CN111502595A - All-metal sealing soluble bridge plug - Google Patents
All-metal sealing soluble bridge plug Download PDFInfo
- Publication number
- CN111502595A CN111502595A CN202010349170.6A CN202010349170A CN111502595A CN 111502595 A CN111502595 A CN 111502595A CN 202010349170 A CN202010349170 A CN 202010349170A CN 111502595 A CN111502595 A CN 111502595A
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- Prior art keywords
- piston
- tube
- central
- central tube
- pipe
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims description 14
- 230000000670 limiting effect Effects 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the field of downhole tools in oil fields, and particularly relates to an all-metal sealed soluble bridge plug which comprises a central tube, wherein an upper outer tube and a lower outer tube are sequentially sleeved on the central tube, an annular space is reserved between the upper outer tube and the central tube, an upper piston and a lower piston are arranged in the annular space and respectively comprise a piston A and a piston B, the piston A is fixedly and hermetically connected with the central tube and is in sliding and sealing connection with the upper outer tube, the inner side of the upper outer tube of a piston B section is provided with an expanding step which limits the piston B, the piston B is in sliding and sealing connection with the upper outer tube, and the piston B is in sliding and sealing connection with the central tube, so that the piston A, the piston B, the central tube and the upper outer tube enclose a gas chamber which is called as an upper gas chamber, the two air cavities are compressed by strong underground hydraulic pressure, so that reverse acting force is generated to seat the bridge plug.
Description
Technical Field
The invention belongs to the field of oil field downhole tools, and particularly relates to an all-metal sealing soluble bridge plug.
Background
Bridge plugs are downhole tools used in horizontal well staged fracturing techniques to temporarily pack off wellbores. Depending on the manner of unsealing, bridge plugs can be classified into retrievable, drillable and dissolvable bridge plugs. The fishing cost of the removable bridge plug is high, and the failure risk is large; when the amount of chips generated during drilling and milling of the drillable bridge plug is large, the chips are accumulated to block the casing pipe, and the subsequent operation is adversely affected; the soluble bridge plug is a novel bridge plug made of magnesium aluminum alloy, and can be automatically dissolved in a certain liquid environment after fracturing operation is completed, so that full-drift-diameter production of a shaft is realized.
In the prior art, a rubber cylinder in a bridge plug is thick, and the diameter of the bridge plug is fixed, so that the rubber cylinder seriously restricts the expansion of the drift diameter of the bridge plug, and further limits the performance of the bridge plug; in addition, a special setting tool for the bridge plug is required to be connected above the bridge plug when the bridge plug is installed, the length of a tool section formed by integrally connecting the setting tool and the bridge plug is long, and the problem of clamping stagnation is easily caused in the process of descending a well. There is therefore a need for a dissolvable bridge plug that does not require a setting tool.
Disclosure of Invention
The invention provides an all-metal seal soluble bridge plug, which aims to solve the problems that the expansion of the drift diameter of a bridge plug is influenced by the thicker sealing component of the bridge plug in the background technology and a pipe column is too long due to the fact that a setting tool is needed for setting the bridge plug in the background technology.
The technical scheme provided by the invention is as follows: the utility model provides an all-metal seal soluble bridging plug, includes center tube, centrum and slips, center tube and centrum threaded connection, the slips cover in the outside of center tube and centrum, the jack catch expansion and the final card of the jack catch that make the slips of centrum and slip in opposite directions block at the sleeve pipe inner wall, the jack catch outside has ceramic column, its characterized in that: the invention also comprises a metal sealing ring, wherein the metal sealing ring is sleeved on the vertebral body, and the upper end of the slip is abutted against the metal sealing ring;
the central pipe below the slips is sequentially sleeved with an orientation ring, a supporting ring, an upper outer pipe and a lower outer pipe, and the four pipes are sequentially in threaded connection;
the clamp spring is arranged on the inner side of the lower part of the orientation ring, the support ring is positioned below the clamp spring and used for supporting the clamp spring, and clamping teeth for limiting the clamp spring to move downwards relative to the central tube are processed on the outer side of the central tube corresponding to the clamp spring section, so that the support ring, the clamp spring and the orientation ring can only move upwards relative to the central tube as a whole;
an annular space is reserved between the upper outer pipe and the central pipe, an upper piston and a lower piston are arranged in the annular space and respectively serve as a piston A and a piston B, wherein the piston A is fixedly and hermetically connected with the central pipe and is in sliding and sealing connection with the upper outer pipe, the inner side of the upper outer pipe of the section of the piston B is provided with an expanding step which limits the piston B, the piston B is in sliding and sealing connection with the upper outer pipe, and the piston B is in sliding and sealing connection with the central pipe, so that a gas chamber is defined by the piston A, the piston B, the central pipe and the upper outer pipe and is called as an upper gas chamber;
an annular space is reserved between the lower outer pipe and the central pipe, two pistons, namely a piston C and a piston D, are arranged in the annular space, wherein the piston C is fixedly and hermetically connected with the central pipe and is in sliding and sealing connection with the lower outer pipe, and the piston D is fixedly and hermetically connected with the lower outer pipe and is in sliding and sealing connection with the central pipe, so that the piston C, the piston D, the central pipe and the lower outer pipe enclose a gas chamber, namely a lower gas chamber;
the inner side of the central tube is divided into an upper expanding section and a lower reducing section, a hydrodynamic rotating paddle is mounted in the expanding section, the hydrodynamic rotating paddle is coaxial with the central tube, a helical gear is connected to a shaft of the hydrodynamic rotating paddle, two coaxial holes are formed in the central tube between the piston B and the piston C, valve cores are mounted in the two holes respectively, a screw meshed with the helical gear is connected between the two valve cores, so that the rotating motion of the helical gear is converted into the axial motion of the screw, one of the valve cores is provided with an axial blind hole and a radial through hole, the axial blind hole is communicated with the radial through hole to form a liquid passing channel communicated with the inner side and the outer side of the central tube, and the axial motion of the valve cores controls the opening and closing;
a soluble rubber soft layer is vulcanized on the valve core;
the outer side of the upper end of the cone body is provided with a reducing section, the outer side of the reducing section is in sliding seal with the continuous oil pipe, and the reducing section and the continuous oil pipe are connected through a releasing shear pin.
Furthermore, two sides of the hydrodynamic rotating paddle are respectively provided with a baffle ring which plays a limiting role.
Furthermore, a sealing spacer ring for limiting the metal sealing ring is sleeved on the vertebral body above the metal sealing ring.
Furthermore, the piston A and the piston C are formed by splicing two semi-rings, an annular groove is processed on the outer side of a central pipe of a section where the piston A and the piston C are located, and the piston A and the piston C are installed in the annular groove.
The invention has the beneficial effects that:
the sealing assembly is a metal sealing ring, and compared with the traditional rubber sealing assembly, the metal sealing ring is thinner, so that the expandability of the drift diameter of the bridge plug is improved.
After the slip reaches a preset position, the hydrodynamic rotating paddle is rotated by pressing the coiled tubing, the rotating motion of the helical gear is converted into the axial motion of the screw, so that the liquid passing channel is opened, the two air cavities are compressed under the action of strong underground hydraulic pressure, and then reverse acting force is formed on the two pistons of each air cavity, and the central tube and the two outer tubes are pulled by the reverse acting force, so that the slips are expanded and anchored on the wall of the casing. Therefore, the self-setting device can realize self-setting after reaching the preset position, and a setting tool is not needed, so that the length of the pipe column is shortened, and the pipe column is prevented from being blocked due to long time when being put into a horizontal well.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view at a-a in fig. 1.
Fig. 3 is a cross-sectional view at B-B in fig. 1.
Fig. 4 is a partially enlarged view at C in fig. 1.
In the figure: 1-coiled tubing, 2-releasing shear pin, 3-cone, 4-sealing spacer ring, 5-metal sealing ring, 6-central tube, 7-slip, 8-orientation ring, 9-support ring, 10-snap spring, 11-upper outer tube, 12-lower outer tube, 13-piston D, 14-lower air cavity, 15-piston C, 16-piston B, 17-upper air cavity, 18-piston A, 19-baffle ring, 20-hydrodynamic rotating paddle, 21-helical gear, 22-screw, 23-valve core and 24-liquid passing channel.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
The clamping jaw type ceramic pipe comprises a central pipe 6, a cone 3 and a slip 7, wherein the central pipe 6 is in threaded connection with the cone 3, the slip 7 is sleeved on the outer sides of the central pipe 6 and the cone 3, the clamping jaws of the slip 7 are expanded and finally clamped on the inner wall of a casing pipe through the opposite movement of the cone 3 and the slip 7, and the outer sides of the clamping jaws are provided with ceramic columns.
The most main innovation points of the invention are as follows:
the invention also comprises a metal sealing ring 5, wherein the metal sealing ring 5 is sleeved on the cone 3, the upper end of the slip 7 is abutted against the metal sealing ring 5, the metal sealing ring 5 replaces the traditional soluble rubber sealing component, and the thickness of the metal sealing ring 5 is smaller than that of the rubber sealing component, so that the expansibility of the drift diameter of the bridge plug is more favorably improved.
The central pipe 6 below the slips 7 is sleeved with an orientation ring 8, a supporting ring 9, an upper outer pipe 11 and a lower outer pipe 12 in sequence, and the four pipes are connected in sequence through threads.
The inner side of the lower portion of the orientation ring 8 is provided with a clamp spring 10, the support ring 9 is located below the clamp spring 10 and used for supporting the clamp spring 10, clamping teeth for limiting the clamp spring 10 to move downwards relative to the central tube 6 are machined on the outer side of the central tube 6 corresponding to the clamp spring 10, and therefore the support ring 9, the clamp spring 10 and the orientation ring 8 can only move upwards relative to the central tube 6 as a whole.
An annular space is reserved between the upper outer tube 11 and the central tube 6, an upper piston and a lower piston are arranged in the annular space, the upper piston and the lower piston are respectively a piston A18 and a piston B16, the piston A18 is fixedly and hermetically connected with the central tube 6 and is in sliding sealing connection with the upper outer tube 11, the inner side of the upper outer tube 11 of the section of the piston B16 is provided with an expanding step, the expanding step plays a limiting role on the piston B16, the piston B16 is in sliding sealing connection with the upper outer tube 11, and the piston B16 is in sliding sealing connection with the central tube 6, so that the piston A18, the piston B16, the central tube 6 and the upper outer tube 11 enclose a gas chamber, namely an upper gas.
When the upper air chamber 17 is subjected to fluid pressure from downhole, the upper air chamber 17 is compressed, the piston a18 and the piston B16 approach each other, the movement of the piston a18 applies a downward pushing force to the central tube 6, and the movement of the piston B16 applies an upward pushing force to the upper outer tube 11, so that two reaction forces finally act between the slips 7 and the cone 3, causing the slips 7 to expand and finally to be stuck on the inner wall of the casing.
An annular space is reserved between the lower outer tube 12 and the central tube 6, two pistons, namely a piston C15 and a piston D13, are arranged in the annular space, wherein the piston C15 is fixedly and hermetically connected with the central tube 6 and is in sliding and sealing connection with the lower outer tube 12, the piston D13 is fixedly and hermetically connected with the lower outer tube 12 and is in sliding and sealing connection with the central tube 6, and therefore a gas chamber, namely a lower gas chamber 14, is defined by the piston C15, the piston D13, the central tube 6 and the lower outer tube 12.
When the lower air cavity 14 is subjected to the pressure of liquid from the underground, the lower air cavity 14 is compressed, the same reverse acting force for setting the bridge plug is generated with the upper air cavity 17, the reaction forces generated by the two air cavities are superposed to enable the setting force to be larger, and the setting effect is better.
The inner side of the central tube 6 is divided into an upper expanding section and a lower reducing section, a hydrodynamic rotating paddle 20 is installed in the expanding section, the hydrodynamic rotating paddle 20 is coaxial with the central tube 6, when the bridge plug is in place, the hydrodynamic rotating paddle 20 is pressed to the continuous oil tube 1, liquid flows through the hydrodynamic rotating paddle 20 to rotate, a helical gear 21 is connected to the shaft of the hydrodynamic rotating paddle 20, and therefore the helical gear 21 and the shaft of the hydrodynamic rotating paddle 20 rotate synchronously. The central tube 6 between the piston B16 and the piston C15 is provided with two coaxial holes, the valve cores 23 are respectively arranged in the two holes, a screw 22 meshed with the helical gear 21 is connected between the two valve cores 23, so that the rotary motion of the helical gear 21 is converted into the axial motion of the screw 22, the length of the thread meshed with the helical gear 21 on the screw 22 is limited, and even if the helical gear 21 always rotates in a single direction, the axial displacement of the screw 22 is fixed, and only the helical gear 21 loses the mesh on the screw 22 and idles. One of the valve cores 23 is provided with an axial blind hole and a radial through hole, the axial blind hole is communicated with the radial through hole to form a liquid passing channel 24, and the axial movement of the valve core 23 controls the opening and closing of the liquid passing channel 24.
In order to ensure the sealing performance of the valve core 23 and the hole, a soluble rubber soft layer is vulcanized on the valve core 23.
The outer side of the upper end of the cone 3 is provided with a reducing section, the outer side of the reducing section is in sliding seal with the coiled tubing 1 and is connected with the coiled tubing 1 through a releasing shear pin 2, the coiled tubing 1 is lifted up after the bridge plug is seated, and the releasing shear pin 2 with low strength is sheared, namely, releasing is realized. According to the invention, a special setting tool is not required to be connected during setting, so that the length of the tubular column is shorter, the occurrence of clamping stagnation accidents is effectively reduced when the tubular column is lowered into a horizontal well, the coiled tubing 1 pushes the bridge plug to descend when the bridge plug is lowered, and the releasing shear pin 2 is not stressed, so that accidental breakage is avoided.
Two sides of the hydrodynamic rotating paddle 20 are respectively provided with a baffle ring 19 which plays a limiting role.
The vertebral body 3 above the metal sealing ring 5 is sleeved with a sealing spacer ring 4 which has a limiting effect on the vertebral body.
The piston A18 and the piston C15 are formed by splicing two half rings, an annular groove is processed on the outer side of a central pipe 6 of a section where the piston A18 and the piston C15 are located, and the piston A18 and the piston C15 are installed in the annular groove.
All parts except the ceramic column are made of soluble materials, and after fracturing, the ceramic column is dissolved by itself to recover the full drift diameter of the sleeve.
The invention is particularly suitable for horizontal well fracturing, the invention is connected to the lower end of a coiled tubing 1 before fracturing and enters a well, in the feeding process, well fluid passes through a hydrodynamic rotating paddle 20 from bottom to top, so that the hydrodynamic rotating paddle 20 rotates anticlockwise, a helical gear 21 rotates anticlockwise along with the hydrodynamic rotating paddle, a screw 22 is driven to move axially, and a fluid passage 24 is blocked; as the bridge plug continues to be lowered, the hydrodynamic rotating paddle 20 continues to rotate counterclockwise, but due to the limited length of the thread on the screw 22, the helical gear 21 loses its engagement with the screw 22 and idles, so that the screw 22 does not continue to displace axially. After the bridge plug is sent to the preset position, the bridge plug is pressed to the continuous oil pipe 1, liquid passes through the hydrodynamic force rotating paddle 20 from top to bottom, the hydrodynamic force rotating paddle 20 rotates clockwise, the helical gear 21 rotates clockwise along with the hydrodynamic force rotating paddle, the screw rod 22 is driven to move axially, the liquid passing channel 24 is opened, the hydrodynamic force rotating paddle 20 continues to rotate clockwise along with continuous pressing, and similarly, the screw rod 22 cannot continue to move axially because the length of the thread on the screw rod 22 is limited, and the opening of the liquid passing channel 24 is kept.
The invention utilizes fluid to drive the hydrodynamic rotary paddle 20, converts the rotary motion into axial movement, thereby opening the liquid passing channel 24, leading the two air cavities to be compressed by strong hydraulic pressure in the well, generating reverse acting force and leading the bridge plug to be set.
Claims (4)
1. The utility model provides an all-metal seal soluble bridge plug, includes center tube (6), centrum (3) and slips (7), center tube (6) and centrum (3) threaded connection, slips (7) cover in the outside of center tube (6) and centrum (3), centrum (3) and the relative motion of slips (7) make the jack catch expansion of slips (7) and finally block at the sleeve pipe inner wall, the jack catch outside has ceramic column, its characterized in that: the invention also comprises a metal sealing ring (5), wherein the metal sealing ring (5) is sleeved on the cone (3), and the upper end of the slip (7) is abutted against the metal sealing ring (5);
a central pipe (6) below the slips (7) is sequentially sleeved with an orientation ring (8), a supporting ring (9), an upper outer pipe (11) and a lower outer pipe (12), and the four are sequentially in threaded connection;
the clamp spring (10) is arranged on the inner side of the lower portion of the orientation ring (8), the support ring (9) is located below the clamp spring (10) and used for supporting the clamp spring (10), clamp teeth for limiting the clamp spring (10) to move downwards relative to the central tube (6) are machined on the outer side of the central tube (6) corresponding to the clamp spring (10), and therefore the support ring (9), the clamp spring (10) and the orientation ring (8) can only move upwards relative to the central tube (6) as a whole;
an annular space is reserved between the upper outer tube (11) and the central tube (6), an upper piston and a lower piston are arranged in the annular space and respectively comprise a piston A (18) and a piston B (16), wherein the piston A (18) is fixedly and hermetically connected with the central tube (6) and is in sliding sealing connection with the upper outer tube (11), the inner side of the upper outer tube (11) of the section of the piston B (16) is provided with an expanding step, the expanding step limits the piston B (16), the piston B (16) is in sliding sealing connection with the upper outer tube (11), and the piston B (16) is in sliding sealing connection with the central tube (6), so that the piston A (18), the piston B (16), the central tube (6) and the upper outer tube (11) enclose a gas chamber which is called as an upper gas chamber (17);
an annular space is reserved between the lower outer pipe (12) and the central pipe (6), two pistons, namely a piston C (15) and a piston D (13), are arranged in the annular space, wherein the piston C (15) is fixedly and hermetically connected with the central pipe (6) and is in sliding and sealing connection with the lower outer pipe (12), and the piston D (13) is fixedly and hermetically connected with the lower outer pipe (12) and is in sliding and sealing connection with the central pipe (6), so that a gas chamber, namely a lower gas chamber (14), is enclosed by the piston C (15), the piston D (13), the central pipe (6) and the lower outer pipe (12);
the inner side of the central tube (6) is divided into an upper expanding section and a lower reducing section, a hydrodynamic rotating paddle (20) is arranged in the expanding section, the hydrodynamic rotating paddle (20) is coaxial with the central tube (6), a helical gear (21) is connected on the shaft of the hydrodynamic rotating paddle (20), a central pipe (6) between the piston B (16) and the piston C (15) is provided with two coaxial holes, two valve cores (23) are respectively arranged in the two holes, a screw rod (22) meshed with the helical gear (21) is connected between the two valve cores (23), thereby converting the rotary motion of the helical gear (21) into the axial motion of the screw (22), one valve core (23) is provided with an axial blind hole and a radial through hole, the axial blind hole is communicated with the radial through hole to form a liquid passing channel (24) communicated with the inside and the outside of the central tube (6), and the axial movement of the valve core (23) controls the opening and the closing of the liquid passing channel (24);
a soluble rubber soft layer is vulcanized on the valve core (23);
the outer side of the upper end of the cone body (3) is provided with a reducing section, the outer side of the reducing section is in sliding seal with the coiled tubing, and the reducing section and the coiled tubing are connected through a releasing shear pin (2).
2. An all-metal sealed soluble bridge plug according to claim 1, wherein: two sides of the hydrodynamic rotating paddle (20) are respectively provided with a baffle ring (19) which has a limiting effect on the hydrodynamic rotating paddle.
3. An all-metal sealed soluble bridge plug according to claim 1, wherein: the vertebral body (3) above the metal sealing ring (5) is sleeved with a sealing spacer ring (4) which can limit the vertebral body.
4. An all-metal sealed soluble bridge plug according to claim 1, wherein: the piston A (18) and the piston C (15) are formed by splicing two semi-rings, an annular groove is processed on the outer side of a central pipe (6) of a section where the piston A (18) and the piston C (15) are located, and the piston A (18) and the piston C (15) are installed in the annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349170.6A CN111502595B (en) | 2020-04-28 | 2020-04-28 | All-metal sealed soluble bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349170.6A CN111502595B (en) | 2020-04-28 | 2020-04-28 | All-metal sealed soluble bridge plug |
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| Publication Number | Publication Date |
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| CN111502595A true CN111502595A (en) | 2020-08-07 |
| CN111502595B CN111502595B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010349170.6A Active CN111502595B (en) | 2020-04-28 | 2020-04-28 | All-metal sealed soluble bridge plug |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228005A (en) * | 2020-09-27 | 2021-01-15 | 齐齐哈尔亚盛机械制造有限公司 | Low setting force bridge plug capable of fishing for well lifting and pressure relief |
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