CN109505558B - Easy drilling bridge plug - Google Patents
Easy drilling bridge plug Download PDFInfo
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- CN109505558B CN109505558B CN201810924311.5A CN201810924311A CN109505558B CN 109505558 B CN109505558 B CN 109505558B CN 201810924311 A CN201810924311 A CN 201810924311A CN 109505558 B CN109505558 B CN 109505558B
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- mandrel
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- slip
- conical surface
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- 238000005553 drilling Methods 0.000 title claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000012856 packing Methods 0.000 claims description 17
- 239000000956 alloy Substances 0.000 abstract description 5
- 239000000725 suspension Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000003578 releasing effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003197 gene knockdown Methods 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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
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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)
- Gasket Seals (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of downhole tools, in particular to an easy-drilling bridge plug which comprises a mandrel, a nose cone, a tail cone, a locking ring and a gasket, wherein the tail cone is fixedly arranged on the outer side of the upper part of the mandrel, an annular clamping groove is formed in the inner wall of the lower part of the tail cone, the locking ring sleeved on the mandrel is arranged in the annular clamping groove, the outer wall of the mandrel below the tail cone is sequentially sleeved with the gasket, the slips, the slip seat and the end ring which are in clearance fit with the mandrel from top to bottom, the lower part of the mandrel is arranged in the nose cone, and the annular clamping groove, the locking ring, the gasket, the slips, the slip seat and the end ring are also arranged on the upper part of the nose cone. The invention has reasonable and compact structure, the mandrel and the lock ring are processed by adopting aluminum alloy materials with better drillability and stable performance, the mandrel and the lock ring are connected through metal threads, the connection strength is high, the connection performance is stable, the inner diameter of the mandrel is larger, the flowback is facilitated, the biting force with the sleeve is stronger, the suspension capability is stronger, and the site sliding site is greatly reduced under the same setting force condition.
Description
Technical Field
The invention relates to the technical field of downhole tools, in particular to an easy-to-drill bridge plug.
Background
In recent years, with the increasing of unconventional oil and gas field exploration, bridge plug-perforation combination is applied in the field of reservoir reconstruction and is wide, a bridge plug which is easy to drill is used as a core and a necessary tool for reservoir reconstruction, a plurality of products are already put forward at home and abroad, the structures of the products are basically similar, for example, glass fibers are used as a main body material of the bridge plug, a nose cone and a mandrel are fixed by adopting the combined action of threads and a pin shaft, and the like, and the following technical problems appear in practical application: (1) The depth of the slip occluding sleeve is insufficient, so that the bridge plug slides in the fracturing process; (2) The mandrel and the nose cone are made of glass fiber composite materials, and due to the characteristics of the materials, fibers in the glass fibers are easily cut off in the processing process of connecting threads, so that the strength of the threads is greatly reduced, and the phenomenon that the nose cone is connected with the mandrel to be invalid in the field use process occurs; (3) Because the mandrel is made of glass fiber material, the strength is lower than that of aluminum alloy material, and the performance stability is relatively poor, the inner diameter of the mandrel is smaller, so that the flowback throttling after fracturing is caused, and the final fracturing effect is influenced; (4) Under the high-temperature environment at the bottom of the well, the high-pressure rubber cylinder extrusion phenomenon occurs due to poor protection capability of two sides of the rubber cylinder, and finally, the situation of sealing failure of part of bridge plug products occurs.
Disclosure of Invention
The invention provides an easy-to-drill bridge plug, which overcomes the defects of the prior art, can effectively solve the problems that the existing easy-to-drill bridge plug is poor in protection capability at two sides of a rubber cylinder under a high-temperature well bottom environment, a high-pressure rubber cylinder extrusion phenomenon is easy to occur, and finally sealing failure is caused, and the connection failure caused by low connection strength between a nose cone, a tail cone and a mandrel on the existing easy-to-drill bridge plug is effectively solved, and the problems that the depth of a slip occlusion sleeve on the existing easy-to-drill bridge plug is insufficient and the bridge plug is easy to slip in the fracturing process are further solved.
The technical scheme of the invention is realized by the following measures: the easy-drilling bridge plug comprises a mandrel, a nose cone, a tail cone, a locking ring and a gasket, wherein the mandrel, the nose cone and the tail cone are all tubular, the locking ring is an easy-drilling metal ring, the mandrel is an easy-drilling metal shaft, ports on one side of the nose cone and one side of the tail cone are slope ports, the tail cone is fixedly arranged on the outer side of the upper part of the mandrel, the slope port end of the tail cone faces upwards, an annular clamping groove is formed in the inner wall of the lower part of the tail cone, the locking ring sleeved on the mandrel is arranged in the annular clamping groove, the locking ring is in threaded connection with the mandrel, the outer wall of the mandrel below the tail cone is sequentially sleeved with the gasket, the slips, the slip seat and the end ring which are in clearance fit with the mandrel from top to bottom, one section of outer wall of the port of the lower part of the mandrel is fixedly arranged in the nose cone, the slope port end of the nose cone faces downwards, an annular clamping groove is also formed in the inner wall of the upper part of the nose cone, the annular clamping groove is also arranged in the annular clamping groove, the annular clamping ring is sleeved on the mandrel and is in threaded connection with the mandrel, the upper end face of the head cone can limit the downward movement of the corresponding backing ring, the middle outer wall of the core shaft is sleeved with a rubber cylinder component, the upper and lower groups of backing rings, slips, slip seats, the end rings and the rubber cylinder component in the middle of the core shaft are limited between the upper and lower locking rings and are propped against each other in sequence, a cylindrical ball seat is fixedly arranged on the inner wall of the upper end opening of the core shaft, annular cutting grooves are arranged on the outer wall of the core shaft above the ball seat, a plurality of axial cuts are distributed on the outer wall of the slip seats on the upper and lower sides of the core shaft at intervals towards one side of the rubber cylinder component, the slip seats on the side are in a flap shape, a plurality of axial cuts are distributed on the outer wall of the side of the end ring, which is close to the rubber cylinder component, of the axial cuts enable the end ring on the side to be in a flap shape, the axial notch on the end ring and the axial notch on the slip seat are distributed in a staggered way, the outer wall on the other side of the slip seat is provided with annular oblique notch grooves distributed along the circumferential direction, and the cross section of each annular oblique notch groove is in a right-angle triangle shape with the inner part narrow and the outer part wide.
The following are further optimizations and/or improvements to the above-described inventive solution:
The rubber cylinder assembly comprises a main rubber cylinder and two auxiliary rubber cylinders distributed on the upper side and the lower side of the main rubber cylinder, the contact surface between the auxiliary rubber cylinders and the main rubber cylinder is a conical surface corresponding to each other, and one side of the auxiliary rubber cylinder, which is away from the contact surface of the main rubber cylinder, is also a conical surface.
The slip seat is cylindrical, an inner conical surface is arranged in one side of the slip seat, which is close to the auxiliary rubber cylinder, an axial notch is formed in the outer wall corresponding to the inner conical surface of the slip seat, a plurality of pieces of axial notches are distributed on the wall of the tapered cylinder at intervals, one side, which is away from the contact surface of the main rubber cylinder, of the auxiliary rubber cylinder is a conical surface and is inserted into the corresponding inner conical surface of the slip seat, an end ring propped against the auxiliary rubber cylinder is arranged in the inner conical surface of the slip seat, the end ring comprises a tapered cylinder and a sleeve ring, the sleeve ring and the tapered cylinder are sleeved on the mandrel, one end of the sleeve ring is fixedly connected with the small opening end of the tapered cylinder, the inner wall of the tapered cylinder is attached to the tapered surface, which is away from the contact surface of the main rubber cylinder, a plurality of axial notches are distributed on the wall of the tapered cylinder at intervals, the axial notches on the tapered cylinder enable the tapered cylinder to be distributed in a plurality of pieces of at intervals, and the axial notches on the tapered cylinder and the tapered cylinder are distributed in a dislocation manner, and the outer wall, which is away from one side of the end ring, of the end ring is also a tapered surface.
The slip comprises a sleeve and tooth plates, wherein the sleeve is sleeved on the outer side of a mandrel, at least two tooth plates are distributed on the outer wall of the sleeve at intervals, a split groove is formed between every two adjacent tooth plates, the inner side of each tooth plate is integrally connected with the outer wall of the sleeve, at least two tooth sections distributed at intervals are arranged on the outer side of each tooth plate, each tooth section is composed of teeth distributed in a staggered mode, the inside of one side of each slip close to a slip seat is an inner conical surface, and the conical surface on one side of each slip seat, deviating from an end ring contact surface, is inserted into the corresponding slip inner conical surface.
At least one limiting pin is arranged on the conical surface of one side, away from the end ring, of the slip seat, and one end of the inner side of the limiting pin is propped against the mandrel.
The lock ring is an aluminum alloy ring.
The mandrel is an aluminum alloy mandrel.
The invention has reasonable and compact structure, the mandrel and the lock ring are processed by adopting aluminum alloy materials with better drillability and stable performance, the mandrel and the lock ring are connected through metal threads, the connection strength is high, the connection performance is stable, the probability of connection failure is greatly reduced, and meanwhile, the mandrel adopts aluminum alloy materials with relatively high strength and stable performance, so the inner drift diameter of the mandrel is larger, and the flowback is facilitated. The clamping tooth sections on one tooth plate are at least two groups of clamping tooth sections which bite into the inner wall of the sleeve, the design is more scientific and reasonable than the slip on the existing easy-drilling bridge under the same setting force condition, and the clamping tooth sections have stronger clamping force with the sleeve, so that the hanging capability is stronger, the on-site sliding site is greatly reduced, the cross section of the annular inclined notch groove is in a right-angle triangle shape with the inner narrow outside wide, the annular inclined notch groove with the cross section in the right-angle triangle shape with the inner narrow outside wide is arranged on the slip seat, after the bridge plug is set, the slip seat is bent from the position of the annular inclined notch groove, the inner side surface of the annular inclined notch groove is in surface-to-surface contact during bending, and stronger protective capability is formed for a rubber cylinder, and meanwhile, the axial notches on the slip seat and the axial notches on the end ring are distributed in a staggered manner, so that the phenomenon of outflow and cracking of a rubber cylinder component can not be caused.
Drawings
Fig. 1 is a schematic view of a semi-sectional structure in front view of a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a semi-sectional structure of the slip.
Fig. 3 is a right side view of the structure shown in fig. 2.
Fig. 4 is an enlarged schematic view of the portion a in fig. 2.
FIG. 5 is a schematic diagram of a semi-sectional configuration of a slip bowl.
Fig. 6 is a right side view of the structure shown in fig. 5.
Fig. 7 is an enlarged schematic view of the portion B in fig. 5.
Fig. 8 is a schematic semi-sectional structure of an end ring.
Fig. 9 is a right side view of the structure shown in fig. 8.
The codes in the drawings are respectively: 1 is a mandrel, 2 is a nose cone, 3 is a tail cone, 4 is a lock ring, 5 is a backing ring, 6 is a slip, 601 is a sleeve, 602 is a tooth plate, 603 is a splitting groove, 604 is a tooth segment, 605 is a tooth, 7 is a slip seat, 701 is an inner conical surface, 8 is an end ring, 801 is a conical cylinder, 802 is a collar, 9 is a main rubber cylinder, 10 is a secondary rubber cylinder, 11 is an annular groove, 12 is an axial notch, 13 is an annular oblique notch groove, 14 is a limit pin, and 15 is a ball seat.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described below with reference to examples and figures:
As shown in figures 1 to 8, the easy-drilling bridge plug comprises a mandrel 1, a nose cone 2, a tail cone 3 and a locking ring 4, wherein the mandrel 1, the nose cone 2 and the tail cone 3 are all tubular, the locking ring 4 is an easy-drilling metal ring, the mandrel 1 is an easy-drilling metal shaft, ports on one side of the nose cone 2 and the tail cone 3 are inclined grooves, the tail cone 3 is fixedly arranged on the outer side of the upper part of the mandrel 1, the slope mouth end of the tail cone 3 faces upwards, an annular clamping groove is formed in the inner wall of the lower part of the tail cone 3, a locking ring 4 sleeved on the mandrel 1 is arranged in the annular clamping groove, the locking ring 4 is in threaded connection with the mandrel 1, a backing ring 5, a slip 6, a slip seat 7 and an end ring 8 which are in clearance fit with the mandrel 1 are sequentially sleeved on the outer wall of the mandrel 1 from top to bottom below the tail cone 3, one section of outer wall of the lower port of the mandrel 1 is fixedly arranged in the nose cone 2, the slope mouth end of the nose cone 2 faces downwards, an annular clamping groove is also formed in the inner wall of the upper part of the nose cone 2, a lock ring 4 sleeved on the mandrel 1 and in threaded connection with the mandrel 1 is also arranged in the annular clamping groove, the outer wall of the mandrel 1 above the nose cone 2 is also sleeved with another group of backing rings 5, slips 6, slip seats 7 and end rings 8 from bottom to top, the upper end surface of the nose cone 2 can limit the downward movement of the backing rings 5 corresponding to the nose cone, the middle outer wall of the mandrel 1 is sleeved with a rubber cylinder component, the upper and lower groups of backing rings 5, slips 6, slip seats 7, end rings 8 and the rubber cylinder component in the middle of the mandrel 1 are limited between the upper and lower lock rings 4 together and are propped against each other in sequence, a cylindrical ball seat 15 is fixedly arranged on the inner wall of an upper port of the mandrel 1, an annular slot 11 is arranged on the outer wall of the mandrel 1 above the ball seat 15, a plurality of axial cuts 12 are distributed on the outer walls of the slip seats 7 on the upper and lower sides of the mandrel 1 at intervals towards one side of the rubber cylinder component, the axial notch 12 makes the slip seat 7 at the side be in a petal shape, a plurality of axial notches 12 are also distributed on the outer wall of the end ring 8 close to one side of the rubber barrel component at intervals, the axial notch 12 makes the end ring 8 at the side be in a petal shape, the axial notch 12 on the end ring 8 and the axial notch 12 on the slip seat 7 are distributed in a dislocation mode, annular oblique notch grooves 13 distributed along the circumferential direction are arranged on the outer wall of the other side of the slip seat 7, and the cross section of each annular oblique notch groove 13 is in a right-angle triangle shape with the inner part being narrow and the outer part being wide.
In actual use, the invention is connected with the mandrel 1 at one end of the tail cone 3 through the bridge plug setting tool in a threaded manner, then the invention is put into the inside of the tail cone, high-pressure gas generated in the combustion chamber through slow-burning powder in the setting tool further generates thrust, the thrust acts on the propelling sleeve and the backing ring 5 near one end of the tail cone 3, the backing ring 5 sequentially transmits the thrust downwards, the slips 6 at the upper part of the mandrel 1, the slip seat 7 and the end ring 8 sequentially move downwards and squeeze the rubber sleeve component, the end ring 8, the slip seat 7 and the slips 6 at the lower part, finally the slips 6 are firmly clamped on the inner wall of the sleeve, and the rubber sleeve component is expanded and deformed to establish sealing with the inner wall piece of the sleeve, so that the setting is completed.
In the setting process, the slip seat 7 on the upper side and the lower side of the mandrel 1 is outwards propped up at the position of the axial notch 12 and is bent at the position of the annular oblique notch 13 through the axial notch 12 and the annular oblique notch 13 arranged on the slip seat 7, when the slip seat 7 is bent at the position of the annular oblique notch 13, the two inner sides of the annular oblique notch 13 can be in surface-to-surface contact, the cross section of the annular notch at the position of the existing easy-to-drill bridge plug is rectangular, and when the slip seat 7 is bent at the position of the annular notch, point-to-surface contact is easy to occur, so that the invention can form stronger protective capability for a rubber sleeve assembly, the end ring 8 on the upper side and the lower side of the mandrel 1 is outwards expanded through the axial notch 12 in the extruding process, and the axial notch 12 on the end ring 8 and the axial notch 12 on the slip seat 7 are distributed in a staggered manner, so that the rubber sleeve assembly cannot be extruded into the end ring 8 and the axial notch 12 on the slip seat 7 in the deforming process, and the rubber sleeve assembly cannot be broken.
With the increasing of high-pressure gas generated by slow-burning gunpowder, the thrust applied to the backing ring 5 of the tail cone 3 is also greater and greater according to the principle of acting force and reaction force, through the thrust action, the upward pulling force is applied to the mandrel 1, and with the increase of the pulling force, the mandrel 1 breaks at the annular cutting groove 11, so that the setting tool is separated from the invention, the releasing action is completed, after releasing is completed and perforation is performed, the well entering and exiting tool is started, the fracturing ball is thrown, and after the fracturing ball blocks the hole in the ball seat 15, the fracturing construction can be performed on the upper layer of the bridge plug.
The mandrel 1 and the lock ring 4 are processed by adopting drillable metal materials with better drillability and stable performance, and the mandrel 1 and the lock ring 4 are connected through metal threads, so that the mandrel 1 and the lock ring 4 can bear most of the tensile force at the threaded connection part when the tensile force on the mandrel 1 is continuously increased, and the tensile force born by the tail cone 3 and the nose cone 2 which are made of glass fiber materials is very small. The easy-to-drill metal is a known material. Can be selected according to actual conditions.
The mandrel 1 made of glass fiber is low in strength, easy to drill metal materials and relatively poor in performance stability, so that the mandrel 1 can effectively solve the problems that the existing mandrel is small in inner diameter, flowback and throttling after fracturing are caused, and the final fracturing effect is affected.
The easy-to-drill bridge plug can be further optimized or/and improved according to actual needs:
As shown in fig. 1, the rubber cylinder assembly comprises a main rubber cylinder 9 and two auxiliary rubber cylinders 10 distributed on the upper side and the lower side of the main rubber cylinder 9, the contact surfaces between the auxiliary rubber cylinders 10 and the main rubber cylinder 9 are conical surfaces corresponding to each other, and one side of the auxiliary rubber cylinder 10, which is away from the contact surface of the main rubber cylinder 9, is also a conical surface.
The packing element subassembly comprises main packing element 9 and two vice packing elements 10 of distributing in main packing element 9 upper and lower both sides, and the packing element subassembly is by the extruded in-process, and the conical surface design of vice packing element 10 and main packing element 9 can make both realize closely laminating more easily, and two vice packing elements 10 and a main packing element 9 can form a powerful seal section in the sleeve pipe, guarantee to sit and seal can more reliable smooth realization of stability.
As shown in fig. 1, 5, 6 and 7, the slip seat 7 is cylindrical, an inner conical surface 701 is formed in one side of the slip seat 7 close to the auxiliary rubber cylinder 10, an axial notch 12 is formed on the outer wall corresponding to the inner conical surface 701 of the slip seat 7, the one side of the inner conical surface 701 of the slip seat 7 is in a plurality of pieces of spaced-apart flap shapes, one side of the auxiliary rubber cylinder 10, which faces away from the contact surface of the main rubber cylinder 9, is a conical surface and is inserted into the inner conical surface 701 of the corresponding slip seat 7, an end ring 8 abutted against the auxiliary rubber cylinder 10 is arranged in the inner conical surface 701 of the slip seat 7, the end ring 8 comprises a conical cylinder 801 and a sleeve ring 802, the sleeve ring 802 and the conical cylinder 801 are sleeved on the mandrel 1, one end of the sleeve ring 802 is fixedly connected with the small opening end of the conical cylinder 801, the inner wall of the conical cylinder 801 is attached to the conical surface of the auxiliary rubber cylinder 701, the outer wall of the conical cylinder 801 faces away from the contact surface of the main rubber cylinder 9, a plurality of pieces of axial notches 12 are also spaced-apart from the wall of the conical cylinder 801, the axial notches 12 are also distributed on the wall of the conical cylinder 801, which faces away from the inner conical surface of the conical cylinder 701, the axial notches 12 are distributed on the inner conical surface of the conical cylinder 801, which faces away from the conical surface 7, and are distributed on the axial notches 12, which are opposite sides of the conical surface of the conical notch 7, which are opposite to the axial notch 12.
The design of the inner conical surface 701 on one side of the slip seat 7 is also in order to be well tightly attached to the conical barrel 801 side of the end ring 8 when being pushed by high-pressure gas, so that the realization of setting is facilitated, and when the high-pressure gas is pushed to be set, the axial notch 12 side of the slip seat 7 and the conical barrel 801 side of the end ring 8 are outwards opened, so that stronger protective capability is formed on a rubber barrel assembly, and damage to the rubber barrel assembly by complex environments such as high temperature and high pressure in a well is reduced.
As shown in fig. 1 to 4, the slip 6 comprises a sleeve and tooth plates 602, the sleeve 601 is sleeved on the outer side of the mandrel 1, at least two tooth plates 602 are distributed on the outer wall of the sleeve 601 at intervals, split grooves 603 are arranged between adjacent tooth plates 602, the inner side of each tooth plate 602 is integrally connected with the outer wall of the sleeve 601, at least two tooth sections 604 distributed at intervals are arranged on the outer side of each tooth plate 602, each tooth section 604 is composed of teeth 605 distributed in a staggered mode, the inner portion of one side, close to the slip 6, of the slip 6 is an inner conical surface, and the conical surface, facing away from the contact surface of the end ring 8, of the slip 6 is inserted into the corresponding inner conical surface of the slip 6.
Under the action of high-pressure gas thrust generated by slow-burning powder in a setting tool, the slips 6 are broken into a plurality of blocks from the splitting grooves 603 in the setting process, and the clamping teeth 605 which are distributed in a staggered mode on the clamping tooth sections 604 are more scientific and reasonable than the design of the slips 6 on the existing easy-to-drill bridge plug under the condition of the same setting force, compared with the clamping teeth 605 with the same height on the existing easy-to-drill bridge plug slips 6, at least two groups of clamping tooth sections 604 on one tooth plate 602 bite into the inner wall of a sleeve, and the clamping force with the sleeve is stronger, so that the hanging capacity of the invention is stronger, and the on-site sliding is greatly reduced.
As shown in fig. 1 and 5, at least one limiting pin 14 is mounted on the conical surface of the slip bowl 7 at the side away from the end ring 8, and one end of the limiting pin 14 is propped against the mandrel 1.
Because the backing ring 5, the slips 6, the slip seat 7 and the end ring 8 on the outer wall of the mandrel 1 are in clearance fit with the mandrel 1, before the setting is carried out by installing the invention, the backing ring, the slips 6 and the end ring 8 can slide up and down on the mandrel 1, in order to avoid the phenomenon that the sliding elements on the mandrel 1 knock down the rubber cylinder assembly before use, further influence the subsequent setting effect, the limiting pin 14 slightly abuts against the mandrel 1 before use, thereby properly limiting the freedom degree of the slip seat 7, and further indirectly limiting the freedom degrees of the backing ring 5, the slips 6 and the end ring 8 on the mandrel 1, and further achieving the purpose of protecting the rubber cylinder assembly.
According to actual needs, the lock ring 4 is preferably an aluminum alloy ring; the mandrel 1 is preferably an aluminum alloy mandrel.
The mandrel 1 and the lock ring 4 are processed by adopting aluminum alloy materials with better drillability and stable performance, and the mandrel 1 and the lock ring 4 are connected through metal threads, so that the mandrel 1 and the lock ring 4 can bear most of the tensile force at the threaded connection part when the tensile force on the mandrel 1 is continuously increased, and the tensile force born by the tail cone 3 and the nose cone 2 which are made of glass fiber materials is little.
The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (10)
1. The easy-drilling bridge plug is characterized by comprising a mandrel, a nose cone, a tail cone, a locking ring and a gasket, wherein the mandrel, the nose cone and the tail cone are all tubular, the locking ring is an easy-drilling metal ring, the mandrel is an easy-drilling metal shaft, ports on one side of the nose cone and one side of the tail cone are slope ports, the tail cone is fixedly arranged on the outer side of the upper part of the mandrel, the slope port end of the tail cone faces upwards, an annular clamping groove is formed in the inner wall of the lower part of the tail cone, the locking ring sleeved on the mandrel is arranged in the annular clamping groove, the locking ring is in threaded connection with the mandrel, the outer wall of the mandrel below the tail cone is sequentially sleeved with a backing ring, slips, a slip seat and an end ring which are in clearance fit with the mandrel from top to bottom, one section of outer wall of the port of the lower part of the mandrel is fixedly arranged in the nose cone, the slope port end of the nose cone faces downwards, the annular clamping groove is also formed in the inner wall of the upper part of the nose cone, the annular clamping groove is also provided with the locking ring sleeved on the mandrel and is in threaded connection with the mandrel, the upper end face of the head cone can limit the downward movement of the corresponding backing ring, the middle outer wall of the core shaft is sleeved with a rubber cylinder component, the upper and lower groups of backing rings, slips, slip seats, the end rings and the rubber cylinder component in the middle of the core shaft are limited between the upper and lower locking rings and are propped against each other in sequence, a cylindrical ball seat is fixedly arranged on the inner wall of the upper end opening of the core shaft, annular cutting grooves are arranged on the outer wall of the core shaft above the ball seat, a plurality of axial cuts are distributed on the outer wall of the slip seats on the upper and lower sides of the core shaft at intervals towards one side of the rubber cylinder component, the slip seats on the side are in a flap shape, a plurality of axial cuts are distributed on the outer wall of the side of the end ring, which is close to the rubber cylinder component, of the axial cuts enable the end ring on the side to be in a flap shape, the axial notch on the end ring and the axial notch on the slip seat are distributed in a staggered way, the outer wall on the other side of the slip seat is provided with annular oblique notch grooves distributed along the circumferential direction, and the cross section of each annular oblique notch groove is in a right-angle triangle shape with the inner part narrow and the outer part wide.
2. The bridge plug according to claim 1, wherein the packing element assembly comprises a main packing element and two auxiliary packing elements distributed on the upper and lower sides of the main packing element, the contact surfaces between the auxiliary packing elements and the main packing element are conical surfaces corresponding to each other, and the side of the auxiliary packing element facing away from the contact surface of the main packing element is also conical surface.
3. The bridge plug according to claim 2, wherein the slip seat is cylindrical, the inside of the slip seat is an inner conical surface at one side close to the auxiliary rubber cylinder, the axial notch is arranged on the outer wall corresponding to the inner conical surface of the slip seat and enables the one side of the inner conical surface of the slip seat to be in a plurality of pieces of petal shapes distributed at intervals, one side of the auxiliary rubber cylinder, which faces away from the main rubber cylinder, is a conical surface and is inserted into the corresponding inner conical surface of the slip seat, an end ring propped against the auxiliary rubber cylinder is arranged in the inner conical surface of the slip seat, the end ring comprises a conical cylinder, a lantern ring, the lantern ring and the conical cylinder are sleeved on the mandrel, one end of the lantern ring is fixedly connected with the small opening end of the conical cylinder, the inner wall of the conical cylinder is attached to the conical surface of the auxiliary rubber cylinder, which faces away from the main rubber cylinder, the outer wall of the conical cylinder is attached to the inner conical surface of the slip seat, a plurality of pieces of axial notches are distributed at intervals on the wall of the conical cylinder, the axial notch on the conical cylinder enables the conical cylinder to be in a plurality of pieces of petal shapes distributed at intervals, the axial notch on the conical cylinder is misplaced with the axial notch on the outer wall of the conical cylinder, which faces away from the side of the end ring is also attached to the conical surface.
4. The bridge plug easy to drill according to claim 3, wherein the slips comprise a sleeve and tooth plates, the sleeve is sleeved on the outer side of the mandrel, at least two tooth plates are distributed on the outer wall of the sleeve at intervals, split grooves are arranged between adjacent tooth plates, the inner side of each tooth plate is integrally connected with the outer wall of the sleeve, at least two tooth sections distributed at intervals are arranged on the outer side of each tooth plate, each tooth section is composed of teeth distributed in a staggered mode, the inner conical surface of one side, close to the slip seat, of each slip is an inner conical surface, and the conical surface of one side, away from the end ring contact surface, of each slip seat is inserted into the corresponding slip inner conical surface.
5. An easy-to-drill bridge plug according to claim 1, 2,3 or 4, wherein the slip bowl is provided with at least one stop pin on a conical surface facing away from the end ring, one end of the stop pin being pressed against the mandrel.
6. The easy drill bridge plug of claim 1 or 2 or 3 or 4, wherein the locking ring is an aluminum alloy ring.
7. The easy drill bridge plug of claim 5, wherein the locking ring is an aluminum alloy ring.
8. The easy-to-drill bridge plug of claim 1 or 2 or 3 or 4 or 7, wherein the mandrel is an aluminum alloy mandrel.
9. The easy drill bridge plug of claim 5, wherein the mandrel is an aluminum alloy mandrel.
10. The easy drill bridge plug of claim 6, wherein the mandrel is an aluminum alloy mandrel.
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| CN201810924311.5A CN109505558B (en) | 2018-08-14 | 2018-08-14 | Easy drilling bridge plug |
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| CN201810924311.5A CN109505558B (en) | 2018-08-14 | 2018-08-14 | Easy drilling bridge plug |
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| CN109505558B true CN109505558B (en) | 2024-04-26 |
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| CN114856520B (en) * | 2021-02-04 | 2024-06-25 | 中国石油天然气集团有限公司 | Ball seat type soluble bridge plug |
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|---|---|---|---|---|
| US7810558B2 (en) * | 2004-02-27 | 2010-10-12 | Smith International, Inc. | Drillable bridge plug |
| CN106437613B (en) * | 2016-09-30 | 2019-05-10 | 陈爱民 | Reducer support rings for bridge plugs and bridge plugs |
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| US9845658B1 (en) * | 2015-04-17 | 2017-12-19 | Albany International Corp. | Lightweight, easily drillable or millable slip for composite frac, bridge and drop ball plugs |
| CN104879090A (en) * | 2015-06-12 | 2015-09-02 | 西南石油大学 | Fast-drilling composite bridge plug adopting single-slip double-acting structure |
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| CN109505558A (en) | 2019-03-22 |
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Effective date of registration: 20201109 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Xibu Drilling Engineering Co.,Ltd. Address before: 834000 Drilling Engineering Technology Research Institute, No. 98 Youyi Road, the Xinjiang Uygur Autonomous Region, Karamay Applicant before: CNPC Xibu Drilling Engineering Co.,Ltd. |
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