CN114876407A - Metal sealing dissoluble bridge plug free of ball throwing - Google Patents
Metal sealing dissoluble bridge plug free of ball throwing Download PDFInfo
- Publication number
- CN114876407A CN114876407A CN202210708995.1A CN202210708995A CN114876407A CN 114876407 A CN114876407 A CN 114876407A CN 202210708995 A CN202210708995 A CN 202210708995A CN 114876407 A CN114876407 A CN 114876407A
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- ball
- ball seat
- bridge plug
- hole
- conical
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- 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
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- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions
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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)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
本发明公开一种免投球的金属密封可溶解桥塞，包括推筒，推筒上端与坐封工具螺纹连接，下端装在球座上部的内孔里；还包括拉杆和转换接头，拉杆和转换接头位于轴心，转换接头、球座、卡瓦依次套装在拉杆上；转换接头设在推筒内，转换接头上端连接坐封工具，下端位于球座内并通过螺纹连接拉杆；球座下端与卡瓦套接；底座套装在拉杆尾部并通过螺纹连接；可溶解球位于转换接头下端内。本发明节省了在井口投入可溶解球的环节，提高了施工效率，并且桥塞坐封后，立即对桥塞的坐封情况进行验证，提高了桥塞施工的可靠性。金属密封环温度适应范围宽，密封效果好；整体卡瓦和锁紧结构，减少工具的部件，缩短了工具的尺寸，有利于工具的下入。
The invention discloses a ball-free metal-sealed dissolvable bridge plug, comprising a push cylinder, the upper end of the push cylinder is threadedly connected with a setting tool, and the lower end is installed in the inner hole of the upper part of the ball seat; it also includes a pull rod and a conversion joint, the pull rod and the conversion joint. The joint is located at the center of the shaft, and the conversion joint, the ball seat and the slip are successively sleeved on the tie rod; the conversion joint is arranged in the push cylinder, the upper end of the conversion joint is connected with the setting tool, and the lower end is located in the ball seat and is connected with the tie rod through threads; Slip socket; the base is set at the end of the tie rod and connected by thread; the dissolvable ball is located in the lower end of the adapter. The invention saves the link of putting dissolvable balls at the wellhead, improves the construction efficiency, and immediately after the bridge plug is set, the setting condition of the bridge plug is verified, thereby improving the reliability of the bridge plug construction. The metal sealing ring has a wide temperature adaptation range and good sealing effect; the overall slip and locking structure reduce the number of tool parts, shorten the size of the tool, and facilitate the running of the tool.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a pitching-free metal sealing dissolvable bridge plug.
Background
At present, soluble rubber is mostly adopted to be processed into sealing materials for the soluble bridge plugs used in the market. The dissoluble rubber material is characterized in that when the temperature of an oil well is high, the rubber strength is quickly lost, the sealing capability is reduced, and meanwhile, the dissoluble capability is reduced, the dissolution time is long or the dissolution is not carried out in a low-temperature state. In addition, the rubber-sealed bridge plug has a complex structure, more parts and long size, increases the cost of the tool and is not beneficial to running the tool.
At present, the bridge plug staged fracturing adopts perforation and bridge plug setting combined technology, namely after the bridge plug is set, the cable is lifted and put in to carry out perforation, then a perforation tool and a setting tool are taken out of an oil well, a sealing ball is put in during fracturing to plug a central channel of the bridge plug, and two problems mainly exist: firstly, the ball throwing reduces the operation efficiency and wastes liquid for pumping the ball; the setting condition of the bridge plug cannot be verified.
In addition, the soluble bridge plug sealing parts in the prior art are all made of rubber materials, the application range is limited, the number of structural parts is large, the design has defects, the length is long, the inner diameter is small, and the soluble bridge plug sealing parts are not required to be inserted. Need drop into the central channel of a ball shutoff bridge plug from the well head after the bridge plug sets up to seal, can not verify the setting condition of bridge plug simultaneously, influenced work efficiency and fracturing effect.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a metal sealing dissolvable bridge plug free of ball injection, which has the advantages of simple structure, few parts, short length and reliable sealing, so as to solve the problems of defects and shortcomings in use of the dissolvable bridge plug in the prior art.
A metal sealing dissoluble bridge plug without ball throwing comprises a push cylinder, wherein the upper end of the push cylinder is in threaded connection with a setting tool, and the lower end of the push cylinder is arranged in an inner hole in the upper part of a ball seat;
the pull rod and the adapter are positioned on the axis, and the adapter, the ball seat and the slips are sequentially sleeved on the pull rod;
the conversion joint is arranged in the push cylinder, the upper end of the conversion joint is connected with a setting tool, and the lower end of the conversion joint is positioned in the ball seat and is connected with the pull rod through threads;
the lower end of the ball seat is sleeved with the slips; the base is sleeved at the tail part of the pull rod and is connected with the pull rod through threads; the dissolvable ball is located within the lower end of the crossover joint.
The push cylinder is of a cylindrical structure and sequentially comprises a large-diameter cylindrical surface at the upper end and a small-diameter cylindrical surface at the lower end, the inner wall of the upper end is provided with a thread connected with a setting tool, the lower end is provided with a notch, and the notch extends from the small-diameter cylindrical surface to the large-diameter cylindrical surface; and two symmetrical counter bores are arranged on the side surface in the direction vertical to the notch, and are provided with threads and are in threaded connection with the guide screws.
The adapter is of a cylindrical structure, the outer cylindrical surface comprises a small cylindrical surface at the lower end and a large cylindrical surface at the upper end, the joint of the small cylindrical surface and the large cylindrical surface is a transition conical surface, two symmetrical planes are cut out from the small cylindrical surface, and a spherical hole is formed in the planes; the soluble ball is arranged in the ball hole of the adapter; two symmetrical guide grooves are arranged on the outer cylindrical surface, the axes of the guide grooves are perpendicular to the axis of the ball hole, and the tail ends of the guide screws are positioned in the guide grooves. The inner wall of the upper end is provided with a thread connected with a setting tool, and the inner wall of the lower end is provided with a thread connected with a pull rod;
the locking device comprises a ball seat and a cylindrical structure, wherein the lower end of the outer surface of the ball seat is a conical surface, and the lower end of the conical surface is provided with a locking conical thread; from the upper end to the lower extreme, the inner chamber of ball seat includes three diameter first hole, second hole, the third hole that diminishes in proper order, is equipped with step and an interior conical surface between first hole and the second hole, is equipped with sealed conical surface between second hole, the third hole. The step is attached to the lower end face of the push cylinder; the inner conical surface is attached to the transition conical surface of the adapter.
The slips are of a cylindrical structure, the inner wall of the upper end of the slips is a conical hole, the lower end of the conical hole is a conical thread, the slips are sleeved on the ball seat, and the conical hole is meshed with the conical surface of the ball seat. A plurality of notches are uniformly and mutually intersected and cut along the axial direction from the upper end surface and the lower end surface of the slip, and a round hole is radially arranged at the tail end of each notch from the outer cylindrical surface.
The metal sealing element is of a cylindrical structure, the inner surface of the metal sealing element is a sealing conical surface, and the metal sealing element is sleeved on the conical surface of the ball seat and is positioned on the end face of the upper end of the slip.
When the bridge plug is set, the push cylinder and the ball seat move forwards along the axial direction, and the adapter, the soluble ball, the metal sealing ring, the slip, the base and the pull rod are relatively static along the axial direction. Under the push of the push cylinder and the ball seat, the metal sealing ring and the slips expand along the radial direction.
After the metal sealing ring and the slips expand in the radial direction to a certain size, the metal sealing ring and the slips are tightly attached to the inner wall of the sleeve, and the metal sealing ring vertically seals and separates the sleeve. The slips are anchored to the casing and bear the pressure after the upper packing.
When the push cylinder, the conversion joint, the soluble ball and the pull rod are pulled out outwards along the axial direction, the soluble ball slides out of the ball hole.
When fracturing a zone of interest, the dissolvable ball sits on a sealing cone within the ball seat.
The pull rod, the conversion joint, the outer pushing cylinder and the guide screw are made of metal materials, after the bridge plug is seated and sealed, the pull rod, the conversion joint, the outer pushing cylinder and the guide screw are lifted out of an oil well, other parts are thrown in the well, the dissolvable ball is pushed by fracturing fluid and is seated on the conical surface of the ball seat, the central passage of the bridge plug is sealed, and the fracturing interval is sealed. The components lost in the well are all made of magnesium-based soluble metal materials, and automatically dissolve after fracturing is completed.
The novel bridge plug central channel structure is adopted, the link of throwing the dissoluble ball into a wellhead after the traditional bridge plug is seated is saved, the construction efficiency is improved, the seat sealing condition of the bridge plug is immediately verified after the bridge plug is seated, and the construction reliability of the bridge plug is improved. Meanwhile, the metal sealing ring has wide temperature adaptation range and good sealing effect; the whole slip and the novel locking structure reduce the components of the tool, shorten the size of the tool and are beneficial to the running of the tool.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a three-dimensional view of the pusher of the present invention;
FIG. 4 is a three-dimensional view of a crossover joint of the present invention;
FIG. 5 is a structural view of a tee of the present invention
FIG. 6 is a three-dimensional view of the slip bowl of the present invention
FIG. 7 is one of the principle views of the bridge plug setting of the present invention
FIG. 8 is a second schematic view of the bridge plug setting of the present invention
Fig. 9 is a schematic view of the ball seat of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in figures 1 and 2, the metal sealing dissoluble bridge plug without throwing the ball comprises a push cylinder 1, wherein the upper end of the push cylinder 1 is in threaded connection with a setting tool, and the lower end of the push cylinder 1 is arranged in an inner hole at the upper part of a ball seat 4;
the pull rod 7 and the adapter 2 are positioned on the axis, and the adapter 2, the ball seat 4 and the slip 6 are sequentially sleeved on the pull rod 7;
the conversion joint 2 is arranged in the push cylinder 1, the upper end of the conversion joint 2 is connected with a setting tool, and the lower end of the conversion joint is positioned in the ball seat 4 and is connected with the pull rod 7 through threads;
the lower end of the ball seat 4 is sleeved with a slip 6; the base 8 is sleeved on the tail part of the pull rod 7 and is connected with the pull rod through threads; the soluble ball 3 is positioned in the lower end of the adapter 2;
as shown in fig. 3, the push tube 1 is a cylindrical structure, and sequentially comprises a large-diameter cylindrical surface 14 at the upper end and a small-diameter cylindrical surface 15 at the lower end, the inner wall of the upper end is provided with a thread connected with a setting tool, the lower end is provided with a notch 11, the width of the notch 11 is 30-50mm, and the length of the notch is 50-160 mm; the notch 11 extends from the small diameter cylindrical surface 15 to the large diameter cylindrical surface 14; two symmetrical counter bores 12 are formed in the side face perpendicular to the notch 11, and the counter bores 12 are provided with threads and are in threaded connection with a guide screw 19.
As shown in fig. 4, the adapter 2 is a cylindrical structure, the outer cylindrical surface includes a lower small cylindrical surface 21 and an upper large cylindrical surface 22, the joint between the small cylindrical surface 21 and the large cylindrical surface 22 is a transition conical surface 23, two symmetrical planes 24 are cut from the small cylindrical surface 21, and a spherical hole 25 is formed in the plane 24; the soluble ball 3 is arranged in the ball hole 25 of the adapter 2; two symmetrical guide grooves 26 are arranged on the outer cylindrical surface, the axes of the guide grooves 26 are perpendicular to the axis of the ball hole 25, and the tail end of the guide screw 19 is positioned in the guide grooves 26. The inner wall of the upper end is provided with a thread connected with a setting tool, and the inner wall of the lower end is provided with a thread connected with a pull rod 7;
as shown in fig. 5, the ball seat 4 is of a cylindrical structure, the lower end of the outer surface of the ball seat 4 is a conical surface 41, and the lower end of the conical surface 41 is provided with a locking conical thread 42 with the length of 10-40 mm; from the upper end to the lower end, the inner cavity of the ball seat 4 comprises a first inner hole 43, a second inner hole 44 and a third inner hole 45 with gradually reduced diameters, a step 46 and an inner conical surface 47 are arranged between the first inner hole 43 and the second inner hole 44, and a sealing conical surface 48 is arranged between the second inner hole 44 and the third inner hole 45. The step 46 is attached to the lower end face of the push cylinder 1; the inner tapered surface 47 abuts the transition tapered surface 23 of the adapter 2.
As shown in FIG. 6, the slip 6 has a cylindrical structure, the inner wall of the upper end is a conical hole 61, the lower end of the conical hole 61 is a conical thread 62, the slip 6 is sleeved on the ball seat 4, and the conical hole 61 is engaged with the conical surface 41 of the ball seat 4. A plurality of cuts 63 are evenly and mutually intersected and cut along the axial direction from the upper end face and the lower end face of the slip 6, each cut 63 is 5-10mm away from the end face, and a round hole 64 is radially arranged at the tail end of each cut 63 from the outer cylindrical surface.
The metal sealing element 5 is a cylindrical structure, the inner surface of which is a sealing conical surface 51, is sleeved on the conical surface 41 of the ball seat 4 and is positioned at the upper end surface of the slip 6.
As shown in fig. 7, in one of the bridge plug setting schematics according to the present invention, the metal seal ring 5 is expanded outward to the inner wall of the casing 50, the slips 6 are expanded outward to the inner wall of the casing 50,
as shown in fig. 8, according to the second principle diagram of bridge plug setting of the present invention, after the bridge plug is set, when the push cylinder 1, the adapter 2, the dissolvable ball 3 and the pull rod 7 are pulled out axially and outwardly, the dissolvable ball 3 slides out of the ball hole 25.
As shown in fig. 9, according to the soluble ball seating principle diagram of the invention, the setting tool is lifted up to pump liquid into the wellbore, the soluble ball 3 enters the central hole of the bridge plug along with the liquid, and the soluble ball 3 falls on the sealing conical surface 48 of the ball seat 4 to block the central passage of the bridge plug.
Claims (6)
1. The metal sealing dissoluble bridge plug free of ball throwing is characterized by comprising a push cylinder (1), wherein the upper end of the push cylinder (1) is in threaded connection with a setting tool, and the lower end of the push cylinder is arranged in an inner hole in the upper part of a ball seat (4);
the ball seat is characterized by further comprising a pull rod (7) and an adapter (2), wherein the pull rod (7) and the adapter (2) are located at the axis, and the adapter (2), the ball seat (4) and the slips (6) are sequentially sleeved on the pull rod (7);
the conversion joint (2) is arranged in the push cylinder (1), the upper end of the conversion joint (2) is connected with a setting tool, and the lower end of the conversion joint is positioned in the ball seat (4) and is connected with the pull rod (7) through threads;
the lower end of the ball seat (4) is sleeved with the slips (6); the base (8) is sleeved at the tail part of the pull rod (7) and is connected with the pull rod through threads; the soluble ball (3) is positioned in the lower end of the adapter (2).
2. The pitching-free metal-sealed dissolvable bridge plug according to claim 1, wherein the push sleeve (1) is of a cylindrical structure and sequentially comprises a large-diameter cylindrical surface (14) at an upper end and a small-diameter cylindrical surface (15) at a lower end, the inner wall of the upper end is provided with threads connected with a setting tool, the lower end is provided with a notch (11), and the notch (11) extends from the small-diameter cylindrical surface (15) to the large-diameter cylindrical surface (14); two symmetrical counter bores (12) are formed in the side face in the direction perpendicular to the notch (11), and threads are arranged on the counter bores (12) and are in threaded connection with the guide screws (19).
3. The pitching-free metal-sealed soluble bridge plug as claimed in claim 2, wherein the adapter (2) is of a cylindrical structure, the outer cylindrical surface comprises a small cylindrical surface (21) at the lower end and a large cylindrical surface (22) at the upper end, the joint of the small cylindrical surface (21) and the large cylindrical surface (22) is a transition conical surface (23), two symmetrical planes (24) are cut on the small cylindrical surface (21), and a spherical hole (25) is formed in the plane (24); the soluble ball (3) is arranged in the ball hole (25) of the adapter (2); two symmetrical guide grooves (26) are arranged on the outer cylindrical surface, the axes of the guide grooves (26) are vertical to the axis of the ball hole (25), and the tail end of the guide screw (19) is positioned in the guide grooves (26); the inner wall of the upper end is provided with a thread connected with a setting tool, and the inner wall of the lower end is provided with a thread connected with a pull rod (7).
4. The pitching-free metal-sealed soluble bridge plug as claimed in claim 3, wherein the ball seat (4) is of a cylindrical structure, the lower end of the outer surface of the ball seat (4) is a conical surface (41), and the lower end of the conical surface (41) is provided with a locking conical thread (42); from the upper end to the lower end, the inner cavity of the ball seat (4) sequentially comprises a first inner hole (43), a second inner hole (44) and a third inner hole (45), the diameters of the first inner hole (43), the second inner hole (44) and the third inner hole (45) are gradually reduced, a step (46) and an inner conical surface (47) are arranged between the first inner hole (43) and the second inner hole (44), and a sealing conical surface (48) is arranged between the second inner hole (44) and the third inner hole (45); the step (46) is attached to the lower end face of the push cylinder (1); the inner conical surface (47) is attached to the transition conical surface (23) of the adapter (2).
5. The pitching-free metal-sealed soluble bridge plug as claimed in claim 4, wherein the slips (6) are of a cylindrical structure, the inner wall of the upper end of the slip is a conical hole (61), the lower end of the conical hole (61) is a conical thread (62), the slips (6) are sleeved on the ball seat (4), and the conical hole (61) is meshed with the conical surface (41) of the ball seat (4); a plurality of cuts (63) are evenly and mutually intersected and cut along the axial direction from the upper end surface and the lower end surface of the slip (6), and a round hole (64) is radially arranged at the tail end of each cut (63) from the outer cylindrical surface.
6. The pitching-free metal-sealed dissolvable bridge plug according to claim 5, further comprising a metal seal (5), a cylindrical structure, the inner surface of which is a sealing conical surface (51), which fits over the conical surface (41) of the ball seat (4) and is located at the upper end face of the slip (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210708995.1A CN114876407B (en) | 2022-06-21 | 2022-06-21 | A ball-free metal-sealed dissolvable bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210708995.1A CN114876407B (en) | 2022-06-21 | 2022-06-21 | A ball-free metal-sealed dissolvable bridge plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114876407A true CN114876407A (en) | 2022-08-09 |
| CN114876407B CN114876407B (en) | 2025-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210708995.1A Active CN114876407B (en) | 2022-06-21 | 2022-06-21 | A ball-free metal-sealed dissolvable bridge plug |
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| CN (1) | CN114876407B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116575884A (en) * | 2023-05-25 | 2023-08-11 | 重庆昱华新材料科技有限公司 | Expansion sealing metal sealing soluble bridge plug |
| CN117703304A (en) * | 2023-12-27 | 2024-03-15 | 重庆昱华新材料科技有限公司 | An all-metal soluble ball seat for self-compensating fracturing |
| US20250163772A1 (en) * | 2023-11-17 | 2025-05-22 | Parker-Hannifin Corporation | Fracking Plug with a Telescopic Cone Configuration |
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| CN215949429U (en) * | 2021-09-16 | 2022-03-04 | 重庆贝斯特石油科技有限公司 | Metal sealing dissoluble bridge plug |
| CN217538649U (en) * | 2022-06-21 | 2022-10-04 | 重庆昱华新材料科技有限公司 | Metal sealing dissoluble bridge plug free of ball throwing |
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|---|---|---|---|---|
| CN116575884A (en) * | 2023-05-25 | 2023-08-11 | 重庆昱华新材料科技有限公司 | Expansion sealing metal sealing soluble bridge plug |
| US20250163772A1 (en) * | 2023-11-17 | 2025-05-22 | Parker-Hannifin Corporation | Fracking Plug with a Telescopic Cone Configuration |
| US12320229B1 (en) * | 2023-11-17 | 2025-06-03 | Parker-Hannifin Corporation | Fracking plug with a telescopic cone configuration |
| CN117703304A (en) * | 2023-12-27 | 2024-03-15 | 重庆昱华新材料科技有限公司 | An all-metal soluble ball seat for self-compensating fracturing |
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| Publication number | Publication date |
|---|---|
| CN114876407B (en) | 2025-11-14 |
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