CN219910708U - Diameter-variable spiral sealing ring type soluble bridge plug and setting device - Google Patents

Abstract

The utility model provides a variable diameter spiral sealing ring type soluble bridge plug, which comprises a pressing piece, a clamping piece and a guide piece; the clamping piece comprises a soluble rubber cylinder, a variable-diameter spiral sealing ring and slips; the guide piece is arranged at one end of the slip, and the other end of the slip is connected with the pressing piece; the soluble rubber cylinder and the variable-diameter spiral sealing ring are sequentially sleeved outside the pressing piece along the direction from the slips to the slips, and two opposite surfaces of the variable-diameter spiral sealing ring are respectively clung to the soluble rubber cylinder and the slips; the utility model also provides a setting device. The annular width of the spiral surface of the variable-diameter spiral sealing ring is unchanged during setting, the spiral surfaces are mutually clung and only radially spirally spread, the whole thickness of the spread spiral sealing ring is uniform, the spread spiral sealing ring is not easy to break, and the soluble rubber cylinder can be protected while the sealing effect is achieved.

Description

Diameter-variable spiral sealing ring type soluble bridge plug and setting device

Technical Field

The utility model relates to the technical field of petroleum exploitation, in particular to a variable-diameter spiral seal ring type soluble bridge plug and a setting device.

Background

Fracturing is one of the core technologies for improving the yield of oil and gas wells, and drilling and plugging are needed to be carried out after fracturing by using drillable bridge plugs so as to carry out oil and gas exploitation, and have the defects of high cost, high well control risk and slow production. With the increase of the length of the horizontal section of the oil and gas well, the difficulty of drilling and plugging is increased, and the technical limitation is more obvious. The soluble bridge plug has the advantages of high strength, high pressure resistance, stable temperature resistance and the like, the soluble bridge plug is used for setting, the drilling and plugging operation is not needed after the fracturing construction is finished, the soluble bridge plug can be automatically dissolved in flowback fluid, the full-drift diameter exploitation of a shaft is realized, the time and the cost for drilling and grinding the bridge plug are saved, and the output of an oil-gas well is greatly improved.

In the prior art, the sealing ring composed of a plurality of groups of slit gaskets is used by the soluble bridge plug, and the sealing ring has uneven thickness after being spread, so that the soluble cylinder can not be spread to a preset sealing position synchronously and uniformly, thus the complete sealing can not be realized, and when the soluble bridge plug bears high pressure, the weak area of the sealing ring of the gasket group has the condition of being extruded by pressure, and the soluble cylinder is extruded from the extruded place, thus the sealing of the soluble cylinder is invalid. For example, referring to fig. 1 and 2, fig. 1 is a schematic structural view of a sealing ring formed by matching multiple sets of split washers in the prior art, and fig. 2 is a schematic structural view of a sealing ring formed by matching multiple sets of split washers in the prior art after being seated and spread. After the sealing rings formed by the matching of the plurality of groups of slit gaskets 100 are spread, gasket notches 101 are formed at the positions of the split sealing rings, and the situation that the sealing rings have uneven thickness can be caused.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a variable diameter spiral sealing ring type soluble bridge plug and a setting device.

The utility model discloses a variable diameter spiral sealing ring type soluble bridge plug, which comprises a pressing piece, a clamping piece and a guide piece; the clamping piece comprises a soluble rubber cylinder, a variable-diameter spiral sealing ring and slips; the guide piece is arranged at one end of the slip, and the other end of the slip is connected with the pressing piece; along keeping away from the slips towards being close to the direction of slips, soluble rubber barrel and variable diameter spiral sealing ring cover in proper order locate outside compressing tightly the piece, and the opposite two sides of variable diameter spiral sealing ring are hugged closely in soluble rubber barrel and slips respectively.

Preferably, the compression member comprises a cone; one end of the cone with a smaller end face is connected in the slip, the variable-diameter spiral sealing ring is sleeved outside the cone, and the inner diameter of the variable-diameter spiral sealing ring is gradually increased along the direction of the slip towards the cone.

Preferably, the cone is provided with a first insection, the first insection is annularly arranged on the outer wall of one end of the cone with a smaller end face, the inner wall of the slip close to one end of the cone is annularly provided with a second insection, and the first insection and the second insection are matched to form an anti-reversing structure.

Preferably, the variable diameter helical seal ring has a smooth surfaced helical surface.

Preferably, the number of variable diameter spiral seal rings is two; the two variable diameter spiral sealing rings are rotationally combined, and spiral surfaces of the two variable diameter spiral sealing rings are sequentially staggered and overlapped.

Preferably, the pitch of the variable diameter spiral seal ring is 1 to 10mm.

Preferably, the variable diameter spiral sealing ring type soluble bridge plug further comprises a rubber sleeve retainer ring; the rubber cylinder check ring is sleeved outside the pressing piece, and the rubber cylinder check ring cover is arranged on the end face of one end, far away from the variable-diameter spiral sealing ring, of the sol cylinder.

Preferably, the guide comprises a lead and a guide ramp; the leading head is clamped at one end of the slip, which is far away from the compacting piece; the guide inclined plane is arranged on the end face of the leading head, which is close to one end of the slip, the end face of the slip, which corresponds to one end of the guide inclined plane, is provided with a sliding surface, and the guide inclined plane is attached to the sliding surface and can slide relatively.

Preferably, the slip comprises a plurality of first cracks and a plurality of second cracks; the first cracks are formed from one end of the slip to the other end of the slip, a gap is formed between the first cracks and the other end of the slip, and a plurality of first cracks are sequentially arranged at intervals along the circumferential direction; the second cracks are formed from the other end of the slip towards one end of the slip, a gap is formed between the second cracks and one end of the slip, the second cracks are sequentially arranged at intervals along the circumferential direction, and the first cracks and the second cracks are sequentially staggered along the circumferential direction.

The utility model also discloses a setting device, which comprises a variable diameter spiral sealing ring type soluble bridge plug and an adapter main body; the adapter body comprises an adapter push cylinder, an adapter, an adapter pull rod and an adapter adjusting nut; the adapter pushing cylinder is arranged at one end of the pressing piece far away from the slips; one end of the adapter pull rod is connected with the guide piece, and the other end of the adapter pull rod extends along the axial direction of the slips and is positioned in the central hole of the setting device; the adapter is arranged at one end of the adapter pull rod, which is far away from the guide piece; the adapter adjusting nut is fixed on the outer wall of the adapter pull rod, which is close to the adapter through threads arranged in the adapter, and is connected with the pressing piece in a clamping way.

The utility model has the beneficial effects that: the annular width of the spiral surface is unchanged in the setting process through the variable-diameter spiral sealing ring, and the spiral surfaces are mutually clung to carry out radial spiral expansion, the overall thickness of the expansion is uniform after the expansion, the situation of disconnection does not occur, the sealing failure caused by the fact that the soluble rubber cylinder is embedded into a slip gap can be prevented, the effect of protecting the soluble rubber cylinder is achieved, and meanwhile the soluble rubber cylinder is synchronously and uniformly expanded to a preset sealing position in the setting process, so that complete sealing is realized. In addition, the variable diameter spiral sealing ring also has the function of sealing the annular space between the cone and the inner wall of the sleeve, and plays a role of double sealing together with the sol cylinder.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

FIG. 1 is a schematic structural view of a seal ring formed by a plurality of sets of split washers in the prior art;

FIG. 2 is a schematic diagram of a seal ring formed by a plurality of groups of slit gaskets in the prior art after being spread by a seal ring;

FIG. 3 is a schematic structural view of a variable diameter spiral seal ring type soluble bridge plug according to an embodiment;

the variable diameter helical seal ring type soluble bridge plug described in the embodiment of FIG. 4 is a cross-sectional view;

FIG. 5 is a schematic structural view of a single variable diameter spiral seal ring according to an embodiment;

FIG. 6 is a cross-sectional view of a single one of the variable diameter spiral seal rings in an embodiment;

FIG. 7 is a schematic view of the structure of two of the variable diameter spiral seal ring combinations according to the embodiments;

FIG. 8 is a cross-sectional view of two of the variable diameter helical seal rings of the embodiment;

FIG. 9 is a schematic structural view of a setting device including the variable diameter helical seal ring type soluble bridge plug in an embodiment;

fig. 10 is a schematic view of a setting device comprising the variable diameter helical seal ring type soluble bridge plug according to an embodiment after setting.

FIG. 11 is a schematic view of the cone according to the embodiment;

FIG. 12 is a schematic view of the structure of the leader according to the embodiment;

FIG. 13 is a schematic illustration of the construction of the slip according to the embodiment;

fig. 14 is another schematic view of the slip according to the embodiment.

Reference numerals:

1. a pressing member; 11. a set screw; 12. a cone; 121. a first insection; 2. a clamping piece; 21. a soluble glue cartridge; 22. variable diameter spiral seal ring; 221. spiral surface; 23. a slip; 231. a second insection; 232. a first slit; 233. a second slit; 234. a sliding surface; 235. slip holes; 3. a guide; 31. a leading head; 311. a guide slope; 32. shearing pins; 4. a rubber cylinder retainer ring; 5. an adapter body; 51. an adapter push tube; 52. an adapter; 53. an adapter tie rod; 54. an adapter adjustment nut; 6. a sleeve; 7. a soluble sphere; 100. a plurality of sets of slit washers; 101. gasket notch.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

For a further understanding of the present utility model, reference should be made to the following examples, which are set forth to illustrate, by way of illustration, the principles of the utility model.

Embodiment one:

referring to fig. 3, 4 and 5, fig. 3 is a schematic structural view of the variable diameter spiral seal ring type soluble bridge plug according to an embodiment, fig. 4 is a sectional view of the variable diameter spiral seal ring type soluble bridge plug according to an embodiment, and fig. 5 is a structural and sectional view of a single variable diameter spiral seal ring according to an embodiment. The variable diameter spiral seal ring type soluble bridge plug in the embodiment comprises a pressing piece 1, a clamping piece 2 and a guide piece 3. The clamping piece 2 comprises a soluble rubber cylinder 21, a variable-diameter spiral sealing ring 22 and slips 23. The guide member 3 is provided at one end of the slips 23, and the other end of the slips 23 is connected to the pressing member 1. Along the direction from the slips 23 to the slips 23, the soluble rubber barrel 21 and the variable diameter spiral sealing ring 22 are sequentially sleeved outside the pressing piece 1, and two opposite surfaces of the variable diameter spiral sealing ring 22 are respectively clung to the soluble rubber barrel 21 and the slips 23. The variable diameter spiral seal ring 22 has a spiral structure.

The variable diameter spiral seal ring 22 in the present embodiment has a spiral surface 221, and the variable diameter spiral seal ring 22 is specifically an integral spiral ring structure formed by screwing the spiral surface 221. Referring again to fig. 10, fig. 10 is a schematic view of the setting device of the present embodiment including the variable diameter spiral seal ring type soluble bridge plug, which is used in the casing 6. In the setting process, the pressing piece 1 presses along the axis of the clamping piece 2 towards the direction of the guide piece 3, the annular width of the spiral faces 221 of the variable-diameter spiral sealing rings 22 is unchanged, the spiral faces 221 are mutually clung and only radially spirally spread, a compact sealing surface is formed after the spiral faces 221 are gradually clung, the whole thickness of the spiral faces 221 is uniform after the variable-diameter spiral sealing rings 22 are spread, the situation that disconnection does not occur can be prevented, sealing failure is caused due to the fact that the soluble rubber barrels 21 are embedded into gaps of slips 23, the effect of protecting the soluble rubber barrels 21 is achieved, and meanwhile the soluble rubber barrels 21 are synchronously and uniformly spread to a preset sealing position in the setting process, so that complete sealing is achieved. And the annular area of the conical surfaces of the sleeve 6 and the compression piece 1 is sealed, and the double sealing effect is formed together with the soluble rubber barrel 21. In addition, after the variable diameter spiral sealing ring 22 is unfolded, the spiral surfaces 221 can uniformly distribute pressure, so that the requirement on manufacturing materials is reduced, the selection range of the manufacturing materials is enlarged, and the manufacturing cost is reduced.

Referring to fig. 3, 4, 5 and 6, fig. 6 is a cross-sectional view of a single said variable diameter spiral seal ring in an embodiment, preferably the compression member 1 comprises a cone 12. One end of the cone 12 with a smaller end face is connected in the slips 23, the variable diameter spiral sealing ring 22 is sleeved outside the cone 12, and the inner diameter of the variable diameter spiral sealing ring 22 gradually increases along the direction of the slips 23 towards the cone 12. Because the conical surface of the cone 12 presents a certain angle relative to the variable-diameter spiral sealing ring 22, the inner diameter of the variable-diameter spiral sealing ring 22 is designed to gradually increase from one end close to the slips 23 to one end close to the soluble rubber barrel 21, no gap exists between the inner diameter of the variable-diameter spiral sealing ring 22 and the conical surface of the cone 12, the fit is tighter, and the sealing effect of the variable-diameter spiral sealing ring 22 is enhanced.

Specifically, the cone 12 has a first insection 121, the first insection 121 is annularly arranged on the outer wall of one end of the cone 12 with a smaller end face, the inner wall of the slip 23 close to one end of the cone 12 is annularly provided with a second insection 231, the first insection 121 and the second insection 231 are matched to form an anti-inverted-tooth structure, and the cone 12 is ensured to be compressed only along the axis of the slip 23 towards the direction of the leading head 31, and displacement in the opposite direction does not occur. Along the direction from the slips 23 to the slips 23, the soluble rubber barrel 21 and the variable diameter spiral sealing ring 22 are sequentially sleeved outside the pressing piece 1, and two opposite surfaces of the variable diameter spiral sealing ring 22 are respectively clung to the soluble rubber barrel 21 and the slips 23.

Referring to fig. 3, 4, 11 and 13, fig. 11 is a schematic structural view of the cone according to the embodiment, and fig. 13 is a schematic structural view of the slip according to the embodiment, more preferably, the cone 12 has a first tooth pattern 121, the first tooth pattern 121 is annularly disposed on an outer wall of the end of the cone 12 having a smaller end surface, the slip 23 is annularly disposed on an inner wall of the end, which is close to the cone 12, with a second tooth pattern 231, and the first tooth pattern 121 and the second tooth pattern 231 cooperate to form an anti-back tooth structure. The inverted tooth preventing structure is formed by matching the insections of the cone 12 and the slips 23, so that the compression piece 1 is only compressed along the axis of the slips 23 towards the direction of the guide piece 3, and displacement in the opposite direction does not occur, the slips 23 are fully opened and kept in an opened state all the time, and the function of anchoring the soluble bridge plug is achieved.

Referring back to fig. 5 and 6, the surface of the spiral surface 221 of the variable diameter spiral seal ring 22 is preferably smooth. Because the surfaces of the spiral surfaces 221 are smooth, the smooth surfaces can reduce the resistance caused by friction between the spiral surfaces 221, and the variable-diameter spiral sealing ring 22 is easier to be spread in the setting process, so that the setting difficulty is reduced. And meanwhile, the spiral surfaces 221 adopt a flat structure, and the structure can enlarge the contact area of each spiral surface 221 between the sealing rings, so that the bonding between the spiral surfaces is tighter, and the sealing performance of the variable-diameter spiral sealing ring 22 is improved. In addition, by coating the sealing grease on the spiral surface 221 of the variable diameter spiral sealing ring 22 to form an oil film, the resistance between the surfaces of the spiral surfaces is further reduced, and by reducing the contact between the variable diameter spiral sealing ring 22 and the dissolution liquid, the dissolution speed of the variable diameter spiral sealing ring 22 in the dissolution liquid is slowed down, and long-time setting is realized to meet the requirement of the subsequent long-time-consuming fracturing work.

Referring again to fig. 5 and 6, more preferably, the pitch of the variable diameter helical seal ring 22 is 1 to 10mm. The smaller the pitch of the variable diameter spiral seal ring 22, the better the sealing performance. The variable diameter spiral sealing ring type soluble bridge plug in the embodiment can adopt variable diameter spiral sealing rings 22 with different pitches and turns according to actual application scenes so as to meet the requirements of sealing performance of the sealing rings in different scenes and simultaneously play a role in controlling manufacturing cost.

Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a combination of two variable diameter spiral seal rings in the embodiment, and fig. 8 is a cross-sectional view of two variable diameter spiral seal rings in the embodiment, more preferably, the number of variable diameter spiral seal rings 22 is two, two variable diameter spiral seal rings 22 are rotationally combined, and spiral surfaces 221 of two variable diameter spiral seal rings 22 are sequentially overlapped in a staggered manner, so that each spiral surface 221 is tightly attached, the number of spiral turns is increased, and the stability and sealing performance of the overall structure of the variable diameter spiral seal ring 22 are improved.

Referring back to fig. 3 and 4, more preferably, the embodiment is further provided with a rubber retaining ring 4, the rubber retaining ring 4 is sleeved outside the pressing member 1, and the rubber retaining ring 4 is covered on the end surface of the soluble rubber 21 far away from one end of the variable diameter spiral sealing ring 22. In the well-in pumping process of the soluble bridge plug, the rubber sleeve retainer ring 4 can buffer the impact of fluid, plays a role in protecting the soluble rubber sleeve 21, avoids the displacement of the soluble rubber sleeve 21 caused by the impact of pumped fluid and is expanded in advance, and ensures that the setting process can be started after the soluble bridge plug is pumped to a specified position.

Referring to fig. 3, 4, 12 and 14, fig. 12 is a schematic structural view of the head according to the embodiment, and fig. 14 is another schematic structural view of the slip according to the embodiment, and more preferably, the guide 3 includes the head 31 and the guide slope 311. The leading head 31 is clamped at one end of the slips 23 far away from the compacting member 1. The guiding inclined plane 311 is annularly arranged on the end surface of the leading head 31, which is close to one end of the slip 23, the end surface of the slip 23, which corresponds to one end of the guiding inclined plane 311, is provided with a sliding surface 234, and the guiding inclined plane 311 is attached to the sliding surface 234 and can slide relatively. During pumping of the soluble bridge plug into the well, the lead 31 acts to prevent the slips 23 from striking or inserting into the well wall, allowing the soluble bridge plug to smoothly reach the designated setting position. During the opening process of the slips 23, the guide inclined surface 311 and the sliding surface 234 always keep relative sliding in a contact manner, and the guide inclined surface 311 plays a role in guiding the opening direction of the slips 23, so that the slips 23 can be anchored on the inner wall of the casing 6 according to a preset position.

Referring to fig. 3, 4, 13 and 14, more preferably, the slip 23 includes a plurality of first cracks 232 and a plurality of second cracks 233. The first cracks 232 are formed from one end of the slip 23 to the other end of the slip 23, and have a gap with the other end of the slip 23, and the plurality of first cracks 232 are sequentially arranged at intervals along the circumferential direction. The second cracks 233 are formed from the other end of the slip 23 toward one end of the slip 23, and have a gap with one end of the slip 23, the plurality of second cracks 233 are sequentially arranged at intervals along the circumferential direction, and the plurality of first cracks 232 and the plurality of second cracks 233 are sequentially staggered along the circumferential direction. The split-type design of the slips 23 ensures that the slips 23 are fully opened during setting, while maintaining the stability and integrity of the overall structure of the slips 23 prior to setting, allowing the slips 23 to better anchor to the inner wall of the casing 6. In addition, the slips 23 are provided with the slips holes 235 on the outer surface, and the slips particles are arranged outside the slips holes 235, so that in the process of expanding and anchoring the slips 23, the slips particles are synchronously embedded into the casing 6, friction between the slips 23 and the casing 6 is increased, and the anchoring effect of the slips 23 is further improved.

In the setting process of the soluble bridge plug, the first insection 121 arranged on the cone 12 and the second insection 231 arranged on the slip 23 cooperate to form an anti-fall insection structure, and the cone 12 only moves along the axis of the slip 23 towards the direction of the leading head 31 and does not displace in the opposite direction. By continuously moving the cone 12 towards the leading head 31, the cone surface of the cone 12 pushes the soluble rubber barrel 21 to be gradually spread until the outer diameter of the soluble rubber barrel 21 is closely attached to the inner wall of the sleeve 6, and the function of sealing the annular space between the cone 12 and the inner wall of the sleeve 6 is achieved. Simultaneously, the conical surface of the cone 12 pushes the slips 23 to open synchronously, the slips are continuously close to the inner wall of the sleeve 6 until the slips are tightly attached, slip particles installed outside slip holes 235 formed in the outer surface of the slips 23 are synchronously embedded into the inner wall of the sleeve 6, and the soluble bridge plug is successfully anchored on the inner wall of the sleeve 6. Meanwhile, the annular width of the spiral faces 221 of the variable-diameter spiral sealing ring 22 is unchanged, the spiral faces 221 are mutually clung and only radially spirally spread, the whole thickness of the spread spiral faces 221 is uniform, the situation of disconnection does not occur, sealing failure caused by embedding the soluble rubber barrel 21 into a gap of the slips 23 can be prevented, and the effect of protecting the soluble rubber barrel 21 is achieved. Simultaneously, the soluble rubber cylinder 21 is synchronously and uniformly spread to a preset sealing position in the setting process, so that complete sealing is realized. In addition, the variable diameter spiral seal ring 22 also has the function of sealing the annular region between the cone 12 and the inner wall of the casing 6, and plays a role of double sealing together with the soluble glue barrel 21. And after the variable diameter spiral sealing ring 22 is spread, the spiral surfaces 221 can uniformly distribute pressure, so that the requirement on manufacturing materials is reduced, the selection range of the manufacturing materials is enlarged, and the manufacturing cost is reduced. The spiral surface 221 of the variable diameter spiral sealing ring type soluble bridge plug in the embodiment can be tightly attached together after setting to form a compact sealing surface, so that the annular area of the sealing sleeve 6 and the surface of the cone 12 is formed, the double sealing effect is formed together with the soluble rubber barrel 21, and meanwhile, the soluble rubber barrel 21 can be protected, and the sealing performance of the soluble bridge plug is more efficient and stable.

Embodiment two:

referring to fig. 3, 4 and 9, fig. 9 is a schematic structural view of a setting device composed of a variable diameter screw seal ring type soluble bridge plug and an adapter according to an embodiment. The setting device in this embodiment includes the variable diameter screw seal ring type soluble bridge plug and the adapter body 5 in the first embodiment. The adapter body 5 includes an adapter sleeve 51, an adapter 52, an adapter pull rod 53, and an adapter adjustment nut 54. The adapter sleeve 51 is provided at the end of the compression member 1 remote from the slips 23. One end of the adapter rod 53 is connected to the guide 3, and the other end of the adapter rod 53 extends in the axial direction of the slips 23 and is located in the central bore of the setting device. The adapter shoe 52 is provided at the end of the adapter rod 53 remote from the guide 3. The adapter adjusting nut 54 is fixed on the outer wall of the adapter tie rod 53, which is close to the adapter 52, through threads arranged in the adapter 52, and the adapter adjusting nut 54 is connected with the compression piece 1 in a clamping manner.

Specifically, one end of the adapter pull rod 53 is fixedly connected with the guide head 31 through the shear pin 32, so that the adapter pull rod 53 does not axially displace relative to the soluble bridge plug during setting. The adapter adjusting nut 54 is connected with the cone 12 by the set screw 11, the set screw 11 having a cushioning effect, avoiding that the adapter pusher 51 pushes the cone 12 in advance during pumping. After the setting device is pumped to the preset setting position, the adapter push cylinder 51 shears the set screw 11 and pushes the cone 12 to press along the axis of the slips 23 towards the leading head 31, and at this time, the adapter pull rod 53 does not axially displace relative to the soluble bridge plug. When the soluble bridge plug is set, the adaptor pushing cylinder 51 pushes the cone 12 to shear the shear pin 32, the adaptor body 5 is separated from the soluble bridge plug, shearing releasing is completed, and then the adaptor body 5 can be lifted and recovered. After setting is completed, the adapter body 5 can be recycled, so that the setting cost is reduced.

Referring to fig. 3, 4, 9 and 10, the setting device in the present embodiment is applied as follows:

one end of the adapter rod 53 is connected to the lead 31 by the shear pin 32 and the adapter adjustment nut 54 is connected to the cone 12 by the set screw 11. The setting device is conveyed to a preset position of the sleeve 6 by using a cable or a pipe column, the adapter push cylinder 51 is pushed to shear the set screw 11 to start setting, the adapter push cylinder 51 pushes the cone 12 to press towards the direction of the leading head 31 along the axis of the slips 23, in the pressing process, the cone surface of the cone 12 expands the cone retainer ring 4, simultaneously radially expands the soluble cone 21 axially unchanged, the variable-diameter spiral seal ring 22 is also radially expanded axially unchanged, and the slips 23 are also radially expanded. The outer diameters of the soluble rubber barrel 21 and the variable diameter spiral sealing ring 22 are tightly attached to the inner wall of the sleeve 6, the slips 23 are opened continuously, and simultaneously, slip particles in the slip holes 235 are synchronously embedded into the inner wall of the sleeve 6. When the outer diameter of the soluble rubber cylinder 22 is tightly attached to the inner wall of the sleeve 6, the inner diameter is tightly attached to the conical surface of the cone 12, and meanwhile, the outer diameter of the variable-diameter spiral sealing ring 22 is tightly attached to the inner wall of the sleeve 6, and the inner diameter is tightly attached to the conical surface of the cone 12, the slips 23 play a role in anchoring the soluble bridge plug. The adaptor pushing cylinder continuously pushes the cone 12 to move, when the hand loss force is reached, the shearing pin 32 is sheared by the cone 12, the adaptor pull rod 53 is separated from the leading head 31, the adaptor main body 5 is separated from the soluble bridge plug to complete shearing release, then the adaptor main body 5 is lifted and recovered, and the leading head 31 naturally falls down to the bottom of the well. After the adapter main body 5 is taken out from the opening of the sleeve 6, the soluble balls 7 are put into the sleeve 6, a sealing surface (not shown in the figure) is arranged in a cavity hole of the inner surface of one end of the cone 12 far away from the slips 23, and after the soluble balls 7 reach the sealing surface of the cone 12, the sleeve 6 can be sealed up and down from the position of the soluble bridge plug through the whole soluble bridge plug, so that subsequent fracturing work can be carried out.

In summary, in this embodiment, the annular width of the spiral surface is unchanged in the setting process by the variable-diameter spiral sealing ring, and the spiral surfaces are mutually clung and only radially spirally spread, so that the whole thickness of the variable-diameter spiral sealing ring type soluble bridge plug is uniform after spreading, and the situation that the soluble rubber barrel is not broken can be prevented from being embedded into a slip gap to cause sealing failure, so that the soluble rubber barrel is protected, and meanwhile, the soluble rubber barrel is synchronously and uniformly spread to a preset sealing position in the setting process, so that complete sealing is realized. In addition, the variable diameter spiral sealing ring also has the function of sealing the annular space between the cone and the inner wall of the sleeve, and plays a role of double sealing together with the sol cylinder. And after the variable-diameter spiral sealing ring is spread, the spiral surfaces can uniformly distribute pressure, so that the requirement of manufacturing materials is reduced, the selection range of the manufacturing materials is enlarged, and the manufacturing cost is reduced. Secondly, two variable diameter spiral sealing rings are simultaneously used in a rotary combination mode, so that the joint between the spiral surfaces is tighter, the number of spiral turns is increased, and the stability and the sealing performance of the variable diameter spiral sealing rings are further improved.

The above is merely an embodiment of the present utility model, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims (10)

1. The variable diameter spiral sealing ring type soluble bridge plug is characterized by comprising a pressing piece (1), a clamping piece (2) and a guide piece (3); the clamping piece (2) comprises a soluble rubber cylinder (21), a variable-diameter spiral sealing ring (22) and slips (23); the guide piece (3) is arranged at one end of the slip (23), and the other end of the slip (23) is connected with the pressing piece (1); along keeping away from slips (23) towards being close to slips (23), soluble rubber barrel (21) with variable diameter spiral sealing ring (22) cover in proper order is located compress tightly outside piece (1), just variable diameter spiral sealing ring (22) opposite two sides hug closely respectively soluble rubber barrel (21) with slips (23).

2. Variable diameter helical sealing ring type soluble bridge plug according to claim 1, characterized in that the compression element (1) comprises a cone (12); one end of the cone (12) with a smaller end face is connected into the slips (23), the variable-diameter spiral sealing ring (22) is sleeved outside the cone (12), and the inner diameter of the variable-diameter spiral sealing ring (22) is gradually increased along the direction of the slips (23) towards the cone (12).

3. The variable diameter spiral seal ring type soluble bridge plug according to claim 2, wherein the cone (12) is provided with a first insection (121), the first insection (121) is annularly arranged on the outer wall of one end of the cone (12) with a smaller end face, the slip (23) is annularly provided with a second insection (231) near the inner wall of one end of the cone (12), and the first insection (121) and the second insection (231) are matched to form an anti-reversing insection structure.

4. The variable diameter helical seal ring type soluble bridge plug of claim 1, wherein the variable diameter helical seal ring (22) has a smooth surfaced helical surface (221).

5. The variable diameter helical seal ring type soluble bridge plug of claim 4, wherein the number of variable diameter helical seal rings (22) is two; the two variable-diameter spiral sealing rings (22) are rotationally combined, and spiral surfaces (221) of the two variable-diameter spiral sealing rings (22) are sequentially overlapped in a staggered mode.

6. The variable diameter helical seal ring type soluble bridge plug of claim 1, wherein the pitch of the variable diameter helical seal ring (22) is 1-10 mm.

7. The variable diameter spiral seal ring type soluble bridge plug of claim 1, further comprising a packing element retainer ring (4); the packing element retaining ring (4) cover is located outside compressing tightly piece (1), just packing element retaining ring (4) lid is located soluble packing element (21) keep away from the terminal surface of variable diameter spiral sealing ring (22) one end.

8. Variable diameter helical sealing ring type soluble bridge plug according to claim 1, characterized in that the guide (3) comprises a lead (31) and a guiding ramp (311); the leading head (31) is clamped at one end, far away from the pressing piece (1), of the slip (23); the guide inclined surface (311) is arranged on the end surface of the leading head (31) close to one end of the slip (23) in a surrounding mode, a sliding surface (234) is arranged on the end surface of the slip (23) corresponding to one end of the guide inclined surface (311), and the guide inclined surface (311) is attached to the sliding surface (234) and can slide relatively.

9. The variable diameter helical seal ring type soluble bridge plug of claim 1, wherein the slips (23) include a plurality of first cracks (232) and a plurality of second cracks (233); the first cracks (232) are formed from one end of the slip (23) to the other end of the slip (23), a gap is formed between the first cracks and the other end of the slip (23), and a plurality of the first cracks (232) are sequentially arranged at intervals along the circumferential direction; the second cracks (233) are formed from the other end of the slip (23) towards one end of the slip (23), gaps are formed between the second cracks (233) and one end of the slip (23), the second cracks (233) are sequentially arranged at intervals along the circumferential direction, and the first cracks (232) and the second cracks (233) are sequentially staggered along the circumferential direction.

10. A setting device comprising a variable diameter spiral seal ring type soluble bridge plug as claimed in any one of claims 1 to 9.