CN114458252A - Expansion tool capable of being butted and operation method thereof - Google Patents
Expansion tool capable of being butted and operation method thereof Download PDFInfo
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- CN114458252A CN114458252A CN202111131800.3A CN202111131800A CN114458252A CN 114458252 A CN114458252 A CN 114458252A CN 202111131800 A CN202111131800 A CN 202111131800A CN 114458252 A CN114458252 A CN 114458252A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003780 insertion Methods 0.000 claims abstract description 38
- 230000037431 insertion Effects 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims description 55
- 230000008569 process Effects 0.000 claims description 16
- 210000001503 joint Anatomy 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 9
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/106—Couplings or joints therefor
Abstract
The invention provides an expansion tool capable of being butted and an operation method thereof.A tail end outer wall of an oil pipe or a drill rod string is in threaded connection with a head end inner wall of a central pipe, a reducing section is formed on the upper outer wall of the central pipe, an expanding section is formed below the reducing section, an anchor block is arranged in the expanding section, an anchor sleeve is arranged on the central pipe below the anchor block, the tail end outer wall of the anchor sleeve is in threaded connection with the head end inner wall of an outer cylinder, a spring cavity is formed between the outer wall of the central pipe and the inner wall of the outer cylinder, a spring is arranged in the spring cavity, and the tail end inner wall of the central pipe is in threaded connection with the head end outer wall of an insertion pipe. The inserting part is arranged below the inserting pipe, the inserted part is arranged above the expansion cone, the inserting part adopts an anchor block structure with a spring, after the inserting part is inserted, the anchor block can be locked, can bear large pulling force, is not easy to disengage, is stable and reliable, and can be unlocked and separated by simple operation after construction.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an expansion tool capable of being butted and an operation method thereof.
Background
The expandable pipe technology is characterized in that an expansion pipe to be expanded is put into a well, hydraulic pressure is used as power, the expansion pipe is extruded by an expansion cone, so that the expansion pipe is radially expanded, the expansion pipe is close to a casing, the functions of expansion positioning and sealing can be realized, the core tool of the technology is an expansion tool, the expansion tool is divided into two layers of pipe columns before expansion, the outer layer is the expansion pipe, and the inner layer is an insertion pipe column, such as an oil pipe or a drill pipe. When more than one expansion pipe is used, the expansion tool has two methods in the process of going down the well, one method is that an expansion pipe and an oil pipe are used as a module and are integrally put in, and the method is similar to a method of building blocks; the other method is to put all the expansion pipes and the expansion cones into the well head and then insert the insert pipe column into the sealing cylinder in the expansion pipe. The second method is more time-saving in operation, but a special insertion tool needs to be connected below the insertion string, so that the insertion string and the expansion cone are integrated after insertion, and the expansion cone can bear larger pulling force. At present, a plurality of special insertion tools are used, split rings are arranged on the outer sides of grooves below insertion pipe columns, insertion and locking are achieved by changing the outer diameters of the split rings, however, due to the strength problem of the split rings, the special insertion tools have hidden dangers, the split rings cannot be guaranteed to be stressed for a circle when being subjected to shearing force, only one section of each split ring is subjected to the shearing force, the maximum tensile force borne by the special insertion tool is different every time, the risk of disengagement exists, and the special insertion tools are not reliable enough.
Disclosure of Invention
The invention overcomes the defects in the prior art, the split rings of the existing special insertion tool can not ensure that a circle is stressed when being subjected to shearing force, each split ring only has one section subjected to the shearing force, so the maximum tensile force borne by each split ring is different every time, the risk of disengagement exists, and the expansion tool is not reliable enough. After the construction is finished, the insertion part and the inserted part can be separated by unlocking through simple operation.
The purpose of the invention is realized by the following technical scheme.
An expansion tool capable of being docked, comprising an inner tubular string and an expansion tubular portion, the inner tubular string being disposed within the expansion tubular portion;
the inner tubular column comprises an anchor block, an anchor sleeve, an outer cylinder, a central tube and an insert tube, the outer wall of the tail end of the oil tube or the drill rod string is in threaded connection with the inner wall of the head end of the central tube, a reducing section is formed on the outer wall of the upper part of the central tube, an expanding section is formed below the reducing section, the anchor block is arranged in the diameter expanding section, the anchor sleeve is arranged on the central pipe below the anchor block, the outer wall of the tail end of the anchor sleeve is in threaded connection with the inner wall of the head end of the outer barrel, a spring cavity is formed between the outer wall of the central tube and the inner wall of the outer barrel, a spring is arranged in the spring cavity, an upper spring limiting boss is formed on the outer wall of the central tube positioned at the head end of the spring, a lower spring limiting boss is formed on the inner wall of the outer tube positioned at the tail end of the spring, the spring is used for limiting the position of the spring, and the inner wall of the tail end of the central tube is in threaded connection with the outer wall of the head end of the insertion tube;
the expansion pipe comprises an inserted cylinder, a connecting sleeve, an expansion cone, an expansion pipe and a drillable plug, the inserted cylinder is arranged in the expansion pipe and is in clearance fit with the expansion pipe, the tail end inner wall of the inserted cylinder is in threaded connection with the head end outer wall of the connecting sleeve, the tail end outer wall of the connecting sleeve is sleeved with the expansion cone, the tail end inner wall of the expansion cone is in threaded connection with the tail end outer wall of the connecting sleeve, the tail end inner wall of the expansion pipe is in threaded connection with the outer wall of the drillable plug, a ball seat channel penetrating through the drillable plug is arranged on the drillable plug, the ball seat channel sequentially comprises an inclined plane ball seat, a ball seat through diameter and a ball seat expanding diameter from top to bottom, and a copper ball is placed on the inclined plane ball seat.
The anchor block adopts the structure that the inner wall is arc-shaped and provided with arc-shaped bulges, the arc-shaped inner wall of the anchor block is utilized to realize the purpose of assembling the anchor block in a rectangular opening of the anchor sleeve, the arc-shaped bulges on the outer wall of the anchor block are utilized to realize the purpose of matching the anchor block with an external boss of the central tube, 30-degree chamfers are formed at the edges of the inner wall of the anchor block, thin steps are formed in the circumferential direction of the anchor block, and the outer sides of the thin steps are arc-shaped so as to realize the purpose of tightly adhering to the inner diameter of the anchor sleeve.
When the anchor block is positioned on the diameter expanding section of the central tube, the outer diameter of the anchor block is larger than the minimum inner diameter of the inserted cylinder, and when the anchor block is positioned on the diameter reducing section of the central tube, the outer diameter of the anchor block is smaller than the minimum inner diameter of the inserted cylinder.
An anchor sleeve expanding section is formed in the middle of the outer wall of the anchor sleeve and achieves transition through an angle of 45 degrees, 4 rectangular notches are formed in the anchor sleeve expanding section, the anchor block is installed at the rectangular notch of the anchor sleeve expanding section, the arc-shaped inner wall of the anchor block is assembled in the rectangular notch of the anchor sleeve, and an anchor sleeve triangular male thread is formed on the outer wall of the tail end of the anchor sleeve.
The side wall of the outer barrel is provided with 4 air outlets penetrating through the outer barrel, and the air outlets are located at the spring cavity.
And 3 dovetail grooves are formed on the outer wall of the upper part of the central pipe above the reducing section, and first O-shaped rings are arranged in the dovetail grooves.
The upper portion of the inserting pipe is provided with an inserting pipe diameter expanding section for positioning an inclined plane on the inner side above the connecting sleeve, the middle portion and the lower portion of the inserting pipe are provided with an inserting pipe diameter reducing section, and the inserting pipe diameter expanding section is connected with the inserting pipe diameter reducing section through a large-inclination chamfer.
The expansion pipe is characterized in that a dustproof ring is arranged between the head end of the expansion pipe and the outer wall of the oil pipe or the drill string, and the dustproof ring is made of plastic.
The inner wall of the head end of the inserted cylinder forms a 30-degree chamfer angle to facilitate the insertion of the insertion pipe, the inner wall of the inserted cylinder below the 30-degree chamfer angle forms an upper sealing surface for matching and sealing with the first O-shaped ring, an inserted cylinder reducing section is formed below the upper sealing surface, an inserted cylinder expanding section is formed below the inserted cylinder reducing section, and a lower sealing surface is formed on the inner wall of the inserted cylinder below the inserted cylinder expanding section.
The head end inner wall of adapter sleeve forms the oblique chamfer of a 45 degrees to the entering of insert tube, just the oblique chamfer of 45 degrees can be laminated in order to realize the location with the insert tube diameter expanding section laminating of insert tube, thereby guarantees that the anchor block can accurately enter into by insert section of thick bamboo diameter expanding section department, realizes the locking form upper seal groove and lower seal groove on the outer wall at adapter sleeve head and the tail both ends respectively, be provided with second O type circle in the upper seal groove, second O type circle realize with the sealed of being inserted a section of thick bamboo, be provided with third O type circle in the seal groove down, the sealed of adapter sleeve and expansion cone is realized to third O type circle, the upper portion inner wall of adapter sleeve is the interior diameter expanding section of adapter sleeve for be clearance fit with the surface of insert tube.
The outer wall of expansion awl adopts the little big structure of tail end external diameter of head end external diameter, and the outer wall head end of expansion awl passes through inclined plane and the smooth transition of fillet with the outer wall tail end of expansion awl the lower part outer wall of expansion awl forms an expansion awl seal groove be provided with fourth O type circle in the expansion awl seal groove, fourth O type circle and the interior sealed face cooperation realization of expansion pipe are sealed, the upper portion inner wall of expansion awl forms an expansion awl internal seal face, realizes sealedly with the cooperation of third O type circle.
The inner wall of the tail end of the expansion pipe forms an inner expanding section of the expansion pipe, the inner expanding section of the expansion pipe forms a launching cavity, an expansion pipe chamfer is formed on the inner wall of the tail end of the expansion pipe below the launching cavity, the expansion pipe chamfer plays a role of guiding shoes in the process of going down a well, and sealing modules are uniformly arranged on the outer wall of the expansion pipe from top to bottom and used for sealing and positioning the sleeve.
The drillable plug is made of cast iron so as to be conveniently drilled, 2 drillable plug sealing grooves are formed in the outer wall of the middle of the drillable plug, and a fifth O-shaped ring is arranged in each drillable plug sealing groove so as to realize sealing with the expansion pipe.
A working method of a butt-joint expansion tool comprises the following steps;
step 1, a downhole process
Firstly, the assembled expansion pipe part is put into a well, and is suspended at a well head through a safety slip, and then an inner-layer pipe column is connected through an oil pipe or a drill rod and is put into the expansion pipe part;
step 2, butt joint process
When the inner pipe column enters the expansion pipe, when the central pipe and the anchor block pass through the upper sealing surface of the inserted cylinder and pass through the reducing section of the inserted cylinder, the outer diameter of the anchor block is larger than the inner diameter of the reducing section of the inserted cylinder, the anchor block cannot pass through the reducing section of the inserted cylinder and stops moving, the central pipe compresses the spring, the central pipe continuously moves downwards relative to the anchor block, when the reducing section of the central pipe is aligned with the anchor block, the anchor block enters the reducing section of the central pipe, the outer diameter of the anchor block is reduced, when the outer diameter of the anchor block is smaller than the inner diameter of the reducing section of the inserted cylinder, the anchor block and the central pipe pass through the reducing section of the inserted cylinder, when the anchor block enters the expanding section of the inserted cylinder through the reducing section of the inserted cylinder, the restoring force of the spring acts on the limiting boss of the upper spring of the central pipe, so that the outer cylinder, the anchor sleeve and the anchor block move upwards along the central pipe, and finally return to the position before butt joint, the anchor block is positioned on the diameter expanding section of the central tube, a 45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve, so that the insertion tube can enter conveniently, the 45-degree oblique chamfer can be attached to the diameter expanding section of the insertion tube to realize positioning, the anchor block can accurately enter the diameter expanding section of the inserted tube to realize locking, and meanwhile, the first O-shaped ring is matched with the upper sealing surface of the inserted tube to realize sealing;
step 2, butt joint process
When the inner pipe column enters the expansion pipe, when the central pipe and the anchor block pass through the upper sealing surface of the inserted cylinder and pass through the reducing section of the inserted cylinder, the outer diameter of the anchor block is larger than the inner diameter of the reducing section of the inserted cylinder, the anchor block cannot pass through the reducing section of the inserted cylinder and stops moving, the central pipe compresses the spring, the central pipe continuously moves downwards relative to the anchor block, when the reducing section of the central pipe is aligned with the anchor block, the anchor block enters the reducing section of the central pipe, the outer diameter of the anchor block is reduced, when the outer diameter of the anchor block is smaller than the inner diameter of the reducing section of the inserted cylinder, the anchor block and the central pipe pass through the reducing section of the inserted cylinder, when the anchor block enters the expanding section of the inserted cylinder through the reducing section of the inserted cylinder, the restoring force of the spring acts on the limiting boss of the upper spring of the central pipe, so that the outer cylinder, the anchor sleeve and the anchor block move upwards along the central pipe, and finally return to the position before butt joint, the anchor block is positioned on the diameter expanding section of the central tube, a 45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve, so that the insertion tube can enter conveniently, the oblique chamfer can be attached to the diameter expanding section of the insertion tube to realize positioning, the anchor block can accurately enter the diameter expanding section of the inserted tube to realize locking, and meanwhile, the first O-shaped ring is matched with the upper sealing surface of the inserted tube to realize sealing;
step 3, lowering and expanding
After the butt joint is completed, lifting an oil pipe or a drill rod string above an inner-layer pipe string to lift the expansion pipe part together, putting the inner-layer pipe string and the expansion pipe part into the well at a preset depth, then pumping hydraulic pressure into the oil pipe or the drill rod string, pushing an expansion cone to move upwards by hydraulic pressure, continuing to expand a necking part in the middle of the expansion pipe, namely an unexpanded expansion pipe, wherein a sealing module outside the expansion pipe is attached to the inner wall of a casing pipe in the expansion process to realize the sealing and positioning of the casing pipe, when the middle necking part of the expansion pipe is completely expanded, the expansion cone breaks a dustproof ring and is lifted out of the expansion pipe, the hydraulic pressure in the oil pipe or the drill rod string is reduced to 0, the hydraulic pressure reduction is also a signal of the completion of the expansion, and finally, except for a copper ball, the expansion pipe, a fifth O-shaped ring and a drillable plug, the other parts are all lifted out of the well head;
After the parts are lifted to a wellhead, firstly, an expansion cone and a connecting sleeve are disassembled, then, an inserting pipe is disassembled, after the inserting pipe is disassembled, the tail end of an outer cylinder loses the positioning of the inserting pipe, the outer cylinder drives an anchor sleeve and an anchor block to move downwards together under the action of a spring, at the moment, the central pipe is lifted upwards, the anchor block moves from an expanding section outside the central pipe to a reducing section, the equivalent outer diameter of the anchor block is reduced, and when the equivalent outer diameter of the anchor block is smaller than the minimum through diameter of the inserted pipe, the central pipe is lifted from the inserted pipe together, so that the unlocking of the anchor block is realized;
step 5, drilling off the drillable plug
And (4) putting the drilling tool into the well, and drilling the drillable plug and the copper ball together to realize the communication of the shaft.
The invention has the beneficial effects that: the running process is not limited by the number of the expansion pipes, the running of a plurality of expansion pipes can be realized by one time of pipe column, and the running time can be saved; the invention replaces the conventional snap spring structure with the combination of the spring and the anchor block, and the butt joint part can bear larger tension and pressure and has high reliability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the inner tubular string of the present invention;
FIG. 3 is a schematic view of the construction of an outer tubing string according to the present invention;
FIG. 4 is a schematic structural view of an anchor block of the present invention, wherein (a) is a schematic overall structural view, and (b) is a schematic sectional structural view taken along A-A in FIG. a;
FIG. 5 is a schematic structural view of the anchor sleeve of the present invention, wherein (a) is a schematic overall structural view and (b) is a schematic sectional structural view taken along A-A in FIG. a;
fig. 6 is a schematic view of the structure of the ground portion according to the present invention.
In the figure: 1 is a dustproof ring, 2 is an oil pipe or a drill rod string, 3 is a first O-shaped ring, 4 is an anchor block, 5 is an anchor sleeve, 6 is an outer cylinder, 7 is a central pipe, 8 is a spring, 9 is an insertion pipe, 10 is an inserted cylinder, 11 is a second O-shaped ring, 12 is a connecting sleeve, 13 is an expansion cone, 14 is a third O-shaped ring, 15 is a fourth O-shaped ring, 16 is a copper ball, 17 is an expansion pipe, 18 is a fifth O-shaped ring, and 19 is a drillable plug;
for a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
An expansion tool capable of being docked, comprising an inner tubular string and an expansion tubular section, the inner tubular string being disposed within the expansion tubular section;
the inner layer pipe column comprises an anchor block 4, an anchor sleeve 5, an outer cylinder 6, a central pipe 7 and an inserting pipe 9, the outer wall of the tail end of the oil pipe or the drill rod string 2 is in threaded connection with the inner wall of the head end of the central pipe 7, a reducing section is formed on the outer wall of the upper part of the central tube 7, an expanding section is formed below the reducing section, the anchor block 4 is arranged in the expanding section, the anchor sleeve 5 is arranged on the central tube 7 below the anchor block 4, the outer wall of the tail end of the anchor sleeve 5 is in threaded connection with the inner wall of the head end of the outer tube 6, a spring cavity is formed between the outer wall of the central tube 7 and the inner wall of the outer cylinder 6, a spring 8 is arranged in the spring cavity, an upper spring limiting boss is formed on the outer wall of the central tube 7 positioned at the head end of the spring 8, a lower spring limiting boss is formed on the inner wall of the outer tube 6 positioned at the tail end of the spring 8, the spring 8 is limited in position, and the inner wall of the tail end of the central tube 7 is in threaded connection with the outer wall of the head end of the insertion tube 9;
the expansion pipe part comprises an inserted cylinder 10, a connecting sleeve 12, an expansion cone 13, an expansion pipe 17 and a drillable plug 19, the inserted cylinder 10 is arranged in the expansion pipe 17 and is in clearance fit with the expansion pipe 17, the tail end inner wall of the inserted cylinder 10 is in threaded connection with the head end outer wall of the connecting sleeve 12, the tail end outer wall of the connecting sleeve 12 is sleeved with the expansion cone 13, the tail end inner wall of the expansion cone 13 is in threaded connection with the tail end outer wall of the connecting sleeve 12, the tail end inner wall of the expansion pipe 17 is in threaded connection with the outer wall of the drillable plug 19, a ball seat channel penetrating through the drillable plug is arranged on the drillable plug 19, the ball seat channel sequentially comprises an inclined ball seat, a ball seat through diameter and a ball seat expanding diameter from top to bottom, and a copper ball 16 is placed on the inclined ball seat.
Example two
On the basis of the first embodiment, the inner wall of the anchor block 4 is of a structure with arc-shaped bulges, the arc-shaped inner wall of the anchor block 4 is used for assembling the anchor block in the rectangular opening of the anchor sleeve 5, the arc-shaped bulges on the outer wall of the anchor block 4 are used for matching with the external boss of the central tube 7, 30-degree chamfers are formed at the edges of the inner wall of the anchor block 4, thin steps are formed in the circumferential direction of the anchor block 4, and the outer sides of the thin steps are arc-shaped so as to achieve the purpose of being tightly attached to the inner diameter of the anchor sleeve 5.
When anchor block 4 is located in the expanded diameter section of the central tube 7, the outer diameter of anchor block 4 is larger than the smallest inner diameter of the inserted cylinder 10, and when anchor block 4 is located in the reduced diameter section of the central tube 7, the outer diameter of anchor block 4 is smaller than the smallest inner diameter of the inserted cylinder 10.
An anchor sleeve expanding section is formed in the middle of the outer wall of the anchor sleeve 5 and achieves transition through an angle of 45 degrees, 4 rectangular notches are formed in the anchor sleeve expanding section, the anchor block 4 is installed at the rectangular notch of the anchor sleeve expanding section, the arc-shaped inner wall of the anchor block 4 is assembled in the rectangular notch of the anchor sleeve 5, and an anchor sleeve triangular male thread is formed on the outer wall of the tail end of the anchor sleeve 5.
The side wall of the outer barrel 6 is provided with 4 air outlets which penetrate through the outer barrel 6, and the air outlets are positioned at the spring cavity.
And 3 dovetail grooves are formed on the outer wall of the upper part of the central tube 7 above the reducing section, and a first O-shaped ring 3 is arranged in each dovetail groove.
An inserting pipe diameter expanding section is formed at the upper part of the inserting pipe 9 and used for positioning an inclined plane at the upper inner side of the connecting sleeve 12, an inserting pipe diameter reducing section is formed at the middle part and the lower part of the inserting pipe 9, and the inserting pipe diameter expanding section is connected with the inserting pipe diameter reducing section through a large-inclination chamfer.
EXAMPLE III
On the basis of the second embodiment, a dustproof ring 1 is arranged between the head end of the expansion pipe 17 and the outer wall of the oil pipe or the drill string 2, and the dustproof ring 1 is made of plastic materials.
The inner wall of the head end of the inserted cylinder 10 forms a 30-degree chamfer angle to facilitate the insertion of the insertion pipe 9, the inner wall of the inserted cylinder 10 below the 30-degree chamfer angle forms an upper sealing surface for matching and sealing with the first O-shaped ring 3, a diameter-reduced section of the inserted cylinder is formed below the upper sealing surface, an diameter-expanded section of the inserted cylinder is formed below the diameter-reduced section of the inserted cylinder, and a lower sealing surface is formed on the inner wall of the inserted cylinder below the diameter-expanded section of the inserted cylinder.
A45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve 12 to facilitate the insertion of the insertion pipe 9, the 45-degree oblique chamfer can be attached to the diameter expanding section of the insertion pipe 9 to achieve positioning, so that the anchor block 4 can accurately enter the diameter expanding section of the inserted cylinder to achieve locking, an upper sealing groove and a lower sealing groove are formed on the outer walls of the head end and the tail end of the connecting sleeve 12 respectively, a second O-shaped ring 11 is arranged in the upper sealing groove, the second O-shaped ring 11 achieves sealing with the inserted cylinder 10, a third O-shaped ring 14 is arranged in the lower sealing groove, the third O-shaped ring 14 achieves sealing of the connecting sleeve 12 and an expansion cone 13, and the inner wall of the upper portion of the connecting sleeve 12 is the inner diameter expanding section of the connecting sleeve and is used for clearance fit with the outer surface of the insertion pipe 9.
The outer wall of expansion cone 13 adopts the little tail end external diameter of head end external diameter structure big, and the outer wall head end of expansion cone 13 and the outer wall tail end of expansion cone 13 pass through inclined plane and fillet smooth transition, forms an expansion cone seal groove at the lower part outer wall of expansion cone 13, is provided with fourth O type circle 15 in the expansion cone seal groove, and fourth O type circle 15 realizes sealedly with the sealed face cooperation in the expansion pipe 17, and the upper portion inner wall of expansion cone 13 forms an expansion cone internal seal face, realizes sealedly with the cooperation of third O type circle 14.
The inner wall of the tail end of the expansion pipe 17 forms an inner expanding section of the expansion pipe, the inner expanding section of the expansion pipe forms a launching cavity, an expansion pipe chamfer is formed on the inner wall of the tail end of the expansion pipe 17 below the launching cavity, the expansion pipe chamfer plays a role of guiding shoes in the process of going down the well, and sealing modules are uniformly arranged on the outer wall of the expansion pipe 17 from top to bottom and used for sealing and positioning the sleeve.
The drillable plug 19 is made of cast iron so as to be convenient to drill, 2 drillable plug sealing grooves are formed in the outer wall of the middle of the drillable plug 19, and a fifth O-shaped ring 18 is arranged in each drillable plug sealing groove so as to seal the expansion pipe 17.
Example four
A working method of a butt-joint expansion tool comprises the following steps;
step 1, a downhole process
Firstly, the assembled expansion pipe part is put into a well, and is suspended at a well head through a safety slip, and then an inner-layer pipe column is connected through an oil pipe or a drill rod and is put into the expansion pipe part;
step 2, butt joint process
When the inner pipe column enters the expansion pipe part, when the central pipe 7 and the anchor block 4 pass through the upper sealing surface of the inserted cylinder 10 and pass through the reducing section of the inserted cylinder, the outer diameter of the anchor block 4 is larger than the inner diameter of the reducing section of the inserted cylinder, the anchor block 4 cannot pass through and stops moving, the central pipe 7 compresses the spring 8, the central pipe 7 continuously moves downwards relative to the anchor block 4, when the reducing section of the central pipe 7 is aligned with the anchor block 4, the anchor block 4 enters the reducing section of the central pipe 7, the outer diameter of the anchor block 4 is reduced, when the outer diameter of the anchor block 4 is smaller than the inner diameter of the reducing section of the inserted cylinder 10, the anchor block 4 and the central pipe 7 pass through the reducing section of the inserted cylinder 10, when the anchor block 4 passes through the reducing section of the inserted cylinder 10 and enters the expanding section of the inserted cylinder, the restoring force of the spring 8 acts on the upper spring limiting boss of the central pipe 7, so that the outer cylinder 6, the anchor sleeve 5 and the anchor block 4 move upwards along the central pipe 7, the anchor block 4 finally returns to the position before butt joint, namely, the anchor block is positioned on the diameter expansion section of the central tube 7, a 45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve 12, so that the insertion tube 9 can conveniently enter, and the 45-degree oblique chamfer can be attached to the diameter expansion section of the insertion tube 9 to realize positioning, so that the anchor block 4 can accurately enter the diameter expansion section of the inserted cylinder to realize locking, and meanwhile, the first O-shaped ring 3 is matched with the upper sealing surface of the inserted cylinder 10 to realize sealing;
step 3, lowering and expanding
After the butt joint is finished, the oil pipe or the drill pipe string 2 above the inner-layer pipe column is lifted up, the expansion pipe part can be lifted up together, the inner-layer pipe column and the expansion pipe part are lowered into the underground for a preset depth, then hydraulic pressure is applied to the oil pipe or the drill string 2, the expansion cone 13 is pushed by the hydraulic pressure to move upwards, the middle necking part of the expansion pipe 17 is reduced, namely, the unexpanded expansion pipe continues to expand, and in the expansion process, the sealing module at the outer side of the expansion pipe 17 is attached to the inner wall of the casing pipe to realize the sealing and the positioning of the casing pipe, when the middle necking part of the expansion pipe 17 is completely expanded, the expansion cone 13 will break the dust-proof ring 1, and is lifted out of the expansion pipe 17, the hydraulic pressure in the oil pipe or the drill string 2 is reduced to 0, the hydraulic pressure reduction is also a signal of the end of expansion, and finally, except for the copper ball 16, the expansion pipe 17, the fifth O-ring 18 and the drillable plug 19, the components are all lifted out of the well head;
After the parts are lifted to a wellhead, firstly the expansion cone 14 and the connecting sleeve 12 are disassembled, then the inserting tube 9 is disassembled, after the inserting tube 9 is disassembled, the tail end of the outer tube 6 loses the inserting tube 9 to position the inserting tube, under the action of the spring 8, the outer tube 6 carries the anchor sleeve 5 and the anchor block 4 to move downwards together, at the moment, the central tube 7 is lifted upwards, the anchor block 4 moves from the expanding section outside the central tube 7 to the reducing section, the equivalent outer diameter of the anchor block 4 is reduced, and when the equivalent outer diameter of the anchor block 4 is smaller than the minimum diameter of the inserted tube 10, the central tube 7 is lifted out of the inserted tube 10 together, so that the unlocking of the anchor block 4 is realized.
Step 5, drilling off the drillable plug
And (4) putting a drilling tool, and drilling the drillable plug 19 and the copper ball 16 together to realize the communication of the shaft.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. An expansion tool capable of being docked, characterized by: comprising an inner tubular string and an expanded tubular section, the inner tubular string being disposed within the expanded tubular section;
the inner tubular column comprises an anchor block, an anchor sleeve, an outer cylinder, a central tube and an insert tube, the outer wall of the tail end of the oil tube or the drill rod string is in threaded connection with the inner wall of the head end of the central tube, a reducing section is formed on the outer wall of the upper part of the central tube, an expanding section is formed below the reducing section, the anchor block is arranged in the diameter expanding section, the anchor sleeve is arranged on the central pipe below the anchor block, the outer wall of the tail end of the anchor sleeve is in threaded connection with the inner wall of the head end of the outer barrel, a spring cavity is formed between the outer wall of the central tube and the inner wall of the outer barrel, a spring is arranged in the spring cavity, an upper spring limiting boss is formed on the outer wall of the central tube positioned at the head end of the spring, a lower spring limiting boss is formed on the inner wall of the outer tube positioned at the tail end of the spring, the spring is used for limiting the position of the spring, and the inner wall of the tail end of the central tube is in threaded connection with the outer wall of the head end of the insertion tube;
the expansion pipe comprises an inserted cylinder, a connecting sleeve, an expansion cone, an expansion pipe and a drillable plug, the inserted cylinder is arranged in the expansion pipe and is in clearance fit with the expansion pipe, the tail end inner wall of the inserted cylinder is in threaded connection with the head end outer wall of the connecting sleeve, the tail end outer wall of the connecting sleeve is sleeved with the expansion cone, the tail end inner wall of the expansion cone is in threaded connection with the tail end outer wall of the connecting sleeve, the tail end inner wall of the expansion pipe is in threaded connection with the outer wall of the drillable plug, a ball seat channel penetrating through the drillable plug is arranged on the drillable plug, the ball seat channel sequentially comprises an inclined plane ball seat, a ball seat through diameter and a ball seat expanding diameter from top to bottom, and a copper ball is placed on the inclined plane ball seat.
2. A dockable expansion tool as claimed in claim 1, wherein: the anchor block is of a structure that the inner wall is an arc-shaped outer wall and is provided with arc-shaped bulges, the arc-shaped inner wall of the anchor block is used for achieving the purpose of assembling the anchor block in a rectangular opening of an anchor sleeve, the arc-shaped bulges on the outer wall of the anchor block are used for achieving the purpose of matching the anchor block with an external boss of a central tube, 30-degree chamfers are formed at the edges of the inner wall of the anchor block, thin steps are formed in the circumferential direction of the anchor block, and the outer sides of the thin steps are arc-shaped so as to achieve the purpose of tightly attaching to the inner diameter of the anchor sleeve;
when the anchor block is located the hole enlargement section of center tube, the external diameter of anchor block is greater than the minimum internal diameter of being inserted a section of thick bamboo, and when the anchor block was located the reducing section of center tube, the anchor block external diameter was less than the minimum internal diameter of being inserted a section of thick bamboo.
3. A dockable expansion tool as claimed in claim 2, wherein: an anchor sleeve expanding section is formed in the middle of the outer wall of the anchor sleeve and achieves transition through an angle of 45 degrees, 4 rectangular notches are formed in the anchor sleeve expanding section, the anchor block is installed at the rectangular notch of the anchor sleeve expanding section, the arc-shaped inner wall of the anchor block is assembled in the rectangular notch of the anchor sleeve, and an anchor sleeve triangular male thread is formed on the outer wall of the tail end of the anchor sleeve.
4. A dockable expansion tool as claimed in claim 1, wherein: 4 air outlet holes penetrating through the outer cylinder are formed in the side wall of the outer cylinder and are located at the spring cavity; and 3 dovetail grooves are formed on the outer wall of the upper part of the central pipe above the reducing section, and first O-shaped rings are arranged in the dovetail grooves.
5. A dockable expansion tool as claimed in claim 4, wherein: an inserting pipe diameter expanding section is formed at the upper part of the inserting pipe and is used for positioning an inclined plane on the inner side above the connecting sleeve, an inserting pipe diameter reducing section is formed at the middle part and the lower part of the inserting pipe, and the inserting pipe diameter expanding section is connected with the inserting pipe diameter reducing section through a large-inclination chamfer; the expansion pipe is characterized in that a dustproof ring is arranged between the head end of the expansion pipe and the outer wall of the oil pipe or the drill string, and the dustproof ring is made of plastic.
6. A dockable expansion tool as claimed in claim 5, wherein: the inner wall of the head end of the inserted cylinder forms a 30-degree chamfer angle to facilitate the insertion of the insertion pipe, the inner wall of the inserted cylinder below the 30-degree chamfer angle forms an upper sealing surface for matching and sealing with the first O-shaped ring, an inserted cylinder reducing section is formed below the upper sealing surface, an inserted cylinder expanding section is formed below the inserted cylinder reducing section, and a lower sealing surface is formed on the inner wall of the inserted cylinder below the inserted cylinder expanding section.
7. A dockable expansion tool as claimed in claim 5, wherein: the head end inner wall of adapter sleeve forms the oblique chamfer of a 45 degrees to the entering of insert tube, just the oblique chamfer of 45 degrees can be laminated in order to realize the location with the insert tube diameter expanding section laminating of insert tube, thereby guarantees that the anchor block can accurately enter into by insert section of thick bamboo diameter expanding section department, realizes the locking form upper seal groove and lower seal groove on the outer wall at adapter sleeve head and the tail both ends respectively, be provided with second O type circle in the upper seal groove, second O type circle realize with the sealed of being inserted a section of thick bamboo, be provided with third O type circle in the seal groove down, the sealed of adapter sleeve and expansion cone is realized to third O type circle, the upper portion inner wall of adapter sleeve is the interior diameter expanding section of adapter sleeve for be clearance fit with the surface of insert tube.
8. A dockable expansion tool as claimed in claim 7, wherein: the outer wall of expansion awl adopts the little big structure of tail end external diameter of head end external diameter, and the outer wall head end of expansion awl passes through inclined plane and the smooth transition of fillet with the outer wall tail end of expansion awl the lower part outer wall of expansion awl forms an expansion awl seal groove be provided with fourth O type circle in the expansion awl seal groove, fourth O type circle and the interior sealed face cooperation realization of expansion pipe are sealed, the upper portion inner wall of expansion awl forms an expansion awl internal seal face, realizes sealedly with the cooperation of third O type circle.
9. A dockable expansion tool as claimed in claim 1, wherein: the inner wall of the tail end of the expansion pipe forms an inner expanding section of the expansion pipe, the inner expanding section of the expansion pipe forms a launching cavity, an expansion pipe chamfer is formed on the inner wall of the tail end of the expansion pipe below the launching cavity, the expansion pipe chamfer plays a role of guiding shoes in the process of going down a well, and sealing modules are uniformly arranged on the outer wall of the expansion pipe from top to bottom and used for sealing and positioning the sleeve; the drillable plug is made of cast iron so as to be conveniently drilled, 2 drillable plug sealing grooves are formed in the outer wall of the middle of the drillable plug, and a fifth O-shaped ring is arranged in each drillable plug sealing groove so as to realize sealing with the expansion pipe.
10. A method of operating with a dockable expansion tool as claimed in any of claims 1 to 9, wherein: the method comprises the following steps of;
step 1, a downhole process
Firstly, the assembled expansion pipe part is put into a well, and is suspended at a well head through a safety slip, and then an inner-layer pipe column is connected through an oil pipe or a drill rod and is put into the expansion pipe part;
step 2, butt joint process
When the inner pipe column enters the expansion pipe, when the central pipe and the anchor block pass through the upper sealing surface of the inserted cylinder and pass through the reducing section of the inserted cylinder, the outer diameter of the anchor block is larger than the inner diameter of the reducing section of the inserted cylinder, the anchor block cannot pass through the reducing section of the inserted cylinder and stops moving, the central pipe compresses the spring, the central pipe continuously moves downwards relative to the anchor block, when the reducing section of the central pipe is aligned with the anchor block, the anchor block enters the reducing section of the central pipe, the outer diameter of the anchor block is reduced, when the outer diameter of the anchor block is smaller than the inner diameter of the reducing section of the inserted cylinder, the anchor block and the central pipe pass through the reducing section of the inserted cylinder, when the anchor block enters the expanding section of the inserted cylinder through the reducing section of the inserted cylinder, the restoring force of the spring acts on the limiting boss of the upper spring of the central pipe, so that the outer cylinder, the anchor sleeve and the anchor block move upwards along the central pipe, and finally return to the position before butt joint, the anchor block is positioned on the diameter expanding section of the central tube, a 45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve, so that the insertion tube can enter conveniently, the 45-degree oblique chamfer can be attached to the diameter expanding section of the insertion tube to realize positioning, the anchor block can accurately enter the diameter expanding section of the inserted tube to realize locking, and meanwhile, the first O-shaped ring is matched with the upper sealing surface of the inserted tube to realize sealing;
step 2, butt joint process
When the inner pipe column enters the expansion pipe, when the central pipe and the anchor block pass through the upper sealing surface of the inserted cylinder and pass through the reducing section of the inserted cylinder, the outer diameter of the anchor block is larger than the inner diameter of the reducing section of the inserted cylinder, the anchor block cannot pass through the reducing section of the inserted cylinder and stops moving, the central pipe compresses the spring, the central pipe continuously moves downwards relative to the anchor block, when the reducing section of the central pipe is aligned with the anchor block, the anchor block enters the reducing section of the central pipe, the outer diameter of the anchor block is reduced, when the outer diameter of the anchor block is smaller than the inner diameter of the reducing section of the inserted cylinder, the anchor block and the central pipe pass through the reducing section of the inserted cylinder, when the anchor block enters the expanding section of the inserted cylinder through the reducing section of the inserted cylinder, the restoring force of the spring acts on the limiting boss of the upper spring of the central pipe, so that the outer cylinder, the anchor sleeve and the anchor block move upwards along the central pipe, and finally return to the position before butt joint, the anchor block is positioned on the diameter expanding section of the central tube, a 45-degree oblique chamfer is formed on the inner wall of the head end of the connecting sleeve, so that the insertion tube can enter conveniently, the oblique chamfer can be attached to the diameter expanding section of the insertion tube to realize positioning, the anchor block can accurately enter the diameter expanding section of the inserted tube to realize locking, and meanwhile, the first O-shaped ring is matched with the upper sealing surface of the inserted tube to realize sealing;
step 3, lowering and expanding
After the butt joint is completed, lifting an oil pipe or a drill rod string above an inner-layer pipe string to lift the expansion pipe part together, putting the inner-layer pipe string and the expansion pipe part into the well at a preset depth, then pumping hydraulic pressure into the oil pipe or the drill rod string, pushing an expansion cone to move upwards by hydraulic pressure, continuing to expand a necking part in the middle of the expansion pipe, namely an unexpanded expansion pipe, wherein a sealing module outside the expansion pipe is attached to the inner wall of a casing pipe in the expansion process to realize the sealing and positioning of the casing pipe, when the middle necking part of the expansion pipe is completely expanded, the expansion cone breaks a dustproof ring and is lifted out of the expansion pipe, the hydraulic pressure in the oil pipe or the drill rod string is reduced to 0, the hydraulic pressure reduction is also a signal of the completion of the expansion, and finally, except for a copper ball, the expansion pipe, a fifth O-shaped ring and a drillable plug, the other parts are all lifted out of the well head;
step 4, unlocking the anchor block
After the parts are lifted to a wellhead, firstly, an expansion cone and a connecting sleeve are disassembled, then, an inserting pipe is disassembled, after the inserting pipe is disassembled, the tail end of an outer cylinder loses the positioning of the inserting pipe, the outer cylinder drives an anchor sleeve and an anchor block to move downwards together under the action of a spring, at the moment, the central pipe is lifted upwards, the anchor block moves from an expanding section outside the central pipe to a reducing section, the equivalent outer diameter of the anchor block is reduced, and when the equivalent outer diameter of the anchor block is smaller than the minimum through diameter of the inserted pipe, the central pipe is lifted from the inserted pipe together, so that the unlocking of the anchor block is realized;
step 5, drilling off the drillable plug
And (4) putting the drilling tool into the well, and drilling the drillable plug and the copper ball together to realize the communication of the shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131800.3A CN114458252B (en) | 2021-09-26 | 2021-09-26 | Expansion tool capable of being abutted and operation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111131800.3A CN114458252B (en) | 2021-09-26 | 2021-09-26 | Expansion tool capable of being abutted and operation method thereof |
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| CN114458252B CN114458252B (en) | 2023-10-31 |
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| Publication number | Publication date |
|---|---|
| CN114458252B (en) | 2023-10-31 |
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