CN209780827U - anchoring casing head of composite driving mandrel - Google Patents

anchoring casing head of composite driving mandrel Download PDF

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Publication number
CN209780827U
CN209780827U CN201920274105.4U CN201920274105U CN209780827U CN 209780827 U CN209780827 U CN 209780827U CN 201920274105 U CN201920274105 U CN 201920274105U CN 209780827 U CN209780827 U CN 209780827U
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CN
China
Prior art keywords
anchoring
mandrel
casing head
slip
hole
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Withdrawn - After Issue
Application number
CN201920274105.4U
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Chinese (zh)
Inventor
薛庆华
李海庆
于广海
程贵华
杨成永
薛帅
王宗雷
宫兆玲
侯祖刚
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Dezhou United Petroleum Polytron Technologies Inc
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Dezhou United Petroleum Polytron Technologies Inc
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Priority to CN201920274105.4U priority Critical patent/CN209780827U/en
Application granted granted Critical
Publication of CN209780827U publication Critical patent/CN209780827U/en
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Abstract

The utility model discloses a composite driving core shaft anchoring casing head, which relates to the technical field of well head devices and comprises a casing head shell and an anchoring core shaft unit, wherein the side wall of the casing head shell is also provided with a pressurizing hole, the first end of the pressurizing hole is connected with the anchoring hole part, and the 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 exciting 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 hanging a mandrel hanger, and after the anchoring of the anchoring mandrel body and the casing head shell, the tubular column can be prevented from moving, and the stability and the reliability of the casing head are improved.

Description

Anchoring casing head of composite driving mandrel
Technical Field
The utility model relates to a well head technical field, concretely relates to compound drive dabber anchoring casing head.
Background
in the use process of the mandrel hanger, due to the reasons of well cementation quality or casing damage and the like, pressure exists in the annular space, 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 which can meet the suspension of a mandrel hanger and simultaneously avoid the movement of a pipe column and increase the stability and reliability of the casing head becomes a technical problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
the utility model discloses above-mentioned technical problem to exist among the prior art provides a compound drive dabber anchoring casing head, and its technical problem that solve lies in this casing head can avoid the tubular column drunkenness when can satisfying hanging of dabber hanger, increases casing head's stability and reliability.
In order to achieve the above technical purpose, an embodiment of the present invention provides a composite drive 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 on the upper side of the taper hole part, and the anchoring hole part is connected with the large end of the taper hole part; a pressurizing hole is further formed in the side wall of the casing head shell, the first end of the pressurizing hole is connected with the anchoring hole part, the second end of the pressurizing hole extends to the outer side of the casing head shell, and a one-way valve is mounted at the second end of the pressurizing hole; and
The anchoring core shaft unit comprises an anchoring core shaft body, and a slip exciting piece, an anchoring slip and an annular piston body which are sequentially sleeved on the outer side of the anchoring core shaft body from top to bottom, wherein the anchoring core shaft body can be seated on the conical hole part, and a main seal is arranged at the joint of the anchoring core shaft body and the conical 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 pressurization hole is connected with a cavity between the annular piston body and the primary seal; the upper end of the annular piston body is abutted against the lower end of the anchoring slip; the anchoring slips are multiple and are distributed around the central axis of the anchoring core shaft body; an excitation conical surface is arranged on the outer contour of the slip excitation piece, and the small end of the excitation conical surface is positioned close to the anchoring slip; the anchoring slips are provided with inner conical surfaces matched with the excitation conical surfaces, and the excitation conical surfaces are contacted with the inner conical surfaces; and a toothed surface is arranged on the outer side of the anchoring slip and corresponds to the anchoring hole part.
Preferably, a plurality of dovetail protrusions are arranged on the anchoring core shaft body, the dovetail protrusions extend along the central axis direction of the anchoring core shaft 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 anchor core shaft body, the auxiliary sealing part is in sealing connection with the anchor hole part, and the auxiliary sealing part is positioned between the primary 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, the auxiliary sealing part is provided with at least one annular sealing groove, and a sealing element is arranged in the annular sealing groove.
Preferably, a plurality of jackscrews which radially penetrate through the side wall of the casing head casing are uniformly distributed on the casing head casing, and the front ends of the jackscrews are provided with conical tops; and the top end of the outer side of the slip excitation piece is provided with an excitation piece outer conical surface matched with the conical top.
Preferably, an exciting part inner taper hole is formed in the top end of the inner side of the slip exciting part, the anchoring mandrel unit further comprises a pressing nut plate, the pressing nut plate is in threaded connection with the top of the anchoring mandrel body, and a tapered portion matched with the exciting part inner taper hole is formed in the outer side of the pressing nut plate.
preferably, a first pressure groove is formed in the outer side of the lower end of the annular piston body, and the first pressure groove is connected with the first end of the pressurizing hole.
Preferably, the main seal includes a first seal ring, a second seal ring, and a fastening ring, the first seal ring is located on an upper side of the second seal ring, the fastening ring is located on a lower side of the second seal ring, and the fastening ring is screwed with the anchoring mandrel body.
Preferably, the dovetail groove is provided with a gap at the matching part of the dovetail groove and the dovetail bulge.
Preferably, a plurality of force application holes are uniformly distributed on the upper top surface of the pressing nut plate.
The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least: a composite drive mandrel anchoring casing head includes a casing head housing and an anchoring mandrel unit seated within the casing head housing. The casing head can meet the requirement of hanging a mandrel hanger, avoids pipe column movement, and increases the stability and reliability of the casing head.
Further, the casing head housing has a vertically disposed bore having an anchor bore portion and a countersink portion. The taper hole part provides the holding power for anchoring mandrel unit on the one hand, and on the other hand sealing connection between taper hole part and the anchoring mandrel unit realizes the sealing of sleeve annular space.
Further, an annular piston body, an anchoring slip and a slip exciting element are combined to form a hydraulic exciting mechanism, the annular piston body can be installed 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 be connected in a vertically sliding and sealing mode, the outer contour of the annular piston body and the anchoring hole part can be connected in a vertically sliding and sealing mode, 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-bearing medium is injected into the cavity through the pressurizing hole, the lower end of the cavity is sealed, and the pressure-bearing medium can push the annular piston body to move upwards. The upper end of the annular piston body is abutted against the lower end of the anchoring slip, force is transmitted 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 outwards pushing force of the exciting conical surface in the process of moving upwards. And a toothed surface is arranged on the outer side of the anchoring slip and corresponds to the anchoring hole part. The tooth-shaped surface is meshed and contacted with the anchoring hole part, so that the anchoring of the anchoring core shaft body and the casing head shell is realized.
Still further, a dovetail connection structure is formed between the dovetail groove and the dovetail protrusion, and a certain gap is formed at the matching position between the dovetail groove and the dovetail protrusion. The dovetail connection structure can prevent the anchoring slips from falling off from the anchoring core shaft body, and on the other hand, the dovetail connection structure also allows the anchoring slips to slightly move in the axial direction and the radial direction of the anchoring core shaft body to perform anchoring action.
Still further, when the pressure-bearing medium is injected into the cavity through the pressurizing hole, the anchoring mandrel body integrally forms a piston structure, the pressure-bearing medium applies downward pressure to the anchoring mandrel body, and the downward pressure can improve the contact pressure of the main seal part, so that the sealing effect of the main seal is further improved. In addition, the seal formed by the auxiliary seal portion and the anchor hole portion of the casing head housing also improves the sealing performance between the anchor mandrel unit and the casing head housing as a whole.
Still further, the jackscrew, slip activation and anchoring slips are combined into a first manually activated mechanism. The tail part of the jackscrew is rotated, the conical top at the front end of the jackscrew is extruded to excite the outer conical surface, so that the anchor slips are excited to move downwards along the axial direction of the anchor core shaft body, and the excitation conical surface on the slips excitation part extrudes the inner conical surface of the anchor slips to enable the anchor slips to move outwards in the radial direction, thereby realizing anchoring.
Still further, the pressing nut disc, the slip excitation piece and the anchoring slip form a second manual excitation mechanism, the pressing nut disc can be rotated by using an auxiliary tool (such as a force application rod, a bolt and the like) through a force application hole in the pressing nut disc, an excitation piece inner cone hole in the slip excitation piece is extruded by a conical part of the pressing nut disc to push the slip excitation piece to move downwards, and the anchoring slip can be excited by the fact that the slip excitation piece moves downwards to realize anchoring between the anchoring mandrel unit and the casing head shell.
To sum up, the utility model discloses a compound drive dabber anchoring sleeve overhead has formed hydraulic pressure excitation mechanism, can also form first manual excitation mechanism and the manual excitation mechanism of second, and each excitation mechanism both can work alone and realize the excitation of anchoring slips, also can make up the use according to the on-the-spot needs. The casing head can meet the requirement of hanging a mandrel hanger, and after the anchoring of the anchoring mandrel body and the casing head shell, the tubular column can be prevented from moving, and the stability and the reliability of the casing head are improved.
Drawings
Fig. 1 is a schematic structural view of a composite drive mandrel anchoring casing head according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a casing head housing in the composite drive mandrel anchoring casing head according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an anchoring mandrel unit in a composite drive mandrel anchoring casing head according to an embodiment of the present invention (hatching omitted for ease of viewing);
FIG. 4 is a partial enlarged view A of FIG. 3;
FIG. 5 is a schematic view of the construction of the annular piston body in the composite drive mandrel anchor casing head according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view B-B of FIG. 3;
Fig. 7 is a schematic structural view of a slip actuator in a composite drive mandrel anchoring casing head according to an embodiment of the present invention;
FIG. 8 is a top view of a compression nut plate in a composite drive mandrel anchoring bushing head in accordance with an embodiment of the present invention;
Fig. 9 is a schematic diagram illustrating the operational principle of a gland nut plate of a composite drive mandrel anchoring bushing head in accordance with an embodiment of the present invention;
Fig. 10 is a schematic diagram illustrating the main seal of the composite drive mandrel anchor casing head according to an embodiment of the present invention.
in the figure, the position of the upper end of the main shaft,
10-casing head housing, 11-anchoring hole portion, 12-pressurizing hole, 13-taper hole portion, 14-jackscrew hole;
20-an anchoring mandrel unit, the anchoring mandrel unit,
21-anchoring core shaft body, 211-dovetail projection, 212-auxiliary sealing part, 2121-annular sealing groove, 213-second pressure applying groove,
22-annular piston body, 221-first pressure groove, 222-outer sealing slide face, 223-inner sealing slide face,
23-anchoring slips, 231-dovetail grooves, 232-toothed surfaces, 233-internal conical surfaces,
24-a slip inducing member, 241-an inducing taper, 242-an inner inducing bore of the inducing member, 243-a first pilot bore, 244-a second pilot bore, 245-an outer taper of the inducing member,
25-a compression nut disc, 251-a conical part, 252-a force application hole, 26-an auxiliary sealing ring, 27-a main seal, 271-a first sealing ring, 272-a second sealing ring, 273-a fastening ring, 274-a third sealing ring, 275-a fourth sealing ring, 28-a double male nipple;
30-a one-way valve;
40-top thread, 41-conical top;
50-wellhead valve, 60-pressure measuring part and 70-stress rod.
Detailed Description
The invention will be explained and explained in detail with reference to the drawings attached to the specification.
referring to fig. 1, a composite driving mandrel anchoring casing head includes a casing head housing 10 and an anchoring mandrel unit 20, the anchoring mandrel unit 20 is seated in the casing head housing 10 and anchored with the casing head housing 10, which can satisfy the suspension of a mandrel hanger, avoid the movement of a pipe string, and increase the stability and reliability of the casing head.
generally, the outside of the casing head housing 10 may also mount a plurality of wellhead valves 50 and pressure gauges 60. The wellhead valve 50 may be, for example, a flat plate valve; the pressure measuring member 60 may be, for example, a pressure gauge.
Referring to FIG. 2, the casing head housing 10 has a vertically disposed bore having an anchor bore portion 11 and a countersink portion 13. The taper hole part 13 provides a 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 sealing of the casing annulus is realized.
the anchor hole portion 11 is located above the taper hole portion 13, and the anchor hole portion 11 is connected to the large end of the taper hole portion 13. In the present embodiment, the inner bore diameter of the anchor bore portion 11 is the same as the large end diameter of the taper bore portion 13, but it should be understood that the inner bore diameter of the anchor bore portion 11 may be larger than the large end diameter of the taper bore portion 13, and is not particularly limited herein. Alternatively, the anchor hole portion 11 and the taper hole portion 13 may be directly connected or indirectly connected by another structure.
The sidewall of the casing head housing 10 is further provided with a pressurization hole 12, a first end of the pressurization hole 12 is connected with the anchoring hole part 11, and a second end of the pressurization hole 12 extends to the outside of the casing head housing 10. In the present embodiment, the pressurizing holes 12 are arranged in a radial direction of the casing head housing 10, or are arranged horizontally, and besides, the pressurizing holes 12 may be arranged obliquely as needed.
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 a pressure medium (e.g., hydraulic oil, water, etc.) when the pressure medium is injected into the interior of the casing head housing 10 through the pressurizing hole 12. Further, it should be understood that the one-way valve 30 may be integrated into the pressurized bore 12 or the one-way 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, and a slip exciting member 24, an anchoring slip 23 and an annular piston body 22 sequentially sleeved outside the anchoring mandrel body 21 from top to bottom. The lower end of the anchor mandrel body 21 may be connected to a double male sub 28, the double male sub 28 being used to connect to a tubular string (e.g. a surface casing).
The anchor mandrel body 21 can be seated in the countersink 13 and a primary seal 27 is provided at the connection of the anchor mandrel body 21 and the countersink 13. Preferably, referring to fig. 3, the main seal 27 includes 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 first seal ring 271 being interposed between the second seal ring 272 and the anchoring mandrel body 21. The fastening ring 273 is located below the second seal ring 272, and the fastening ring 273 is screwed to the anchor mandrel body 21 to fix the second seal ring 272 and the first seal ring 271 to the anchor mandrel body 21. The outer side of the lower end of the second sealing ring 272 is provided with a chamfer structure matching with the conical part 251 of the casing head housing 10. In this embodiment, the first sealing ring 271 is preferably made of a flexible material (e.g., rubber), and the second sealing ring 272 is preferably made of a metal material.
it should be understood that there are a number of options for the construction of the primary seal 27. Referring to fig. 10, the following structure is also possible: the main seal 27 includes 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 anchor mandrel body 21 from top to bottom, wherein the fourth seal ring 275 preferably has a rectangular cross section and is made of a flexible material (e.g., highly saturated hydrogenated nitrile); 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 (for example, 304SS or 316 SS). In this embodiment, the cross sections of the third seal ring 274 and the first seal ring 271 are both provided with trapezoidal structures protruding toward the second seal ring 272, and the cross section of the second seal ring 272 is provided with trapezoidal grooves for accommodating the trapezoidal structures. When the anchor mandrel body 21 is loaded, the third seal ring 274 and the first seal ring 271 press the second seal ring 272 to deform radially outwardly, thereby forming a sealed connection with the casing head housing 10.
The annular piston body 22 can be installed in the annular space between the anchor spindle body 21 and the anchor hole portion 11, and the inner contour (refer to the inner sealing slide surface 223 in fig. 5) of the annular piston body 22 and the anchor spindle body 21 can be slidably and sealingly connected up and down, the outer contour (refer to the outer sealing slide surface 222 in fig. 5) of the annular piston body 22 and the anchor hole portion 11 can be slidably and sealingly connected up and down, and the first end of the pressurizing hole 12 is connected to the cavity between the annular piston body 22 and the primary seal 27. When pressure-bearing medium is injected into the cavity through the pressurizing hole 12, the lower end of the cavity is sealed, and the pressure-bearing medium can push the annular piston body 22 to move upwards. The outer contour of the annular piston body 22 is provided with an annular groove, in which a sealing element (e.g., an O-ring rubber seal, etc.) can be installed, so that the outer contour of the annular piston body 22 is in a sealed and slidable connection with the anchoring hole portion 11 of the casing head housing 10. In this embodiment, a groove for installing a sealing member is also provided on the outer surface of the anchoring mandrel body 21 corresponding to the inner surface of the annular piston body 22, so that a sealed 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 seal ring may be provided on the opposite surface, for example, the groove for mounting the seal 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 anchor mandrel body 21.
referring to fig. 4 and 5, the lower end outer side of the annular piston body 22 is provided with a first pressing groove 221. The first pressurizing groove 221 is connected to a first end of the pressurizing hole 12. Further preferably, a second pressing groove 213 may be further provided on the anchor mandrel body 21 at a position adjacent to the first pressing groove 221. The first pressing groove 221 and the second pressing groove 213 form an annular cavity for facilitating injection of the pressure-bearing 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 routed around the central axis of the anchoring mandrel body 21. Of course, other numbers of anchoring slips 23 may be provided, such as 3 or 5 or 6.
Referring to fig. 4 and 7, the outer profile of the slip activation member 24 is provided with an activation cone 241, the small end of the activation cone 241 being located on the side closer to the anchoring slips 23. Anchoring slip 23 has an inner tapered surface 233 that matches excitation tapered surface 241, excitation tapered surface 241 being in contact with inner tapered surface 233. The slip activation member 24 is concentrically coupled to the anchor mandrel body 21 through the first guide hole 243 such that the slip activation member 24 can move along a central axis direction of the anchor mandrel body.
the annular piston body 22, anchoring slips 23 and slip activation member 24 combine to form a hydraulic activation mechanism. The working principle of the hydraulic excitation mechanism is as follows: when the pressure medium is injected into the first pressure applying groove 221 and/or the second pressure applying groove 213 through the pressure hole 12, the pressure medium pushes the annular piston body 22 to move upward. The upper end of the annular piston body 22 abuts against the lower end of the anchoring slip 23, transmitting force to the anchoring slip 23, and pushing the anchoring slip 23 to move upwards. The anchoring slips 23 are also gradually moved radially outward as they are pushed by the energizing cone 241 during upward movement. The outer side of the anchoring slip 23 is provided with a toothed surface 232, and the toothed surface 232 corresponds to the anchoring hole portion 11. The tooth surface 232 is anchored with the anchoring hole portion 11, so that the anchoring of the anchoring core shaft body 21 and the casing head shell 10 is realized, and the function of limiting the axial line movement of the anchoring core shaft body 21 is achieved.
Referring to fig. 4 and 6, a plurality of dovetail protrusions 211 are provided on the anchor core shaft body 21, the dovetail protrusions 211 extend along the central axis direction of the anchor core shaft body 21, and the dovetail protrusions 211 are matched with the dovetail grooves 231 on the anchor slips 23. A dovetail connection structure is formed between the dovetail groove 231 and the dovetail protrusion 211, and a certain gap is formed at the matching position between the dovetail groove 231 and the dovetail protrusion 211. The dovetail connection arrangement prevents the anchoring slips 23 from falling off the anchoring mandrel body 21, while also allowing the anchoring slips 23 to jog in the axial and radial directions of the anchoring mandrel body 21 for the anchoring action.
Referring to fig. 4, the outer contour of the anchor mandrel body 21 is provided with a secondary seal portion 212, the secondary seal portion 212 is connected with the anchor hole portion 11 in a sealing manner, and the secondary seal portion 212 is located between the primary seal 27 and the annular piston body 22; the first end of the pressurizing hole 12 is connected with the cavity between the secondary seal 212 and the annular piston body 22. When the pressure medium is injected into the cavity through the pressurizing hole 12, the anchor mandrel body 21 forms a piston structure as a whole, and the pressure medium applies a downward pressure to the anchor 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 the auxiliary seal portion 212 and the anchoring hole portion 11 of the casing head housing 10 also improves the sealing performance between the anchoring mandrel unit 20 and the casing head housing 10 as a whole.
Specifically, the auxiliary seal portion 212 may be an annular seal groove 2121 disposed on the outer contour of the anchor spindle body 21, and an auxiliary seal ring 26 (e.g., an O-ring rubber seal) is disposed in the annular seal groove 2121. Preferably, the annular sealing groove 2121 is plural.
Referring to fig. 1, 2, 4 and 7, the upper portion of the casing head housing 10 has a flange structure where a bolt hole 14 is provided. The setting direction of the jackscrew hole 14 is along the radial direction of the casing head shell 10, the jackscrew 40 is arranged in the jackscrew hole 14 in a penetrating way, and the jackscrew 40 is in threaded and sealing connection with the jackscrew hole 14. The front end of the jackscrew 40 (i.e., the end facing the center of the casing head housing 10) is provided with a tapered tip 41. The outside top of the slip activation piece 24 is provided with an activation piece outer cone 245 matching the cone top 41. The jackscrew 40, slip activation 24 and anchoring slips 23 combine to form a first manually activated mechanism. The working principle of the first manual excitation mechanism is as follows: when the tail portion of the jackscrew 40 is rotated (exposed outside the casing head housing 10), the tapered top portion 41 at the front end of the jackscrew 40 extrudes and excites the outer conical surface, so that the slip exciting member 24 moves downward along the axial direction of the anchoring mandrel body 21, and the exciting conical surface 241 on the slip exciting member 24 extrudes and excites the inner conical surface 233 of the anchoring slip 23, so that the anchoring slip 23 moves radially outward, thereby realizing anchoring.
referring to fig. 4 and 7, an excitation member inner taper hole 242 is formed at the top end of the inside of the slip excitation member 24, the anchoring mandrel unit 20 further includes a gland nut plate 25, the gland nut plate 25 is screwed with the top of the anchoring mandrel body 21, a tapered portion 251 matched with the excitation member inner taper hole 242 is formed at the outside of the gland nut plate 25, a plurality of force applying holes 252 are uniformly distributed on the top surface of the gland nut plate 25, and the force applying holes 252 may be threaded holes or unthreaded holes. The slip activation member 24 is concentrically coupled to the hold-down nut plate 25 through a second pilot hole 244 in the slip activation member. The hold-down nut plate 25, slip activation member 24 and anchoring slip 23 form a second manual activation mechanism. The working principle of the second manual excitation mechanism is as follows: referring to fig. 9, by using the force application hole 252 on the top surface of the hold-down nut plate 25, and by using an auxiliary tool (such as the force application rod 70, a bolt, etc., which may be screwed into the force application hole 252), the tapered portion 251 of the hold-down nut plate 25 presses the inner cone hole 242 of the activating member on the slip activating member 24, thereby pushing the slip activating member 24 to move downward, and the downward movement of the slip activating member 24 may also activate the anchoring slips 23 to perform the anchoring action between the anchoring mandrel unit 20 and the casing head housing 10.
To sum up, the utility model discloses a compound drive dabber anchoring sleeve overhead has formed hydraulic pressure excitation mechanism, can also form first manual excitation mechanism and the manual excitation mechanism of second, and each excitation mechanism both can work alone and realize the excitation of anchoring slips 23, also can make up the use according to the on-the-spot needs. The casing head can meet the requirement of hanging a mandrel hanger, avoids pipe column movement, and increases the stability and reliability of the casing head.
the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, and simple improvements made in the spirit of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A composite drive mandrel anchoring 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 conical hole part (13), the anchoring hole part (11) is positioned on the upper side of the conical hole part (13), and the anchoring hole part (11) is connected with the large end of the conical hole part (13); a pressurizing hole (12) is further formed in the side wall of the casing head shell (10), 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 exciting piece (24), an anchoring slip (23) and an annular piston body (22) which are sequentially sleeved on the outer side of the anchoring mandrel body (21) from top to bottom, wherein the anchoring mandrel body (21) can be seated on the conical hole part (13), and a main seal (27) is arranged at the joint of the anchoring mandrel body (21) and the conical hole part (13); the annular piston body (22) can be installed in an annular space between the anchoring core shaft body (21) and the anchoring hole part (11), the inner contour of the annular piston body (22) and the anchoring core shaft body (21) can slide up and down and are in sealing connection, and the outer contour 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 pressurization bore (12) is connected to the cavity between the annular piston body (22) and the primary seal (27); the upper end of the annular piston body (22) is abutted against the lower end of the anchoring slip (23); the anchoring slips (23) are multiple, and the anchoring slips (23) are distributed around the central axis of the anchoring core shaft 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 close to the anchoring slip (23); the anchoring slips (23) have inner tapered surfaces (233) matching the energizing tapered surfaces (241), the energizing tapered surfaces (241) being in contact with the inner tapered surfaces (233); the outer side of the anchoring slip (23) is provided with a toothed surface (232), and the toothed surface (232) corresponds to the anchoring hole part (11).
2. The composite drive mandrel anchor bushing head according to claim 1, wherein a plurality of dovetail protrusions (211) are provided on the anchor mandrel body (21), the dovetail protrusions (211) extend along a 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 anchor sleeve head as claimed in claim 1, characterized in that a secondary seal (212) is provided on the outer contour of the anchor mandrel body (21), said secondary seal (212) being in sealing connection with the anchor bore portion (11), said secondary seal (212) being located between the primary seal (27) and the annular piston body (22); a first end of the pressurization bore (12) is connected to the cavity between the secondary seal (212) and the annular piston body (22).
4. The composite drive mandrel anchor casing head according to claim 3 wherein the secondary seal (212) is provided with at least one annular seal groove (2121) with a seal disposed therein (2121).
5. the composite drive mandrel anchoring casing head according to claim 1, characterized in that a plurality of jackscrews (40) radially penetrating the casing head casing (10) side wall are uniformly distributed on the casing head casing (10), the front ends of the jackscrews (40) are provided with tapered tops (41); and the top end of the outer side of the slip excitation piece (24) is provided with an excitation piece outer conical surface (245) matched with the conical top part (41).
6. the composite drive mandrel anchoring casing head of claim 1 wherein the slip actuator (24) is provided with an actuator bore (242) at the top inside thereof, the anchoring mandrel unit (20) further comprising a gland nut plate (25), the gland nut plate (25) being threadably engaged with the top of the anchoring mandrel body (21), the gland nut plate (25) being provided on the outside thereof with a tapered portion (251) matching the actuator bore (242).
7. The composite drive mandrel anchoring bushing head according to claim 1, characterized in that the lower end of the annular piston body (22) is provided with a first pressure groove (221) on the outside, the first pressure groove (221) being connected with the first end of the pressure hole (12).
8. The composite drive mandrel anchoring casing head according to any one of claims 1 to 7, characterized in that the primary seal (27) comprises a first sealing ring (271), a second sealing ring (272) and a fastening ring (273), the first sealing ring (271) being located on the upper side of the second sealing ring (272), the fastening ring (273) being located on the lower side of the second sealing ring (272), the fastening ring (273) being in threaded connection with the anchoring mandrel body (21).
9. The composite drive mandrel anchor sleeve head of claim 2 wherein the mating of the dovetail slots (231) with the dovetail protrusions (211) has a gap.
10. The composite drive mandrel anchoring bushing head of claim 6 wherein the upper top surface of the compression nut plate (25) is uniformly distributed with a plurality of force application holes (252).
CN201920274105.4U 2019-03-05 2019-03-05 anchoring casing head of composite driving mandrel Withdrawn - After Issue CN209780827U (en)

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