CN115949364B - Speed pipe column, wellhead device thereof and coiled tubing lowering method - Google Patents
Speed pipe column, wellhead device thereof and coiled tubing lowering method Download PDFInfo
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- CN115949364B CN115949364B CN202310220862.4A CN202310220862A CN115949364B CN 115949364 B CN115949364 B CN 115949364B CN 202310220862 A CN202310220862 A CN 202310220862A CN 115949364 B CN115949364 B CN 115949364B
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a speed pipe column, a wellhead device thereof and a coiled tubing lowering method, which belong to the technical field of petroleum drilling equipment and comprise a speed pipe column body, a coiled tubing hanger and a first jackscrew; the speed pipe column body comprises a first bearing step; the continuous oil pipe hanger comprises a plurality of split hangers, each hanger comprises a part of supporting plate, a sealing ring, a hanger body and slips which are sequentially and fixedly connected, the continuous oil pipe is buckled in the middle by the plurality of hangers and integrally arranged in the speed pipe column body, and the slips clamp the continuous oil pipe; the support plate is provided with a support part, the top of the hanger body is provided with a slope surface, the first jackscrew radially penetrates through the speed pipe column body and is provided with a conical surface at the end part, and the sealing ring radially extrudes and adheres to the outer wall of the continuous oil pipe along with the centripetal movement of the first jackscrew. The invention can integrally install the support plate, the sealing ring, the hanger body and the slips, realizes clamping and sealing of the continuous oil pipe, and is convenient to install and use.
Description
Technical Field
The invention relates to the technical field of petroleum drilling equipment, in particular to a speed pipe column, a wellhead device thereof and a coiled tubing lowering method.
Background
Shale oil and shale gas are used as unconventional oil and gas resources and are in a strong development stage at present, however, conventional oil pipes are still used for exploiting the shale oil at the present stage, the conventional oil pipes are connected with an oil pipe hanger through threads, the installation time is long, a buckling machine is needed during threaded connection, and the complex equipment connection is troublesome.
Compared with the conventional oil pipe, the coiled tubing has the advantages of simple operation, less operators, low cost, quick movement, small occupied area, environmental protection, short tripping time, reduced production stopping time, capability of circulating during tripping, capability of operating under pressure when the coiled tubing is closed, small damage to stratum and the like. But the existing coiled tubing is relatively inconvenient to install and use.
Chinese patent application publication No. CN 103470203A discloses a coiled tubing speed string hanger and a hanging method thereof, comprising an upper flange, a conical slip, a sealing ring, a slip jackscrew, a C-shaped slip, a piston jackscrew, a piston, an annular sealing gasket, a bypass valve, a lower flange, a hanger body and a slip seat; the piston jackscrew is positioned on the hanger body, and the piston and the annular sealing gasket are positioned in the hanger body; the slip jackscrew is positioned on the hanger body; the sealing ring and the conical slips are both arranged in the continuous oil pipe body, the sealing ring is arranged on a sealing ring seat at the lower part of the continuous oil pipe body, and the conical slips are arranged at the upper part of the sealing ring; the hanger body is connected with the bypass valve through a flange plate. In the scheme, the structures such as the piston, the annular sealing gasket, the conical slips and the like are required to be installed and combined one by one in the installation process, and the replacement process is complicated if the structures are required to be replaced.
The invention discloses a Chinese patent with application publication number of CN 104358536A, which relates to a speed tubular column coiled tubing hanger, comprising a coiled tubing, an I-shaped flange, an upper slip assembly, a lower slip assembly, an upper shell, a middle shell and a lower shell, wherein the upper shell, the middle shell and the lower shell are all provided with middle holes which are communicated up and down, the I-shaped flange is fixedly arranged at the top of the upper shell, the coiled tubing sequentially passes through the middle holes of the I-shaped flange, the upper shell, the middle shell and the lower shell, the upper slip assembly is clamped on the inner wall of the middle hole of the upper shell, the lower slip assembly is positioned in the middle hole of the middle shell, a connecting tube sealing group is fixedly arranged on the inner wall of the middle hole of the middle shell and below a hanging support sleeve, at least one pair of driving pistons is arranged below the connecting tube sealing group, and an upper oil port and a lower oil port which are respectively communicated with the driving pistons are arranged on the side walls of the middle shell and the lower shell. According to the scheme, the hydraulic station presses the downward oil port, so that the driving piston compresses the connecting pipe sealing group upwards, the outer ring of the continuous oil pipe is sealed, the second jackscrew group is operated to lock the driving piston, the sealing of the outer ring of the continuous oil pipe is kept, the second jackscrew group of the scheme is of a limiting structure, a power source for sealing is hydraulic oil, and the scheme is complex in structure and is not beneficial to disassembly and replacement.
In summary, the existing coiled tubing is inconvenient to install and use.
Disclosure of Invention
The invention aims to provide a speed pipe column, a wellhead device thereof and a coiled tubing lowering method, which solve the problems in the prior art, the coiled tubing hanger is arranged into a plurality of split hangers, the coiled tubing is buckled between the hangers, clamping of the coiled tubing is realized by using slips, axial and radial limiting is carried out by virtue of a speed pipe column body after the coiled tubing is arranged in a speed pipe column body, and sealing of a sealing ring is realized by virtue of a first jackscrew, so that a supporting plate, the sealing ring, the hanger body and the slips are integrally arranged, clamping and sealing of the coiled tubing are realized, and the installation and the use are more convenient.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a speed pipe column, which comprises a speed pipe column body, a continuous oil pipe hanger and a first jackscrew, wherein the speed pipe column body is provided with a first jack; the speed pipe column body comprises a large-diameter section, a small-diameter section and a first bearing step connected between the large-diameter section and the small-diameter section; the coiled tubing hanger comprises a plurality of hangers which are separated along an axial section, each hanger comprises a part of supporting plate, a sealing ring, a hanger body and slips which are sequentially and fixedly connected, the coiled tubing is buckled in the middle by the hangers, the slips are used for clamping the coiled tubing, and the whole coiled tubing hanger is axially arranged in the speed tubular column body; the support plate is provided with a support part which is erected on the first bearing step, the top of the hanger body is provided with a slope surface, the first jackscrew radially penetrates through the speed pipe column body, the end part of the first jackscrew is provided with a conical surface which is attached to the slope surface, and along with the radial centripetal movement of the first jackscrew, the sealing ring axially compresses and then radially centripetally extrudes and attaches to the outer wall of the continuous oil pipe.
Preferably, the hanger body is provided with a tapered hole, the slips are installed in the tapered hole, the same hanger is connected with the supporting plate, the sealing ring and the hanger body through first screws axially arranged, the same hanger is connected with the slips and the hanger body through second screws radially arranged, and different hanger bodies of the hanger are connected through third screws perpendicular to the axial direction.
Preferably, a gasket is arranged between the hanger body and the sealing ring, the inner diameter and the outer diameter of the gasket are consistent with the inner diameter and the outer diameter of the sealing ring, and the first screw penetrates through the gasket.
Preferably, the first bearing step adopts an inner conical surface structure, the large diameter of the inner conical surface structure is equal to the diameter of the large diameter section, the small diameter of the inner conical surface structure is equal to the diameter of the small diameter section, the supporting part adopts an outer conical surface structure, and the taper of the outer conical surface structure is equal to that of the inner conical surface structure.
Preferably, the slope surface is an outer conical surface arranged at the top end of the hanger body.
The invention provides a wellhead device, which comprises a tubing head four-way and a speed string as described above, wherein the tubing head four-way comprises an upper port, a lower port and two side ports, the lower port is connected with an oil well, the upper port is sequentially connected with a control valve, the speed string and a christmas tree assembly, one side port is connected with a first gate valve, the other side port is sequentially connected with a first gate valve, a first meter flange, a first throttle valve and a first check valve, two ends of a speed string body are respectively provided with a connecting flange, the connecting flange at the upper end is connected with the christmas tree assembly, and the connecting flange at the lower end is connected with the control valve.
Preferably, a first pressure gauge and a pressure transmitter are connected to the first meter flange.
Preferably, a conversion flange is arranged between the connection flange at the upper end and the christmas tree assembly, and the diameter of the lower end of the conversion flange is larger than that of the upper end.
Preferably, the upper port is provided with a second jackscrew along the radial direction, a second bearing step is coaxially arranged in the tubing head four-way joint and is used for bearing a conventional tubing hanger, and the second jackscrew is used for fixing the conventional tubing hanger.
The invention also provides a coiled tubing lowering method, which is applied to the wellhead device, and comprises the following steps:
the upper port of the tubing head four-way is sequentially connected with a control valve and a speed string, and the upper part of the speed string is sequentially connected with an operation window, a blowout preventer, a blowout prevention box and an injection head;
the coiled tubing is lowered into the speed string body through the injection head and enters the well;
after the coiled tubing is lowered into place, connecting a coiled tubing hanger with the coiled tubing, and installing the coiled tubing hanger into the speed string body through the operation window;
and taking down the operation window, the blowout preventer and the injection head from the upper part of the speed pipe column, replacing and installing the christmas tree assembly, and completing the installation of the wellhead.
Compared with the prior art, the invention has the following technical effects:
(1) According to the invention, the coiled tubing hanger is arranged into a plurality of split hangers, each hanger comprises a part of supporting plate, a sealing ring, a hanger body and slips which are fixedly connected, the coiled tubing can be clamped between the hangers by the slips, the axial and radial limiting is carried out by the speed string body after the coiled tubing is arranged in the speed string body, and the sealing of the sealing ring is realized by the first jackscrew, so that the supporting plate, the sealing ring, the hanger body and the slips can be integrally arranged, the clamping and sealing of the coiled tubing are realized, and the installation and the use are more convenient;
(2) The invention is provided with the second bearing step for bearing the conventional oil pipe hanger in the four-way of the oil pipe head, and is provided with the second jackscrew at the upper opening of the four-way of the oil pipe head, so that the speed pipe column and the continuous oil pipe hanger can be canceled when necessary, the conventional oil pipe hanger for hanging oil pipes with different sizes can be put down, the conventional oil pipe hanger is connected with a cable, and an electric pump is added into the wellhead and connected with the cable, thereby reforming the wellhead into an electric pump structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a wellhead assembly of the present invention;
FIG. 2 is a schematic view of a coiled tubing lowering apparatus according to the present invention;
FIG. 3 is a schematic diagram of a velocity string structure according to the present invention;
FIG. 4 is a schematic view of a coiled tubing hanger according to the present invention;
FIG. 5 is a schematic view of a tubing head four-way assembly of the present invention;
FIG. 6 is a schematic diagram of a tree assembly according to the present invention;
1, an oil pipe head four-way assembly; 11. a tubing head four-way joint; 12. a first gate valve; 13. a first embedded blind flange; 14. a first meter flange; 15. a first pressure gauge; 16. a first stop valve; 17. a first throttle valve; 18. a first transition four-way; 19. a first check valve; 110. a pressure transmitter; 111. a second load-bearing step; 112. a second jackscrew; 2. a control valve; 3. a velocity string; 31. a first load-bearing step; 32. a large diameter section; 33. a small diameter section; 34. a first jackscrew; 4. a coiled tubing hanger; 41. a support plate; 42. a seal ring; 43. a gasket; 44. a hanger body; 45. a slip; 46. a first screw; 47. a second screw; 48. a third screw; 5. a conversion flange; 6. a tree assembly; 61. a combination valve; 62. a second gate valve; 63. the second embedded blind flange; 64. a blind flange; 65. a second meter flange; 66. a second pressure gauge; 67. a second shut-off valve; 68. a safety valve; 69. a second throttle valve; 610. a second transition four-way; 611. a second check valve; 7. an operation window; 8. blowout preventer; 9. a blowout prevention box; 10. an injection head.
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.
The invention aims to provide a speed pipe column, a wellhead device thereof and a coiled tubing lowering method, which are used for solving the problems in the prior art.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 3 to 4, the present invention provides a velocity string 3, which includes a velocity string body, a coiled tubing hanger 4 and a first jack screw 34, wherein the coiled tubing hanger 4 is installed in the velocity string body, and the first jack screw 34 can limit the position of the coiled tubing hanger 4 in the velocity string body. The speed pipe column body comprises a large-diameter section 32, a small-diameter section 33 and a first bearing step 31 connected between the large-diameter section 32 and the small-diameter section 33, wherein the first bearing step 31 can be in the structural forms of inclined planes, straight planes and the like, and the coiled tubing hanger 4 is supported by the first bearing step 31 after being installed by the large-diameter section 32. The coiled tubing hanger 4 comprises a plurality of hangers split along an axial section, for example, the hanger can be divided into a plurality of sector-shaped petals and also can be divided into two semicircular petals. Each flap hanger comprises a portion of a support plate 41, a sealing ring 42, a hanger body 44 and a slip 45 which are fixedly connected in sequence, and the different hangers can form a complete circle of the support plate 41, the sealing ring 42, the hanger body 44 and the slip 45 after being combined. When the hangers are combined, the coiled tubing is buckled in the middle, and the coiled tubing is clamped by the slips 45 to be hung and supported. The buckled coiled tubing hanger 4 is integrally and axially arranged in the speed string body, and the inner diameter of the large-diameter section 32 just can accommodate the outer diameter of the coiled tubing hanger 4, namely the large-diameter section 32 forms radial constraint on the coiled tubing hanger 4, so that the split coiled tubing hanger 4 is integrally clamped in the large-diameter section 32. It should be noted that after the hanger is snapped, a different hanger may also be locked by the third screw 48 to further ensure integrity and locking of the relative position of the coiled tubing. The support plate 41 is provided with a support portion provided on the first carrying step 31, the shape of which is matched with that of the first carrying step 31. The top of hanger body 44 is provided with the slope, and first jackscrew 34 radially runs through the speed tubular column body, is provided with the toper face of laminating with the slope at the tip of going deep into the speed tubular column body, is located the tip of speed tubular column body through rotating first jackscrew 34, can make first jackscrew 34 radial centripetal movement, through the cooperation of slope and toper face, hanger body 44 is forced along axial displacement, and then, sealing washer 42 is compressed and deformed by the axial, and sealing washer 42 after the deformation radially centripetal extrusion laminating realizes the seal on coiled tubing's outer wall. In summary, the coiled tubing hanger 4 is arranged into the plurality of split hangers, each hanger comprises a part of supporting plate 41, a sealing ring 42, a hanger body 44 and slips 45 which are fixedly connected, the coiled tubing can be clamped by the slips 45 after being buckled among the plurality of hangers, the coiled tubing is axially and radially limited by the speed string body after being installed in the speed string body, and the sealing ring 42 is sealed by the first jackscrew 34, so that the supporting plate 41, the sealing ring 42, the hanger body 44 and the slips 45 can be integrally installed, clamping and sealing of the coiled tubing are realized, and the installation and the use are more convenient.
The hanger body 44 is provided with a tapered bore in which the slips 45 are mounted, and the slips 45 and hanger body 44 of the same hanger are connected by radially disposed second screws 47. The support plate 41, the sealing ring 42 and the hanger body 44 of the same hanger are connected by means of axially arranged first screws 46, i.e. the components of the same hanger are fixedly connected when the hanger is in the split open state. In addition, the first screw 46 penetrates the support plate 41 and the seal ring 42 from the bottom up in sequence, and is then screwed to the hanger body 44, at this time, the first screw 46, the seal ring 42 and the support plate 41 can slide relatively, when the hanger body 44 moves downward under the action of the first jackscrew 34, the first screw 46 moves downward together with the hanger body 44, the support plate 41 is fixed, and the seal ring 42 can be compressively deformed. The hanger bodies 44 of the different hangers are connected by a third screw 48 perpendicular to the axial direction after the coiled tubing is buckled, at this time, the slips 45 are clamped and fixed with the coiled tubing, and are supported by the first bearing step 31 after being installed into the large-diameter section 32 of the speed string body.
The gasket 43 can be arranged between the hanger body 44 and the sealing ring 42, and similarly, the gasket 43 is installed in a split mode according to split conditions of the hanger, the inner diameter and the outer diameter of the gasket 43 are consistent with the inner diameter and the outer diameter of the sealing ring 42, the inner diameter of the gasket 43 is used for penetrating a continuous oil pipe, and the compression degree of the sealing ring 42 can be adjusted by replacing the gaskets 43 with different thicknesses. When the spacer 43 is installed, the first screw 46 penetrates the spacer 43, and the spacer 43 is integrally connected with the hanger body 44.
The first bearing step 31 may adopt an inner conical surface structure, the large diameter of the inner conical surface structure is equal to the diameter of the large diameter section 32, the small diameter of the inner conical surface structure is equal to the diameter of the small diameter section 33, the supporting part of the supporting plate 41 adopts an outer conical surface structure, and the taper of the outer conical surface structure is equal to that of the inner conical surface structure. After the coiled tubing hanger 4 is installed in the velocity string body, the support plate 41 can be smoothly installed in place, and the smoothness of the installation process and the stability of the use state after installation are ensured.
The inclined surface arranged at the top of the hanger body 44 is an external conical surface arranged at the top of the hanger body, and after the coiled tubing hanger 4 is installed, no matter which position the circumferential direction of the hanger body is positioned, the hanger body can be matched with the conical surface of the first jackscrew 34, and the operation of smoothly jacking the tight seal ring 42 can be realized without rotary positioning.
As shown in fig. 1 and 5-6, the invention provides a wellhead device, which comprises a tubing head four-way assembly 1, wherein the tubing head four-way assembly 1 comprises a tubing head four-way 11 and an accessory structure thereof, the tubing head four-way 11 is connected with a speed string 3 as described above, the tubing head four-way 11 comprises an upper port, a lower port and two side ports, the lower port is connected with an oil well, the upper port is sequentially connected with a control valve 2, the speed string 3 and a christmas tree assembly 6, the on-off of an oil wellhead can be realized through the control valve 2, and the installation of a continuous oil pipe is facilitated. One or two first gate valves 12 are connected to one side port, and a first embedded blind flange 13 is arranged at the end part of the first gate valve. The other side port is sequentially connected with a first gate valve 12, a first meter flange 14, a first throttle valve 17 and a first single throttle valve 19, and a first transition four-way 18 is arranged between the first throttle valve 17 and the first single throttle valve 19. The both ends of speed tubular column body are provided with flange respectively, and flange and the production tree assembly 6 of upper end are connected, and flange and the control valve 2 of lower extreme are connected.
A first pressure gauge 15 and a pressure transmitter 110 are connected to the first meter flange 14, monitoring the side outlet pressure and a first shut-off valve 16 is arranged on the line leading to the first pressure gauge 15. In addition, a further first pressure gauge 15 is connected to the first throttle valve 17, and a further first shut-off valve 16 is correspondingly provided.
A conversion flange 5 is arranged between the connecting flange at the upper end of the speed pipe column body and the christmas tree assembly 6, and the diameter of the lower end of the conversion flange 5 is larger than that of the upper end, so that the components with different sizes can be conveniently connected.
The upper port of the tubing head four-way 11 is provided with a second jackscrew 112 along the radial direction, the tubing head four-way 11 is internally and coaxially provided with a second bearing step 111, the second bearing step 111 is used for bearing a conventional tubing hanger, and the second jackscrew 112 is used for fixing the conventional tubing hanger. When necessary, the speed pipe column 3 and the continuous oil pipe hanger 4 can be omitted, a conventional oil pipe hanger for hanging oil pipes with different sizes is put in, a cable is connected to the conventional oil pipe hanger, and an electric pump is added into the wellhead to be connected with the cable, so that the wellhead can be transformed into an electric pump structure.
The christmas tree assembly 6 comprises a combined valve 61 and a blind flange 64 which are connected to the conversion flange 5, wherein the blind flange 64 is arranged at the top end, one side of the combined valve 61 is provided with a second gate valve 62 and a second embedded blind flange 63, the other side of the combined valve is sequentially provided with a second gate valve 62, a second meter flange 65, a safety valve 68, a second throttle valve 69, a second transition four-way valve 610 and a second uniflow valve 611, the second meter flange 65 and the second throttle valve 69 are respectively provided with a second pressure gauge 66 for controlling the flow rate of liquid in a well, and a second stop valve 67 is arranged on a pipeline connected with the second pressure gauge 66. The tree assembly 6 provides access and oil production control for the oil production operation, ensuring efficient and safe delivery of produced oil.
The invention also provides a coiled tubing lowering method, which is applied to the wellhead device as described above and comprises the following steps of:
the upper port of the tubing head four-way joint 11 is sequentially connected with the control valve 2 and the speed string 3, and the upper part of the speed string 3 is sequentially connected with the operating window 7, the blowout preventer 8, the blowout preventer 9 and the injection head 10;
the coiled tubing is lowered into the velocity string body through the injector head 10 and into the well;
after the coiled tubing is lowered into place, the coiled tubing hanger 4 is connected with the coiled tubing, a plurality of hangers are fastened with the coiled tubing and then locked by the third screw 48, and then the coiled tubing is installed in the speed string body through the operation window 7 and supported by the first bearing step 31 in the speed string body;
and taking down the operation window 7, the blowout preventer 8, the blowout preventer 9 and the injection head 10 from the upper part of the speed pipe column 3, replacing and installing the christmas tree assembly 6, and completing the installation of the wellhead.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A speed string, characterized by: the device comprises a speed pipe column body, a continuous oil pipe hanger and a first jackscrew; the speed pipe column body comprises a large-diameter section, a small-diameter section and a first bearing step connected between the large-diameter section and the small-diameter section; the coiled tubing hanger comprises a plurality of hangers which are separated along an axial section, each hanger comprises a part of supporting plate, a sealing ring, a hanger body and slips which are sequentially and fixedly connected, the coiled tubing is buckled in the middle by the hangers, the slips are used for clamping the coiled tubing, and the whole coiled tubing hanger is axially arranged in the speed tubular column body; the support plate is provided with a support part which is erected on the first bearing step, the top of the hanger body is provided with a slope surface, the first jackscrew radially penetrates through the speed pipe column body, the end part of the first jackscrew is provided with a conical surface which is attached to the slope surface, and along with the radial centripetal movement of the first jackscrew, the sealing ring axially compresses and then radially centripetally extrudes and attaches to the outer wall of the continuous oil pipe; the hanger body is provided with a conical hole, the slips are installed in the conical hole, the same hanger is connected with the supporting plate of the hanger through a first screw arranged in the axial direction, the same hanger is connected with the slips through a second screw arranged in the radial direction, and the hanger bodies of different hangers are connected through a third screw perpendicular to the axial direction.
2. A speed string according to claim 1, characterized in that: the hanger comprises a hanger body and a sealing ring, wherein a gasket is arranged between the hanger body and the sealing ring, the inner diameter and the outer diameter of the gasket are consistent with the inner diameter and the outer diameter of the sealing ring, and a first screw penetrates through the gasket.
3. A speed string according to claim 1, characterized in that: the first bearing step adopts an inner conical surface structure, the large diameter of the inner conical surface structure is equal to the diameter of the large diameter section, the small diameter of the inner conical surface structure is equal to the diameter of the small diameter section, the supporting part adopts an outer conical surface structure, and the taper of the outer conical surface structure is equal to that of the inner conical surface structure.
4. A speed string according to claim 1, characterized in that: the slope surface is an outer conical surface arranged at the top end of the hanger body.
5. A wellhead assembly, characterized in that: the oil pipe head four-way joint comprises an upper port, a lower port and two side ports, wherein the lower port is connected with an oil well, the upper port is sequentially connected with a control valve, the speed pipe column and a christmas tree assembly, one side port is connected with a first gate valve, the other side port is sequentially connected with a first gate valve, a first meter flange, a first throttle valve and a first uniflow valve, two ends of the speed pipe column body are respectively provided with a connecting flange, the connecting flange at the upper end is connected with the christmas tree assembly, and the connecting flange at the lower end is connected with the control valve.
6. The wellhead assembly of claim 5, wherein: and the first meter flange is connected with a first pressure gauge and a pressure transmitter.
7. The wellhead assembly of claim 5, wherein: and a conversion flange is arranged between the connecting flange at the upper end and the christmas tree assembly, and the diameter of the lower end of the conversion flange is larger than that of the upper end.
8. The wellhead assembly of claim 5, wherein: the upper port is provided with a second jackscrew along the radial direction, a second bearing step is coaxially arranged in the tubing head four-way joint and the upper port, the second bearing step is used for bearing a conventional tubing hanger, and the second jackscrew is used for fixing the conventional tubing hanger.
9. A coiled tubing lowering method, characterized by the use of a wellhead device as claimed in any one of claims 5 to 8, comprising the following:
the upper port of the tubing head four-way is sequentially connected with a control valve and a speed string, and the upper part of the speed string is sequentially connected with an operation window, a blowout preventer, a blowout prevention box and an injection head;
the coiled tubing is lowered into the speed string body through the injection head and enters the well;
after the coiled tubing is lowered into place, connecting a coiled tubing hanger with the coiled tubing, and installing the coiled tubing hanger into the speed string body through the operation window;
and taking down the operation window, the blowout preventer and the injection head from the upper part of the speed pipe column, replacing and installing the christmas tree assembly, and completing the installation of the wellhead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310220862.4A CN115949364B (en) | 2023-03-09 | 2023-03-09 | Speed pipe column, wellhead device thereof and coiled tubing lowering method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310220862.4A CN115949364B (en) | 2023-03-09 | 2023-03-09 | Speed pipe column, wellhead device thereof and coiled tubing lowering method |
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| CN115949364A CN115949364A (en) | 2023-04-11 |
| CN115949364B true CN115949364B (en) | 2023-06-09 |
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| CN117072104B (en) * | 2023-10-13 | 2024-01-09 | 大庆市天德忠石油科技有限公司 | Oil well casing head |
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| CN208966249U (en) * | 2018-10-24 | 2019-06-11 | 山东科瑞井控系统制造有限公司 | A kind of compact coaxial double-pipe injection-production well mouth device |
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| US7455105B1 (en) * | 2005-08-08 | 2008-11-25 | Mckee Jim D | Apparatus and method for installing coiled tubing in a well |
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| CN215169866U (en) * | 2021-01-27 | 2021-12-14 | 江苏腾龙石化机械有限公司 | Injection-production dual-purpose wellhead device using coiled tubing hanger |
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| CN208966249U (en) * | 2018-10-24 | 2019-06-11 | 山东科瑞井控系统制造有限公司 | A kind of compact coaxial double-pipe injection-production well mouth device |
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