CN112647891A - Full-soluble bridge plug - Google Patents
Full-soluble bridge plug Download PDFInfo
- Publication number
- CN112647891A CN112647891A CN202011553271.1A CN202011553271A CN112647891A CN 112647891 A CN112647891 A CN 112647891A CN 202011553271 A CN202011553271 A CN 202011553271A CN 112647891 A CN112647891 A CN 112647891A
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- slip
- hollowed
- bridge plug
- guide shoe
- assembly
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- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims description 32
- 230000004323 axial length Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 5
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a fully soluble bridge plug which comprises a hollow guide shoe, a split slip assembly, an open slip guide groove, a protective bowl, a rubber cylinder, a central body and a pull rod assembly, wherein the hollow guide shoe, the split slip assembly, the open slip guide groove and the central tube are all arranged on the pull rod assembly, the protective bowl and the rubber cylinder are arranged between the open slip guide groove and an expanded part at the right end of the central tube, the rubber cylinder is arranged between the two protective bowls, the protective bowl and the rubber cylinder are arranged on a column section of the central tube through respective central holes, and one end of a pushing cylinder is connected with the expanded part of the central tube. The invention can reduce the outer diameter of the bridge plug without influencing the movement effect of pushing the liquid to the bridge plug; the dissolving of the bridge plug can be accelerated through the design of the hollow guide shoe.
Description
Technical Field
The invention belongs to the technical field of petroleum engineering equipment, and particularly relates to a fully-soluble bridge plug.
Background
The soluble bridge plug can temporarily plug the oil, gas, water, leakage and other layers, can perform high-pressure fracturing construction operation on a producing layer on the upper portion of the soluble bridge plug, and can be automatically dissolved under the conditions of liquid and temperature in a well after the fracturing construction operation, so that a full channel of a production casing is provided. At present, the tool is mainly applied to shale gas well stratum reconstruction.
In consideration of the trafficability of the bridge plug in the wellbore, the smaller the outer diameter of the bridge plug is, the easier the bridge plug is to travel through the wellbore, and the larger the outer diameter of the bridge plug is, the less the bridge plug is likely to travel through the wellbore.
In addition, the locking mechanism is used as a functional component for preventing the rubber sleeve from retracting, a single thread structure design is adopted, the thread can only advance and cannot retreat, when the rubber sleeve is compressed by thrust, the locking mechanism enters a locking state, after the thrust is cancelled, the resilience force of the rubber sleeve acts on the locking mechanism, and the rubber sleeve is consistently in a compression state because the locking mechanism is in the locking state and cannot retreat.
Meanwhile, the technical index of the current soluble bridge plug is 130 ℃/70MPa, the use requirements of temperature and pressure are well met in field use, and the problems of most of the prior similar products are solved. However, with the change of field conditions, especially the change of dissolution parameters and dissolution time brought by construction progress, the bridge plug structure is simplified, the quantity of insoluble substances is reduced, the length of the bridge plug is shortened, and the dissolution speed is accelerated, so that the use requirement is better met.
Finally, when the bridge plug is set, the guide shoe plays a supporting role on the bottom of the slip, effective seat clamping of the slip is ensured, and in order to ensure enough strength of the guide shoe, the guide shoe is generally of a solid structure, so that the total volume is large, the contact area with liquid is small, and the dissolving time is long.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a fully soluble bridge plug, and through the design of a pumping ring, the outer diameter of the bridge plug can be reduced, and the effect of pushing liquid to the bridge plug to move is not influenced; the dissolving of the bridge plug can be accelerated through the design of the hollow guide shoe.
The invention adopts the following technical scheme:
a fully soluble bridge plug comprises a hollow guide shoe, a split slip assembly, an open slip guide groove, a protective bowl, a rubber barrel, a central body and a pull rod assembly. The hollow guide shoe, the split type slip assembly, the open type slip guide groove and the central pipe are all arranged on the pull rod assembly. The protective bowls and the rubber cylinders are arranged between the open type slip guide groove and the expanded part at the right end of the central pipe, the rubber cylinders are arranged between the two protective bowls, the protective bowls and the rubber cylinders are arranged on the column section of the central pipe through respective central holes, and one end of the push cylinder is connected with the expanded part of the central pipe.
The external thread part of the hollow guide shoe is used for being connected with the internal thread of the pumping ring.
The length of the pumping ring is within 20mm, and the outer circumferential surface and one side end surface are subjected to chamfering treatment.
The hollow guide shoe is integrally hollow cylindrical, one end face of a hollow guide shoe base body is milled to form a hollow circular table and a front end face around the hollow circular table, the front end face is lower than the end face of the hollow circular table by 3cm, radial chutes are uniformly distributed on the front end face, the radial chutes are outwards arranged from the position close to the hollow circular table to the position connected with the outer circumferential face, the depth of the radial chutes is gradually increased, the front end face and the outer circumferential face of the hollow guide shoe base body are subjected to fillet treatment, and the included angle between the radial chutes and the front end face is 7 degrees.
Each radial inclined groove is internally provided with a hollowed through hole which is communicated with the rear end face, the outer circumferential surface is provided with pin holes communicated with the central hole, the number of the pin holes is the same as that of the hollowed through holes, and the central axis of each pin hole and the normal direction of the adjacent hollowed through hole form an acute angle of 30 degrees when viewed from one side of the end face. The number of the pin holes and the hollow through holes is 6.
An external thread is further processed on the outer circumferential surface of the rear side of the pin hole, a tool withdrawal groove is further processed at the joint of the external thread and the pin hole, the position where the outer circumferential surface is connected with the rear end surface is subjected to chamfering treatment, and the chamfering angle is 45 degrees.
4 radial flat grooves are milled on the rear end face and are formed from the central hole to the external thread face.
The hollow guide shoe is connected with the end part of the pull rod assembly in a matched mode through the central hole, and the setting pin is connected with the first step part of the pull rod assembly through the pin hole of the hollow guide shoe, so that the hollow guide shoe is installed and fixed at the end part of the pull rod assembly.
The open type slip guide groove uses a center hole as a circle to process an oblique cone surface which is the same as the split type slip assembly in quantity and matched with an inner cone surface of the slip assembly in resolution, the joint of the outer cone surface and the right end surface is processed through a fillet, a hollow hexagonal frustum formed by milling is arranged in the middle of the right end surface, an internal thread is processed on the inner circumferential surface of the open type slip guide groove, and a screw hole communicated to the internal thread is formed in the outer cone surface.
The open slip guide slot is mounted to the second section of the drawbar assembly via a lock ring, a center tube. The catch passes through threaded connection inside open slips guide way, and the inside of catch has the internal thread, and it is connected through internal thread and center tube realization. And the anti-rotation screw penetrates through a screw hole on the open type slip guide groove to enter the C-shaped bayonet of the locking ring, so that the locking ring is prevented from rotating in the central pipe.
The split type slip assembly is matched between the slip guide groove and the hollowed-out guide shoe, and when the open type slip guide groove is stressed and is axially extruded towards the hollowed-out guide shoe, the split type slip assembly can be driven to move outwards along the radial direction by the combined force of the open type slip guide groove and the hollowed-out slip assembly and the wedge cooperation of the hollowed-out guide shoe and the split type slip assembly.
The left end face of the split type slip assembly is matched and connected with a radial chute wedge of the hollow guide shoe, and the inner conical surface and the right end face of the other end of the split type slip assembly are matched with a tapered conical surface wedge of the open type slip guide groove. Equidistant grooves are further formed in the outer end face of the split type slip assembly from left to right, and a slip hoop I, slip teeth and a slip hoop II are respectively installed in each groove.
The pull rod assembly is of a stepped shaft type structure and is divided into 5 parts, the axial length of the first part is larger than that of the second part, the axial length of the second part is larger than that of the fifth part, the axial length of the fifth part is larger than that of the third part, the axial length of the third part is larger than that of the fourth part, the fourth part is conical, the fifth part is hollow, the hollow part of the fifth part is a threaded hole, and the outer circumferential surfaces of the fifth part and the first part are further provided with screw holes.
The hollow guide shoe, the setting pin, the slip hoop I, the split slip assembly, the slip teeth, the slip hoop II, the open slip guide groove, the locking ring, the anti-rotation screw, the central pipe, the protective bowl, the rubber cylinder, the phi 65 soluble ball and the pumping ring are all soluble metals, and the pull rod assembly and the push cylinder are made of alloy steel materials.
The invention relates to a using method of a fully soluble bridge plug, which comprises the following steps:
And 2, pumping a liquid into the sleeve, conveying the bridge plug to a preset position, applying an acting force to the central tube through the push cylinder, opening the split slip assembly along the inclined plane under the extrusion action, engaging the outer circumferential surface of the split slip assembly with the inner wall of the sleeve, enabling the external threads of the central tube to enter the internal threads of the locking ring (the external threads on the central tube are right, the internal threads on the locking ring are left, and after the central tube is extruded to enter the locking ring, the central tube cannot exit the locking ring due to the mutual engagement of the threads), forming self-locking, and compressing and expanding the rubber cylinder to be attached to the inner wall of the sleeve.
And 3, after setting, shearing the setting pin, and drawing the pull rod assembly out of the bridge plug.
And 4, throwing the phi 65 soluble ball, pumping liquid, and conveying the phi 65 soluble ball to the ball seat position on the upper end surface of the bridge plug central pipe to realize sealing and seal the upper and lower sections of the shaft.
The invention has the beneficial effects that:
1. according to the invention, the well shaft trafficability changes in combination with different well conditions and different operation sections, and in order to combine the pump efficiency and trafficability comprehensive factors of the bridge plug tubular column, the end part of the bridge plug guide shoe is provided with the split pumping ring which is in threaded connection with the guide shoe, so that the field flexible replacement is convenient.
The pumping ring structure adopts split type design, and the pumping ring can configure the pumping ring that the external diameter is greater than the suitable size of bridging plug body according to the on-the-spot needs, and length is within 20mm, so both can be convenient for pass through the sleeve pipe to still can keep better liquid propelling movement effect, according to the on-the-spot needs of difference, the model that only needs to change the pumping ring just can satisfy need, does not need the overall change bridging plug model, the field usage of being convenient for.
2. On the premise of retaining the locking function, the invention changes the conventional independent locking mechanism into an embedded locking mechanism, thereby not only simplifying the structure, but also effectively shortening the overall length. The conventional locking ring is designed at the right end or the left end of the rubber cylinder, so that the overall length of the bridge plug is increased. On the other hand, the embedded locking mechanism can greatly reduce the liquid scouring force in the pumping process and prolong the maximum setting aging of the bridge plug.
3. According to the invention, the guide shoe body is in a hollow design, 6 through holes are processed at the bottom of the slip, and the design of staggering 30 degrees with the shear pin ensures the integral strength of the guide shoe, the pin can be effectively sheared under the axial stress condition according to the design, and the hollow design of the through hole at the bottom can ensure that liquid can have more contact area with the guide shoe, so that the dissolving time is shortened.
Meanwhile, the general guide shoe and the bridge plug body are designed integrally, so that the guide shoe and the slip are separated when the bridge plug works, liquid can be contacted more fully, and the dissolving time can be shortened.
Drawings
FIG. 1 is a structural cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of a phi 65 soluble sphere;
FIG. 3 is an isometric view of the present invention;
FIG. 4 is a schematic view of an open slip guide groove;
FIG. 5 is a schematic view of a split slip assembly;
FIG. 6(a), FIG. 6(b), FIG. 6(c) and FIG. 6(d) are schematic views of the hollow-out guide structure;
FIG. 7 is a schematic view of a pumping ring configuration of the present invention;
FIG. 8 is a schematic view of a half-section of an open slip guide groove;
FIG. 9 is a right side view of the open slip guide slot;
FIG. 10 is an initial state diagram of the present invention;
FIG. 11 is a setting state diagram of the present invention;
fig. 12 is a releasing state diagram of the present invention.
In the figure: 1000-soluble bridge plug, 1-hollow guide shoe, 2-setting pin, 3-slip hoop I, 4-split slip assembly, 5-slip tooth, 6-slip hoop II, 7-open slip guide groove, 8-locking ring, 9-anti-rotation screw, 10-central tube, 11-protective bowl, 12-rubber cylinder, 13-phi 65 soluble ball, 14-pumping ring, 15-pull rod assembly, 16-pushing cylinder, 17-sealing ring, 18-conical pad and 19-quilt cover.
101-pin hole, 102-hollow through hole, 103-front end face, 104-hollow circular truncated cone, 105-spoke chute, 106-outer circumference face, 107-rear end face, 108-center hole, 109-spoke flat groove, 1010-external thread, 1011-tool withdrawal groove and 1012-chamfer;
401-left end face, 402-inner cone face and 403-right end face;
701-inclined conical surface, 702-internal thread, 703-screw hole, 704-hollow hexagonal frustum, 705-right end surface and 706-external conical surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, a soluble bridge plug 1000 of the present invention is provided with a push cylinder 16 mounted at the end thereof.
The soluble bridge plug 1000 comprises a hollow guide shoe 1, a split slip assembly 4, an open slip guide groove 7, a protective bowl 11, a rubber barrel 12, a central body 10 and a pull rod assembly 15.
As shown in fig. 3-5, the hollowed-out guide shoe 1, the split slip assembly 4, the open slip guiding groove 7, and the center pipe 10 are all mounted on the pulling rod assembly 15.
The protective bowls 11 and the rubber cylinders 12 are arranged between the open type slip guide groove 7 and the expanded part at the right end of the central pipe 10, the rubber cylinders 12 are arranged between the two protective bowls 11, the protective bowls 11 and the rubber cylinders 12 are arranged on the column section of the central pipe 10 through respective central holes, and one end of the push cylinder 17 is connected with the expanded part of the central pipe 10. The other end of the central tube 10 is provided with a conical pad 18 through a back cap 19, and the contact part of the conical pad 18 and the central hole 10 is also sealed through a sealing ring 10.
The split type slip assembly 4 is matched between the slip guide groove 7 and the hollowed-out guide shoe 1, when the open type slip guide groove 7 is stressed and is axially extruded towards the hollowed-out guide shoe direction, the open type slip guide groove 7 and the split type slip assembly 4 are matched with each other through wedges and the hollowed-out guide shoe 1 and the split type slip assembly 4 are matched with each other through the wedges, and the combined force of the open type slip guide groove 7 and the hollowed-out guide shoe 1 to the split type slip assembly 4 can drive the split type slip assembly 4 to move outwards along the radial direction to achieve the sitting clamping.
The pull rod assembly 15 is of a stepped shaft type structure and is divided into 5 parts, wherein the axial length of the first part is larger than that of the second part, the axial length of the second part is larger than that of the fifth part, the axial length of the fifth part is larger than that of the third part, the axial length of the third part is larger than that of the fourth part, the fourth part is conical, the fifth part is hollow, the hollow part of the fifth part is a threaded hole, and the outer circumferential surfaces of the fifth part and the first part are further provided with screw holes.
Referring to fig. 6(a) -6 (d), the hollow guide shoe 1 is provided with a pin hole 101 and a hollow through hole 102.
The hollow guide shoe 1 is integrally hollow cylindrical, one end face of a base body of the hollow guide shoe 1 is milled to form a hollow circular truncated cone 104 and a front end face 103 around the hollow circular truncated cone, the front end face 103 is lower than the end face of the hollow circular truncated cone by 3cm, radial chutes 105 are uniformly distributed on the front end face 103, the radial chutes 105 are outwards arranged from the position close to the hollow circular truncated cone 104 to the position connected with an outer circumferential face 106, the depth of the radial chutes 105 is gradually increased, the front end face 103 and the outer circumferential face 106 of the hollow guide shoe base body are subjected to fillet treatment, and the included angle between the radial chutes 105 and the front end face 103 is 7 degrees.
Each radial inclined groove 105 is internally provided with a hollowed through hole 102, the hollowed through holes 102 are communicated with a rear end face 107, an outer circumferential surface 106 is provided with pin holes 101 communicated with a central hole 108, the number of the pin holes 101 is the same as that of the hollowed through holes 102, and when viewed from one side of the end face, the central axis of each pin hole 101 forms an acute angle of 30 degrees with the normal direction of the adjacent hollowed through hole 102. The number of the pin holes 101 and the hollowed-out through holes 102 is 6.
An external thread 1010 is further processed on the outer circumferential surface 106 on the rear side of the pin hole 101, a relief groove 1011 is further processed at the joint of the external thread 1010 and the pin hole 101, the joint position of the outer circumferential surface 106 and the rear end surface 107 is processed by a chamfer 1012, and the angle of the chamfer 1012 is 45 degrees.
4 radial flat grooves 109 are milled on the rear end face 107, and the radial flat grooves 109 are formed from the central hole 108 to the surface of the external thread 1010.
The hollow guide shoe 1 is connected with the end part of the pull rod assembly 15 through the central hole 108 in a matched mode, and the setting pin 2 is connected with the first step part of the pull rod assembly 15 through the pin hole 101 of the hollow guide shoe 1, so that the hollow guide shoe 1 is installed and fixed at the end part of the pull rod assembly 15.
According to the invention, the guide shoe adopts a hollow design, 6 through holes are processed at the bottom of the split type slip assembly 4, and the through holes and the pin holes are staggered by 30 degrees, so that the overall strength of the guide shoe is ensured, the pins can be effectively sheared under the condition of axial stress according to the design, and due to the hollow design of the through holes at the bottom, liquid can have more contact area with the guide shoe, and the dissolving time is shortened.
The external thread 1010 of the hollowed-out guide 1 is used for being connected with the internal thread of the pumping ring 14.
As shown in fig. 7, the length of the pumping ring 14 is within 20mm, and the outer circumferential surface and one side end surface are chamfered. Have multiple different specifications, the radial thickness of different specifications is different, consequently has better liquid propelling movement effect. According to different field requirements, the pumping requirement can be met only by replacing the model of the pumping ring 14, and the model 1000 of the bridge plug does not need to be replaced in total, so that the field use is more convenient.
As shown in fig. 1, 3 and 5, the slip assembly is a split slip assembly. The left end surface 401 of the split type slip assembly 4 is connected with the inclined wedge of the radial inclined groove 105 of the hollowed-out guide shoe 1 in a matched mode, and the inner conical surface 402 and the right end surface 403 at the other end are matched with the inclined wedge surface 701 of the open type slip guide groove 7 in an inclined wedge mode. Equidistant grooves are further formed in the outer end face of the split type slip assembly 4 from left to right, and slip hoops I3, slip teeth 5 and slip hoops II 6 are respectively installed in the grooves.
As shown in fig. 3, 4, 8 and 9, the open slip guide groove 7 is an open slip guide groove 7, the open slip guide groove 7 processes inclined conical surfaces 701 which are the same as the number of the split slip assemblies 4 and are matched with the inner conical surface 402 of the slip assembly 4 on an outer conical surface 706 by taking a central hole as a circle, the joint of the outer conical surface 706 and a right end surface 705 is subjected to chamfering treatment, a hollow hexagonal frustum 704 formed by milling is arranged in the middle of the right end surface 705, an inner thread 702 is processed on the inner circumferential surface of the open slip guide groove 7, and a screw hole 703 communicated with the inner thread 702 is formed on the outer conical surface 706.
The open slip guide slot 7 is mounted to the second section of the drawbar assembly 15 via the lock ring 8, the base pipe 10. The locking ring 8 is connected inside the open slip guide groove 7 through an external thread, and the inside of the locking ring 8 has an internal thread, which is connected with the center pipe 10 through an internal thread. And the anti-rotation screw 12 passes through the screw hole on the open type slip guide groove 7 and enters the C-shaped bayonet of the locking ring 8, so that the locking ring is prevented from rotating in the central pipe 10.
On the premise of keeping the locking function of the locking ring 8, the conventional independent locking mechanism is changed into an embedded locking mechanism, so that the structure is simplified, and the overall length is effectively shortened. The conventional locking ring 8 is designed at the right end or the left end of the rubber cylinder 12, so that the overall length of the bridge plug 1000 is increased, the locking mechanism is embedded in the open type slip guide groove 7 in the design, the length does not need to be additionally increased, the overall volume of the bridge plug 1000 is shortened, and the time required for dissolution is greatly shortened.
The hollow guide shoe comprises a hollow guide shoe 1, a setting pin 2, a slip hoop I3, a split slip assembly 4, slip teeth 5, a slip hoop II 6, an open slip guide groove 7, a locking ring 8, an anti-rotation screw 12, a central tube 10, a protective bowl 11, a rubber cylinder 12, a phi 65 soluble ball 13 and a pumping ring 14 which are all soluble metals, and a pull rod assembly 15 and a push cylinder 16 are made of alloy steel materials.
As shown in fig. 2, fig. 10-fig. 12, the method for using the fully soluble bridge plug of the present invention comprises the following steps:
And 2, pumping liquid into the sleeve 20, conveying the bridge plug 1000 to a preset position, applying an acting force to the central tube 10 through the push cylinder 16, opening the split slip assembly 4 along the inclined plane under the extrusion action, engaging the outer circumferential surface of the split slip assembly 4 with the inner wall of the sleeve, enabling the external thread of the central tube 10 to enter the internal thread of the locking ring 8 (on the central tube 10, the direction of the external thread is right, on the locking ring 8, the direction of the internal thread is left, after the central tube 10 is extruded into the locking ring 8, the central tube 10 cannot exit the locking ring 8 due to the mutual engagement of the threads), forming self-locking, and compressing and expanding the rubber cylinder 12 to be attached to the inner wall of the.
And 3, after setting, shearing the setting pin 2, and extracting the pull rod assembly 15 from the interior of the bridge plug 1000.
And 4, throwing the phi 65 soluble ball 13, pumping liquid, and conveying the phi 65 soluble ball 13 to the ball seat position on the upper end surface of the bridge plug central pipe to realize sealing and seal the upper and lower sections of the shaft.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A fully soluble bridge plug comprises a hollowed-out guide shoe, a split slip assembly, an open slip guide groove, a protective bowl, a rubber tube, a central body and a pull rod assembly, and is characterized in that the hollowed-out guide shoe, the split slip assembly, the open slip guide groove and the central tube are all arranged on the pull rod assembly, the protective bowl and the rubber tube are arranged between the hollowed-out slip guide groove and an expanded part at the right end of the central tube, the rubber tube is arranged between the two protective bowls, the protective bowl and the rubber tube are arranged on a column section of the central tube through respective central holes, the hollowed-out guide shoe is connected with an inner thread of a pumping slip through the thread, a joint of the outer circumferential surface of the pumping slip and one side end surface is subjected to chamfering treatment, the split slip assembly is matched between the slip guide groove and the hollowed-out slip, and when the open slip guide groove is axially extruded towards the hollowed-out guide shoe under stress, the hollowed-out guide shoe and the split slip assembly are matched through an inclined wedge of the open slip guide groove and the split slip The wedge cooperation of formula slips assembly, open slips guide way and fretwork formula guide shoe can drive the split type slips assembly and radially outwards remove and realize the seat card to the resultant force of split type slips assembly.
2. The fully soluble bridge plug of claim 1, wherein the tie rod assembly is of a stepped shaft type structure and is divided into 5 parts, the axial length of the first part is greater than that of the second part, the axial length of the second part is greater than that of the fifth part, the axial length of the fifth part is greater than that of the third part, the axial length of the third part is greater than that of the fourth part, the fourth part is conical, the fifth part is hollow, the hollow part of the fifth part is a threaded hole, and pin holes are further formed in the outer circumferential surfaces of the fifth part and the first part.
3. The fully soluble bridge plug according to claim 1, wherein the hollowed-out guide shoe is hollow cylindrical as a whole, one end surface of a hollowed-out guide shoe base body is milled to form a hollow circular truncated cone and a front end surface around the hollow circular truncated cone, radial inclined grooves are uniformly distributed on the front end surface, the radial inclined grooves are formed outwards from a position close to the hollow circular truncated cone to a position connected with an outer circumferential surface, the depth of the radial inclined grooves is gradually increased, the front end surface and the outer circumferential surface of the hollowed-out guide shoe base body are rounded, the included angle between the radial inclined grooves and the front end surface is 7 degrees, a hollowed-out through hole is formed in each radial inclined groove, the hollowed-out through hole is communicated with a rear end surface, pin holes communicated with a central hole are formed in the outer circumferential surface, the number of the pin holes is the same as that of the hollowed-out through holes, and the central axis of each pin hole, the outer circumferential surface of the rear side of the pin hole is further provided with an external thread, a tool withdrawal groove is further formed in the joint of the external thread and the pin hole, the joint position of the outer circumferential surface and the rear end face is subjected to chamfering treatment, the angle of the chamfering is 45 degrees, a radial flat groove is milled on the rear end face, the radial flat groove is formed from a central hole to the external thread face, the hollowed-out guide shoe is connected with the end part of the pull rod assembly in a matched mode through the central hole, and the setting pin is connected with the first step part of the pin hole of the pull rod assembly through the pin hole of the hollowed-out guide shoe, so that the hollowed-out guide shoe is installed and fixed at the end part of the pull.
4. The fully soluble bridge plug according to claim 3, wherein the number of the pin holes and the hollowed through holes is 6, and 4 radial flat grooves are milled on the rear end face of the hollowed guide shoe.
5. The fully soluble bridge plug according to claim 1, wherein the open slip guide groove is formed by machining inclined conical surfaces which are the same as the number of the split slip assemblies and matched with the inner conical surface of the slip assemblies in terms of resolution on the outer conical surface by taking the central hole as a circle, the joint of the outer conical surface and the right end surface is subjected to fillet treatment, the middle part of the right end surface is provided with a hollow hexagonal frustum formed by milling, the inner circumferential surface of the open slip guide groove is provided with internal threads, the outer conical surface is provided with screw holes communicated with the internal threads, the open slip guide groove is arranged on the second part of the pull rod assembly through a locking ring and a central tube, the locking ring is connected inside the open slip guide groove through external threads, the internal threads are arranged inside the locking ring and connected with the central tube through the internal threads, and an anti-rotation screw penetrates through the screw holes on the open slip guide groove to enter a C-shaped, the locking ring is prevented from rotating in the central tube.
6. The fully soluble bridge plug according to claim 1, wherein the left end face of the split type slip assembly is connected with a radial inclined groove wedge of the hollowed-out guide shoe in a matched mode, the inner conical surface and the right end face of the other end of the split type slip assembly are connected with an inclined conical surface wedge of the open type slip guide groove in a matched mode, grooves with equal intervals are further formed in the outer end face of the split type slip assembly from left to right, and a slip hoop I, a slip tooth and a slip hoop II are installed in each groove respectively.
7. The fully soluble bridge plug according to claim 1, wherein the hollowed-out guide shoe, the setting pin, the slip hoop I, the split slip assembly, the slip teeth, the slip hoop II, the open slip guide groove, the locking ring, the anti-rotation screw, the central tube, the protective bowl, the rubber barrel and the pumping ring are all soluble metals, and the pull rod assembly and the push barrel are made of alloy steel materials.
8. The fully soluble bridge plug according to claim 1, operating by:
step 1, selecting a pumping ring with a proper size and specification, installing the pumping ring on the external thread of the hollowed guide shoe, connecting the fully soluble bridge plug with a setting tool, and sending the ring into the underground;
pumping liquid into the sleeve, conveying the bridge plug to a preset position, applying acting force to the central pipe by a special setting tool through a push cylinder, opening the split slip assembly along the inclined plane under the extrusion action, engaging the outer circumferential surface of the split slip assembly with the inner wall of the sleeve, allowing the outer thread of the central pipe to enter the inner thread of the locking ring to form self locking, and allowing the rubber cylinder to be compressed and expanded to be attached to the inner wall of the sleeve;
step 3, after setting, cutting off the setting pin, and drawing out the pull rod assembly from the bridge plug;
and 4, throwing the phi 65 soluble ball, pumping liquid, and conveying the phi 65 soluble ball to the ball seat position on the upper end surface of the bridge plug central pipe to realize sealing and seal the upper and lower sections of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553271.1A CN112647891B (en) | 2020-12-24 | 2020-12-24 | Full-soluble bridge plug |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553271.1A CN112647891B (en) | 2020-12-24 | 2020-12-24 | Full-soluble bridge plug |
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| CN112647891A true CN112647891A (en) | 2021-04-13 |
| CN112647891B CN112647891B (en) | 2022-09-16 |
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| CN202011553271.1A Active CN112647891B (en) | 2020-12-24 | 2020-12-24 | Full-soluble bridge plug |
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Cited By (1)
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|---|---|---|---|---|
| CN113279722A (en) * | 2021-06-09 | 2021-08-20 | 门万龙 | Packer for oil exploitation |
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|---|---|
| CN112647891B (en) | 2022-09-16 |
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Effective date of registration: 20220126 Address after: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: Sinopec Jingwei Co.,Ltd. Applicant after: Southwest measurement and control company of Sinopec Jingwei Co.,Ltd. Address before: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: LOGGING BRANCH, SINOPEC SOUTHWEST PETROLEUM ENGINEERING CO.,LTD. |
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