CN102410391A - Real-time throttling device and method for eliminating severe slugging of gathering-riser system - Google Patents
Real-time throttling device and method for eliminating severe slugging of gathering-riser system Download PDFInfo
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- CN102410391A CN102410391A CN2011102167481A CN201110216748A CN102410391A CN 102410391 A CN102410391 A CN 102410391A CN 2011102167481 A CN2011102167481 A CN 2011102167481A CN 201110216748 A CN201110216748 A CN 201110216748A CN 102410391 A CN102410391 A CN 102410391A
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Abstract
The invention provides a real-time throttling device and a real-time throttling method for eliminating the severe slugging of a gathering-riser system. The real-time throttling device comprises a PID (proportional-integral-derivative) logical operation module, a throttle valve and pressure sensors; the throttle valve is arranged on the outlet end of a riser of the gathering-riser system, the pressure sensors are sensors which are respectively positioned on the landing end of an FPSO (Floating Production Storage and Offloading) and the offshore end of a wellhead platform, the throttle valve is positioned downstream relative to the FPSO landing end pressure sensor, and an outlet gas flowmeter is arranged downstream relative to the throttle valve; the real-time throttling device further comprises a main regulation module, a correcting regulation module, a real-time landing pressure control module and a real-time offshore pressure control module, which are used for monitoring the output signals of the throttle valve, the sensors and the gas flowmeter. The invention adopts the offshore pressure of the wellhead platform and the landing pressure of the FPSO as bases for regulating the throttle valve to inhibit and eliminate severe slugging.
Description
Technical field
The present invention relates to a kind of real-time throttling method that collects defeated-riser systems serious slug flow of eliminating.
Background technique
In the offshore oil industrial field; The crude oil of wellhead platform is to be transported to Floating Production through submarine pipeline to store easing gear (Floating Production storage & Offloading; FPSO); And standpipe is the equipment that is used for Crude Oil Transportation to the offshore platform of seabed gathering line, because the depth of water of marine oil field can reach hundreds of rice even a few km, often it is designed to stretched wire type or S type structure.For reduction transports cost, oil and natural gas is the normal defeated mode of mixing that adopts in submarine pipeline.When the gas-liquid flow velocity was low, the oil in the gathering line of seabed can accumulate in the bottom of standpipe, and the prevention rock gas gets into standpipe and it is compressed in the gathering line of the upper reaches.Increase along with the hydrops amount; Liquid level in the standpipe constantly raises; The pressure that is compressed rock gas increases, and when its pressure was enough big, a large amount of gases just can get into standpipe fast; And the liquid plug that promotes in the pipe sprays fast, and this gas that occurs in the riser systems is called as the serious slug flow phenomenon with liquid periodicity phenomenon output, that follow the pressure fluctuation.
Serious slug flow is a kind of very harmful flow pattern, and it not only can cause the fluctuation of system pressure and output, also can produce very long liquid plug, causes separator separates difficult even exceed the Processing capacity of separator and overflow; Moreover, its high back pressure of causing can reduce the production capacity of oil reservoir; The gas-liquid of ejection also can produce equipment such as separators and impact at a high speed, causes sea pipe high vibration and aggravates corrosion on Equipment.The serious slug flow phenomenon has greatly endangered the safety in production and the stable operation of ocean platform, therefore, must take certain measure, eliminates or inhibition serious slug flow phenomenon.
The riser top throttling is the effective ways that suppress and eliminate serious slug flow.1999; SPE is numbered the meeting paper of 56461-MS and has reported the method for utilizing the asending pipe outlet throttling to eliminate serious slug flow; This method is an example with sea, Dunbar oil field, North Sea pipe; Use the adjusting foundation of the pressure signal of asending pipe bottom, make the asending pipe base pressure be stabilized in expected value as the stand-pipe output throttle valve.No. the 200510042681.9th, Chinese invention patent; Denomination of invention is: valve throttle dynamic control method (the open date: on November 23rd, 2005) announced a kind of dynamic throttling controlling method of eliminating serious slug flow of eliminating serious slug flow; This method serves as to regulate foundation with riser bottom pressure mainly; Through regulating the aperture of throttle valve, the riser bottom pressure surge is stabilized in the desired range of values.
Yet in offshore oil, the oil field that has been constructed and put into operation usually only is provided with sensors such as pressure and temperature at the following bank end of wellhead platform and the disembarkation end of FPSO, and the flowing information in the submarine pipeline is not monitored.Because sub sea conditions is complicated unusually; Sea pipe cost is very expensive; By sea pipe sensor installation acquisition pipe internal pressure is infeasible often under water; Above-mentioned throttling technology is restricted in actual applications, therefore must develops a kind of existing pressure signal in oil field that can use as the real-time throttling arrangement and the method for regulating foundation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of real-time throttling method that collects defeated-riser systems serious slug flow of eliminating; With the disembarkation pressure of the following bank pressure of wellhead platform and FPSO adjusting foundation as the throttle valve valve; Pass through controlling opening of valve; Can be with the following bank pressure and the fluctuating range thereof of wellhead platform; Disembarkation pressure and the fluctuating range thereof of FPSO, and exit gas flowed fluctuation amplitude is reduced to and is stabilized in its rational expected value, thus reach the purpose that suppresses and eliminate serious slug flow.
The present invention eliminates the real-time throttling arrangement that collects defeated-riser systems serious slug flow, comprises PID logical operation module, throttle valve and pressure transducer; Said throttle valve is located at the stand-pipe output end that collects defeated-riser systems; Said pressure transducer comprises bank end pressure sensor under FPSO disembarkation end pressure sensor that is positioned at FPSO disembarkation end and the wellhead platform that is positioned at bank end under the wellhead platform; Said throttle valve is positioned at the downstream of FPSO disembarkation end pressure sensor; Said PID logical operation module is calculated the valve opening regulated value with wellhead platform pressure and FPSO disembarkation pressure characteristic, instructs the action of throttle valve.
The comprehensive main regulation module of said PID logical operation module, correction adjustment module, the real-time control module of disembarkation pressure; And the real-time control module of following bank pressure is regulated the opening value of throttle valve; Throttle valve is instructed; Wherein, said main regulation module serves as to regulate according to regulating with the fluctuating range of bank pressure under the wellhead platform, and said correction adjustment module serves as to regulate according to regulating with bank pressure maximum value under the wellhead platform; The real-time control module of said disembarkation pressure serves as to regulate according to regulating with FPSO disembarkation pressure mean values, and the said real-time control module of bank pressure down serves as to regulate according to regulating with bank end pressure mean value under the wellhead platform;
At least comprise a complete slug flow cycle cycle time of said main regulation module;
Above-mentioned elimination collection is defeated-and the throttling method of the real-time throttling arrangement of riser systems serious slug flow is: and gather the output signal of bank end pressure sensor under the wellhead platform, FPSO disembarkation end pressure sensor, throttle valve and exit gas flowmeter, the mean value of the maximum value through calculating bank pressure under the fluctuating range that obtains bank pressure under the wellhead platform, the wellhead platform, the mean value of FPSO disembarkation pressure and wellhead platform pressure is regulated the opening value of throttle valve on this basis.
Above-mentioned elimination collection is defeated-and the throttling method of the real-time throttling arrangement of riser systems serious slug flow may further comprise the steps:
(1) judges whether the pressure and the outlet gas flow that collect defeated-riser systems transfinite, if transfinite, then the controlling opening of valve value is safe aperture, if do not transfinite, then executed in parallel step (2) is to step (5);
(2) start the cycle timing of main regulation module, gather the output signal of bank pressure transducer (5) under the wellhead platform simultaneously, storage, after the cycle period of main regulation module finishes, statistical computation should be in the cycle fluctuating range PV of bank pressure under the wellhead platform
1, then according to this fluctuating range PV
1Calculate first aperture regulated value (Z of throttle valve valve
1(t));
(3) start the cycle timing of correcting module, gather the output signal of bank end pressure sensor (5) under the wellhead platform simultaneously, storage, after the cycle period of correcting module finishes, statistical computation should be in the cycle maximum value (PV of bank pressure under the wellhead platform
2), according to second aperture regulated value (Z of this maximum value calculation throttle valve valve
2(t));
(4) the cycle timing of the real-time control module of startup disembarkation pressure; Gather the output signal of FPSO disembarkation end pressure sensor (6) simultaneously; Storage, after the cycle period of disembarkation pressure real-time control module finishes, statistical computation should be in the cycle mean value (PV of FPSO disembarkation pressure
3), according to the 3rd aperture regulated value (Z of this mean value calculation throttle valve valve
3(t));
(5) start the cycle timing of the real-time control module of bank pressure down; Gather the output signal of bank end pressure sensor (5) under the wellhead platform simultaneously; Storage, after the cycle period of the real-time control module of bank pressure finishes instantly, statistical computation should be in the cycle mean value (PV of bank pressure under the wellhead platform
4), according to the 4th aperture regulated value (Z of this mean value calculation throttle valve valve
4(t));
(6) calculate the total regulated value of throttle valve, this total regulated value equals above-mentioned four aperture regulated values (Z) sum;
(7) the total regulated value that step (6) is calculated converts analogue signal into, the opening value of control throttle valve.
Said throttle valve opening regulated value calculates according to following formula:
Wherein, Z
k(t) be the valve opening regulated value of respective modules; PV
kThe pressure parameter that collects for correspondence; SP
kExpected value for the corresponding pressure parameter; K
CkProportional gain for respective modules; T
IkIntegration time constant for respective modules; T
D3Derivative time constant for respective modules;
The cycle period of said main regulation module is 3600s;
The cycle period of said correcting module is 3600s;
The cycle period of the real-time control module of said disembarkation pressure is 600s;
The said cycle period of the real-time control module of bank pressure down is 1s.
The real-time throttling arrangement and the method for the present invention eliminates collection defeated-riser systems serious slug flow have the following advantages at least: the present invention is with the disembarkation pressure of the following bank pressure of wellhead platform and the FPSO adjusting foundation as the throttle valve valve; Pass through controlling opening of valve; Can be with the following bank pressure and the fluctuating range thereof of wellhead platform; Disembarkation pressure and the fluctuating range thereof of FPSO; And exit gas flowed fluctuation amplitude is reduced to and is stabilized in its rational expected value, thereby reaches the purpose that suppresses and eliminate serious slug flow.Compare for No. 200510042681.9 with Chinese invention patent; Do not use the pressure characteristic of submerged riser bottom is regulated; Be applicable to most of oil field, feasibility and popularizing prospect are stronger, better, because it is infeasible often to obtain the pipe internal pressure through sea pipe sensor installation under water.
Description of drawings
Fig. 1 for maxine atlas defeated-structural representation of S type compliant riser system and its controlling device;
Figure2 realize the flow chart of the real-time throttling of riser top valve for the present invention.
Each mark is following among the figure: 1: wellhead platform; 2:FPSO; 3: mixed transporting tube road, seabed; 4:S type compliant riser; 5: bank end pressure sensor under the wellhead platform; 6:FPSO disembarkation end pressure sensor; 7:FPSO disembarkation end throttle valve; The 8:FPSO disembarkation brings out the gas flowmeter; 9:FPSO crude Treatment and storage facilities; 10 sea level.
Embodiment
Below in conjunction with accompanying drawing, the present invention is eliminated the real-time throttling arrangement and the method that collect defeated-riser systems serious slug flow does detailed description:
The present invention eliminates the disembarkation pressure of following bank pressure and FPSO that the real-time throttling method of the riser top valve of the serious slug flow in offshore oil industrial field submarine oil gas gathering and transportation-riser systems uses wellhead platform as the adjusting foundation of valve; Pass through controlling opening of valve; Can be with the following bank pressure and the fluctuating range thereof of wellhead platform; Disembarkation pressure and the fluctuating range thereof of FPSO; And exit gas flowed fluctuation amplitude is reduced to and is stabilized in its rational expected value, thereby reaches the purpose that suppresses and eliminate serious slug flow.
The real-time throttling arrangement of serious slug flow comprises PID logical operation module, throttle valve and pressure transducer in elimination offshore oil industrial field submarine oil gas gathering and transportation-standpipe provided by the invention; The stand-pipe output end of said throttle valve is located at said collection defeated-riser systems, i.e. the disembarkation end of FPSO; The entry end of said pressure transducer is located at said collection respectively defeated-riser systems, promptly the following bank end of wellhead platform and said collection defeated-outlet end of riser systems, i.e. the disembarkation end of FPSO.
Real-time throttling method of the present invention serves as to regulate foundation with the following bank pressure of wellhead platform and the disembarkation pressure of FPSO; By a main regulation module; A correcting module, and the acting in conjunction of two short circle modules, the aperture of control valve; Make said collection defeated-entry end of riser systems, promptly the pressure surge amplitude of the following bank end of wellhead platform levels off to and is stabilized in its expected value.The adjusting foundation of each module is asked for an interview table 1 with the adjusting purpose:
Each module of table 1 and foundation thereof and adjusting purpose
| Module | Regulate foundation | Regulate purpose |
| Following bank pressure main regulation module | Following bank pressure surge amplitude | The surge suppressing amplitude |
| Following bank pressure correction module | Following bank pressure maximum value | Avoid excessive throttling |
| Disembarkation pressure real-time regulated module | The disembarkation pressure mean values | Suppress the fluctuation of outlet pressure and gas flow |
| Following bank pressure real-time regulated module | Following bank pressure mean values | Suppress the inlet pressure fluctuation in real time |
Wherein, the main regulation module is done " coarse adjustment ", plays main the adjusting, should comprise a complete slug flow cycle its cycle time at least; In slug flow eruption phase in stage and logical ball pigging operation period; After platform is received ball; The pipe outlet gas flow sharply rises in several minutes with the disembarkation end pressure, tends to cause combustion gas turbine to close down because of inlet pressure is too high, then can stablize gas flow according to the variation controlling opening of valve of throttling upstream pressure; For this reason, two short circle modules have been designed according to bank end pressure mean value and FPSO disembarkation end pressure mean value controlling opening of valve under the wellhead platform.The short circle module mainly plays " fine setting ", and this cycle time is very short, not only can be in time, fast valve opening is made suitable adjustment, and can also make disembarkation and following bank pressure be stabilized near the expected value as early as possible; When excessive throttling, the pipe pressure of plunging into the commercial sea can raise, can be near the value of closing down of wellhead platform when serious; Close down for avoiding excessive throttling to cause; Designed correcting module, this module uses the production of wellhead platform to close down force value as a reference, can in time make correction to excessive throttling.
See also shown in Figure 1, wherein, 1: wellhead platform; 2:FPSO; 3: mixed transporting tube road, seabed; 4:S type compliant riser; 5: bank end pressure sensor under the wellhead platform; 6:FPSO disembarkation end pressure sensor; 7:FPSO disembarkation end throttle valve; The 8:FPSO disembarkation brings out the gas flowmeter; 9:FPSO crude Treatment and storage facilities; 10 sea level.The present invention collects, and defeated-S type compliant riser system mainly comprises wellhead platform 1, mixed transporting tube road, seabed 3, the S type compliant riser 4 that connects successively by flow direction; And FPSO 2 forms; The disembarkation end of FPSO 2, promptly the outlet end of S type compliant riser 4 is connected with FPSO disembarkation end pressure sensor 6, the FPSO disembarkation holds throttle valve 7, FPSO disembarkation to bring out gas flowmeter 8, FPSO crude Treatment and storage facilities 9.Controlling device of the present invention comprises bank end pressure sensor 5 under the wellhead platform, FPSO disembarkation end pressure sensor 6, FPSO disembarkation end throttle valve 7.Bank end pressure sensor 5 is located at the following bank end of wellhead platform 1 under the wellhead platform, i.e. the entry end of the riser systems formed of seabed mixed transporting tube road 3 and S type compliant riser 4 is used for monitoring in real time the pressure of 1 time bank end of wellhead platform; FPSO disembarkation end pressure sensor 6 is located at the disembarkation end of FPSO 2, and promptly the outlet end of the seabed mixed transporting tube road 3 and the riser systems of S type compliant riser 4 compositions is used for monitoring in real time the pressure that FPSO 2 disembarkations are held; FPSO disembarkation end throttle valve 7 is located at the disembarkation end of FPSO 2, i.e. the outlet end of the riser systems formed of seabed mixed transporting tube road 3 and S type compliant riser 4 is positioned at the downstream of FPSO disembarkation end pressure sensor 6.Adjusting of the present invention is according to being 1 time bank end pressure of wellhead platform and FPSO 2 disembarkation end pressures, and controlled plant is the throttle valve 7 that is positioned at FPSO 2 disembarkation ends.
Above-mentioned elimination maxine atlas is defeated-the real-time throttling method of S type compliant riser system serious slug flow in, S type compliant riser 4 can also be stretched wire type compliant riser or erect riser; FPSO 2 disembarkation end throttle valve 7 can be ball valve or stop valve.
Real-time throttling method of the present invention serves as to regulate foundation with the following bank pressure of wellhead platform and the disembarkation pressure of FPSO, by a main regulation module, and a correcting module, and the acting in conjunction of two short circle modules, the aperture of control valve.Wherein, The main regulation module serves as to regulate foundation with the fluctuating range of bank pressure under the wellhead platform, does " coarse adjustment ", plays main the adjusting; Be 3600s (can do suitable adjustment according to the cycle of slug flow, but should comprise a complete mobile cycle at least) its cycle time; In slug flow eruption phase in stage and logical ball pigging operation period; After platform is received ball; The pipe outlet gas flow sharply rises in several minutes with the disembarkation end pressure, tends to cause combustion gas turbine to close down because of inlet pressure is too high, and not only can stablize gas flow according to the variation controlling opening of valve of throttling upstream pressure; Can also suppress the pressure surge of debarking; For this reason, designed the short circle module according to FPSO disembarkation end pressure mean value controlling opening of valve, its cycle period is 600s (can do suitable adjustment as required); Designed the short circle module according to bank pressure mean values controlling opening of valve under the wellhead platform, its cycle period is 1s (can do suitable adjustment as required), can play the effect of bank pressure under reduction and the stable wellhead platform.Two short circle modules mainly play " fine setting ", and cycle time is very short, can be in time, according to variation in pressure valve opening is made suitable adjustment apace; When excessive throttling, the pipe pressure of plunging into the commercial sea can raise, and can close down for avoiding excessive throttling to cause near the value of closing down of wellhead platform when serious, has designed correcting module, so that in time correction is made in excessive throttling.
Above-mentioned elimination maxine atlas of the present invention is defeated-and the real-time throttling method workflow of compliant riser device serious slug flow is referring to Fig. 2, and at first whether real-time judge system pressure and outlet gas flow transfinite, if transfinite, then automatically valve are reached the safe aperture of setting; If do not transfinite, then get into the module of four executed in parallel.
In the formula, Z
1(t) be the valve opening regulated value of module 1, PV
1Be the fluctuating range of 1 time bank pressure of wellhead platform, SP
1Be pressure surge amplitude expected value, Kc
1Be proportional gain, T
I1Be integration time constant, T
D1Be derivative time constant.
Module 2 is a correcting module, and read module 1 is stored in the output signal of bank end pressure sensor 5 under the wellhead platform in the buffer memory, counts the maximum value PV of 1 time bank pressure of wellhead platform in this cycle
2, and with expected value SP
2Compare,, then skip the PID computing module if both are equal; If both do not wait, then according to computes valve opening regulated value:
In the formula, Z
2(t) be the valve opening regulated value of module 2, PV
2Be 1 time bank pressure of wellhead platform maximum value, SP
2Be pressure expected value, Kc
2Be proportional gain, T
I2Be integration time constant, T
D2Be derivative time constant.
In the formula, Z
3(t) be the valve opening regulated value of module 3, PV
3Be FPSO 2 disembarkation pressure mean values, SP
3Be pressure expected value, Kc
3Be proportional gain, T
I3Be integration time constant, T
D3Be derivative time constant.
Module 4 is the real-time control module of bank pressure down, and read module 1 is stored in the output signal of bank end pressure sensor 5 under the wellhead platform in the buffer memory in real time, counts the average value P V of 1 time bank pressure of wellhead platform in this cycle
4, and with its expected value SP
4Compare,, then skip the PID computing module if both are equal; If both do not wait, then according to computes valve opening regulated value:
In the formula, z
4(t) be the valve opening regulated value of module 4, PV
4Be 1 time bank pressure mean values of wellhead platform, SP
4Be pressure expected value, Kc
4Be proportional gain, T
I4Be integration time constant, T
D4Be derivative time constant.
Under the acting in conjunction of above-mentioned four executed in parallel modules, actual valve opening regulated value is:
Z＝Z
1(t)+Z
2(t)+Z
3(t)+Z
4(t)
Program converts actual valve opening regulated value Z into analogue signal, gives the actuator of valve, instructs valve event.
Before program of the present invention came into operation, the following bank pressure of wellhead platform 1 was 2842kPa to the maximum, and minimum is 2005kPa, and middle pressure is 2423kPa, and the pressure surge amplitude is 33.3% to the maximum; After program of the present invention comes into operation, through control after a while, about 1300s; Flowing is able to stablize, and the following bank pressure of wellhead platform 1 is 2233kPa to the maximum, and minimum is 1862kPa; Middle pressure is 2047kPa, and the pressure surge amplitude can be stabilized in about 19.6%.It is thus clear that elimination maxine atlas of the present invention is defeated-and the real-time throttling method of riser systems serious slug flow can reach and reduce bank pressure under the wellhead platform, suppress the purpose of bank pressure surge down, thereby make serious slug flow be able to eliminate.
Before program of the present invention came into operation, the disembarkation pressure of FOSO 2 was 1526kPa to the maximum, and minimum is 594kPa, and middle pressure is 1060kPa, and pressure surge amplitude maximum can reach 60.9%; After program of the present invention came into operation, through control after a while, about 1300s, flowing was able to stablize, and the disembarkation pressure of FOSO 2 is 1213kPa to the maximum, and minimum is 743kPa, and middle pressure is 978kPa; And the pressure surge amplitude can be stabilized in about 38.6%.It is thus clear that elimination maxine atlas of the present invention is defeated-and the real-time throttling method of riser systems serious slug flow can also play and reduce disembarkation pressure, suppresses the effect of disembarkation pressure surge.
Before program of the present invention came into operation, the disembarkation of FOSO 2 brought out the gas flow and is 12577m to the maximum
3/ h, minimum is 3061m
3/ h, mean flowrate are 7819m
3/ h, and flowed fluctuation amplitude maximum can reach 75.6%; After program of the present invention came into operation, through control after a while, about 1300s, flowing was able to stablize, and the disembarkation of FOSO 2 brings out the gas flow and is 13175m to the maximum
3/ h, minimum is 5395m
3/ h, middle pressure are 9285m
3/ h; And the flowed fluctuation amplitude can be stabilized in about 59%, and the raising of minimum gas flow helps avoiding combustion gas turbine to stop production because of fuel shortage or changes burning diesel oil.It is thus clear that elimination maxine atlas of the present invention is defeated-and the real-time throttling method of riser systems serious slug flow can also play and reduce disembarkation and bring out the gas flow, suppresses the effect of flowed fluctuation.
Visible by experimental result, the present invention can realize real-time self-choke, reduces bank pressure and FPSO disembarkation pressure under the wellhead platform, suppresses its pressure surge amplitude, the effect of stabilization of export gas flow, thus can reach the purpose of eliminating and suppressing serious slug flow.
The above is merely one embodiment of the present invention; It or not whole or unique mode of execution; The conversion of any equivalence that those of ordinary skills take technological scheme of the present invention through reading specification of the present invention is claim of the present invention and contains.
Claims (10)
1. eliminate the real-time throttling arrangement that collects defeated-riser systems serious slug flow, it is characterized in that: comprise PID logical operation module, throttle valve (7) and pressure transducer; Said throttle valve (7) is located at the stand-pipe output end that collects defeated-riser systems; Said pressure transducer comprises bank end pressure sensor (5) under FPSO disembarkation end pressure sensor (6) that is positioned at FPSO disembarkation end and the wellhead platform that is positioned at bank end under the wellhead platform; Said throttle valve (7) is positioned at the downstream of FPSO disembarkation end pressure sensor (6); Said PID logical operation module is calculated the valve opening regulated value with wellhead platform pressure and FPSO disembarkation pressure characteristic, instructs the action of throttle valve.
2. elimination collection as claimed in claim 1 is defeated-the real-time throttling arrangement of riser systems serious slug flow; It is characterized in that: the comprehensive main regulation module of said PID logical operation module, correction adjustment module, the real-time control module of disembarkation pressure; And the real-time control module of following bank pressure is regulated the opening value of throttle valve; Throttle valve is instructed; Wherein, said main regulation module serves as to regulate according to regulating with the fluctuating range of bank pressure under the wellhead platform, and said correction adjustment module serves as to regulate according to regulating with bank pressure maximum value under the wellhead platform; The real-time control module of said disembarkation pressure serves as to regulate according to regulating with FPSO disembarkation pressure mean values, and the said real-time control module of bank pressure down serves as to regulate according to regulating with bank end pressure mean value under the wellhead platform.
3. elimination collection as claimed in claim 1 is defeated-the real-time throttling arrangement of riser systems serious slug flow, it is characterized in that: comprise a complete slug flow cycle cycle time of said main regulation module at least.
4. elimination collection as claimed in claim 1 is defeated-throttling method of the real-time throttling arrangement of riser systems serious slug flow; It is characterized in that: gather the output signal of bank end pressure sensor (5) under the wellhead platform, FPSO disembarkation end pressure sensor (6), throttle valve (7) and exit gas flowmeter (8), regulate the opening value of throttle valve (7) on this basis through the debark mean value of mean value and wellhead platform pressure of pressure of maximum value, the FPSO that calculates bank pressure under the fluctuating range that obtains bank pressure under the wellhead platform, the wellhead platform.
5. elimination collection as claimed in claim 4 is defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: may further comprise the steps:
(1) judges whether the pressure and the outlet gas flow that collect defeated-riser systems transfinite, if transfinite, then the controlling opening of valve value is safe aperture, if do not transfinite, then executed in parallel step (2) is to step (5);
(2) start the cycle timing of main regulation module, gather the output signal of bank pressure transducer (5) under the wellhead platform simultaneously, storage, after the cycle period of main regulation module finishes, statistical computation should be in the cycle fluctuating range PV of bank pressure under the wellhead platform
1, then according to this fluctuating range PV
1Calculate first aperture regulated value (Z of throttle valve valve
1(t));
(3) start the cycle timing of correcting module, gather the output signal of bank end pressure sensor (5) under the wellhead platform simultaneously, storage, after the cycle period of correcting module finishes, statistical computation should be in the cycle maximum value (PV of bank pressure under the wellhead platform
2), according to second aperture regulated value (Z of this maximum value calculation throttle valve valve
2(t));
(4) the cycle timing of the real-time control module of startup disembarkation pressure; Gather the output signal of FPSO disembarkation end pressure sensor (6) simultaneously; Storage, after the cycle period of disembarkation pressure real-time control module finishes, statistical computation should be in the cycle mean value (PV of FPSO disembarkation pressure
3), according to the 3rd aperture regulated value (Z of this mean value calculation throttle valve valve
3(t));
(5) start the cycle timing of the real-time control module of bank pressure down; Gather the output signal of bank end pressure sensor (5) under the wellhead platform simultaneously; Storage, after the cycle period of the real-time control module of bank pressure finishes instantly, statistical computation should be in the cycle mean value (PV of bank pressure under the wellhead platform
4), according to the 4th aperture regulated value (Z of this mean value calculation throttle valve valve
4(t));
(6) calculate the total regulated value of throttle valve, this total regulated value equals above-mentioned four aperture regulated values (Z) sum;
(7) the total regulated value that step (6) is calculated converts analogue signal into, the opening value of control throttle valve.
6. elimination collection as claimed in claim 5 is defeated-the real-time throttling method of riser systems serious slug flow, and it is characterized in that: said each module is calculated the regulated value of throttle valve opening according to following formula:
Wherein, Z
k(t) be the valve opening regulated value of respective modules; PV
kThe pressure parameter that collects for correspondence; SP
kExpected value for the corresponding pressure parameter; Kc
kProportional gain for respective modules; T
IkIntegration time constant for respective modules; T
D3Derivative time constant for respective modules.
7. elimination collection as claimed in claim 5 is defeated-the real-time throttling method of riser systems serious slug flow, and it is characterized in that: the cycle period of said main regulation module is 3600s.
8. elimination collection as claimed in claim 5 is defeated-the real-time throttling method of riser systems serious slug flow, and it is characterized in that: the cycle period of said correcting module is 3600s.
9. elimination collection as claimed in claim 5 is defeated-the real-time throttling method of riser systems serious slug flow, and it is characterized in that: the cycle period of the real-time control module of said disembarkation pressure is 600s.
10. elimination collection as claimed in claim 5 is defeated-the real-time throttling method of riser systems serious slug flow, and it is characterized in that: the said cycle period of the real-time control module of bank pressure down is 1s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110216748 CN102410391B (en) | 2011-08-01 | 2011-08-01 | Real-time throttling device and method for eliminating severe slugging of gathering-riser system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110216748 CN102410391B (en) | 2011-08-01 | 2011-08-01 | Real-time throttling device and method for eliminating severe slugging of gathering-riser system |
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|---|---|
| CN102410391A true CN102410391A (en) | 2012-04-11 |
| CN102410391B CN102410391B (en) | 2013-07-10 |
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| CN 201110216748 Active CN102410391B (en) | 2011-08-01 | 2011-08-01 | Real-time throttling device and method for eliminating severe slugging of gathering-riser system |
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| CN104807589A (en) * | 2015-04-17 | 2015-07-29 | 西安交通大学 | Online identification method for gas-liquid two-phase-flow flow pattern in gathering and transportation-vertical pipe system |
| CN104791604B (en) * | 2015-03-20 | 2017-10-20 | 西安交通大学 | A kind of method that dynamic control separator pressure suppresses serious slug flow |
| CN108107782A (en) * | 2017-12-18 | 2018-06-01 | 宁波三星医疗电气股份有限公司 | A kind of automatic control concurrent data acquisition method for electric power energy collecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565825A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气股份有限公司 | Detection method for judging pipe cleaning occasion of wet gas collecting and conveying pipe network |
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| CN104807589A (en) * | 2015-04-17 | 2015-07-29 | 西安交通大学 | Online identification method for gas-liquid two-phase-flow flow pattern in gathering and transportation-vertical pipe system |
| CN108107782A (en) * | 2017-12-18 | 2018-06-01 | 宁波三星医疗电气股份有限公司 | A kind of automatic control concurrent data acquisition method for electric power energy collecting device |
| US11708943B2 (en) | 2018-10-26 | 2023-07-25 | Xi'an Jiaotong University | Pre-alarming method, control method and control system for harmful flow pattern in oil and gas pipeline-riser system |
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