Ball seat with soluble shearing disc, spiral slip ball seat assembly and setting assembly

Abstract

The embodiment of the invention discloses a ball seat with a soluble shear disc, a spiral slip ball seat assembly and a setting assembly, other substances cannot remain in an oil well pipeline, the influence on oil well exploitation is reduced, the shear disc can be fixedly installed on the ball seat, and installation is more convenient and simpler. One side of a spiral slip bowl is connected with a lower connector, the other side of the spiral slip bowl is connected with a sealing piece, a central pipe is arranged on one side of the spiral slip bowl and makes contact with the spiral slip bowl, the central pipe is matched with the spiral slip bowl to form an expansion sleeve structure, and the expansion sleeve structure is connected with the lower connector. The lower connector is provided with an open groove, the soluble shearing disc is installed in the open groove, and the expansion sleeve structure is used for anchoring the ball seat in an oil well pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of vertical wells in oil fields, and in particular to a ball seat with a soluble shear disc, a spiral slip ball seat assembly and a sealing assembly. Background Art

[0002] The ball seat or bridge plug used in the fracturing process, after being seated, currently generally uses shear pins to control the release force, thereby achieving the purpose of release.

[0003] However, shear pins are made of non-soluble materials. After the ball seat downhole dissolves, a large number of shear pins will remain downhole, which may affect the subsequent oil well production. At the same time, since the installation method of shear pins and soluble ball seats is relatively cumbersome, each ball seat needs to be installed with multiple shear pins, which is time-consuming in on-site operations and increases the risk of installation. Summary of the invention

[0004] The present application provides a ball seat, a spiral slip ball seat assembly and a sealing assembly with a soluble shear disc. The shear disc used is soluble. When the soluble shear disc is sheared in the oil well pipeline, the soluble shear disc and the ball seat remaining in the oil well pipeline will dissolve, so that no other substances will remain in the oil well pipeline, reducing the impact on oil well production. The shear disc can be installed and fixed on the ball seat, which is more convenient and simple to install.

[0005] In a first aspect, the present application provides a ball seat with a soluble shear disc, comprising: a center pipe, a spiral slip seat, a lower joint, a seal, and a soluble shear disc; The soluble shear disk is provided with an opening, one side of the spiral cava seat is connected to the lower joint, and the other side of the spiral cava seat is connected to the seal, the center tube is provided on one side of the spiral cava seat and contacts the spiral cava seat, the center tube cooperates with the spiral cava seat to form an expansion sleeve structure, the lower joint is provided with a groove, the soluble shear disk is installed in the groove, and the expansion sleeve structure is used to anchor the ball seat in the oil well pipeline.

[0006] Optionally, the thickness of the soluble shear disk is set to a preset value.

[0007] Optionally, the soluble shearing disk is provided with a plurality of evenly distributed notches, and the notches penetrate the outer side surface of the soluble shearing disk.

[0008] Optionally, the outer surface of the central tube is arranged as a slope structure, the high point of the slope structure is arranged at an end away from the spiral slip seat, and the low point of the slope structure is arranged at an end close to the spiral slip seat.

[0009] Optionally, the spiral cava seat is connected to the lower joint in a detachable manner, a through hole is provided on the lower joint, the through hole is connected to the groove, and the cross-sectional area of ​​the groove is larger than the cross-sectional area of ​​the through hole.

[0010] Optionally, the aperture of the opening is set to a preset value, and when the soluble shear disc is mounted on the slot, the center line of the opening and the center line of the through hole are set on the same straight line.

[0011] Optionally, the outer surface of the soluble shear disk is sprayed with anti-solvent paint.

[0012] Optionally, the soluble shear disc is installed in the slot by bonding or threading.

[0013] A second aspect of the present application provides a spiral slip ball seat assembly, comprising a release lever and a ball seat with a soluble shear disc as described in the first aspect and any one of the first aspects; One end of the release lever is provided with an external thread, and the soluble shear disc in the ball seat is provided with an internal thread, and the release lever is threadedly connected with the internal thread on the soluble shear disc through the external thread.

[0014] The third aspect of the present application provides a sealing assembly, which includes a sealing tool and a spiral cava ball seat assembly as described in the second aspect and any one of the second aspects, the sealing tool being detachably connected to the spiral cava ball seat assembly, and the sealing tool being used to push the center pipe on the spiral cava ball seat assembly into the spiral cava seat to achieve sealing of the ball seat and the inner wall of the wellbore.

[0015] A fourth aspect of the present application provides a spiral slip ball seat assembly, comprising a release lever, a connection assembly, and a ball seat with a soluble shear disc as described in the first aspect and any one of the first aspects; The first end of the release lever passes through the ball seat, and the connecting assembly is installed at one end of the release lever, and the connecting assembly is used to fix the soluble shear disc on the ball seat.

[0016] Optionally, an external thread is provided on the first end of the release lever, and the connecting assembly includes a shear nut and an anti-retraction nut, both of which are mounted on the external thread of the first end of the release lever, the shear nut is tightly attached to one side of the soluble shear disk, and the anti-retraction nut is tightly attached to the shear nut.

[0017] Optionally, a hole is provided on the first end of the release lever, the hole passes through the release lever and is provided on one side of the external thread, and a cotter pin is detachably mounted at the hole.

[0018] The fifth aspect of the present application provides a sealing assembly, which includes a sealing tool and a spiral cava ball seat assembly as described in the fourth aspect and any one of the fourth aspects, the sealing tool being detachably connected to the spiral cava ball seat assembly, and the sealing tool being used to push the center pipe on the spiral cava ball seat assembly into the spiral cava seat to achieve sealing of the ball seat and the inner wall of the wellbore.

[0019] It can be seen from the above technical solutions that this application has the following advantages: 1. The ball seat with the soluble shear disc is connected to the release lever to form a release mechanism. When the release operation is performed, the release mechanism can provide a release force to control the release lever through the soluble shear disc, and each component is a soluble component, so there is no non-soluble component remaining in the well, reducing the impact on oil well production.

[0020] 2. Compared with the shear pin method, the connection method of the soluble shear disc and the release lever is more convenient to install.

[0021] 3. The installation of shear pins is prone to improper installation, which affects the release force. The present application adopts a combination of shear pins, soluble shear discs and release levers, which will avoid improper installation and make installation more convenient.

[0022] 4. When using the shear pin connection method, it is necessary to open multiple pin holes on the release lever. The opening of multiple pin holes will reduce the strength of the release lever. In the present application, there is no need to open holes on the release lever, thereby improving the strength of the release lever. Compared with the shear pin, the use of the soluble shear disc can reduce the loss of the release lever, effectively increase the service life of the release lever, reduce the probability of accidental breakage, better prevent accidents, and make the operation safer and more reliable.

[0023] 5. Compared with the shear pin method, the present application adopts a soluble shear disc method. By adjusting the thickness of the soluble shear disc and the outer diameter of the shear nut, the shear force can be flexibly adjusted, which makes the regulation of the shear force more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of the ball seat with a soluble shear disc of the present application; Figure 2 for Figure 1 Cross-sectional view of the AA section; Figure 3 Another schematic diagram of the three-dimensional structure of the ball seat with a soluble shear disc of the present application; Figure 4 This is a schematic diagram of the overall structure of the spiral slip ball seat assembly of the present application; Figure 5This is a schematic diagram of the cross-sectional structure of the spiral slip ball seat assembly of the present application; Figure 6 It is a front schematic diagram of the overall structure of the setting assembly of this application; Figure 7 A schematic diagram of a cross-sectional structure of the sealing assembly of this application; Figure 8 Another overall structural schematic diagram of the spiral slip ball seat assembly of the present application; Fig. 9 for Figure 8 Cross-sectional view of the middle BB part; Fig.10 This is a schematic diagram of the three-dimensional structure of the soluble shear disc in the ball seat with the soluble shear disc of the present application; Fig.11 A cross-sectional view of a soluble shear disc in a ball seat with a soluble shear disc of the present application; Fig.12 This is a schematic diagram of the three-dimensional structure of a soluble shear disc with a notch in a ball seat with a soluble shear disc of the present application; Fig.13 Another schematic diagram of the overall structure of the setting assembly of the present application is shown in FIG. Fig.14 This is another schematic front view of the overall structure of the setting assembly of this application; Fig.15 Another cross-sectional structural schematic diagram of the setting assembly of this application; In the figure: 1. release lever; 2. center tube; 3. seal; 4. spiral slip seat; 5. lower joint; 6. soluble shear disc; 7. accommodation area; 8. connection assembly; 81. shear nut; 82. anti-retraction nut; 9. cotter pin; 10. sealing tool. DETAILED DESCRIPTION

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Embodiment 1: See also Figures 1 to 4 , the first aspect of the present application provides a ball seat with a soluble shear disc, comprising: a central tube 2, a spiral slip seat 4, a lower joint 5, a seal 3 and a soluble shear disc 6; The soluble shear disk 6 is provided with an opening, one side of the spiral cava seat 4 is connected to the lower joint 5, and the other side of the spiral cava seat 4 is connected to the seal 3. The center pipe 2 is arranged on one side of the spiral cava seat 4 and contacts the spiral cava seat 4. The center pipe 2 cooperates with the spiral cava seat 4 to form an expansion sleeve structure. The lower joint 5 is provided with a groove, and the soluble shear disk 6 is installed in the groove; the expansion sleeve structure is used to anchor the ball seat in the oil well pipeline. When the soluble shear disk 6 is sheared in the oil well pipeline, the center pipe 2, the spiral cava seat 4, the lower joint 5, the seal 3 and the soluble shear disk 6 will fall into the oil well pipeline until they are completely dissolved in the oil well pipeline.

[0031] In the embodiment of the present application, the center pipe 2 and the spiral cava seat 4 are in a state of contact and abutment. Under the action of the external push cylinder, the center pipe 2 can be pushed toward the spiral cava seat 4, so that when the center pipe 2 and the spiral cava seat 4 accessories are connected, a combination forms an expansion sleeve structure, and the ball seat can be anchored in the oil well pipeline through the expansion sleeve structure.

[0032] A sealing member 3 is provided at one end of the spiral cava seat 4, and a lower joint 5 is provided at the other end of the spiral cava seat 4. The spiral cava seat 4 is connected to the lower joint 5 by screws or gluing. A slot is provided at the lower joint 5, and the slot does not penetrate the lower joint 5. The soluble shear disk 6 is adaptively installed in the slot, for example: by adhesion or threaded connection, when the expansion sleeve structure anchors the ball seat in the oil well pipeline, the soluble shear disk 6 will be sheared under the action of external force, and the soluble shear disk 6 and the ball seat remaining in the oil well pipeline will dissolve, so that no other substances will remain in the oil well pipeline, reducing the impact on oil well exploitation, and the soluble shear disk 6 can be installed and fixed on the ball seat, which is more convenient and simple to install.

[0033] Among them, it should be noted that the outer surface of the soluble shear disk 6 is sprayed with anti-solvent paint. Specifically, before the underground sealing, the soluble shear disk 6 is immersed in the underground for about 2-3 hours, and the material of the soluble shear disk 6 will be more or less dissolved, especially when the well condition is bad, the dissolution will be more serious. After the soluble shear disk 6 is dissolved, it will affect the shear force, that is, it will cause the release force to decrease. Therefore, in order to improve this effect, the anti-solvent paint can be sprayed on the outer surface of the soluble shear disk 6 to prevent the soluble shear disk 6 from dissolving prematurely, thereby stabilizing the release force.

[0034] In practical applications, after the soluble shear disc 6 and the lower joint 5 are installed, the ball seat can be transported to the oil well pipeline under the action of an external device. At this time, a release lever 1 will be installed in the ball seat, which passes through the opening on the soluble shear disc 6 and is connected to the ball seat. After the ball seat is transported to the set position, the external push cylinder will push the central tube 2 to move toward the spiral slip seat 4. The outer surface of the central tube 2 is set as a ramp structure, the high point of the ramp structure is set at the end away from the spiral slip seat 4, and the low point of the ramp structure is set at the end close to the spiral slip seat 4. The spiral slip seat 4 is provided with a accommodating area 7 inside, and the accommodating area 7 is inclined with the outer surface of the central tube 2. The slope structure on the surface is adapted, that is, when the central tube 2 moves toward the accommodating area 7 on the spiral slip seat 4, the low point of the slope structure on the central tube 2 contacts the low point position in the accommodating area 7, and the high point of the slope structure on the central tube 2 contacts the high point position in the accommodating area 7. During the movement of the central tube 2, the position of the release lever 1 will not move and is in a fixed state. The central tube 2 and the release lever 1 are in a state of relative motion. When the central tube 2 is pushed into the accommodating area 7 by the external push cylinder and overlaps with the accommodating area 7, an expansion sleeve structure is formed between the central tube 2 and the spiral slip seat 4, and the expansion sleeve structure can anchor the ball seat in the oil well pipeline.

[0035] After the ball seat is anchored in the oil well pipeline, an external force pulls the release lever 1, and the pulling force acts on the soluble shear disk 6, so that the soluble shear disk 6 is sheared. At this time, the center pipe 2, the spiral cava seat 4, the lower joint 5, the seal 3 and the sheared soluble shear disk 6 will fall into the oil well pipeline. After standing in the oil well pipeline for a period of time, the center pipe 2, the spiral cava seat 4, the lower joint 5, the seal 3 and the sheared soluble shear disk 6 that have fallen into the oil well pipeline will dissolve. Therefore, after the ball seat and the soluble shear disk 6 are dissolved in the oil well pipeline, no other substances will remain in the oil well pipeline, reducing the impact on oil well exploitation.

[0036] It should be noted that the soluble shear disc 6 can ensure the stability of the release force, that is, the force that can pull through the soluble shear disc 6, and this force is limited to a maximum value. The parameters that determine the magnitude of this force are the material properties of the soluble shear disc 6 and the thickness of the soluble shear disc 6. Therefore, the magnitude of the release force can be adjusted by adjusting the thickness of the soluble shear disc 6. The greater the thickness, the greater the release force provided. Within the maximum allowable range, the greater the force that can be provided, the better.

[0037] The existing release mechanism needs to use a large number of shear screws to achieve a large release force, and the shear screws dropped into the oil well pipeline cannot be dissolved. However, the soluble shear disc 6 of the present application can be sheared in a full circle under the action of the release force, and the shearing area of ​​the soluble shear disc 6 is large, so that the thinner thickness of the soluble shear disc 6 can achieve a larger shear force. Within the maximum allowable range, the greater the thickness of the soluble shear disc 6, the greater the shear force that can be achieved. Therefore, compared with the existing release method of shear pins, the soluble shear disc 6 used in the present application can achieve full circle cutting, and the thinner thickness of the soluble shear disc 6 can achieve a larger release force. After the shearing is completed, the soluble shear disc 6 can be completely dissolved after standing in the oil well pipeline for a period of time, thereby facilitating the subsequent exploitation of the oil well.

[0038] Among them, a number of evenly distributed grooves are arranged on the soluble shear disk 6, and the grooves penetrate the outer surface of the soluble shear disk 6, so that when the soluble shear disk 6 is sheared under the action of the throwing force, the soluble shear disk 6 will break. Specifically, the breakage occurs at the connection between the grooves or the weaker part of the connection, and the breakage will be dispersed into multiple pieces, thereby making it more conducive to the dissolution of the soluble shear disk 6 in the oil well pipeline and the dissolution speed is faster.

[0039] Optionally, the spiral cava seat 4 is connected to the lower joint 5 in a detachable manner, and the lower joint 5 is provided with a through hole and a slot, the through hole is connected to the slot, and the cross-sectional area of ​​the slot is larger than the cross-sectional area of ​​the through hole.

[0040] In this embodiment, the spiral slip seat 4 and the lower joint 5 are two parts, and the connection between the two is a detachable connection, for example: connected by screws, threads or other methods, which are not specifically limited here. A through hole and a slot are provided on the lower joint 5, wherein the through hole is connected to the slot, so that the through hole and the slot are combined to form a "T" structure, the cross-sectional area of ​​the slot is larger than the cross-sectional area of ​​the through hole, and the soluble shear disc 6 is placed in the slot.

[0041] The soluble shear disc 6 is provided with an opening. When the soluble shear disc 6 is installed on the slot, the center line of the opening and the center line of the through hole are arranged on the same straight line.

[0042] It should be noted that the conventional connection method using shear pins requires opening a plurality of pin holes on the release lever. The opening of a plurality of pin holes will damage the structure of the release lever 1, thereby reducing the strength of the release lever 1 and causing a certain impact on the subsequent release operation. In the present application, there is no need to open holes on the release lever 1. By combining the shear pins and the soluble shear disc 6, the release lever and the ball seat can be connected and fixed, thereby improving the strength of the release lever 1 and making the operation safer and more reliable.

[0043] See also Figure 5 The second aspect of the present application provides a spiral cava ball seat assembly, including a release lever and a ball seat with a soluble shear disc as described in the first aspect and any one of the first aspects; an external thread is provided at one end of the release lever, and an internal thread is provided on the soluble shear disc in the ball seat, and the release lever is threadedly connected to the internal thread on the soluble shear disc via the external thread. Specifically, the release lever is connected to the soluble shear disc detachably connected to the ball seat via threads, and when shearing is performed, the internal and external threads are squeezed against each other by pulling the release lever, and when the release force applied by the release lever is large enough, the release lever can be pulled out of the soluble shear disc to achieve shearing of the soluble shear disc.

[0044] See also Figure 6 to Figure 7 The third aspect of the present application provides a sealing assembly, which includes a sealing tool 10 and a spiral cava ball seat assembly as described in the second aspect and any one of the second aspects, the sealing tool 10 is detachably connected to the spiral cava ball seat assembly, and the sealing tool 10 is used to push the center pipe 2 on the spiral cava ball seat assembly into the spiral cava seat 4 to achieve sealing between the ball seat and the inner wall of the wellbore.

[0045] Specifically, the spiral slip ball seat assembly and the sealing tool 10 are connected. Since the spiral slip ball seat assembly and the sealing tool 10 are detachably connected, they are easy to assemble and connect, and are disposable and maintenance-free, so they are convenient to use.

[0046] After the connection is completed, the spiral cava ball seat assembly and the sealing tool are sent into the well to the set position. When they reach the set position in the well, the explosive is detonated by the detonator to generate high-pressure gas. The high-pressure gas enters the sealing chamber through the air guide channel in the sealing tool, and then pushes the center tube 2 on the spiral cava ball seat assembly into the spiral cava seat 4 to achieve the sealing of the ball seat and the inner wall of the wellbore.

[0047] Embodiment 2: See also Figures 8 to 12 The fourth aspect of the present application provides a spiral cava ball seat assembly, comprising a release lever 1, a connecting assembly 8 and a ball seat with a soluble shear disc 6 as described in the first aspect and any embodiment of the first aspect; the release lever 1 passes through the ball seat, the connecting assembly 8 is installed on the release lever 1, and the connecting assembly 8 is used to fix the soluble shear disc 6 on the ball seat.

[0048] Among them, an external thread is set on the first end of the release lever 1, and the connecting assembly 8 includes a shear nut 81 and an anti-retraction nut 82. The first end of the release lever 1 passes through the ball seat, and the shear nut 81 and the anti-retraction nut 82 are both installed on the external thread of the first end of the release lever 1. The shear nut 81 is tightly attached to one side of the soluble shear disk 6, and the anti-retraction nut 82 is tightly attached to the shear nut 81.

[0049] In the embodiment of the present application, the first end of the release lever 1 is an end that passes through the soluble shear disc 6, and the second end of the release lever 1 is an end connected to an external device, wherein the cross-sectional area of ​​the first end of the release lever 1 is smaller than the cross-sectional area of ​​the second end of the release lever 1, and an external thread is provided on the first end of the release lever 1, and the connecting assembly 8 includes a shear nut 81 and an anti-retraction nut 82, and the shear nut 81 and the anti-retraction nut 82 are both installed on the external thread of the first end of the release lever 1, and the shear nut 81 is closely attached to one side of the soluble shear disc 6, and the anti-retraction nut 82 is closely attached to the shear nut 81, and the ball seat of the soluble shear disc 6 and the release lever 1 are connected in the following two ways, which are now introduced respectively: 1. The soluble shear disc 6 is first installed on the release lever 1, and then the shear nut 81, the anti-retraction nut 82 and the cotter pin 9 are tightened in sequence to form a release lever assembly. Then the spiral slip seat 4 is installed and placed on the release lever 1 in sequence, so that the soluble shear disc 6 is placed in the groove of the lower joint 5, and then the center pipe 2 is set on one side of the spiral slip seat 4 to form a spiral slip ball seat assembly as a whole.

[0050] 2. The soluble shear disc 6 is installed in the slot of the lower joint 5 to form a soluble shear disc ball seat, and then the release lever 1 is installed. The release lever 1 passes through the central tube 2, the spiral slip seat 4 and the lower joint 5, and passes through the soluble shear disc 6. Then the shear nut 81, the anti-retraction nut 82, and the cotter pin 9 are installed in sequence to form a spiral slip ball seat assembly as a whole.

[0051] The cross-sectional areas of the first end of the release lever 1 , the shear nut 81 and the anti-retraction nut 82 are all smaller than the cross-sectional area of ​​the through hole.

[0052] In the embodiment of the present application, in order to facilitate the release lever 1 to be pulled out from the lower joint 5, the spiral slip seat 4 and the center pipe 2 during the release operation, the cross-sectional areas of the first end of the release lever 1, the shear nut 81 and the anti-retraction nut 82 are all set to be smaller than the cross-sectional area of ​​the through hole, so that when the external device pulls the second end of the release lever 1, the first end of the release lever 1 passes through the soluble shear disk 6, and then passes through the through hole of the lower joint 5, the spiral slip seat 4 and the center pipe 2 in sequence and is pulled out. At this time, the center pipe 2, the spiral slip seat 4, the seal 3, the lower joint 5 and the soluble shear disk 6 will be left in the oil well pipeline. These components are all soluble parts and can dissolve by themselves in the oil well pipeline.

[0053] Optionally, a hole is provided on the first end of the release lever 1, the hole passes through the release lever 1 and is provided on one side of the external thread, and a cotter pin 9 is detachably installed at the hole, and the cotter pin 9 is used to fix the shear nut 81 and the anti-retraction nut 82 on the release lever 1 to prevent the shear nut 81 and the anti-retraction nut 82 from loosening and falling outward, thereby playing a protective role.

[0054] Embodiment three: See also Figures 13 to 15 In the fifth aspect of the present application, a sealing assembly is provided, which includes a sealing tool 10 and a spiral cava ball seat assembly as described in the second aspect and any embodiment of the second aspect, wherein the sealing tool 10 is detachably connected to the spiral cava ball seat assembly, and the sealing tool 10 is used to push the center pipe 2 on the spiral cava ball seat assembly into the spiral cava seat 4 to achieve sealing of the ball seat and the inner wall of the wellbore.

[0055] Specifically, the spiral slip ball seat assembly and the sealing tool 10 are connected. Since the spiral slip ball seat assembly and the sealing tool 10 are detachably connected, they are easy to assemble and connect, and are disposable and maintenance-free, so they are convenient to use.

[0056] After the connection is completed, the spiral cava ball seat assembly and the sealing tool 10 are sent into the well to the set position. When they reach the set position in the well, the explosive is detonated by the detonator to generate high-pressure gas. The high-pressure gas enters the sealing chamber through the air guide channel in the sealing tool 10, and then pushes the center tube 2 on the spiral cava ball seat assembly into the spiral cava seat 4 to achieve the sealing of the ball seat and the inner wall of the wellbore.

[0057] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ball seat with a soluble shear disc, characterized in that: include: Center pipe, spiral slip seat, lower joint, seal and soluble shear disc; The soluble shear disk is provided with an opening, one side of the spiral cava seat is connected to the lower joint, and the other side of the spiral cava seat is connected to the seal, the center tube is provided on one side of the spiral cava seat and contacts the spiral cava seat, the center tube cooperates with the spiral cava seat to form an expansion sleeve structure, the lower joint is provided with a groove, the soluble shear disk is installed in the groove, and the expansion sleeve structure is used to anchor the ball seat in the oil well pipeline.

2. The ball seat with soluble shear disc according to claim 1, characterized in that: The thickness of the soluble shear disc is set to a preset value.

3. The ball seat with soluble shear disc according to claim 1, characterized in that: The soluble shearing disk is provided with a plurality of evenly distributed notches, and the notches penetrate the outer side surface of the soluble shearing disk.

4. The ball seat with soluble shear disc according to claim 1, characterized in that: The outer surface of the central tube is arranged as a slope structure, the high point of the slope structure is arranged at an end away from the spiral slip seat, and the low point of the slope structure is arranged at an end close to the spiral slip seat.

5. The ball seat with soluble shear disc according to claim 1, characterized in that: The spiral slip seat is connected to the lower joint in a detachable manner. A through hole is provided on the lower joint. The through hole is connected to the slot, and the cross-sectional area of ​​the slot is larger than the cross-sectional area of ​​the through hole.

6. The ball seat with soluble shear disc according to claim 5, characterized in that: The aperture of the opening is set to a preset value, and when the soluble shear disc is mounted on the slot, the center line of the opening and the center line of the through hole are arranged on the same straight line.

7. The ball seat with soluble shear disc according to claim 1, characterized in that: The outer surface of the soluble shear disc is sprayed with anti-solvent paint.

8. The ball seat with soluble shear disc according to claim 1, characterized in that: The soluble shear disc is installed in the slot by bonding or threading.

9. A spiral slip ball seat assembly, characterized in that: A ball seat with a soluble shear disc and a throw-away lever as claimed in any one of claims 1 to 8; One end of the release lever is provided with an external thread, and the soluble shear disc in the ball seat is provided with an internal thread, and the release lever is threadedly connected with the internal thread on the soluble shear disc through the external thread.

10. A setting assembly, characterized in that: The sealing assembly includes a sealing tool and the spiral cava ball seat assembly as described in claim 9, the sealing tool is detachably connected to the spiral cava ball seat assembly, and the sealing tool is used to push the center pipe on the spiral cava ball seat assembly into the spiral cava seat to achieve sealing of the ball seat and the inner wall of the wellbore.

11. A spiral slip ball seat assembly, characterized in that: The invention comprises a release lever, a connection assembly and a ball seat with a soluble shear disc as claimed in any one of claims 1 to 8; The first end of the release lever passes through the ball seat, and the connecting assembly is installed on the first end of the release lever, and the connecting assembly is used to fix the soluble shear disc on the ball seat.

12. The spiral slip ball seat assembly according to claim 11, characterized in that: An external thread is provided on the first end of the release lever, and the connecting assembly includes a shear nut and an anti-retraction nut, both of which are installed on the external thread of the first end of the release lever, the shear nut is tightly attached to one side of the soluble shear disc, and the anti-retraction nut is tightly attached to the shear nut.

13. The spiral slip ball seat assembly according to claim 12, characterized in that: An orifice is arranged on the first end of the release lever, the orifice passes through the release lever and is arranged on one side of the external thread, and a split pin is detachably mounted on the orifice.

14. A setting assembly, characterized in that: The sealing assembly includes a sealing tool and a spiral cava ball seat assembly as described in any one of claims 11 to 13, the sealing tool being detachably connected to the spiral cava ball seat assembly, and the sealing tool being used to push the center pipe on the spiral cava ball seat assembly into the spiral cava seat to achieve sealing of the ball seat and the inner wall of the wellbore.

Images