CN102410391B - 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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- CN102410391B CN102410391B CN 201110216748 CN201110216748A CN102410391B CN 102410391 B CN102410391 B CN 102410391B CN 201110216748 CN201110216748 CN 201110216748 CN 201110216748 A CN201110216748 A CN 201110216748A CN 102410391 B CN102410391 B CN 102410391B
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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 by submarine pipeline to store easing gear (Floating Production storage﹠amp; Offloading, FPSO), and standpipe is for the Crude Oil Transportation of the seabed gathering line equipment to offshore platform, 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 enters standpipe and it is compressed in the gathering line of upstream.Increase along with the hydrops amount, liquid level in the standpipe constantly raises, the pressure of compressed rock gas increases, when its pressure is enough big, a large amount of gases just can enter standpipe fast, and the liquid plug that promotes in the pipe sprays fast, this occur in gas in the riser systems and liquid periodically phenomenon output, that follow the pressure fluctuation be called as the serious slug flow phenomenon.
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 the separator separation difficulty even exceeds 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 high speed ejection also can produce equipment such as separators impacts, and causes the extra large corrosion of managing high vibration and aggravating equipment.The serious slug flow phenomenon has greatly endangered 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 example with sea, Dunbar oil field, North Sea pipe, use the pressure signal of asending pipe bottom as the adjusting foundation of stand-pipe output throttle valve, make the asending pipe base pressure be stabilized in expected value.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, by 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 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 the FPSO adjusting foundation as the throttle valve valve, pass through controlling opening of valve, can be with 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 present invention eliminates the real-time throttling method that collects defeated-riser systems serious slug flow, and throttling arrangement comprises PID logical operation module, throttle valve and pressure transducer; Described throttle valve is located at the stand-pipe output end that collects defeated-riser systems, described pressure transducer comprises bank end pressure sensor under the 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, described throttle valve is positioned at the downstream of FPSO disembarkation end pressure sensor, described PID logical operation module is calculated the valve opening regulated value with bank pressure and FPSO disembarkation pressure characteristic under the wellhead platform, instructs the action of throttle valve;
The comprehensive main regulation module of described PID logical operation module, revise 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, described main regulation module serves as to regulate according to regulating with the fluctuating range of bank pressure under the wellhead platform, described 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 described disembarkation pressure serves as to regulate according to regulating with FPSO disembarkation pressure mean values, and the described real-time control module of bank pressure down serves as to regulate according to regulating with bank pressure mean values under the wellhead platform;
Eliminate collection defeated-the real-time throttling method of riser systems serious slug flow is: 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 bank pressure is regulated the opening value of throttle valve on this basis under the maximum value by 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 the wellhead platform;
Described throttling method specifically 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, the output signal of gathering bank pressure transducer 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 to revise the cycle timing of adjustment module, gather bank end pressure signal of sensor 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 FPSO disembarkation end pressure signal of sensor simultaneously, storage, after the cycle period of disembarkation pressure real-time control module finishes, statistical computation should be in the cycle average value P V 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 bank end pressure signal of sensor under the wellhead platform simultaneously, storage, instantly after the cycle period of the real-time control module of bank pressure finishes, statistical computation should the cycle in the average value P V4 of bank pressure under the wellhead platform, 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) total regulated value that step (6) is calculated is converted to analogue signal, the opening value of control throttle valve.
Described 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
DkDerivative time constant for respective modules;
The cycle period of described main regulation module is 3600s;
The cycle period of described correcting module is 3600s;
The cycle period of the real-time control module of described disembarkation pressure is 600s;
The described cycle period of the real-time control module of bank pressure down is 1s.
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 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 by sea pipe sensor installation acquisition pipe internal pressure is infeasible often under water.
Description of drawings
Fig. 1 for maxine atlas defeated-structural representation of S type compliant riser system and its controlling device;
Fig. 2 realizes the flow chart of the real-time throttling of riser top valve for the present invention;
Fig. 3 is before and after the control program effect of the present invention, to the influence of bank end pressure under the wellhead platform, and the time point that red vertical line begins to act on for control program of the present invention among the figure;
Fig. 4 is for before and after the control program effect of the present invention, to the influence of FPSO disembarkation end pressure, the time point that red vertical line begins to act on for control program of the present invention among the figure;
Fig. 5 is for before and after the control program effect of the present invention, and disembarkation brings out the influence of implication body flow, the time point that red vertical line begins to act on for control program of the present invention among the figure to FPSO.
Each mark is as follows 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 implication flowmeter body; 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 is described in detail:
The present invention eliminates 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 and uses the disembarkation pressure of the following bank pressure of wellhead platform and FPSO as the adjusting foundation of valve, pass through controlling opening of valve, can be with 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 described throttle valve is located at described collection defeated-riser systems, i.e. the disembarkation end of FPSO; The entry end of described pressure transducer is located at described collection respectively defeated-riser systems, namely the following bank end of wellhead platform and described 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, revise adjustment module for one, and two short circle modules acting in conjunction, the aperture of control valve, make described collection defeated-entry end of riser systems, namely 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 and adjusting purpose are asked for an interview table 1:
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 |
| The real-time adjustment module of disembarkation pressure | The disembarkation pressure mean values | Suppress the fluctuation of outlet pressure and gas flow |
| The real-time adjustment module of following bank pressure | 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, pipe outlet gas flow and disembarkation end pressure sharply rose in several minutes, tend to cause combustion gas turbine to close down because inlet pressure is too high, variation controlling opening of valve according to the throttling upstream pressure then can be stablized gas flow, for this reason, two short circle modules according to bank end pressure mean value and FPSO disembarkation end pressure mean value controlling opening of valve under the wellhead platform have been designed.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 implication flowmeter body; 9:FPSO crude Treatment and storage facilities; 10: the 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 FPSO2 forms, the disembarkation end of FPSO2, namely 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 implication flowmeter body 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, and namely the entry end of the riser systems of seabed mixed transporting tube road 3 and S type compliant riser 4 compositions is used for the pressure of 1 time bank end of monitoring wellhead platform in real time; FPSO disembarkation end pressure sensor 6 is located at the disembarkation end of FPSO2, and namely the outlet end of the riser systems of seabed mixed transporting tube road 3 and S type compliant riser 4 compositions is used for the pressure that monitoring FPSO2 disembarkation is in real time held; FPSO disembarkation end throttle valve 7 is located at the disembarkation end of FPSO2, 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 FPSO2 disembarkation end pressure, and controlled plant is the throttle valve 7 that is positioned at FPSO2 disembarkation end.
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; FPSO2 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 that 3600s(can do suitable adjustment according to the cycle of slug flow its cycle time, but should comprise a complete mobile cycle at least); In slug flow eruption phase in stage and logical ball pigging operation period, after platform is received ball, pipe outlet gas flow and disembarkation end pressure sharply rose in several minutes, tend to cause combustion gas turbine to close down because 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 that 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 that 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 change according to pressure in time, rapidly valve opening is made suitable adjustment; 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, in order 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 enter 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.
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.
Module 3 is the interval for the real-time control module of disembarkation pressure with its cycle period, and read module 1 is stored in the output signal of the FPSO disembarkation end pressure sensor 6 in the buffer memory, counts the average value P V of FPSO2 disembarkation pressure in this cycle
3, and with its expected value SP
3Compare, if both are equal, then skip the PID computing module; If both do not wait, then calculate the valve opening regulated value according to following formula:
In the formula, Z
3(t) be the valve opening regulated value of module 3, PV
3Be FPSO2 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, if both are equal, then skip the PID computing module; If both do not wait, then calculate the valve opening regulated value according to following formula:
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 is converted to analogue signal with actual valve opening regulated value Z, gives the actuator of valve, instructs valve event.
Fig. 3, Fig. 4, Fig. 5 verify the moment that the residing time point of red curve begins to act on for program of the present invention among the figure for the site test of effect of the present invention.As seen from Figure 3, 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, flow and stablized, the following bank pressure of wellhead platform 1 is 2233kPa to the maximum, and minimum is 1862kPa, and middle pressure is 2047kPa, and the pressure surge amplitude can be stabilized in about 19.6%.As seen elimination maxine atlas of the present invention defeated-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 serious slug flow is eliminated.
Fig. 4 for program of the present invention come into operation before and after the situation of change of FOSO2 disembarkation pressure.By this figure as seen, before program of the present invention came into operation, the disembarkation pressure of FOSO2 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 comes into operation, through control after a while, about 1300s, flow and stablized, the disembarkation pressure of FOSO2 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%.As seen elimination maxine atlas of the present invention defeated-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.
Fig. 5 for program of the present invention come into operation before and after FOSO2 disembarkation bring out the situation of change of implication body flow.By this figure as seen, before program of the present invention came into operation, the disembarkation of FOSO2 brought out implication body 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 comes into operation, through control after a while, about 1300s, flow and stablized, the disembarkation of FOSO2 brings out implication body 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 is conducive to avoid combustion gas turbine to stop production because of fuel shortage or changes burning diesel oil.As seen elimination maxine atlas of the present invention defeated-the real-time throttling method of riser systems serious slug flow can also play and reduce disembarkation and bring out implication body flow, suppresses the effect of flowed fluctuation.
By experimental result as seen, 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 only is 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 technical solution of the present invention by reading specification of the present invention is claim of the present invention and contains.
Claims (6)
1. eliminate the real-time throttling method that collects defeated-riser systems serious slug flow, it is characterized in that: throttling arrangement comprises PID logical operation module, throttle valve (7) and pressure transducer; Described throttle valve (7) is located at the stand-pipe output end that collects defeated-riser systems, described pressure transducer comprises bank end pressure sensor (5) under the 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, described throttle valve (7) is positioned at the downstream of FPSO disembarkation end pressure sensor (6), described PID logical operation module is calculated the valve opening regulated value with bank pressure and FPSO disembarkation pressure characteristic under the wellhead platform, instructs the action of throttle valve;
The comprehensive main regulation module of described PID logical operation module, revise 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, described main regulation module serves as to regulate according to regulating with the fluctuating range of bank pressure under the wellhead platform, described 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 described disembarkation pressure serves as to regulate according to regulating with FPSO disembarkation pressure mean values, and the described real-time control module of bank pressure down serves as to regulate according to regulating with bank pressure mean values under the wellhead platform;
Eliminate collection defeated-the real-time throttling method of riser systems serious slug flow is: 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 by the debark mean value of bank pressure under the mean value of pressure and the wellhead platform of maximum value, the FPSO that calculates bank pressure under the fluctuating range that obtains bank pressure under the wellhead platform, the wellhead platform;
Described throttling method specifically 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, the output signal of gathering 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 to revise the cycle timing of adjustment module, the output signal of gathering bank end pressure sensor (5) under the wellhead platform simultaneously, storage, after the cycle period of revising adjustment 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 average value P V 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 average value P V 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) total regulated value that step (6) is calculated is converted to analogue signal, the opening value of control throttle valve.
Elimination collection as claimed in claim 1 defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: described 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
DkDerivative time constant for respective modules.
Elimination collection as claimed in claim 1 defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: the cycle period of described main regulation module is 3600s.
Elimination collection as claimed in claim 1 defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: the cycle period of described correcting module is 3600s.
Elimination collection as claimed in claim 1 defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: the cycle period of the real-time control module of described disembarkation pressure is 600s.
Elimination collection as claimed in claim 1 defeated-the real-time throttling method of riser systems serious slug flow, it is characterized in that: the described 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102410391A CN102410391A (en) | 2012-04-11 |
| CN102410391B true CN102410391B (en) | 2013-07-10 |
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| CN104565825B (en) * | 2013-10-29 | 2017-11-10 | 中国石油天然气股份有限公司 | Detection method for judging pipe cleaning time of wet gas gathering and transportation pipe network |
| 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 |
| CN104807589B (en) * | 2015-04-17 | 2017-03-01 | 西安交通大学 | A kind of ONLINE RECOGNITION method collecting flow pattern of gas-liquid two-phase flow in defeated-riser systems |
| CN108107782B (en) * | 2017-12-18 | 2021-04-16 | 宁波三星医疗电气股份有限公司 | Self-control concurrent data acquisition method for electric power energy acquisition equipment |
| CN109458561B (en) | 2018-10-26 | 2023-07-07 | 西安交通大学 | Early warning method, control method and system for harmful flow pattern of oil and gas gathering and transportation vertical pipe system |
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