Expansion pipe bending expansion experiment device

Abstract

The invention provides an expansion pipe bending expansion experiment device, and relates to the field of oil drilling tool experiment tests.The expansion pipe bending expansion experiment device comprises a base, a supporting mechanism and two clamping mechanisms, and the two clamping mechanisms are arranged at the two ends of the base respectively; the clamping mechanisms are detachably connected with the end of the expansion pipe and fix the end of the expansion pipe, the supporting mechanism comprises a plurality of supporting frames arranged on the base, the multiple supporting frames are sequentially arranged at intervals in the length direction of the base, the supporting frames are used for supporting the expansion pipe and pushing the expansion pipe to move up and down, and the base comprises a plurality of base modules. The multiple base modules are sequentially arranged in the length direction of the base and detachably and fixedly connected. The expansion pipe bending expansion experiment device provided by the invention can truly simulate the expansion process of the expansion pipe in a high-inclination bending well section.

Description

Technical Field

[0001] The invention relates to the field of experimental testing of petroleum drilling tools, in particular to an expansion tube bending and expansion experimental device. Background Art

[0002] In oil drilling, the expansion tube is a metal pipe with good ductility and plasticity. After entering the well, it can be mechanically expanded in the radial direction by mechanical or hydraulic methods. It is mainly used to solve the engineering and technical problems such as complex formation isolation, hanger seal hanging, and casing damage repair in the process of oil and gas exploration and development. The expansion tube technology plays an important role in deep and ultra-deep well drilling, shale gas, tight oil and other unconventional oil and gas resources development, and old wellbore transformation. It is a promising oil and gas exploration and development technology.

[0003] Expandable pipes are usually used in complex working conditions such as vicious leakage formations, abnormal well diameter changes, and high-angle well sections, which place extremely high demands on the strength and performance of pipes and supporting tools. In addition to the need to optimize the design of expandable pipes and their supporting tools and improve processing quality, ground tests on expandable pipes are also an important test method for testing the performance of pipes and tools. Accurately testing the performance parameters and application boundary conditions of pipes and tools is a key factor in ensuring the safety of expandable pipe construction. The development of an expandable pipe bending test device is of great significance for studying the expansion mechanism of expandable pipes under complex working conditions of high-angle curved well sections and determining the application limit.

[0004] The expansion pipe bending test device is designed according to the special application environment and use requirements of the expansion pipe. In the prior art, there are few experimental studies on expansion pipe bending working condition simulation test, suspension sealing test and other different working conditions. Patents ZL201010285911.5 and ZL201010507489.3 can only complete the expansion test of the pipe in a straight state. Patent ZL201710021069.6 proposes an expansion pipe bending test platform, which clamps the two ends of the pipe body and bends the pipe body by lifting it up hydraulically in the middle. However, the expansion pipe bending test platform cannot use an expansion cone to simulate the expansion experiment, and the length of the test platform is short, which cannot truly simulate the bending of the expansion pipe in the well.

[0005] In view of this, the inventor has designed an expansion tube bending expansion test device based on many years of production design experience in this field and related fields and through repeated experiments, in order to solve the problems existing in the prior art. Summary of the invention

[0006] The object of the present invention is to provide an expansion pipe bending and expansion test device, which can truly simulate the expansion process of the expansion pipe in a high-angle curved well section.

[0007] In order to achieve the above-mentioned purpose, the present invention proposes an expansion tube bending and expansion test device, wherein the expansion tube bending and expansion test device includes a base, a supporting mechanism and two clamping mechanisms, the two clamping mechanisms are respectively arranged at the ends of the two ends of the base or at positions close to the ends, each of the clamping mechanisms is detachably connected to the end of the expansion tube and fixes the end of the expansion tube, the supporting mechanism includes a plurality of supporting frames arranged on the base, the plurality of supporting frames are sequentially spaced along the length direction of the base, each of the supporting frames is used to support the expansion tube and push the expansion tube to move up and down, the base includes a plurality of base modules, the plurality of base modules are sequentially arranged along the length direction of the base and are detachably fixedly connected.

[0008] Compared with the prior art, the present invention has the following characteristics and advantages:

[0009] The expansion tube bending expansion test device proposed in the present invention has a modular base structure, which is composed of multiple base modules connected in sequence. The number of base modules can be selected according to the length of the experimental specimen (expansion tube), and the length of the base can be adjusted to make the length of the base suitable for different experimental specimens.

[0010] The expansion tube bending and expansion experimental device proposed by the present invention has a base whose length can be extended as the number of base modules increases, thereby simulating the expansion process of the expansion tube in a high-angle curved well section. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0012] Figure 1 A schematic diagram of the initial state of the expansion tube bending and expansion test device proposed by the present invention;

[0013] Figure 2 A schematic diagram of the experimental state of the expansion tube bending and expansion experimental device proposed by the present invention;

[0014] Figure 3 is a schematic diagram of the clamping mechanism in the present invention;

[0015] Figure 4 A three-dimensional diagram of the clamping lower cover in the present invention;

[0016] Figure 5 This is a front view of the clamping lower cover in the present invention;

[0017] Figure 6 A top view of the clamping lower cover in the present invention;

[0018] Figure 7 It is a schematic diagram of an embodiment of an expansion cone in the present invention.

[0019] Description of Reference Numerals

[0020] 100. Expansion tube bending and expansion test device; 10. Base;

[0021] 11. Base module; 20. Support mechanism;

[0022] DETAILED DESCRIPTION

[0023] The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should all be considered to belong to the scope of the present invention.

[0024] like Figures 1 to 7 As shown, the present invention proposes an expansion tube bending and expansion test device 100, which includes a base 10, a support mechanism 20 and two clamping mechanisms 30. The two clamping mechanisms 30 are respectively arranged at the ends of the base 10 at both ends or at positions close to the ends. Each clamping mechanism 30 is detachably connected to the end of the expansion tube 200 and fixes the end of the expansion tube 200. The support mechanism 20 includes a plurality of support frames 21 arranged on the base 10. The plurality of support frames 21 are sequentially spaced along the length direction of the base 10. Each support frame 21 is used to support the expansion tube 200. The base 10 includes a plurality of base modules 11. The plurality of base modules 11 are sequentially arranged along the length direction of the base 10 and are detachably fixedly connected.

[0025] The expansion tube bending expansion test device 100 proposed in the present invention has a modular structure in which the base 10 is composed of a plurality of base modules 11 connected in sequence. The number of base modules 11 can be selected according to the length of the experimental specimen (expansion tube 200), and the length of the base 10 can be adjusted to make the length of the base 10 suitable for the needs of different experimental specimens (expansion tube 200).

[0026] In the expansion tube bending and expansion experimental device 100 proposed by the present invention, the length of the base 10 can be extended as the number of base modules 11 increases, thereby simulating the expansion process of the expansion tube 200 in a high-angle curved well section.

[0027] It should be noted that the highly inclined curved well section is the part with a greater degree of curvature of the wellbore, which is generally referred to as the inclination section of the wellbore. The inclination can be judged based on the well inclination angle. The well inclination angle refers to the angle between the tangent direction of a point on the wellbore trajectory and the direction of the earth's plumb line, ranging from 0° to 180°. The well inclination angle of the highly inclined well section is generally greater than 30°.

[0028] The expansion tube bending expansion test device 100 proposed in the present invention can carry out various types of experimental tests, including bending expansion simulation experiments under different dogleg conditions, bending suspension sealing experiments, bending thread sealing pressure tests and other different experimental projects. The experimental results can provide technical parameter basis for the expansion tube engineering design and construction.

[0029] In an optional embodiment of the present invention, a plurality of expansion pipes 200 are connected by threads to form a long pipe string, and both the pipe body can be subjected to an expansion test (i.e., a bending expansion simulation test) and the threaded connection can be subjected to an expansion test (i.e., a bending thread sealing pressure test).

[0030] In an optional embodiment of the present invention, two adjacent base modules 11 are detachably fixedly connected by bolts.

[0031] In an optional embodiment of the present invention, the base module 11 adopts a steel structure, and the base 10 formed by connecting a plurality of base modules 11 is used to install a supporting mechanism 20 and a clamping mechanism 30 to support the weight of the expansion tube 200 used in the experiment.

[0032] In an optional embodiment of the present invention, the expansion tube bending expansion test device 100 further includes an expansion cone 40 and a fixed joint 50. The expansion cone 40 can be arranged in the expansion tube 200 and seal and slide with the inner wall of the expansion tube 200. The fixed joint 50 is sealed and connected to one end of the expansion tube 200. The fixed joint 50, the expansion cone 40 and the inner wall of the expansion tube 200 enclose a sealed cavity. With the above structure, the expansion experiment is performed by injecting high-pressure fluid into the sealed cavity, thereby pushing the expansion cone 40 to move.

[0033] In an optional example of this embodiment, the fixing joint 50 is threadedly connected to the expansion tube 200 .

[0034] In an optional example of this embodiment, the expansion tube bending expansion test device 100 further includes an injection pipeline 60, an injection channel is provided on the fixed joint 50, one end of the injection channel is connected to the inner cavity of the expansion tube 200, and the other end of the injection channel is connected to the injection pipeline 60. With the above structure, the injection pipeline 60 is directly connected to the fixed joint 50, and then the external high-pressure fluid is injected into the sealed cavity through the injection pipeline 60, and the expansion cone 40 in a sealed form is pushed by the high pressure to move. The above structure is easy to assemble and can effectively improve the experimental efficiency.

[0035] In another optional example of this embodiment, the expansion tube bending expansion test device 100 also includes an injection pipeline 60, and an axially penetrating injection channel 41 is opened on the expansion cone 40, one end of the injection channel 41 is connected to the sealing cavity, and the other end of the injection channel 41 is connected to the injection pipeline 60. With the above structure, the outside of the injection pipeline 60 extends all the way into the expansion tube 200 and is connected to the injection channel 41. During the expansion process, the injection pipeline 60 injects high-pressure fluid from the right side (the end of the injection channel 41 facing away from the fixed joint 50) along the injection channel 41 into the sealing cavity, and the pressure in the sealing cavity increases, thereby pushing the expansion cone 40 to the right. The above expansion form is consistent with the expansion form of the expansion tube in actual use, which can simulate the real expansion process and improve the accuracy of the expansion experiment.

[0036] Furthermore, the expansion cone 40 includes an expansion cone body 42 and a drill rod 43, the expansion cone body 42 is in sealing and sliding cooperation with the inner wall of the expansion tube 200, the drill rod 43 is arranged along the axial direction of the expansion tube 200 and fixedly connected to the side of the expansion cone body 42 facing away from the fixed joint 50, the injection flow channel 41 is arranged along the axial direction of the expansion tube 200, the injection flow channel 41 runs through the expansion cone body 42 and the drill rod 43, and the outer shell of the drill rod 43 is provided with a stabilizing ring 44. With the above structure, the stabilizing ring 44 can ensure that when the expansion cone 40 moves, the drill rod 43 is always located on the axis of the expansion tube 200, so as to ensure the smooth progress of the expansion experiment.

[0037] In an optional embodiment of the present invention, the expansion tube bending expansion test device 100 further includes a pipeline guiding mechanism 70 for guiding the injection pipeline 60, and the pipeline guiding mechanism 70 is disposed at one end of the base 10. With the above structure, the injection pipeline 60 is placed on the pipeline guiding mechanism 70, and the pipeline guiding mechanism 70 assists in arranging the injection pipeline 60, and does not cause problems such as knotting or entanglement of the injection pipeline 60.

[0038] In particular, when the injection pipeline 60 is connected to the expansion cone 40, during the expansion experiment, the injection pipeline 60 moves with the expansion cone 40 and gradually withdraws from the expansion tube 200, avoiding knotting and entanglement under the guidance of the pipeline guiding mechanism 70.

[0039] In an optional example of this embodiment, the guide mechanism 70 is composed of a group of movable brackets connected in series on the guide rail, each movable bracket has a roller at the bottom and can run on the guide rail, each movable bracket has a limiting mechanism for the injection pipeline on the top, and the adjacent movable brackets are connected in series with soft wires to limit their maximum displacement. As the injection pipeline 60 withdraws from the expansion tube 200, each movable bracket is gradually pushed outward on the guide rail. Since the position of the injection pipeline 60 is constrained by the limiting mechanism on the top of the movable bracket, it can only move along the guide rail with the movable bracket, effectively avoiding knotting and entanglement.

[0040] In an optional embodiment of the present invention, the clamping mechanism 30 includes a clamping lower cover 31, a clamping upper cover 32 and two pillars 33. The two pillars 33 are vertically spaced and fixedly connected to the base 10 respectively. The clamping lower cover 31 and the clamping upper cover 32 are semi-cylindrical. The clamping upper cover 32 and the clamping lower cover 31 are buckled to form a cylindrical shape and are detachably connected. The outer wall of the clamping lower cover 31 is convexly provided with mounting blocks 34 that are aligned with the pillars 33, and each mounting block 34 is rotatably connected to the pillars 33. The clamping mechanism 30 is used to fix the expansion tube 200, and the clamping lower cover 31 is rotatably connected with the support 33. During the experiment, according to the dogleg degree required by the experiment, multiple support frames 21 move up to different displacements to bend the expansion tube 200. During the bending process of the expansion tube 200, the clamping mechanisms 30 at both ends can rotate a certain angle to cooperate with the support mechanism 20 to make the expansion tube 200 reach the required bending degree, thereby keeping the bending state and stress state of the expansion tube 200 more in line with the downhole working conditions, and can more realistically simulate the expansion process of the expansion tube 200 underground. The clamping mechanism 30 can cooperate with the support mechanism 20 to adjust the dogleg degree of the expansion tube 200, and can test the maximum full-angle change rate of the safe bending and expansion of the expansion tube 200, and determine the limit boundary conditions of bending and expansion.

[0041] It should be noted that the dogleg angle refers to the angle of change in the direction of the wellbore trajectory from one point to another in the wellbore, and the unit is ° / 30m (i.e. the angle changes every 30m). This angle reflects both the change in the well inclination angle and the change in the azimuth angle, and can also be called the full angle change rate or wellbore curvature.

[0042] In an optional example of this embodiment, the clamping upper cover 32 and the clamping lower cover 31 are detachably connected by bolts.

[0043] In an optional example of this embodiment, the inner wall of the clamping upper cover 32 and the inner wall of the clamping lower cover 31 are respectively detachably mounted with cushion blocks 35 .

[0044] In an optional example, the spacer block 35 is detachably mounted on the clamping upper cover 32 or the clamping lower cover 31 by means of bolts, so that the spacer block 35 is easy to replace and install, thereby improving the experimental efficiency.

[0045] Furthermore, according to different specifications of the expansion tube 200, different specifications of the cushion blocks 35 can be made accordingly, and the cushion blocks 35 of different specifications have different inner diameters, so that the expansion tubes 200 of different specifications can be fixed by the clamping upper cover 32 and the clamping lower cover 31. The clamping mechanism 30 can replace the cushion blocks 35 to match the expansion tubes 200 of different sizes. Before the experiment, the corresponding cushion blocks 35 are selected according to the diameter of the experimental expansion tube 200, and then the cushion blocks 35 are fixed inside the clamping mechanism 30 by bolts.

[0046] In an optional example, the mounting block 34 is rotatably connected to the support column 33 via a bearing, and a slight rotation occurs under the condition that the expansion tube 200 has a dog-leg degree.

[0047] In an optional example, shoulders are provided at both ends of the fixed joint 50 , and a reduced diameter section is provided in the middle, and the reduced diameter section is fixed in the clamping mechanism 30 . The shoulders can limit the axial displacement of the expansion tube 200 .

[0048] In an optional embodiment of the present invention, each support frame 21 pushes the expansion tube 200 to move up and down, so that the expansion tube 200 bends upward into a predetermined shape or curvature (dog-leg degree).

[0049] In an optional embodiment of the present invention, the support frame 21 is a hydraulic support frame, which is mainly used to support the expansion pipe 200 used in the experiment during the experiment to manufacture pipe column bending angles with different dogleg degree change rates. In the initial state, the hydraulic support frame keeps the support point of the expansion pipe 200 and the clamping mechanism 30 horizontal, which can ensure that the expansion pipe 200 is freely placed on the base 10 in a horizontal state.

[0050] In an optional example of this embodiment, the support mechanism 20 is provided with 3-5 hydraulic support frames, each of which is fixed on the base 10 and is mainly used to support the expansion tube 200. The hydraulic support frames push up the expansion tube 200 to form a dog-leg degree. The support mechanism 20 controls the elongation of the piston rod of the hydraulic support frame according to the required dog-leg degree to ensure that the entire section of the expansion tube 200 is evenly subjected to the bending load and accurately controls the dog-leg degree required by the experiment.

[0051] The specific implementation process of the present invention is now described in detail in conjunction with an embodiment:

[0052] like Figure 1 As shown, it is an experimental device in which the support mechanism 20 is in the initial state. After the expansion tube 200 is installed with the fixed joint 50, it is placed horizontally on the base 10, and the expansion tube 200 is fixed at both ends by the clamping mechanism 30. The injection pipeline 60 is placed on the pipeline guiding mechanism 70, and the external high-pressure supply system provides expansion pressure to the expansion tube 200 through the injection pipeline 60. In this state, a horizontal simulated expansion test can be carried out.

[0053] like Figure 2 As shown, after the expansion tube 200 is fixed, the dogleg degree required for the experiment is set, so that each support frame 21 moves up by different displacements to bend the expansion tube 200. During the bending process of the expansion tube 200, the clamping mechanisms 30 at both ends can rotate by a certain angle.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The expansion tube bending expansion test device 100 proposed by the present invention has a modular base 10, which can be assembled according to the length of the experimental specimen (expansion tube 200) to realize the simulated expansion test of the expansion tube;

[0056] The expansion tube bending and expansion test device 100 proposed by the present invention can adjust the inner diameter of the clamping mechanism 30 to meet the requirements of the full-size expansion tube for experimental testing;

[0057] The expansion tube bending and expansion test device 100 proposed by the present invention adopts a rotatable clamping mechanism 30 to ensure that the expansion tube 200 is smoothly bent so that the expansion cone 40 can be expanded smoothly;

[0058] The expansion tube bending and expansion test device 100 proposed by the present invention can simulate the real expansion process. When the injection pipeline 60 withdraws from the expansion tube 200, the pipeline guiding mechanism 70 assists in arranging the line, and will not cause the injection pipeline 60 to become tangled or entangled.

[0059] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. An expansion tube bending and expansion test device, characterized in that: The expansion tube bending and expansion test device includes a base, a supporting mechanism and two clamping mechanisms. The two clamping mechanisms are respectively arranged at the ends of the two ends of the base or at positions close to the ends. Each of the clamping mechanisms is detachably connected to the end of the expansion tube and fixes the end of the expansion tube. The supporting mechanism includes a plurality of supporting frames arranged on the base. The plurality of supporting frames are sequentially spaced along the length direction of the base. Each of the supporting frames is used to support the expansion tube. The base includes a plurality of base modules. The plurality of base modules are sequentially arranged along the length direction of the base and are detachably fixedly connected.

2. The expansion tube bending expansion test device according to claim 1, characterized in that: The expansion tube bending expansion test device also includes an expansion cone and a fixed joint. The expansion cone is arranged in the expansion tube and sealingly and slidingly cooperates with the inner wall of the expansion tube. The fixed joint is sealingly connected to one end of the expansion tube. The fixed joint, the expansion cone and the inner wall of the expansion tube enclose a sealed cavity.

3. The expansion tube bending expansion test device according to claim 2, characterized in that: The expansion tube bending expansion test device also includes an injection pipeline. The fixed joint is provided with an injection channel. One end of the injection channel is connected to the sealing cavity, and the other end of the injection channel is connected to the injection pipeline.

4. The expansion tube bending expansion test device according to claim 2, characterized in that: The fixed joint closes the end of the expansion tube. The expansion tube bending expansion test device also includes an injection pipeline. An axially penetrating injection channel is opened on the expansion cone. One end of the injection channel is connected to the sealing cavity, and the other end of the injection channel is connected to the injection pipeline.

5. The expansion tube bending expansion test device according to claim 4, characterized in that: The expansion cone includes an expansion cone body and a drill rod. The expansion cone body is sealingly and slidingly matched with the inner wall of the expansion tube. The drill rod is arranged along the axial direction of the expansion tube and fixedly connected to the side of the expansion cone body facing away from the fixed joint. The injection channel runs through the expansion cone body and the drill rod. A straightening ring is provided on the outer sleeve of the drill rod.

6. The expansion tube bending expansion test device according to claim 3 or 4, characterized in that: The expansion tube bending and expansion test device further comprises a pipeline guiding mechanism for guiding the injection pipeline, and the pipeline guiding mechanism is arranged at one end of the base.

7. The expansion tube bending expansion test device according to claim 1, characterized in that: The clamping mechanism includes a clamping lower cover, a clamping upper cover and two pillars, the two pillars are vertically spaced and fixedly connected to the base respectively, the clamping lower cover and the clamping upper cover are semi-cylindrical, the clamping upper cover and the clamping lower cover are buckled to form a cylindrical shape and are detachably connected, the outer wall of the clamping lower cover is convexly provided with mounting blocks that are aligned with the pillars, and each mounting block is rotatably connected to the pillars.

8. The expansion tube bending and expansion test device according to claim 7, characterized in that: The inner wall of the clamping upper cover and the inner wall of the clamping lower cover are respectively provided with cushion blocks which can be detachably mounted thereon.

9. The expansion tube bending expansion test device according to claim 7, characterized in that: The mounting block is rotatably connected to the support column via a bearing.

10. The expansion tube bending and expansion test device according to claim 1, characterized in that: The support frames are hydraulic support frames, and each of the hydraulic support frames pushes the expansion tube upwards so that the expansion tube forms a preset curvature as a whole.

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