A well kill plug device

Abstract

The application provides a well killing plugging device, which comprises a fixing cylinder arranged in a well bore, an inner tube capable of being sealingly connected in the fixing cylinder, a high-pressure glass sealingly arranged in the inner tube, and a shear pin sleeve fixedly arranged on the inner wall of the inner tube, wherein the shear pin sleeve is arranged downstream of the high-pressure glass, and the high-pressure glass is configured to be broken after being collided against the shear pin sleeve under the action of pressure. The fixing cylinder of the application is arranged in the well bore in advance, and then the inner tube and various components arranged on the inner tube are sent into the fixing cylinder by pumping, so that the well bore is plugged. When it is necessary to release the plugging, greater pumping pressure is applied to push the high-pressure glass to collide against the shear pin sleeve, so that the high-pressure glass is broken, the well bore is unplugged, and no adverse effect is caused on subsequent work.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas drilling technology, specifically, it relates to a non-pressure well plugging device. Background Technology

[0002] Currently, in the development of ultra-low porosity and ultra-low permeability reservoirs in oil and gas fields, horizontal well development mainly relies on casing-fracturing. Traditionally, during casing-fracturing, wellbore pressure is reduced through blowout and fluid drainage; that is, the well is successfully controlled with a certain density of kill fluid before proceeding with other operations. However, kill operations not only suffer from severe kill fluid loss but also frequently experience well kicks due to gas intrusion. To ensure well control safety, it is necessary to increase the density and volume of the kill fluid. However, this approach increases the risk of reservoir damage, particularly for horizontal wells and natural gas wells, leading to incalculable losses in subsequent production. Summary of the Invention

[0003] To address the technical problems described above, this invention aims to provide a non-killing well plugging device that can replace existing well control operations, ensuring well control safety and causing no loss to subsequent production.

[0004] According to the present invention, a non-pressure well plugging device is provided, comprising: a fixed cylinder for fixedly disposed inside a wellbore; an inner tube capable of being sealed and snapped into the inside of the fixed cylinder; a high-pressure glass disposed sealed inside the inner tube; and a shearing sleeve fixedly disposed on the inner wall of the inner tube, wherein the shearing sleeve is disposed downstream of the high-pressure glass, and the high-pressure glass is configured to break upon impact with the shearing sleeve under pressure.

[0005] In one embodiment, a sliding sleeve is provided inside the inner tube in a sealed manner, and the high-pressure glass is fixedly disposed inside the sliding sleeve. The sliding sleeve and the shear pin sleeve are connected by shear pins.

[0006] In one embodiment, the clipper sleeve includes a fixing part and a breaking tooth, the outer diameter of the breaking tooth is smaller than the outer diameter of the fixing part, the fixing part is fixedly connected to the inner tube, and the breaking tooth extends into the sliding sleeve.

[0007] In one embodiment, the fixing part is axially spaced from the sliding sleeve, and the breaking tooth is axially spaced from the high-pressure glass, to provide acceleration space for the high-pressure glass to collide with the shear sleeve.

[0008] In one embodiment, a seal and a large rubber cup are provided on the outside of the inner tube for sealing connection with the fixed cylinder.

[0009] In one embodiment, a spring sleeve is fixedly provided on the outside of the inner tube. The spring sleeve includes a sliding part, an expansion part, and a fitting part connected in sequence. In its natural state, the outer diameter of the expansion part is larger than the outer diameters of the sliding part and the fitting part. A groove that can cooperate with the expansion part of the spring sleeve is provided on the inner wall of the fixed cylinder.

[0010] In one embodiment, a locking sleeve is also provided outside the inner tube. The locking sleeve is configured such that when the spring sleeve engages with the slot, the locking sleeve can move under pressure to the annular space between the spring sleeve and the inner tube, thereby preventing the expansion portion of the spring sleeve from contracting and moving out of the slot.

[0011] In one embodiment, two sets of seals are provided, and the spring sleeve and the locking sleeve are disposed between the two sets of seals. The inner side of the locking sleeve is provided with a groove to form an annular cavity with the inner tube. A through hole communicating with the annular cavity is provided on the tube wall of the inner tube. The area of ​​the annular cavity near the end face of the spring sleeve along the axial direction is greater than the area of ​​the annular cavity away from the end face of the spring sleeve along the axial direction.

[0012] In one embodiment, a retaining ring is provided on the outer wall of the inner tube, and a lower end ring including a retaining groove is provided at the end of the locking sleeve away from the spring sleeve. The lower end ring is configured such that when the locking sleeve moves between the spring sleeve and the inner tube, the lower end ring can be locked by the cooperation of the retaining ring and the retaining groove, thereby restricting the movement of the locking sleeve.

[0013] In one embodiment, a meshing toothed ring is provided on the outer side of the expansion portion, and a corresponding meshing toothed ring is provided on the inner side of the slot.

[0014] Compared with the prior art, the present application has the following advantages.

[0015] The fixed cylinder of this invention is pre-installed inside the well casing. Then, the inner tube and various components mounted on the inner tube are pumped into the fixed cylinder to seal the well casing. When it is necessary to unseal the casing, a greater pumping pressure is applied, which pushes the high-pressure glass against the shear pin sleeve, causing the high-pressure glass to break and the well casing to be unsealed without adversely affecting subsequent work.

[0016] Furthermore, the various components on the inner tube of this invention employ a stepped operating method. First, under the pressure of the pump, the spring sleeve engages with the slot. Then, by increasing the pump pressure, the locking sleeve, under the pressure of the pump, locks the spring sleeve in place, while the lower ring cooperates with the retaining spring to fix the locking sleeve in place. This method is simple to operate, provides rapid sealing, and solves problems such as well-killing fluid loss, potential well kicks, and difficulties in continuing subsequent work that exist in existing well-killing operations. Attached Figure Description

[0017] The present invention will now be described with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of one embodiment of the non-pressure well plugging device according to the present invention is shown;

[0019] Figure 2 The invention is shown Figure 1 An enlarged structural diagram of the locking sleeve portion;

[0020] Figure 3 The invention is shown Figure 1 An enlarged structural diagram of the spring sleeve portion;

[0021] Figure 4 A three-dimensional structural schematic diagram of the spring sleeve according to the present invention is shown;

[0022] Figure 5 A schematic diagram of the structure of the clipper sleeve according to the present invention is shown.

[0023] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0024] The invention will now be described with reference to the accompanying drawings.

[0025] In this application, it should be noted that the side on which the pumping pressure is applied according to the present invention is described as "upper," "front end," or similar terms, that is, Figure 1 The left side of the middle. And Figure 1 The right-hand direction is described as "down", "back end" or similar terms.

[0026] Figure 1 The structure of the sealing device 100 according to the present invention is shown. For example... Figure 1 As shown, the sealing device 100 includes a fixed cylinder 1, an inner tube 2, high-pressure glass 3, and a shear pin sleeve 4. The outer diameter of the inner tube 2 is smaller than the inner diameter of the fixed cylinder 1, and a sealing element 21 for sealing connection with the fixed cylinder 1 is provided on the outer wall of the inner tube 2. Through this arrangement, the inner tube 2 can enter the fixed cylinder 1 and form a sealing structure. In this embodiment, a spring sleeve 22 is also fixedly provided on the outer wall of the inner tube 2, and a groove 11 is provided on the inner wall of the fixed cylinder 1. The working principle of the spring sleeve 22 is as follows: First, the spring sleeve 22 is compressed, and the inner tube 2 is... Figure 1The high-pressure glass 3 is inserted into the fixed cylinder 1 with the side facing downwards. At this time, pressure is pumped downwards to the upper part of the fixed tube 2. The inner tube 2 with spring sleeve 22 enters from the front end of the fixed cylinder 1. The spring sleeve 22, in a compressed state, enters the fixed cylinder 1 along with the inner tube 2. Then, the spring sleeve 22 reaches the position of the slot 11, its outer diameter expands, and it is locked in the slot 11. Figure 1 The position shown indicates that the inner tube 2 is secured inside the fixed cylinder 1, thus completing the sealing of the oil and gas well.

[0027] In this embodiment, the high-pressure glass 3 and the shear pin sleeve 4 are disposed inside the inner tube 2, with the shear pin sleeve 4 positioned below the high-pressure glass. A sliding sleeve 31 is also provided between the high-pressure glass 3 and the inner tube 2. The sliding sleeve 31 is sealed to the inner tube 2; it is fixedly connected to the shear pin sleeve 4 via a shear pin and can slide along the inner tube 2 after the shear pin is cut; the sliding sleeve 31 is fixedly sealed to the high-pressure glass 3. The shear pin sleeve 4 includes a fixing part 41 and a breaking tooth 42. Figure 1 As shown, the fixing part 41 is fixedly connected to the inner tube 2, and there is a certain distance between the fixing part 41 and the sliding sleeve 32, so that the sliding sleeve 31 can move downward relative to the shear pin sleeve 4; the outer diameter of the breaking tooth 42 is smaller than the outer diameter of the fixing part 41, and it extends into the sliding sleeve 31, with a distance between the breaking tooth 42 and the high-pressure glass 3. Through this arrangement, on the one hand, the high-pressure glass 3 can play a sealing role. On the other hand, when it is necessary to release the seal, the pumping pressure is increased. Under the action of pressure, the shear pin between the sliding sleeve 31 and the shear pin sleeve 4 is sheared, and the high-pressure glass 3 and the sliding sleeve 31 move downward under the action of pressure, so that the high-pressure glass 3 collides with the shear pin sleeve 4, and finally the high-pressure glass 3 is broken by the action of the breaking tooth 42, thus releasing the wellbore seal.

[0028] It is easy to understand that the fixed cylinder 1 needs to be pre-fixed to the inner wall of the wellbore. The fixed cylinder 1 and the inner wall of the wellbore are connected in a sealed manner. This sealed connection method is existing technology and will not be described in detail here. The shearing pressure of the shear pin between the sliding sleeve 31 and the inner tube 2 is insufficient to compress the spring sleeve 22. Therefore, during the above-mentioned working process, from the moment the spring sleeve 22 and the slot 11 are engaged, the inner tube 2 and the fixed cylinder 1 are always in an engaged state.

[0029] In a preferred embodiment, a limiting surface 311 and a limiting ring 312 are provided on the inner wall of the sliding sleeve 31, with the high-pressure glass 3 located between the limiting surface 311 and the limiting ring 312. The limiting ring 312 is fixedly connected to the sliding sleeve 31 by bolts (not shown) or other detachable means. This arrangement allows the limiting ring 312 to engage with the limiting surface 311, securing the high-pressure glass 3 within the sliding sleeve 31. Furthermore, it facilitates the machining and installation of the components.

[0030] like Figure 3 and Figure 4 As shown, in one specific embodiment, the spring sleeve 22 includes a sliding portion 221, an expansion portion 222, and a fitting portion 223 connected sequentially from left to right. In its natural state, the outer diameter of the expansion portion 222 is larger than the outer diameters of the sliding portion 221 and the fitting portion 223. This arrangement allows the expansion portion 222 to engage with the slot 11.

[0031] In a preferred embodiment, a toothed ring (not shown in the figure) is provided on the outer wall of the expansion portion 222, and a toothed ring (not shown in the figure) is also provided on the inner wall of the groove 11. The toothed rings of the expansion portion 222 and the toothed rings of the groove 11 can mesh with each other. This arrangement prevents the inner tube 2 from moving relative to the fixed cylinder 1, thus improving stability. The toothed rings can be mating threads or multiple sets of spaced-apart annular protrusions.

[0032] like Figure 1 As shown, in a preferred embodiment, there are two seals 21, spaced apart on the inner tube 2, with a spring sleeve 22 located between the two seals 21. A locking sleeve 23 is provided on the outside of the inner tube 2 via a shear pin (not shown), and the locking sleeve 23 is also located between the two seals 21. A groove is provided on the inner wall of the locking sleeve 23, forming an annular cavity 231 with the inner tube 2. Furthermore, the area of ​​the front end face 232 of the annular cavity 231 is larger than the area of ​​the rear end face 233. A through hole 12 is also provided on the wall of the inner tube 2, communicating between the annular cavity 231 and the interior of the inner tube 2. The working principle of the locking sleeve 23 is as follows: After the spring sleeve 22 is engaged in the slot 11, the pumping pressure is increased, and the pressure is transmitted from the through hole 12 to the annular cavity 231. Since the area of ​​the front end face 232 of the annular cavity 231 is larger than the area of ​​the rear end face 232, under the condition that the pressure in the annular cavity 231 is equal, the front end face 232 is subjected to a greater force than the rear end face 232, thereby cutting off the shear pin between the locking sleeve 23 and the inner tube, pushing the locking sleeve 23 towards the spring sleeve 22, and pushing the locking sleeve 23 into the gap between the expansion part 222 of the spring sleeve 22 and the inner tube. In this embodiment, as... Figure 3 As shown, the inner diameters of the sliding part 221, the expansion part 222, and the fitting part 223 of the spring sleeve 22 are all equal (the cross-sectional part of the spring sleeve 22 in the figure represents the sliding part 221, and the uncross-sectional parts represent the expansion part 222 and the fitting part 223). In this way, the expansion part 222 is prevented from contracting inward, thereby locking the spring sleeve 22 and ensuring that the inner tube 2 does not detach from the fixed cylinder 1.

[0033] It is easy to understand that the breaking pressure of the shear pin between the shear pin sleeve 4 and the sliding sleeve 31 is greater than the breaking pressure of the shear pin between the locking sleeve 23 and the inner tube 2.

[0034] In a preferred embodiment, a lower end ring 24 is also provided at the lower end of the locking sleeve 23. A retaining ring 25 is also provided on the outer wall of the inner tube 2. In the initial state, the retaining ring 25 is compressed within the inner tube 2 wall by the lower end ring 24. With this arrangement, when the locking sleeve 23 moves towards the spring sleeve 22, the lower end ring 24 moves along with the locking sleeve 23. When the locking sleeve 23 moves to the gap between the expansion portion 222 and the inner tube 2, the retaining ring 25 engages in the groove on the inner wall of the lower end ring 24, thus preventing both the lower end ring 24 and the locking sleeve 23 from moving and ensuring that the locking sleeve 23 does not return to its initial position.

[0035] In a preferred embodiment, a cable (not shown in the figure) is connected to the inner tube 2. The cable is preferably located on the upper end face or inner wall of the inner tube 2 to prevent interference with its operation. By using the cable, the travel distance of the cable can provide feedback on whether the invention has reached the designated position.

[0036] In a preferred embodiment, a large rubber cup 26 is also provided on the outer wall of the inner tube 2. In this embodiment, the large rubber cup 26 is located below the sealing member 21. By providing the large rubber cup 26, the sealing performance of the inner tube 2 and the fixed cylinder 1 can be further improved, ensuring smooth pumping and facilitating pumping.

[0037] In one specific embodiment, the pumping method of the present invention employs a pneumatic pump or a hydraulic pump.

[0038] This invention employs a non-killing wellbore sealing method. High-pressure glass 3 is used to seal the wellbore via a pumped inner tube 2, effectively avoiding the adverse effects of using kill fluid. Furthermore, simply increasing the pumping pressure causes the high-pressure glass 3 to impact and break against the shear sleeve 4, releasing the seal. This method is convenient and allows for rapid sealing and unsealing, improving work efficiency.

[0039] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-pressure well plugging device, characterized in that, include: A fixed cylinder (1) is used to fix the well casing inside the well. The inner tube (2) can be sealed and snapped into the inside of the fixed cylinder; A high-pressure glass (3) sealed inside the inner tube (2); and A shear pin sleeve (4) is fixedly installed on the inner wall of the inner tube (2); The clipper sleeve (4) is located downstream of the high-pressure glass (3), and the high-pressure glass (3) is configured to break upon impact with the clipper sleeve (4) under pressure. The fixed cylinder is pre-installed inside the well casing. The inner tube, the high-pressure glass (3) installed on the inner tube, and the shear pin sleeve (4) are pumped into the fixed cylinder, so that the inner tube is sealed and clamped inside the fixed cylinder, thus completing the sealing of the well casing.

2. The non-pressure well plugging device according to claim 1, characterized in that, A sliding sleeve (31) is sealed inside the inner tube (2), and the high-pressure glass (3) is sealed and fixed inside the sliding sleeve (31). The sliding sleeve (31) is connected to the shear pin sleeve (4) by shear pins.

3. The non-pressure well plugging device according to claim 2, characterized in that, The shearing sleeve (4) includes a fixing part (41) and a breaking tooth (42). The outer diameter of the breaking tooth (42) is smaller than the outer diameter of the fixing part (41). The fixing part (41) is fixedly connected to the inner tube (2). The breaking tooth (42) extends into the sliding sleeve (31).

4. The non-pressure well plugging device according to claim 3, characterized in that, The fixing part (41) is axially spaced from the sliding sleeve (31), and the breaking tooth (42) is axially spaced from the high-pressure glass (3), which provides space for the high-pressure glass (3) to hit the shear sleeve (4).

5. The non-pressure well plugging device according to claim 4, characterized in that, A sealing element (21) and a large rubber cup (26) are provided on the outside of the inner tube (2) for sealing connection with the fixed cylinder (1).

6. The non-pressure well plugging device according to claim 5, characterized in that, A spring sleeve (22) is fixedly installed on the outside of the inner tube (2). The spring sleeve (22) includes a sliding part (221), an expansion part (222), and a fitting part (223) connected in sequence. In the natural state, the outer diameter of the expansion part (222) is larger than the outer diameter of the sliding part (221) and the fitting part (223). A groove (11) is provided on the inner wall of the fixed cylinder (1) to cooperate with the expansion part (222) of the spring sleeve (22).

7. The non-pressure well plugging device according to claim 6, characterized in that, A locking sleeve (23) is also provided on the outside of the inner tube (2). The locking sleeve (23) is configured such that when the spring sleeve (22) is engaged with the slot (11), the locking sleeve (23) can move under pressure to the annular space between the spring sleeve (22) and the inner tube (2), thereby preventing the expansion part (222) of the spring sleeve (22) from contracting and moving out of the slot (11).

8. The non-pressure well plugging device according to claim 7, characterized in that, Two sets of sealing elements (21) are provided. The spring sleeve (22) and the locking sleeve (23) are provided between the two sets of sealing elements (21). The inner side of the locking sleeve (23) is provided with a groove to form an annular cavity (231) with the inner tube (2). The inner tube (2) is provided with a through hole (12) communicating with the annular cavity (231). The area of ​​the annular cavity (231) close to the end face of the spring sleeve (22) along the axial direction is greater than the area of ​​the annular cavity (231) away from the spring sleeve (22) along the axial direction.

9. The non-pressure well plugging device according to claim 8, characterized in that, A retaining ring (25) is provided on the outer wall of the inner tube (2), and a lower end ring (24) including a retaining groove is provided at the end of the locking sleeve (23) away from the spring sleeve (22). The lower end ring (24) is configured such that when the locking sleeve (23) moves between the spring sleeve (22) and the inner tube, the lower end ring (24) can be locked by the cooperation of the retaining ring (25) and the retaining groove, thereby restricting the movement of the locking sleeve (23).

10. The non-pressure well plugging device according to claim 9, characterized in that, A biting tooth ring is provided on the outer side of the expansion part (222), and a corresponding biting tooth ring is provided on the inner side of the slot (11).

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