An underwater dual-electric pump tubing hanger and system

Abstract

The present application relates to a kind of underwater double electric pump tubing hangers and systems, and the hanger includes: tubing hanger body, the top of tubing hanger body is provided with lifting ring;Phase wet plug, installation is in the top of tubing hanger body, phase wet plug includes six circuits, every three roads is a group, respectively, two underwater electric pump transports three-phase power supply;Internal cable channel, setting is below phase wet plug, the top of internal cable channel is provided with cable seal, for with phase wet plug sealed connection;Bottom cable connector, setting is below internal cable channel, for the power supply provided by phase wet plug is transmitted to downstream electric pump.This tubing hanger adopts six-way electric connector to be penetrated, for two underwater electric pumps respectively transport power supply, when one of electric pump fails, enable another standby electric pump, avoid complicated well repair operation, greatly improve economic benefit and time benefit.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of underwater double electric pump tubing hanger and system, belong to petroleum drilling and production equipment technical field. BACKGROUND

[0002] Ocean underwater production system is composed of multiple sets of underwater wellhead and oil production equipment, and the underwater wellhead and oil production equipment are the key nodes in the seabed oil and gas transmission channel, and the main function is to effectively control the working pressure from the seabed wellhead, to ensure that the seabed oil and gas is transmitted to the seabed oil and gas gathering and transportation processing system according to the set flow rate and flow, and ultimately transmitted to the oil production platform and the coastline. The underwater Christmas tree is widely used in the process of underwater oil and gas field exploitation, and is an extremely important equipment in the process of drilling and completion. The tubing hanger is one of the main components of the underwater Christmas tree, which is located in the body of the Christmas tree, and its main function is to suspend the production string, seal the annular space between the production string and the oil layer casing, provide oil flow passage, well repair passage, downhole safety valve hydraulic passage, chemical reagent injection passage, electrical passage and the like.

[0003] Generally, one set of tubing hanger is equipped with one set of electrical circuit, which drives one underwater electric pump. When the underwater electric pump fails, well repair operation is needed, which is very cumbersome. SUMMARY

[0004] In view of the above technical problems, the present application provides an underwater double electric pump tubing hanger and system, which adopts six-way electrical connector for penetration, and supplies power to two underwater electric pumps. When one of the electric pumps fails, the other standby electric pump is started to avoid the cumbersome well repair operation, thereby greatly improving the economic benefit and time benefit.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] An underwater double electric pump tubing hanger, comprising:

[0007] A tubing hanger body, a lifting ring is arranged at the top of the tubing hanger body, and the lifting ring is conveyed to the inside of the main valve block of the Christmas tree by a running tool;

[0008] A phase separation wet plug is installed at the top of the tubing hanger body, and the phase separation wet plug comprises six circuits, each three circuits form a group, and three-phase power is supplied to two underwater electric pumps respectively;

[0009] An internal cable passage is arranged below the phase separation wet plug, and a cable sealing element is arranged at the top of the internal cable passage for sealing connection with the phase separation wet plug;

[0010] A bottom cable connector is arranged below the internal cable passage for transmitting the power provided by the phase separation wet plug to the downstream electric pump.

[0011] The underwater dual-electric pump tubing hanger preferably further comprises a setting ring and a sealing ring, the setting ring is sleeved on the outside of the lifting ring, the sealing ring is located below the setting ring, and a tooth is arranged on the outer wall of the setting ring and matched with a groove in the main valve block of the Christmas tree.

[0012] The underwater dual-electric pump tubing hanger preferably, a second positioning key is arranged on the outer wall of the tubing hanger body, the second positioning key is in fastening connection with the tubing hanger body, a key groove is formed in the inner wall of the channel of the main valve block of the Christmas tree, and the second positioning key is in engagement with the key groove in the inner wall of the channel of the main valve block of the Christmas tree.

[0013] The underwater dual-electric pump tubing hanger preferably, a metal sealing bushing, an upper metal sealing ring located above the metal sealing bushing, and a lower metal sealing ring located below the metal sealing bushing are arranged on the lower part of the tubing hanger body, and the metal sealing bushing is used for supporting the upper metal sealing ring and the lower metal sealing ring.

[0014] The underwater dual-electric pump tubing hanger preferably, a metal sealing retaining ring, a threaded ring, and an S-shaped sealing ring retaining ring are further arranged on the lower part of the tubing hanger body, the metal sealing retaining ring is installed below the lower metal sealing ring, and the S-shaped sealing ring retaining ring is installed between the metal sealing retaining ring and the threaded ring.

[0015] The underwater dual-electric pump tubing hanger preferably, grooves are arranged on the inner and outer side walls of the S-shaped sealing ring retaining ring, different specifications of sealing rings are installed in the grooves, and the installation is used for preventing oil and gas overflow and external substances from entering the internal production channel of the tubing hanger.

[0016] The underwater dual-electric pump tubing hanger system preferably, a tubing hanger running tool positioning key groove, a setting ring guide groove, an S-shaped sealing ring groove, a running tool and tubing hanger sealing test horizontal interface, an electro-hydraulic penetrator panel, a positioning key groove, a setting shoulder, a metal sealing cladding layer, a metal sealing retaining ring thread, a separation ring groove, a bottom retaining ring thread, and a field connectable wet electrical joint test thread hole are arranged on the outer wall of the tubing hanger body.

[0017] The underwater dual-electric pump tubing hanger system preferably, a running tool sealing cladding layer, a running tool ACME connection thread, an upper plug locking groove, an upper plug sealing cladding layer, a lower plug locking groove, a lower plug sealing cladding layer, a horizontal production channel, and a JFE special thread buckle are arranged in the tubing hanger body.

[0018] Preferably, the lower part of the tubing hanger body is further provided with a separation ring and a bottom retaining ring, the separation ring is two semicircular rings installed in the separation ring groove, and the bottom retaining ring is installed below the S-shaped sealing ring retaining ring for fastening the S-shaped sealing ring retaining ring.

[0019] The second aspect of the present application provides an underwater dual electric pump tubing hanger system, comprising the underwater dual electric pump tubing hanger of any one of the above, further comprising an external sleeve and a Christmas tree main valve block, which are fastened and connected, the external sleeve is equipped with a wet electrical connector and a cable, the Christmas tree main valve block is provided with an inner tree cap, the inner tree cap is provided with a phase separation wet connector which is engaged with the phase separation wet plug, and the cable penetrates through the phase separation wet connector and the phase separation wet plug to the underwater electric pump for power supply.

[0020] The present application has the following advantages due to the above technical scheme:

[0021] 1. The tubing hanger of the present application adopts six-way electrical connectors for penetration, which respectively supplies power to two underwater electric pumps, when one of the electric pumps fails, the standby electric pump is started to avoid complicated well repair operations, and the economic and time benefits are greatly improved.

[0022] 2. The upper and lower metal sealing rings of the present application have a V-shaped cross section, and the inner and outer rings have a certain interference amount, which can realize the sealing of the inner and outer rings in the radial direction, and can withstand high pressure in the axial direction to realize the sealing of the produced liquid (gas). The upper metal sealing ring is installed downward at the position of the tubing hanger metal sealing cladding layer, and the lower metal sealing ring is installed upward, and the middle is supported by a metal sealing bushing which is fixed by a metal sealing bushing fastening screw to prevent rotation.

[0023] 3. The bottom of the tubing hanger body is provided with an S-shaped sealing ring retaining ring, the S-shaped sealing ring retaining ring is sleeved on the S-shaped sealing ring retaining ring on the tubing hanger body, and the S-shaped sealing ring retaining ring is sleeved on the outer edge of the separation ring to prevent the separation ring from falling off. An S-shaped sealing ring retaining ring is further installed on the outer edge of the S-shaped sealing ring retaining ring, which can be used as a backup sealing ring when the lower metal sealing ring fails. The bottom retaining ring is installed below the S-shaped sealing ring retaining ring for fastening the S-shaped sealing ring retaining ring. Above the upper metal sealing ring, three S-shaped sealing ring retaining rings are installed on the tubing hanger body for sealing the annular space at the panel of the electro-hydraulic crossing device, which can also be used as a backup seal after the upper metal sealing ring fails. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The schematic diagram of the dual electric pump tubing hanger system provided by an embodiment of the present application is shown in the figure;

[0025] Figure 2 A schematic diagram of a dual-electric pump tubing hanger assembly provided for this embodiment of the present application;

[0026] Figure 3 A schematic diagram of the distribution of dual-electric pump electrical sub provided for this embodiment of the present application in a tubing hanger;

[0027] Figure 4 A schematic diagram of a dual-electric pump tubing hanger assembly provided for this embodiment of the present application from another angle;

[0028] The various marks shown in the drawings are as follows:

[0029] 1 - wet connector; 2 - outer sleeve; 3 - Christmas tree main valve block; 4 - external positioning key; 5 - first positioning key; 6 - tubing hanger body; 7 - electrical cable; 8 - inner tree cap; 9 - phase-splitting wet connector; 10 - phase-splitting wet plug; 11 - cable seal; 12 - internal cable passage; 13 - bottom cable connector; 14 - setting ring; 15 - lifting ring; 16 - sealing ring; 17 - sealing ring; 18 - second positioning key; 19 - upper metal sealing ring; 20 - metal sealing bushing; 21 - lower metal sealing ring; 22 - metal sealing retaining ring; 23 - threaded ring; 24 - S-shaped sealing ring retaining ring. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application are described below clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the usual meaning understood by those skilled in the art. The terms "first", "second", "third", "fourth" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, but do not exclude other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0032] This invention addresses the problem that existing tubing hangers only have one electrical circuit to drive one submersible electric pump, and that well workover operations are required when the submersible electric pump fails, which is very cumbersome. It proposes a dual-pump submersible tubing hanger system. This tubing hanger uses a six-way electrical connector to supply power to two submersible electric pumps. When one pump fails, the other backup pump is activated, avoiding cumbersome well workover operations and greatly improving economic and time efficiency.

[0033] The technical solution of the present invention will be described in detail below with reference to specific examples.

[0034] like Figure 1 , 2 As shown, the underwater dual-pump tubing hanger of the present invention includes: a tubing hanger body 6, with a lifting ring 15 at the top of the tubing hanger body 6, the lifting ring 15 being conveyed to the interior of the main valve block 3 of the wellhead via a feeding tool; a phase-separated wet plug 10, installed at the top of the tubing hanger body 6, the phase-separated wet plug 10 including six circuits, three circuits per group, respectively supplying three-phase power to two underwater electric pumps; an internal cable channel 12, located below the phase-separated wet plug 10, with a cable seal 11 at the top of the internal cable channel 12 for sealing connection with the phase-separated wet plug 10; and a bottom cable connector 13, located below the internal cable channel 12, for transmitting the power provided by the phase-separated wet plug 10 to the downstream electric pump, while providing sealing isolation for the internal cable channel 12.

[0035] In some preferred embodiments of the present invention, such as Figure 4 As shown, the tubing hanger body 6 also includes a setting ring 14 and a sealing ring 16. The setting ring 14 is sleeved on the outside of the lifting ring 15, and the sealing ring 16 is located below the setting ring 14. The outer wall of the setting ring 14 is provided with teeth that are adapted to the grooves in the main valve block 3 of the Christmas tree. After the tubing hanger is installed in place in the main valve block 3 of the Christmas tree, a certain downward pressure is applied to the setting ring 14, causing the setting ring 14 to move downward. The sealing ring 16 is squeezed outward by the setting ring 14, and the teeth of the sealing ring 14 fully engage with the grooves in the main valve block 3 of the Christmas tree, fixing the tubing hanger inside the main valve block 3 of the Christmas tree.

[0036] The lifting ring 15 is connected to the tubing hanger via threads. The lifting ring 15 has an annular groove structure inside, which engages with the sealing ring corresponding to the delivery tool. By lifting the combination of the delivery tool and the tubing hanger, the tubing hanger is delivered into the main valve block 3 of the Christmas tree.

[0037] Further, the outer wall of the tubing hanger body 6 is provided with a second positioning key 18, which is fastened to the tubing hanger body 6, and a key groove is formed in the inner wall of the channel of the Christmas tree main valve block 3, and the second positioning key 18 is engaged with the key groove in the inner wall of the channel of the Christmas tree main valve block 3, so as to ensure that the angle of the tubing hanger body 6 in the channel of the Christmas tree main valve block 3 is unique, thereby ensuring that the tubing hanger is accurately matched with the electro-hydraulic penetrator. More preferably, the outer part of the tubing hanger body 6 is provided with a groove, and the sealing ring 17 is installed in the outer groove of the tubing hanger body 6 to provide sealing for the tubing hanger and isolate external foreign matters.

[0038] Further, the lower part of the tubing hanger body 6 is provided with a metal sealing bushing 20, an upper metal sealing ring 19 located above the metal sealing bushing 20, and a lower metal sealing ring 21 located below the metal sealing bushing 20, and the metal sealing bushing 20 is used to support the upper metal sealing ring 19 and the lower metal sealing ring 21. The upper metal sealing ring 19 and the lower metal sealing ring 21 isolate the oil and natural gas produced by the Christmas tree from external matters, so as to prevent the oil and natural gas from overflowing to the outside of the Christmas tree. The body of the upper metal sealing ring 19 and the lower metal sealing ring 21 is plated with silver to avoid corrosion by oil and natural gas.

[0039] Further, the lower part of the tubing hanger body 6 is further provided with a metal sealing retaining ring 22, a threaded ring 23, and an S-shaped sealing ring retaining ring 24, the metal sealing retaining ring 22 is installed below the lower metal sealing ring 21, and the S-shaped sealing ring retaining ring 24 is installed between the metal sealing retaining ring 22 and the threaded ring 23.

[0040] The cross section of the upper metal sealing ring 19 and the lower metal sealing ring 21 is V-shaped, and the inner and outer rings have a certain amount of interference, which can realize the sealing of the inner and outer rings in the radial direction, and the positive direction in the axial direction can withstand high pressure to realize the sealing of the produced fluid (gas). The upper metal sealing ring 19 is installed with the opening downward at the position of the metal sealing build-up layer of the tubing hanger body 6, the lower metal sealing ring 21 has the opening upward, and the middle part is supported by the metal sealing bushing 20, which is fixed by the metal sealing bushing set screw to prevent rotation. The metal sealing bushing 20 is a ring with a hole on one side, and the circular hole is concentric with the horizontal production channel of the tubing hanger body 6 during installation. The metal sealing retaining ring 22 is installed at the lower part of the lower metal sealing ring 21 through the metal sealing retaining ring screw, and is used to lock the upper and lower metal sealing rings and the metal sealing bushing 20.

[0041] The bottom of the tubing hanger body 6 is provided with two S-shaped seal ring retaining rings 24. The outer S-shaped seal ring retaining ring 24 is sleeved on the inner S-shaped seal ring retaining ring 24 on the tubing hanger body 6, and is sleeved on the outer edge of the separation ring to prevent the separation ring from falling off. The outer edge of the inner S-shaped seal ring retaining ring 24 is further provided with an S-shaped seal ring retaining ring 24, which can be used as a backup seal ring when the lower metal seal ring 21 fails. The bottom retaining ring is installed below the S-shaped seal ring retaining ring 24 and is used to fasten the S-shaped seal ring retaining ring 24. Above the upper metal seal ring 19, three S-shaped seal ring retaining rings 24 are installed on the tubing hanger body 6, which are used to seal the annular space at the electro-hydraulic crossing panel and can also be used as backup seal rings after the upper metal seal ring 19 fails.

[0042] Further, grooves are arranged on the inner and outer sidewalls of the S-shaped seal ring retaining ring 24 for installing seal rings of different specifications to prevent oil and gas from overflowing and external substances from entering the internal production channel of the tubing hanger.

[0043] Further, the threaded ring 23 is provided with internal threads, which are installed with external threads at the lower part of the tubing hanger. The threaded ring 23 is tightened to fix the upper metal seal ring 19, the lower metal seal ring 21, the metal seal bushing 20, the metal seal retaining ring 22, and the S-shaped seal ring retaining ring 24.

[0044] In some preferred embodiments of the present application, the outer wall of the tubing hanger body 6 is provided with a tubing hanger running tool positioning key groove, a setting ring guide groove, an S-shaped seal ring groove, a running tool and tubing hanger seal test horizontal interface, an electro-hydraulic crossing panel, a positioning key groove, a setting shoulder, a metal seal hardfacing layer, a metal seal retaining ring thread, a separation ring groove, a bottom retaining ring thread, and a field connectable wet electrical connector test threaded hole. The electro-hydraulic crossing panel includes a blanking plug seal test threaded hole, a downhole chemical injection connector threaded hole, a downhole safety valve control line horizontal connector threaded hole, two electro-hydraulic crossing guide bushing mounting holes, two backup blind holes, and a horizontal electrical connector horizontal threaded hole.

[0045] Further, the top of the tubing hanger body 6 is provided with a running tool and tubing hanger seal test top threaded hole, an upper metal seal leakage monitoring threaded hole, a lower metal seal leakage monitoring threaded hole, a downhole safety valve control line top connector threaded hole, and two lifting threaded holes.

[0046] Further, the bottom of the tubing hanger body 6 is provided with a field connectable wet electrical connector bottom threaded hole, a chemical injection connector bottom threaded hole, a downhole safety valve control line connector bottom threaded hole, eight positioning pin holes, and two lifting threaded holes.

[0047] Further, the inner part of the tubing hanger body 6 is provided with a tool seal hardfacing layer, a tool ACME connection thread, an upper plug lock groove, an upper plug seal hardfacing layer, a lower plug lock groove, a lower plug seal hardfacing layer, a horizontal production passage and a JFE special thread box.

[0048] Further, the lower part of the tubing hanger body 6 is further provided with a parting ring and a bottom retaining ring, the parting ring is a two half ring installed in the parting ring groove, and the bottom retaining ring is installed below the S-shaped seal ring retaining ring 24 for fastening the S-shaped seal ring retaining ring 24.

[0049] The second aspect of the present application provides an underwater dual electric pump tubing hanger system, comprising the underwater dual electric pump tubing hanger of any one of the above, further comprising an external sleeve 2 and a Christmas tree main valve block 3, which are fastened and connected, the external sleeve 2 is provided with a wet electrical connector 1 and a cable 7, the Christmas tree main valve block 3 is provided with an inner tree cap 8, the inner tree cap 8 is provided with a phase separation wet connector 9 engaged with a phase separation wet plug 10, and the cable 7 penetrates through the phase separation wet connector 9 and the phase separation wet plug 10 to the underwater electric pump for power supply.

[0050] Further, the tubing hanger body 6 and the inner tree cap 8 are precisely positioned by the first positioning key 5, at this time, the phase separation wet connector 9 and the phase separation wet plug 10 are precisely engaged, realizing that the upper cable 7 penetrates through the tubing hanger body 6 to the underwater electric pump. The external sleeve 2 and the Christmas tree main valve block 3 are positioned by the external positioning key 4, ensuring that the cable 7 is accurately connected with the inner tree cap 8, and the power supply at the wet electrical connector 1 is transmitted downstream through the inner tree cap 8.

[0051] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A subsea dual-electric pump tubing hanger, characterized by, The oil tube hanger body (6) is provided with a lifting ring (15) at the top, which is conveyed into the oil tree main valve block (3) by a running-in tool. A phase separation wet plug (10) is installed at the top of the oil tube hanger body (6), which includes six circuits, three for each group, respectively providing three-phase power supply for two underwater electric pumps; An internal cable channel (12) is arranged below the phase separation wet plug (10), and the top of the internal cable channel (12) is provided with a cable sealing element (11) for sealing connection with the phase separation wet plug (10); A bottom cable joint (13) is arranged below the internal cable channel (12) for transmitting the power supply provided by the phase separation wet plug (10) to the downstream electric pump; It also includes a setting ring (14) and a sealing ring (16), the setting ring (14) is sleeved outside the lifting ring (15), the sealing ring (16) is located below the setting ring (14), and the outer wall of the setting ring (14) is provided with teeth matched with the groove in the oil tree main valve block (3). The outer wall of the oil tube hanger body (6) is provided with a second positioning key (18), which is tightly connected with the oil tube hanger body (6), and the channel inner wall of the oil tree main valve block (3) is provided with a key groove, and the second positioning key (18) is engaged with the channel inner wall key groove of the oil tree main valve block (3).

2. The subsea dual-electric pump tubing hanger of claim 1, wherein, The lower part of the oil tube hanger body (6) is provided with a metal sealing bushing (20), an upper metal sealing ring (19) above the metal sealing bushing (20), and a lower metal sealing ring (21) below the metal sealing bushing (20), and the metal sealing bushing (20) is used to support the upper metal sealing ring (19) and the lower metal sealing ring (21).

3. The subsea dual-electric pump tubing hanger of claim 1, wherein, The lower part of the oil tube hanger body (6) is also provided with a metal sealing retaining ring (22), a threaded ring (23) and an S-shaped sealing ring retaining ring (24), the metal sealing retaining ring (22) is installed below the lower metal sealing ring (21), and the S-shaped sealing ring retaining ring (24) is installed between the metal sealing retaining ring (22) and the threaded ring (23).

4. The subsea dual-electric pump tubing hanger of claim 3, wherein, The inner and outer sidewalls of the S-shaped sealing ring retaining ring (24) are provided with grooves for installing sealing rings of different specifications to prevent oil and gas overflow and external substances from entering the internal production channel of the oil tube hanger.

5. The subsea dual-electric pump tubing hanger of claim 4, wherein, The outer wall of the oil tube hanger body (6) is provided with an oil tube hanger running-in tool positioning key groove, a setting ring guide groove, an S-shaped sealing ring groove, a running-in tool and oil tube hanger sealing test horizontal interface, an electro-hydraulic penetrator panel, a positioning key groove, a setting shoulder, a metal sealing cladding layer, a metal sealing retaining ring thread, a separation ring groove, a bottom retaining ring thread and a field connectable wet electrical joint test thread hole.

6. The subsea dual-electric pump tubing hanger of claim 5, wherein, ​ 7. The subsea dual-electric pump tubing hanger of claim 6, wherein, The inner part of the tubing hanger body (6) is provided with a running tool sealing hardfacing layer, a running tool ACME connection thread, an upper packer locking groove, an upper packer sealing hardfacing layer, a lower packer locking groove, a lower packer sealing hardfacing layer, a horizontal production passage and a JFE special thread make-up.

8. The subsea dual-electric pump tubing hanger of claim 7, wherein, The lower part of the tubing hanger body (6) is further provided with a parting ring and a bottom retaining ring, the parting ring is a two half ring installed in the parting ring groove, and the bottom retaining ring is installed below the S-shaped sealing ring retaining ring (24) for fastening the S-shaped sealing ring retaining ring (24).

9. A subsea dual-electric pump tubing hanger system, characterized by, The underwater dual electric pump tubing hanger comprises the underwater dual electric pump tubing hanger, an external sleeve (2) and a Christmas tree main valve block (3), the external sleeve (2) and the Christmas tree main valve block (3) are fastened and connected, the external sleeve (2) is provided with a wet electric connector (1) and a cable (7), the Christmas tree main valve block (3) is provided with an inner tree cap (8), the inner tree cap (8) is provided with a phase separation wet connector (9) engaged with a phase separation wet plug (10), and the cable (7) penetrates through the phase separation wet connector (9) and the phase separation wet plug (10) to an underwater electric pump for power supply.

Images