CN109736740B - Composite driving mandrel anchoring casing head - Google Patents
Composite driving mandrel anchoring casing head Download PDFInfo
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- CN109736740B CN109736740B CN201910162973.8A CN201910162973A CN109736740B CN 109736740 B CN109736740 B CN 109736740B CN 201910162973 A CN201910162973 A CN 201910162973A CN 109736740 B CN109736740 B CN 109736740B
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- slip
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- 238000004873 anchoring Methods 0.000 title claims abstract description 195
- 239000002131 composite material Substances 0.000 title claims description 23
- 230000005284 excitation Effects 0.000 claims abstract description 61
- 238000007789 sealing Methods 0.000 claims description 54
- 210000004907 gland Anatomy 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract description 12
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 210000002445 nipple Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000012190 activator Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 150000008363 butyronitriles Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention discloses a compound driving mandrel anchoring casing head, which relates to the technical field of wellhead devices and comprises a casing head shell and an anchoring mandrel unit, wherein a pressurizing hole is further formed in the side wall of the casing head shell, a first end of the pressurizing hole is connected with an anchoring hole part, and a second end of the pressurizing hole extends to the outer side of the casing head shell; the anchoring mandrel unit comprises an anchoring mandrel body, and a slip excitation piece, an anchoring slip and an annular piston body which are sequentially sleeved on the outer side of the anchoring mandrel body from top to bottom. The casing head can meet the requirement of the suspension of the mandrel suspension device, and after the anchoring mandrel body and the casing head shell are anchored, the pipe column movement can be avoided, and the stability and the reliability of the casing head are improved.
Description
Technical Field
The invention relates to the technical field of wellhead devices, in particular to a composite driving mandrel anchoring casing head.
Background
In the use process of the mandrel hanger, pressure exists in the annulus due to the reasons of well cementation quality or casing damage and the like, so that relative movement is generated between the mandrel hanger and the casing head body, sealing failure is caused, and even accidents are caused.
How to design a casing head capable of avoiding pipe column movement and increasing stability and reliability of the casing head while meeting the suspension of a mandrel suspension device is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a compound driving mandrel anchoring casing head aiming at the technical problems in the prior art, and aims to solve the technical problems that the casing head can avoid pipe column movement and increase the stability and reliability of the casing head while meeting the suspension of a mandrel hanger.
To achieve the above technical purpose, an embodiment of the present invention provides a composite driving mandrel anchoring casing head, including:
the casing head shell is provided with a vertically arranged inner hole, the inner hole is provided with an anchoring hole part and a taper hole part, the anchoring hole part is positioned at the upper side of the taper hole part and is connected with the large end of the taper hole part; the side wall of the casing head shell is also provided with a pressurizing hole, a first end of the pressurizing hole is connected with the anchoring hole part, a second end of the pressurizing hole extends to the outer side of the casing head shell, and a one-way valve is arranged at the second end of the pressurizing hole; and
the anchoring mandrel unit comprises an anchoring mandrel body, a slip excitation piece, an anchoring slip and an annular piston body, wherein the slip excitation piece, the anchoring slip and the annular piston body are sequentially sleeved on the outer side of the anchoring mandrel body from top to bottom, and the anchoring mandrel body can be arranged on the taper hole part in a sitting mode, and a main seal is arranged at the joint of the anchoring mandrel body and the taper hole part; the annular piston body can be arranged in an annular space between the anchoring core shaft body and the anchoring hole part, the inner contour of the annular piston body and the anchoring core shaft body can slide up and down and are in sealing connection, and the outer contour of the annular piston body and the anchoring hole part can slide up and down and are in sealing connection; a first end of the pressurizing hole is connected with a cavity between the annular piston body and the main seal; the upper end of the annular piston body is propped against the lower end of the anchoring slip; the anchoring slips are distributed around the central axis of the anchoring mandrel body; the outer contour of the slip excitation piece is provided with an excitation conical surface, and the small end of the excitation conical surface is positioned close to the anchoring slip side; the anchoring slips are provided with an inner conical surface matched with the excitation conical surface, and the excitation conical surface is in contact with the inner conical surface; and the outer side of the anchoring slip is provided with a tooth-shaped surface, and the tooth-shaped surface corresponds to the anchoring hole part.
Preferably, the anchoring mandrel body is provided with a plurality of dovetail protrusions, the dovetail protrusions extend along the central axis direction of the anchoring mandrel body, and the dovetail protrusions are matched with dovetail grooves in the anchoring slips.
Preferably, an auxiliary sealing part is arranged on the outer contour of the anchoring mandrel body, the auxiliary sealing part is in sealing connection with the anchoring hole part, and the auxiliary sealing part is positioned between the main seal and the annular piston body; the first end of the pressurizing hole is connected with the cavity between the auxiliary sealing part and the annular piston body.
Preferably, at least one annular sealing groove is arranged on the auxiliary sealing part, and a sealing piece is arranged in the annular sealing groove.
Preferably, a plurality of jackscrews which radially penetrate through the side wall of the casing head shell are uniformly distributed on the casing head shell, and the front ends of the jackscrews are provided with conical tops; and the outer top end of the slip excitation piece is provided with an excitation piece outer conical surface matched with the conical top.
Preferably, the inner top end of the slip excitation piece is provided with an excitation piece inner taper hole, the anchoring mandrel unit further comprises a compression nut plate, the compression nut plate is in threaded connection with the top of the anchoring mandrel body, and the outer side of the compression nut plate is provided with a taper part matched with the excitation piece inner taper hole.
Preferably, a first pressing groove is formed in the outer side of the lower end of the annular piston body, and the first pressing groove is connected with the first end of the pressing hole.
Preferably, the main seal comprises a first seal ring, a second seal ring and a fastening ring, wherein the first seal ring is positioned on the upper side of the second seal ring, the fastening ring is positioned on the lower side of the second seal ring, and the fastening ring is in threaded connection with the anchoring mandrel body.
Preferably, the fit of the dovetail groove and the dovetail bulge is provided with a gap.
Preferably, a plurality of stressing holes are uniformly distributed on the upper top surface of the compression nut plate.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages: a composite driving mandrel anchoring casing head comprises a casing head shell and an anchoring mandrel unit, wherein the anchoring mandrel unit is seated in the casing head shell. The casing head can meet the requirement of the suspension of the mandrel suspension device, avoid the pipe column from moving, and increase the stability and the reliability of the casing head.
Further, the casing head housing has a vertically disposed internal bore having an anchoring bore portion and a tapered bore portion. The taper hole part provides supporting force for the anchoring mandrel unit on one hand, and on the other hand, the taper hole part is in sealing connection with the anchoring mandrel unit, so that the annular space of the sleeve is sealed.
Further, the annular piston body, the anchoring slips and the slip excitation piece are combined to form a hydraulic excitation mechanism, the annular piston body can be installed in an annular space between the anchoring mandrel body and the anchoring hole portion, the inner contour of the annular piston body and the anchoring mandrel body can slide up and down and are in sealing connection, the outer contour of the annular piston body and the anchoring hole portion can slide up and down and are in sealing connection, and the first end of the pressurizing hole is connected with a cavity between the annular piston body and the main seal. When the pressure medium is injected into the cavity through the pressurizing hole, the lower end of the cavity is sealed, and the pressure medium can push the annular piston body to move upwards. The upper end of the annular piston body is propped against the lower end of the anchoring slip, so that force is transferred to the anchoring slip, and the anchoring slip is further pushed to move upwards. The anchoring slips are gradually moved outwards along the radial direction under the action of the radially outward pushing force of the excitation conical surface in the upward moving process. And the outer side of the anchoring slip is provided with a tooth-shaped surface, and the tooth-shaped surface corresponds to the anchoring hole part. The tooth-shaped surface is in meshed contact with the anchoring hole part, so that the anchoring of the anchoring mandrel body and the casing head shell is realized.
Still further, form the dovetail connection structure between dovetail and the dovetail protruding, and the cooperation department has certain gap between dovetail and the dovetail protruding. The dovetail connection structure can prevent the anchoring slips from falling from the anchoring mandrel body, and on the other hand, the anchoring slips are allowed to slightly move in the axial direction and the radial direction of the anchoring mandrel body to perform anchoring actions.
Still further, when injecting pressure-bearing medium into this cavity through the pressurization hole, the anchor dabber body forms piston structure on the whole, and pressure-bearing medium can exert decurrent pressure to the anchor dabber body, and this decurrent pressure can improve the contact pressure of main seal department, further improves the sealed effect of main seal. In addition, the seal formed by the auxiliary seal portion and the anchoring hole portion of the casing head housing also improves the sealing performance between the anchoring mandrel unit and the casing head housing as a whole.
Still further, the jackscrew, slip energizer and anchoring slip are combined into a first manual energizing mechanism. The tail part of the jackscrew is rotated, the conical top part at the front end of the jackscrew extrudes and excites the outer conical surface, so that the slip excitation piece moves downwards along the axial direction of the anchoring mandrel body, and the excitation conical surface on the slip excitation piece extrudes the inner conical surface of the anchoring slip, so that the anchoring slip moves outwards in the radial direction, and anchoring is realized.
Still further, the gland nut plate, the slip excitation member and the anchoring slips form a second manual excitation mechanism, the gland nut plate can be rotated by using an auxiliary tool (such as a stress rod, a bolt and the like) through a stress application hole in the gland nut plate, the conical part of the gland nut plate extrudes the inner conical hole of the excitation member in the slip excitation member to push the slip excitation member to move downwards, and the slip excitation member can also excite the anchoring slips to realize anchoring between the anchoring mandrel unit and the casing head casing.
In summary, the hydraulic excitation mechanism is formed on the anchoring sleeve head of the composite driving mandrel, and the first manual excitation mechanism and the second manual excitation mechanism can be formed, so that each excitation mechanism can work independently to realize excitation of the anchoring slips, and can be combined according to field requirements. The casing head can meet the requirement of the suspension of the mandrel suspension device, and after the anchoring mandrel body and the casing head shell are anchored, the pipe column movement can be avoided, and the stability and the reliability of the casing head are improved.
Drawings
FIG. 1 is a schematic diagram of a compound drive mandrel anchoring casing head according to one embodiment of the present invention;
FIG. 2 is a schematic illustration of the configuration of a casing head in a composite drive mandrel anchored casing head in accordance with one embodiment of the present invention;
FIG. 3 is a schematic illustration of the structure of an anchoring mandrel unit in a compound drive mandrel anchoring sleeve head according to one embodiment of the present invention (cross-hatching is omitted for ease of viewing);
FIG. 4 is a partial enlarged view A of FIG. 3;
fig. 5 is a schematic structural view of an annular piston body in a composite drive mandrel anchor casing head in accordance with one embodiment of the present invention;
FIG. 6 is a cross-sectional view B-B of FIG. 3;
FIG. 7 is a schematic illustration of the configuration of a slip excitation in a composite drive mandrel anchored casing head in accordance with one embodiment of the present invention;
FIG. 8 is a top view of a compression nut plate in a compound drive mandrel anchor casing head according to one embodiment of the present invention;
FIG. 9 is a schematic illustration of the principle of operation of a gland nut plate of a composite drive mandrel anchor casing head in accordance with one embodiment of the present invention;
fig. 10 is a schematic diagram of the composition of the primary seal in a composite drive mandrel anchor casing head in accordance with one embodiment of the present invention.
In the drawing the view of the figure,
10-casing head shell, 11-anchoring hole part, 12-pressurizing hole, 13-taper hole part and 14-top thread hole;
a 20-anchor mandrel unit which,
21-an anchoring mandrel body, 211-a dovetail projection, 212-an auxiliary sealing portion, 2121-an annular sealing groove, 213-a second pressing groove,
22-annular piston body, 221-first compression groove, 222-outer sealing sliding surface, 223-inner sealing sliding surface,
23-anchoring slips, 231-dovetail grooves, 232-tooth surfaces, 233-inner conical surfaces,
24-slip excitation member, 241-excitation cone, 242-excitation member inner cone hole, 243-first guide hole, 244-second guide hole, 245-excitation member outer cone,
25-gland nut plate, 251-conical part, 252-stressing hole, 26-auxiliary sealing ring, 27-main sealing, 271-first sealing ring, 272-second sealing ring, 273-fastening ring, 274-third sealing ring, 275-fourth sealing ring, 28-double male nipple;
30-a one-way valve;
40-jackscrews, 41-conical tops;
50-wellhead valve, 60-pressure measuring piece and 70-stressing rod.
Detailed Description
The invention is explained and illustrated in detail below with reference to the drawings.
Referring to fig. 1, a composite driving mandrel anchoring casing head comprises a casing head shell 10 and an anchoring mandrel unit 20, wherein the anchoring mandrel unit 20 is seated in the casing head shell 10 and is anchored with the casing head shell 10, so that the suspension of a mandrel hanger can be satisfied, the movement of a tubular column is avoided, and the stability and reliability of the casing head are improved.
Generally, the outside of casing head housing 10 may also be fitted with a plurality of wellhead valves 50 and pressure measurement members 60. Wellhead valve 50 may be, for example, a plate valve; the pressure measuring element 60 may be, for example, a pressure gauge.
Referring to fig. 2, the casing head housing 10 has a vertically disposed internal bore having an anchoring bore portion 11 and a tapered bore portion 13. The taper hole part 13 provides supporting force for the anchoring mandrel unit 20 on one hand, and on the other hand, the taper hole part 13 is in sealing connection with the anchoring mandrel unit 20, so that the annular space of the sleeve is sealed.
The anchor hole 11 is located above the taper hole 13, and the anchor hole 11 is connected to the large end of the taper hole 13. In the present embodiment, the inner hole diameter of the anchor hole portion 11 is the same as the large end diameter of the taper hole portion 13, but it should be understood that the inner hole diameter of the anchor hole portion 11 may be larger than the large end diameter of the taper hole portion 13, and is not particularly limited herein. The anchor hole 11 and the taper hole 13 may be directly connected to each other or may be indirectly connected to each other through other structures.
The casing head housing 10 is further provided with a pressurizing hole 12 on a side wall thereof, a first end of the pressurizing hole 12 is connected with the anchoring hole portion 11, and a second end of the pressurizing hole 12 extends to an outside of the casing head housing 10. In this embodiment, the direction of the pressurization hole 12 is along the radial direction of the casing head housing 10, or is horizontal, but the pressurization hole 12 may be inclined as required.
Preferably, a check valve 30 is installed at the second end of the pressurizing hole 12, and the check valve 30 functions to restrict the flow direction of the pressurized medium when the pressurized medium (e.g., hydraulic oil, water, etc.) is injected into the inside of the casing head housing 10 through the pressurizing hole 12. Further, it should be understood that check valve 30 may be integrated into pressurized bore 12, or check valve 30 may be attached to the casing head installation tool.
Referring to fig. 3 and 4, the anchoring mandrel unit 20 includes an anchoring mandrel body 21, a slip activator 24, an anchoring slip 23, and an annular piston body 22, which are sequentially sleeved outside the anchoring mandrel body 21 from top to bottom. The lower end of the anchoring mandrel body 21 may be connected to a double male nipple 28, the double male nipple 28 being adapted for connection to a tubular string (e.g., a surface casing).
The anchoring mandrel body 21 can sit on the tapered bore portion 13 and a main seal 27 is provided at the junction of the anchoring mandrel body 21 and the tapered bore portion 13. Preferably, referring to fig. 3, the main seal 27 comprises a first seal ring 271, a second seal ring 272 and a fastening ring 273, the first seal ring 271 being located on the upper side of the second seal ring 272, the first seal ring 271 being sandwiched between the second seal ring 272 and the anchoring mandrel body 21. The fastening ring 273 is located at the lower side of the second seal ring 272, and the fastening ring 273 is screwed with the anchoring mandrel body 21 to fix the second seal ring 272 and the first seal ring 271 to the anchoring mandrel body 21. The outer side of the lower end of second seal ring 272 is provided with a chamfer structure matching conical portion 251 of casing head housing 10. In this embodiment, the first seal 271 is preferably made of a flexible material (e.g., rubber), and the second seal 272 is preferably made of a metal material.
It should be appreciated that the construction of the primary seal 27 has a variety of options. Referring to fig. 10, the following structure is also possible: the main seal 27 comprises a fourth seal ring 275, a third seal ring 274, a first seal ring 271, a second seal ring 272 and a fastening ring 273 which are sleeved on the anchoring mandrel body 21 from top to bottom, wherein the fourth seal ring 275 preferably has a rectangular cross section and is made of flexible materials (such as high saturated hydrogenated butyronitrile); the third seal ring 274, the first seal ring 271 and the second seal ring 272 form a combined seal, wherein the third seal ring 274, the first seal ring 271 and the second seal ring 27 are preferably made of metal, and the first seal ring 271 is preferably made of flexible metal (e.g. 304SS or 316SS, etc.). In this embodiment, the cross sections of the third seal ring 274 and the first seal ring 271 are each provided with a trapezoid structure protruding toward the second seal ring 272, and the cross section of the second seal ring 272 is provided with a trapezoid groove accommodating the trapezoid structure. When the anchoring mandrel body 21 is loaded, the third seal ring 274 and the first seal ring 271 compress the second seal ring 272 causing it to radially outwardly protrude into sealing engagement with the casing head housing 10.
The annular piston body 22 is capable of being installed in an annular space between the anchoring mandrel body 21 and the anchoring hole portion 11, and an inner contour (refer to an inner seal sliding surface 223 in fig. 5) of the annular piston body 22 is slidably and sealingly connected up and down with the anchoring mandrel body 21, and an outer contour (refer to an outer seal sliding surface 222 in fig. 5) of the annular piston body 22 is slidably and sealingly connected up and down with the anchoring hole portion 11, and a first end of the pressurizing hole 12 is connected with a cavity between the annular piston body 22 and the main seal 27. When the pressure medium is injected into the cavity through the pressurizing hole 12, the lower end of the cavity is sealed, and the pressure medium can push the annular piston body 22 to move upwards. An annular groove body is arranged in the outer contour of the annular piston body 22, and a sealing element (such as an O-shaped rubber sealing ring and the like) can be installed in the groove body, so that the outer contour of the annular piston body 22 and the anchoring hole part 11 of the casing head shell 10 are in sealing and sliding connection. In this embodiment, a groove body, in which a sealing member can be installed, is also provided on the outer side surface of the anchoring mandrel body 21 at a position corresponding to the inner side surface of the annular piston body 22, so that a sealing and slidable connection is also achieved between the inner contour of the annular piston body 22 and the anchoring mandrel body 21. It should be noted that the groove for mounting the sealing ring may be provided on the opposite surface, for example, the groove for mounting the sealing ring may be provided on the inner surface of the annular piston body 22 while removing the groove provided on the outer contour of the anchoring mandrel body 21.
Referring to fig. 4 and 5, the outer side of the lower end of the annular piston body 22 is provided with a first pressing groove 221. The first pressing groove 221 is connected to a first end of the pressing hole 12. Further preferably, a second pressing groove 213 may be further provided on the anchoring mandrel body 21 at a position adjacent to the first pressing groove 221. The first pressure groove 221 and the second pressure groove 213 form an annular cavity for facilitating the injection of the pressure medium. It is understood that the same effect can be achieved by providing only the second pressing groove 213.
Referring to fig. 4 and 6, the anchoring slips 23 are four, and the four anchoring slips 23 are laid around the central axis of the anchoring mandrel body 21. Of course, the anchoring slips 23 may be provided in other numbers, such as 3 or 5 or 6.
Referring to fig. 4 and 7, the outer profile of the slip segment 24 is provided with an excitation cone 241, the small end of the excitation cone 241 being located on the side closer to the anchoring slip 23. The anchoring slips 23 have an internal taper 233 that mates with an excitation taper 241, the excitation taper 241 being in contact with the internal taper 233. The slip energizer 24 is concentrically connected to the anchoring mandrel body 21 by a first guide hole 243 so that the slip energizer 24 can move along the central axis of the anchoring mandrel body.
The annular piston body 22, the anchoring slips 23 and the slip energizer 24 described above combine to form a hydraulic energizing mechanism. The working principle of the hydraulic excitation mechanism is as follows: when the pressure medium is injected into the first pressure groove 221 and/or the second pressure groove 213 through the pressure hole 12, the pressure medium pushes the ring-shaped piston body 22 upward. The upper end of the annular piston body 22 abuts against the lower end of the anchoring slips 23, transmitting force to the anchoring slips 23, pushing the anchoring slips 23 upward. The anchoring slips 23 are pushed by the excitation cone 241 during their upward movement and gradually move outward in the radial direction. The outer side of the anchoring slip 23 is provided with a tooth surface 232, and the tooth surface 232 corresponds to the anchoring hole 11. The tooth surface 232 is anchored with the anchoring hole 11, so that the anchoring of the anchoring mandrel body 21 and the casing head shell 10 is realized, and the axial movement of the anchoring mandrel body 21 is limited.
Referring to fig. 4 and 6, the anchoring mandrel body 21 is provided with a plurality of dovetail protrusions 211, the dovetail protrusions 211 extend along the central axis direction of the anchoring mandrel body 21, and the dovetail protrusions 211 are matched with dovetail grooves 231 on the anchoring slips 23. A dovetail connection structure is formed between the dovetail groove 231 and the dovetail projection 211, and a certain gap is formed at the matching position between the dovetail groove 231 and the dovetail projection 211. The dovetail connection structure can prevent the anchoring slips 23 from falling off the anchoring mandrel body 21, and simultaneously allows the anchoring slips 23 to jog in the axial direction and the radial direction of the anchoring mandrel body 21 for anchoring action.
Referring to fig. 4, an auxiliary sealing part 212 is provided on the outer contour of the anchoring mandrel body 21, the auxiliary sealing part 212 is in sealing connection with the anchoring hole part 11, and the auxiliary sealing part 212 is positioned between the main seal 27 and the annular piston body 22; the first end of the pressurizing hole 12 is connected to the cavity between the auxiliary sealing part 212 and the annular piston body 22. When the pressurized medium is injected into the cavity through the pressurizing hole 12, the anchoring mandrel body 21 forms a piston structure as a whole, and the pressurized medium applies downward pressure to the anchoring mandrel body 21, and the downward pressure can improve the contact pressure at the main seal 27, so that the sealing effect of the main seal 27 is further improved. In addition, the seal formed by auxiliary seal 212 and anchoring bore portion 11 of casing head housing 10 also generally improves the sealing performance between anchoring mandrel unit 20 and casing head housing 10.
Specifically, the auxiliary sealing portion 212 may be an annular sealing groove 2121 provided on the outer contour of the anchoring mandrel body 21, and an auxiliary sealing ring 26 (e.g., an O-ring) is provided in the annular sealing groove 2121. Preferably, the annular seal groove 2121 is plural.
Referring to fig. 1, 2, 4 and 7, the upper portion of casing head housing 10 has a flange structure with a top thread hole 14 provided therein. The top thread hole 14 is arranged along the radial direction of the casing head shell 10, the top thread 40 is penetrated in the top thread hole 14, and the top thread 40 is in threaded and sealing connection with the top thread hole 14. The front end of the jackscrew 40 (i.e., the end toward the center of the casing head housing 10) is provided with a tapered tip 41. The outer tip of the slip driver 24 is provided with a driver outer conical surface 245 that mates with the conical top 41. The jackscrew 40, the slip energizer 24 and the anchoring slips 23 are combined into a first manual energizing mechanism. The working principle of the first manual excitation mechanism is as follows: the tail part of the jackscrew 40 (exposed outside the casing head shell 10) is rotated, the conical top 41 at the front end of the jackscrew 40 presses the excited outer conical surface, so that the slip excitation member 24 moves downwards along the axial direction of the anchoring mandrel body 21, and the excited conical surface 241 on the slip excitation member 24 presses the inner conical surface 233 of the anchoring slip 23, so that the anchoring slip 23 moves outwards in the radial direction, and anchoring is realized.
Referring to fig. 4 and 7, the inner top end of the slip excitation member 24 is provided with an excitation member inner taper hole 242, the anchoring mandrel unit 20 further comprises a compression nut plate 25, the compression nut plate 25 is in threaded connection with the top of the anchoring mandrel body 21, a taper part 251 matched with the excitation member inner taper hole 242 is arranged on the outer side of the compression nut plate 25, a plurality of stress application holes 252 are uniformly distributed on the upper top surface of the compression nut plate 25, and the stress application holes 252 can be threaded holes or unthreaded holes. The slip energizer 24 is concentrically connected to the gland nut plate 25 by a second pilot hole 244 therein. The gland nut plate 25, slip energizer 24 and anchoring slips 23 form a second manual energizing mechanism. The working principle of the second manual excitation mechanism is as follows: referring to fig. 9, with the boost hole 252 in the upper surface of the gland nut plate 25, the gland nut plate 25 is rotated using an auxiliary tool (e.g., boost rod 70, bolt, etc., which may be threaded with boost hole 252), the tapered portion 251 of gland nut plate 25 presses against the trigger inner tapered hole 242 in the slip trigger 24, pushing the slip trigger 24 downward, which also may trigger the anchoring slips 23 to effect an anchoring action between the anchoring mandrel unit 20 and the casing head housing 10.
In summary, the hydraulic excitation mechanism is formed on the anchoring sleeve head of the composite driving mandrel, and the first manual excitation mechanism and the second manual excitation mechanism can be formed, so that each excitation mechanism can work independently to realize excitation of the anchoring slips 23, and can be combined according to the field requirement. The casing head can meet the requirement of the suspension of the mandrel suspension device, avoid the pipe column from moving, and increase the stability and the reliability of the casing head.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the invention, but any modifications, equivalents, and simple improvements made within the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A composite drive mandrel anchor casing head, comprising:
the casing head shell (10) is provided with a vertically arranged inner hole, the inner hole is provided with an anchoring hole part (11) and a taper hole part (13), the anchoring hole part (11) is positioned on the upper side of the taper hole part (13), and the anchoring hole part (11) is connected with the large end of the taper hole part (13); the side wall of the casing head shell (10) is also provided with a pressurizing hole (12), a first end of the pressurizing hole (12) is connected with the anchoring hole part (11), and a second end of the pressurizing hole (12) extends to the outer side of the casing head shell (10); a one-way valve (30) is arranged at the second end of the pressurizing hole (12); and
the anchoring mandrel unit (20) comprises an anchoring mandrel body (21), and a slip excitation piece (24), an anchoring slip (23) and an annular piston body (22) which are sequentially sleeved outside the anchoring mandrel body (21) from top to bottom, wherein the anchoring mandrel body (21) can be arranged on the taper hole part (13) in a sitting manner, and a main seal (27) is arranged at the joint of the anchoring mandrel body (21) and the taper hole part (13); the annular piston body (22) can be installed in an annular space between the anchoring mandrel body (21) and the anchoring hole part (11), the inner outline of the annular piston body (22) and the anchoring mandrel body (21) can slide up and down and are in sealing connection, and the outer outline of the annular piston body (22) and the anchoring hole part (11) can slide up and down and are in sealing connection; -a first end of the pressurizing aperture (12) is connected to a cavity between the annular piston body (22) and the main seal (27); the upper end of the annular piston body (22) is propped against the lower end of the anchoring slip (23); the anchoring slips (23) are a plurality of, and the plurality of anchoring slips (23) are distributed around the central axis of the anchoring mandrel body (21); the outer contour of the slip excitation piece (24) is provided with an excitation conical surface (241), and the small end of the excitation conical surface (241) is positioned at the side close to the anchoring slip (23); -the anchoring slips (23) have an inner conical surface (233) matching the excitation conical surface (241), the excitation conical surface (241) being in contact with the inner conical surface (233); the outer side of the anchoring slip (23) is provided with a tooth-shaped surface (232), and the tooth-shaped surface (232) corresponds to the anchoring hole part (11).
2. The composite drive mandrel anchor casing head according to claim 1, wherein the anchor mandrel body (21) is provided with a plurality of dovetail protrusions (211), the dovetail protrusions (211) extend along the central axis direction of the anchor mandrel body (21), and the dovetail protrusions (211) are matched with dovetail grooves (231) on the anchor slips (23).
3. The composite drive mandrel anchoring casing head according to claim 1, characterized in that an auxiliary sealing part (212) is arranged on the outer contour of the anchoring mandrel body (21), the auxiliary sealing part (212) is in sealing connection with the anchoring hole part (11), and the auxiliary sealing part (212) is positioned between the main seal (27) and the annular piston body (22); a first end of the pressurizing hole (12) is connected with a cavity between the auxiliary sealing part (212) and the annular piston body (22).
4. A composite drive mandrel anchor casing head according to claim 3, wherein the auxiliary seal (212) is provided with at least one annular seal groove (2121), and wherein a seal is provided in the annular seal groove (2121).
5. The composite driving mandrel anchoring casing head according to claim 1, wherein a plurality of jackscrews (40) penetrating through the side wall of the casing head shell (10) in the radial direction are uniformly distributed on the casing head shell (10), and the front ends of the jackscrews (40) are provided with conical tops (41); the outer top end of the slip excitation member (24) is provided with an excitation member outer conical surface (245) matched with the conical top (41).
6. The composite drive mandrel anchoring casing head according to claim 1, wherein an inner tip of the slip excitation member (24) is provided with an excitation member inner taper hole (242), the anchoring mandrel unit (20) further comprises a gland nut plate (25), the gland nut plate (25) is screwed with the top of the anchoring mandrel body (21), and a taper part (251) matched with the excitation member inner taper hole (242) is arranged on the outer side of the gland nut plate (25).
7. The composite drive mandrel anchoring casing head according to claim 1, wherein a first pressing groove (221) is arranged outside the lower end of the annular piston body (22), and the first pressing groove (221) is connected with the first end of the pressing hole (12).
8. The composite drive mandrel anchoring casing head according to any one of claims 1 to 7, wherein the main seal (27) comprises a first seal ring (271), a second seal ring (272) and a fastening ring (273), the first seal ring (271) being located on an upper side of the second seal ring (272), the fastening ring (273) being located on a lower side of the second seal ring (272), the fastening ring (273) being in threaded engagement with the anchoring mandrel body (21).
9. The composite drive mandrel anchor casing head of claim 2, wherein the dovetail groove (231) has a gap in cooperation with the dovetail projection (211).
10. The composite drive mandrel anchoring sleeve head according to claim 6, wherein a plurality of force application holes (252) are uniformly distributed on the upper top surface of the compression nut plate (25).
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| CN201910162973.8A CN109736740B (en) | 2019-03-05 | 2019-03-05 | Composite driving mandrel anchoring casing head |
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| CN201910162973.8A CN109736740B (en) | 2019-03-05 | 2019-03-05 | Composite driving mandrel anchoring casing head |
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