing ring, and the outer wall of the pressure cap is provided with a lower positioning ring below the outer sealing ring; When the lower end of the piston is in contact with the lower positioning ring, the upper flow port is located below the outer sealing ring, and the flow annulus is closed.

4. A dual string modular packer seal according to claim 3, wherein, The outer wall of the control center tube is provided with an upper positioning ring above the upper sealing ring; When the piston is in contact with the upper positioning ring, the upper flow port is located between the lower sealing ring and the pressure cap, and the flow annulus is in communication.

5. A dual-tubular module packer according to claim 3, wherein, The sealing mechanism comprises a conversion joint, an inserted sealing center tube, a combined sealing element, a well flushing joint and a lower connector; The upper end of the conversion joint is connected with the pressure cap, the inner wall of the conversion joint is provided with a connecting convex ring, the connecting convex ring is provided with a bridge type through hole in communication with the upper and lower ends, the inner wall of the connecting convex ring is connected with the outer wall of the lower end of the control center tube, and the inner wall of the connecting convex ring is connected with the outer wall of the upper end of the inserted sealing center tube; The outer wall of the lower end of the inserted sealing center tube is connected with the inner wall of the lower connector, and the outer wall of the upper end of the lower connector is connected with the inner wall of the lower end of the well flushing joint; The outer wall of the lower end of the inserted sealing center tube is a small diameter section, the combined sealing element is sleeved on the outer wall of the small diameter section, and the upper end of the well flushing joint is threadedly connected with the small diameter section and presses the combined sealing element. The well flushing joint is provided with a lower flow port.

6. A dual-tubular module packer according to claim 2, wherein, The first hydraulic control pipeline joint and the second hydraulic control pipeline joint are arranged on the upper end surface of the control center tube.

7. A dual-tubular module packer according to claim 3, wherein, The outer wall of the outer sealing ring is provided with a combined check ring, and the combined check ring comprises an outer check ring, a middle check ring and an inner check ring.

8. A dual-tubular module packer according to claim 5, wherein, The upper flow port is uniformly arranged at least two along the circumference of the piston, the lower flow port is uniformly arranged at least two along the circumference of the well flushing joint, and the bridge type through hole is uniformly arranged at least two along the circumference of the conversion joint.

9. A dual-tubular module packer according to claim 5, wherein, The combination seal is arranged at least two, and a spacer ring is arranged between each two combination seals, and the combination seal realizes the sealing of upper and lower layers by interference fit.

10. A dual-tubular module packer according to claim 5, wherein, The control center pipe upper end is connected with the upper joint, and the lower connector lower end is connected with the lower joint.

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