Water stop packing device suitable for deep part of hydrological drill hole

Abstract

The invention belongs to the technical field of water-stop packers, and discloses a water-stop packing device suitable for the deep part of a hydrological drill hole, which comprises a middle pipe, a cylinder bottom and a cylinder barrel, the cylinder bottom and the cylinder barrel are fixedly sleeved outside the middle pipe, and the cylinder barrel and the middle pipe are encircled to form an oil cavity; the piston is arranged in the oil cavity in a sleeved mode, and the oil cavity is divided into a rod cavity and a rodless cavity. The piston rod is connected to the piston and extends downwards out of the cylinder barrel, and a connecting base arranged on the middle pipe in a sleeving mode is fixedly installed at the end of the piston rod. The rubber barrels and the air bags are arranged at intervals underground. The air bag is filled with air in advance, and the interior of the air bag is closed. The rubber sleeve is expanded through extrusion, gas injection from the upper portion to the lower portion of the well is not needed, setting is conducted through compression of gas contained in the rubber sleeve, and setting is conducted synchronously with the rubber sleeve. The rubber cylinder is pressed downwards continuously after being attached to the well wall and deformed, so that the air bag deforms and is firmly bound on the inner side, and the shoulder protrusion problem is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of water-stopping packers, specifically a water-stopping packer device suitable for deep hydrological boreholes. Background Technology

[0002] The Yonglong mining area is rich in coal resources but lacks water resources. Coal mining activities are the main factor consuming groundwater in the mining area. However, research on groundwater is not yet in-depth. In-depth research on issues such as the recharge, runoff, and discharge of pore and fissure water in the Cretaceous sandstone in the area, the changes in the water environment of the main aquifers during coal mining, and the restoration of the water environment after mining is crucial. This research is not only related to the rational utilization of water resources in the mining area but will also have a positive impact on regional ecological environmental protection.

[0003] Traditional packers typically use an air-inflating structure to inflate the air bladder. The inflated air bladder then forms a set seal after it fits tightly against the wellbore or pipe wall. This setting method requires an air compressor on the surface to supply air to the air bladder via a gas pipe. Due to the compressibility of gas, the corresponding speed is relatively slow, and the downhole air bladder is prone to shoulder protrusion, especially under high pressure differentials and large gaps. The air bladder can easily be squeezed out of the gap under the pressure differential, leading to sealing failure.

[0004] This application proposes a water-stopping sealing device to overcome the above-mentioned defects. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a water-stopping and sealing device suitable for deep hydrological boreholes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a water-stopping and sealing device suitable for deep hydrological boreholes, comprising a central tube, characterized in that: it includes a cylinder bottom and a cylinder barrel sleeved and fixedly sleeved outside the central tube, the cylinder barrel and the central tube together forming an oil cavity; a piston sleeved in the oil cavity, dividing the oil cavity into a rod cavity and a rodless cavity; a piston rod connected to the piston and extending downward out of the cylinder barrel, the end of the piston rod being fixedly installed with a connecting seat sleeved on the central tube; an oil inlet and an oil outlet, the oil inlet and the oil outlet respectively communicating with the rod cavity and the rodless cavity; the lower end of the connecting seat is also connected to a rubber cylinder and an air bladder through a support mechanism, the rubber cylinder and the air bladder being compressed and forced to deform and adhere tightly to the well wall.

[0007] Preferably, the rubber tube and the airbag are staggered, and the airbag is pre-filled with gas.

[0008] Preferably, the support mechanism is an umbrella-shaped support structure disposed inside the rubber cylinder. The support mechanism includes a support base connected to the lower end of the connecting seat, a sliding groove sleeved on the middle tube, a slider one and a slider two slidably installed on the sliding groove, and a connecting rod connecting the support base and slider one and slider two. The support base moves downward to push slider one and slider two to slide along the sliding groove.

[0009] Preferably, the extension direction of the chute coincides with the radial direction of the guide plate, and the outer end of the chute is closed.

[0010] Preferably, slider one and slider two are arranged at equal angles around the perimeter, and slider one and slider two are staggered. After being supported outward by connecting rods, slider one and slider two can form a circle.

[0011] Preferably, both slider one and slider two are provided with positioning sliders at their bottoms, and the positioning sliders are engaged in the grooves.

[0012] Preferably, a metal ring is fitted around the outer periphery of the first slider and the second slider, and the inside of the rubber cylinder is provided with two stepped surfaces, with the metal ring engaging between the two stepped surfaces; The metal ring is a copper ring with a thickness of 2.5 mm.

[0013] Preferably, a connecting sleeve is also fitted on the middle tube, the bottom end of the rubber cylinder is a hollow frustum shape and is vulcanized and bonded to the connecting sleeve, the bottom end of the connecting sleeve is supported on the clamp, and the clamp is connected to the connecting rod in the lower rubber cylinder.

[0014] Preferably, a graphite ring is provided as an inner lining between the inner wall of the connecting seat and the middle tube.

[0015] Preferably, a connecting pipe is provided at the top of the cylinder bottom. Compared with the prior art, the beneficial effects of the present invention are as follows: This invention employs a system where rubber cylinders and airbags are spaced apart downhole. The power module utilizes a hydraulic system, providing a fast and precise response from the setter. The airbags are staggered between the rubber cylinders; as the rubber cylinders deform and compress, they move and compress the airbags, filling the gaps between adjacent rubber cylinders and achieving a seal with the wellbore. Simultaneously, the deformed rubber cylinders also press against the wellbore, effectively sealing in conjunction with the airbags. The airbags are pre-filled with gas, creating a sealed environment. Expansion through compression eliminates the need for air injection from the surface; instead, the airbags utilize their own internal gas for setting, simultaneously with the rubber cylinders. After deforming against the wellbore, the rubber cylinders continue to press down, deforming the airbags and firmly securing them to the inside, preventing shoulder protrusion.

[0016] The rubber cylinder of this invention adopts an umbrella-shaped support configuration. The advantage of this structure is that when a pressure differential occurs within the well being set, the pressure acts on the umbrella-shaped structure, resulting in a tighter seal. The connecting seat pushes the support seat downwards. Initially, the connecting rod has a certain angle with the central pipe axis. As the support seat descends, the connecting rod opens accordingly, and the slider connected below the connecting rod slides outwards. The outer arc surface of slider one connects with the outer arc surface of slider two, increasing the diameter of the combined circle of slider one and slider two. This expands the rubber cylinder outwards within the well wall, causing it to adhere to the well wall. Furthermore, the support seat continues to descend, compressing the rubber cylinder and further deforming it downwards, compressing the gap between the two rubber cylinders, reducing the redundant space of the air bladder, and forcing the air bladder to deform and fill the gap, thus achieving a proper seal between the rubber cylinder and the air bladder.

[0017] By using H80 soft-pack brass as the material, under normal setting pressure, slider 1 205 and slider 2 206 expand outward, causing the outer metal ring 207 to also expand outward, allowing the metal ring 207 to fit tightly against the inner wall of the rubber cylinder 300. This ensures that the rubber cylinder 300 is subjected to uniform force, preventing the rubber cylinder 300 from getting stuck between slider 1 205 and slider 2 206 and avoiding the shoulder protrusion phenomenon, thus overcoming the defect of uneven local stress. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the water-stopping packer of the present invention when it is not set. Figure 2 This is a schematic diagram of the water-stopping packer of the present invention during setting; Figure 3 This is a cross-sectional schematic diagram of the rubber cylinder and airbag of the present invention; Figure 4 This is a schematic diagram of the unfolded slider one and slider two of the present invention; Figure 5 This is a top view of the unfolded slider one and slider two of the present invention; Figure 6 This is a schematic diagram of the structure of the guide plate of the present invention; Figure 7 This is a schematic diagram of the positioning slider of the present invention; Figure 8 This is a diagram showing the relationship between the opening diameter of the metal ring of the present invention with different thicknesses.

[0019] In the diagram: 101, central tube; 102, cylinder bottom; 103, cylinder barrel; 104, piston; 105, piston rod; 106, oil inlet; 107, oil outlet; 108, connecting seat; 201, support seat; 202, connecting rod; 203, guide plate; 204, slide groove; 205, slider one; 206, slider two; 207, metal ring; 208, connecting sleeve; 209, clamp; 210, positioning slider; 300, rubber tube; 400, air bag; 500, connecting pipe. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 3 As shown, the present invention provides a water-stopping and sealing device suitable for deep hydrological boreholes, including a central tube 101, a cylinder bottom 102 and a cylinder barrel 103 sleeved and fixedly sleeved outside the central tube 101, the cylinder barrel 103 and the central tube 101 together forming an oil cavity; a piston 104 sleeved in the oil cavity, dividing the oil cavity into a rod cavity and a rodless cavity; a piston rod 105 connected to the piston 104 and extending downward out of the cylinder barrel 103, the end of the piston rod 105 being fixedly installed with a connecting seat 108 sleeved on the central tube 101; an oil inlet 106 and an oil outlet 107, the oil inlet 106 and the oil outlet 107 respectively communicating with the rod cavity and the rodless cavity; the lower end of the connecting seat 108 is also connected to a rubber cylinder 300 and an air bladder 400 through a support mechanism, the rubber cylinder 300 and the air bladder 400 are compressed and forced to deform and adhere to the well wall.

[0022] like Figure 3 As shown, the rubber cylinder 300 and the airbag 400 are staggered, and the airbag 400 is pre-filled with gas.

[0023] In this embodiment, rubber cylinders 300 and airbags 400 are spaced apart downhole. The power module uses a hydraulic system, which provides a fast and precise response from the setter. Oil is injected downwards from the wellhead. A conduit connects the inlet 106 and outlet 107. During setting, oil is injected into the inlet 106, filling the annular cavity formed by the cylinder 103 and the central tube 101. The hydraulic pressure in the rodless chamber pushes the piston 104 downwards, which in turn pushes the piston rod 105 downwards, discharging the hydraulic oil from the rod chamber. The piston rod 105 pushes the connecting seat 108 to compress the lower rubber cylinders 300. The airbags 400 are staggered between the rubber cylinders 300. When the rubber cylinders 300 deform and compress, they move and compress the airbags 400, causing them to deform and fill the gaps between adjacent rubber cylinders 300, achieving a seal with the wellbore. Simultaneously, the deformation of the rubber sleeve 300 will also support it against the well wall, effectively sealing it in conjunction with the airbag 400. The airbag 400 is pre-filled with gas, creating a sealed environment inside. It expands by compression, eliminating the need for downward injection from the wellhead; instead, it uses the pressure of its own internal gas to set, simultaneously setting with the rubber sleeve 300. After deforming against the well wall, the rubber sleeve 300 continues to press down, deforming the airbag 400 and firmly securing it inside, preventing shoulder protrusion.

[0024] like Figure 4 As shown, the support mechanism is an umbrella-shaped support structure set inside the rubber cylinder 300. The support mechanism includes a support base 201 connected to the lower end of the connecting seat 108, a slide groove 204 sleeved on the middle tube 101, a slider 1 205 and a slider 206 slidably installed on the slide groove 204, and a connecting rod 202 connecting the support base 201 and slider 1 205 and slider 2 206. The support base 201 pushes slider 1 205 and slider 2 206 to slide along the slide groove 204 when it moves downward.

[0025] The rubber sleeve 300 adopts an umbrella-shaped support configuration. The advantage of this structure is that when a pressure difference occurs in the well where it is set, the pressure acts on the umbrella-shaped structure, which will make it set more tightly.

[0026] The connecting seat 108 pushes the support seat 201 downward. Initially, the connecting rod 202 has a certain angle with the axis of the central tube 101. Therefore, the downward movement of the support seat 201 causes the connecting rod 202 to open accordingly, and the slider 205 connected below the connecting rod 202 slides outward. For example... Figure 4As shown in the diagram above, slider 1 205 and slider 2 206 are staggered. When not in use, slider 1 205 is retracted inside slider 2 206, with its inclined side still intersecting the inclined side of slider 2 206. When slider 1 205 slides outward via connecting rod 202, it pushes slider 2 206 outward simultaneously. Ultimately, the outer arc surface of slider 1 205 and the outer arc surface of slider 2 206 come into contact, expanding the diameter of the combined circle of slider 1 205 and slider 2 206. This expands the rubber cylinder 300 outward and fits it against the well wall inside the rubber cylinder 300. Furthermore, the support seat 201 continues to descend and compress, forcing the lower part of the rubber cylinder 300 to deform further, compressing the gap between the two rubber cylinders 300, reducing the redundant space of the airbag 400, and forcing the airbag 400 to deform and fill the gap, thus achieving a proper sealing between the rubber cylinder 300 and the airbag 400.

[0027] like Figure 4 and Figure 6 As shown, the extension direction of the slide groove 204 coincides with the radial direction of the guide plate 203, and the outer end of the slide groove 204 is closed.

[0028] The groove 204 is a guide groove that coincides with the radial direction of the guide plate 203. It is evenly spaced, with each groove 204 corresponding to one slider 205 or one slider 206. The grooves 204 extend radially towards the guide plate 203 with consistent spacing, ensuring synchronous sliding expansion of each set of sliders 205 and 206. The outer end of the groove 204 is a closed structure, which limits the maximum stroke of sliders 205 and 206, preventing them from detaching from the guide plate 203 due to excessive pressure. An upper edge is provided above sliders 205 and 206 to expand their coverage area; its specific size is determined by the internal space of the rubber cylinder 300 and the inner wall area of ​​the metal ring 207.

[0029] like Figure 4 and 5 As shown, slider 1 205 and slider 2 206 are arranged at equal angles around the perimeter. Slider 1 205 and slider 2 206 are staggered. After being supported outward by connecting rod 202, slider 1 205 and slider 2 206 can form a circle.

[0030] Slider 1 205 and slider 2 206 are staggered. Initially, slider 1 205 is positioned between the two sliders 206. Slider 1 205 is pushed outwards along the slide groove 204 by the connecting rod 202. Its inclined side cooperates with the inclined side of slider 2 206 to open up the two sliders 206. Multiple sliders 1 205 and slider 2 206 synchronously support each other, ultimately forming a larger circular ring, which pushes the rubber cylinder 300 open from the inside and against the well wall. (As shown) Figure 5As shown, the top image shows the state of slider 1 205 and slider 2 206 before they are opened, and the bottom image shows the state of slider 1 205 and slider 2 206 after they are opened.

[0031] like Figure 7 As shown, both slider 1 205 and slider 2 206 have a positioning slider 210 at their bottom, which engages in the groove 204.

[0032] The positioning slider 210 serves as a guide and limiter for slider 1 205 and slider 2 206. Its lower part is set as a parallelogram plate surface, which is used to fit the inner inclined surface of the end of the slide groove 204 when slider 1 205 and slider 2 206 run to the end. The inclined end design of the positioning slider 210 allows it to extend outward as far as possible. Compared with the vertical side, it has better stability when fitting the end of the slide groove 204 due to the larger fitting surface, and the outward displacement distance is also longer.

[0033] like Figure 4 and 5 As shown, a metal ring 207 is fitted around the outer periphery of slider 1 205 and slider 2 206. The rubber cylinder 300 has two stepped surfaces inside, and the metal ring 207 is engaged between the two stepped surfaces. The metal ring 207 is a copper ring with a thickness of 2.5 mm.

[0034] The metal ring 207 is made of soft metal; in this embodiment, soft-pack brass H80 is used. Its working process is as follows: Under normal setting pressure, sliders 1 (205) and 2 (206) expand outwards, causing the outer metal ring 207 to also expand outwards, allowing it to fit tightly against the inner wall of the rubber cylinder 300. This ensures even force distribution on the rubber cylinder 300, preventing it from getting stuck between sliders 1 (205) and 2 (206) and avoiding uneven local stress. Once the rubber cylinder 300 is tightly against the well wall, the metal ring 207 stops expanding. The interior of the rubber cylinder 300 has two stepped surfaces for limiting the metal ring 207, restricting its direction of action radially outwards.

[0035] Soft-pack brass is available in various thicknesses: 0.5mm, 1.0mm, 1.5mm, 1.75mm, 2.0mm, 2.5mm, and 3.0mm. After verification, these seven thicknesses of metal ring 207 unfold as follows... Figure 8As shown in the figure, the results indicate that as the thickness of the metal ring 207 increases, its opening displacement distance roughly follows a parabola, exhibiting a process of first increasing and then decreasing, reaching its maximum value at 2.5 mm. Therefore, 2.5 mm thickness serves as a dividing point for its stiffness. When the thickness is less than 2.5 mm, its stiffness is relatively low, and its expansion range increases with the increase of the metal ring 207 thickness. When the thickness is greater than 2.5 mm, its stiffness is too high, and under normal setting pressure, it cannot open effectively. Therefore, a metal ring 207 with a thickness of 2.5 mm is the optimal choice.

[0036] like Figure 3 As shown, a connecting sleeve 208 is also fitted on the middle tube 101. The bottom end of the rubber cylinder 300 is a hollow frustum shape and is vulcanized and bonded to the connecting sleeve 208. The bottom end of the connecting sleeve 208 is supported on the clamp 209. The clamp 209 is connected to the connecting rod 202 in the lower rubber cylinder 300.

[0037] The bottom of the rubber cylinder 300 is set in a frustum shape and vulcanized on the connecting sleeve 208. When expanding and pressing down, its frustum-shaped bottom can provide a large redundancy range. Compared with the horizontal ground, its deformation capacity is improved, and it can extend into the airbag 400, forcing the airbag 400 to deform, which is beneficial to compressing the gap between two adjacent rubber cylinders 300.

[0038] like Figure 1 and Figure 2 As shown, a graphite ring is provided as a liner between the inner wall of the connecting seat 108 and the central tube 101. The graphite ring, as a liner between the two, provides both good lubrication and excellent sealing and pressure resistance.

[0039] like Figure 1 and Figure 2 As shown, a pipe connector 500 is provided on the top of the cylinder bottom 102. The pipe connector 500 is used for upward pipe connection.

[0040] Working principle and usage process of this invention: Oil is injected downwards from the wellhead. The conduit connects the inlet 106 and the outlet 107. During setting, oil is injected into the inlet 106, and hydraulic oil is injected into the annular cavity formed by the cylinder 103 and the middle tube 101. The hydraulic pressure in the rodless chamber pushes the piston 104 downwards. The downward movement of the piston 104 pushes the piston rod 105 downwards and discharges the hydraulic oil in the rod chamber. The piston rod 105 pushes the connecting seat 108, which in turn pushes the support seat 201 below downwards.

[0041] As the support seat 201 descends, the connecting rod 202 opens accordingly, and the slider 205 connected below the connecting rod 202 slides outward. Slider 205 and slider 206 are staggered. When slider 205 is not set, it is retracted inside slider 206, and its inclined side still intersects with the inclined side of slider 206. When slider 205 slides outward through the connecting rod 202, it pushes slider 206 outward in sync. Finally, the outer arc surface of slider 205 and the outer arc surface of slider 206 come into contact, expanding the diameter of the combined circle of slider 205 and slider 206. Inside the rubber cylinder 300, this pushes the rubber cylinder 300 outward to fit against the well wall. Furthermore, the support seat 201 continues to press downwards, forcing the rubber cylinder 300 to deform further downwards, compressing the gap between the two rubber cylinders 300, reducing the redundant space of the airbag 400, and forcing the airbag 400 to deform and fill the gap, thus achieving a seated connection between the rubber cylinder 300 and the airbag 400.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-stopping and sealing device suitable for deep hydrological boreholes, comprising a central pipe (101), characterized in that: It includes a cylinder bottom (102) and a cylinder barrel (103) that are sleeved on the outside of the central tube (101), and the cylinder barrel (103) and the central tube (101) together form an oil cavity; Piston (104), the piston (104) is sleeved in the oil chamber, dividing the oil chamber into a rod chamber and a rodless chamber; Piston rod (105), the piston rod (105) is connected to piston (104) and extends downward out of cylinder (103), and the end of the piston rod (105) is fixedly installed with a connecting seat (108) sleeved on the middle tube (101). An oil inlet (106) and an oil outlet (107) are respectively connected to the rod chamber and the rodless chamber; The lower end of the connecting seat (108) is also connected to a rubber cylinder (300) and an air bag (400) through a support mechanism, which compresses the rubber cylinder (300) and the air bag (400) to force them to deform and stick to the well wall.

2. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 1, characterized in that: The rubber cylinder (300) and the airbag (400) are staggered, and the airbag (400) is pre-filled with gas.

3. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 2, characterized in that: The support mechanism is an umbrella-shaped support structure set inside the rubber cylinder (300). The support mechanism includes a support seat (201) connected to the lower end of the connecting seat (108), a slide groove (204) sleeved on the middle tube (101), a slider one (205) and a slider two (206) slidably installed on the slide groove (204), and a connecting rod (202) connecting the support seat (201) and slider one (205) and slider two (206). The support seat (201) pushes slider one (205) and slider two (206) to slide along the slide groove (204) when it moves downward.

4. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 3, characterized in that: The extension direction of the groove (204) coincides with the radial direction of the guide plate (203), and the outer end of the groove (204) is closed.

5. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 4, characterized in that: The slider one (205) and slider two (206) are arranged at equal angles around the circumference. The slider one (205) and slider two (206) are staggered. The slider one (205) and slider two (206) can form a circle after being supported outward by the connecting rod (202).

6. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 5, characterized in that: Both slider one (205) and slider two (206) are provided with positioning sliders (210) at their bottoms, and the positioning sliders (210) are engaged in the grooves (204).

7. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 5, characterized in that: A metal ring (207) is fitted around the outer periphery of the first slider (205) and the second slider (206). The rubber cylinder (300) has two stepped surfaces inside, and the metal ring (207) is engaged between the two stepped surfaces. The metal ring (207) is a copper ring with a thickness of 2.5 mm.

8. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 2, characterized in that: A connecting sleeve (208) is also fitted on the middle tube (101). The bottom end of the rubber cylinder (300) is a hollow frustum and is vulcanized and bonded to the connecting sleeve (208). The bottom end of the connecting sleeve (208) is supported on the clamp (209). The clamp (209) is connected to the connecting rod (202) in the lower rubber cylinder (300).

9. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 1, characterized in that: A graphite ring is provided as an inner lining between the inner wall of the connecting seat (108) and the middle tube (101).

10. A water-stopping and sealing device suitable for deep hydrological boreholes according to claim 1, characterized in that: A pipe connector (500) is provided on the top of the cylinder bottom (102).

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