Expansion tube system

Abstract

This invention provides an expansion tube system. The expansion tube system includes: a ground power and control unit; a tube column assembly; a first connecting assembly, one end of which is connected to the ground power and control unit, and the other end of which is connected to the tube column assembly; an expansion tube assembly, sleeved on the end of the tube column assembly away from the first connecting assembly; a first seal, disposed around the circumferential outer wall of the tube column assembly, with at least a portion of the first seal located inside the end of the expansion tube assembly near the first connecting assembly and contacting the circumferential inner wall of the expansion tube assembly; and a second seal, at least a portion of which extends into the expansion tube assembly from the end of the expansion tube assembly away from the first connecting assembly and seals the end of the expansion tube assembly away from the first connecting assembly, with the other portion of the second seal located outside the expansion tube assembly. This invention solves the problem of discontinuous expansion tube delivery and expansion process in the prior art.

Description

Technical Field

[0001] This invention relates to the field of oil drilling and production technology, and more specifically, to an expansion pipe system. Background Technology

[0002] Expandable tubing technology is widely used in oil and gas wellbore repair, plugging complex formations, and establishing reliable wellbore barriers due to its ability to significantly reduce final wellbore size losses. However, current expandable tubing technology primarily relies on drill pipe or tubing string deployment. When using tubing for deployment, running long horizontal sections of the expandable tubing string presents challenges such as high friction and difficulty in effectively transmitting drilling pressure, leading to limited deployment depth. Furthermore, the expansion process requires repeated splicing of single tubing or the tubing string, resulting in low operational efficiency and discontinuous expansion, causing the expandable tubing thread joints to be subjected to alternating load impacts, increasing the risk of derailment or damage. Drill pipe or tubing deployment requires sophisticated equipment, involves discontinuous operations, has long cycle times, and carries high risks.

[0003] Therefore, the existing technology has the problem of discontinuous expansion tube delivery and expansion process. Summary of the Invention

[0004] The main objective of this invention is to provide an expansion tube system to solve the problem of discontinuous expansion tube delivery and expansion process in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an expansion tube system is provided, comprising: a ground power and control unit; a tubing assembly; a first connecting assembly, one end of which is connected to the ground power and control unit, and the other end of which is connected to the tubing assembly; an expansion tube assembly sleeved on the end of the tubing assembly away from the first connecting assembly; a first seal, disposed around the circumferential outer wall of the tubing assembly, and at least a portion of the first seal being located inside the end of the expansion tube assembly near the first connecting assembly and contacting the circumferential inner wall of the expansion tube assembly; and a second seal, at least a portion of which extends into the expansion tube assembly from the end of the expansion tube assembly away from the first connecting assembly and seals the end of the expansion tube assembly away from the first connecting assembly, and at least another portion of the second seal being located outside the expansion tube assembly.

[0006] Furthermore, the second seal is made of a deformable material.

[0007] Furthermore, the tubing assembly includes multiple tubing bodies connected sequentially. The tubing body located at the end of the multiple tubing bodies is a connecting tubing. The connecting tubing of the tubing assembly is inserted into the tubing of the expansion tube assembly, and at least the connecting tubing among the multiple tubing bodies is rotatable relative to the other tubing bodies.

[0008] Furthermore, the expansion tube system also includes at least one universal joint, and among the multiple tube bodies, at least one connecting tube is connected to an adjacent tube body via a universal joint.

[0009] Furthermore, the first seal is disposed around the circumferential outer wall of the connecting pipe column.

[0010] Furthermore, the first connection assembly includes: a coiled tubing, one end of which is connected to the ground power and control unit; and a connector, the other end of which is connected to the tubing assembly.

[0011] Furthermore, the connector includes: a safety connector, the other end of the coiled tubing being connected to the safety connector; and a docking mechanism, the safety connector being snap-fitted or threadedly connected to the docking mechanism, and the docking mechanism being fixedly connected to the tubing assembly.

[0012] Furthermore, the ground power and control unit includes: a continuous oil pipeline machine, with a continuous oil line connected to the continuous oil pipeline machine; and a pressure pump truck, with the pressure pump truck connected to the continuous oil pipeline machine.

[0013] Furthermore, the ground power and control unit also includes a real-time pump pressure monitoring and control component, which is connected to the oilfield workover unit and the pressurization pump truck via signal connection.

[0014] Furthermore, the second seal includes a rubber cup.

[0015] Applying the technical solution of this invention, the expansion tube system of this application includes: a ground power and control unit; a tubing assembly; a first connecting assembly, one end of which is connected to the ground power and control unit, and the other end of which is connected to the tubing assembly; an expansion tube assembly, which is sleeved on the end of the tubing assembly away from the first connecting assembly; a first seal, which is disposed around the circumferential outer wall of the tubing assembly, and at least a portion of the first seal is located inside the end of the expansion tube assembly near the first connecting assembly and contacts the circumferential inner wall of the expansion tube assembly; a second seal, at least a portion of which extends into the expansion tube assembly from the end of the expansion tube assembly away from the first connecting assembly and seals the end of the expansion tube assembly away from the first connecting assembly, and at least another portion of the second seal is located outside the expansion tube assembly.

[0016] When using the expansion tube system of this application, the expansion tube system includes a surface power and control unit, a tubing assembly, a first connecting assembly, an expansion tube assembly, a first seal, and a second seal. The first seal is disposed around the circumferential outer wall of the tubing assembly, and at least a portion of it is located inside the expansion tube assembly near the first connecting assembly, and directly contacts the circumferential inner wall of the expansion tube assembly, forming an internal sealing constraint on the end of the expansion tube assembly near the first connecting assembly. At least a portion of the second seal extends into the expansion tube assembly from the end away from the first connecting assembly, completely sealing the port, while at least another portion extends to the outside of the expansion tube assembly, constructing an isolation barrier to the external environment. Through the synergistic effect of the first seal and the second seal, a bidirectional sealing structure is established at both ends of the expansion tube assembly during its lowering and expansion, effectively preventing leakage of fluid in the wellbore along the gap between the expansion tube assembly and the tubing assembly, or preventing formation fluids, mud, and other external media from intruding into the interior of the expansion tube assembly. Meanwhile, in this application, the cooperation of the first and second sealing elements creates a sealed cavity inside the expansion tube assembly, forming an airbag-like structure that reduces the relative weight of the expansion tube string and the frictional resistance between the expansion tube string and the original sleeve. Furthermore, the cooperation between the ground power and control unit and the first connecting assembly enables continuous operation of the expansion tube assembly's delivery and expansion, eliminating the need for repeated connection of single tubes or columns. This solves the problem of inefficiency caused by the non-continuous delivery and expansion of expansion tubes in existing technologies, which require repeated connection of single tubes or columns, thus improving operational efficiency. Therefore, the expansion tube system in this application effectively solves the problem of discontinuous delivery and expansion processes in existing technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of an expansion tube system according to a specific embodiment of the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Ground power and control unit; 11. Oil handling machine; 12. Pressure pump truck; 13. Pump pressure real-time monitoring and control component; 20. Tubing assembly; 21. Tubing body; 211. Connecting tubing; 30. First connecting assembly; 31. Coiled tubing; 32. Safety joint; 33. Docking mechanism; 40. Expansion tube assembly; 50. First seal; 60. Second seal; 70. Universal joint. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0024] To address the problems of discontinuous expansion tube delivery and expansion process in existing technologies, this application provides an expansion tube system.

[0025] like Figure 1 As shown, the expansion tube system of this application includes: a ground power and control unit 10; a tube column assembly 20; a first connecting assembly 30, one end of which is connected to the ground power and control unit 10, and the other end of which is connected to the tube column assembly 20; an expansion tube assembly 40, which is sleeved on the end of the tube column assembly 20 away from the first connecting assembly 30; a first seal 50, which is disposed around the circumferential outer wall of the tube column assembly 20, and at least a portion of the first seal 50 is located inside the end of the expansion tube assembly 40 near the first connecting assembly 30 and contacts the circumferential inner wall of the expansion tube assembly 40; and a second seal 60, at least a portion of which extends into the expansion tube assembly 40 from the end of the expansion tube assembly 40 away from the first connecting assembly 30 and seals the end of the expansion tube assembly 40 away from the first connecting assembly 30, and at least another portion of the second seal 60 is located outside the expansion tube assembly 40.

[0026] When using the expansion tube system of this application, the expansion tube system includes a ground power and control unit 10, a tube string assembly 20, a first connecting assembly 30, an expansion tube assembly 40, a first seal 50, and a second seal 60. The first seal 50 is disposed around the circumferential outer wall of the tube string assembly 20, and at least a portion is located inside the expansion tube assembly 40 near the end of the first connecting assembly 30, directly contacting the circumferential inner wall of the expansion tube assembly 40 to form an internal sealing constraint on the end of the expansion tube assembly 40 near the first connecting assembly 30; the second seal 60... At least a portion of the expansion tube assembly 40 extends into its interior from the end furthest from the first connecting assembly 30, completely sealing that port. Simultaneously, at least another portion extends to the outside of the expansion tube assembly 40, creating an isolation barrier against the external environment. Through the synergistic action of the first sealing element 50 and the second sealing element 60, a bidirectional sealing structure is established at both ends of the expansion tube assembly 40 during its insertion and expansion, effectively preventing fluid leakage from the wellbore along the gap between the expansion tube assembly 40 and the tubing assembly 20, or preventing formation fluids, mud, and other external media from intruding into the interior of the expansion tube assembly 40. Furthermore, in this application, the cooperation of the first and second sealing elements allows a sealed cavity to be formed inside the expansion tube assembly, creating a structure similar to an airbag. This reduces the relative weight of the expansion tube string and decreases the frictional resistance between the expansion tube string and the original casing. Furthermore, in this application, the cooperation between the ground power and control unit 10 and the first connecting component 30 enables continuous operation of the expansion tube assembly 40's delivery and expansion. This eliminates the need for repeatedly connecting single tubes or columns, thus solving the problem of low efficiency caused by the inability to continuously deliver and expand expansion tubes in the prior art, which requires repeated connection of single tubes or columns. Therefore, the expansion tube system in this application effectively solves the problem of discontinuous delivery and expansion processes in the prior art.

[0027] In this application, the tubing assembly 20 may include multiple drill pipe strings or tubing strings.

[0028] Specifically, the first connection assembly 30 includes: a coiled tubing 31, one end of which is connected to the ground power and control unit 10; and a connector, the other end of which is connected to the tubing assembly 20.

[0029] In one specific embodiment of this application, the ground power and control unit 10 establishes a direct power transmission path through the coiled tubing 31 and the connector. One end of the coiled tubing 31 is connected to the ground power and control unit 10, and the other end is connected to the tubing assembly 20 through the connector. This allows the driving force output by the ground power and control unit 10 to be rigidly transmitted to the connector through the coiled tubing 31, and then transmitted to the tubing assembly 20 without loss through the connector, thereby achieving stable driving and precise control of the expansion tube assembly 40.

[0030] Specifically, the connector includes: a safety connector 32, to which the other end of the coiled tubing 31 is connected; and a docking mechanism 33, to which the safety connector 32 is snap-fitted or threaded, and which is fixedly connected to the tubing assembly 20. Preferably, the docking mechanism 33 is rigidly connected to the tubing assembly 20, thereby enabling power transmission from the coiled tubing 31 to the tubing assembly 20.

[0031] In one specific embodiment of this application, the ground power and control unit 10 transmits power to the joint via the coiled tubing 31. The other end of the coiled tubing 31 is connected to a safety joint 32. The safety joint 32 establishes mechanical coupling with the docking mechanism 33 through a snap-fit ​​connection or a threaded connection. The docking mechanism 33 is then fixedly connected to the tubing assembly 20, thereby achieving stable and efficient power transmission from the coiled tubing 31 to the tubing assembly 20. This structural design solves the problems of unreliable connection and inability to quickly disassemble the coiled tubing 31 and the tubing assembly 20 in traditional technologies, ensuring the axial stability and power continuity of the expansion tube assembly 40 during the lowering process. Furthermore, in this application, the safety joint connects the coiled tubing to the drill pipe or tubing string. If an expansion jamming risk is encountered during the expansion process, the coiled tubing can be detached from the drill pipe or tubing string by throwing a ball or other means.

[0032] Specifically, the ground power and control unit 10 includes: a continuous oil supply unit 11, with a continuous oil line 31 connected to the continuous oil supply unit 11; and a pressure pump truck 12, which is connected to the continuous oil supply unit 11. In this application, the continuous oil supply unit 11 includes a continuous oil line 31 drum, which stores and releases the continuous oil line 31. The pressure pump truck 12 is connected to the drum outlet via a high-pressure pipeline to inject hydraulic medium into the continuous oil line 31.

[0033] In one specific embodiment of this application, the ground power and control unit 10 is connected to the continuous oil pipe 31 via the oil-connecting machine 11 to achieve stable delivery and precise lowering of the expansion tube assembly 40. At the same time, the pressure pump truck 12 is connected to the oil-connecting machine 11 to provide controllable high-pressure hydraulic drive for the system, so that hydraulic power can be transmitted to the expansion tube assembly 40 through the tubing assembly 20, thereby achieving uniform and stable pressure application during the expansion process, effectively avoiding uneven expansion or seal failure caused by pressure fluctuations. The first seal 50 is disposed around the circumferential outer wall of the tubing assembly 20 and embedded in the interior of the expansion tube assembly 40 near the end of the oil-connecting machine 11, forming a radial seal with the circumferential inner wall of the expansion tube assembly 40 to prevent high-pressure fluid from leaking along the gap between the drill pipe or oil pipe and the expansion tube. The second seal 60 extends from the end of the expansion tube assembly 40 away from the oil-connecting machine 11 into its interior and extends to the outside, forming a bidirectional sealing structure at the end, which not only blocks the fluid escape path at the end of the expansion tube, but also ensures reliable isolation between the external environment and the internal high-pressure area. Meanwhile, in this application, the cooperation of the first and second sealing elements enables the expansion tube assembly to form a sealed cavity inside, thereby forming a structure similar to an airbag, which reduces the relative weight of the expansion tube column and the frictional resistance between the expansion tube column and the original sleeve.

[0034] Specifically, the ground power and control unit 10 also includes a real-time pump pressure monitoring and control component 13, which is connected to the oil-working machine 11 and the pressurization pump truck 12 via signal connection. In this application, the real-time pump pressure monitoring and control component 13 is integrated into the operating end of the pressurization pump truck 12, receiving real-time signals of tubing tension, lowering depth, and pump pressure, and dynamically controlling the pump pressure and lowering speed.

[0035] Optionally, the second seal 60 is made of a deformable material. Furthermore, in this application, the second seal 60 can be made of rubber. With this configuration, when the expansion tube assembly 40 expands radially under downhole pressure, the second seal 60, due to the deformable properties of its material, can extend and fit synchronously with the deformation of the inner wall of the expansion tube assembly 40. The portion extending into the expansion tube assembly 40 actively fills the gap between the inner wall of the expansion tube assembly 40 end and the seal, while the other portion located outside the expansion tube assembly 40 also deforms accordingly, forming a double-sealing contact surface. This effectively prevents high-pressure fluid from leaking axially along the end of the expansion tube assembly 40, significantly improving the reliability and adaptability of the distal seal of the expansion tube assembly 40. Especially under conditions of uneven expansion or irregular well walls, the adaptive fitting capability of the deformable material compensates for the risk of seal failure caused by the rigid structure, thereby ensuring the overall sealing quality of the wellbore reconstruction.

[0036] In one specific embodiment of this application, the second sealing element 60 includes a rubber cup. In this embodiment, at least a portion of the rubber cup extends into the expansion tube assembly 40 from the end of the expansion tube assembly 40 away from the first connecting assembly 30, and expands radially under the action of expansion pressure, tightly fitting the circumferential inner sidewall of the expansion tube assembly 40. At the same time, another portion extends to the outside of the expansion tube assembly 40, forming a radial sealing contact with the well wall. The elastic structure of the rubber cup can adaptively fit with the deformation of the expansion tube assembly 40 during the expansion process, effectively avoiding sealing interface failure caused by uneven force or deformation lag of the rigid sealing element, significantly improving the sealing integrity and reliability of the distal end of the expansion tube assembly 40 under high-pressure expansion conditions, thereby ensuring the overall quality of wellbore reconstruction.

[0037] Specifically, the tubing assembly 20 includes multiple tubing bodies 21 connected sequentially. The tubing body 21 located at the end of the multiple tubing bodies 21 is a connecting tubing 211. The connecting tubing 211 of the tubing assembly 20 is inserted into the tubing of the expansion tubing assembly 40, and at least the connecting tubing 211 among the multiple tubing bodies 21 is rotatable relative to the other tubing bodies 21. In this application, the tubing assembly 20 is composed of multiple tubing bodies 21 connected sequentially, with the tubing body 21 located at the end being the connecting tubing 211. The expansion tubing assembly 40 is sleeved on the connecting tubing 211, and at least the connecting tubing 211 among the multiple tubing bodies 21 is rotatable relative to the other tubing bodies 21. When the expansion tubing system is run into the curved section of the wellbore, the connecting tubing 211 can rotate independently to adapt to the local curvature of the wellbore trajectory, thereby avoiding axial bending stress concentration caused by the overall rigidity of the tubing assembly 20.

[0038] Optionally, the expansion tubing system also includes at least one universal joint 70. Among the multiple tubing bodies 21, at least one connecting tubing 211 is connected to an adjacent tubing body 21 via the universal joint 70. When the connecting tubing 211 is connected to an adjacent tubing body 21 via at least one universal joint 70, the universal joint 70 can effectively compensate for the angular deviation between the connecting tubing 211 and the adjacent tubing body 21 caused by the change in the curvature of the wellbore trajectory when the tubing assembly 20 is rotating in a curved wellbore. This eliminates the accumulation of rigid torsional stress, thereby preventing the tubing assembly 20 from jamming or power transmission interruption. It ensures that the expansion tubing assembly 40 maintains axial alignment and stable rotation during the running-in and expansion process, ensuring that the first seal 50 and the circumferential inner wall of the expansion tubing assembly 40 are continuously and tightly fitted. At the same time, it ensures that the sealing area of ​​the second seal 60 at the far end of the expansion tubing assembly 40 is not disturbed by the skew force, maintaining the sealing integrity of its inner and outer ends, and ultimately achieving uniform fit and reliable sealing between the expansion tubing and the well wall.

[0039] Of course, adjacent column bodies 21 can also be connected by threaded connection in this application.

[0040] Optionally, the first sealing element 50 is disposed around the circumferential outer wall of the connecting tubing string 211. In this embodiment, the first sealing element 50 is disposed around the circumferential outer wall of the connecting tubing string 211, so that the sealing contact relationship between the first sealing element 50 and the circumferential inner wall of the expansion tube assembly 40 is directly bound to the movement state of the connecting tubing string 211. When the other tubing bodies 21 in the tubing string assembly 20 remain stationary while the connecting tubing string 211 rotates relative to them, the first sealing element 50 can rotate synchronously with the connecting tubing string 211, ensuring that it always adheres tightly to the inner wall of the expansion tube assembly 40, avoiding the generation of sealing gaps or sealing failure due to relative displacement or sliding, thereby continuously maintaining the tightness of the wellbore end during the running and expansion of the expansion tube. It also ensures that through the cooperation of the first and second sealing elements, a sealed cavity can be formed inside the expansion tube assembly, so that the expansion tube assembly forms a structure similar to an airbag, thereby reducing the relative weight of the expansion tube string and reducing the frictional resistance between the expansion tube string and the original casing.

[0041] In this application, the first sealing element 50 may be an expansion tube port sealing plug.

[0042] Furthermore, in this application, the expansion tube assembly 40 may include a plurality of expansion tube bodies that are threaded together along the axial direction.

[0043] When using the expansion tube system of this application, fluid is first injected into the coiled tubing via a pressure pump truck to drive the internal expansion cone or hydraulic expansion tool; the coiled tubing real-time monitoring system adjusts the pump pressure and lowering speed according to the operational requirements to achieve a uniform expansion speed of 0.2 to 0.5 m / s. During this period, the universal joint is adjusted in real time according to the bending section of the wellbore to ensure that the expansion tube fits evenly against the well wall; under the action of expansion pressure, the rubber cup undergoes plastic deformation to achieve a full circumferential seal between the expansion tube and the wellbore.

[0044] The main problems in the existing technology are as follows: (1) The friction of long expansion pipe is large and the effective running depth is limited during the running of long expansion pipe in horizontal wells or extended reach wells; (2) Traditional drill pipes need to repeatedly swing single pipes / columns to deliver expansion pipes, resulting in discontinuous expansion process and low efficiency; (3) The discontinuity and speed fluctuation of the expansion process cause the expansion pipe thread joint to be subjected to significant alternating load impact, increasing the risk of derailment or damage; (4) The existing technology lacks effective means to reduce the friction of long pipe string running and achieve continuous uniform speed control of the expansion process.

[0045] This system provides solutions through the following innovative designs: using coiled tubing to achieve "one-trip drilling" for both insertion and expansion, eliminating the need for repeated splicing of single tubes / columns, fundamentally solving problem (2) and significantly improving operational efficiency; injecting low-density media into the sealed cavity to create a "floating effect," effectively reducing the weight of the tubing string and significantly reducing the friction of the long horizontal section during insertion, solving the problem of high friction and limited effective insertion depth during insertion, and increasing the effective insertion depth; through coiled tubing, a real-time monitoring and control system for coiled tubing, and a coiled tubing workover machine pressurization pump truck, the insertion depth, tension, and pump pressure data of the tubing can be dynamically monitored, and the expansion speed and insertion force can be precisely controlled to achieve uniform, continuous, and constant-speed expansion, effectively avoiding fluctuations in expansion speed, thereby completely eliminating the harm of alternating load impact to the threaded joint in problem (3), significantly reducing the risk of derailment or damage, and improving the quality and reliability of expansion; finally, the combination of constant-speed expansion and drill-free grinding synergistically reduces operational risks (an extension of problem (5)), and improves operational safety and wellbore reconstruction quality assurance.

[0046] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: This application has achieved a dual breakthrough in theoretical methods and engineering applications in the field of wellbore reconstruction, systematically solving key common technical problems such as high friction during the running of long horizontal expansion tubes, discontinuous expansion process, damage to threaded joints, and high risks in drilling and grinding the wellbore. In terms of theoretical methods, a "closed-cavity fluid dynamics drag reduction model" is proposed for the first time. By injecting a low-density medium into the closed cavity formed by the coiled tubing and expansion tube assembly, the positive pressure between the tubing string and the well wall is significantly reduced by utilizing the buoyancy effect, overcoming the theoretical limitations of traditional lubricant drag reduction. In terms of process design, an innovative collaborative mechanism of "coiled tubing constant displacement drive + floating drilling" is adopted. Precise displacement control using the coiled tubing work vehicle, pressure pump truck, and real-time pump pressure monitoring and control system on the ground achieves uniform speed movement of the expansion cone, fundamentally eliminating speed fluctuations and alternating load impacts caused by the single-joint splicing of traditional drill pipes. This technology is in a leading position in all key indicators. First, it significantly reduces the friction during drilling, representing a qualitative leap compared to traditional technologies. Second, it significantly reduces the failure risk of expansion pipe threaded joints, greatly controlling the accident rate. Third, it achieves a leapfrog improvement in operational efficiency, saving a significant amount of time per well. Fourth, it innovatively eliminates the drilling and grinding process, thereby fundamentally preventing wellbore damage.

[0047] This application provides a high-efficiency wellbore reconstruction system for coiled tubing expansion tubing. By injecting a low-density medium into a sealed cavity to create a "floating effect," it significantly reduces friction during the long horizontal run, increasing the effective running depth. It enables continuous, uniform expansion operations in a single drilling run, eliminating the traditional drill pipe splicing process and subsequent drilling and grinding procedures. This significantly shortens the single-well operation cycle, directly reducing labor and equipment costs. In terms of performance improvement, uniform expansion control greatly reduces the impact of alternating loads on the threaded joints, significantly decreasing the rate of expansion tubing disconnection. The energy-saving and emission-reduction benefits are significant: single-well diesel consumption is reduced, and the amount of drilling waste to be disposed of is also decreased.

[0048] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An expansion tube system, characterized in that, include: Ground power and control unit (10); Pipeline assembly (20); A first connecting assembly (30) is connected at one end to the ground power and control unit (10) and at the other end to the column assembly (20). An expansion tube assembly (40) is sleeved on the end of the tube column assembly (20) away from the first connecting assembly (30); A first seal (50) is disposed around the circumferential outer wall of the tubing assembly (20), and at least a portion of the first seal (50) is located inside the expansion tube assembly (40) near the end of the first connecting assembly (30) and contacts the circumferential inner wall of the expansion tube assembly (40). A second seal (60) is provided, at least a portion of which extends into the expansion tube assembly (40) from one end of the expansion tube assembly (40) away from the first connecting assembly (30) and seals the end of the expansion tube assembly (40) away from the first connecting assembly (30), and at least another portion of the second seal (60) is located outside the expansion tube assembly (40).

2. The expansion tube system according to claim 1, characterized in that, The second seal (60) is made of a deformable material.

3. The expansion tube system according to claim 1, characterized in that, The tubing assembly (20) includes a plurality of tubing bodies (21) connected sequentially. The tubing body (21) located at the end of the plurality of tubing bodies (21) is a connecting tubing (211). The connecting tubing (211) of the tubing assembly (20) is inserted into the tubing of the expansion tube assembly (40), and at least the connecting tubing (211) of the plurality of tubing bodies (21) is rotatable relative to the other tubing bodies (21).

4. The expansion tube system according to claim 3, characterized in that, The expansion tube system also includes at least one universal joint (70), and of the plurality of tube bodies (21), at least the connecting tube (211) is connected to the adjacent tube body (21) via the universal joint (70).

5. The expansion tube system according to claim 3, characterized in that, The first seal (50) is disposed around the circumferential outer wall of the connecting column (211).

6. The expansion tube system according to any one of claims 1 to 5, characterized in that, The first connection component (30) includes: A continuous tubing (31), one end of which is connected to the ground power and control unit (10); The other end of the continuous tubing (31) is connected to the tubing assembly (20) via the joint.

7. The expansion tube system according to claim 6, characterized in that, The connector portion includes: Safety joint (32), the other end of the continuous tubing (31) is connected to the safety joint (32); The docking mechanism (33) is connected to the safety connector (32) by a snap-fit ​​or threaded connection, and the docking mechanism (33) is fixedly connected to the pipe column assembly (20).

8. The expansion tube system according to claim 6, characterized in that, The ground power and control unit (10) includes: Oil continuous operation machine (11), the continuous oil pipe (31) is connected to the oil continuous operation machine (11); A pressure pump truck (12) is connected to the oil-continuous operation machine (11).

9. The expansion tube system according to claim 8, characterized in that, The ground power and control unit (10) also includes a pump pressure real-time monitoring and control component (13), and the pump pressure real-time monitoring and control component (13) is signal-connected to the oil-working machine (11) and the pressurization pump truck (12).

10. The expansion tube system according to any one of claims 1 to 5, characterized in that, The second seal (60) includes a rubber cup.

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