CN112682002B - All-metal soluble bridge plug - Google Patents

Abstract

The invention relates to the technical field of bridge plugs, aims to solve the problems that the existing soluble bridge plugs are too slow in dissolution rate and insoluble or indissolvable in rubber under low-temperature conditions, and provides an all-metal soluble bridge plug, which comprises the following components in percentage by weight: a central tube and a guide shoe; the outer peripheral surface of one end of the guide shoe close to the central tube is a first conical surface; the cone is matched with the central tube; the peripheral surface of one end of the cone close to the central tube is a conical second conical surface; one end of the inner peripheral surface of the clamping and sealing structure, which corresponds to the guide shoe, is provided with a conical surface matched with the first conical surface, and one end of the inner peripheral surface, which corresponds to the cone, is provided with a conical surface matched with the second conical surface; when the cone moves in the direction of the guide shoe, the clamping and sealing structure is expanded in the radial direction until part of the clamping and sealing structure is clamped on the sleeve and part of the clamping and sealing structure is in sealing fit with the sleeve. The invention has the advantages of simple structure and convenient realization of clamping and sealing.

Description

All-metal soluble bridge plug

Technical Field

The invention relates to the technical field of bridge plugs, in particular to an all-metal soluble bridge plug.

Background

The bridge plug can block oil, gas, water, leakage and other layers according to requirements, and is mainly applied to the field of oil and gas exploitation energy.

Some existing bridge plugs have the problem of high overall cost due to the complex structure required for having the functions of blocking and sealing simultaneously.

Disclosure of Invention

The invention aims to provide an all-metal soluble bridge plug to solve the problem that the overall cost is high because a complex structure needs to be arranged for the existing bridge plug to have the functions of clamping and sealing.

The embodiment of the invention is realized by the following steps:

an all-metal soluble bridge plug capable of fitting within a casing, comprising:

a central tube;

a guide shoe connected to one axial end of the center tube; the outer peripheral surface of one end of the guide shoe close to the central tube is a first conical surface;

a cone fitted to the other axial end of the center pipe and movable in a direction approaching the guide shoe; the peripheral surface of one end of the cone close to the central tube is a conical second conical surface; and

the end of the inner peripheral surface of the clamping and sealing structure, which corresponds to the guide shoe, is provided with a conical surface matched with the first conical surface, and the end of the inner peripheral surface, which corresponds to the conical body, is provided with a conical surface matched with the second conical surface; the locking seal structure is configured to be expanded in the radial direction so as to be partially locked to the sleeve and partially sealingly attached to the sleeve when the cone moves in the direction of the guide shoe.

The soluble bridge plug of full metal in this scheme accessible cone is pressed into to the guide shoe relatively, makes to block the seal structure and radially enlarge under the extrusion guide of first conical surface and second conical surface and to block and seal in the sleeve pipe, realizes the fixed and sealed of soluble bridge plug of full metal and sleeve pipe simultaneously, simple structure, convenient to use.

In one embodiment:

the clamping and stopping sealing structure and the sleeve are clamped and stopped at a position below the position where the clamping and stopping sealing structure and the sleeve are in sealing fit with the sleeve.

In one embodiment:

the clamping and stopping sealing structure comprises a clamping and stopping component and a sealing component;

one end of the inner circumferential surface of the clamping component is a third conical surface matched with the first conical surface; the other end of the inner peripheral surface of the clamping component is a fourth conical surface matched with the second conical surface; the outer peripheral surface of the clamping component is provided with a clamping structure which can be clamped on the sleeve when the clamping component is radially expanded;

the sealing assembly is annular, the sealing assembly is sleeved on the second conical surface, and the inner annular surface of the sealing assembly is a conical surface matched with the second conical surface;

the sealing component is abutted against the end face of one end, far away from the guide shoe, of the clamping component.

In one embodiment:

the sealing assembly comprises an expansion ring and a sealing ring connected to the outer annular surface of the expansion ring;

the expander is made of a high-ductility material such as magnesium-aluminum alloy so that the expander can expand radially under the compression of the cone.

In one embodiment:

the clamping and stopping assembly comprises a slip, and slip teeth are convexly arranged on the outer peripheral surface of the slip;

the slips comprise a plurality of first cutting grooves and a plurality of second cutting grooves which are sequentially distributed at intervals along the circumferential direction; the first slot cut into but not extending from an axial first end of the slip to an axial second end thereof, the second slot cut into but not extending from the axial second end of the slip to the axial first end thereof;

the periphery of one end of the slip, which is close to the guide shoe, is sleeved with a slip ring;

one end of the inner circumferential surface of the clamping component is a third conical surface matched with the first conical surface; the other end of the inner peripheral surface of the clamping component is a fourth conical surface matched with the second conical surface; the outer peripheral surface of the clamping component is provided with a clamping structure which can be clamped on the sleeve when the clamping component is expanded in the radial direction; the axial end face of one end, close to the cone, of the clamping component is a fifth conical surface which is conical and convex, and the taper angle of the fifth conical surface is complementary to the fourth conical surface;

the sealing assembly is annular, the sealing assembly is sleeved on the second conical surface, and the inner annular surface of the sealing assembly is a conical surface matched with the second conical surface; the axial end face of one end, close to the clamping component, of the sealing component is a sixth conical surface which is conical and concave; the seal assembly abuts the tapered male fifth conical surface of the stop assembly with its tapered female sixth conical surface to exert a radially inward force on both axial ends of the slip in cooperation with the slip ring.

Through the structural design, when the slip is greatly extruded, one end of the slip is limited by the radial inward force of the slip ring, and the other end of the slip is limited by the force applied by the sixth conical surface of the sealing assembly in the radial inward direction. In this embodiment, the radial inward forces applied to the two ends of the slip may be calculated to match the radial inward forces applied to the two ends of the slip so that the two ends of the slip may expand as synchronously as possible when the slip is squeezed. The method may be implemented by means of simulation or test, which is not described herein.

In one embodiment:

the taper angle of the fifth taper surface and the taper angle of the sixth taper surface are 60-75 degrees.

In one embodiment:

the pipe wall of the central pipe is provided with a cutting groove which penetrates along the direction parallel to the axis, so that the central pipe is in an incomplete annular structure;

the outer peripheral face of center tube is close to guide shoe one end and is equipped with along being on a parallel with its axial distribution's stopping tooth, the one end that the guide shoe is close to the center tube is equipped with first hole, the hole face of first hole is equipped with the latch that can block in stopping tooth.

In one embodiment:

the pipe wall of the central pipe is provided with a cutting groove which penetrates along the direction parallel to the axis, so that the central pipe is in an incomplete annular structure;

the one end that the outer peripheral face of center tube is close to the cone is equipped with along being on a parallel with its axial distribution's stopping tooth, the one end that the cone is close to the center tube is equipped with the second hole, the hole face in second hole is equipped with the latch that can block in stopping tooth to make can guide one-way forward movement in shoes direction and can not retreat relatively at the cone.

In one embodiment:

the expansion ring comprises a front ring wall with larger thickness and a rear ring wall with smaller thickness; the peripheral surface of the rear annular wall and the peripheral surface of the front annular wall are coplanar;

a plurality of slots cut into the rear end of the rear annular wall are circumferentially distributed on the rear annular wall, and at least the rear part of the rear annular wall is divided into a plurality of circumferentially cut arc pieces by the slots.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings referred to in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

A schematic diagram of the structure of an all-metal soluble bridge plug in an embodiment of the invention is shown in fig. 1;

FIG. 2 is a schematic diagram showing the fit of an all-metal soluble bridge plug and casing;

FIG. 3 is a three-dimensional view of slips in an embodiment of the present invention;

in figure 4 there is shown a cross-sectional view of an expander in an embodiment of the invention;

FIG. 5 is a view taken along line A of FIG. 4;

FIG. 6 is a three-dimensional view of a guide shoe in an embodiment of the present invention;

FIG. 7 is a schematic illustration of a center tube in an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a base pipe in an embodiment of the present invention;

FIG. 9 is an enlarged view of FIG. 7 at B;

fig. 10 is an enlarged view of fig. 7 at C.

Icon: the full-metal soluble bridge plug 100, the expansion ring 10, the receiving groove 11, the inner annular surface 12, the outer annular surface 13, the tapered base surface 14, the tapered surface section 15, the groove surface section 16, the front tapered surface section 17, the rear tapered surface section 18, the first groove surface section 19, the second groove surface section 20, the combined surface 21, the rear annular wall 22, the cut 23, the arc piece 24, the front annular wall 25, the fillet 26, the seal ring groove 27, the center tube 40, the shoe guide 41, the cone 42, the clamping seal structure 43, the anti-back tooth 44, the first inner hole 45, the second inner hole 46, the clamping component 47, the seal component 48, the clamping structure 49, the slip 50, the slip tooth 51, the first cut groove 52, the second cut groove 53, the slip ring 54, the seal ring 55, the hole 56, the grease 57, the guide groove 58, the guide rib 59, the clamping tooth 60, the cut groove 61, the axial first end D1, the axial second end D2, the first tapered surface P1, the second tapered surface P2, the third tapered surface P3, the fourth tapered surface P4, the fifth tapered surface P5, the sixth tapered surface P6, the receiving position S1, the sleeve receiving position S2, and the sleeve attaching position S1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring collectively to fig. 1, the present invention also provides an all-metal soluble bridge plug 100 comprising a center tube 40, a boot 41, a cone 42, and a retaining seal structure 43.

Wherein a guide shoe 41 is attached to one axial end of the center tube 40. The wall of the central tube has a slot 61 extending through it in a direction parallel to the axis, so that the central tube has a partially annular structure. And the central tube can be made of elastic materials such as aluminum magnesium alloy, and after the cutting groove 61 is arranged, the central tube can be radially contracted by extrusion or radially and elastically expanded and restored when the extrusion force is removed.

The outer peripheral face of center tube is close to guide shoe one end and is equipped with along being on a parallel with its axial distribution's stopping tooth 44, the guide shoe is close to the one end of center tube and is equipped with first hole 45, the hole face of first hole is equipped with latch 60 that can block in stopping tooth 44.

The one end that the outer peripheral face of center tube is close to the cone is equipped with along being on a parallel with its axial distribution's stopping tooth, the one end that the cone is close to the center tube is equipped with second hole 46, the hole face of second hole is equipped with latch 60 that can block in stopping tooth 44 to make can move forward in the cone one-way relatively guide shoes direction and can not retreat.

Therefore, when the cone, the guide shoe and the central tube are relatively static, the clamping teeth are clamped in the stopping teeth, so that the guide shoe and the cone can be prevented from retreating relative to the central tube; and when the cone moves relatively close to the guide shoe, the cone and the guide shoe apply radial inward pressure to the central tube through the clamping teeth, so that the central tube is radially contracted without stopping relative advance of the cone. The retaining action is mainly determined by the orientation of the teeth and will not be described in detail here.

In this embodiment, one end of the inner peripheral surface of the locking seal structure 43 corresponding to the guide shoe 41 is a tapered surface that fits to the first tapered surface P1, and one end of the inner peripheral surface corresponding to the taper 42 is a tapered surface that fits to the second tapered surface P2. When the cone 42 moves in the direction of the guide shoe 41, the locking seal structure 43 can be expanded in the radial direction so that a part thereof is locked to the sleeve 200 and a part thereof is in sealing contact with the sleeve 200. The all-metal soluble bridge plug 100 is in a condition to capture and seal against the sleeve 200, see FIG. 2.

The all-metal soluble bridge plug 100 in the embodiment can be pressed into the guide shoe 41 through the taper body 42, so that the clamping and sealing structure 43 expands to clamp and seal the sleeve 200 in the radial direction under the extrusion guidance of the first conical surface P1 and the second conical surface P2, and the all-metal soluble bridge plug 100 and the sleeve 200 are fixed and sealed at the same time, and the all-metal soluble bridge plug is simple in structure and convenient to use.

In the operating state, the locking position S1 of the locking and sealing structure 43 and the sleeve 200 is located below the sealing and adhering position S2 of the sleeve 200.

In the present embodiment, the stopper seal structure 43 includes a stopper member 47 and a seal member 48. One end of the inner peripheral surface of the locking member 47 is a third tapered surface P3 that fits the first tapered surface P1. The other end of the inner peripheral surface of the locking component 47 is a fourth conical surface P4 matched with the second conical surface P2; the outer peripheral surface of the locking member 47 is provided with a locking structure 49 which can be locked to the sleeve 200 when the locking member 47 is radially expanded.

In this embodiment, the locking member 47 includes a slip 50, and slip teeth 51 as locking structures 49 are provided on the outer peripheral surface of the slip 50 in a protruding manner.

Referring collectively to fig. 3, the slips 50 include a plurality of first undercut grooves 52 and a plurality of second undercut grooves 53 that are circumferentially spaced apart; the first slot 52 is cut into but does not extend to the axial second end D2 of the slip 50 from the axial first end D1 thereof, and the second slot 53 is cut into but does not extend to the axial first end D1 of the slip 50 from the axial second end D2 thereof. By the arrangement of the first and second undercut grooves 52, 53, the slips can be squeezed to expand radially. In this embodiment, the slips 50 may further include a hole 56 between adjacent first and second notches 52, 53 for receiving the slip teeth 51.

Referring to fig. 1, in this embodiment, the slip 50 is provided with a slip ring 54 around its outer circumference at an end adjacent to the shoe 41. The axial end surface of the locking component 47 near one end of the cone 42 is a fifth conical surface P5 which is conical and convex, and the conical angle of the fifth conical surface P5 is complementary to the fourth conical surface P4.

In this embodiment, the sealing member 48 is annular, the sealing member 48 is disposed on the second tapered surface P2, and the inner annular surface 12 is a tapered surface adapted to the second tapered surface P2.

In this embodiment, the seal assembly 48 includes an expander 10 and a seal ring 55 coupled to the outer annular surface 13 of the expander 10. The illustrated two seal rings 55 are fitted in the two seal ring grooves 27 of the expander 10. In this embodiment, the expander 10 is made of a highly ductile material such as magnesium-aluminum alloy so that it can expand radially under the compression of the cone 42. In the scheme, the outer annular surface is expanded to form sealing with the sleeve where the all-metal soluble bridge plug is located. The sealing between the outer ring surface and the sleeve can be direct attaching sealing between the outer ring surface and the sleeve, or can be sealing between the outer ring surface and the sleeve by a sealing ring arranged on the outer peripheral surface of the expansion ring. And for the situation that the outer ring surface and the sleeve are directly jointed and sealed, the outer ring surface is not required to be provided with a sealing ring groove. In practice, the all-metal soluble bridge plug for well entry is mostly sealed in a mode without a sealing ring.

With reference to fig. 4 and 5, the expander 10 for the all-metal soluble bridge plug 100 provided in the present embodiment has an annular shape, and an axial end surface of the expander 10 near one end of the locking component 47 is a sixth conical surface P6 which is conically concave; the seal assembly 48 abuts the tapered convex fifth taper surface P5 of the stop assembly 47 with its tapered concave sixth taper surface P6 to apply a radially inward force on both axial ends of the slip in cooperation with the slip ring 54.

With this design, when the slips are inflated, one end is limited by the radially inward force of the slip ring 54, and the other end is limited by the radially inward component of the force exerted by the sixth tapered surface P6 of the seal assembly 48. In this embodiment, the radial inward forces applied to the two ends of the slip may be calculated to match the radial inward forces applied to the two ends of the slip so that the two ends of the slip may expand as synchronously as possible when the slip is squeezed. The method can be realized by means of simulation or test, and the like, which is not described herein again. The taper angles are arranged in a complementary mode, so that when the cone is squeezed, the interaction force between the expansion ring and the slips is parallel to the second taper surface of the cone, and synchronous and uniform expansion of the expansion ring and the slips is facilitated.

Continuing with fig. 4 and 5, the present embodiment provides an expander 10 for an all metal soluble bridge plug 100 having an inner annular surface 12 and an outer annular surface 13. The inner annular surface 12 has a tapered surface section 15 on a tapered base surface 14 and a groove surface section 16 recessed from the tapered base surface 14, the groove surface section 16 defining a receiving groove 11 capable of receiving lubricating or corrosion-resistant grease 57. The expander 10 is capable of being forced to expand radially to an outer annulus 13 for sealing with the all-metal dissolvable bridge plug 100.

When the expander 10 in the scheme is assembled on the conical surface of the cone 42 of the all-metal soluble bridge plug 100, the accommodating groove 11 and the conical surface of the cone 42 jointly enclose an accommodating cavity Q1, and grease 57 can be filled in the accommodating cavity Q1. Before the expansion ring 10 expands, the grease 57 can be used for protecting the conical surface of the cone 42, so that corrosion of the corresponding position of the conical surface of the cone 42 can be avoided or slowed down; the outer annular surface 13 of the expander 10 forms a seal with the inner circumferential surface of the casing 200 in which the all-metal soluble bridge plug 100 is located after expansion, and the grease 57 also provides lubrication to the contact surfaces during expansion.

In this embodiment, the tapered section 15 includes a front tapered section 17 having a smaller diameter and a rear tapered section 18 having a larger diameter, and the groove section 16 is connected between the front tapered section 17 and the rear tapered section 18.

Optionally, the groove face section 16 comprises a first groove face section 19 and a second groove face section 20 connected to each other; the outer end of the first groove surface section 19 is connected with the front conical surface section 17, and the second groove surface section 20 is connected with the rear conical surface section 18. A rear annular wall 22 is defined between the combined surface 21 of the second groove surface section 20 and the rear conical surface section 18 and the corresponding part of the outer annular surface 13, and a plurality of slots 23 distributed on the rear annular wall 22 in the circumferential direction are formed in the rear annular wall 22; a slit 23 is cut forward a set distance from the rear end surface of the rear annular wall 22 in the axial direction of the rear annular wall 22 to divide the rear portion of the rear annular wall 22 into a plurality of circumferentially cut arc pieces 24. The number of the slots 23 in this embodiment is 32, and the slots are uniformly distributed on the circumference. Optionally, the intersection of the first trough-face section 19 and the front cone-face section 17 transitions through a fillet 26. In this embodiment, the width of the slit 23 is 0.1 to 0.2mm. The slit 23 in this embodiment is only a structural slit, and is used for dividing the rear annular wall 22, and the slit width is extremely small, so that the corrosion-resistant grease 57 filled in the accommodating groove 11 does not leak out. In practice, the cut 23 can be formed by wire cutting. In this embodiment, the slit 23 may extend through the entire rear annular wall 22, or may cut only a certain length into the rear portion of the rear annular wall 22. The present embodiment illustrates a slit 23 extending through the entire rear annular wall 22.

In this embodiment, the second groove surface segments 20 are parallel to the outer annular surface 13, and the distance between the outer annular surface 13 is 1.2-1.7mm, for example, the distance may be optionally set to 1.5mm.

In the present embodiment, the front conical surface section 17 and the corresponding portion of the outer annular surface 13 define a front annular wall 25 therebetween; the front ends of the arc pieces 24 are connected to the front annular wall 25. The first and second groove face sections 19, 20 are perpendicular to each other such that the thickness from the rear end of the front annular wall 25 to the front end of the rear annular wall 22 decreases in a stepwise manner. In this way, the main resistance to the expansion of the expander 10 is concentrated in the front wall 25, while the resistance to the expansion of the expander 10 is very small, almost negligible, in the rear wall 22 due to the separation of the slits 23. The inventor finds in research that, for the expander 10, the circumferential uniformity of the structure at the part with small thickness is extremely sensitive, namely, for the part with small thickness of the expander 10, even small deviation of the thickness at each part in the circumferential direction can cause the non-uniformity at the expanding time; in contrast, the circumferential uniformity is less required for the portions of the expander 10 having a greater thickness, i.e., the expansion can be substantially uniform to a greater degree of non-uniformity. Thus, in the present embodiment, the resistance of the rear annular wall 22 to the expansion of the expander 10 is substantially changed to the resistance of the respective arc pieces 24 by cutting the rear annular wall 22 having a small thickness, and the respective arc pieces 24 have a small resistance, so that the expansion can be performed substantially uniformly. The back ring wall 22 of the expander 10 in this embodiment also has the effect of an effective guide for the cone 42 to be pressed in.

In this embodiment, the outer annular surface 13 is provided with a seal ring groove 27 for receiving a seal ring 55; a seal ring groove 27 is provided at the outer annular surface 13 corresponding to the front annular wall 25. Two rings of seal grooves 27 are shown.

In this embodiment, the expander 10 may be made of magnesium-aluminum alloy. In this embodiment, the expander 10 is made of an aluminum magnesium alloy with good ductility, and can expand radially without breaking when being extruded, so as to ensure the sealing capability after expansion. Of course, the expansion ring 10 can be made of other materials capable of ensuring the sealing capability after expansion.

In this embodiment, an axial end surface of the expander 10 close to the end with the smaller diameter of the tapered base surface 14 is a sixth tapered surface P6, and a taper angle of the sixth tapered surface P6 is complementary to a taper angle of the tapered base surface 14.

As with the previous expander 10 for an all-metal soluble bridge plug 100, the expander 10 includes a front annular wall 25 and a rear annular wall 22, and the front annular wall 25 and the rear annular wall 22 are integrally connected in an axial direction; the inner peripheral surface of the front annular wall 25 is tapered with a small front and a large rear; the thickness of the rear annular wall 22 is smaller than that of the front annular wall 25, and the connection part from the inner circumferential surface of the front annular wall 25 to the inner circumferential surface of the rear annular wall 22 is in a step shape; the inner circumferential surface of the junction of the rear annular wall 22 and the front annular wall 25 is recessed to define a receiving groove 11 capable of receiving lubricating or corrosion-resistant grease 57.

Referring to fig. 1 again, in the present embodiment, the expander 10 is sleeved on the second taper surface P2, the taper section of the expander 10 is fitted on the second taper surface P2, and the second taper surface P2 closes the receiving groove 11 to form a receiving cavity Q1; the receiving cavity is filled with grease 57.

In the all-metal soluble bridge plug 100 in the scheme, under the assembly state of the expansion ring 10, grease 57 in the accommodating cavity applies anti-corrosion protection to the conical surface of the cone 42; if necessary, the cone 42 is pressed axially into the expander 10, so that the expander 10 expands radially to form a seal with the casing 200 in which the all-metal soluble bridge plug 100 is located, and during the axial pressing of the cone 42, the grease 57 lubricates the contact part of the second conical surface P2 of the cone 42 and the conical section of the expander 10, and the frictional resistance of the pressing of the cone 42 is reduced.

Referring collectively to fig. 3 and 6, an all metal soluble bridge plug 100 in this embodiment is configured as a guided expanding all metal soluble bridge plug 100. As previously described, all metal soluble bridge plug 100 in this embodiment includes shoe guides 41 and slips 50. One end of the outer peripheral surface of the guide shoe 41 is provided with a first conical surface P1; one end of the inner surface of the slip has a third taper surface P3 that fits the first taper surface P1. The slips comprise a plurality of first cutting grooves 52 and a plurality of second cutting grooves 53 which are sequentially distributed at intervals along the circumferential direction; the first undercut groove 52 is cut into but does not extend from the axial first end D1 of the slip to its axial second end D2, and the second undercut groove 53 is cut into but does not extend from the axial second end D2 of the slip to its axial first end D1.

The axial first end D1 is close to the guide shoe 41. The slip is provided with a guide groove 58 extending along the axial direction of the slip, and the guide shoe 41 is provided with a guide rib 59 along the axial direction. The second cut groove 53 is a groove having a uniform groove width, and the initial section of the first cut groove 52 is a groove having a larger groove width and capable of matching with the guide rib 59, so that the guide rib 59 can be movably fitted to the initial section of the first cut groove 52.

In this embodiment, the guiding rib 59 on the guide shoe 41 and the initial section of the first cut groove 52 are matched to conveniently guide the expansion of the slip, so that the slip can be uniformly expanded.

Alternatively, there are a plurality of guide grooves 58, and the plurality of guide grooves 58 are uniformly distributed at part or all of the first cut grooves 52 in the circumferential direction. Alternatively, the groove width of the guide groove 58 is larger than the groove width of the first cutout groove 52.

In this embodiment, the groove widths of the first undercut 52 and the second undercut 53 are 0.3 to 0.6mm; the width of the guide groove 58 is 2.6-3.4mm. The guide groove 58 is cut into the axial first end D1 and extends for a length less than that of the first cut groove 52.

In the present embodiment, the guide rib 59 protrudes from the generatrix of the first taper surface P1 thereof in the taper surface normal direction.

In other embodiments, the guide slot 58 may be provided separate from the first cut-out 52. Of course, the guide grooves 58 are still used to cooperate with the guide ribs 59.

The all-metal soluble bridge plug 100 in this embodiment is designed to be all-metal soluble, and means that the major components including the expander ring 10, the guide shoe 41, the cone 42, the slip 50, and the slip ring 54 are made of soluble metals such as magnesium-aluminum alloy, but it is not excluded that small components such as slip teeth and some connecting pins are made of other insoluble metals or non-metallic materials. The all-metal soluble bridge plug 100 can temporarily block oil, gas, water, leakage and other layers, high-pressure fracturing construction operation is carried out on a production layer on the upper portion of the all-metal soluble bridge plug 100, and after the fracturing construction operation is completed, main components of the all-metal soluble bridge plug 100, which are made of soluble metals such as magnesium-aluminum alloy, are automatically dissolved under the conditions of liquid and temperature in a well, so that a full channel of the production casing 200 is provided. And the undissolved slip teeth, pins and the like are small in size, so that the smoothness of the channel cannot be influenced. At present, the tool is mainly applied to shale gas well stratum reconstruction.

The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An all-metal soluble bridge plug capable of fitting within a casing, comprising:

a central tube;

a guide shoe connected to one axial end of the center tube; the outer peripheral surface of one end of the guide shoe close to the central tube is a first conical surface;

a cone fitted to the other axial end of the center pipe and movable in a direction approaching the guide shoe; the peripheral surface of one end of the cone close to the central tube is a conical second conical surface; and

the end of the inner peripheral surface of the clamping and sealing structure, which corresponds to the guide shoe, is provided with a conical surface matched with the first conical surface, and the end of the inner peripheral surface, which corresponds to the conical body, is provided with a conical surface matched with the second conical surface; when the cone moves towards the direction of the guide shoe, the clamping and stopping sealing structure can be expanded in the radial direction under extrusion to enable part of the clamping and stopping sealing structure to be clamped on the sleeve and part of the clamping and stopping sealing structure to be in sealing fit with the sleeve, and the clamping and stopping sealing structure comprises a clamping and stopping assembly and a sealing assembly;

one end of the inner circumferential surface of the clamping component is a third conical surface matched with the first conical surface; the other end of the inner peripheral surface of the clamping component is a fourth conical surface matched with the second conical surface; the outer peripheral surface of the clamping component is provided with a clamping structure which can be clamped on the sleeve when the clamping component is expanded in the radial direction;

the sealing assembly is annular, the sealing assembly is sleeved on the second conical surface, and the inner annular surface of the sealing assembly is a conical surface matched with the second conical surface;

the sealing assembly abuts against the end face, far away from the guide shoe, of one end of the clamping and stopping assembly, the clamping and stopping assembly comprises a slip, and slip teeth are arranged on the outer peripheral surface of the slip in a protruding mode;

the slip comprises a plurality of first cutting grooves and a plurality of second cutting grooves which are sequentially distributed at intervals along the circumferential direction; the first slot cut into but not extending to an axial first end of the slip, the second slot cut into but not extending to an axial first end of the slip;

a slip ring is sleeved on the periphery of one end, close to the guide shoe, of the slip;

one end of the inner peripheral surface of the clamping component is a third conical surface matched with the first conical surface; the other end of the inner peripheral surface of the clamping and stopping component is a fourth conical surface matched with the second conical surface; the axial end face of one end, close to the cone, of the clamping component is a fifth conical surface which is conical and convex, and the taper angle of the fifth conical surface is complementary to the fourth conical surface;

the sealing assembly is annular, the sealing assembly is sleeved on the second conical surface, and the inner annular surface of the sealing assembly is a conical surface matched with the second conical surface; the axial end face of one end, close to the clamping component, of the sealing component is a sixth conical surface which is conical and concave; the seal assembly abuts the tapered male fifth conical surface of the stop assembly with its tapered female sixth conical surface to exert a radially inward force on both axial ends of the slip in cooperation with the slip ring.

2. An all-metal soluble bridge plug according to claim 1, wherein:

the clamping and stopping sealing structure and the sleeve are clamped and stopped at a position below the position where the clamping and stopping sealing structure and the sleeve are in sealing fit with the sleeve.

3. An all-metal soluble bridge plug according to claim 1, wherein:

the sealing assembly comprises an expansion ring and a sealing ring connected to the outer annular surface of the expansion ring;

the expansion ring is made of a high-ductility material of magnesium-aluminum alloy, so that the expansion ring can radially expand and expand under the compression of the cone.

4. An all-metal soluble bridge plug according to claim 1, wherein:

the taper angle of the fifth taper surface and the taper angle of the sixth taper surface are 60-75 degrees.

5. An all-metal soluble bridge plug according to claim 1, wherein:

the pipe wall of the central pipe is provided with a cutting groove which penetrates along the direction parallel to the axis, so that the central pipe is in an incomplete annular structure;

the outer peripheral face of center tube is close to guide shoe one end and is equipped with along being on a parallel with its axial distribution's stopping tooth, the guide shoe is close to the one end of center tube and is equipped with first hole, the hole face of first hole is equipped with the latch that can block in stopping tooth.

6. An all-metal soluble bridge plug according to claim 1, wherein:

the pipe wall of the central pipe is provided with a cutting groove which penetrates along the direction parallel to the axis, so that the central pipe is in an incomplete annular structure;

the one end that the peripheral face of center tube is close to the cone is equipped with along being on a parallel with its axial distribution's stopping tooth, the one end that the cone is close to the center tube is equipped with the second hole, the hole face of second hole is equipped with the latch that can block in stopping tooth to make can be relatively to the one-way forward movement of guide shoe direction and can not retreat at the cone.

7. An all-metal soluble bridge plug according to claim 3, wherein:

the expansion ring comprises a front ring wall with larger thickness and a rear ring wall with smaller thickness; the peripheral surface of the rear annular wall and the peripheral surface of the front annular wall are coplanar;

a plurality of slots cut into the rear end of the rear annular wall are circumferentially distributed on the rear annular wall, and at least the rear part of the rear annular wall is divided into a plurality of circumferentially cut arc pieces by the slots.

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