High-pressure-bearing drillable soluble bridge plug

Abstract

The utility model relates to the technical field of bridge plugs, and discloses a high-pressure-bearing drillable soluble bridge plug which comprises a central pipe, an expansion ring, a rubber sleeve, an upper positioning piece and a lower positioning piece, the expansion ring, the rubber sleeve, the upper positioning piece and the lower positioning piece are all arranged on the outer wall of the central pipe in a sleeving mode, the upper positioning piece is located at one end of the rubber sleeve, and the expansion ring is located at the end, away from the upper positioning piece, of the rubber sleeve. A ring groove is axially formed in the outer wall of the expansion ring, the lower positioning piece is arranged at the end, away from the rubber barrel, of the expansion ring, the outer wall of the end, away from the lower positioning piece, of the center pipe is sleeved with a push barrel, the push barrel can push the upper positioning piece to move towards the lower positioning piece, and an adapter is arranged in the center pipe and used for fixing the center pipe. Under the action of pressure, the inclined planes formed along the annular grooves of the fractured expansion rings are staggered, so that the width of the expansion rings is reduced, but the diameter of the expansion rings is increased, the expanded rubber sleeve is continuously supported, the expanded rubber sleeve can be effectively prevented from displacing in a subsequent high-temperature and high-pressure environment, and the sealing performance of the bridge plug to a sleeve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge plug technical field, concretely relates to high pressure bearing drill soluble bridge plug. BACKGROUND

[0002] Petroleum bridge plug is the key equipment for controlling the fluid flow in the well in petroleum exploration and production, and the main function is to seal the layer of oil and gas well, and the working principle of the bridge plug is that the bridge plug is transported to the predetermined position of the casing by cable or pipe column, the pressure generated by the firecracker blasting, hydraulic setting or mechanical setting tool acts on the upper slip, and then the upper cone and the lower cone apply two forces of upward pressure and downward pull on the sealing rubber cylinder, so that the rubber cylinder expands and abuts against the inner wall of the casing, and then the setting of the casing is completed.

[0003] However, since the diameter of the rubber cylinder gradually increases when it expands, the support of the rubber cylinder by the upper cone and the lower cone is limited, and as the rubber cylinder further increases, when the diameter of the rubber cylinder is greater than the diameter of the upper cone and the lower cone, the outer diameter of the rubber cylinder loses the support of the upper cone and the lower cone, and since fracturing needs to be carried out in the casing by explosion in subsequent work, the high temperature and high pressure generated by the explosion causes the rubber cylinder to displace in the casing, which reduces the sealing property of the rubber cylinder to the casing and affects the normal operation of the petroleum exploration work, therefore, the high pressure bearing drill soluble bridge plug is proposed to solve the above problems. SUMMARY

[0004] The utility model intends to provide high pressure bearing drill soluble bridge plug, to solve the problem that the rubber cylinder displaces in the environment of high temperature and high pressure and causes the sealing property to reduce.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: high pressure bearing drill soluble bridge plug, including center tube, expansion ring, rubber cylinder, upper positioning piece and lower positioning piece, the expansion ring, the rubber cylinder, the upper positioning piece and the lower positioning piece are all sleeved on the outer wall of the center tube, and the upper positioning piece is located at one end of the rubber cylinder, the expansion ring is located at the end of the rubber cylinder away from the upper positioning piece, the outer wall of the expansion ring is axially provided with a ring groove, and the ring groove is inclined, the lower positioning piece is arranged at the end of the expansion ring away from the rubber cylinder, the outer wall of the end of the center tube away from the lower positioning piece is sleeved with a push cylinder, the push cylinder can push the upper positioning piece to move downward to the lower positioning piece, the center tube is provided with an adapter, and the adapter is used for fixing the center tube.

[0006] The beneficial effects of the scheme are: the adapter fixes the center pipe, when the push cylinder pushes the upper positioning piece to move close to the lower positioning piece, the lower positioning piece is located at the end of the center pipe, so that the upper positioning piece extrudes the rubber cylinder, the rubber cylinder expands, and the rubber cylinder also extrudes the expansion ring and the lower positioning piece, when the push cylinder continues to push the upper positioning piece, the expansion ring breaks along the sliding groove, because the sliding groove is inclined, when the broken expansion ring is extruded, the first end and the second end of the broken expansion ring are staggered along the inclined surface, so that the width of the expansion ring decreases, but the diameter of the expansion ring increases, thereby supporting the expanded rubber cylinder, preventing the rubber cylinder from moving in the subsequent high temperature and high pressure environment, and affecting the sealing of the sleeve.

[0007] Preferably, as an improvement, the upper positioning piece includes a bottom ring, an upper slip and an upper cone, the bottom ring is sleeved on one end of the center pipe close to the push cylinder, the upper slip is sleeved on the outer wall of the center pipe, one end of the upper slip abuts against the bottom ring, the upper cone is sleeved on the outer wall of the center pipe, and the end of the upper cone away from the bottom ring abuts against the upper slip, and the upper slip wraps the outer wall of the upper cone.

[0008] The beneficial effects are: the bottom ring is used to support the upper slip, avoiding the push cylinder directly acting on the upper end of the upper slip, causing the upper slip to break, improving the stability of the bridge plug, when the upper slip moves to the rubber cylinder under the action of the bottom ring and the push cylinder, the upper slip is expanded by the upper cone because the upper slip wraps the outer wall of the upper cone, so that the outer wall of the expanded upper slip abuts against the inner wall of the sleeve, thereby fixing the bridge plug, preventing the bridge plug from moving under high pressure generated by blasting.

[0009] Preferably, as an improvement, the lower positioning piece includes a lower cone, a lower slip and a cap, the cap is arranged at one end of the center pipe away from the push cylinder, the lower cone is arranged at one end of the expansion ring away from the rubber cylinder, the lower slip is arranged at one end of the lower cone away from the expansion ring, and the lower slip abuts against the cap, and the lower slip wraps the outer wall of the lower cone.

[0010] The beneficial effects are: the cap is used to limit the movement of the lower cone and the lower slip, preventing the lower cone and the lower slip from sliding out of the center pipe under the pushing force provided by the push cylinder, when the lower slip moves to the lower cone, the lower slip is expanded by the lower cone because the lower slip wraps the outer wall of the lower cone, so that the outer wall of the expanded lower slip abuts against the inner wall of the sleeve, thereby fixing the bridge plug, preventing the bridge plug from moving under high pressure generated by blasting.

[0011] Preferably, as an improvement, the end of the cap close to the lower slip is provided with a plurality of first limiting blocks in the radial direction, the end of the lower slip close to the cap is provided with a plurality of second limiting blocks in the radial direction, and the first limiting blocks and the second limiting blocks are staggered.

[0012] The beneficial effects are: the first limiting blocks guide the second limiting blocks, increasing the stability of the expanded lower slip.

[0013] Preferably, as an improvement, the rubber cylinder is provided with a lower guard ring near one end of the expansion ring, and the lower guard ring is sleeved on the outer wall of the central tube.

[0014] The lower guard ring is used for protecting the rubber cylinder, avoiding friction between the expansion ring and the rubber cylinder during extrusion deformation, and preventing the rubber cylinder from being damaged and affecting the sealing performance of the rubber cylinder on the casing.

[0015] Preferably, as an improvement, the outer wall of the upper slip and the outer wall of the lower slip are both radially provided with a plurality of particle groups, each particle group includes a plurality of particles, and the particles are high-strength hard ceramic particles.

[0016] The particles in each particle group are engaged in the inner wall of the casing, so that the bridge plug is fixed on the inner wall of the casing and displacement of the bridge plug in the casing is avoided. Meanwhile, the particles are high-strength hard ceramic particles, so that the particles have extremely high hardness and strength and can withstand extremely high pressure and temperature. The ceramic has good brittleness, and the residual particles engaged in the inner wall of the casing can be easily cleaned under the action of the drilling and grinding tool after the dissolvable bridge plug is dissolved. Compared with hard alloy particles, the particles have great safety for restoring the wellbore drift diameter and drilling and grinding construction in the later stage of the wellbore.

[0017] Preferably, as an improvement, the particles are in a cylindrical shape, one end of the particle close to the central tube is embedded in the upper slip or the lower slip, and the other end of the particle away from the central tube is provided with an inclined plane which can abut against the inner wall of the casing.

[0018] The particles are in a cylindrical shape, which is beneficial to dispersing stress. When the particles are engaged in the inner wall of the casing under the action of the upper slip or the lower slip, the particles can be effectively prevented from being broken. The other end of the particle away from the central tube is provided with an inclined plane, so that the particle has an arc-shaped edge, which is more beneficial to engagement of the particle in the inner wall of the casing and increases the firmness of the bridge plug fixed on the inner wall of the casing.

[0019] Preferably, as an improvement, the central tube, the expansion ring, the upper positioning member and the lower positioning member are all made of dissolvable magnesium alloy metal.

[0020] The central tube, the expansion ring, the upper positioning member and the lower positioning member are all made of dissolvable magnesium alloy metal, so that the bridge plug can be dissolved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a three-dimensional structural schematic view of a bridge plug according to an embodiment of the present application;

[0022] Figure 2 FIG. 2 is a sectional structural schematic view of the bridge plug according to the embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of the first limit block and the second limit block in an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The figure marks in the drawings of the specification include: center tube 1, expansion ring 2, rubber cylinder 3, ring groove 4, push cylinder 5, adapter 6, bottom ring 7, upper slip 8, upper cone 9, lower cone 10, lower slip 11, clamping cap 12, first limit block 13, second limit block 14, lower guard ring 15, particle 16.

[0026] Example

[0027] The embodiment is basically as shown in the attached Figures 1-3 As shown, Figure 1 The high-pressure drillable soluble bridge plug shown includes a central tube 1, an expansion ring 2, a rubber tube 3, an upper positioning piece and a lower positioning piece. The expansion ring 2, the rubber tube 3, the upper positioning piece and the lower positioning piece are all sleeved on the outer wall of the central tube 1. The central tube 1, the expansion ring 2, the upper positioning piece and the lower positioning piece are all set to soluble magnesium alloy metal, such as Figure 2 As shown, the upper positioning piece is located on the outer wall of the left end of the rubber cylinder 3, and the expansion ring 2 is located at the right end of the rubber cylinder 3. An annular groove 4 is axially opened on the outer wall of the expansion ring 2, and the annular groove 4 is inclined and surrounds the outer wall of the expansion ring 2 half a circle. When the expansion ring 2 is subjected to a certain pressure, the expansion ring 2 breaks along the slide groove. The lower positioning piece is located at the right end of the expansion ring 2, and a push cylinder 5 is provided on the outer wall of the left end of the center tube 1. The push cylinder 5 can push the upper positioning piece to move toward the lower positioning piece. The right end of the center tube 1 is threadedly connected to an adapter 6, and the adapter 6 is used to fix the center tube 1.

[0028] The upper positioning part includes a bottom ring 7, an upper cava 8 and an upper cone 9. The bottom ring 7, the upper cava 8 and the upper cone 9 are all slidably mounted on the outer wall of the center tube 1. The bottom ring 7 is mounted on the outer wall of the left end of the center tube 1. The upper cava 8 is located at the right end of the bottom ring 7, and the left end of the upper cava 8 is in contact with the bottom ring 7. The upper cone 9 is located at the right end of the upper cava 8, and the left end of the upper cone 9 is conical. The right end of the upper cava 8 is wrapped around the outer wall of the left end of the upper cone 9.

[0029] The lower positioning part includes a lower cone 10, a lower cava 11 and a clamping cap 12. The lower cone 10 and the lower cava 11 are both slidably mounted on the outer wall of the center tube 1. The clamping cap 12 is threadedly connected to the right end of the center tube 1. The lower cone 10 is located at the right end of the expansion ring 2. The right end of the lower cone 10 is conical. The lower cava 11 is located at the right end of the lower cone 10, and the right end of the lower cava 11 is in contact with the clamping cap 12. The left end of the lower cava 11 is wrapped around the outer wall of the right end of the lower cone 10.

[0030] The lower protecting ring 15 is installed at the right end of the rubber sleeve 3, and is sleeved on the outer wall of the central pipe 1. The right end of the lower protecting ring 15 abuts against the expansion ring 2. The outer wall of the upper slip 8 and the lower slip 11 is radially provided with a plurality of particle groups 16. Each particle group 16 includes a plurality of particles 16. The particles 16 are high-strength hard ceramic particles, and are in a cylindrical shape. The lower end of each particle 16 is inlaid on the outer wall of the upper slip 8 or the lower slip 11. The upper end of each particle 16 is provided with an inclined plane to form an arc-shaped edge, which can be engaged with the inner wall of the casing. The diameter of each particle 16 in the particle group 16 on the outer wall of the upper slip 8 is 8 mm, and is arranged in a triangular shape. The particles 16 in the particle group 16 on the outer wall of the lower slip 11 are arranged in an axial direction of the lower slip 11. The diameters of the two rows of particles 16 close to the lower cone 10 are 8 mm, and the diameter of the row of particles 16 close to the cap 12 is 9.5 mm. Since the width of the lower slip 11 is large, when the lower cone 10 moves to the lower slip 11, the lower slip 11 close to the lower cone 10 is expanded by a large amplitude, and the lower slip 11 close to the cap 12 is expanded by a small amplitude. In order to keep each particle 16 engaged with the inner wall of the casing, the diameter of the particles 16 close to the cap 12 is set to 9.5 mm, and the diameter of the particles 16 close to the lower cone 10 is set to 8 mm.

[0031] As shown in Figure 3 The right end of the cap 12 is radially fixedly installed with a plurality of first limiting blocks 13, and the right end of the lower slip 11 is radially fixedly installed with a plurality of second limiting blocks 14. The first limiting blocks 13 and the second limiting blocks 14 are staggered. Of course, the cap 12 and the first limiting blocks 13, and the lower slip 11 and the second limiting blocks 14 can be integrally formed. The first limiting blocks 13 guide the second limiting blocks 14, thereby increasing the stability of the lower slip 11 when it is expanded.

[0032] The specific implementation process is as follows:

[0033] When the bridge plug is delivered to the predetermined position of the casing by the cable or the pipe column, the center tube 1 is relatively fixed with the adapter 6 due to the threaded connection between the center tube 1 and the adapter 6, when the push cylinder 5 moves to the front end of the bridge plug under the action of the gunpowder or the hydraulic pressure, the push cylinder 5 pushes the bottom ring 7 to move to the cap 12, and sequentially pushes the upper slips 8, the upper cone 9, the rubber cylinder 3, the lower retainer 15, the expansion ring 2 and the lower cone 10 to move to the cap 12, in the process, the upper slips 8 and the lower slips 11 are respectively supported by the upper cone 9 and the lower cone 10, so as to be engaged with the inner wall of the casing under the action of the particles 16, and then the bridge plug is fixed at the predetermined position of the casing, meanwhile, the rubber cylinder 3 is expanded under the extrusion of the upper cone 9 and the lower retainer 15, when the rubber cylinder 3 is expanded, the expansion ring 2 is broken along the ring groove 4 under the pressure, with the continuous movement of the push cylinder 5, the rubber cylinder 3 is continuously expanded, the first end and the second end of the broken expansion ring 2 are staggered along the inclined surface formed by the ring groove 4, so that the width of the expansion ring 2 is reduced, but the diameter of the expansion ring 2 is increased, thereby the expansion ring 2 continues to provide support for the expanded rubber cylinder 3, until the rubber cylinder 3 abuts against the inner wall of the casing, which can effectively prevent the expanded rubber cylinder 3 from being displaced in the subsequent high temperature and high pressure environment, and increase the sealing performance of the bridge plug to the casing.

[0034] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that, for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A high-pressure- bearing drillable dissolvable bridge plug, characterized in that: The device comprises a central pipe, an expansion ring, a rubber sleeve, an upper positioning member and a lower positioning member, the expansion ring, the rubber sleeve, the upper positioning member and the lower positioning member are all sleeved on the outer wall of the central pipe, the upper positioning member is located at one end of the rubber sleeve, the expansion ring is located at the end of the rubber sleeve away from the upper positioning member, the outer wall of the expansion ring is axially provided with a ring groove, the ring groove is obliquely arranged, the lower positioning member is arranged at the end of the expansion ring away from the rubber sleeve, the outer wall of the end of the central pipe away from the lower positioning member is sleeved with a pushing sleeve, the pushing sleeve can push the upper positioning member to move towards the lower positioning member, the central pipe is internally provided with an adapter, and the adapter is used for fixing the central pipe.

2. The high-pressure bridge plug according to claim 1, characterized in that: The upper positioning member comprises a bottom ring, an upper slip and an upper cone, the bottom ring is sleeved on the end of the central pipe close to the pushing sleeve, the upper slip is sleeved on the outer wall of the central pipe, and one end of the upper slip abuts against the bottom ring, the upper cone is sleeved on the outer wall of the central pipe, and abuts against the end of the upper slip away from the bottom ring, and the upper slip is wrapped on the outer wall of the upper cone.

3. The high-pressure bridge plug according to claim 2, characterized in that: The lower positioning member comprises a lower cone, a lower slip and a cap, the cap is arranged at the end of the central pipe away from the pushing sleeve, the lower cone is arranged at the end of the expansion ring away from the rubber sleeve, the lower slip is arranged at the end of the lower cone away from the expansion ring, and the lower slip abuts against the cap, and the lower slip is wrapped on the outer wall of the lower cone.

4. The high-pressure bridge plug according to claim 3, characterized in that: The end of the cap close to the lower slip is radially provided with a plurality of first limiting blocks, and the end of the lower slip close to the cap is radially provided with a plurality of second limiting blocks, and the first limiting blocks and the second limiting blocks are staggered.

5. The high-pressure bridge plug according to claim 4, characterized in that: The end of the rubber sleeve close to the expansion ring is provided with a lower guard ring, and the lower guard ring is sleeved on the outer wall of the central pipe.

6. The high-pressure bridge plug according to claim 5, characterized in that: The outer wall of the upper slip and the outer wall of the lower slip are both radially provided with a plurality of particle groups, each particle group comprises a plurality of particles, and the particles are high-strength hard ceramic particles.

7. The high-pressure bridge plug according to claim 6, characterized in that: The particles are in a cylindrical shape, the end of the particles close to the central pipe is embedded in the upper slip or the lower slip, the end of the particles away from the central pipe is provided with an inclined plane, and the inclined plane can abut against the inner wall of the sleeve.

8. The high-pressure bridge plug according to claim 7, characterized in that: The central pipe, the expansion ring, the upper positioning member and the lower positioning member are all made of soluble magnesium alloy metal.

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