Pressure-maintaining and gas-maintaining light-weight multidirectional remote pressure-maintaining triggering device and method
By designing a water circuit regulating device in conjunction with a differential mechanism, and using a pressurized water source to remotely operate the differential mechanism at the bottom of the deep hole, the problem of the inability to recover rock cores in coal mine roadways in existing devices has been solved, achieving stable and reliable rock core recovery and pressure-maintaining storage, and the device structure is lightweight.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-03-27
AI Technical Summary
Existing remote triggering devices are difficult to activate effectively in horizontal or inclined shafts in coal mine roadways, resulting in the inability to recover core samples properly. In particular, the lightweight plastic balls cannot effectively block water channels, causing the differential mechanism to malfunction.
A lightweight, multi-directional, remote pressure-holding triggering device for pressure and gas retention was designed. Through the cooperation of a water circuit regulating device and a differential mechanism, the differential mechanism at the bottom of the deep hole is remotely operated using a pressurized water source to drive and lift the pressure-holding triggering structure inside the pressure-holding core sampler, thereby realizing core recovery and pressure-holding storage.
It achieves stable and reliable core recovery and pressure storage at any angle, effectively blocks waterways, ensures differential lifting force, and features a lightweight remote triggering device, improving operational stability and reliability.
Smart Images
Figure CN121738499A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure-holding coring technology, and in particular to a lightweight, multi-directional, remote pressure-holding triggering device and method for pressure-holding and gas-holding. Background Technology
[0002] With the continuous development of coal resources, coal seam gas sampling is gradually moving towards deeper strata. This trend not only places higher demands on the accuracy and reliability of gas sampling technology, but also makes it difficult for traditional triggering devices to meet the operational needs of complex deep environments.
[0003] Existing remote triggering applications are mainly divided into three categories: vertical wells, horizontal wells, and inclined wells. Remote triggering methods can be divided into using a fishing device with a steel wire rope or a hydraulic differential mechanism. However, as the sampling depth increases, the fishing device faces certain limitations in remote triggering at great depths (e.g., requiring a very long steel wire rope). Therefore, in deeper vertical wells, a steel ball can be dropped into the borehole at the orifice. Under gravity, the steel ball enters the differential mechanism, altering the water flow channel, achieving hydraulic differential lifting, and triggering the pressure-holding structure inside the pressure-holding coring device, thus achieving core recovery and pressure sealing.
[0004] However, in horizontal or inclined shafts of coal mine roadways, gravity cannot be effectively utilized. Therefore, lightweight plastic balls are used to block water passages. However, due to their light weight, the large drilling angle, and the complex path, these plastic balls cannot be transported in time and cannot effectively block water passages. Consequently, the differential mechanism cannot start normally, resulting in the inability to recover the core. Summary of the Invention
[0005] To solve the above-mentioned technical problems, the present invention provides a lightweight, multi-directional, remote pressure-holding triggering device and method for pressure and gas holding.
[0006] This invention is achieved through the following technical solution:
[0007] The pressure-holding and gas-holding lightweight multi-directional remote pressure-holding triggering device provided in this application includes a core extractor connecting pipe with a first spiral guide surface and a second spiral guide surface on its top surface, a triggering body installed inside the core extractor connecting pipe and capable of axially moving a certain distance within the core extractor connecting pipe, and a water channel regulating device with an inclined surface at the bottom. The first spiral guide surface is higher than the second spiral guide surface. The core extractor connecting pipe has a first channel and a second channel spaced apart along the circumferential direction in its inner wall. The top of the first channel opens into the first spiral guide surface, the top of the second channel opens into the second spiral guide surface, and the bottoms of both the first and second channels open into the inner sidewall of the core extractor connecting pipe. The triggering body has a piston, and the core extractor connecting pipe has a piston chamber inside. The piston can move within the piston chamber. The bottom of the first channel communicates with the inside of the piston chamber, and the bottom opening of the second channel is located below the piston chamber. The inclined surface of the water channel regulating device is adapted to the first spiral guide surface and the second spiral guide surface, and the inclined surface of the water channel regulating device can move along the first spiral guide surface until it falls on the second spiral guide surface.
[0008] Optionally, the bottom of the central piston has a tile-shaped protrusion, with an inclined surface located on the bottom surface of the tile-shaped protrusion, and the inner surface of the tile-shaped protrusion can fit against the central protrusion at the top center of the core extractor connecting tube.
[0009] Optionally, a one-way valve is installed on the side wall of the core extractor connecting pipe, and the one-way valve communicates with the piston chamber.
[0010] Optionally, a conduit for guiding the axial movement of the trigger body is installed inside the core retrieval device connecting tube.
[0011] Optionally, the water circuit regulating device includes a polyurethane piston, a central piston, and an upper connecting pipe. Both the polyurethane piston and the central piston are mounted on the upper connecting pipe. The polyurethane piston is located above the central piston. The side wall of the central piston has a first through hole, and the side wall of the upper connecting pipe has a second through hole. The first through hole and the second through hole are connected.
[0012] Optionally, the length of the core extractor connecting tube is 1m.
[0013] The method of using the lightweight, multi-directional, remote pressure-holding triggering device for gas and pressure holding provided in this application includes the following steps:
[0014] The lower end of the coring device connecting pipe is connected to the outer tube of the pressure-holding coring device, and the trigger body is connected to the core cylinder of the pressure-holding coring device and sent into the borehole to complete coring.
[0015] After the coring tool is drilled into place, the water channel adjustment device is placed into the hollow coring rod at the borehole opening;
[0016] Then pressurized water is introduced into the borehole, and the water channel regulating device is sent to the bottom of the hole. During this process, if the inclined surface at the bottom of the central piston happens to fall directly on the second spiral guide surface, the central piston will directly block the second channel; even if the inclined surface at the bottom of the central piston falls on the first spiral guide surface, due to the height difference between the first and second spiral guide surfaces, the central piston will still spiral down along the first spiral guide surface until it falls on the second spiral guide surface under the action of hydraulic force, thus achieving the sealing of the second channel.
[0017] After the central piston blocks the top opening of the second channel, the liquid enters the piston chamber of the coring device connecting pipe through the first channel. Under the action of hydraulic force, the piston moves upward, thereby driving the trigger body to move upward and the core cylinder of the coring device to move upward, realizing the recovery and storage of the core inside the pressure-holding coring device.
[0018] Once the piston reaches its designed end position, it passes the check valve, allowing pressure to be released through the check valve.
[0019] Compared with the prior art, this application has at least the following beneficial effects:
[0020] 1. This application, through the combined use of a water circuit regulating device and a differential mechanism, can remotely operate the differential mechanism at the bottom of the deep hole via a pressurized water source at the orifice, thereby driving the lifting of the pressure-holding trigger structure inside the pressure-holding core sampler, and remotely realizing sample recovery and pressure-holding storage for pressure-holding core sampling;
[0021] 2. The water circuit regulating device of this application can be inserted into the borehole at the tunnel opening and sent to the bottom of the hole under hydraulic drive. After reaching the bottom, it can effectively block the normal circulating water circuit, stably provide differential lifting force, and reliably realize the remote triggering of the pressure-holding coring device;
[0022] 3. This application can send the water circuit adjustment device to the target position as long as a pressurized water source is injected, and can achieve triggering at any angle. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a cross-sectional view of the lightweight multi-directional remote pressure holding trigger device for pressure holding and gas holding in the first state of the embodiment.
[0025] Figure 2 This is a cross-sectional view of the lightweight multi-directional remote pressure holding trigger device for pressure holding and gas holding in the second state of the embodiment.
[0026] Figure 3 This is a perspective view of the lightweight multi-directional remote pressure holding triggering device for pressure holding and gas holding in the first state of the embodiment;
[0027] Figure 4 This is a schematic diagram of the water circuit regulating device in the embodiment;
[0028] Figure 5 This is a schematic diagram of the catheter structure in the embodiment;
[0029] Figure 6 This is a schematic diagram of the core extractor connecting tube in the embodiment;
[0030] Figure 7 This is a schematic diagram of the pressure-holding coring device in the initial state in the embodiment;
[0031] Figure 8 This is a schematic diagram of the pressure-holding core sampling device in the final state of the embodiment. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.
[0034] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0036] like Figures 1-3 As shown, the preferred embodiment of the present invention discloses a lightweight, multi-directional, remote pressure-maintaining triggering device for gas preservation and pressure holding, comprising a water circuit regulating device 6 and a differential mechanism. The differential mechanism includes a trigger body 2 and a core sampler connecting pipe 3. The trigger body 2 is installed inside the core sampler connecting pipe 3 and can move axially a certain distance relative to the core sampler connecting pipe 3. The trigger body 2 has a piston 20, and there is a piston chamber inside the trigger body 2. The piston 20 can move within the piston chamber and is sealed to the core sampler connecting pipe 3. After switching to the hydraulic differential drive water circuit, under the action of hydraulic force, the piston 20 moves upward, thereby driving the trigger body 2 to move, realizing the recovery and pressure-maintaining storage of the core inside the pressure-maintaining and gas-maintaining core sampler.
[0037] In some embodiments, the triggering body 2 includes an upper section 21, a middle section 22 and a lower section 23 arranged sequentially from top to bottom, with the lower section 23 used for a sealed connection with the core cylinder of the coring device.
[0038] In some embodiments, the piston 20 is fixed to the upper end of the upper section 21 by the piston fixing head 25.
[0039] The water path adjustment device includes a polyurethane piston 61, a central piston 62, and an upper connecting pipe 63. The outer diameter of the polyurethane piston 61 is slightly smaller than the inner diameter of the core drill rod, and the two are fitted with a clearance. Therefore, the water path adjustment device can be hydraulically pushed into the bottom of the hole through the drill rod at the borehole opening and interact with the hydraulic triggering mechanism.
[0040] Both the polyurethane piston 61 and the central piston 62 are mounted on the upper connecting pipe 63. The polyurethane piston 61 is located above the central piston 62. The side wall of the central piston 62 has a first through hole 621, and the side wall of the upper connecting pipe 63 has a second through hole 631. The first through hole 621 and the second through hole 631 are connected and used as a drilling fluid flow channel.
[0041] The polyurethane piston 61 is lightweight, and the resistance caused by gravity is small when it moves horizontally or diagonally upward.
[0042] In some embodiments, the central piston 62 is threadedly connected to the upper connecting pipe 63.
[0043] like Figure 3 , Figure 6As shown, the top surface of the core extractor connecting tube 3 has a first spiral guide surface 31 and a second spiral guide surface 32. The first spiral guide surface 31 is higher than the second spiral guide surface 32. The inner wall of the core extractor connecting tube 3 is provided with a first channel 33 and a second channel 34 at intervals along the circumferential direction. The top of the first channel 33 opens into the first spiral guide surface 31, and the top of the second channel 34 opens into the second spiral guide surface 32. The bottoms of the first channel 33 and the second channel 34 both open into the inner wall of the core extractor connecting tube 3. The bottom of the first channel 33 communicates with the inside of the piston chamber, and the bottom opening of the second channel 34 is lower than the piston chamber.
[0044] The bottom of the central piston 62 can be fitted onto the top of the core extractor connecting tube 3, such as... Figure 4 As shown, the bottom surface of the central piston 62 is an inclined surface 622 that matches the second spiral guide surface 32 and the first spiral guide surface 31.
[0045] In some embodiments, the bottom of the central piston 62 has a tile-shaped protrusion 622, and the inclined surface 622 is located on the bottom surface of the tile-shaped protrusion 622. The inner surface of the tile-shaped protrusion 622 is used to fit against the central protrusion 36 at the top center of the core extractor connecting tube 3.
[0046] Preferably, the tile-shaped protrusion 622 is semi-cylindrical, and the central protrusion 36 has a semi-cylindrical surface that matches the tile-shaped protrusion 622.
[0047] Preferably, the first spiral guide surface 31 and the second spiral guide surface 32 are offset by 180° in the circumferential direction.
[0048] The first channel 33 and the second channel 34 each serve as two water paths in the connecting pipe 3 of the core extractor. The second channel 34 serves as the normal circulating water path, and the first channel 33 serves as the hydraulic differential drive trigger water path. The water path adjustment device can block the normal circulating water path, thereby driving the hydraulic differential mechanism to work normally.
[0049] In some embodiments, the inner wall of the core extractor connecting tube 3 has a limiting step 35 for limiting the displacement of the trigger body 2. When the piston 20 moves to the point where it abuts against the limiting step 35, the trigger body 2 cannot move downward relative to the core extractor connecting tube 3. The bottom outlet of the first channel 33 is higher than the limiting step 35, and the bottom outlet of the second channel 34 is lower than the limiting step 35.
[0050] A one-way valve 4 is installed on the side wall of the core extractor connecting tube 3. The one-way valve 4 is higher than the bottom outlet of the first channel 33 and communicates with the piston chamber. In some embodiments, the one-way valve 4 is located in the upper part of the core extractor connecting tube 3.
[0051] To guide the axial movement of the trigger body 2, a conduit 5 is installed inside the core extractor connecting tube 3. For example... Figure 5As shown, the conduit 5 has a guide surface 51 that is adapted to the outer surface of the trigger body 2. The conduit 5 and the guide surface 51 are fitted with a clearance; in order not to affect the normal water circulation, the conduit 5 has a water passage hole 52.
[0052] In some embodiments, the core extractor is 0.8-1m in length, lightweight, and easy to use.
[0053] The method of using the lightweight, multi-directional, remote pressure-holding and gas-holding trigger device includes the following steps:
[0054] S1, as Figure 7 As shown, the lower end of the coring device connecting pipe 3 is connected to the outer tube of the pressure-holding coring device 1, and the trigger body 2 is connected to the core cylinder of the pressure-holding coring device 1, and is sent into the borehole to complete coring. The structure of the pressure-holding coring device 1 is conventional technology in this field and will not be described in detail here.
[0055] S2, After the coring device is drilled into place, the water channel adjustment device is placed into the hollow coring rod at the borehole opening in the roadway.
[0056] S3, then pressurized water is introduced into the borehole, and the water flow regulating device 6 is sent to the bottom of the hole, such as... Figure 8 As shown, during this process, if the inclined surface 623 at the bottom of the central piston 62 happens to fall directly on the second spiral guide surface 32, the central piston 62 will directly block the second channel 34. Even if the inclined surface 623 at the bottom of the central piston 62 falls on the first spiral guide surface 31, due to the height difference between the first spiral guide surface 31 and the second spiral guide surface 32, under the action of hydraulic force, the central piston 62 will still spiral down along the first spiral guide surface 31 until it falls on the second spiral guide surface 32, thus sealing the second channel 34. The design of the first spiral guide surface 31 and the second spiral guide surface 32 can ensure that the water circuit regulating device 6 can cut off the normal circulating water circuit.
[0057] S4. After the central piston 62 blocks the top opening of the second channel 34, the normal circulating water path of the core extractor connecting pipe 3 is cut off, and the hydraulic differential triggering process is started.
[0058] S5, the liquid enters the piston chamber of the coring device connecting pipe 3 through the first channel 33. Under the action of hydraulic force, the piston 20 moves upward, thereby driving the trigger body 2 to move upward and the coring device center rod assembly to move upward, realizing the recovery and storage of rock core inside the pressure-maintaining and gas-maintaining coring device.
[0059] S6, when piston 20 moves to the designed end position, piston 20 passes the one-way valve 4, the internal pressure environment is released, and pressure is released through the one-way valve 4.
[0060] The outer tube of the remote triggering device can be directly connected to the drill pipe, resulting in a lightweight structure. The hydraulically driven central rod assembly of the triggering body, which is also the core extractor, allows more effective force to be applied to the triggering body, making the overall length shorter than that of the twin-cylinder type.
[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A lightweight, multi-directional, remote pressure-holding triggering device for gas and pressure maintenance, characterized in that: include: The core extractor connecting tube (3) has a first spiral guide surface (31) and a second spiral guide surface (32) on its top surface. A trigger body (2) installed inside the core extractor connecting tube (3) and capable of axially moving a certain distance within the core extractor connecting tube (3); and A water channel regulating device (6) with a slope (622) at the bottom; The first spiral guide surface (31) is higher than the second spiral guide surface (32). The inner wall of the core extractor connecting tube (3) is provided with a first channel (33) and a second channel (34) at intervals along the circumferential direction. The top of the first channel (33) opens to the first spiral guide surface (31), the top of the second channel (34) opens to the second spiral guide surface (32), and the bottom of the first channel (33) and the second channel (34) both open to the inner wall of the core extractor connecting tube (3). The trigger body (2) has a piston (20), the core extractor connecting tube (3) has a piston chamber inside, the piston (20) can move in the piston chamber, the bottom of the first channel (33) is connected to the inside of the piston chamber, and the bottom opening of the second channel (34) is located below the piston chamber. The inclined surface (622) of the water path regulating device (6) is adapted to the first spiral guide surface (31) and the second spiral guide surface (32), and the inclined surface (622) of the water path regulating device (6) can move along the first spiral guide surface (31) to fall on the second spiral guide surface (32).
2. The lightweight, multi-directional, remote pressure-holding triggering device for maintaining pressure and gas supply according to claim 1, characterized in that: The bottom of the central piston (62) has a tile-shaped protrusion (622), and the inclined surface (622) is located on the bottom surface of the tile-shaped protrusion (622). The inner surface of the tile-shaped protrusion (622) can fit with the central protrusion (36) at the top center of the core extractor connecting tube (3).
3. The lightweight, multi-directional, remote pressure-holding triggering device for maintaining pressure and gas supply according to claim 1, characterized in that: The side wall of the core extractor connecting pipe (3) is equipped with a one-way valve (4), which is connected to the piston chamber.
4. The lightweight, multi-directional, remote pressure-holding triggering device for maintaining pressure and gas supply according to claim 1, characterized in that: A conduit (5) for guiding the axial movement of the trigger body (2) is installed inside the core extractor connecting tube (3).
5. The lightweight, multi-directional, remote pressure-holding triggering device for maintaining pressure and gas supply according to claim 1, characterized in that: The water circuit regulating device (6) includes a polyurethane piston (61), a central piston (62) and an upper connecting pipe (63). The polyurethane piston (61) and the central piston (62) are both mounted on the upper connecting pipe (63). The polyurethane piston (61) is located above the central piston (62). The side wall of the central piston (62) has a first through hole (621), and the side wall of the upper connecting pipe (63) has a second through hole (631). The first through hole (621) and the second through hole (631) are connected.
6. The lightweight, multi-directional, remote pressure-holding triggering device for maintaining pressure and gas supply according to claim 1, characterized in that: The length of the core extractor connecting tube (3) is 1m.
7. The method of using the lightweight multi-directional remote pressure-holding triggering device for pressure holding and gas maintenance according to any one of claims 1-6, characterized in that: Includes the following steps: The lower end of the coring device connecting pipe (3) is connected to the outer tube of the pressure-holding coring device (1), and the trigger body (2) is connected to the core cylinder of the pressure-holding coring device (1) and sent into the borehole to complete coring; After the core drill is drilled into place, the water channel adjustment device (6) is placed into the hollow core drill rod at the borehole opening; Then pressurized water is introduced into the borehole, and the water channel regulating device (6) is sent to the bottom of the hole. During this process, if the inclined surface (623) at the bottom of the central piston (62) happens to fall directly on the second spiral guide surface (32), the central piston (62) will directly block the second channel (34). Even if the inclined surface (623) at the bottom of the central piston (62) falls on the first spiral guide surface (31), due to the height difference between the first spiral guide surface (31) and the second spiral guide surface (32), under the action of hydraulic force, the central piston (62) will still spiral down along the first spiral guide surface (31) until it falls on the second spiral guide surface (32), thus sealing the second channel (34). After the central piston (62) blocks the top opening of the second channel (34), the liquid enters the piston chamber of the core feeder connecting pipe (3) through the first channel (33). Under the action of hydraulic force, the piston (20) moves upward, thereby driving the trigger body (2) to move upward, and the core feeder core cylinder moves upward, realizing the recovery and pressure storage of the core inside the pressure-holding core feeder (1). When the piston (20) moves to the design end position, the piston (20) passes the one-way valve (4) and releases pressure through the one-way valve (4).