CN205823270U - A kind of annular pressure for deep seafloor well head is monitored and controls device - Google Patents
A kind of annular pressure for deep seafloor well head is monitored and controls device Download PDFInfo
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- CN205823270U CN205823270U CN201620571875.1U CN201620571875U CN205823270U CN 205823270 U CN205823270 U CN 205823270U CN 201620571875 U CN201620571875 U CN 201620571875U CN 205823270 U CN205823270 U CN 205823270U
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Abstract
A kind of annular pressure for deep seafloor well head is monitored and controls device, and including being arranged at the gas access of bottom of device, lower piston installed above at gas access, lower piston is connected with upper piston by connecting rod, is provided with buffer unit below upper piston；Device is provided with gas outlet；Being provided with pressure transducer at gas access, the outfan of pressure transducer connects PLC logic control element and connects upper piston by power set；When at gas access, the pressure of fluid is higher than the pressure upper limit value preset, fluid forces lower piston moves up, and enables flow through gas outlet and flows out, carries out pressure release；When annular pressure signal is less than the force value preset, in the case of pressure, spring force and the compression fluid provided at hydraulic pump is produced three kinds of standby pressure so that the fluid in device is carried out ftercompction by press-in casing annulus at gas access by lower piston；This utility model has simple in construction, convenient and practical, uncorruptible feature.
Description
Technical field
This utility model relates to a kind of well head annular pressure control apparatus, particularly to a kind of for deep seafloor well head
Annular pressure monitoring and control device.
Background technology
Being different from the dry type wellhead assembly of land and shallow water oil gas field, deep water hydrocarbon well wellhead assembly uses subsea production tree
And casing head.Owing to deep-sea oil gas casing structure is complicated, form multiple airtight annular space.But, on stream, temperature is imitated
The airtight annular space fluid expansion that should cause, produces annular pressure phenomenon with pressure, the safety of serious threat tubing string and wellbore integrity.
The domestic and international research for Oil/gas Well casing annulus pressure is mainly for land and shallow water hp-ht well, to deep water
The research of casing annular pressure is few, and pertinent literature is also mainly the research to casing annulus stress management measure.Due to seabed
The particularity of casing head device, can only carry out pressure release by 1/2 inch line and ftercompction controls A annular pressure, it is impossible to B,
C, D annular pressure is monitored and controls, and the method easily causes pipeline blocking, causes erroneous judgement；Existing apparatus can not be according to API
Sealing, the integrity of annular space are tested by RP 90 work flow；When huge discharge injects operation, annulus fluid shrinks to be made
Become annular pressure to decline, cause annular space that vacuum, and then oxygen intake occur, cause corrosion.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model aims to provide a kind of annular space for deep seafloor well head
Pressure monitoring and control device, can effectively solve pipeline blocking, the problem causing erroneous judgement, have operation simple in construction, side
Just practical, uncorruptible feature.
For achieving the above object, this utility model adopts the following technical scheme that
A kind of annular pressure for deep seafloor well head is monitored and controls device, including the fluid being arranged on bottom of device
Entrance 1, at fluid intake 1 lower piston 8 installed above, lower piston 8 is connected with upper piston 6 by connecting rod 7, upper piston 6 times
Side is provided with buffer unit, and being connected between described buffer unit with lower piston 8 has spring 12；At the side of device and spring 12
Correspondence position is provided with fluid issuing 13；Described fluid intake 1 is provided with pressure transducer 2, the outfan of pressure transducer 2
Connecting PLC logic control element 3, the outfan of PLC logic control element 3 connects upper piston 6 by power set.
Described power set include the hydraulic pump 4 being connected with the outfan of PLC logic control element 3, hydraulic pump 4 defeated
Go out end and connect hydraulic cylinder 5, in hydraulic cylinder 5, be configured with upper piston 6.
Described buffer unit includes being sequentially arranged at the stationary barrier 9 below upper piston 6 and active clapboard 11, fixing
It it is compressed gas 10 between dividing plate 9 and active clapboard 11；Connect below active clapboard 11 and have spring 12.
This utility model compared with prior art has the advantage that
1. subsea wellheads annular space can be monitored and control by this utility model in real time, it is achieved releasing pressure automatically function, reduces
Personnel labor intensity.
2. the casing annulus sealing of regulation, integrity test during this utility model can realize API RP 90 standard.And
When huge discharge injects operation, casing annulus ftercompction can be improved operation process tubing and casing safety coefficient, it is ensured that wellbore integrity.
3. this utility model uses spring-air pressure system as pressure buffer structure, hence it is evident that improve system response speed
Degree.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Fig. 2 is annular pressure monitoring and controls device and seabed casing head installation site schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, utility model is further described:
As shown in Figure 1: a kind of annular pressure for deep seafloor well head is monitored and controls device, including being arranged on device
The fluid intake 1 of bottom, at fluid intake 1 lower piston 8 installed above, lower piston 8 is connected with upper piston 6 by connecting rod 7,
Being provided with buffer unit below upper piston 6, being connected between described buffer unit with lower piston 8 has spring 12；Side at device
Face and spring 12 correspondence position are provided with fluid issuing 13；Described fluid intake 1 is provided with pressure transducer 2, pressure sensing
The outfan of device 2 connects PLC logic control element 3, and the outfan of PLC logic control element 3 connects upper living by power set
Plug 6.
Described power set include the hydraulic pump 4 being connected with the outfan of PLC logic control element 3, hydraulic pump 4 defeated
Go out end and connect hydraulic cylinder 5, in hydraulic cylinder 5, be configured with upper piston 6.
Described buffer unit includes being sequentially arranged at the stationary barrier 9 below upper piston 6 and active clapboard 11, fixing
It it is compressed gas 10 between dividing plate 9 and active clapboard 11；Connect below active clapboard 11 and have spring 12.
Pressure transducer 2 is for detection subsea wellheads casing annulus pressure in real time, and generates corresponding annular pressure signal.
Fluid issuing 13 is for when pressure at inlet is higher than the upper pressure limit value preset, and fluid can pass through pressure relief opening stream
Go out, thus carry out pressure release.
PLC logic control element 3 is for receiving the pressure signal of pressure transducer 2, further according to the pressure signal received
Contrast with default threshold pression value, when annular pressure signal is less than the threshold pression value preset, pass through booster body
Fluid in device is pressed into casing annulus by (hydraulic pump, hydraulic cylinder, piston, connecting rod, stationary barrier, compressed gas and spring)
In, carry out supercharging, during until annular pressure signal reaches default threshold pression value, close booster body, stop ftercompction.
As shown in Figure 2: casing head 17 is divided into upper and lower two parts, install additional in the middle of the casing head 17 annular pressure monitoring with
Control device, upper casing head, annular pressure monitoring and control device and trap and carry out even by mounting flange 16 between tube head
Connect, inside casing head 17, be respectively arranged with outer layer tubing string 14 and internal layer tubing string 19, outer layer tubing string 14 and internal layer tubing string 19 with
Casing head 17 contact position is separately installed with outer layer tubing string hanger 15 and internal layer tubing string hanger 18.
Operation principle of the present utility model:
1. releasing pressure automatically: when the pressure of fluid intake 1 fluid is higher than pressure upper limit value P presetmaxTime, under fluid forces
Piston 8 moves up, and enables flow through fluid issuing 13 and flows out, carries out pressure release.Lower piston 8 move up while compression spring
12, spring 12 makes again active clapboard 11 move up, and partial pressure passes to compressed gas 10, thus plays annular pressure
To the effect of buffering, protect casing safety.
2. ftercompction: the pressure of pressure transducer 2 convection cell entrance 1 detects in real time, and pressure transducer 2 is by pressure signal
Being sent to logic control element 3, pressure signal is carried out compared with control hydraulic pressure with the threshold pression value preset by logic control element 3
Pump 4, when annular pressure signal is less than the force value preset, starts hydraulic pump 4 and makes hydraulic cylinder 5 work, and hydraulic cylinder 5 promotes upper living
Plug 6 moves down, and upper piston 6 is connected with connecting rod 7 and lower piston 8, and connecting rod 7 promotes lower piston 8 to move down, and lower piston 8 is again
Making the spring 12 installed between active clapboard 11 and lower piston 8 stretch downwards, spring 12 pulls downward on active clapboard 11, movable every
Equipped with compressed gas 10 between plate 11 and stationary barrier 9, in pressure, spring 12 elastic force and compressed gas that hydraulic pump 4 is provided
In the case of being produced three kinds of standby pressure, common effect makes lower piston 8 that by fluid intake 1, the fluid in device is pressed into sleeve pipe
Annular space, thus carry out ftercompction.During until annular pressure signal reaches default threshold pression value, logic control element 3 controls to close
Close hydraulic pump 4, stop ftercompction.
Claims (3)
1. the annular pressure for deep seafloor well head is monitored and controls device, it is characterised in that include being arranged on device
The fluid intake (1) of bottom, in fluid intake (1) lower piston (8) installed above, lower piston (8) is by connecting rod (7) and upper work
Plug (6) is connected, and is provided with buffer unit in upper piston (6) lower section, and being connected between described buffer unit with lower piston (8) has bullet
Spring (12)；In the side of device, spring (12) correspondence position is provided with fluid issuing (13)；Described fluid intake (1) is installed
Having pressure transducer (2), the outfan of pressure transducer (2) connects PLC logic control element (3), PLC logic control element
(3) outfan connects upper piston (6) by power set.
A kind of annular pressure for deep seafloor well head the most according to claim 1 is monitored and controls device, its feature
Being, described power set include the hydraulic pump (4) being connected with the outfan of PLC logic control element (3), hydraulic pump (4)
Outfan connect configuration upper piston (6) in upper hydraulic cylinder (5), upper hydraulic cylinder (5).
A kind of annular pressure for deep seafloor well head the most according to claim 1 is monitored and controls device, its feature
Being, described buffer unit includes stationary barrier (9) and the active clapboard (11) being sequentially arranged at upper piston (6) lower section,
It is compressed gas (10) between stationary barrier (9) and active clapboard (11)；Connect in active clapboard (11) lower section and have spring (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620571875.1U CN205823270U (en) | 2016-06-14 | 2016-06-14 | A kind of annular pressure for deep seafloor well head is monitored and controls device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620571875.1U CN205823270U (en) | 2016-06-14 | 2016-06-14 | A kind of annular pressure for deep seafloor well head is monitored and controls device |
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| CN205823270U true CN205823270U (en) | 2016-12-21 |
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| CN201620571875.1U Active CN205823270U (en) | 2016-06-14 | 2016-06-14 | A kind of annular pressure for deep seafloor well head is monitored and controls device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840184A (en) * | 2016-06-14 | 2016-08-10 | 西安石油大学 | Annular space pressure monitoring and control device and method for deep sea seafloor wellhead |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
-
2016
- 2016-06-14 CN CN201620571875.1U patent/CN205823270U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840184A (en) * | 2016-06-14 | 2016-08-10 | 西安石油大学 | Annular space pressure monitoring and control device and method for deep sea seafloor wellhead |
| CN105840184B (en) * | 2016-06-14 | 2022-11-29 | 西安石油大学 | Device and method for monitoring and controlling annulus pressure of deep sea seabed wellhead |
| CN116163673A (en) * | 2023-04-25 | 2023-05-26 | 中国石油大学(华东) | Micro-pressure control device and method for deep water shallow gradient well cementation circulating wellhead |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |