Bridge plug and production tubular column

Abstract

The invention relates to the field of oil and gas well underground construction, and discloses a bridge plug and a production pipe column, the bridge plug comprises a slip (1), a first expansion body (2), a second expansion body (3), a first pipe part (4) and a second pipe part (5), the bridge plug can be arranged in the mode that the first expansion body (2) is inserted into the upper end of the slip (1), and the second expansion body (3) can be inserted into the lower end of the slip (1); the slip (1) is radially expanded for the first time; and the first expansion body (2) and the second expansion body (3) can respectively expand in the radial direction, so that the slip (1) can expand in the radial direction for the second time. By means of the technical scheme, the two expansion bodies can extrude the slip through the gradually-shrunk peripheral faces to achieve one-time expansion, the slip can achieve another-time expansion through expansion of the two expansion bodies, and therefore two-time expansion of the slip can be achieved, the expansion rate of the slip is increased, and packing operation of extreme casing deformation can be achieved.

Description

Technical Field

[0001] The invention relates to oil and gas downhole construction, in particular to a bridge plug and a production pipe string. Background Art

[0002] In the field of oil and gas development, under extreme casing deformation conditions, casing isolation operations need to be performed. In this case, the tool used is required to have an outer diameter as small as possible, and at the same time, it must expand to the largest possible outer diameter after being lowered into the operating position. Therefore, to achieve this isolation operation, a bridge plug with a large expansion rate is required. The existing bridge plug has an insufficient expansion rate and therefore cannot achieve the above function. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a downhole bridge plug with a high expansion rate, which is suitable for extremely variable diameter casing and effectively solves the problems of large annular space setting, anchoring and sealing.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a bridge plug on one hand, characterized in that the bridge plug includes a cava, a first expansion body having a tapered first outer peripheral surface, a second expansion body having a tapered second outer peripheral surface, a first tube portion having a tapered third outer peripheral surface and a second tube portion having a tapered fourth outer peripheral surface, and the bridge plug can be configured as follows: the first expansion body is inserted into the upper end of the cava, and the second expansion body can be inserted into the lower end of the cava, so that the first outer peripheral surface and the second outer peripheral surface can squeeze the cava to make the cava undergo a first radial expansion; the first tube portion can be inserted into the first expansion body and the second tube portion can be inserted into the second expansion body, so that the first expansion body and the second expansion body can expand radially respectively, so that the cava undergoes a second radial expansion.

[0005] In some embodiments, the bridge plug can be configured as follows: the first tube portion pushes the first expansion body to gradually insert into the upper end of the cava, and at the same time the second tube portion pushes the second expansion body to gradually insert into the lower end of the cava, so that the cava first performs the first radial expansion and then performs the second radial expansion.

[0006] In some embodiments, the force required for radial expansion of the first expansion body and the force required for radial expansion of the second expansion body are respectively greater than the force required for radial expansion of the slips.

[0007] In some embodiments, the first expansion body includes a tapered first main body and a first support ring connected to a large end of the first main body, and the second expansion body includes a tapered second main body and a second support ring connected to a large end of the second main body.

[0008] In some embodiments, the force required for the first support ring to break is greater than the force required for the slips to expand radially, and the force required for the second support ring to break is greater than the force required for the slips to expand radially.

[0009] In some embodiments, the first body portion includes a plurality of first expansion plates arranged circumferentially, and the second body portion includes a plurality of second expansion plates arranged circumferentially.

[0010] In some embodiments, the first expansion plate is integrally connected to the first support ring, and the second expansion plate is integrally connected to the second support ring.

[0011] In some embodiments, the slips include a plurality of tooth plates arranged circumferentially.

[0012] In some embodiments, the slips include sealing rings connected to both ends of the tooth plate.

[0013] In some embodiments, the number of the tooth plates, the number of the first expansion plates, and the number of the second expansion plates are the same.

[0014] In some embodiments, the inner surface of the tooth plate is provided with a first limiting groove, and the outer surface of the first expansion plate is provided with a first limiting strip, and the first limiting grooves can respectively guide the first limiting strip to move axially.

[0015] In some embodiments, a second limiting groove is disposed on the inner surface of the tooth plate, and a second limiting strip is disposed on the outer surface of the second expansion plate, and the second limiting groove can guide the second limiting strip to move axially.

[0016] In some embodiments, a ball pitching seat is disposed at the upper end of the first tube portion.

[0017] In some embodiments, the first pipe portion includes a first reducer and a first circular pipe connected to a large end of the first reducer, and the second pipe portion includes a second reducer and a second circular pipe connected to a large end of the second reducer.

[0018] On the other hand, the present solution provides a production tubing, wherein the production tubing comprises an oil pipe and a bridge plug arranged on the oil pipe, and the bridge plug is the bridge plug described in the above solution.

[0019] Through the above technical scheme, the two expansion bodies can achieve one expansion by squeezing the cava through the gradually shrinking outer peripheral surface, and achieve another expansion of the cava through the expansion of the two expansion bodies themselves, thereby achieving two expansions of the cava, improving the expansion rate of the cava, and realizing extreme casing change sealing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the bridge plug in the implementation mode of the present scheme in the first working state;

[0021] Figure 2 yes Figure 1 A cross-sectional view of

[0022] Figure 3 is a structural schematic diagram of the bridge plug in the implementation mode of the present scheme in the second working state;

[0023] Figure 4 yes Figure 3 A cross-sectional view of

[0024] Figure 5 is a structural schematic diagram of the bridge plug in the implementation mode of the present scheme in the third working state;

[0025] Figure 6 yes Figure 5 sectional view of .

[0026] Description of Reference Numerals

[0027] 1-Cava, 11-tooth plate, 12-sealing ring, 2-first expansion body, 21-first support ring, 22-first main body, 3-second expansion body, 31-second support ring, 32-second main body, 4-first tube, 41-first circular tube, 42-first tapered tube, 5-second tube, 51-first circular tube, 52-second tapered tube. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] In the present invention, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the relative position relationship in the use state, but this is only to describe the present scheme more clearly and should not be understood as a special limitation on the present scheme.

[0030] Embodiment 1

[0031] refer to Figure 1-Figure 6As shown, the present scheme provides a bridge plug, wherein the bridge plug includes a cava 1, a first expansion body 2 having a tapered first outer peripheral surface, a second expansion body 3 having a tapered second outer peripheral surface, a first tube portion 4 having a tapered third outer peripheral surface and a second tube portion 5 having a tapered fourth outer peripheral surface, and the bridge plug can be configured as follows: the first expansion body 2 is inserted into the upper end of the cava 1, and the second expansion body 3 can be inserted into the lower end of the cava 1, so that the first outer peripheral surface and the second outer peripheral surface can squeeze the cava 1 so that the cava 1 undergoes a first radial expansion; the first tube portion 4 can be inserted into the first expansion body 2 and the second tube portion 5 can be inserted into the second expansion body 3, so that the first expansion body 2 and the second expansion body 3 can expand radially respectively, so that the cava 1 undergoes a second radial expansion.

[0032] The first expansion body 2 and the second expansion body 3 may be similar or identical structures, and are respectively formed into a tubular shape and have a tapered outer peripheral surface. The outer diameter of the small end of the first expansion body 2 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the first expansion body 2 is larger than the inner diameter of the slip 1. The outer diameter of the small end of the second expansion body 3 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the second expansion body 3 is larger than the inner diameter of the slip 1. Therefore, when the first expansion body 2 is inserted into the upper end of the slip 1 through its small end, a radially outward force can be applied to the inner peripheral surface of the slip 1 through the first outer peripheral surface of the first expansion body 2, so that the slip 1 expands radially outward. Similarly, when the second expansion body 3 is inserted into the lower end of the slip 1 through its small end, the slip 1 also expands radially outward. In other words, by inserting the first expansion body 2 and the second expansion body 3 into the two ends of the slip 1 respectively, the overall radial expansion of the slip 1 can be achieved.

[0033] The first tube portion 4 has a tapered outer circumferential surface, the second tube portion 5 has a tapered outer circumferential surface, the outer diameter of the small end of the first tube portion 4 is smaller than the inner diameter of the large end of the first expansion body 2, the outer diameter of the large end of the first tube portion 4 is larger than the inner diameter of the large end of the first expansion body 2, the outer diameter of the small end of the second tube portion 5 is smaller than the inner diameter of the large end of the second expansion body 3, and the outer diameter of the large end of the second tube portion 5 is larger than the inner diameter of the large end of the second expansion body 3. Correspondingly, during the process of inserting the small end of the first tube portion 4 into the large end of the first expansion body 2, the first tube portion 4 applies a radially outward extrusion force to the first expansion body 2, so that the first expansion body 2 expands radially outward, and the radial expansion of the first expansion body 2 causes the cava 1 to expand radially again; similarly, during the process of inserting the small end of the second tube portion 5 into the large end of the second expansion body 3, the second tube portion 5 applies a radially outward extrusion force to the second expansion body 3, so that the second expansion body 3 expands radially outward, and the radial expansion of the second expansion body 3 causes the cava 1 to expand radially again, therefore, the second radial expansion of the cava 1 can be achieved through the radial expansion of the first expansion body 2 and the second expansion body 3.

[0034] In this scheme, the two expansion bodies can achieve one expansion by squeezing the slips through the gradually shrinking outer peripheral surface, and achieve another expansion of the slips through the expansion of the two expansion bodies themselves, thereby achieving two expansions of the slips, improving the expansion rate of the slips, and realizing extreme casing change sealing operations.

[0035] Further, the bridge plug can be configured as follows: the first tube portion 4 pushes the first expansion body 2 to gradually insert into the upper end of the slip 1, and at the same time, the second tube portion 5 pushes the second expansion body 3 to gradually insert into the lower end of the slip 1, so that the slip 1 first performs the first radial expansion, and then performs the second radial expansion. That is to say, the insertion of the first expansion body 2 into the slip 1 is achieved by the push of the first tube portion 4, and the insertion of the second expansion body 3 into the lower end of the slip 1 is achieved by the push of the second tube portion 5. It is only necessary to insert the first tube portion 4 into the first expansion body 2 and the second expansion body 2 into the slip 1, and then push the first tube portion 4, and on the other hand, insert the second tube portion 5 into the second expansion body 3 and the second expansion body 3 into the slip 1, and then push the second tube portion 5, so that the two expansions of the slip 1 can be achieved in sequence. Of course, in other embodiments, the two expansion bodies can be respectively inserted into the slip 1 to achieve the first expansion, and then the two tube portions can be respectively inserted to achieve the second expansion of the slip 1.

[0036] In addition, the force required for the radial expansion of the first expansion body 2 and the force required for the radial expansion of the second expansion body 3 are respectively greater than the force required for the radial expansion of the slip 1. The extrusion force required for the slip 1 to start expanding is less than the extrusion force required for the first expansion body 2 to expand and the extrusion force required for the second expansion body 3 to expand. When the first tube 4 is inserted into the first expansion body 2 and the second expansion body 2 is inserted into the slip 1, the force of the first tube 4 on the second expansion body 2 is transmitted to the slip 1, so that the slip 1 will first start to expand. As the first tube 4 is gradually inserted into the second expansion body 2, its extrusion force increases. When the force required for the expansion of the first expansion body 2 is reached, the second expansion body 2 starts to expand. That is to say, when the first tube 4 is gradually inserted into the first expansion body 2, the second expansion body 2 is also gradually inserted into the slip 1, first realizing the first radial expansion of the slip 1, and then realizing the second radial expansion of the slip 1 through the expansion of the second expansion body 2. The second expansion body 3 and the second tube 5 are also similarly configured, and will not be repeated here.

[0037] The first expansion body 2 includes a tapered first main body 22 and a first support ring 21 connected to the large end of the first main body 22, and the second expansion body 3 includes a tapered second main body 32 and a second support ring 31 connected to the large end of the second main body 32. The small end of the first main body 22 is used to be inserted into the upper end of the slip 1, and the small end of the second main body 32 is used to be inserted into the lower end of the slip 1. The first support ring 21 is connected to the large end of the first main body 22 and can allow the first pipe 4 to be inserted, and the second support ring 31 is connected to the large end of the second main body 32 and can allow the second pipe 5 to be inserted.

[0038] Furthermore, the force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1, and the force required for the second support ring 31 to break is greater than the force required for the radial expansion of the slip 1. The first support ring 21 is configured as a structure that limits the first expansion body 2 from starting to expand, that is, the first support ring 21 needs to be broken first, and the extrusion force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1. Therefore, in the process of inserting the first expansion body 2 into the first tube 4 and the second expansion body 2 into the slip 1, the slip 1 starts to expand first, and then the first tube 4 squeezes the first support ring 21 to break, and the first main body 22 starts to expand to act on the slip 1 to achieve its second radial expansion. The second expansion body 3 and the second tube 5 are also configured similarly, and will not be repeated here.

[0039] The first main body 22 includes a plurality of first expansion plates arranged circumferentially, and the second main body 32 includes a plurality of second expansion plates arranged circumferentially. The first expansion plates are arranged circumferentially, and when the first expansion body 2 expands radially, the circumferential spacing between adjacent first expansion plates increases, so that the first main body 22 can be expanded and deployed; similarly, the second expansion plates are arranged circumferentially, and when the second expansion body 3 expands radially, the circumferential spacing between adjacent second expansion plates increases, so that the second main body 32 can be expanded and deployed.

[0040] Among them, the first expansion plate is integrally connected to the first support ring 21, and the second expansion plate is integrally connected to the second support ring 31. A plurality of first expansion plates and the first support ring 21 are integrally connected to form a whole, and when the first support ring 21 is broken into a plurality of circumferentially arranged parts, the plurality of first expansion plates can be allowed to expand away from each other; similarly, a plurality of second expansion plates and the second support ring 31 are integrally connected to form a whole, and when the second support ring 31 is broken into a plurality of circumferentially arranged parts, the plurality of second expansion plates can be allowed to expand away from each other. Further, a plurality of pre-breaking points can be set on the first support ring 21, so that it can be broken into a plurality of parts corresponding to the plurality of first expansion plates, and a plurality of pre-breaking points can be set on the second support ring 31, so that it can be broken into a plurality of parts corresponding to the plurality of second expansion plates.

[0041] The slip 1 includes a plurality of tooth plates 11 arranged circumferentially. During the expansion of the slip 1, the circumferential spacing of the plurality of tooth plates 11 increases to achieve radial expansion. The outer surface of the tooth plate 11 may be provided with a slip tooth, so that the slip tooth can be engaged with the inner circumferential surface of the sleeve.

[0042] In addition, the slip 1 includes sealing rings 12 connected to both ends of the tooth plate 11. The sealing ring 12 is made of a sealing material, which can be a plastic material or an elastic material. When the tooth plate 11 expands and expands, the sealing ring 12 also expands, and the outer circumference of the sealing ring 12 can fit the inner circumference of the casing to form a seal.

[0043] Furthermore, the number of the tooth plates 11, the number of the first expansion plates and the number of the second expansion plates are the same. The first expansion plates can correspond to the tooth plates 11 one by one, and the second expansion plates can correspond to the tooth plates 11 one by one, that is, radial alignment is convenient for synchronous radial outward expansion, and the circumferential relative displacement of the first expansion plates, the second expansion plates and the tooth plates 11 is reduced. Among them, the tooth plates 11, the first expansion plates and the second expansion plates can be set to 6 respectively.

[0044] Furthermore, the inner surface of the tooth plate 11 is provided with a first limiting groove, and the outer surface of the first expansion plate is provided with a first limiting strip, and the first limiting groove can respectively guide the first limiting strip to move axially. The first limiting groove extends along the axial direction, and the first limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the first expansion body 2 is inserted into the slip 1, the first limiting strip can be made to correspond to the first limiting groove, so that the first limiting strip is inserted into the first limiting groove. Through the mutual cooperation of the first limiting strip and the first limiting groove, the relative rotation of the first expansion body and the slip 1 can be limited, thereby improving reliability.

[0045] Furthermore, the inner surface of the tooth plate 11 is provided with a second limiting groove, and the outer surface of the second expansion plate is provided with a second limiting strip, and the second limiting groove can guide the second limiting strip to move axially. The second limiting groove extends along the axial direction, and the second limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the second expansion body 3 is inserted into the slip 1, the second limiting strip can be made to correspond to the second limiting groove, so that the second limiting strip is inserted into the second limiting groove. Through the mutual cooperation of the second limiting strip and the second limiting groove, the relative rotation of the second expansion body and the slip 1 can be limited, thereby improving reliability.

[0046] A ball pitching seat is provided at the upper end of the first tube 4. The ball pitching seat can carry a ball thrown into it to achieve corresponding operations.

[0047] In some embodiments, the first pipe portion 4 includes a first reducer 42 and a first circular pipe 41 connected to the large end of the first reducer 42, and the second pipe portion 5 includes a second reducer 52 and a second circular pipe 51 connected to the large end of the second reducer 52. The pitching seat described above may be provided in the first circular pipe 41. The first circular pipe 41 may be used to connect to other pipe fittings, and the second circular pipe 51 may be connected to other pipe fittings.

[0048] Regarding the overall structure of the bridge plug, except for the slip teeth (roughly cylindrical) on the outer surface of the tooth plate 11, the remaining structures are made of soluble materials, that is, the bridge plug is basically soluble and is a soluble bridge plug.

[0049] In some embodiments, the outer diameter of the slip 1 is 60 mm, and after the first expansion, the outer diameter expands to 90 mm, with an expansion rate of 50%, and after the second expansion, the outer diameter expands to 114.3 mm, with an expansion rate of 40.5%, and the total expansion rate is 85.7%.

[0050] Embodiment 2

[0051] refer to Figure 1-Figure 6 As shown, the present scheme provides a bridge plug, wherein the bridge plug includes a cava 1, a first expansion body 2 having a tapered first outer peripheral surface, a second expansion body 3 having a tapered second outer peripheral surface, a first tube portion 4 having a tapered third outer peripheral surface and a second tube portion 5 having a tapered fourth outer peripheral surface, and the bridge plug can be configured as follows: the first expansion body 2 is inserted into the upper end of the cava 1, and the second expansion body 3 can be inserted into the lower end of the cava 1, so that the first outer peripheral surface and the second outer peripheral surface can squeeze the cava 1 so that the cava 1 undergoes a first radial expansion; the first tube portion 4 can be inserted into the first expansion body 2 and the second tube portion 5 can be inserted into the second expansion body 3, so that the first expansion body 2 and the second expansion body 3 can expand radially respectively, so that the cava 1 undergoes a second radial expansion.

[0052] The first expansion body 2 and the second expansion body 3 may be similar or identical structures, and are respectively formed into a tubular shape and have a tapered outer peripheral surface. The outer diameter of the small end of the first expansion body 2 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the first expansion body 2 is larger than the inner diameter of the slip 1. The outer diameter of the small end of the second expansion body 3 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the second expansion body 3 is larger than the inner diameter of the slip 1. Therefore, when the first expansion body 2 is inserted into the upper end of the slip 1 through its small end, a radially outward force can be applied to the inner peripheral surface of the slip 1 through the first outer peripheral surface of the first expansion body 2, so that the slip 1 expands radially outward. Similarly, when the second expansion body 3 is inserted into the lower end of the slip 1 through its small end, the slip 1 also expands radially outward. In other words, by inserting the first expansion body 2 and the second expansion body 3 into the two ends of the slip 1 respectively, the overall radial expansion of the slip 1 can be achieved.

[0053] The first tube portion 4 has a tapered outer circumferential surface, the second tube portion 5 has a tapered outer circumferential surface, the outer diameter of the small end of the first tube portion 4 is smaller than the inner diameter of the large end of the first expansion body 2, the outer diameter of the large end of the first tube portion 4 is larger than the inner diameter of the large end of the first expansion body 2, the outer diameter of the small end of the second tube portion 5 is smaller than the inner diameter of the large end of the second expansion body 3, and the outer diameter of the large end of the second tube portion 5 is larger than the inner diameter of the large end of the second expansion body 3. Correspondingly, during the process of inserting the small end of the first tube portion 4 into the large end of the first expansion body 2, the first tube portion 4 applies a radially outward extrusion force to the first expansion body 2, so that the first expansion body 2 expands radially outward, and the radial expansion of the first expansion body 2 causes the cava 1 to expand radially again; similarly, during the process of inserting the small end of the second tube portion 5 into the large end of the second expansion body 3, the second tube portion 5 applies a radially outward extrusion force to the second expansion body 3, so that the second expansion body 3 expands radially outward, and the radial expansion of the second expansion body 3 causes the cava 1 to expand radially again, therefore, the second radial expansion of the cava 1 can be achieved through the radial expansion of the first expansion body 2 and the second expansion body 3.

[0054] In this scheme, the two expansion bodies can achieve one expansion by squeezing the slips through the gradually shrinking outer peripheral surface, and achieve another expansion of the slips through the expansion of the two expansion bodies themselves, thereby achieving two expansions of the slips, improving the expansion rate of the slips, and realizing extreme casing change sealing operations.

[0055] Further, the bridge plug can be configured as follows: the first tube portion 4 pushes the first expansion body 2 to gradually insert into the upper end of the slip 1, and at the same time, the second tube portion 5 pushes the second expansion body 3 to gradually insert into the lower end of the slip 1, so that the slip 1 first performs the first radial expansion, and then performs the second radial expansion. That is to say, the insertion of the first expansion body 2 into the slip 1 is achieved by the push of the first tube portion 4, and the insertion of the second expansion body 3 into the lower end of the slip 1 is achieved by the push of the second tube portion 5. It is only necessary to insert the first tube portion 4 into the first expansion body 2 and the second expansion body 2 into the slip 1, and then push the first tube portion 4, and on the other hand, insert the second tube portion 5 into the second expansion body 3 and the second expansion body 3 into the slip 1, and then push the second tube portion 5, so that the two expansions of the slip 1 can be achieved in sequence. Of course, in other embodiments, the two expansion bodies can be respectively inserted into the slip 1 to achieve the first expansion, and then the two tube portions can be respectively inserted to achieve the second expansion of the slip 1.

[0056] In addition, the force required for the radial expansion of the first expansion body 2 and the force required for the radial expansion of the second expansion body 3 are respectively greater than the force required for the radial expansion of the slip 1. The extrusion force required for the slip 1 to start expanding is less than the extrusion force required for the first expansion body 2 to expand and the extrusion force required for the second expansion body 3 to expand. When the first tube 4 is inserted into the first expansion body 2 and the second expansion body 2 is inserted into the slip 1, the force of the first tube 4 on the second expansion body 2 is transmitted to the slip 1, so that the slip 1 will first start to expand. As the first tube 4 is gradually inserted into the second expansion body 2, its extrusion force increases. When the force required for the expansion of the first expansion body 2 is reached, the second expansion body 2 starts to expand. That is to say, when the first tube 4 is gradually inserted into the first expansion body 2, the second expansion body 2 is also gradually inserted into the slip 1, first realizing the first radial expansion of the slip 1, and then realizing the second radial expansion of the slip 1 through the expansion of the second expansion body 2. The second expansion body 3 and the second tube 5 are also similarly configured, and will not be repeated here.

[0057] The first expansion body 2 includes a tapered first main body 22 and a first support ring 21 connected to the large end of the first main body 22, and the second expansion body 3 includes a tapered second main body 32 and a second support ring 31 connected to the large end of the second main body 32. The small end of the first main body 22 is used to be inserted into the upper end of the slip 1, and the small end of the second main body 32 is used to be inserted into the lower end of the slip 1. The first support ring 21 is connected to the large end of the first main body 22 and can allow the first pipe 4 to be inserted, and the second support ring 31 is connected to the large end of the second main body 32 and can allow the second pipe 5 to be inserted.

[0058] Furthermore, the force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1, and the force required for the second support ring 31 to break is greater than the force required for the radial expansion of the slip 1. The first support ring 21 is configured as a structure that limits the first expansion body 2 from starting to expand, that is, the first support ring 21 needs to be broken first, and the extrusion force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1. Therefore, in the process of inserting the first expansion body 2 into the first tube 4 and the second expansion body 2 into the slip 1, the slip 1 starts to expand first, and then the first tube 4 squeezes the first support ring 21 to break, and the first main body 22 starts to expand to act on the slip 1 to achieve its second radial expansion. The second expansion body 3 and the second tube 5 are also configured similarly, and will not be repeated here.

[0059] The first main body 22 includes a plurality of first expansion plates arranged circumferentially, and the second main body 32 includes a plurality of second expansion plates arranged circumferentially. The first expansion plates are arranged circumferentially, and when the first expansion body 2 expands radially, the circumferential spacing between adjacent first expansion plates increases, so that the first main body 22 can be expanded and deployed; similarly, the second expansion plates are arranged circumferentially, and when the second expansion body 3 expands radially, the circumferential spacing between adjacent second expansion plates increases, so that the second main body 32 can be expanded and deployed.

[0060] Among them, the first expansion plate is integrally connected to the first support ring 21, and the second expansion plate is integrally connected to the second support ring 31. A plurality of first expansion plates and the first support ring 21 are integrally connected to form a whole, and when the first support ring 21 is broken into a plurality of circumferentially arranged parts, the plurality of first expansion plates can be allowed to expand away from each other; similarly, a plurality of second expansion plates and the second support ring 31 are integrally connected to form a whole, and when the second support ring 31 is broken into a plurality of circumferentially arranged parts, the plurality of second expansion plates can be allowed to expand away from each other. Further, a plurality of pre-breaking points can be set on the first support ring 21, so that it can be broken into a plurality of parts corresponding to the plurality of first expansion plates, and a plurality of pre-breaking points can be set on the second support ring 31, so that it can be broken into a plurality of parts corresponding to the plurality of second expansion plates.

[0061] The slip 1 includes a plurality of tooth plates 11 arranged circumferentially. During the expansion of the slip 1, the circumferential spacing of the plurality of tooth plates 11 increases to achieve radial expansion. The outer surface of the tooth plate 11 may be provided with a slip tooth, so that the slip tooth can be engaged with the inner circumferential surface of the sleeve.

[0062] In addition, the slip 1 includes sealing rings 12 connected to both ends of the tooth plate 11. The sealing ring 12 is made of a sealing material, which can be a plastic material or an elastic material. When the tooth plate 11 expands and expands, the sealing ring 12 also expands, and the outer circumference of the sealing ring 12 can fit the inner circumference of the casing to form a seal.

[0063] Furthermore, the number of the tooth plates 11, the number of the first expansion plates and the number of the second expansion plates are the same. The first expansion plates can correspond to the tooth plates 11 one by one, and the second expansion plates can correspond to the tooth plates 11 one by one, that is, radial alignment is convenient for synchronous radial outward expansion, and the circumferential relative displacement of the first expansion plates, the second expansion plates and the tooth plates 11 is reduced. Among them, the tooth plates 11, the first expansion plates and the second expansion plates can be set to 7 respectively.

[0064] Furthermore, the inner surface of the tooth plate 11 is provided with a first limiting groove, and the outer surface of the first expansion plate is provided with a first limiting strip, and the first limiting groove can respectively guide the first limiting strip to move axially. The first limiting groove extends along the axial direction, and the first limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the first expansion body 2 is inserted into the slip 1, the first limiting strip can be made to correspond to the first limiting groove, so that the first limiting strip is inserted into the first limiting groove. Through the mutual cooperation of the first limiting strip and the first limiting groove, the relative rotation of the first expansion body and the slip 1 can be limited, thereby improving reliability.

[0065] Furthermore, the inner surface of the tooth plate 11 is provided with a second limiting groove, and the outer surface of the second expansion plate is provided with a second limiting strip, and the second limiting groove can guide the second limiting strip to move axially. The second limiting groove extends along the axial direction, and the second limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the second expansion body 3 is inserted into the slip 1, the second limiting strip can be made to correspond to the second limiting groove, so that the second limiting strip is inserted into the second limiting groove. Through the mutual cooperation of the second limiting strip and the second limiting groove, the relative rotation of the second expansion body and the slip 1 can be limited, thereby improving reliability.

[0066] A ball pitching seat is provided at the upper end of the first tube 4. The ball pitching seat can carry a ball thrown into it to achieve corresponding operations.

[0067] In some embodiments, the first pipe portion 4 includes a first reducer 42 and a first circular pipe 41 connected to the large end of the first reducer 42, and the second pipe portion 5 includes a second reducer 52 and a second circular pipe 51 connected to the large end of the second reducer 52. The pitching seat described above may be provided in the first circular pipe 41. The first circular pipe 41 may be used to connect to other pipe fittings, and the second circular pipe 51 may be connected to other pipe fittings.

[0068] Regarding the overall structure of the bridge plug, except for the slip teeth (roughly cylindrical) on the outer surface of the tooth plate 11, the remaining structures are made of soluble materials, that is, the bridge plug is basically soluble and is a soluble bridge plug.

[0069] In some embodiments, the outer diameter of the slip 1 is 60 mm, and after the first expansion, the outer diameter expands to 90 mm, with an expansion rate of 50%, and after the second expansion, the outer diameter expands to 114.3 mm, with an expansion rate of 40.5%, and the total expansion rate is 85.7%.

[0070] Embodiment 3

[0071] refer to Figure 1-Figure 6 As shown, the present scheme provides a bridge plug, wherein the bridge plug includes a cava 1, a first expansion body 2 having a tapered first outer peripheral surface, a second expansion body 3 having a tapered second outer peripheral surface, a first tube portion 4 having a tapered third outer peripheral surface and a second tube portion 5 having a tapered fourth outer peripheral surface, and the bridge plug can be configured as follows: the first expansion body 2 is inserted into the upper end of the cava 1, and the second expansion body 3 can be inserted into the lower end of the cava 1, so that the first outer peripheral surface and the second outer peripheral surface can squeeze the cava 1 so that the cava 1 undergoes a first radial expansion; the first tube portion 4 can be inserted into the first expansion body 2 and the second tube portion 5 can be inserted into the second expansion body 3, so that the first expansion body 2 and the second expansion body 3 can expand radially respectively, so that the cava 1 undergoes a second radial expansion.

[0072] The first expansion body 2 and the second expansion body 3 may be similar or identical structures, and are respectively formed into a tubular shape and have a tapered outer peripheral surface. The outer diameter of the small end of the first expansion body 2 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the first expansion body 2 is larger than the inner diameter of the slip 1. The outer diameter of the small end of the second expansion body 3 is smaller than the inner diameter of the slip 1, while the outer diameter of the large end of the second expansion body 3 is larger than the inner diameter of the slip 1. Therefore, when the first expansion body 2 is inserted into the upper end of the slip 1 through its small end, a radially outward force can be applied to the inner peripheral surface of the slip 1 through the first outer peripheral surface of the first expansion body 2, so that the slip 1 expands radially outward. Similarly, when the second expansion body 3 is inserted into the lower end of the slip 1 through its small end, the slip 1 also expands radially outward. In other words, by inserting the first expansion body 2 and the second expansion body 3 into the two ends of the slip 1 respectively, the overall radial expansion of the slip 1 can be achieved.

[0073] The first tube portion 4 has a tapered outer circumferential surface, the second tube portion 5 has a tapered outer circumferential surface, the outer diameter of the small end of the first tube portion 4 is smaller than the inner diameter of the large end of the first expansion body 2, the outer diameter of the large end of the first tube portion 4 is larger than the inner diameter of the large end of the first expansion body 2, the outer diameter of the small end of the second tube portion 5 is smaller than the inner diameter of the large end of the second expansion body 3, and the outer diameter of the large end of the second tube portion 5 is larger than the inner diameter of the large end of the second expansion body 3. Correspondingly, during the process of inserting the small end of the first tube portion 4 into the large end of the first expansion body 2, the first tube portion 4 applies a radially outward extrusion force to the first expansion body 2, so that the first expansion body 2 expands radially outward, and the radial expansion of the first expansion body 2 causes the cava 1 to expand radially again; similarly, during the process of inserting the small end of the second tube portion 5 into the large end of the second expansion body 3, the second tube portion 5 applies a radially outward extrusion force to the second expansion body 3, so that the second expansion body 3 expands radially outward, and the radial expansion of the second expansion body 3 causes the cava 1 to expand radially again, therefore, the second radial expansion of the cava 1 can be achieved through the radial expansion of the first expansion body 2 and the second expansion body 3.

[0074] In this scheme, the two expansion bodies can achieve one expansion by squeezing the slips through the gradually shrinking outer peripheral surface, and achieve another expansion of the slips through the expansion of the two expansion bodies themselves, thereby achieving two expansions of the slips, improving the expansion rate of the slips, and realizing extreme casing change sealing operations.

[0075] Further, the bridge plug can be configured as follows: the first tube portion 4 pushes the first expansion body 2 to gradually insert into the upper end of the slip 1, and at the same time, the second tube portion 5 pushes the second expansion body 3 to gradually insert into the lower end of the slip 1, so that the slip 1 first performs the first radial expansion, and then performs the second radial expansion. That is to say, the insertion of the first expansion body 2 into the slip 1 is achieved by the push of the first tube portion 4, and the insertion of the second expansion body 3 into the lower end of the slip 1 is achieved by the push of the second tube portion 5. It is only necessary to insert the first tube portion 4 into the first expansion body 2 and the second expansion body 2 into the slip 1, and then push the first tube portion 4, and on the other hand, insert the second tube portion 5 into the second expansion body 3 and the second expansion body 3 into the slip 1, and then push the second tube portion 5, so that the two expansions of the slip 1 can be achieved in sequence. Of course, in other embodiments, the two expansion bodies can be respectively inserted into the slip 1 to achieve the first expansion, and then the two tube portions can be respectively inserted to achieve the second expansion of the slip 1.

[0076] In addition, the force required for the radial expansion of the first expansion body 2 and the force required for the radial expansion of the second expansion body 3 are respectively greater than the force required for the radial expansion of the slip 1. The extrusion force required for the slip 1 to start expanding is less than the extrusion force required for the first expansion body 2 to expand and the extrusion force required for the second expansion body 3 to expand. When the first tube 4 is inserted into the first expansion body 2 and the second expansion body 2 is inserted into the slip 1, the force of the first tube 4 on the second expansion body 2 is transmitted to the slip 1, so that the slip 1 will first start to expand. As the first tube 4 is gradually inserted into the second expansion body 2, its extrusion force increases. When the force required for the expansion of the first expansion body 2 is reached, the second expansion body 2 starts to expand. That is to say, when the first tube 4 is gradually inserted into the first expansion body 2, the second expansion body 2 is also gradually inserted into the slip 1, first realizing the first radial expansion of the slip 1, and then realizing the second radial expansion of the slip 1 through the expansion of the second expansion body 2. The second expansion body 3 and the second tube 5 are also similarly configured, and will not be repeated here.

[0077] The first expansion body 2 includes a tapered first main body 22 and a first support ring 21 connected to the large end of the first main body 22, and the second expansion body 3 includes a tapered second main body 32 and a second support ring 31 connected to the large end of the second main body 32. The small end of the first main body 22 is used to be inserted into the upper end of the slip 1, and the small end of the second main body 32 is used to be inserted into the lower end of the slip 1. The first support ring 21 is connected to the large end of the first main body 22 and can allow the first pipe 4 to be inserted, and the second support ring 31 is connected to the large end of the second main body 32 and can allow the second pipe 5 to be inserted.

[0078] Furthermore, the force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1, and the force required for the second support ring 31 to break is greater than the force required for the radial expansion of the slip 1. The first support ring 21 is configured as a structure that limits the first expansion body 2 from starting to expand, that is, the first support ring 21 needs to be broken first, and the extrusion force required for the first support ring 21 to break is greater than the force required for the radial expansion of the slip 1. Therefore, in the process of inserting the first expansion body 2 into the first tube 4 and the second expansion body 2 into the slip 1, the slip 1 starts to expand first, and then the first tube 4 squeezes the first support ring 21 to break, and the first main body 22 starts to expand to act on the slip 1 to achieve its second radial expansion. The second expansion body 3 and the second tube 5 are also configured similarly, and will not be repeated here.

[0079] The first main body 22 includes a plurality of first expansion plates arranged circumferentially, and the second main body 32 includes a plurality of second expansion plates arranged circumferentially. The first expansion plates are arranged circumferentially, and when the first expansion body 2 expands radially, the circumferential spacing between adjacent first expansion plates increases, so that the first main body 22 can be expanded and deployed; similarly, the second expansion plates are arranged circumferentially, and when the second expansion body 3 expands radially, the circumferential spacing between adjacent second expansion plates increases, so that the second main body 32 can be expanded and deployed.

[0080] Among them, the first expansion plate is integrally connected to the first support ring 21, and the second expansion plate is integrally connected to the second support ring 31. A plurality of first expansion plates and the first support ring 21 are integrally connected to form a whole, and when the first support ring 21 is broken into a plurality of circumferentially arranged parts, the plurality of first expansion plates can be allowed to expand away from each other; similarly, a plurality of second expansion plates and the second support ring 31 are integrally connected to form a whole, and when the second support ring 31 is broken into a plurality of circumferentially arranged parts, the plurality of second expansion plates can be allowed to expand away from each other. Further, a plurality of pre-breaking points can be set on the first support ring 21, so that it can be broken into a plurality of parts corresponding to the plurality of first expansion plates, and a plurality of pre-breaking points can be set on the second support ring 31, so that it can be broken into a plurality of parts corresponding to the plurality of second expansion plates.

[0081] The slip 1 includes a plurality of tooth plates 11 arranged circumferentially. During the expansion of the slip 1, the circumferential spacing of the plurality of tooth plates 11 increases to achieve radial expansion. The outer surface of the tooth plate 11 may be provided with a slip tooth, so that the slip tooth can be engaged with the inner circumferential surface of the sleeve.

[0082] In addition, the slip 1 includes sealing rings 12 connected to both ends of the tooth plate 11. The sealing ring 12 is made of a sealing material, which can be a plastic material or an elastic material. When the tooth plate 11 expands and expands, the sealing ring 12 also expands, and the outer circumference of the sealing ring 12 can fit the inner circumference of the casing to form a seal.

[0083] Furthermore, the number of the tooth plates 11, the number of the first expansion plates and the number of the second expansion plates are the same. The first expansion plates can correspond to the tooth plates 11 one by one, and the second expansion plates can correspond to the tooth plates 11 one by one, that is, radial alignment is convenient for synchronous radial outward expansion, and the circumferential relative displacement of the first expansion plates, the second expansion plates and the tooth plates 11 is reduced. Among them, the tooth plates 11, the first expansion plates and the second expansion plates can be set to 8 respectively.

[0084] Furthermore, the inner surface of the tooth plate 11 is provided with a first limiting groove, and the outer surface of the first expansion plate is provided with a first limiting strip, and the first limiting groove can respectively guide the first limiting strip to move axially. The first limiting groove extends along the axial direction, and the first limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the first expansion body 2 is inserted into the slip 1, the first limiting strip can be made to correspond to the first limiting groove, so that the first limiting strip is inserted into the first limiting groove. Through the mutual cooperation of the first limiting strip and the first limiting groove, the relative rotation of the first expansion body and the slip 1 can be limited, thereby improving reliability.

[0085] Furthermore, the inner surface of the tooth plate 11 is provided with a second limiting groove, and the outer surface of the second expansion plate is provided with a second limiting strip, and the second limiting groove can guide the second limiting strip to move axially. The second limiting groove extends along the axial direction, and the second limiting strip also extends roughly along the axial direction. Of course, there is a certain angle between the extension direction and the axial direction. When the second expansion body 3 is inserted into the slip 1, the second limiting strip can be made to correspond to the second limiting groove, so that the second limiting strip is inserted into the second limiting groove. Through the mutual cooperation of the second limiting strip and the second limiting groove, the relative rotation of the second expansion body and the slip 1 can be limited, thereby improving reliability.

[0086] A ball pitching seat is provided at the upper end of the first tube 4. The ball pitching seat can carry a ball thrown into it to achieve corresponding operations.

[0087] In some embodiments, the first pipe portion 4 includes a first reducer 42 and a first circular pipe 41 connected to the large end of the first reducer 42, and the second pipe portion 5 includes a second reducer 52 and a second circular pipe 51 connected to the large end of the second reducer 52. The pitching seat described above may be provided in the first circular pipe 41. The first circular pipe 41 may be used to connect to other pipe fittings, and the second circular pipe 51 may be connected to other pipe fittings.

[0088] Regarding the overall structure of the bridge plug, except for the slip teeth (roughly cylindrical) on the outer surface of the tooth plate 11, the remaining structures are made of soluble materials, that is, the bridge plug is basically soluble and is a soluble bridge plug.

[0089] In some embodiments, the outer diameter of the slip 1 is 60 mm, and after the first expansion, the outer diameter expands to 90 mm, with an expansion rate of 50%, and after the second expansion, the outer diameter expands to 114.3 mm, with an expansion rate of 40.5%, and the total expansion rate is 85.7%.

[0090] In addition, the present solution also provides a production string, wherein the production string comprises an oil pipe and a bridge plug arranged on the oil pipe, wherein the bridge plug is the bridge plug described in the above solution. The bridge plug can be set on the inner wall of the casing through the secondary expansion of the slip 1.

[0091] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A bridge plug, characterized in that: The bridge plug comprises a slip (1), a first expansion body (2) having a first tapered outer peripheral surface, a second expansion body (3) having a second tapered outer peripheral surface, a first pipe portion (4) having a third tapered outer peripheral surface, and a second pipe portion (5) having a fourth tapered outer peripheral surface. The bridge plug can be configured as follows: the first expansion body (2) is inserted into the upper end of the slip (1), and the second expansion body (3) is inserted into the lower end of the slip (1), so that the first outer peripheral surface and the second outer peripheral surface can squeeze the slip (1) to cause the slip (1) to undergo a first radial expansion; the first pipe portion (4) is inserted into the first expansion body (2) and the second pipe portion (5) is inserted into the second expansion body (3), so that the first expansion body (2) and the second expansion body (3) can expand radially respectively, so that the slip (1) undergoes a second radial expansion.

2. The bridge plug according to claim 1, characterized in that: The bridge plug can be configured such that: the first pipe portion (4) pushes the first expansion body (2) to gradually insert into the upper end of the slip (1), and at the same time the second pipe portion (5) pushes the second expansion body (3) to gradually insert into the lower end of the slip (1), so that the slip (1) first performs the first radial expansion and then performs the second radial expansion.

3. The bridge plug according to claim 2, characterized in that: The force required for radial expansion of the first expansion body (2) and the force required for radial expansion of the second expansion body (3) are respectively greater than the force required for radial expansion of the slip (1).

4. The bridge plug according to claim 3, characterized in that: The first expansion body (2) comprises a tapered first main body portion (22) and a first support ring (21) connected to the large end of the first main body portion (22), and the second expansion body (3) comprises a tapered second main body portion (32) and a second support ring (31) connected to the large end of the second main body portion (32).

5. The bridge plug according to claim 4, characterized in that: The force required for the first support ring (21) to break is greater than the force required for the slip (1) to expand radially, and the force required for the second support ring (31) to break is greater than the force required for the slip (1) to expand radially.

6. The bridge plug according to claim 4, characterized in that: The first main body portion (22) includes a plurality of first expansion plates arranged in a circumferential direction, and the second main body portion (32) includes a plurality of second expansion plates arranged in a circumferential direction.

7. The bridge plug according to claim 6, characterized in that: The first expansion plate is integrally connected to the first support ring (21), and the second expansion plate is integrally connected to the second support ring (31).

8. The bridge plug according to claim 7, characterized in that: The slip (1) comprises a plurality of tooth plates (11) arranged circumferentially.

9. The bridge plug according to claim 8, characterized in that: The slip (1) comprises sealing rings (12) connected to both ends of the tooth plate (11).

10. The bridge plug according to claim 9, characterized in that The number of the tooth plates (11), the number of the first expansion plates and the number of the second expansion plates are the same.

11. The bridge plug according to claim 9, characterized in that The inner surface of the tooth plate (11) is provided with a first limiting groove, and the outer surface of the first expansion plate is provided with a first limiting strip, and the first limiting grooves can respectively guide the first limiting strip to move axially.

12. The bridge plug according to claim 9, characterized in that The inner surface of the tooth plate (11) is provided with a second limiting groove, and the outer surface of the second expansion plate is provided with a second limiting strip, wherein the second limiting groove can guide the second limiting strip to move axially.

13. The bridge plug according to claim 1, characterized in that A ball pitching seat is provided at the upper end of the first pipe part (4).

14. The bridge plug according to claim 1, characterized in that The first pipe portion (4) comprises a first reducer (42) and a first circular pipe (41) connected to the large end of the first reducer (42), and the second pipe portion (5) comprises a second reducer (52) and a second circular pipe (51) connected to the large end of the second reducer (52).

15. A production string, characterized in that: The production tubing string comprises an oil pipe and a bridge plug arranged on the oil pipe, and the bridge plug is the bridge plug according to any one of claims 1 to 14.

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