CN216553870U

CN216553870U - Slips integrated soluble bridge plug

Info

Publication number: CN216553870U
Application number: CN202123044864.8U
Authority: CN
Inventors: 李雪松; 魏春秉; 关峰; 陈浩; 赵强; 丁旭东; 李永革; 周祺东; 段正佳; 王�琦; 张凯; 朋礼军
Original assignee: Beijing Tianqing Lidu Technology Co ltd
Current assignee: Beijing Tianqing Lidu Technology Co ltd
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2022-05-17
Anticipated expiration: 2031-12-07

Abstract

A slip integrated soluble bridge plug comprises a seat ball seat, a seat core shaft and a packing ball, wherein the seat ball seat comprises slips, a guide cone, a weak point stop block, an expansion sealing ring and a rubber sealing ring, the slip and the guide cone are sleeved in a matching way, the expansion sealing ring and the expansion stop ring are sleeved on the guide cone, the rubber sealing ring is sleeved on the expansion sealing ring in an embedding way, the weak point stop block is connected to the lower end of the slips, the seat core shaft comprises a core shaft rod, a core shaft baffle plate and a shearing nut, the slips, the guide cone, the weak point stop block, the expansion sealing ring, the packing ball, the rubber sealing ring and a ceramic insert block are all soluble materials, a radial guide groove is arranged on the weak point stop block through alternately arranging separation openings with upper and lower end openings on a slip cylinder body, the ceramic insert block is embedded on the outer circumferential surface of the slips, the stability of the seat seal is improved, and the reliability of the seal is improved through forming multi-grade stepped seal, the method is applied to production, and can simplify the operation process, reduce the labor intensity and improve the construction efficiency.

Description

Slips integrated soluble bridge plug

Technical Field

The utility model relates to a soluble bridge plug, in particular to a slip integrated soluble bridge plug.

Background

In oil field production, due to the fact that geological conditions such as pressure, temperature, lithology and the like in different stratums are different, sometimes tool production process requirements need to be separated from different oil and gas stratums, high-pressure fracturing construction operations are conducted respectively, in production, bridge plugs are often needed to be used for separating different stratums in a casing, manual drilling and grinding must be conducted to remove the bridge plugs by adopting conventional metal materials in construction completion, and in order to simplify construction procedures, improve efficiency and reduce cost, in recent years, the bridge plugs are made of metal materials. The soluble bridge plug is more and more widely used, the utility model patent with the patent number of 2021109739593 discloses a soluble bridge plug which adopts a sheet-shaped combined slip structure and is combined and connected by a backing ring sleeve, and during the opening process of the slip assembly, because the combined slip does not have the integral self-adaptability of deformation and is influenced by multiple factors such as self-gravity action, the structural condition of a sleeve and the like, partial tiles often deviate from the original circumferential array, so that the combined slip is difficult to present a uniform deformation state, the ring gasket for hooping the slip is always acted by the unbalanced force of the slip tile, the self presenting part is regularly deformed, the self layout has the function of sealing, but also can generate very adverse effect on the sealing effect of the sealing ring which is connected and matched with the combined slip structure and the sealing ring which is embedded on the sealing ring, and further the sealing performance of the soluble bridge plug of the combined slip structure. Therefore, the structure of the soluble bridge plug in the prior art needs to be further optimized and perfected, the setting performance is improved, and the stability of the casing packing and the reliability of sealing are improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a soluble bridge plug, which is characterized in that a main body component is prepared from a soluble material, and a slip integrated design structure is adopted, so that the performance characteristics of a soluble metal material are exerted, the structural design is optimized, and the stability of bridge plug setting and the reliability of sealing are improved.

A slip integrated soluble bridge plug comprises a seat sealing ball seat, a seat sealing mandrel and a packing ball; the seating ball seat comprises: the slip and the guide cone are integrally in the shape of a circular cylinder, the inner circumferential surface of the slip and the outer circumferential surface of the guide cone are conical surfaces which correspond to each other and are sleeved in a matched mode, an annular plane used for being in butt joint with an outer barrel of a seat sealing tool is arranged on the upper end surface of the slip, a sealing cavity is formed in the upper end surface of the guide cone, the aperture of the sealing cavity is larger than that of an inner hole of the guide cone, an expansion sealing ring is arranged at the upper end of the slip in a matched mode and sleeved on the guide cone, the outer diameter of the expansion sealing ring is larger than that of the slip, the rubber sealing ring is embedded in an annular groove formed in the outer ring surface of the expansion sealing ring and protrudes out of the outer ring surface of the expansion sealing ring, and the stop block is a circular ring-shaped block, the slip is provided with an inward convex annular weak point and is connected to the lower end of the slip in a matching way; the seat dabber includes: the upper end of the core shaft rod is provided with an external thread for connecting a piston rod of the seat sealing tool, the core shaft baffle and the shearing nut are respectively in threaded connection fit with the upper end and the lower end of the core shaft rod, and the diameter of the shearing nut is respectively smaller than the inner hole apertures of the weak point stop block and the guide cone; the sphere diameter of the packing ball is smaller than the aperture of the packing cavity and larger than the aperture of the inner hole of the guide cone, and the packing ball is accommodated in the packing cavity and can be matched with and seal the circular inner hole of the guide cone; wherein: the slips, the guide cone, the weak point stop block, the expansion sealing ring and the packing ball are all made of soluble metal materials, and the rubber sealing ring is made of soluble rubber materials.

The soluble bridge plug of a slip-in-one type, preferably the setting ball seat, further comprises: the expansion check ring is arranged between the slips and the expansion sealing ring in a matched mode and sleeved on the guide cone to buffer the impact strength of the expansion check ring under the working condition, the influence caused by non-uniform deformation of the expansion check ring is avoided, the expansion check ring and the sealing effect between the rubber sealing ring and the oil well casing are influenced, meanwhile, the sealing gradient between the seat sealing ball seat and the oil well casing is increased, the sealing reliability is improved, the expansion check ring is made of soluble metal materials, and the outer diameter of the expansion check ring is smaller than that of the expansion sealing ring and larger than that of the slips.

Furthermore, preferably, the outer circumferential surface of the expansion retainer ring is provided with a water line groove, so that the surface is easier to generate adaptive deformation, and the sealing effect is further improved.

Preferably, the slip cylinder is provided with separating ports with one opened upper end or one opened lower end along the axis direction, the separating ports are uniformly distributed on the circumference of the slip cylinder, and the separating ports with the opened upper end or the opened lower end are alternately arranged, so that the slips can keep the coordination and adaptation between the upper part and the lower part when being stressed and deformed, the deformation uniformity is improved, and the setting stability of the setting ball seat is further improved.

Preferably, ceramic embedded blocks are distributed and embedded on the outer circumferential surface of the slip, the combination capacity of the slip and the surface of the sleeve is enhanced by utilizing the performance characteristic of high hardness of ceramic materials, the stability of the setting ball seat is further improved, the ceramic embedded blocks are soluble ceramic materials, every 2 adjacent separating ports are distributed along the axial direction of the slip, and the protruding outer diameter of each ceramic embedded block is kept smaller than the outer diameter of the expansion check ring.

Furthermore, a certain inclination angle is preferably formed between the ceramic insert block and the outer circumferential surface of the slip, so that the bonding capability of the slip and the surface of the casing is further enhanced.

Preferably, radial guide grooves which are uniformly distributed along the circumference are formed in the connection surface of the weak point stop block and the slip, meanwhile, a corresponding matching structure with the radial guide grooves is arranged on the lower end surface of the slip, the radial guide grooves can guide the radial deformation of the slip, the twisting deformation of the slip in the circumferential direction is limited, and the deformation uniformity of the slip is further improved.

The utility model has the beneficial effects that: provides a soluble bridge plug adopting an integrated slip structure, which is characterized in that separating ports with openings at the upper end or the lower end are alternately arranged on a slip cylinder body, the weak point stop block is provided with a radial guide groove to improve the uniformity of the stressed deformation of the slip, the outer circumferential surface of the slip is embedded with a ceramic insert block to enhance the combination capability of the slip and the surface of the sleeve, thereby improving the stability of the setting ball seat, and simultaneously, by optimizing the structure of the expansion retaining ring, on the basis that the rubber sealing ring and the sleeve form primary soft sealing and the expansion sealing ring and the sleeve form primary hard sealing, the expansion check ring and the sleeve can further form secondary hard sealing to form multi-level step sealing, the reliability of bridge plug sealing is improved, and the method is applied to production, the assembling operation process of the split slips is omitted, the operation process can be simplified, the labor intensity is reduced, and the construction efficiency is improved.

Drawings

FIG. 1 is a front view of a soluble casing packer in a downhole condition.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a sectional view taken along line B-B of fig. 2.

FIG. 4 is a block diagram of a soluble casing packer set state.

Detailed Description

The claimed technical solution is further described with reference to the specific embodiments and the accompanying drawings.

A slip integrated soluble bridge plug adopts an integrated slip structure, as shown in figures 1 to 4, and is composed of a setting ball seat, a setting mandrel and a packing ball 11; the seat seal ball seat is composed of a slip 1, a guide cone 2, a weak point stop 3, an expansion seal ring 4, a rubber seal ring 5 and an expansion check ring 6, wherein the slip 1 and the guide cone 2 are integrally in the shape of a circular cylinder, the inner circumferential surface of the slip 1 and the outer circumferential surface of the guide cone 2 are conical surfaces corresponding to each other and are sleeved with each other in a matching manner, 12 separating ports 12 with one ends opened are formed in the cylinder of the slip 1 along the axial direction, the separating ports 12 are uniformly distributed on the circumference of the cylinder of the slip 1, the separating ports 12 with the upper ends or the lower ends opened are arranged at intervals, a sealing and separating cavity is formed in the upper end surface of the guide cone 2, the expansion seal ring 4 and the expansion check ring 6 are sequentially arranged at the upper end of the slip 1 in a matching manner from top to bottom and are sleeved on the guide cone 2, the rubber seal ring 5 is embedded in an annular groove formed in the outer circumferential surface of the expansion seal ring 4, the outer circumferential surface of the expansion sealing ring 4 is protruded, an annular water line groove is formed in the outer circumferential surface of the expansion retaining ring 6, ceramic embedded blocks 7 are regularly distributed and embedded in the outer circumferential surface of the slip 1, the ceramic embedded blocks 7 are protruded out of the outer circumferential surface of the slip 1 and form an inclination angle of 5 degrees with the outer circumferential surface of the slip 1, the protruded outer diameter of the ceramic embedded blocks 7 is smaller than the outer diameter of the expansion retaining ring 6, the outer diameter of the expansion retaining ring 6 is smaller than the outer diameter of the expansion sealing ring 4, the weak point stop block 3 is an annular block body and is provided with an inner annular weak point, the inner annular weak point is connected to the lower end of the slip 1 in a matching mode, a radial guide groove is formed in a connecting surface, and a corresponding matching structure with the radial guide groove is arranged on the lower end surface of the slip 1; the seat seal mandrel consists of a mandrel rod 10, a mandrel baffle plate 9 and a shearing nut 8, wherein the mandrel baffle plate 9 and the shearing nut 8 are respectively in threaded connection and fit with the upper end and the lower end of the mandrel rod 10; the packing ball 11 is a compact ball, the diameter of the ball is smaller than the aperture of the packing cavity and larger than the aperture of the inner hole of the guide cone 2; wherein: the tile 1, the guide cone 2, the weak point stop 3, the expansion sealing ring 4, the expansion retainer ring 6 and the packing ball 11 are all made of soluble metal materials, the rubber sealing ring 5 is made of soluble rubber materials, and the ceramic insert 7 is made of soluble ceramic materials.

When the slip integrated soluble bridge plug is used, a setting ball seat and a setting mandrel are firstly connected into a whole at a wellhead, as shown in figures 1 to 3, a connecting body of the setting ball seat and the setting mandrel is connected to a setting tool before the bridge plug is driven into a well, wherein a mandrel rod 1 is in threaded connection with a piston rod of the setting tool, and the upper end surface of a guide cone 2 is tightly connected with an outer cylinder of the setting tool; after firm connection, the setting tool is sent into a well, after the setting tool reaches a designated position, an outer cylinder of the setting tool is fixed, a piston rod of the setting tool is lifted by a pulling force smaller than the limit value of the weak point of a weak point stop 3, a core shaft rod 10 is pulled by the piston rod, the pulling force is transmitted to the weak point stop 3 through a shearing nut 8 by the core shaft rod 10, the weak point baffle 3 continuously transmits the pulling force to a slip 1 and a guide cone 1, and the slip 1 and the guide cone 1 are extruded to generate interaction due to the fact that the guide cone 1 is limited by the outer cylinder of the setting tool, so that the slip 1, an expansion sealing ring 4, a rubber sealing ring 5 and an expansion check ring 6 generate radial expansion deformation; because the outer diameter of the expansion sealing ring 4 is larger than that of the expansion retaining ring 6, the outer diameter of the expansion retaining ring 6 is larger than that of the ceramic insert 7 embedded on the slip 1, and the rubber sealing ring 5 protrudes out of the outer circumferential surface of the expansion retaining ring 6, when the three are expanded radially, the rubber sealing ring 5 is firstly contacted and expanded with the sleeve to form primary soft sealing with the shaft, then, under the continuous action of the mandrel rod 10, the expansion sealing ring 4 is also subjected to plastic deformation, the expansion pressing is carried out on the sleeve to form primary hard sealing with the shaft, and then, the expansion retaining ring 6 is further subjected to plastic deformation, the expansion pressing is carried out on the sleeve to form secondary hard sealing with the shaft, the shaft wall is pressed to form secondary hard sealing, and secondary hard sealing is formed, thus the multistage secondary sealing with 1-stage soft sealing and 2-stage hard sealing is realized, the sealing effect of the bridge plug can be obviously improved, further, under the continuous action of the core shaft rod 10, the slips 1 are finally expanded and extruded on the sleeve to finish the fixed setting of the bridge plug, and as the ceramic embedding blocks 7 are high in hardness and have inclination angles relative to the outer circumferential surface and are embedded on the surface of the sleeve, the binding force between the slips 1 and the shaft can be enhanced, and the setting force of the bridge plug is obviously enhanced. And under the fixed setting state of the setting ball seat, increasing lifting force, lifting a piston rod of the setting tool by adopting the pulling force larger than the limit value of the weak point stop block 3, shearing the inward annular weak point of the weak point stop block 3 by the shearing nut 8, and lifting the setting mandrel out of a well mouth along with the setting tool, wherein the weak point stop block 3 is separated from the slip 1 as shown in fig. 4, at the moment, a packing ball 11 is thrown into the well, falls and is contained in a packing cavity of the guide cone 2, the circular inner hole of the guide cone is sealed, the separation of the stratum is completed in the sleeve, and then the bottom layer high-pressure fracturing construction can be carried out.

All the components of the setting ball seat and the packing ball 11 which are retained underground are prepared by soluble materials, so that the construction operation is completed without subsequent drilling and grinding operation, all the components can be completely dissolved in a certain period, the construction procedures are reduced, the production cost is reduced, and the construction efficiency is improved.

Claims

1. A slip integrated soluble bridge plug comprises a seat sealing ball seat, a seat sealing mandrel and a packing ball (11);

the seating ball seat comprises: the sealing device comprises a slip (1), a guide cone (2), a weak point stop block (3), an expansion sealing ring (4) and a rubber sealing ring (5), wherein the slip (1) and the guide cone (2) are integrally in the shape of a circular cylinder, the inner circumferential surface of the slip (1) and the outer circumferential surface of the guide cone (2) are respectively conical surfaces which correspond to each other and are matched with each other in a sleeved mode, an annular plane is arranged on the upper end surface of the slip (1), a sealing cavity is formed in the upper end surface of the guide cone (2), the aperture of the sealing cavity is larger than that of an inner hole of the guide cone (2), the expansion sealing ring (4) is arranged at the upper end of the slip (1) in a matched mode and sleeved on the guide cone (2), the outer diameter of the expansion sealing ring (4) is larger than that of the slip (1), and the rubber sealing ring (5) is embedded and sleeved in an annular groove formed in the outer circumferential surface of the expansion sealing ring (4), the weak point stop block (3) is a circular block body, has an inward convex circular weak point and is connected to the lower end of the slip (1) in a matching way;

the seat dabber includes: the core shaft rod comprises a core shaft rod (10), a core shaft baffle plate (9) and a shearing nut (8), wherein an external thread is arranged at the upper end of the core shaft rod (10), the core shaft baffle plate (9) and the shearing nut (8) are respectively in threaded connection fit with the upper end and the lower end of the core shaft rod (10), and the diameter of the shearing nut (8) is respectively smaller than the inner hole apertures of the weak point stop block (3) and the guide cone (2);

the sphere diameter of the packing ball (11) is smaller than the aperture of the packing cavity and larger than the aperture of the inner hole of the guide cone (2);

wherein: the slip (1), the guide cone (2), the weak point stop block (3), the expansion sealing ring (4) and the packing ball (11) are all made of soluble metal materials, and the rubber sealing ring (5) is made of soluble rubber materials;

the method is characterized in that: the seating ball seat further comprises: the expansion retaining ring (6) is arranged between the slip (1) and the expansion sealing ring (4) in a matched mode and sleeved on the guide cone (2), the expansion retaining ring (6) is made of a soluble metal material, and the outer diameter of the expansion retaining ring (6) is smaller than that of the expansion sealing ring (4) and larger than that of the slip (1).

2. The slip-in-one soluble bridge plug of claim 1, wherein: and a water line groove is formed in the outer circumferential surface of the expansion check ring (6).

3. A slip-in-one soluble bridge plug as claimed in claim 1 or 2, wherein: the slip (1) barrel is provided with separating ports (12) with openings at the upper end or the lower end and one end, the separating ports (12) are uniformly distributed on the circumference of the slip (1) barrel, and the separating ports (12) with openings at the upper end or the lower end are arranged at intervals.

4. A slip-in-one soluble bridge plug as claimed in claim 3, wherein: the outer periphery of the slip (1) is embedded with ceramic embedded blocks (7) in a distributed mode, the ceramic embedded blocks (7) are soluble ceramic materials, every 2 adjacent separating openings (12) are distributed along the axial direction of the slip (1), and the protruding outer diameter of the ceramic embedded blocks (7) is kept smaller than the outer diameter of the expansion check ring (6).

5. The slip-in-one soluble bridge plug of claim 4, wherein: an inclined angle is formed between the ceramic insert block (7) and the outer circumferential surface of the slip (1).

6. The slip-in-one soluble bridge plug of claim 5, wherein: radial guide grooves which are uniformly distributed along the circumference are formed in the connecting surface of the weak point stop block (3) and the slip (1), and meanwhile, corresponding matching structures with the radial guide grooves are arranged on the lower end face of the slip (1).