CN107013177B - Wellhead hanger for heating pipe cable - Google Patents
Wellhead hanger for heating pipe cable Download PDFInfo
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- CN107013177B CN107013177B CN201710324736.8A CN201710324736A CN107013177B CN 107013177 B CN107013177 B CN 107013177B CN 201710324736 A CN201710324736 A CN 201710324736A CN 107013177 B CN107013177 B CN 107013177B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 92
- 239000000725 suspension Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims description 42
- 229910052751 metal Inorganic materials 0.000 claims description 42
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 239000003921 oil Substances 0.000 description 14
- 239000010779 crude oil Substances 0.000 description 10
- 239000001993 wax Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000003129 oil well Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 210000003954 umbilical cord Anatomy 0.000 description 1
Images
Classifications
-
- 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
- E21B33/0407—Casing heads; Suspending casings or tubings in well heads with a suspended electrical cable
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gasket Seals (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention relates to a wellhead hanger of a heating pipe cable, which comprises a top sealing assembly, a hanging assembly, a mandrel sealing assembly, a bottom sealing assembly and a bypass assembly, wherein the top sealing assembly, the hanging assembly, the mandrel sealing assembly and the bottom sealing assembly form a cavity which is communicated up and down through a shell, and the heating pipe cable is hung in the cavity through the hanging assembly; the bypass assembly is laterally arranged on the suspension assembly, the cable rod penetrates through the bypass assembly and extends into the cavity, and the cable rod is connected with a cable core of the heating pipe cable through the suspension assembly. According to the bypass assembly of the wellhead hanger, the traditional two-way wellhead hanger is changed into the three-way wellhead hanger, and the cable rod penetrates through the bypass assembly, so that the problem of electrifying and heating the heating pipe cable is solved.
Description
Technical Field
The invention relates to a wellhead hanger for a heating pipe cable, which is suitable for the technical field of petroleum engineering.
Background
The wax deposition of oil well is a long existing problem in the oil field development process, when crude oil is pumped from underground to the ground, the temperature of the crude oil is gradually reduced due to the escape and expansion of dissolved gas, wax is crystallized and separated from the crude oil according to the size of molecular weight and then deposited on the inner wall of an oil pipe, so that a shaft becomes narrow, the yield of the oil well is reduced, and the oil pipe is blocked to stop the production of the oil well in severe cases. The wax solubility of crude oil decreases with decreasing temperature, and when the temperature decreases to a value where the wax solubility of crude oil is less than the wax content of crude oil, the dissolved wax in crude oil begins to precipitate. The ultrasonic technology used in oil extraction in oil field at present mainly uses the sound energy of ultrasonic wave to break the macromolecule chain of crude oil and paraffin wax, so that it is changed into low molecular chain, and its fluidity is raised, so that one part of the electric energy used by it is converted into sound energy, another part is converted into heat energy, and the part converted into heat energy is wasted. The ultrasonic electric heating paraffin removal device utilizes the sound energy converted by the electric energy and the heat energy released by the electric energy in the transmission process, thereby comprehensively utilizing the energy. The applicant's prior application 201710122007.4 provides a medium-frequency induction heating pipe cable and a preparation method thereof, wherein a coiled tubing is changed into a heat carrier by utilizing the induction heating principle to form the heating pipe cable, natural gas or crude oil flowing through the oil pipe and the annular space of the pipe cable is heated, and the effects of eliminating wax deposition and the like are achieved.
A tubing hanger is a device that supports a tubing string and seals the annular space between the tubing and the casing. The sealing mode of the oil pipe hanger is that the oil pipe hanger is connected with an oil pipe and is seated in a cone by gravity for sealing, so that the operation is convenient, the well head changing speed is high, and the sealing mode is safe, thereby being a mode commonly used by medium-deep wells and conventional wells. The hanger has the following functions: and suspending an oil pipe column in the well, sealing an annular space between the oil pipe and the casing, providing transition for connecting a lower casing joint and an upper Christmas tree, and the like.
Chinese patent applications 201410629076.0, 201520866618.6 and 201420667666.8 disclose three different coiled tubing hangers, respectively, wherein the interior of each hanger is straight-through since the problem of heating the internal umbilical of the coiled tubing is not involved. In addition, the one-way sealing element is adopted between the oil pipe and the shell for sealing, and the sealing effect is poor.
The wellhead hanger which has better sealing performance and is suitable for the heating pipe cable is lacked in the prior art.
Disclosure of Invention
The invention provides a wellhead hanger of a heating pipe cable, aiming at solving the defects in the prior art, and the wellhead hanger comprises a top sealing assembly, a hanging assembly, a mandrel sealing assembly, a bottom sealing assembly and a bypass assembly, wherein the top sealing assembly, the hanging assembly, the mandrel sealing assembly and the bottom sealing assembly are enclosed into a cavity which is communicated up and down through respective shells, and the heating pipe cable is hung in the cavity through the hanging assembly; the bypass assembly is laterally mounted on the suspension assembly, and the cable rod penetrates through the bypass assembly, extends into the cavity and is connected with the cable core of the heating cable.
Preferably, the lowermost end of the wellhead hanger is provided with a blind flange, the blind flange is fixed on a flange seat through a bolt, a sealing element is arranged between the blind flange and the flange seat, and the blind flange and the flange seat are respectively provided with a pressure applying port and a pressure channel inside. One end of the pressure channel is communicated with the pressure applying port, and the other end of the pressure channel is communicated with a cavity inside the wellhead hanger.
Preferably, a metal sealing ring is further arranged in a cavity at the lower part of the mandrel, and the bottom end of the metal sealing ring is in contact sealing with the inside of the shell; the bottom end of the metal sealing ring is in contact sealing with the inner conical surface of the shell; the trapezoidal inclined plane at the lower end of the mandrel is matched with the sharp-angled inclined plane at the upper end of the metal sealing ring, so that the metal sealing ring is respectively sealed with the shell and the continuous oil pipe in a two-way mode.
Preferably, the mandrel comprises an upper mandrel and a lower mandrel which are connected in a threaded manner, a metal sealing ring is further arranged in a lower cavity of the lower mandrel, and the bottom end of the metal sealing ring is in contact sealing with the inner conical surface of the shell; the lower end of the lower mandrel is in an inverted trapezoid shape, and the upper end of the metal sealing ring is in a sharp-angled shape with a step part; the trapezoidal inclined plane of the lower end of the lower mandrel is matched with the sharp-angled inclined plane of the upper end of the metal sealing ring and can slide relatively, and the trapezoidal bottom surface of the lower end of the lower mandrel is matched with the step part of the metal sealing ring, so that the metal sealing ring is respectively sealed with the shell and the coiled tubing in two directions.
Preferably, a jackscrew is arranged above the metal sealing ring, the jackscrew extends into the cavity along the opening on the shell, the inner end part of the jackscrew inserted into the cavity is conical, and a pushing inclined plane is arranged on the mandrel at the corresponding position, so that the conical end part of the jackscrew can be matched with the pushing inclined plane.
Preferably, the mandrel is connected with a clamping assembly, and the clamping assembly comprises a clamping arm and an upper slip and a lower slip which are arranged in the clamping arm; the inner walls of the upper slip and the lower slip are provided with clamping lines and form a bidirectional suspension structure.
Preferably, the upper mandrel is connected with an upper clamping assembly, and the upper clamping assembly comprises an upper clamping arm and an upper slip arranged in the upper clamping arm; the lower mandrel is connected with a lower clamping assembly, and the lower clamping assembly comprises a lower clamping arm and a lower slip arranged in the lower clamping arm; the inner walls of the upper slip and the lower slip are provided with clamping grains and are separated by a separator; a bidirectional suspension structure is formed between the upper mandrel and the lower mandrel.
Preferably, the upper end of the mandrel is in threaded connection with the suspension cylinder, the upper end of the suspension cylinder is provided with the fishing cylinder, and the inside of the suspension cylinder is provided with the metal sheath; the cable core and the metal sheath are connected by a pressing wire;
an insulating sheath is arranged between the suspension cylinder and the metal sheath, a first insulating sealing element is arranged at the lower part of the insulating sheath, and the shape of the first insulating sealing element is configured to seal the gap between the lower part of the insulating sheath and the suspension cylinder and the gap between the suspension cylinder and the core sleeve; the lower portion of the first insulating seal is spaced from the core sleeve and filled with a second insulating seal.
Preferably, the bypass assembly comprises a female flange, a drawing system, a pressurizing valve and a sub-flange, wherein the female flange is fixed on a shell of the wellhead hanger through bolts, and the sub-flange is fixed on the female flange through bolts;
the drawing system comprises a drawing body, a drawing piece, a clamping piece and an elastic sealing piece, wherein a cavity is formed between the sub-flange and the drawing body, an insulating sealing assembly surrounding the cable rod is arranged in the cavity, and the drawing piece penetrates through an end opening of the drawing body and is in abutting contact with the insulating sealing assembly; an insulating sealing part is arranged between the drawing part and the cable rod, and a clamping fastener is arranged between the insulating sealing part and the cable rod;
set up the pressure valve in the outside of sub-flange, sub-flange with draw the cavity and the pressure valve intercommunication between the body.
Preferably, the top sealing assembly comprises a flat valve, a top flange seat, a top blind flange, a pressure-resistant valve and a pressure gauge, a top pressure channel is arranged in the middle of the top blind flange, one end of the top pressure channel is communicated with an inner cavity of the flat valve, and the other end of the top pressure channel is connected with the pressure-resistant valve and the pressure gauge through a three-way pipe respectively.
According to the bypass assembly of the wellhead hanger, the traditional two-way wellhead hanger is changed into the three-way wellhead hanger, and the cable rod penetrates through the bypass assembly, so that the problem of heating the heating pipe cable in an electrified mode is solved. Meanwhile, the sealing of each part of the wellhead hanger is optimized, so that the wellhead hanger has the advantages of good sealing effect and multiple functions, and can be suitable for oil well operation of heating pipe cables.
Drawings
FIG. 1 is an elevation view of a wellhead hanger of the present invention.
FIG. 2 is a top view of the wellhead hanger of the present invention.
FIG. 3 is a side view of the wellhead hanger of the present invention.
FIG. 4 is a bottom view of the wellhead hanger of the present invention.
FIG. 5 isbase:Sub>A cross-sectional view of the wellhead hanger of the present invention taken along the plane A-A in FIG. 3.
Fig. 6 is an enlarged view of the section S1 shown in fig. 5.
Fig. 7 is an enlarged view of the section S2 shown in fig. 5.
Fig. 8 is an enlarged view of the section S3 shown in fig. 5.
Fig. 9 is an enlarged view of the section S4 shown in fig. 5.
Fig. 10 is a schematic cross-sectional view of a heating umbilical of the present invention.
Fig. 11 is a detailed schematic view of the suspension assembly of the present invention.
Figure 12 is a detailed schematic of the drawing system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1 to 5, 8 and 10, the heating umbilical 6 according to the present invention includes a coiled tubing 61, a cable core 63 and a core jacket 62, the core jacket 62 being wrapped around the cable core 63 and disposed inside the coiled tubing 61. The wellhead hanger for the heating pipe cable comprises a top sealing assembly 1, a hanging assembly 2, a mandrel sealing assembly 3, a bottom sealing assembly 4 and a bypass assembly 5, wherein the top sealing assembly 1, the hanging assembly 2, the mandrel sealing assembly 3 and the bottom sealing assembly 4 are enclosed into a cavity which is through up and down through respective shells, and the heating pipe cable 6 is hung in the cavity through the hanging assembly 2; the bypass assembly 5 is laterally mounted on the suspension assembly 2, the cable rod 50 extends through the bypass assembly 5 into the cavity, and the cable rod 50 is connected with the cable core 63 of the heating tube cable 6 through the suspension assembly 2. During operation, power is supplied to the cable core 63 through the cable rod 50, so that the purpose of heating the coiled tubing is achieved.
As shown in fig. 6, there is shown a schematic view of the construction of the bottom seal assembly 4 according to the present invention. As shown, the lowermost end of the wellhead hanger is provided with a blind flange 41, the blind flange 41 being bolted to a flange seat 45. A sealing element 44 is arranged between the blind flange 41 and the flange seat 45, and the blind flange 41 and the flange seat 45 are respectively provided with a pressure applying opening 42. The blind flange 41 and the flange seat 45 are internally provided with a pressure channel 43, one end of the pressure channel 43 is communicated with the pressure applying port 42, and the other end is communicated with a cavity inside the wellhead hanger. In operation, the pressure applying ports 42 are connected to the gas tree valves of the oil wells.
As shown in fig. 6 and 7, there is shown a schematic structural view of a mandrel seal assembly 3 according to the present invention. The mandrel is positioned in a cavity inside the wellhead hanger, and the lower end of the cavity is in an inverted cone shape. The mandrel sealing assembly comprises an upper mandrel 10 and a lower mandrel 20 which are connected in a threaded manner, a metal sealing ring 30 is further arranged in a lower cavity of the lower mandrel 20, and the bottom end of the metal sealing ring 30 is in contact sealing with the inner conical surface of the shell. As shown in fig. 6, the lower end of the lower mandrel 20 has an inverted trapezoidal shape, and the upper end of the metal seal ring 30 has a pointed shape with a stepped portion. Wherein, the trapezoidal inclined plane of the lower end of the lower mandrel 20 is matched with the sharp inclined plane of the upper end of the metal sealing ring 30 and can slide relatively, and the trapezoidal bottom surface of the lower end of the lower mandrel 20 is matched with the step part of the metal sealing ring 30. Thus, when the lower mandrel 20 moves downward, the lower end of the lower mandrel 20 may slide along the inclined surface of the metal sealing ring 30 until the bottom surface of the lower mandrel 20 abuts against the stepped portion of the metal sealing ring 30. Through the reverse arrangement of these two sealing members of dabber and metallic seal ring down in this application for realized two way seal between casing and the umbilical, ensured sealed reliability between dabber and the umbilical. Preferably, secondary sealing means, such as O-ring seals, are provided between the lower mandrel 20 and the housing, and between the lower mandrel 20 and the umbilical. Therefore, multiple sealing is realized between the shell and the pipe cable, and the sealing effect is enhanced.
A top thread 31 is arranged above the metal sealing ring of the bidirectional sealing, and in the preferred embodiment of the invention, six top threads 31 are uniformly arranged along the circumferential direction of the wellhead hanger. The jackscrew 31 extends into the interior of the cavity along an opening in the casing of the wellhead hanger, with a teflon ring seal 32 between the jackscrew 31 and the casing. The inner end of the top thread 31 inserted into the cavity is tapered, and a pushing member 33 is provided on the lower core shaft 20 at a corresponding position. The pushing member 33 is provided with a pushing slope on its upper surface so that the tapered end of the jack screw 31 can be fitted with the pushing slope. In the process of pushing the jackscrew 31 inwards, the lower mandrel 20 is pressed downwards by advancing along the pushing inclined plane, and the metal sealing ring 30 is driven to move downwards, so that the sealing between the shell and the pipe cable is realized.
As shown in fig. 7 and 8, a detailed structural view of the suspension assembly 2 is shown. As shown, the upper spindle 10 and the lower spindle 20 are threadedly coupled and form a bidirectional suspension between the upper spindle 10 and the lower spindle 20. The upper mandrel 10 is connected with an upper clamping assembly, which includes an upper clamping arm 101 and an upper slip 102 disposed inside the upper clamping arm 101. The lower mandrel 20 is connected with a lower clamping assembly, which includes a lower clamping arm 201 and a lower slip 202 disposed inside the lower clamping arm 201. The inner walls of the upper slip 102 and the lower slip 202 are provided with a snap to grip the outer wall of the coiled tubing, and the upper slip 102 and the lower slip 202 are separated by a spacer 103 to avoid the two slips touching each other. By adopting the bidirectional suspension structure, not only can the pipe cable be prevented from falling into the well due to dead weight, but also the coiled tubing can be prevented from being jacked up due to overlarge underground oil pressure, and the bidirectional movement of the pipe cable can be prevented.
The upper end of the upper mandrel 10 is in threaded connection with the suspension cylinder 40. As shown in fig. 8, the overshot 26 is disposed at the upper end of the hanging cylinder 40, the metal sheath 21 (e.g., a copper sheath) is disposed inside the hanging cylinder 40, a hole is disposed on the peripheral wall of the metal sheath 21, and the pressing wire 22 penetrates through the hole on the peripheral wall of the metal sheath 21 to fix the cable core 63 of the umbilical cord in the inner cavity of the metal sheath 21. An insulating sheath 25 is provided between the suspension tube 40 and the metal sheath 21. The lower portion of the insulating sheath 25 is provided with a first insulating seal 23. The shape of the first insulating seal 23 is configured so as to seal a gap between the lower portion of the insulating sheath 25 and the suspension cylinder 40, and a gap between the suspension cylinder 40 and the core sleeve 62. The lower portion of the first insulating seal 23 is spaced from the core housing 62 by a gap in which the second insulating seal 24 is also filled. Thus, a plurality of insulation seals are formed between the suspension cylinder 40 and the metal sheath 21 to prevent the current conducted to the cable core 63 through the cable bar 50 from leaking to the suspension cylinder. The overshot 26 can be used to lift the mandrel and the umbilical inside it out of the well. In order to facilitate the lifting operation, a cutter 27 may be provided on the inner wall of the housing at a position corresponding to the cable bar 50. In this way, the cable bar 50 is cut by the cutter 27 during the lifting operation, and the smooth progress of the lifting operation can be ensured.
As shown in fig. 8 and 12, there is shown a detailed view of the construction of the bypass assembly 5 according to the present invention. As shown, the cable rod 50 passes through the bypass assembly 5 and contacts the metal sheath 21, thereby achieving the effects of conducting current through the cable rod 50 to the coiled tubing of the umbilical, heating the natural gas or crude oil flowing through the coiled tubing and the annulus of the umbilical, eliminating wax deposition, and the like. The bypass assembly 5 comprises a female flange 51, a pulling system 52, a pressing valve 53 and a sub-flange 54. Female flange 51 is bolted to the casing of the wellhead hanger and male flange 54 is bolted to female flange 51. The pulling system 52 comprises a pulling body 521, a pulling member 522, a clamping jaw 524, an elastic seal 525. Wherein, a cavity is arranged between the sub-flange 54 and the drawing body 521, and an insulating sealing component 541 surrounding the cable rod 50 is arranged in the cavity. The pulling member 522 passes through the end opening of the pulling body 521 to be in tight contact with the insulating seal assembly 541, and an insulating seal member 525 is also provided between the pulling member 522 and the cable bar 50. A clamping jaw 524 is provided between the insulating sealing member 525 between the drawing member 522 and the cable bar 50. The pressurizing valve 53 is provided outside the sub-flange 54 and communicates with the cavity between the sub-flange 54 and the drawing body 521 for introducing pressure therein. After pressure is injected through the pressurizing valve 53, the pressure between the sub-flange 54 and the drawing body 521 is increased, the drawing body 521 is pushed to move outwards, and the clamping piece 524 is driven to clamp the cable rod to move outwards, so that the purpose of pulling out the cable rod is achieved.
As shown in fig. 9, a schematic view of the top seal assembly 1 is shown. As shown, the top seal assembly 1 includes a flat valve 15, a top flange seat 14, a top blind flange 13, a pressure resistant valve 12, and a pressure gauge 11. Wherein, the top blind flange 13 is provided with a top pressure channel 131 in the middle, one end of the top pressure channel 131 is communicated with the inner cavity of the flat valve 15, and the other end is respectively connected with the pressure-resistant valve 12 and the pressure gauge 11 through a three-way pipe 132, so as to control and monitor the pressure change condition inside the cavity of the shell.
Through the bypass assembly of the wellhead hanger, the traditional two-way wellhead hanger is changed into the three-way wellhead hanger, and the cable rod penetrates through the bypass assembly, so that the problem of heating the heating pipe cable by electrifying is solved. Meanwhile, the sealing of each part of the wellhead hanger is optimized, so that the wellhead hanger has the advantages of good sealing effect and multiple functions, and can be suitable for oil well operation of heating pipe cables.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A wellhead hanger of a heating pipe cable comprises a continuous oil pipe, a cable core and a core sleeve, wherein the core sleeve is wrapped outside the cable core and is arranged inside the continuous oil pipe; the bypass assembly is laterally arranged on the suspension assembly, and the cable rod penetrates through the bypass assembly to extend into the cavity and is connected with a cable core of the heating cable;
the mandrel sealing assembly comprises a mandrel, a metal sealing ring is further arranged in a cavity at the lower part of the mandrel, and the bottom end of the metal sealing ring is in contact sealing with the inner conical surface of the shell; the trapezoidal inclined plane at the lower end of the mandrel is matched with the sharp-angled inclined plane at the upper end of the metal sealing ring, so that the metal sealing ring is respectively sealed with the shell and the continuous oil pipe in two directions;
the mandrel comprises an upper mandrel and a lower mandrel which are connected in a threaded manner, and a metal sealing ring is also arranged in a lower cavity of the lower mandrel; the lower end of the lower mandrel is in an inverted trapezoid shape, and the upper end of the metal sealing ring is in a sharp-angled shape with a step part; the trapezoidal inclined plane at the lower end of the lower mandrel is matched with the sharp-angled inclined plane at the upper end of the metal sealing ring and can slide relatively, and the trapezoidal bottom surface at the lower end of the lower mandrel is matched with the step part of the metal sealing ring;
the bypass assembly comprises a female flange, a drawing system, a pressurizing valve and a sub-flange, the female flange is fixed on a shell of the wellhead hanger through bolts, and the sub-flange is fixed on the female flange through bolts; the drawing system comprises a drawing body, a drawing piece, a clamping piece and an elastic sealing piece, wherein a cavity is formed between the sub-flange and the drawing body, an insulating sealing assembly surrounding the cable rod is arranged in the cavity, and the drawing piece penetrates through an end opening of the drawing body and is in abutting contact with the insulating sealing assembly; an insulating sealing part is arranged between the drawing part and the cable rod, and a clamping fastener is arranged between the insulating sealing part and the cable rod; the pressure valve is arranged outside the sub-flange.
2. A wellhead hanger as claimed in claim 1, wherein the lowermost end of the wellhead hanger is provided with a blind flange, the blind flange is fixed to a flange seat through bolts, a sealing member is arranged between the blind flange and the flange seat, and the blind flange and the flange seat are respectively provided with a pressure applying port and a pressure channel inside.
3. A wellhead hanger as claimed in claim 1 or claim 2 wherein a jackscrew is provided above the metal seal ring, the jackscrew extending into the interior of the cavity along the opening in the housing, the inner end of the jackscrew inserted into the cavity being tapered, the mandrel being provided with a push ramp so that the tapered end of the jackscrew can cooperate with the push ramp.
4. A wellhead hanger as claimed in claim 1 or claim 2, wherein the mandrel is connected to a clamping assembly comprising a clamping arm and two slips disposed internally of the clamping arm; the two slips form a bidirectional suspended structure.
5. A wellhead hanger according to claim 1 or 2, characterized in that the upper end of the upper mandrel is in threaded connection with a hanging barrel, the upper end of the hanging barrel is provided with an overshot, and the interior of the hanging barrel is provided with a metal sheath;
an insulating sheath is arranged between the suspension cylinder and the metal sheath, a first insulating sealing element is arranged at the lower part of the insulating sheath, and the shape of the first insulating sealing element is configured to seal a gap between the lower part of the insulating sheath and the suspension cylinder and a gap between the suspension cylinder and the core sleeve; a lower portion of the first insulating seal is spaced from the core sleeve and filled with a second insulating seal.
6. A wellhead hanger as claimed in claim 1 or 2, wherein the top sealing assembly comprises a plate valve, a top flange seat, a top blind flange, a pressure-resistant valve and a pressure gauge, a top pressure channel is provided in the middle of the top blind flange, one end of the top pressure channel is communicated with the inner cavity of the plate valve, and the other end is connected with the pressure-resistant valve and the pressure gauge through a three-way pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710324736.8A CN107013177B (en) | 2017-05-10 | 2017-05-10 | Wellhead hanger for heating pipe cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710324736.8A CN107013177B (en) | 2017-05-10 | 2017-05-10 | Wellhead hanger for heating pipe cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107013177A CN107013177A (en) | 2017-08-04 |
| CN107013177B true CN107013177B (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710324736.8A Active CN107013177B (en) | 2017-05-10 | 2017-05-10 | Wellhead hanger for heating pipe cable |
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| CN (1) | CN107013177B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108086951B (en) * | 2018-01-12 | 2024-04-19 | 科莱斯（天津）电热科技有限公司 | High-pressure wellhead T-cable suspension device with overcurrent side channel |
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|---|---|---|---|---|
| US4154302A (en) * | 1977-10-31 | 1979-05-15 | Shafco Industries, Inc. | Cable feed-through method and apparatus for well head constructions |
| CN201292830Y (en) * | 2008-11-18 | 2009-08-19 | 大港油田集团新世纪机械制造有限公司 | Gusher and electric pump well sucker rod electric heater unit |
| GB201212697D0 (en) * | 2012-07-17 | 2012-08-29 | Artificial Lift Co Ltd | Wellhead assembly for downhole tool deployment |
| CN206737877U (en) * | 2017-05-10 | 2017-12-12 | 河北华通线缆集团股份有限公司 | A kind of well mouth hanger for heating umbilical |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7552762B2 (en) * | 2003-08-05 | 2009-06-30 | Stream-Flo Industries Ltd. | Method and apparatus to provide electrical connection in a wellhead for a downhole electrical device |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4154302A (en) * | 1977-10-31 | 1979-05-15 | Shafco Industries, Inc. | Cable feed-through method and apparatus for well head constructions |
| CN201292830Y (en) * | 2008-11-18 | 2009-08-19 | 大港油田集团新世纪机械制造有限公司 | Gusher and electric pump well sucker rod electric heater unit |
| GB201212697D0 (en) * | 2012-07-17 | 2012-08-29 | Artificial Lift Co Ltd | Wellhead assembly for downhole tool deployment |
| CN206737877U (en) * | 2017-05-10 | 2017-12-12 | 河北华通线缆集团股份有限公司 | A kind of well mouth hanger for heating umbilical |
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|---|---|
| CN107013177A (en) | 2017-08-04 |
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