CN112227992A - Double-suspension double-sealing type high-temperature-resistant expansion hanger - Google Patents
Double-suspension double-sealing type high-temperature-resistant expansion hanger Download PDFInfo
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- CN112227992A CN112227992A CN201910633506.9A CN201910633506A CN112227992A CN 112227992 A CN112227992 A CN 112227992A CN 201910633506 A CN201910633506 A CN 201910633506A CN 112227992 A CN112227992 A CN 112227992A
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- 239000000725 suspension Substances 0.000 title claims abstract description 85
- 238000007789 sealing Methods 0.000 title claims abstract description 77
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- 230000007246 mechanism Effects 0.000 claims abstract description 97
- 239000002184 metal Substances 0.000 claims abstract description 70
- 239000007858 starting material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 9
- 229920001973 fluoroelastomer Polymers 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
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- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a double-suspension double-sealing type high-temperature-resistant expansion hanger which comprises an expansion suspension cylinder, a slip seating and hanging mechanism, a suspension sealing mechanism, an expansion mechanism, a back-off mechanism and a buckle-changing joint, wherein the expansion suspension cylinder is connected with the slip seating and hanging mechanism; the slip sitting and hanging mechanism comprises a central tube, an upper expansion cone and a hydraulic mechanism, the hanging and sealing mechanism comprises a metal slip and a sealing barrel which are fixed on the outer surface of the expansion hanging barrel, the expansion mechanism comprises an expansion mandrel, a lower expansion cone and a fixed short section, the expansion mechanism is arranged in an expansion starter of the expansion hanging barrel in advance, and the back-off mechanism is positioned on the lower portion of the expansion mechanism and consists of a bearing mandrel, a bearing, a spring sleeve, a spring and a back-off connector. The invention can realize double suspension of the metal slip and the sealing cylinder and double sealing of metal and rubber, effectively improve the suspension force of the expansion hanger, obviously improve the sealing capability of the expansion hanger under the high-temperature condition, and is suitable for tail pipe well completion operation under the high-temperature well conditions of a thermal production well, a deep well and an ultra-deep well.
Description
Technical Field
The invention relates to a double-suspension double-sealing type high-temperature-resistant expansion hanger in the field of petroleum drilling and well completion tools.
Background
The liner hanging well cementation process is the most common well completion method in deep wells, sidetracking wells and deepening wells, can save the casing, reduce annular flow resistance and displacement pressure in cementing construction, simplify well body structures, facilitate the running of liner strings and solve the difficult problem of well completion and consolidation of deep wells and complex wells.
At present, liner hangers are classified into slip-type liner hangers and expansion-type liner hangers according to their seating and hanging manners. Generally, the slip-type liner hanger has the problems of unreliable mounting and hanging, small mounting and hanging drift diameter and non-ideal sealing effect; the expansion type liner hanger generally adopts a hydraulic mode to realize expansion seat hanging of the hanger, so that the rubber barrel is extruded between double-layer sleeves to realize sealing, the hanging and seat hanging modes are single, and the risks of rubber high-temperature aging failure and back-off releasing difficulty still exist by depending on single rubber sealing under the high-temperature conditions of deep wells and thermal production wells. For example, chinese patent CN101161982B discloses a hydraulic expansion type liner hanger. The hydraulic expansion type tail pipe hanger comprises a feeding joint, a cement rubber plug, a central pipe, an expansion plug, a clamp spring, a shear pin, a sealing rubber plug, a rubber plug guide pipe, a stop ring, a lower connecting pipe and the like. The upper end of the feeding joint is provided with threads which can be connected with a drilling tool. The outer wall of the lower end of the feeding joint is connected with the left-handed thread of the expansion pipe; the inner wall of the lower end of the feeding joint is in threaded connection with the central pipe. The lower end of the central tube is fixed with a sealing rubber plug through a shear pin. The inner diameter of the sealing rubber plug is 8-20 mm smaller than that of the central pipe. The expansion plug is arranged at the lower end in an annular space between the central pipe and the expansion pipe, the expansion plug is in dynamic sealing fit with the central pipe, and the expansion plug can slide on the central pipe; the clamp spring is annular and is clamped in a groove on the outer wall of the lower end of the central tube; the rubber plug guide pipe is connected to the lower end of the expansion pipe; the lower end of the rubber plug guide pipe is in threaded connection with a lower connecting pipe, the lower end of the lower connecting pipe is provided with threads, and the lower connecting pipe is used for connecting a tail pipe string which needs to be hung underground. The stop ring sits on the inner shoulder of the lower connecting tube. The diameter of the central hole at the upper part of the stop ring is the same as the outer diameter of the lower end of the sealing rubber plug, and the diameter of the central hole at the lower part of the stop ring is smaller than the outer diameter of the lower end of the sealing rubber plug. In order to enable the expansion pipe and the sleeve to be hung more firmly, at least one annular bulge is arranged on the outer side of the expansion pipe, the section of the annular bulge is trapezoidal, and the outer diameter of the annular bulge is the same as the diameter of the end part of the expansion pipe. The outer wall of the expansion pipe is directly sealed with the inner wall of the sleeve; rubber sealing can also be adopted, namely a rubber ring is sleeved on the outer wall of the expansion pipe; or the outer wall of the expansion pipe is sleeved with a metal and rubber combined sealing ring, and the metal and rubber combined sealing is adopted. Compared with the prior art, the hydraulic expansion type liner hanger is mainly characterized in that: the expansion plug is pushed to expand the expansion pipe from bottom to top by the action of hydraulic pressure, and the expansion pipe is in close contact with the inner wall of the sleeve to hang the tail pipe. The structure design has great improvement, but the back-off releasing mechanism is not designed, so that the risks of limited length of a suspension tail pipe and difficult running of a pipe column exist, and meanwhile, the single suspension mode is adopted for operation, and effective seating and hanging are difficult to realize under the condition of insufficient hydraulic pressure or no collision and pressure.
Disclosure of Invention
The invention aims to solve the technical problems of the existing expansion hanger, provides a double-suspension double-sealing type high-temperature-resistant expansion liner hanger, meets the construction requirements of liner cementing of an oil-gas well, is particularly suitable for liner completion operation under special working conditions of a deep well and a thermal production well, and reduces the potential safety hazards of the expansion liner hanger in the aspects of hydraulic setting, rubber sealing and back-off releasing.
The technical scheme for solving the technical problem of the invention is as follows:
a double-suspension double-sealing type high-temperature-resistant expansion hanger comprises an expansion suspension cylinder, a slip seating and hanging mechanism, a suspension sealing mechanism, an expansion mechanism and a back-off mechanism;
the expansion hanging cylinder is an expandable short section, and the top and the bottom of the expansion hanging cylinder are respectively provided with an expansion outlet which is expanded in advance and is in an upper bell mouth shape and an expansion starter in a lower bell mouth shape; the bottom of the expansion suspension cylinder is fixedly connected with the tail pipe through a buckle-changing joint;
the slip sitting and hanging mechanism comprises a central pipe, an upper expansion cone and a hydraulic mechanism, wherein a hydraulic cylinder mechanism is connected with the upper expansion cone, the upper expansion cone is provided with a downward expansion cone surface and is preset at an expansion outlet of the expansion suspension cylinder, the upper expansion cone and the central pipe form axial sliding sealing fit, a liquid inlet hole communicated with the inside of the central pipe is formed in the hydraulic cylinder mechanism, and the hydraulic cylinder mechanism is of a one-stage or multi-stage hydraulic cylinder structure; a limiting structure is arranged on the central tube at the lower stroke stop point of the upper expansion cone, and the limiting structure is in limiting fit with the upper expansion cone which axially moves on the central tube;
the suspension sealing mechanism comprises a metal slip and a sealing cylinder which are fixed on the outer surface of the expansion suspension cylinder, the metal slip is composed of a plurality of slip blocks which are arranged in a circumferential manner, and a circulation channel is preset between every two adjacent slip blocks;
the expansion mechanism comprises an expansion mandrel and a lower expansion cone, the expansion mechanism is preset in an expansion starter of the expansion suspension cylinder, the expansion mandrel and the lower expansion cone are of an integral hollow structure or a combined sleeved hollow structure, and the outer surface of the lower expansion cone is provided with an upward expansion conical surface; the upper part of the expansion mandrel is fixedly connected with the central pipe;
the back-off mechanism is positioned at the lower part of the expansion mechanism and comprises a hollow rubber plug, a bearing mandrel, a bearing, a spring sleeve, a spring, a back-off joint and a buckle-changing joint; the bearing mandrel is provided with an inverted buckle connector, inverted threads are arranged on the inverted buckle connector, and the inverted buckle connector is connected with the variable buckle connector in a matched mode through the inverted threads; the back-off joint and the bearing mandrel form circumferential synchronous rotation and circumferential sliding fit; a spring and a spring sleeve are arranged on a bearing mandrel at the upper part of the inverted joint, the spring is positioned between the bearing mandrel and the spring sleeve, the upper part of the bearing mandrel is fixedly connected with an expansion mandrel, and a bearing is arranged between the spring sleeve on the bearing mandrel and the expansion mandrel; the hollow rubber plug is connected to the bottom of the bearing mandrel through a pin;
the expansion hanging cylinder and the buckle changing joint are sequentially and fixedly connected from top to bottom to form an outer pipe column; the hydraulic cylinder mechanism, the central pipe, the expansion mandrel, the bearing mandrel and the hollow rubber plug are sequentially and fixedly connected from top to bottom to form the inner pipe column.
The above scheme further comprises:
the sealing cylinder is formed by matching and combining one or more of a rubber cylinder, a rubber cylinder-trapezoidal metal ring or a rubber cylinder-sawtooth metal ring.
The rubber cylinder is made of high-temperature-resistant fluororubber, and the outer surface of the expansion suspension cylinder at the rubber cylinder part is provided with a metal bulge in spacing fit with the rubber cylinder.
The trapezoidal metal ring is of a structure with wide outside and narrow inside, the trapezoidal metal ring and the zigzag metal ring are made of soft metal materials, and the outer diameter of the trapezoidal metal ring is slightly smaller than the outer diameter of the rubber cylinder.
Slip teeth are processed on the slip blocks, and adjacent slip blocks are fixed with the fixing ring through connecting ribs; the connecting rib is of an open non-closed loop structure, and the outer diameter of the connecting rib is smaller than that of the slip block; the outer diameter of the fixing ring is slightly smaller than the outer diameter of the slip block.
The adjacent slip blocks are fixed through connecting ribs at the lower part and the middle part, and the upper parts of the slip blocks are fixed by fixing rings.
The back-off mechanism further comprises a rubber plug rod, the hollow rubber plug is fixedly installed at the bottom of the rubber plug rod through a pin, the rubber plug rod is connected with the bearing mandrel, and the hollow rubber plug is arranged in a tail pipe connected with the expansion hanger in advance.
The suspension sealing mechanism further comprises a fixed short section, and the expansion mandrel and the lower expansion cone are fixedly connected with the central pipe above the expansion mandrel through the fixed short section.
The main advantages of the invention are:
(1) the double-suspension double-sealing mode operation of double suspension of the metal slip and the sealing cylinder and double material sealing of metal and rubber is adopted, so that the suspension and sealing performance of the expansion hanger is effectively improved;
(2) the sealing cylinder adopts a sealing mode of combining a high-temperature-resistant fluororubber cylinder, a trapezoidal metal ring and a sawtooth-shaped metal ring, improves the sealing capability under the high-temperature condition, and is suitable for tail pipe well completion operation under the high-temperature well conditions of a thermal production well, a deep well and an ultra-deep well.
(3) By adopting the back-off mechanism with the bearing structure, when the neutral point load is reversed, the back-off thread bears smaller axial load, the back-off operation is convenient, and the success rate of the back-off operation is improved.
(4) By adopting the operation mode that the slips are firstly seated and hung by the upper expansion cone and the lower expansion cone and then the expansion hanging cylinder is seated and hung, the mechanical seating and hanging force can be increased, the hydraulic expansion force is reduced, and the operation risk is reduced.
Drawings
FIG. 1 is a general structural cross-sectional view of an embodiment of a double-suspension double-seal type high-temperature-resistant expansion hanger of the invention;
FIG. 2 is a schematic diagram of a metal slip construction according to one embodiment of the present invention;
FIG. 3 is a schematic structural view of a sealing cylinder segment according to an embodiment of the present invention;
FIG. 4 is a schematic view of a run-in state according to an embodiment of the present invention;
FIG. 5 is a schematic view of a pre-cementing back-off condition in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a well cementation and metal slip setting state according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a sitting and hanging state according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a state of the pipe column after construction according to an embodiment of the present invention.
Wherein: 1. the expansion suspension cylinder comprises an expansion suspension cylinder, 2. a metal slip, 201. a slip block, 202. slip teeth, 203. a connecting rib, 204. a fixing ring, 205. a circulation channel, 3. a sealing cylinder, 301. a rubber cylinder, 302. a trapezoidal metal ring, 303. a sawtooth-shaped metal ring, 4. an upper expansion cone, 5. a lower expansion cone, 6. a hydraulic cylinder mechanism, 7. a central pipe, 8. a fixed short joint, 9. an expansion mandrel, 10. a bearing mandrel, 11. a bearing, 12. a spring sleeve, 13. a spring, 14. an inverted buckle joint, 15. a variable buckle joint, 16. a tail pipe, 17. a rubber plug rod, 18. a hollow rubber plug, 19. a drill rod, 20. a drill rod rubber plug, 21. a technical casing, 22. an expansion starter, 23. an expansion outlet, 24. a slip seating mechanism, 25. a suspension sealing mechanism, 26. an expansion mechanism and 27. an inverted buckle mechanism.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the double-suspension double-sealing type high-temperature-resistant expansion hanger comprises an expansion suspension cylinder 1, a slip seating mechanism 24, a suspension sealing mechanism 25, an expansion mechanism 26 and an inverted buckle mechanism 27. Wherein:
the expansion hanging cylinder 1 is an expandable short section, and the top and the bottom of the expansion hanging cylinder are respectively provided with an expansion outlet 23 which is expanded in advance and is in an upper bell mouth shape and an expansion starter 22 which is in a lower bell mouth shape; the bottom of the expansion suspension cylinder 1 is fixedly connected with a tail pipe 16 through a buckle-changing connector 15.
The slip sitting and hanging mechanism 24 comprises a central tube 7, an upper expansion cone 4 and a hydraulic mechanism 6, the hydraulic cylinder mechanism 6 is connected with the upper expansion cone 4, the upper expansion cone 4 is provided with a downward expansion cone surface and is preset at an expansion outlet 23 of the expansion suspension cylinder 1, the upper expansion cone 4 and the central tube 7 form axial sliding sealing fit, the hydraulic cylinder mechanism 6 is provided with a liquid inlet hole communicated with the central tube, and the hydraulic cylinder mechanism 7 is of a one-stage or multi-stage hydraulic cylinder structure; and a limiting structure is arranged on the central tube 7 at the lower stroke stop point of the upper expansion cone 4, and the limiting structure is in limiting fit with the upper expansion cone 4 which axially moves on the central tube 7.
The suspension sealing mechanism 25 comprises a metal slip 2 and a sealing cylinder 3 which are fixed on the outer surface of the expansion suspension cylinder 1, the metal slip 2 is composed of a plurality of slip blocks 201 which are arranged in a circumferential mode, and a circulation channel 205 is preset between every two adjacent slip blocks 201.
The expansion mechanism 26 comprises an expansion mandrel 9 and a lower expansion cone 5, the expansion mechanism 26 is preset in an expansion starter 22 of the expansion suspension cylinder 1, the expansion mandrel 9 and the lower expansion cone 5 are of an integral hollow structure or a combined sleeved hollow structure, and the outer surface of the lower expansion cone 4 is provided with an upward expansion conical surface; the upper part of the expansion mandrel 9 is fixedly connected with the central tube 7.
The back-off mechanism 27 is positioned at the lower part of the expansion mechanism 26 and comprises a hollow rubber plug 18, a bearing mandrel 10, a bearing 11, a spring sleeve 12, a spring 13, a back-off joint 14 and a buckle-changing joint 15; the bearing mandrel 10 is provided with an inverted joint 14, inverted threads are arranged on the inverted joint 14, and the inverted joint 14 is connected with the variable joint 15 in a matched mode through the inverted threads; the back-off joint 14 and the bearing mandrel 10 form circumferential synchronous rotation and circumferential sliding fit; a spring 13 and a spring sleeve 12 are mounted on a bearing mandrel 10 at the upper part of the inverted joint 14, the spring 13 is positioned between the bearing mandrel 10 and the spring sleeve 12, the upper part of the bearing mandrel 10 is fixedly connected with an expansion mandrel 9, and a bearing 11 is mounted between the spring sleeve 12 on the bearing mandrel 10 and the expansion mandrel 9; the hollow rubber plug 18 is connected to the bottom of the bearing mandrel 10 through a pin.
The expansion hanging cylinder 1 and the buckle changing joint 15 are fixedly connected in sequence from top to bottom to form an outer pipe column; the hydraulic cylinder mechanism 6, the central pipe 7, the expansion mandrel 9, the bearing mandrel 10 and the hollow rubber plug 18 are sequentially and fixedly connected from top to bottom to form an inner pipe column.
Example 2
Referring to fig. 3, the method further includes, on the basis of embodiment 1:
the sealing cylinder 3 is formed by one or a plurality of matching and combining of a rubber cylinder 301, a rubber cylinder 301-trapezoidal metal ring 302 or a rubber cylinder 301-sawtooth metal ring 303. Wherein the rubber tube 301 adopts high temperature resistant fluororubber, and the outer surface of the expansion suspension tube 1 at the rubber tube 301 part is provided with a metal bulge in spacing fit with the rubber tube 301. The trapezoid metal ring 302 is of a structure with a wide outer part and a narrow inner part, the trapezoid metal ring 302 and the sawtooth metal ring 303 are made of soft metal materials, and the outer diameter of the trapezoid metal ring 302 and the sawtooth metal ring 303 is slightly smaller than the outer diameter of the rubber cylinder 301.
Referring to fig. 2, slip segments 202 are processed on the slip segments 201, and adjacent slip segments 201 are fixed by connecting ribs 203 and fixing rings 204; the connecting rib 203 is of an open non-closed loop structure, and the outer diameter of the connecting rib 203 is smaller than that of the slip block 201; the outer diameter of the retaining ring 204 is slightly smaller than the outer diameter of the slip segments 201. The adjacent slip blocks 201 are fixed through connecting ribs 203 at the lower part and the middle part, and the upper parts of the slip blocks 201 are fixed through fixing rings 204.
Furthermore, the reversing mechanism 27 further comprises a rubber plug rod 17, the hollow rubber plug 18 is fixedly arranged at the bottom of the rubber plug rod 17 through a pin, the rubber plug rod 17 is connected with the bearing mandrel 10, and the hollow rubber plug 18 is pre-arranged in a tail pipe 16 connected with the expansion hanger. The suspension sealing mechanism 25 further comprises a fixed short section 8, and the expansion mandrel 9 and the lower expansion cone 5 are fixedly connected with the central tube 7 above through the fixed short section 8.
Referring to fig. 1 to 3, the double-suspension double-sealing type high-temperature-resistant expansion hanger comprises an expansion suspension cylinder 1, a slip seating and hanging mechanism 24, a suspension sealing mechanism 25, an expansion mechanism 26, an inverse buckling mechanism 27, a buckle changing connector 15 and a tail pipe 16.
The expansion hanging cylinder 1 is a section of expandable casing short section, the top and the bottom of the expansion hanging cylinder are respectively provided with an expansion outlet 23 which is expanded in advance and is in an upper bell mouth shape and an expansion starter 22 in a lower bell mouth shape, and an upper expansion cone 4 of a slip seating and hanging mechanism 24 is preset in the expansion outlet 23. The tail pipe 16 is in threaded connection with an expansion starter 22 at the bottom of the expansion suspension cylinder 1 through a buckle-change connector 15.
The suspension sealing mechanism 25 mainly comprises a metal slip 2 and a multi-section sealing cylinder 3, wherein the metal slip 2 and the sealing cylinder 3 are both fixed on the outer surface of the expansion suspension cylinder 1. The metal slip 2 is composed of a plurality of slip blocks 201 which are arranged in a circle, and slip teeth 202 are processed on the slip blocks 201. The adjacent slip blocks 201 are fixed through connecting ribs 203 at the lower part and the middle part, and the upper parts of the slip blocks 201 are fixed through fixing rings 204. The outer diameter of the fixing ring 204 is slightly smaller than the outer diameter of the slip block 201, the connecting rib 203 can be an open non-closed loop structure, and the outer diameter of the connecting rib 203 is smaller than the outer diameter of the slip block 201. Circulation channels 205 are present at the connecting ribs 203 between adjacent slip segments 201.
The sealing cylinder 3 is formed by matching and combining a rubber cylinder 301, a trapezoidal metal ring 302 and a sawtooth metal ring 303 in a form, so that a metal and rubber double composite sealing material is formed. The rubber tube 301 is made of high temperature resistant fluororubber, the outer surface of the expansion suspension tube 1 at the rubber tube 301 is provided with metal protrusions, the trapezoidal metal ring 302 is in a structure with a wide outer part and a narrow inner part, the trapezoidal metal ring 302 and the sawtooth-shaped metal ring 303 are made of soft metal materials such as brass,
the outer diameters of the trapezoidal metal rings 302 and the zigzag metal rings 303 are slightly smaller than the outer diameter of the rubber cylinder 301, the trapezoidal metal rings 302 between the upper and lower adjacent rubber cylinders 301 are of a structure with wide outer part and narrow inner part, and the rubber cylinder 301 is not easy to degum in the expansion process of the expansion suspension cylinder 1. After expansion, the sealing cylinder 3 is compressed between the expanding suspension cylinder 1 and the technical casing 21, forming a metal and rubber double material seal.
The slip sitting and hanging mechanism 24 comprises a central tube 7, an upper expansion cone 4 and a hydraulic mechanism 6, wherein the upper expansion cone 4 positioned on the central tube 7 is arranged at the position of an expansion outlet 23 of the expansion hanging cylinder 1, the upper expansion cone 4 is provided with a downward expansion cone surface, and the upper expansion cone 4 is sleeved on the central tube 7 and can axially move. The lower part of the central tube 7 is provided with a limit structure for limiting the upper expansion cone 4 axially moving on the central tube 7.
The hydraulic cylinder mechanism 6 is connected with the central pipe 7, and the upper expansion cone 4 is arranged below the hydraulic cylinder mechanism 6 and is preset in the expansion outlet 23. The liquid cylinder mechanism 6 is provided with a liquid inlet hole, the liquid cylinder mechanism 6 can be a multi-stage liquid cylinder structure, the stage number of the liquid cylinder is set according to the sitting and hanging pressure of the metal slips 2, and the construction operation safety is ensured.
The expansion mechanism 26 is composed of an expansion mandrel 9, a lower expansion cone 5 and a fixed short joint 8. The lower expansion cone 5 is in a cone-column-shaped through hole structure and is sleeved on the expansion mandrel 9, and an upward expansion conical surface is arranged on the surface of the lower expansion cone 5. The lower part of the fixed short section 8 is fixedly connected with the expansion mandrel 9, the upper part of the fixed short section 8 is fixedly connected with the central tube 7, and the lower expansion cone 5 is fixed on the expansion mandrel 9. The expansion mechanism 26 is preset in the expansion starter 22 of the expansion suspension cylinder 1 and is used for expanding and hanging the expansion suspension cylinder 1 to realize tail pipe suspension sealing.
The reversing mechanism 27 is positioned at the lower part of the expansion mechanism 26 and consists of the bearing mandrel 10, the bearing 11, the spring sleeve 12, the spring 13 and the reversing connector 14. The bearing mandrel 10 is provided with an inverted joint 14, the inverted joint 14 rotates along with the bearing mandrel 10 and can axially move on the bearing mandrel 10, and inverted threads are machined on the inverted joint 14. The bearing mandrel 10 at the upper part of the inverted joint 14 is sleeved with a spring 13 and a spring sleeve 12, the spring 13 is positioned between the bearing mandrel 10 and the spring sleeve 12, and the spring sleeve 12 can compress the spring 13 and move axially along the bearing mandrel 10. The upper part of the bearing mandrel 10 is fixedly connected with the expansion mandrel 9 through threads, a bearing 11 is arranged between a spring sleeve 12 on the bearing mandrel 10 and the expansion mandrel 9, and the inverted joint 14 is connected with the variable buckle joint 15 through inverted threads in a matched mode.
A hollow rubber plug 18 which is preset in a tail pipe 16 is connected to the bottom of a bearing mandrel 10 through a rubber plug rod 17, the hollow rubber plug 18 is connected with the rubber plug rod 17 through a pin, the inner diameter of the hollow rubber plug 18 is smaller than the outer diameter of a drill rod rubber plug, when the drill rod rubber plug enters the hollow rubber plug 18, the drill rod rubber plug is blocked downwards, shearing is carried out under the condition of pressure difference, and the pin is cut off.
The rubber tube 301 of the suspension sealing mechanism 25 is made of high-temperature-resistant fluororubber, the outer surface of the expansion suspension tube 1 at the rubber tube 301 part can be processed with metal projections, and the trapezoid metal ring 302 and the sawtooth metal ring 303 are made of soft metal materials such as brass.
The double-suspension double-sealing high-temperature-resistant expansion hanger comprises an expansion suspension cylinder 1, a buckle joint 15 and a tail pipe 16 which are sequentially connected through threads to form an outer tubular column, and an inner tubular column which is formed by sequentially connecting a rubber plug rod 17, a bearing mandrel 10, an expansion mandrel 9, a fixed short section 8, a central tube 7, a hydraulic cylinder mechanism 6 and a feeding drill rod 19 through threads.
The operation procedure of the expansion hanger mainly comprises the following steps: tail pipe 16 goes into, back-off, metal slips 2 sits and hangs and hang a section of thick bamboo 1 and hang.
The method comprises the following steps: tail pipe 16 is run in. Referring to FIG. 4, when tail pipe 16 is run in the field, the assembled expansion hanger is connected to the upper portion of the string of tail pipe 16, and then is connected to the accompanying pipe by drill pipe 19, thereby completing the safe running of the string of tail pipe 16. When the tail pipe 16 is in the running process, the phenomenon of blockage occurs, and the auxiliary running of the pipe string can be carried out by lifting and lowering the movable drill pipe 19.
Step two: and (5) performing circulation reversing. Referring to fig. 5, after the tail pipe 16 is lowered to a designed well depth, a circulation well-flushing is performed, and a back-off releasing operation is performed before a cementing operation. During back-off operation, the hanging weight of the drilling tool is adjusted, a neutral point of the drilling tool is found, and the pipe column is reversely turned over. Due to the influences of well track and friction resistance factors, even if the hanging weight of the wellhead drilling tool is adjusted to find a neutral point, the reversing mechanism of the expansion hanger can be in a lifting or pressing state, the drilling tool can be lifted or pressed down to a certain load at the load position of the neutral point, the reversing joint 14 can axially slide on the bearing mandrel 10, the spring sleeve 12 can compress the spring 13 to move up and down, so that a certain load can be absorbed, the bearing mandrel 10 has a certain moving stroke, and the reversing thread bears a smaller axial force. The drill rod 19 is rotated forward, the bearing mandrel 10 drives the back-off connector 14 to rotate, the spring 13 and the spring sleeve 12 rotate relative to the expansion mandrel 9 through the bearing 11, so that the back-off threads connected with the back-off connector 14 and the buckle-changing connector 15 are disengaged, and the releasing operation is completed. Compared with the conventional back-off thread release, the back-off mechanism 27 can reduce the axial force of the back-off thread, is convenient for finding a neutral point load and improves the back-off success rate.
Step three: the slips are hung. Referring to the attached drawings 1 and 6, after the back-off of the expansion hanger is finished, the lower expansion cone 5 on the expansion mandrel 9 is in conical contact with an expansion starter 22 of the expansion hanging cylinder 1, and cementing and drill rod plug 20 replacement are performed according to a normal procedure. When the drill rod rubber plug 20 is blocked by the hollow rubber plug 18 which is replaced to the bottom of the rubber plug rod 17, internal pressure is formed, hydraulic pressure is transmitted to the hydraulic cylinder mechanism 6, the hydraulic cylinder mechanism 6 pushes the upper expansion cone 4 to move downwards along the central pipe 7, and the expansion outlet 23 at the upper part of the expansion suspension cylinder 1 and the metal slip 2 are sealed in an expansion mode. When the metal slip 2 is sealed, the slip blocks 201 are not expanded, but the connecting ribs 203 connecting the slip blocks 201 are stretched, and the slip teeth 202 on the slip blocks 201 are pressed and anchored on the inner wall of the technical casing 21. When the upper expansion cone 4 moves downwards to the position of the limiting structure at the lower part of the central pipe 7 and does not move downwards continuously, the metal slip 2 is hung after being seated.
The hydraulic cylinder mechanism 6 is of a multi-stage hydraulic cylinder structure, and the hydraulic cylinder stage number of the hydraulic cylinder mechanism 6 can be adjusted according to the hanging pressure of the metal slips 2. After the metal slips 2 are hung, a circulation channel 205 is still arranged at the connecting rib 203 between the slip blocks 201, and liquid can be allowed to circulate. And the hollow rubber plug 18 is continuously pressed and sheared, the hollow rubber plug 18 is separated from the rubber plug rod 17, and the hollow rubber plug is continuously replaced and descended to the well cementation accessory for impacting.
Step four: the hanger is hung on the seat. Referring to the attached figure 7, after the hollow rubber plug 18 is pressed, the wellhead continues to be pressed to the designed pressure, when the hanging weight of the wellhead drilling tool descends, the drilling tool is lifted, the lower expansion cone 5 is pushed by hydraulic pressure to expand the expansion suspension cylinder 1, and the sealing cylinder 3 on the suspension sealing mechanism 25 is expanded and extruded between the expansion suspension cylinder 1 and the technical casing 21, so that powerful mechanical sealing made of metal and rubber is formed. When the lower expansion cone 5 expands to the sealing cylinder 3, the seating pressure of the sealing cylinder 3 is higher than the internal pressure of the expansion suspension cylinder 1 due to extrusion of the sealing cylinder, so that the seated metal slip 2 can provide mechanical supporting force to avoid overhigh expansion pressure, and the seating expansion pressure at the sealing cylinder 3 is reduced.
Step five: and releasing the well completion. Referring to the attached figure 8, when the lower expansion cone 5 completely completes the expansion of the expansion suspension cylinder 1, the lower expansion cone 5 is released from the expansion suspension cylinder 1 under the action of hydraulic pressure and mechanical lifting force, the pressure of the wellhead is relieved, the expansion seating of the expansion suspension cylinder 1 is completed, and after redundant cement slurry is circulated out of the wellhead, the drilling tool is lifted up to complete the well.
The double-suspension double-sealing type high-temperature-resistant expansion hanger can realize double suspension of the metal slip 2 and the sealing cylinder 3 and double sealing of metal and rubber after being hung, effectively improves the suspension force of the expansion hanger, obviously improves the sealing capability of the expansion hanger under the high-temperature condition, and is suitable for tail pipe well completion operation under the conditions of a thermal production well, a deep well and an ultra-deep well under the high-temperature well condition.
Claims (10)
1. The double-suspension double-sealing high-temperature-resistant expansion hanger comprises an expansion suspension cylinder (1), a slip seating and hanging mechanism (24), a suspension sealing mechanism (25), an expansion mechanism (26) and is characterized by also comprising an inverse buckle mechanism (27);
the expansion hanging cylinder (1) is an expandable short section, and the top and the bottom of the expansion hanging cylinder are respectively provided with an expansion outlet (23) which is expanded in advance and is in an upper bell mouth shape and an expansion starter (22) which is in a lower bell mouth shape; the bottom of the expansion suspension cylinder (1) is fixedly connected with a tail pipe (16) through a buckle changing joint (15);
the slip sitting and hanging mechanism (24) comprises a central pipe (7), an upper expansion cone (4) and a hydraulic mechanism (6), the hydraulic cylinder mechanism (6) is connected with the upper expansion cone (4), the upper expansion cone (4) is provided with a downward expansion conical surface and is preset at an expansion outlet (23) of the expansion hanging cylinder (1), the upper expansion cone (4) and the central pipe (7) form axial sliding sealing fit, the hydraulic cylinder mechanism (6) is provided with a liquid inlet hole communicated with the central pipe, and the hydraulic cylinder mechanism (7) is of a one-stage or multi-stage hydraulic cylinder structure; a limiting structure is arranged on the central tube (7) at the lower stroke stop point of the upper expansion cone (4), and the limiting structure is in limiting fit with the upper expansion cone (4) which axially moves on the central tube (7);
the suspension sealing mechanism (25) comprises a metal slip (2) and a sealing cylinder (3) which are fixed on the outer surface of the expansion suspension cylinder (1), the metal slip (2) is composed of a plurality of slip blocks (201) which are arranged in a circumferential mode, and a circulation channel (205) is preset between every two adjacent slip blocks (201);
the expansion mechanism (26) comprises an expansion mandrel (9) and a lower expansion cone (5), the expansion mechanism (26) is preset in an expansion starter (22) of the expansion suspension cylinder (1), the expansion mandrel (9) and the lower expansion cone (5) are of an integrated hollow structure or a combined sleeved hollow structure, and the outer surface of the lower expansion cone (4) is provided with an upward expansion conical surface; the upper part of the expansion mandrel (9) is fixedly connected with the central pipe (7);
the back-off mechanism (27) is positioned at the lower part of the expansion mechanism (26) and comprises a hollow rubber plug (18), a bearing mandrel (10), a bearing (11), a spring sleeve (12), a spring (13), a back-off joint (14) and a buckle-changing joint (15); the bearing mandrel (10) is provided with an inverted buckle joint (14), inverted threads are arranged on the inverted buckle joint (14), and the inverted buckle joint (14) is connected with the variable buckle joint (15) in a matched mode through the inverted threads; the back-off joint (14) and the bearing mandrel (10) form circumferential synchronous rotation and circumferential sliding fit; a bearing mandrel (10) at the upper part of the back-off joint (14) is provided with a spring (13) and a spring sleeve (12), the spring (13) is positioned between the bearing mandrel (10) and the spring sleeve (12), the upper part of the bearing mandrel (10) is fixedly connected with an expansion mandrel (9), and a bearing (11) is arranged between the spring sleeve (12) on the bearing mandrel (10) and the expansion mandrel (9); the hollow rubber plug (18) is connected to the bottom of the bearing mandrel (10) through a pin;
the expansion hanging cylinder (1) and the buckle changing joint (15) are fixedly connected in sequence from top to bottom to form an outer pipe column; the hydraulic cylinder mechanism (6), the central pipe (7), the expansion mandrel (9), the bearing mandrel (10) and the hollow rubber plug (18) are sequentially and fixedly connected from top to bottom to form an inner pipe column.
2. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 1, wherein: the sealing cylinder (3) is formed by one or a plurality of rubber cylinders (301), rubber cylinders (301) -trapezoidal metal rings (302) or rubber cylinders (301) -sawtooth metal rings (303) in a matching and combining manner.
3. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 2, wherein: the rubber tube (301) is made of high-temperature-resistant fluororubber, and the outer surface of the expansion suspension tube (1) at the rubber tube (301) is provided with a metal bulge in limit fit with the rubber tube (301).
4. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 3, wherein: the trapezoid metal ring (302) is of a structure with a wide outer part and a narrow inner part, the trapezoid metal ring (302) and the sawtooth-shaped metal ring (303) are made of soft metal materials, and the outer diameter of the trapezoid metal ring is slightly smaller than that of the rubber cylinder (301).
5. A double-suspension double-seal type high-temperature-resistant expansion hanger as claimed in any one of claims 1 to 4, wherein: slip teeth (202) are processed on the slip blocks (201), and adjacent slip blocks (201) are fixed through connecting ribs (203) and fixing rings (204); the connecting rib (203) is of an open non-closed loop structure, and the outer diameter of the connecting rib (203) is smaller than that of the slip block (201); the outer diameter of the fixing ring (204) is slightly smaller than that of the slip block (201).
6. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 5, wherein: the adjacent slip blocks (201) are fixed through connecting ribs (203) at the lower part and the middle part, and the upper parts of the slip blocks (201) are fixed through fixing rings (204).
7. A double-suspension double-seal type high-temperature-resistant expansion hanger as claimed in any one of claims 1 to 4, wherein: the back-off mechanism (27) further comprises a rubber plug rod (17), a hollow rubber plug (18) is fixedly installed at the bottom of the rubber plug rod (17) through a pin, the rubber plug rod (17) is connected with the bearing mandrel (10), and the hollow rubber plug (18) is arranged in a tail pipe (16) connected with the expansion hanger in advance.
8. A double-suspension double-seal type high-temperature-resistant expansion hanger as claimed in any one of claims 1 to 4, wherein: the suspension sealing mechanism (25) further comprises a fixed short section (8), and the expansion mandrel (9) and the lower expansion cone (5) are fixedly connected with the central pipe (7) above through the fixed short section (8).
9. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 5, wherein: the back-off mechanism (27) further comprises a rubber plug rod (17), a hollow rubber plug (18) is fixedly installed at the bottom of the rubber plug rod (17) through a pin, the rubber plug rod (17) is connected with the bearing mandrel (10), and the hollow rubber plug (18) is arranged in a tail pipe (16) connected with the expansion hanger in advance.
10. The double-suspension double-seal high-temperature-resistant expansion hanger of claim 5, wherein: the suspension sealing mechanism (25) further comprises a fixed short section (8), and the expansion mandrel (9) and the lower expansion cone (5) are fixedly connected with the central pipe (7) above through the fixed short section (8).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910633506.9A CN112227992A (en) | 2019-07-15 | 2019-07-15 | Double-suspension double-sealing type high-temperature-resistant expansion hanger |
| PCT/CN2020/101609 WO2021008483A1 (en) | 2019-07-15 | 2020-07-13 | Expansion hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910633506.9A CN112227992A (en) | 2019-07-15 | 2019-07-15 | Double-suspension double-sealing type high-temperature-resistant expansion hanger |
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| Publication Number | Publication Date |
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| CN112227992A true CN112227992A (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910633506.9A Pending CN112227992A (en) | 2019-07-15 | 2019-07-15 | Double-suspension double-sealing type high-temperature-resistant expansion hanger |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112227992A (en) |
| WO (1) | WO2021008483A1 (en) |
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| CN114837605B (en) * | 2022-05-31 | 2024-05-03 | 中国石油化工股份有限公司 | Oil increasing method for casing damage well hole-repairing-free suspension |
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| WO2021008483A1 (en) | 2021-01-21 |
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