CN116291291A - 175MPa three-layer ultrahigh pressure casing head - Google Patents
175MPa three-layer ultrahigh pressure casing head Download PDFInfo
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- CN116291291A CN116291291A CN202310520360.3A CN202310520360A CN116291291A CN 116291291 A CN116291291 A CN 116291291A CN 202310520360 A CN202310520360 A CN 202310520360A CN 116291291 A CN116291291 A CN 116291291A
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- 239000002184 metal Substances 0.000 claims abstract description 103
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 230000005284 excitation Effects 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 16
- 229920001971 elastomer Polymers 0.000 claims description 7
- 238000005553 drilling Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000000452 restraining effect Effects 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to the technical field of petroleum drilling equipment, and particularly provides a 175MPa three-layer ultrahigh pressure casing head which comprises a casing four-way joint and a mandrel hanger, wherein the mandrel hanger comprises an upper mandrel hanger, a middle mandrel hanger and a lower mandrel hanger, the mandrel hanger comprises a hanger body and a top metal seal arranged at the top of the hanger body, the middle metal seal and a lower metal seal are arranged on the outer circular surface of the hanger body, the middle metal seal is deformed downwards by radial jackscrew extrusion force to generate interference for sealing, and the lower metal seal is deformed upwards by axial extrusion force to generate interference for sealing; the cooperation of middle part metal seal and lower metal seal can maintain the holistic sealing performance of hanger body, guarantees to work under the environment of superhigh pressure, can avoid the leakage that the drunkenness caused from top to bottom of hanger body.
Description
Technical Field
The invention relates to the technical field of petroleum drilling equipment, in particular to a 175MPa three-layer ultrahigh pressure casing head.
Background
The wellhead device mainly comprises three parts of a casing head, a tubing head and a christmas tree. The casing head is used for connecting a surface casing, and a plurality of layers of casings in a well are hung through a casing hanger, a sealed annular space is formed by a main seal, an auxiliary seal and a flange backing ring of the casing hanger, and the sealing performance of the main seal, the auxiliary seal and the flange backing ring is detected through a pressure test hole on a wellhead device, so that the safety use of the wellhead device is ensured.
At present, more and more risk exploratory wells such as ultra-deep wells are deployed in China. These wells have the characteristics of deep burial, high pressure coefficient, high single well design yield, high wellhead fluid temperature, etc., even when the well completion depth exceeds 8000 m, the formation pressure exceeds 180MPa, the formation temperature reaches 170 ℃, and the expected well closing pressure exceeds 135 MPa. The highest pressure-bearing 138MPa of the gas production wellhead equipment used in China at present is mainly distributed in the south edge block of the Xinjiang oil field, the front of the Tarim mountain and the northwest block of the southwest oil-gas field, but the wellhead equipment with the pressure-bearing level can not completely meet the production safety requirements of the special wells. Based on the above, the inventor purposefully provides a 175MPa three-layer ultrahigh pressure casing head with simple and ingenious structure and high bearing level.
Disclosure of Invention
The invention aims to provide a 175MPa three-layer ultrahigh-pressure casing head with a simple and ingenious structure and high bearing level, so as to solve the technical problem that wellhead equipment meeting the specified range of an industrial standard API 6A in the prior art cannot completely meet the production safety requirement of a special well.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a 175MPa three-layer super high pressure casing head, its includes sleeve four-way and dabber hanger, the sleeve four-way include by top to bottom arrange in proper order and head and the tail sealing connection's upper strata four-way body, middle level four-way body and lower floor four-way body, also through bolt fixed connection between two adjacent four-way bodies, manual flat valve is installed respectively to the bypass of each four-way body, the top of upper strata four-way body is provided with rather than upper flange that matches to upper flange passes through bolt and upper strata four-way body fixed connection, the top of lower floor four-way body is provided with rather than the sealed supporting chassis that matches, dabber hanger contain upper strata dabber hanger, middle level dabber hanger and lower floor dabber hanger, upper strata dabber hanger, middle level dabber hanger and lower floor dabber hanger respectively with upper strata four-way body, middle level four-way body and lower floor four-way body matching connection, each layer dabber hanger matches and is provided with threaded connection's sleeve pipe, middle part metal seal and lower metal seal on the outer disc of hanger body is hung in the middle part metal seal, and the radial extrusion force metal seal that produces down receives radial interference and produces down and seal down and warp, receives axial upward seal and carries out seal deformation.
As a further optimization or improvement of the solution.
The middle metal seal is coaxially sleeved on the outer circular surface of the hanger body, the bottom of the middle metal seal is in contact with a step formed by the hanger body, a pressing ring sleeved on the hanger body is coaxially arranged above the middle metal seal, a clamping spring sleeved on the hanger body is coaxially arranged above the pressing ring, the clamping spring restrains the pressing ring to be in contact with the middle metal seal in an initial state, the top of the pressing ring is set to be an excitation conical surface I, and the distance between the conical surface I and the axis of the hanger body is gradually reduced from bottom to top.
As a further optimization or improvement of the solution.
The lower metal seal is coaxially sleeved on the outer circular surface of the hanger body, the top of the lower metal seal is in contact with a step formed by the hanger body, a sealing ring retainer sleeved on the hanger body is coaxially arranged below the lower metal seal, a tightening nut which is in threaded connection with the hanger body is coaxially arranged below the sealing ring retainer, the sealing ring retainer is restrained by the tightening nut and is in sealed contact with the lower metal seal, the bottom of the sealing ring retainer is arranged to excite a conical surface II, and the distance between the conical surface II and the axis of the hanger body is gradually increased from bottom to top.
As a further optimization or improvement of the solution.
Annular slot has been seted up at the top of hanger body, be provided with rather than the top metal seal of matching in the slot, the cross-section of top metal seal is rectangular structure and four corner chamfers of this rectangular structure form 23 inclined planes, through screwing up the bolt, make upper flange and upper strata cross body compress tightly/upper strata cross body and middle level cross body compress tightly/upper strata cross body and lower floor cross body compress tightly, compress this top metal seal, make its deformation, the inside and outside both sides 23 inclined planes of top metal seal hug closely the slot on the hanger body and upper flange upper groove, and then produce the interference and realize sealedly.
As a further optimization or improvement of the solution.
The hanger body on be provided with two S type sealing washer, S type sealing washer is located middle part metal seal and lower metal seal.
As a further optimization or improvement of the solution.
The hanger body of the middle-layer mandrel hanger and the upper-layer four-way body are mutually nested and matched, the matched position is provided with secondary seal, and the hanger body of the lower-layer mandrel hanger and the middle-layer four-way body are mutually nested and matched, and the matched position is provided with secondary seal, wherein the secondary seal comprises rubber seal and metal seal.
As a further optimization or improvement of the solution.
The outer circle surface of the hanger body is provided with a raised step, the middle metal seal is arranged at the top of the step, the lower metal seal is arranged at the lower part of the step, and each four-way body is provided with matched jackscrews which are opposite to the conical surface.
As a further optimization or improvement of the solution.
The four-way body is provided with an excitation conical surface, the distance between the excitation conical surface and the axis of the hanger body is gradually increased from bottom to top, and the excitation conical surface is contacted with a conical surface II.
As a further optimization or improvement of the solution.
The hanger body is provided with a sitting and hanging step, the sitting and hanging step is positioned between the S-shaped sealing ring and the lower metal seal, the four-way body is provided with a bearing step matched with the sitting and hanging step, and the sitting and hanging step is matched with the bearing step.
The invention has the beneficial effects that: 1. the core part mandrel type hanger of the 175MPa three-layer ultrahigh-pressure casing head adopts a brand new structure, can guarantee sealing in multiple dimensions, is provided with 3 metal seals and 1 rubber seal group, and excitation positions of each seal are mutually independent and do not interfere with each other; 2. the cooperation of the middle metal seal and the lower metal seal can maintain the integral sealing performance of the hanger body, ensure the operation under the ultra-high pressure environment and avoid the leakage caused by the up-and-down movement of the hanger body; 3. the seating and hanging steps are matched with the bearing steps, so that the lower metal seal cannot be excessively compressed due to the dead weight of the sleeve, and the reliability of the seal is ensured; 4. and each hanger body is in sealing connection with the four-way body adjacent to the upper part, so that the sealing performance of the whole structure is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic view of a partial structure of the present invention.
Fig. 3 is a schematic view of the construction of the spindle hanger.
Fig. 4 is an enlarged view of the structure at a in fig. 3.
Fig. 5 is an enlarged view of the structure at B in fig. 3.
FIG. 6 is an installation view of a pressure test hole and a jackscrew.
The drawing is marked as:
10. a sleeve four-way joint; 11. an upper four-way body; 12. a middle-layer four-way body; 13. a lower four-way body; 14. an upper flange; 15. a bolt; 16. a support chassis; 20. a mandrel hanger; 21. a top metal seal; 22. a groove; 23. an inclined plane; 24a, middle metal seal; 24b, a pressing ring; 24c, clamping springs; 25. s-shaped sealing rings; 26a, exciting a conical surface; 26b, a sitting and hanging step; 27a, lower metal seal; 27b, a sealing ring backing ring; 27c, tightening the nut; 30. secondary sealing; 40. a jackscrew; 50. and a pressure test hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, a 175MPa three-layer ultrahigh pressure casing head comprises a casing four-way 10 and a mandrel hanger 20, wherein the casing four-way 10 comprises an upper-layer four-way body 11, a middle-layer four-way body 12 and a lower-layer four-way body 13 which are sequentially arranged from top to bottom and are in head-to-tail sealing connection, two adjacent four-way bodies are fixedly connected through bolts 15, manual flat valves are respectively installed in bypass of each four-way body, the top of the upper-layer four-way body 11 is provided with an upper flange 14 matched with the upper-layer four-way body 11, the upper flange 14 is fixedly connected with the upper-layer four-way body 11 through bolts 15, the top of the lower-layer four-way body 13 is provided with a sealing supporting chassis 16 matched with the upper-layer four-way body, the mandrel hanger 20 comprises an upper-layer mandrel hanger, a middle-layer mandrel hanger and a lower-layer mandrel hanger, the upper-mandrel hanger, the middle-layer mandrel hanger and the lower-layer mandrel hanger are respectively matched with the upper-layer four-way body 11, the middle-layer four-way body 12 and the lower-layer four-way body 13, the upper-layer four-way body is provided with a casing in threaded connection, the mandrel hanger 20 comprises an interference hanger and an interference metal seal extrusion force 24a is formed at the upper surface and an outer circumference of the lower metal seal 27a, and an axial deformation seal is formed at the middle part is generated, and an axial deformation seal is made, and an axial deformation is made, seal is made, and an axial seal, seal is made, and metal seal, seal is made, and an axial seal deformation is made, and sealing seal is made, and sealing metal seal sealing seal is made.
The principle of ultrahigh pressure sealing is as follows: since the middle metal seal 24a is deformed downwards by the radial extrusion force to generate interference for sealing, and the lower metal seal 27a is deformed upwards by the axial extrusion force to generate interference for sealing, it can be seen that the directions of the excitation deformation of the middle metal seal 24a and the lower metal seal 27a are opposite, when the hanger body moves downwards, the deformation of the lower metal seal 27a is increased, the sealing performance of the middle metal seal 24a is enhanced, when the hanger body moves upwards, the deformation of the middle metal seal 24a is increased, the sealing performance of the lower metal seal 27a is enhanced, the sealing performance of the lower metal seal 27a is reduced, and the whole sealing performance of the hanger body can be maintained through the cooperation of the middle metal seal 24a and the lower metal seal 27a, so that the hanger body can work under the ultra-high pressure environment is ensured.
Specifically, referring to fig. 3 and 5, the middle metal seal 24a is coaxially sleeved on the outer circumferential surface of the hanger body, the bottom of the middle metal seal 24a contacts with a step formed by the hanger body, a pressing ring 24b sleeved on the hanger body is coaxially arranged above the middle metal seal 24a, a clamping spring 24c sleeved on the hanger body is coaxially arranged above the pressing ring 24b, in an initial state, the clamping spring 24c restrains the pressing ring 24b to contact with the middle metal seal 24a, the top of the pressing ring 24b is set to excite a conical surface I, the distance between the conical surface I and the axis of the hanger body is gradually reduced from bottom to top, and the pressing ring 24b moves downwards to press and deform the middle metal seal 24a by pressing the conical surface I so as to realize interference seal.
It should be noted that: as for the specific structure of the snap spring 24c and the matching relationship with the hanger body are all the prior art that can be obtained by those skilled in the art, and the metal seal is not described in detail, and the specific structure is shown in fig. 5, and is not described in a great number of patent, literature and academic papers.
More specifically, the lower metal seal 27a is coaxially sleeved on the outer circular surface of the hanger body, the top of the lower metal seal 27a is in contact with a step formed by the hanger body, a sealing ring retainer 27b sleeved on the hanger body is coaxially arranged below the lower metal seal 27a, a tightening nut 27c which is in threaded connection with the hanger body is coaxially arranged below the sealing ring retainer 27b, the tightening nut 27c is used for restraining the sealing ring retainer 27b to be in contact with the lower metal seal 27a, the bottom of the sealing ring retainer 27b is provided with an excitation conical surface II, the distance between the conical surface II and the axis of the hanger body is gradually increased from bottom to top, and the sealing ring retainer 27b moves upwards to squeeze and deform the lower metal seal 27a to realize interference seal by squeezing the conical surface II.
In order to further improve the sealing performance, an annular groove 22 is formed in the top of the hanger body, a top metal seal 21 matched with the groove 22 is arranged in the groove 22, the cross section of the top metal seal 21 is of a rectangular structure, four corners of the rectangular structure are chamfered to form inclined planes 23 degrees, by screwing the bolts 15, the upper flange 14 is tightly pressed against the upper layer four-way body 11/the upper layer four-way body 11 is tightly pressed against the middle layer four-way body 12/the upper layer four-way body 11 is tightly pressed against the lower layer four-way body 13, the top metal seal 21 is compressed and deformed, and the inclined planes 23 degrees on the inner side and the outer side of the top metal seal 21 are tightly attached to the groove 22 on the hanger body and the groove on the upper flange 14, so that interference is generated, and reliable sealing is formed in the radial direction.
In order to further improve the sealing performance, the hanger body is provided with two S-shaped sealing rings 25, the S-shaped sealing rings 25 are located between the middle metal seal 24a and the lower metal seal 27a, and the S-shaped sealing rings 25 are compressed to deform and further generate interference through tolerance fit between the hanger body and the four-way body, so that reliable sealing is formed in the radial direction. Meanwhile, the S-shaped sealing ring 25 is provided with the metal spring, so that the risk of being scratched can be effectively reduced compared with an O-shaped sealing ring in the installation process, curling in the section direction cannot occur, the S-shaped sealing ring is not easy to squeeze into a groove gap, and sealing is more stable.
It should be noted that: the S-Seal 25 is a prior art available to those skilled in the art, and in particular, the S-Seal is a special Seal designed to meet the high temperature, high pressure, and complex fluid medium conditions currently encountered in the natural petroleum gas industry. With deep oil and gas drilling, the inlet pressure is increased from 5000psi at the initial stage to 20000psi at the current stage, the sealing combination of the traditional rubber elastomer and the retainer ring can only meet the conventional underground pressure and temperature, and the S-Seal adopts a bidirectional anti-extrusion spring design and a one-step molding process, so that the S-Seal has strong anti-extrusion capability, and can play a good sealing effect in wellhead sealing under complex working conditions such as high temperature, high pressure and the like.
Referring to fig. 1, for further improving the sealing performance, the hanger body of the middle-layer mandrel hanger and the upper-layer four-way body 11 are mutually nested and matched, and a secondary seal is arranged at the matched position, the hanger body of the lower-layer mandrel hanger and the middle-layer four-way body 12 are mutually nested and matched, and the matched position is provided with the secondary seal, wherein the secondary seal comprises a rubber seal and a metal seal, and the sealing excitation mode is a conventional excitation mode in the prior art, and the secondary seal is recorded and is not repeated.
Referring to fig. 6, in order to perform extrusion excitation sealing on the first conical surface, the outer circumferential surface of the hanger body is provided with a raised step, the middle metal seal 24a is arranged at the top of the step, the lower metal seal 27a is arranged at the lower part of the step, the four-way bodies are provided with matched jackscrews 40, the jackscrews 40 are arranged opposite to the first conical surface, and by screwing the jackscrews 40 on the four-way bodies, the jackscrews 40 push the pressing ring 24b to move downwards, so that the middle metal seal 24a is compressed, deformed and then interference is generated, and thus reliable sealing is formed in the radial direction.
Referring to fig. 6, in order to squeeze the second conical surface for excitation sealing, the four-way body is provided with an excitation conical surface 26a, the distance between the excitation conical surface 26a and the axis of the hanger body is gradually increased from bottom to top, the excitation conical surface 26a is contacted with the second conical surface, and the second conical surface is squeezed by the excitation conical surface 26a through the self weight of the sleeve, so that the lower metal seal 27a is compressed for deformation, interference is generated, and a reliable seal is formed in the radial direction. Meanwhile, a sitting and hanging step 26b is arranged on the hanger body, the sitting and hanging step 26b is located between the S-shaped sealing ring 25 and the lower metal seal 27a, a receiving step matched with the sitting and hanging step 26b is arranged on the four-way body, the sitting and hanging step 26b is matched with the receiving step, and the sitting and hanging step 26b enables the lower metal seal 27a not to be excessively compressed due to the dead weight of the sleeve.
Referring to fig. 6, the four-way body is further provided with a pressure test hole 50, and the pressure test hole 50 is used for leakage observation or pressure test.
Compared with the prior art, the invention has the advantages that: 1. the core part mandrel type hanger of the 175MPa three-layer ultrahigh-pressure casing head adopts a brand new structure, can guarantee sealing in multiple dimensions, is provided with 3 metal seals and 1 rubber seal group, and excitation positions of each seal are mutually independent and do not interfere with each other; 2. the cooperation of the middle metal seal 24a and the lower metal seal 27a can maintain the overall sealing performance of the hanger body, ensure the operation under the ultra-high pressure environment and avoid the leakage caused by the up-and-down movement of the hanger body; 3. the seating and hanging step 26b is matched with the bearing step, and the seating and hanging step 26b ensures that the lower metal seal 27a cannot be excessively compressed due to the dead weight of the sleeve, so that the reliability of the seal is ensured; 4. and each hanger body is in sealing connection with the four-way body adjacent to the upper part, so that the sealing performance of the whole structure is ensured.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (9)
1. A175 MPa three-layer ultrahigh pressure casing head is characterized in that: the sleeve four-way valve comprises a sleeve four-way valve (10) and a mandrel hanger (20), wherein the sleeve four-way valve (10) comprises an upper four-way body (11), a middle four-way body (12) and a lower four-way body (13) which are sequentially arranged from top to bottom and are in head-to-tail sealing connection, the two adjacent four-way bodies are fixedly connected through bolts (15), manual flat valves are respectively arranged in the bypass of each four-way body, an upper flange (14) matched with the upper four-way body is arranged at the top of the upper four-way body (11), the upper flange (14) is fixedly connected with the upper four-way body (11) through bolts (15), a sealing supporting chassis (16) matched with the upper four-way body is arranged at the top of the lower four-way body (13), the mandrel hanger (20) comprises an upper mandrel hanger, a middle mandrel hanger and a lower mandrel hanger, the upper mandrel hanger and the lower mandrel hanger are respectively connected with the upper four-way body (11), the upper four-way body (12) and the lower mandrel hanger are matched with the lower mandrel hanger, the upper mandrel hanger is provided with an extrusion force of the metal hanger (24 a) which is arranged at the middle of the upper metal hanger (24 a) and is deformed towards the middle part of the sleeve four-way body in a radial direction, the metal hanger (24 a sealing surface is sealed by the metal hanger (24 a sealing surface) and is arranged at the middle part, the lower metal seal (27 a) is deformed upwards by axial extrusion force to generate interference for sealing.
2. A 175MPa three-layer ultrahigh pressure casing head according to claim 1, characterized in that: the middle metal seal (24 a) is coaxially sleeved on the outer circular surface of the hanger body, the bottom of the middle metal seal (24 a) is in contact with a step formed by the hanger body, a pressing ring (24 b) sleeved on the hanger body is coaxially arranged above the middle metal seal (24 a), a clamping spring (24 c) sleeved on the hanger body is coaxially arranged above the pressing ring (24 b), in an initial state, the clamping spring (24 c) restrains the pressing ring (24 b) to be in contact with the middle metal seal (24 a), the top of the pressing ring (24 b) is set to be an excitation conical surface I, and the distance between the conical surface I and the axis of the hanger body is gradually reduced from bottom to top.
3. A 175MPa three-layer ultrahigh pressure casing head according to claim 2, characterized in that: the lower metal seal (27 a) is coaxially sleeved on the outer circular surface of the hanger body, the top of the lower metal seal (27 a) is in contact with a step formed by the hanger body, a sealing ring retainer ring (27 b) sleeved on the hanger body is coaxially arranged below the lower metal seal (27 a), a tightening nut (27 c) which is in threaded connection with the hanger body is coaxially arranged below the sealing ring retainer ring (27 b), the sealing ring retainer ring (27 b) is restrained by the tightening nut (27 c) to be in contact with the lower metal seal (27 a), the bottom of the sealing ring retainer ring (27 b) is provided with an excitation conical surface II, and the distance between the conical surface II and the axis of the hanger body is gradually increased from bottom to top.
4. A 175MPa three-layer ultrahigh-pressure casing head according to claim 3, characterized in that: annular slot (22) have been seted up at the top of hanger body, be provided with in slot (22) rather than the top metal seal (21) of matching, the cross-section of top metal seal (21) is rectangular structure and four corner chamfers of this rectangular structure form inclined plane (23), through screw bolt (15), make upper flange (14) compress tightly with upper strata cross body (11)/upper strata cross body (11) compress tightly with middle level cross body (12)/upper strata cross body (11) and lower floor cross body (13), compress this top metal seal (21), make its deformation, slot (22) on the hanger body and upper flange (14) are hugged closely to top metal seal (21) inside and outside both sides 23 inclined plane (23), and then produce the interference and realize sealing.
5. A 175MPa three-layer ultrahigh-pressure casing head according to claim 4, characterized in that: the hanger body is provided with two S-shaped sealing rings (25), and the S-shaped sealing rings (25) are positioned between the middle metal seal (24 a) and the lower metal seal (27 a).
6. A 175MPa three-layer ultrahigh pressure casing head according to any one of claims 1-5, characterized in that: the hanger body of the middle-layer mandrel hanger is mutually nested and matched with the upper-layer four-way body (11) and the matched position is provided with secondary sealing, and the hanger body of the lower-layer mandrel hanger is mutually nested and matched with the middle-layer four-way body (12) and the matched position is provided with secondary sealing, wherein the secondary sealing comprises rubber sealing and metal sealing.
7. A 175MPa three-layer ultrahigh pressure casing head according to claim 2, characterized in that: the outer circular surface of the hanger body is provided with a raised step, a middle metal seal (24 a) is arranged at the top of the step, a lower metal seal (27 a) is arranged at the lower part of the step, and each four-way body is provided with matched jackscrews (40), and the jackscrews (40) are opposite to the conical surface.
8. A 175MPa three-layer ultrahigh-pressure casing head according to claim 3, characterized in that: the four-way body is provided with an excitation conical surface (26 a), the distance between the excitation conical surface (26 a) and the axis of the hanger body is gradually increased from bottom to top, and the excitation conical surface (26 a) is contacted with a conical surface II.
9. A 175MPa three-layer ultrahigh-pressure casing head according to claim 5, characterized in that: the hanger body is provided with a sitting and hanging step (26 b), the sitting and hanging step (26 b) is positioned between the S-shaped sealing ring (25) and the lower metal seal (27 a), the four-way body is provided with a bearing step matched with the sitting and hanging step (26 b), and the sitting and hanging step (26 b) is mutually matched with the bearing step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310520360.3A CN116291291A (en) | 2023-05-10 | 2023-05-10 | 175MPa three-layer ultrahigh pressure casing head |
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| CN202310520360.3A CN116291291A (en) | 2023-05-10 | 2023-05-10 | 175MPa three-layer ultrahigh pressure casing head |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202788725U (en) * | 2012-09-21 | 2013-03-13 | 江苏扬标石油机械有限公司 | Metal hard sealing oil tube head |
| CN203097772U (en) * | 2012-12-28 | 2013-07-31 | 中国石油天然气股份有限公司 | Ultra-deep well mandrel type sleeve hanging device |
| CN105275423A (en) * | 2014-06-15 | 2016-01-27 | 江苏宏泰石化机械有限公司 | Single-stage casing head with field-replaceable hanger |
| CN108412449A (en) * | 2018-03-10 | 2018-08-17 | 西南石油大学 | A kind of all-metal is multistage and waits the mandrel type hanger of cone sealing structure |
| CN108561097A (en) * | 2018-03-10 | 2018-09-21 | 重庆新泰机械有限责任公司 | A kind of 3U types multistage all-metal sealing mandrel type hanger |
| CN110566152A (en) * | 2019-10-22 | 2019-12-13 | 宝鸡市赛孚石油机械有限公司 | Metal sealing high-pressure pipe cable hanger |
| CN112901106A (en) * | 2021-04-26 | 2021-06-04 | 建湖县鸿达阀门管件有限公司 | High-temperature-resistant high-sulfur-resistant HH-grade three-layer casing head |
| CN113107412A (en) * | 2021-05-16 | 2021-07-13 | 江苏宏泰石化机械有限公司 | Pressure-resistant and corrosion-resistant multistage casing head with interchangeable hangers of different styles |
| CN217501602U (en) * | 2022-05-11 | 2022-09-27 | 盐城金龙达机械制造有限公司 | Novel mandrel type hanger device |
-
2023
- 2023-05-10 CN CN202310520360.3A patent/CN116291291A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202788725U (en) * | 2012-09-21 | 2013-03-13 | 江苏扬标石油机械有限公司 | Metal hard sealing oil tube head |
| CN203097772U (en) * | 2012-12-28 | 2013-07-31 | 中国石油天然气股份有限公司 | Ultra-deep well mandrel type sleeve hanging device |
| CN105275423A (en) * | 2014-06-15 | 2016-01-27 | 江苏宏泰石化机械有限公司 | Single-stage casing head with field-replaceable hanger |
| CN108412449A (en) * | 2018-03-10 | 2018-08-17 | 西南石油大学 | A kind of all-metal is multistage and waits the mandrel type hanger of cone sealing structure |
| CN108561097A (en) * | 2018-03-10 | 2018-09-21 | 重庆新泰机械有限责任公司 | A kind of 3U types multistage all-metal sealing mandrel type hanger |
| CN110566152A (en) * | 2019-10-22 | 2019-12-13 | 宝鸡市赛孚石油机械有限公司 | Metal sealing high-pressure pipe cable hanger |
| CN112901106A (en) * | 2021-04-26 | 2021-06-04 | 建湖县鸿达阀门管件有限公司 | High-temperature-resistant high-sulfur-resistant HH-grade three-layer casing head |
| CN113107412A (en) * | 2021-05-16 | 2021-07-13 | 江苏宏泰石化机械有限公司 | Pressure-resistant and corrosion-resistant multistage casing head with interchangeable hangers of different styles |
| CN217501602U (en) * | 2022-05-11 | 2022-09-27 | 盐城金龙达机械制造有限公司 | Novel mandrel type hanger device |
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