Cavity-making tubular column length adjusting method, suspension device, lifting device and lifting system

Abstract

The invention relates to the technical field of salt cavern gas storage cavity construction, and discloses a cavity construction tubular column length adjusting method, a suspension device, a lifting device and a lifting system. The length adjusting method comprises the following steps that a plurality of hanging assemblies are used for fixing a first section of cavity-building inner pipe column, a first section of cavity-building outer pipe column, a non-first section of cavity-building outer pipe column and a non-first section of cavity-building inner pipe column; opening the corresponding suspension assembly, and removing the first section of cavity construction outer tubular column; or the additional assembly of the cavity-building outer tubular column is connected with the first section of cavity-building outer tubular column. Due to the fact that the first-section cavity-building inner pipe column, the first-section cavity-building outer pipe column, the non-first-section cavity-building outer pipe column and the non-first-section cavity-building inner pipe column can be fixedly connected with the corresponding hanging assemblies, when the hanging assemblies corresponding to the first-section cavity-building inner pipe column and the first-section cavity-building outer pipe column are opened, the first-section cavity-building outer pipe column and the non-first-section cavity-building inner pipe column can be hung on the first-section cavity-building outer pipe column. And the cavity construction inner pipe column and the cavity construction outer pipe column can still be fixed in the shaft, so that the length of the cavity construction outer pipe column can be adjusted under the condition that the cavity construction inner pipe column does not need to be pulled out.

Description

Technical Field

[0001] The present invention relates to the field of salt cavern gas storage cavity technology, and in particular to a method for adjusting the length of a cavity-forming string. Furthermore, the method further relates to a cavity-forming string suspension device, a lifting device, and a lifting system. Background Art

[0002] Natural gas is a safe, efficient, high-quality, clean energy source, and its consumption in the energy mix is increasing. However, due to the main challenges of natural gas supply, such as uneven spatial distribution of natural gas resources, imbalanced supply and demand, large price fluctuations, and insufficient transportation capacity, promoting the development of natural gas storage capacity is particularly important. Existing gas storage methods mainly include gas tanks, underground gas storage, and liquefied natural gas storage. Underground gas storage typically involves drilling wells and injecting clean water into salt layers, dissolving a portion of the salt layer to form cavities, into which natural gas is injected for storage. Using salt cavern gas storage not only balances fluctuations in natural gas supply and demand caused by seasonality or consumption fluctuations, but also plays a vital role in energy peak regulation and ensuring energy security.

[0003] Salt cavern gas storage primarily transforms underground salt formations into shapes and sizes that meet design requirements by coordinating the lifting and lowering of outer and inner cavern pipes. Currently, workover rigs are typically used to raise and lower these pipes. However, the outer and inner cavern pipes are sheathed over the inner cavern pipes and require fixtures to be fixed to the wellhead. Therefore, the fixtures on the inner cavern pipes must be removed before the outer cavern pipes are raised. Therefore, the inner cavern pipes must be completely removed from the wellbore before the workover rig is used to raise and lower the outer cavern pipes. After the outer cavern pipe raising and lowering operations are complete, the inner cavern pipes must be lowered back into the wellbore. This results in a cumbersome process, high costs, and low efficiency. Furthermore, workover rigs occupy a large area, are complex to operate, and prolong the cycle time. Furthermore, frequent raising and lowering of the cavern pipe string can easily scratch the optical fiber used to test the interface, posing a high safety risk. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems of cumbersome lifting and lowering operations and low efficiency in the prior art of the cavity making tube string, and to provide a cavity making tube string length adjustment method, a suspension device, a lifting device and a lifting system. The cavity making tube string length adjustment method can achieve the lifting and lowering of the cavity making tube outside the cavity without removing the cavity making tube inside the cavity.

[0005] In order to achieve the above-mentioned object, the first aspect of the present invention provides a method for adjusting the length of a cavity-forming tubing string, wherein the cavity-forming tubing string comprises an inner cavity-forming tubing string and an outer cavity-forming tubing string sleeved outside the inner cavity-forming tubing string. The method for adjusting the length of the cavity-forming tubing string comprises the following steps:

[0006] S1, using the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension to respectively fix the intracavitary tubing string described in the first section, the extracavitary tubing string described in the first section, the extracavitary tubing string not described in the first section and the intracavitary tubing string not described in the first section;

[0007] S2, opening the first-level suspension and the second-level suspension, and removing the first section of the extraluminal tubing string to reduce the length of the extraluminal tubing string;

[0008] or,

[0009] S1', using the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension to respectively fix the intracavitary tubing string described in the first section, the extracavitary tubing string described in the first section, the extracavitary tubing string not described in the first section and the intracavitary tubing string not described in the first section;

[0010] S2', opening the first-level suspension, and connecting the extraluminal tubing string additional component to the extraluminal tubing string described in the first section;

[0011] S3', connect the first section of the intraluminal tubing string to the first level suspension, open the fourth level suspension, and connect the first section of the extraluminal tubing string to the extraluminal tubing string other than the first section to increase the length of the extraluminal tubing string.

[0012] The method for adjusting the length of the cavity tubing provided by the present invention is connected to the first section cavity tubing, the first section cavity tubing, the cavity tubing outside the first section, the cavity tubing outside the first section, and the cavity tubing inside the first section respectively through the first-level suspension, the second-level suspension, the third-level suspension, and the fourth-level suspension. When it is necessary to reduce the length of the cavity tubing outside the first section, the third-level suspension and the fourth-level suspension are kept in a connected state with the cavity tubing outside the first section and the cavity tubing inside the first section. Therefore, the cavity tubing inside the cavity and the cavity tubing outside the first section can be kept fixed in the wellbore. At this time, the first-level suspension is opened, the cavity tubing outside the first section is taken out, and the second-level suspension is opened to remove the cavity tubing outside the first section. In this way, the cavity tubing outside the cavity can be continuously removed until the length of the cavity tubing outside the wellbore reaches a predetermined length. While removing the cavity tubing outside the cavity, the cavity tubing inside the wellbore is always kept in the wellbore, and there is no need to lift all the cavity tubing outside the wellbore. After the length adjustment of the cavity tubing outside the cavity is completed, the cavity tubing inside the wellbore is lowered into the wellbore. Similarly, when it is necessary to increase the length of the extracavity tubing string, keep the third-level suspension and the fourth-level suspension connected to the extracavity tubing string of the non-first section and the intracavity tubing string of the non-first section, open the first-level suspension, assemble the extracavity tubing string additional component (i.e., a new section of the extracavity tubing string) with the first section of the extracavity tubing string, and then connect the first-level suspension to the intracavity tubing string of the first section, open the fourth-level suspension, and connect the assembled extracavity tubing string to the extracavity tubing string of the non-first section in the wellbore. In this way, the extracavity tubing string additional component can be continuously added until the length of the extracavity tubing string in the wellbore reaches the predetermined length. Therefore, through the above technical solution, when the extracavity tubing string is raised and lowered to adjust the length of the extracavity tubing string, it is not necessary to lift the intracavity tubing string out of the wellbore completely, thereby simplifying the cavity operation process, improving the efficiency of the cavity operation and reducing the cavity construction cost; moreover, the cavity tubing string does not need to be raised and lowered more frequently, which also reduces the risk of scratching the optical fiber used for testing the interface on the cavity tubing string.

[0013] Optionally, step S1 or step S1' includes the following sub-steps:

[0014] S11, using the first-level suspension to fix the first section of the intracavitary tubing string;

[0015] S12, using the secondary suspension to fix the first section of the extraluminal tubular column;

[0016] S13, lifting the extraluminal tubing string described in Section 1, and using a three-stage suspension to fix the extraluminal tubing string not described in Section 1;

[0017] S14, separating the extracavitary tubing string described in the first section and the extracavitary tubing string not described in the first section, and fixing the intracavitary tubing string not described in the first section by using a four-stage suspension.

[0018] Optionally, the method for adjusting the length of the cavitation tubing string provided by the present invention further includes the following steps:

[0019] S4, using the first-level suspension to fix the first section of the intracavitary tubing string;

[0020] S5, lifting the intracavitary tubing string described in the first section, and using the secondary suspension to fix the intracavitary tubing string not described in the first section;

[0021] S6, removing the intracavitary tubing string in the first section to reduce the length of the intracavitary tubing string;

[0022] or,

[0023] S4', using the first-level suspension to fix the first section of the intracavitary tubing string;

[0024] S5', connecting the endoluminal tubing string additional assembly to the endoluminal tubing string described in the first section to increase the length of the endoluminal tubing string.

[0025] A second aspect of the present invention provides a suspension device for a cavitation tube string, which is suitable for the above-mentioned method for adjusting the length of the cavitation tube string. The suspension device comprises: a support frame; a multi-stage suspension module, wherein the multi-stage suspension module is mounted on the support frame, and the multi-stage suspension module comprises a suspension assembly for fixing and axially moving the cavitation tube string, wherein the suspension assembly comprises the first-stage suspension, the second-stage suspension, the third-stage suspension, and the fourth-stage suspension; and

[0026] A first driving module is used to drive the suspension assembly to move axially along the cavity creation string.

[0027] Optionally, the suspension assembly comprises a fixing unit for connecting to the cavitation tube string and a lifting unit connected to the fixing unit and capable of moving axially along the cavitation tube string, and the lifting unit is transmission-connected to the output end of the first driving module.

[0028] Optionally, the fixing unit includes a plurality of claws, and the plurality of claws can be sleeved on the outer wall of the cavity-forming tube column, and the plurality of claws are combined to form a closed space.

[0029] Optionally, the first drive module is installed on the top of the support frame, and the cavity tube suspension device also includes a load-bearing module that is transmission-connected to the lifting unit through the first drive module, and the load-bearing module is configured to be able to move synchronously in the opposite direction relative to the lifting unit.

[0030] The third aspect of the present invention provides a cavity tube column lifting device, including the above-mentioned cavity tube column suspension device, the cavity tube column includes a cavity tube and a cavity tube transmission short section arranged on the upper part of the cavity tube, and the cavity tube column includes an outer cavity tube and a cavity tube transmission short section arranged on the upper part of the outer cavity tube; the cavity tube column lifting device also includes: a transmission rack, the transmission rack is installed on the outer wall of the cavity tube transmission short section and the outer cavity tube transmission short section; a lifting gear, the lifting gear can be engaged with the transmission rack; and a second drive module, the second drive module is connected to the lifting gear to drive the lifting gear to rotate and drive the cavity tube column axially to move; wherein, the suspension assembly can be connected to the cavity tube transmission short section and / or the cavity tube transmission short section.

[0031] Optionally, the second drive module includes a sliding support seat for mounting the lifting gear and a drive assembly connected to the lifting gear, the sliding support seat is configured to be able to move radially along the cavitation tube column, and the drive assembly is used to drive the lifting gear to rotate.

[0032] Optionally, the sliding support seat includes a seat body for installing the lifting gear, a slide groove slidingly matched with the seat body, a ball screw installed in the slide groove and connected to the seat body, and a third drive module connected to the ball screw, and the third drive module is used to drive the ball screw to rotate to drive the seat body to move radially along the cavity tube column.

[0033] Optionally, the drive assembly includes a transmission gear connected to the lifting gear, a drive unit, and a transmission chain respectively connected to the transmission gear and the output end of the drive unit. The drive unit is configured to drive the transmission gear to rotate through the transmission chain to drive the lifting gear to rotate.

[0034] Optionally, the drive unit includes a motor and a gearbox drivingly connected to the motor, and the gearbox is drivingly connected to the transmission chain.

[0035] Optionally, the intracavitary tube transmission short section and / or the extracavitary tube transmission short section respectively include a tube body, a rack mounting unit arranged at both ends of the tube body and used to install the transmission rack, and a first connector and a second connector formed at the end of the tube body, and the first connector can be connected to the second connector.

[0036] Optionally, the transmission rack includes a tooth unit for engaging with the lifting gear and an annular mounting piece arranged at both ends of the tooth unit; the rack mounting unit includes an annular groove connecting clamp sleeved on both ends of the tube body, and the outer wall of the annular groove connecting clamp is formed with an installation annular groove for installing the annular mounting piece.

[0037] Optionally, the transmission rack further includes a first rack connecting ear and a second rack connecting ear respectively protruding from both ends of the tooth unit, and the first rack connecting ear and the second rack connecting ear can be connected by connecting bolts.

[0038] The fourth aspect of the present invention provides a cavity tubing string lifting system, which comprises the above-mentioned cavity tubing string lifting device and a wellhead module equipped with the support frame, wherein the cavity tubing inner transmission subsection and the cavity tubing outer transmission subsection can be fixed to the wellhead module.

[0039] Optionally, the cavity pipe column lifting system provided by the present invention further comprises a sealing module sealedly connected between the cavity outer pipe transmission nipple and the cavity outer pipe to prevent leakage of the dissolution inhibitor in the salt cavern gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the lumen creation column lifting system disclosed in the present invention;

[0041] Figure 2 yes Figure 1 Schematic diagram of a top-down perspective;

[0042] Figure 3 This is a schematic structural diagram of the intracavitary tube transmission sub disclosed in the present invention;

[0043] Figure 4 It is a structural schematic diagram of the transmission rack of the intracavitary tube disclosed in the present invention;

[0044] Figure 5 It is a structural schematic diagram of the intracavitary tube transmission short section disclosed in the present invention in a connected state.

[0045] Description of Reference Numerals

[0046] 1- Transmission subsection of the inner tube of the cavity; 101- Ring groove connecting clamp; 102- Transmission rack; 103- Mounting ring groove; 104- First rack connecting ear; 105- Tooth unit; 106- Tube body; 107- Connecting bolt; 108- First connector; 109- Ring mounting piece; 110- Second rack connecting ear; 2- Transmission subsection of the outer tube of the cavity; 3- Wellhead module; 4- Formation; 5- Inner tube of the cavity; 6- Sliding support seat; 601- Seat body; 602- Slide groove; 603- Ball screw; 7- Lifting gear; 701- Transmission gear; 8- Transmission chain; 9- Motor; 10- Gearbox; 11- Annulus sealing assembly; 12- Seal subsection; 13- Outer tube of the cavity; 14- Suspension device; 1401- Support frame; 1402- Suspension assembly; 1403- Claw. DETAILED DESCRIPTION

[0047] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0048] In the present invention, unless otherwise specified, the directions or positional relationships indicated by terms such as "up, down, left, right, inside, outside, top, bottom" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0049] Furthermore, the terms "first," "second," "primary," "secondary," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "primary," or "secondary" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present invention, descriptions with reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0051] In addition, the terms "S1", "S2", etc. are used for descriptive purposes only and do not indicate a specific order of steps in the method. "S1" is not necessarily the first step, "S2" may also be implemented before "S1", and other steps may be included between "S1" and "S2". Therefore, they should not be understood as limitations on the present invention.

[0052] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] The following describes in detail the lumen column length adjustment method, suspension device, lifting device and lifting system provided by the present invention with reference to the accompanying drawings.

[0054] In the process of building a cavity in a salt cavern gas storage reservoir, it is necessary to use a cavity building string to inject clean water and discharge brine. By continuously lifting and lowering the cavity building string, the shape of the salt cavern gas storage reservoir can be adjusted to the designed shape. The cavity building string includes an inner cavity building string and an outer cavity building string sleeved outside the inner cavity building string. The tops of the inner cavity building string and the outer cavity building string generally need to be connected with corresponding fixing components to be fixed at the wellhead. Since the outer cavity building string is sleeved outside the inner cavity building string, when it is necessary to lift and lower the outer cavity building string, it is necessary to remove the fixing component corresponding to the inner cavity building string. Therefore, when the outer tubing string is raised or lowered in the prior art, it is usually necessary to remove all the inner tubing strings in the wellbore, and when the length of the outer tubing string is adjusted to a first predetermined length, the outer tubing string is fixed and then the inner tubing string is reinserted. This makes the operation steps of the cavity making process complicated, the cavity making cost is high, and the cavity making efficiency is low. At the same time, frequent raising and lowering of the cavity making string can easily scratch the optical fiber used for testing the interface on the cavity making string, and the operation safety risk is relatively high.

[0055] In order to solve at least one of the above-mentioned technical problems in the prior art, the first aspect of the present invention provides a method for adjusting the length of a lumen-forming tubing string. The method for adjusting the length of a lumen-forming tubing string comprises the following steps, but not necessarily in the following order:

[0056] S1, using the first-stage suspension, the second-stage suspension, the third-stage suspension and the fourth-stage suspension to fix the first-section intracavitary tubing string, the first-section extracavitary tubing string, the non-first-section extracavitary tubing string and the non-first-section intracavitary tubing string respectively;

[0057] S2, open the first and second suspensions, remove the first section of the extraluminal tubing string; or

[0058] S1', using the first-stage suspension, the second-stage suspension, the third-stage suspension and the fourth-stage suspension to fix the first segmented intraluminal tubing string, the first segmented extraluminal tubing string, the non-first segmented extraluminal tubing string and the non-first segmented intraluminal tubing string respectively;

[0059] S2', open the first-level suspension and connect the extraluminal tubing string attachment assembly to the first section of the extraluminal tubing string;

[0060] S3', connect the first sectioned intraluminal tubing string to the first-stage suspension, open the fourth-stage suspension, and connect the first sectioned extraluminal tubing string to the non-first sectioned extraluminal tubing string to increase the length of the extraluminal tubing string;

[0061] The length of the extraluminal tubing string can be reduced by repeating steps S1 to S2 until the extraluminal tubing string reaches a predetermined length, or the length of the extraluminal tubing string can be increased by repeating steps S1' to S3' until the extraluminal tubing string reaches a predetermined length.

[0062] It should be noted that in the present invention, the extracavitary tubing string includes the following multi-section extracavitary tubing 13 and / or extracavitary tubing transmission short section 2, and the first section of the extracavitary tubing string refers to the extracavitary tubing 13 or extracavitary tubing transmission short section 2 corresponding to the top position along the wellbore from top to bottom. Similarly, the intracavitary tubing string includes the following multi-section intracavitary tubing 5 and / or intracavitary tubing transmission short section 1, and the first section of the extracavitary tubing string refers to the intracavitary tubing 5 or intracavitary tubing transmission short section 1 corresponding to the top position along the wellbore from top to bottom.

[0063] In addition, the non-first sectioning extracavitary tubular column refers to any sectioning extracavitary tubular column other than the aforementioned first sectioning extracavitary tubular column, for example, it can be the second sectioning extracavitary tubular column, the third sectioning extracavitary tubular column, etc. According to one embodiment of the present invention, the three-stage suspension can be fixedly connected to the second sectioning extracavitary tubular column, so that the lifting distance of the extracavitary tubular column can be reduced; similarly, the non-first sectioning intracavitary tubular column refers to any sectioning intracavitary tubular column other than the aforementioned first sectioning intracavitary tubular column, for example, it can be the second sectioning intracavitary tubular column, the third sectioning intracavitary tubular column, etc. According to one embodiment of the present invention, the four-stage suspension can be fixedly connected to the second sectioning intracavitary tubular column, so that the lifting distance of the intracavitary tubular column can be reduced.

[0064] It should also be noted that the additional component of the extracavitary tubing string refers to the extracavitary tubing 13 or the extracavitary tubing transmission short section 2. The additional component of the extracavitary tubing string is connected to the first section of the extracavitary tubing string, thereby increasing the length of the extracavitary tubing string. In the assembled extracavitary tubing string, the original additional component of the extracavitary tubing string becomes the new first section of the extracavitary tubing string, and the original first section of the extracavitary tubing string becomes the second section of the extracavitary tubing string, and so on. Similarly, the additional component of the intracavitary tubing string refers to the intracavitary tubing 5 or the intracavitary tubing transmission short section 1. The additional component of the intracavitary tubing string is connected to the first section of the intracavitary tubing string, thereby increasing the length of the intracavitary tubing string. In the assembled intracavitary tubing string, the original additional component of the intracavitary tubing string becomes the new first section of the intracavitary tubing string, and the original first section of the intracavitary tubing string becomes the second section of the intracavitary tubing string, and so on.

[0065] According to the method for adjusting the length of the cavity tubing provided by the present invention, when adjusting the length of the outer cavity tubing, the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension are respectively connected to the first-section inner cavity tubing, the first-section outer cavity tubing, the outer cavity tubing described in the non-first section and the inner cavity tubing described in the non-first section. When it is necessary to reduce the length of the outer cavity tubing, the third-level suspension and the fourth-level suspension are kept connected to the outer cavity tubing described in the non-first section and the inner cavity tubing described in the non-first section. Therefore, the inner cavity tubing and the outer cavity tubing can be kept fixed in the wellbore. At this time, the first-level suspension is opened, the first-section outer cavity tubing is taken out, and the second-level suspension is opened to remove the first-section outer cavity tubing. In this way, the outer cavity tubing can be continuously removed until the length of the outer cavity tubing in the wellbore reaches the first predetermined length. While removing the outer cavity tubing, the inner cavity tubing always remains in the wellbore, and there is no need to completely remove the inner cavity tubing from the wellbore. After the length adjustment of the outer cavity tubing is completed, the inner cavity tubing can be lowered into the wellbore. Similarly, when it is necessary to increase the length of the extracavitary tubing string, keep the third-level suspension and the fourth-level suspension connected to the non-first-section extracavitary tubing string and the non-first-section intracavitary tubing string, open the first-level suspension, assemble the extracavitary tubing string additional components (i.e., a new section of the extracavitary tubing string) with the first section of the extracavitary tubing string, and then connect the first-level suspension to the first section of the intracavitary tubing string, open the fourth-level suspension, and connect the assembled extracavitary tubing string to the non-first section extracavitary tubing string in the wellbore. In this way, the extracavitary tubing string additional components can be continuously added until the length of the extracavitary tubing string in the wellbore reaches the first predetermined length.

[0066] Therefore, through the above technical solution, when raising and lowering the outer cavity-making tubing string to adjust the length of the outer cavity-making tubing string, it is not necessary to lift the entire inner cavity-making tubing string out of the wellbore, thereby simplifying the cavity-making operation process, improving the cavity-making operation efficiency and reducing the cavity-making construction cost; moreover, the cavity-making tubing string does not need to be raised and lowered more frequently, which also reduces the risk of scratching the optical fiber used for testing the interface on the cavity-making tubing string.

[0067] Optionally, the aforementioned step S1 or S1' includes the following specific sub-steps, but not necessarily in the following order:

[0068] S11, using the first-stage suspension to fix the tubular string in the first section cavity. If the tubular string in the first section cavity is fixed to the wellhead module 3 described below, the fixation is canceled and the tubular string in the first section cavity is fixed to the first-stage suspension.

[0069] S12, using the secondary suspension to fix the first sectioned extracavity tubing string. If the first sectioned extracavity tubing string is fixed to the wellhead module 3, the fixation is canceled and the first sectioned extracavity tubing string is fixed to the secondary suspension.

[0070] S13, lifting the first section extraluminal tubing string, using a three-stage suspension to fix the non-first section extraluminal tubing string, the first section extraluminal tubing string can be lifted by the following suspension device or lifting device, driving the extraluminal tubing string to rise, and the non-first section extraluminal tubing string can be selected as the second section extraluminal tubing string, so as to reduce the lifting distance of the first section extraluminal tubing string, and the three-stage suspension is fixedly connected to the second section extraluminal tubing string;

[0071] S14, split the first-section extracavity tubing string and the non-first-section extracavity tubing string. The first-section extracavity tubing string can be further pulled up to expose the intracavity tubing string located inside the extracavity tubing string. At this time, a four-stage suspension is used to fix the connection with the non-first-section intracavity tubing string. The non-first-section intracavity tubing string corresponds to the second-section intracavity tubing string.

[0072] Through the above steps, the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension are respectively connected to the first section of the intracavitary tubing, the first section of the extracavitary tubing, the second section of the extracavitary tubing and the second section of the intracavitary tubing, so that the first section of the extracavitary tubing can be removed or additional components of the extracavitary tubing can be added without removing the intracavitary tubing.

[0073] The method for adjusting the length of the lumen-forming tubing string provided by the present invention further includes the following steps, but not necessarily in the following order:

[0074] S4, using the first-stage suspension to fix the tubular string in the first section cavity. If the tubular string in the first section cavity is fixed to the wellhead module 3, the fixation is canceled and the tubular string in the first section cavity is fixed to the first-stage suspension.

[0075] S5, lifting the first sectioned cavity tubing string, which can be lifted by the following suspension device or lifting device, driving the cavity tubing string upward, and using a secondary suspension to fix the non-first sectioned cavity tubing string, which can be the second sectioned cavity tubing string, so as to reduce the lifting distance of the cavity tubing string;

[0076] S6, opening the first stage suspension to remove the first section of the intracavitary tubing string to reduce the length of the intracavitary tubing string; or,

[0077] S4', using the first-stage suspension to fix the tubular string in the first section cavity. If the tubular string in the first section cavity is fixed to the wellhead module 3, the fixation is canceled and the tubular string in the first section cavity is fixed to the first-stage suspension.

[0078] S5', connecting the endoluminal tubing string additional component to the first section of the endoluminal tubing string to increase the length of the endoluminal tubing string;

[0079] By repeating steps S4 to S6 , the length of the intracavitary tubing string can be reduced until the intracavitary tubing string reaches a predetermined length. Alternatively, by repeating steps S4 ′ to S5 ′ , the length of the intracavitary tubing string can be increased until the intracavitary tubing string reaches a predetermined length.

[0080] The second aspect of the present invention provides a luminal tubing string suspension device, which is suitable for the above-mentioned luminal tubing string length adjustment method, referring to Figure 1 and Figure 2 As shown, the suspension device includes: a support frame 1401; a multi-stage suspension module, the multi-stage suspension module is installed on the support frame 1401, the multi-stage suspension module includes a suspension component 1402 for fixing and axially moving the cavitation tube column, the suspension component 1402 may include a first-stage suspension, a second-stage suspension, a third-stage suspension, and a fourth-stage suspension, etc.; and a first driving module for driving the suspension component to move axially along the cavitation tube column.

[0081] Optionally, the first-stage suspension, the second-stage suspension, the third-stage suspension, and the fourth-stage suspension all have a fixing unit for connecting to the cavitation tube column and a lifting unit connected to the fixing unit and movable axially along the cavitation tube column; and a first driving module, the first driving module is used to drive the lifting unit to move axially along the cavitation tube column, so that the first driving module drives the lifting unit to drive the fixing unit and the cavitation tube column to move axially, thereby realizing the lifting and lowering of the cavitation tube column.

[0082] The fixing unit can be any structure as long as it can fix the cavitation column. For example, the fixing unit can be a clamp with a bolt, which is sleeved on the outer wall of the cavitation column and fixed to the cavitation column by tightening the bolt. Or according to an embodiment of the cavitation column suspension device of the present invention, combined with Figure 2 As shown, the fixing unit includes multiple claws 1403, which can be sleeved on the outer wall of the endotracheal tube string and enclose a closed space. The multiple claws 1403 cooperate to enclose and secure the endotracheal tube string. Optionally, there are three claws 1403, each of which covers at least 1 / 3 of the arc surface of the outer wall of the endotracheal tube string, so that the three claws 1403 can enclose and secure the endotracheal tube string. Of course, the number of claws 1403 can also be two, four, or more, depending on the actual situation.

[0083] Optionally, a first drive module is mounted on top of the support frame 1401. The first drive module can be an electric motor, an electric motor, or the like, as long as it can provide driving force for the axial movement of the lifting unit. The cavitation column suspension device 14 also includes a load-bearing module that is connected to the lifting unit through the first drive module. The load-bearing module is configured to move synchronously in the opposite direction relative to the lifting unit. According to one embodiment of the present invention, the output end of the first drive module is connected to a pulley assembly, and the lifting unit and the load-bearing module are connected through the pulley assembly via a steel cable. The lifting unit and the load-bearing module are respectively located on both sides of the pulley assembly. When the first drive module drives the lifting unit to rise, the load-bearing module descends accordingly; when the first drive module drives the lifting unit to descend, the load-bearing module rises accordingly. This improves the stability of the lifting unit when it rises or falls.

[0084] The third aspect of the present invention provides a lumen column lifting device, referring to Figures 1 to 5 As shown, it includes the above-mentioned cavitation column suspension device 14, wherein the cavitation column includes the cavitation column 5 and the cavitation column transmission short section 1 arranged on the upper part of the cavitation column 5, and the cavitation column includes the cavitation column 13 and the cavitation column transmission short section 2 arranged on the upper part of the cavitation column 13. Figure 1 、 Figure 4 as well as Figure 5 As shown, the endoluminal tubing string lifting device further includes: a transmission rack 102 mounted on the outer walls of the endoluminal tubing transmission subsection 1 and the extraluminal tubing transmission subsection 2; a lifting gear 7 that can mesh with the transmission rack 102; and a second drive module that is transmission-connected to the lifting gear 7 to drive the lifting gear 7 to rotate and drive the endoluminal tubing string to move axially; wherein the suspension assembly 1402 can be connected to the endoluminal tubing transmission subsection 1 and / or the extraluminal tubing transmission subsection 2 to secure the endoluminal tubing string and / or the extraluminal tubing string. When the lifting gear 7 meshes with the transmission rack 102 corresponding to the extraluminal tubing transmission subsection 2 or the endoluminal tubing transmission subsection 1, the lifting gear 7 is driven to rotate by the second drive module, thereby driving the extraluminal tubing transmission subsection 2 or the endoluminal tubing transmission subsection 1 to be raised or lowered.

[0085] Optionally, refer to Figure 1 and Figure 2As shown, the second drive module includes a sliding support seat 6 for mounting a lifting gear 7 and a drive assembly connected to the lifting gear 7. The sliding support seat 6 is configured to be movable radially along the cavitation tubing string, and the drive assembly is used to drive the lifting gear 7 to rotate. When it is necessary to lift the extracavitation tubing string (or the intracavitation tubing string), the extracavitation tubing transmission pup section 2 (or the intracavitation tubing string transmission pup section 1) is fixed to a position corresponding to the lifting gear 7 by the suspension assembly 1402. By radially moving the sliding support seat 6 toward the cavitation tubing string transmission pup section 2 (or the intracavitation tubing string transmission pup section 1), and engaging the lifting gear 7 with the transmission rack 102 on the outer wall of the extracavitation tubing transmission pup section 2 (or the intracavitation tubing string transmission pup section 1), the drive assembly is used to drive the lifting gear 7 to rotate, thereby driving the extracavitation tubing transmission pup section 2 (or the intracavitation tubing string transmission pup section 1) to be lifted or lowered.

[0086] Optionally, refer to Figure 2 As shown, the sliding support base 6 includes a base body 601 for mounting the lifting gear 7, a slide groove 602 slidably engaged with the base body 601, a ball screw 603 installed in the slide groove 602 and transmission-connected to the base body 601, and a third drive module transmission-connected to the ball screw 603. The third drive module can be an electric motor, a motor, or manually driven, as long as it can provide driving force for the rotation of the ball screw 603. The third drive module drives the ball screw 603 to rotate, thereby driving the base body 601 to move radially along the endoscopic string.

[0087] Optionally, the vertical cross-section of the chute 602 is T-shaped to facilitate positioning of the seat body 601. A plurality of bolt holes are provided in the chute, and the chute 602 is fixed to the top of the wellhead module 3 described below by flange bolts.

[0088] Optionally, refer to Figure 1 and Figure 2 As shown, the driving assembly includes a transmission gear 701 that is transmission-connected to the lifting gear 7, a driving unit, and a transmission chain 8 that is transmission-connected to the transmission gear 701 and the output end of the driving unit respectively. The driving unit is configured to drive the transmission gear 701 to rotate through the transmission chain 8, that is, the transmission chain 8 is sleeved on the output end of the driving unit and the transmission gear 701 to drive the lifting gear 7 to rotate through the driving unit.

[0089] Optionally, the drive unit may be an electric motor, a motor, etc., or according to one embodiment of the present invention, the drive unit includes a motor 9 and a gearbox 10 connected to the motor 9, and the gearbox 10 is connected to the transmission chain 8. The gearbox 10 can provide a larger load output to ensure that the raising and lowering of the cavitation tubing string can be carried out smoothly.

[0090] According to the lifting device provided by the present invention, by adjusting the power output of the motor 9, the rotation speed of the transmission gear 701 is regulated in real time to adjust the transmission torque. The motor 9, the gearbox 10, the transmission chain 8, the transmission gear 701, the lifting gear 7 and the transmission rack 102 are closely matched. Compared with the transmission workover rig, it has the advantages of compact structure, small footprint and providing large load output.

[0091] Optionally, refer to Figures 3 to 5 The intracavitary tube transmission sub 1 and / or the extracavitary tube transmission sub 2 each include a tubular body 106, rack mounting units disposed at both ends of the tubular body 106 for mounting the transmission rack 102, and a first connector 108 and a second connector formed at the ends of the tubular body 106. The first connector 108 can be mated with the second connector. There are various ways to connect the first connector 108 and the second connector, such as by threaded connection.

[0092] The transmission rack 102 can be connected to the outer wall of the intracavitary tube transmission short section 1 and / or the extracavitary tube transmission short section 2 by welding, or the transmission rack 102 can be installed on the outer wall of the intracavitary tube transmission short section 1 and / or the extracavitary tube transmission short section 2 by two clamps.

[0093] Alternatively, according to one embodiment of the lifting device of the present invention, referring to Figure 4 and 5 As shown, the transmission rack 102 includes a tooth unit 105 for meshing with the lifting gear 7 and an annular mounting member 109 disposed at each end of the tooth unit 105. The rack mounting unit comprises an annular groove connecting clamp 101 that is sleeved on each end of the tube body 106. The outer wall of the annular groove connecting clamp 101 is formed with an annular mounting groove 103 for receiving the annular mounting member 109. The mounting groove 103 cooperates with the annular mounting member 109 to mount the transmission rack 102 on the outer wall of the intraluminal tube transmission sub 1 and / or the extraluminal tube transmission sub 2. In this way, the annular mounting member 109 can rotate within the mounting groove 103, allowing the tooth unit 105 to engage with the lifting gear 7.

[0094] Furthermore, a plurality of transmission racks 102 are mounted on the outer wall of each intracavitary tube transmission short section 1 and / or extracavitary tube transmission short section 2. Correspondingly, the number of the lifting gears 7 and the second driving module is multiple and the number is the same as the number of the transmission racks 102. According to an embodiment of the lifting device of the present invention, referring to Figure 2As shown, there are three transmission racks 102, along with corresponding sliding supports 6 and lifting gears 7. The annular mounting member 109 has a 120° arc, meaning the annular mounting members 109 of the three transmission racks 102 can be combined to form a closed space. Providing three sets of transmission racks 102, sliding supports 6, and lifting gears 7 not only improves the stability of the engagement between the lifting gears 7 and the transmission racks 102 but also aids in centering the cavitation string, keeping it centered in the wellbore and preventing it from rubbing against the wellbore's inner wall, which could damage it.

[0095] Optionally, refer to Figure 4 and Figure 5 As shown, the transmission rack 102 also includes a first rack connecting ear 104 and a second rack connecting ear 110 respectively protruding from both ends of the tooth unit 105. The first rack connecting ear 104 and the second rack connecting ear 110 can be connected by a connecting bolt 107 to facilitate fixing the transmission rack 102 to the outer wall of the intracavitary tube transmission short section 1 and / or the extracavitary tube transmission short section 2.

[0096] The fourth aspect of the present invention provides a lumen column lifting system, referring to Figure 1 As shown, the above-mentioned cavity pipe string lifting device and the wellhead module 3 installed with the support frame 1401 are included, and the cavity pipe transmission short section 1 and the cavity pipe transmission short section 2 can be fixed to the wellhead module 3. In addition, as Figure 1 As shown, the sliding support seat 6 can be installed on the top of the wellhead module 3. The wellhead module 3 is installed on the surface of the formation 4. The wellhead module 3 has an internal opening, forming a part of the wellbore. The inner cavity pipe transmission sub 1 and the outer cavity pipe transmission sub 2 are installed in the wellbore, and the top part can be fixed to the top of the wellhead module 3. In addition, the height of the support frame 1401 is set to exceed the maximum height of the cavity pipe string raised by the suspension device 14 or the lifting device, so as to facilitate the lifting and removal of the cavity pipe string.

[0097] At present, in the process of building salt cavern gas storage, the dissolution agent mainly adopts liquid medium such as diesel or gaseous medium such as nitrogen. The use of diesel as the dissolution agent is convenient for controlling the shape of the cavity, and it is safe and controllable. However, a large amount of diesel is often lost in the process of cavity making, polluting the environment around the well. Once it leaks to the salt chemical enterprise, it will cause it to stop production. The use of nitrogen as the dissolution agent can overcome the shortcomings of diesel dissolution agent. It is environmentally friendly, and the gas-liquid interface monitoring is relatively easy. The interface adjustment is simple. It can also speed up the construction of the reservoir to a certain extent. However, when raising and lowering the cavity making pipe string, the nitrogen needs to be vented in advance, resulting in a waste of gas resources. For this reason, the lifting and attention system provided by the present invention also includes a sealing module that is sealed between the cavity making outer pipe transmission short section 2 and the cavity making outer pipe 13 to prevent the dissolution agent in the salt cavern gas storage from leaking.

[0098] Optionally, refer to Figure 1As shown, the sealing module includes a sealing subsection 12 disposed between the outer cavity tube transmission subsection 2 and the outer cavity tube 13, and an annular space sealing assembly 11 disposed in the annular space between the inner wall of the wellbore and the outer wall of the sealing subsection. The annular space sealing assembly 11 can seal the above-mentioned annular space to prevent the gas in the salt cavern gas storage from escaping from the annular space. The sealing subsection 12 is closed when the cavity tube string is raised and lowered to seal the outer cavity tube 13 to prevent the gas from escaping from the outer cavity tube 13. During the cavitation process of the salt cavern gas storage, a certain liquid level is maintained in the inner cavity tube 5, thereby forming a liquid seal to prevent the gas from escaping from the inner cavity tube 5. Therefore, the sealing module can effectively prevent the gas in the salt cavern gas storage from escaping, without the need to vent the gas in advance, which not only saves resources, but also simplifies the operation process and shortens the cavitation operation cycle.

[0099] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention may be subjected to various simple modifications, including combining the specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for adjusting the length of a lumen-forming tubing string, characterized in that: The cavity-making tubing string comprises an inner cavity-making tubing string and an outer cavity-making tubing string sleeved outside the inner cavity-making tubing string. The method for adjusting the length of the cavity-making tubing string comprises the following steps: S1, using the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension to respectively fix the intracavitary tubing string described in the first section, the extracavitary tubing string described in the first section, the extracavitary tubing string not described in the first section and the intracavitary tubing string not described in the first section; S2, opening the first-level suspension and the second-level suspension, and removing the first section of the extraluminal tubing string to reduce the length of the extraluminal tubing string; or, S1', using the first-level suspension, the second-level suspension, the third-level suspension and the fourth-level suspension to respectively fix the intracavitary tubing string described in the first section, the extracavitary tubing string described in the first section, the extracavitary tubing string not described in the first section and the intracavitary tubing string not described in the first section; S2', opening the first-level suspension, and connecting the extraluminal tubing string additional component to the extraluminal tubing string described in the first section; S3', connect the first section of the intraluminal tubing string to the first level suspension, open the fourth level suspension, and connect the first section of the extraluminal tubing string to the extraluminal tubing string other than the first section to increase the length of the extraluminal tubing string.

2. The method for adjusting the length of the lumen-forming tubing string according to claim 1, wherein: Step S1 or step S1' includes the following sub-steps: S11, using the first-level suspension to fix the first section of the intracavitary tubing string; S12, using the secondary suspension to fix the first section of the extraluminal tubular column; S13, lifting the extraluminal tubing string described in Section 1, and using a three-stage suspension to fix the extraluminal tubing string not described in Section 1; S14, separating the extracavitary tubing string described in the first section and the extracavitary tubing string not described in the first section, and fixing the intracavitary tubing string not described in the first section by using a four-stage suspension.

3. The method for adjusting the length of the lumen-forming tubing string according to claim 1, wherein: The following steps are also included: S4, using the first-level suspension to fix the first section of the intracavitary tubing string; S5, lifting the intracavitary tubing string described in the first section, and using the secondary suspension to fix the intracavitary tubing string not described in the first section; S6, removing the intracavitary tubing string in the first section to reduce the length of the intracavitary tubing string; or, S4', using the first-level suspension to fix the first section of the intracavitary tubing string; S5', connecting the endoluminal tubing string additional assembly to the endoluminal tubing string described in the first section to increase the length of the endoluminal tubing string.

4. A luminal tube hanging device, characterized in that: Applicable to the method for adjusting the length of the cavitation tubing string according to any one of claims 1 to 3, the suspension device comprises: Support frame (1401); A multi-stage suspension module, the multi-stage suspension module is installed on the support frame (1401), the multi-stage suspension module includes a suspension assembly (1402) for fixing and axially moving the cavitation tube string, the suspension assembly (1402) includes the first-stage suspension, the second-stage suspension, the third-stage suspension and the fourth-stage suspension; and A first driving module is used to drive the suspension assembly (1402) to move axially along the cavitation tubing string.

5. The luminal tubing string suspension device according to claim 4, characterized in that: The suspension assembly (1402) comprises a fixing unit for connecting to the cavitation tube column and a lifting unit connected to the fixing unit and capable of moving axially along the cavitation tube column, and the lifting unit is transmission-connected to the output end of the first driving module.

6. The luminal tube string suspension device according to claim 5, characterized in that: The fixing unit includes a plurality of claws (1403), and the plurality of claws (1403) can be sleeved on the outer wall of the cavity-forming tube column, and the plurality of claws (1403) are combined to form a closed space.

7. The luminal tube string suspension device according to claim 5, characterized in that: The first driving module is installed on the top of the support frame (1401), and the cavity tube column suspension device (14) also includes a load-bearing module that is connected to the lifting unit through the first driving module, and the load-bearing module is configured to be able to move synchronously in the opposite direction relative to the lifting unit.

8. A lumen column lifting device, characterized in that: The invention comprises a cavitation column suspension device (14) according to any one of claims 4 to 7, wherein the cavitation column comprises an cavitation column (5) and an cavitation column transmission short section (1) provided on the upper portion of the cavitation column (5); and the cavitation column comprises an cavitation column (13) and an cavitation column transmission short section (2) provided on the upper portion of the cavitation column (13). The lumen-making column lifting device further comprises: A transmission rack (102), the transmission rack (102) being mounted on the outer walls of the inner cavity tube transmission short section (1) and the outer cavity tube transmission short section (2); a lifting gear (7), the lifting gear (7) being capable of meshing with the transmission rack (102); and a second driving module, the second driving module being in transmission connection with the lifting gear (7) to drive the lifting gear (7) to rotate and drive the cavitation tube column to move axially; Wherein, the suspension assembly (1402) can be connected to the intracavitary tube transmission short section (1) and / or the extracavitary tube transmission short section (2).

9. The lumen-making column lifting device according to claim 8, characterized in that: The second driving module comprises a sliding support seat (6) for mounting the lifting gear (7) and a driving assembly in transmission connection with the lifting gear (7); the sliding support seat (6) is configured to be able to move radially along the cavitation tube column; and the driving assembly is used to drive the lifting gear (7) to rotate.

10. The lumen creation column lifting device according to claim 9, characterized in that: The sliding support seat (6) includes a seat body (601) for installing the lifting gear (7), a slide groove (602) slidingly matched with the seat body (601), a ball screw (603) installed in the slide groove (602) and transmission-connected to the seat body (601), and a third driving module transmission-connected to the ball screw (603), wherein the third driving module is used to drive the ball screw (603) to rotate so as to drive the seat body (601) to move radially along the cavity-making tube column.

11. The lumen-making column lifting device according to claim 9, characterized in that: The driving assembly comprises a transmission gear (701) in transmission connection with the lifting gear (7), a driving unit, and a transmission chain (8) in transmission connection with the transmission gear (701) and an output end of the driving unit, respectively. The driving unit is configured to drive the transmission gear (701) to rotate via the transmission chain (8), thereby driving the lifting gear (7) to rotate.

12. The lumen-making column lifting device according to claim 11, characterized in that: The drive unit comprises a motor (9) and a gearbox (10) transmission-connected to the motor (9), and the gearbox (10) transmission-connected to the transmission chain (8).

13. The lumen creation column lifting device according to claim 8, characterized in that: The intracavitary tube transmission short section (1) and / or the extracavitary tube transmission short section (2) respectively include a tube body (106), a rack mounting unit arranged at both ends of the tube body (106) and used to mount the transmission rack (102), and a first connector (108) and a second connector formed at the end of the tube body (106), wherein the first connector (108) can be connected to the second connector.

14. The lumen-making column lifting device according to claim 13, characterized in that: The transmission rack (102) comprises a tooth unit (105) for engaging with the lifting gear (7) and annular mounting members (109) provided at both ends of the tooth unit (105); The rack mounting unit comprises an annular groove connecting clamp (101) sleeved on both ends of the tube body (106), and an outer wall of the annular groove connecting clamp (101) is formed with an installation annular groove (103) for installing the annular mounting member (109).

15. The lumen-making column lifting device according to claim 14, characterized in that: The transmission rack (102) further comprises a first rack connecting ear (104) and a second rack connecting ear (110) respectively protruding from both ends of the tooth unit (105); the first rack connecting ear (104) and the second rack connecting ear (110) can be connected by a connecting bolt (107).

16. A lumen column lifting system, characterized in that: It comprises a cavity-making pipe column lifting device according to any one of claims 8 to 15 and a wellhead module (3) on which the support frame (1401) is installed, and the cavity-making inner pipe transmission short section (1) and the cavity-making outer pipe transmission short section (2) can be fixed to the wellhead module (3).

17. The lumen creation column lifting system according to claim 16, characterized in that: It also includes a sealing module (11, 12) sealed between the outer cavity tube transmission nipple (2) and the outer cavity tube (13) to prevent leakage of the dissolution inhibitor in the salt cavern gas storage.

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