CN104613927A - Method for monitoring rotating angle of deep marine riser - Google Patents

Method for monitoring rotating angle of deep marine riser Download PDF

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Publication number
CN104613927A
CN104613927A CN201510082374.7A CN201510082374A CN104613927A CN 104613927 A CN104613927 A CN 104613927A CN 201510082374 A CN201510082374 A CN 201510082374A CN 104613927 A CN104613927 A CN 104613927A
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CN
China
Prior art keywords
marine riser
signal
axis
riser
tilt angle
Prior art date
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Pending
Application number
CN201510082374.7A
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Chinese (zh)
Inventor
盛磊祥
许亮斌
王荣耀
周建良
李迅科
邓欣
黎昵
陈实
王海燕
申晓红
李保军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZHANJIANG NANHAI WEST PETROLEUM PROSPECTING DESIGN CO Ltd
China National Offshore Oil Corp CNOOC
CNOOC Research Institute Co Ltd
Original Assignee
ZHANJIANG NANHAI WEST PETROLEUM PROSPECTING DESIGN CO Ltd
China National Offshore Oil Corp CNOOC
CNOOC Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by ZHANJIANG NANHAI WEST PETROLEUM PROSPECTING DESIGN CO Ltd, China National Offshore Oil Corp CNOOC, CNOOC Research Institute Co Ltd filed Critical ZHANJIANG NANHAI WEST PETROLEUM PROSPECTING DESIGN CO Ltd
Priority to CN201510082374.7A priority Critical patent/CN104613927A/en
Publication of CN104613927A publication Critical patent/CN104613927A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C1/00Measuring angles

Abstract

The invention relates to a method for monitoring a rotating angle of a deep marine riser. The method comprises the following steps: (1) setting a marine riser tilt angle monitoring system comprising a rotating angle detection system, an underwater acoustic signal receiving device and a data monitoring center; (2) mounting a double-axis tilt angle sensor at a preset position of the marine riser before the marine riser enters water, controlling the double-axis tilt angle sensor to start working by virtue of a controller after the marine riser reaches the subsea wellhead, measuring the included angles alpha and beta between the marine riser and the axis X and between the marine riser and the axis Y by virtue of the double-axis tilt angle sensor, transmitting the measured tilt angle signals alpha and beta to a DSP, calculating to acquire a rotating angle signal gamma of the marine riser by virtue of the DSP according to a preset formula, and processing the rotating angle of the marine riser so as to spread by virtue of an underwater acoustic channel; (3) lifting the underwater acoustic signal receiving device at a certain position below the sea surface to be used for receiving the rotating angle signal of the marine riser, and transmitting the signal to the data monitoring center; and (4) displaying and saving the rotating angle signal data of the marine riser received by the data monitoring center, so that the platform staff can determine the operating state according to the rotating angle information of the marine riser displayed by the data monitoring center.

Description

A kind of deep water riser corner monitoring method
Technical field
The present invention relates to oceanographic engineering and deep water oil field, particularly about a kind of deep water riser corner monitoring method being applicable to long service.
Background technology
In marine oil field, marine riser is the throat thoroughfare connecting subsea wellheads and operations offshore platform, and the corner of its bottom compliant joint is the important parameter of drilling operation.Ocean current, Platform movement etc. cause marine riser to offset and produce the angle with vertical direction, i.e. corner.In drilling process, corner must control in drilling operation safety enveloping line, if it exceedes safe range, then marine riser and inner drill rods rub, collide, and seriously jeopardize drilling safety.Therefore Real-Time Monitoring marine riser bottom comers data, in the monitoring of marine riser configuration state with assessment, verify and play an important role in design theory and Curve guide impeller specification etc.External employing inclination angle measurement method monitoring marine riser corner, and the detection of marine riser inclination data realizes primarily of double-shaft tilt angle sensor.Different with power supply mode according to data transmission, the marine riser inclined angle monitoring system that current engineering uses mainly is divided into independent monitoring systems, real-time monitoring system and acoustic monitoring system three class.
Independent monitoring systems is made up of datalogger and respective sensor, and datalogger comprises center processing unit, A/D converter, data-carrier store and other auxiliary elements, and these elements are all encapsulated in firm stainless steel casing.Datalogger and required sensor integration use, and monitoring system uses and carries battery-powered measurement, and data store in memory, and after measurement terminates, from storer, downloading data is analyzed to computing machine.Unit monitoring system adopts bandage and clip to attach it on marine riser, and read data after waiting marine riser to reclaim or adopt underwater robot (ROV) fetch data and change electric battery, the method cost is low, but cannot realize Real-Time Monitoring.During ROV sensor installation, due to the relative motion of winch, ROV and marine riser three, give and operation is installed also brings many difficulty.Real-time type monitoring system, power supply and data transmission are all realized by cable, and inclination data is real-time transmitted to data processing centre (DPC).Line arrangement can extend the angle of incidence under marine riser, and may damage, and is not suitable for deep water riser monitoring.Compared with unit monitoring system, the structure of real-time monitoring system, installation and interface are all very complicated, are not suitable for the monitoring of deep water riser.Acoustic monitoring system, utilizes water sound communication technique, completes the wireless transmission of inclination data, but current technology exists power consumption greatly, the problems such as life cycle is short.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of deep water riser corner monitoring method obtaining marine riser corner by detecting the inclination angle of marine riser in surface level, the method can not only reduce the power consumption of monitoring system, and can improve the life cycle of marine riser inclined angle monitoring system.
For achieving the above object, the present invention takes following technical scheme: a kind of deep water riser corner monitoring method, is characterized in that comprising following content: 1) arrange the marine riser inclined angle monitoring system that comprises roll angle inspection system, underwater sound signal receiving trap and data monitor center, roll angle inspection system comprises controller, double-shaft tilt angle sensor, DSP, source encoder, channel encoder, modulator, power amplifier, underwater sound transmitting transducer and power supply, underwater sound receiving trap comprises underwater sound receiving transducer, wave filter, power amplifier, detuner and demoder, 2) before marine riser enters water, double-shaft tilt angle sensor is installed in the precalculated position of marine riser, after marine riser arrives at subsea wellheads, controller transmit control double-shaft tilt angle sensor start working, double-shaft tilt angle sensor measures marine riser and angle α and β between X-axis and Y-axis, and be sent to DSP by measuring α and β obtained, DSP calculates the angular signal γ of marine riser according to preset formula, and the angular signal γ of marine riser is completed source coding and channel coding successively in source encoder and channel encoder, signal entering signal modulator after coding is modulated, and the signal after modulation is sent to power amplifier and carries out power amplification, the electric signal including marine riser corner information is converted to acoustical signal through underwater sound transmitting transducer and launches by the signal after power amplification by power amplifier, acoustical signal is propagated through underwater acoustic channel, wherein, with node flexible bottom marine riser for initial point, be Z axis straight up, X-axis and Y-axis were positioned at initial point and perpendicular to the plane of Z axis, 3) underwater sound signal receiving trap is hung be located at certain position, below sea, for receiving marine riser angular signal, be specially: the acoustical signal including marine riser corner information received from underwater acoustic channel is converted to electric signal and is sent to wave filter by underwater sound receiving transducer, wave filter is mingled in the interference noise in electric signal for filtering, filtered electric signal is sent to detuner and demoder successively after power amplifier amplifies to carry out demodulation code respectively and obtains marine riser corner data, and sends it to data monitor center, 4) data monitor center shows and preserves the marine riser corner data received, the marine riser corner information determination job state that working platform personnel show according to data control center.
Described step 2) in DSP calculate the angular signal γ of marine riser according to preset formula, specific formula for calculation is:
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention measures marine riser and angle α and β between X-axis and Y-axis by double-shaft tilt angle sensor, and the angular signal γ of marine riser is calculated by inclination angle signal α and β, compared with traditional two axial rakes, the present invention changes X-axis inclination angle and Y-axis inclination angle into Z axis inclination angle, therefore the present invention only needs the data of a transmission axle, makes data volume reduce 50%.2, because data volume of the present invention reduces, data transmission period decreases, and under same emissive power, lower power consumption, therefore under the constant condition of the energy content of battery, improves the life cycle of marine riser inclined angle monitoring system.In sum, the present invention has efficient, energy-conservation and that the life-span is long feature, can be widely used in the marine riser status monitoring of deep-marine-environment.
Accompanying drawing explanation
Fig. 1 is angle detection method principle schematic of the present invention;
Fig. 2 is marine riser inclined angle monitoring system scheme of installation of the present invention;
Fig. 3 is marine riser inclined angle monitoring system principle schematic of the present invention.
Embodiment
Below in conjunction with accompanying drawing, detailed description is carried out to the present invention.But should be appreciated that being provided only of accompanying drawing understands the present invention better, they not should be understood to limitation of the present invention.
At present, marine oil and gas drilling well marches to the marine site that 3000m is even darker.Compared with shoal water zone, deep-marine-environment is more severe, obvious along marine riser length direction fluid velocity size variation, increases marine riser distortion and produces larger displacement and corner, cause marine riser structure fatigue damage owing to expanding towing.The corner of Real-time Obtaining marine riser, ensures that marine riser is operated in safe range, is that the difficult problem cracked is needed in deep water petroleum operation badly.According to current marine riser inclination angle Monitoring Status, the requirement of deep-sea oil of combining closely exploitation, for the challenge that deepwater environment brings, the present invention proposes deep water riser corner monitoring method.
As shown in Figure 1, the present invention for initial point, is Z axis with node flexible bottom marine riser straight up, and X-axis and Y-axis were positioned at initial point and perpendicular to the plane of Z axis, X-axis, Y-axis and Z axis are mutually vertical.Pithead position bottom marine riser under water, double-shaft tilt angle sensor is utilized to detect two level inclinations (marine riser respectively with the angle of X-axis and Y-axis) of marine riser, and by angle detection method, two level inclinations are converted to the corner (angle of marine riser and Z-direction) of marine riser, the principle of angle detection method is:
Suppose to utilize two of double-shaft tilt angle sensor to measure axle OA, OB to record and to be respectively α and β (marine riser respectively with the angle of X-axis and Y-axis) with the angle of surface level, the intersection of OAB place plane and OXY place plane is P, the angle of two planes is ∠ MOM', the then inclination angle of plane OAB, namely with angle (corner of marine riser) γ=90-∠ MOM' of OZ axle.
Point A, B are respectively C, D in the projection of surface level, and the projection on straight line P is respectively E, F.Obvious ∠ MOM'=∠ AEC, ∠ MOM'=∠ BFD, then have
sin ( ∠ AEC ) = AC AE - - - ( 1 )
sin ( ∠ BFD ) = BD BF - - - ( 2 )
Again
sin α = AC OA
sin β = BD OB - - - ( 3 )
Because ∠ AOB is right angle, then have:
sin θ = BF OB - - - ( 4 )
cos θ = AE OA
Obtain in conjunction with above-mentioned formula:
By sin 2θ+cos 2θ=1, obtains sin 2(90 ° of-γ)=sin 2α+sin 2β
That is:
As shown from the above formula, as long as double-shaft tilt angle sensor measurement obtains two inclination angles of marine riser and X-axis and Y-axis, the corner of marine riser can just be calculated.
As shown in Figure 2, based on the principle of above-mentioned angle detection method, marine riser inclined angle monitoring system of the present invention, it comprises the data monitor center 3 that roll angle inspection system 1, underwater sound signal receiving trap 2 and is arranged on offshore oil drilling platform, roll angle inspection system 1 is for obtaining the corner data of marine riser and it being sent to underwater sound signal receiving trap 2 by underwater acoustic channel, and the corner data that underwater sound signal receiving trap 2 receives marine riser are carried out processing and sent it to data monitor center 3 and carry out showing and preserving; Wherein, roll angle inspection system 1 comprises controller 11, double-shaft tilt angle sensor 12, DSP13, source encoder 14, channel encoder 15, modulator 16, power amplifier 17, underwater sound transmitting transducer 18 and power supply (not shown); Controller 11 is electrically connected duty and the working time that sensor 12, DSP13, source encoder 14, channel encoder 15, modulator 16, power amplifier 17 and underwater sound transmitting transducer 18 control each device respectively, double-shaft tilt angle sensor 12, DSP13, source encoder 14, channel encoder 15, modulator 16, power amplifier 17 and underwater sound transmitting transducer 18 are sequentially connected in series, and power supply is used for powering respectively for above-mentioned device; Underwater sound receiving trap 2 comprises underwater sound receiving transducer 21, wave filter 22, power amplifier 23, detuner 24 and demoder 25; Underwater sound receiving transducer 21, wave filter 22, power amplifier 23, detuner 24 and demoder 25 are sequentially connected in series; Wherein, underwater sound transmitting transducer 18 and underwater sound receiving transducer 21 carry out communication by underwater acoustic channel.
As shown in Figure 3, based on above-mentioned marine riser inclined angle monitoring system, deep water riser corner monitoring method of the present invention comprises following content:
1, before marine riser 4 enters water, double-shaft tilt angle sensor 12 is installed in the precalculated position of marine riser 4, after marine riser 4 arrives at subsea wellheads 5, controller 11 transmit control double-shaft tilt angle sensor 12 start working, double-shaft tilt angle sensor 12 measures marine riser 4 and angle α and β between X-axis and Y-axis, and inclination angle signal α measurement obtained and β is sent to DSP13, DSP13 calculates the angular signal γ of marine riser 4 according to preset formula (7), and the angular signal γ of marine riser 4 is completed source coding and channel coding successively in source encoder 14 and channel encoder 15, signal entering signal modulator 16 after coding is modulated, and the signal after modulation is sent to power amplifier 17 and carries out power amplification, the electric signal including marine riser corner information is converted to acoustical signal through underwater sound transmitting transducer 18 and launches by the signal after power amplification by power amplifier 17, acoustical signal is propagated through underwater acoustic channel.
2, underwater sound signal receiving trap 2 is hung be located at certain position, below sea (in the embodiment of the present invention by the dipping shot of underwater sound signal receiving trap at b.s.l. about 50m, but be not limited thereto, as long as can signal be received), for receiving marine riser 4 angular signal, be specially: the acoustical signal including marine riser corner information received from underwater acoustic channel is converted to electric signal and is sent to wave filter 22 by underwater sound receiving transducer 21, wave filter 22 is mingled in the interference noise (marine riser fatigue information) in electric signal for filtering, filtered electric signal is sent to detuner 24 and demoder 25 successively after power amplifier 23 amplifies to carry out demodulation code respectively and obtains marine riser corner data, and send it to data monitor center 3.
3, data monitor center 3 shows the marine riser corner data received and preserves, and working platform personnel can according to the marine riser corner information determination job state of data control center 3 display.
The various embodiments described above are only for illustration of the present invention, and wherein each implementation step etc. of method all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.

Claims (2)

1. a deep water riser corner monitoring method, is characterized in that comprising following content:
1) the marine riser inclined angle monitoring system that comprises roll angle inspection system, underwater sound signal receiving trap and data monitor center is set; Roll angle inspection system comprises controller, double-shaft tilt angle sensor, DSP, source encoder, channel encoder, modulator, power amplifier, underwater sound transmitting transducer and power supply; Underwater sound receiving trap comprises underwater sound receiving transducer, wave filter, power amplifier, detuner and demoder;
2) before marine riser enters water, double-shaft tilt angle sensor is installed in the precalculated position of marine riser, after marine riser arrives at subsea wellheads, controller transmit control double-shaft tilt angle sensor start working, double-shaft tilt angle sensor measures marine riser and angle α and β between X-axis and Y-axis, and be sent to DSP by measuring α and β obtained, DSP calculates the angular signal γ of marine riser according to preset formula, and the angular signal γ of marine riser is completed source coding and channel coding successively in source encoder and channel encoder, signal entering signal modulator after coding is modulated, and the signal after modulation is sent to power amplifier and carries out power amplification, the electric signal including marine riser corner information is converted to acoustical signal through underwater sound transmitting transducer and launches by the signal after power amplification by power amplifier, acoustical signal is propagated through underwater acoustic channel, wherein, with node flexible bottom marine riser for initial point, be Z axis straight up, X-axis and Y-axis were positioned at initial point and perpendicular to the plane of Z axis,
3) underwater sound signal receiving trap is hung be located at certain position, below sea, for receiving marine riser angular signal, be specially: the acoustical signal including marine riser corner information received from underwater acoustic channel is converted to electric signal and is sent to wave filter by underwater sound receiving transducer, wave filter is mingled in the interference noise in electric signal for filtering, filtered electric signal is sent to detuner and demoder successively after power amplifier amplifies to carry out demodulation code respectively and obtains marine riser corner data, and sends it to data monitor center;
4) data monitor center shows and preserves the marine riser corner data received, the marine riser corner information determination job state that working platform personnel show according to data control center.
2. a kind of deep water riser corner monitoring method as claimed in claim 1, is characterized in that: described step 2) in DSP calculate the angular signal γ of marine riser according to preset formula, specific formula for calculation is:
CN201510082374.7A 2015-02-15 2015-02-15 Method for monitoring rotating angle of deep marine riser Pending CN104613927A (en)

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Publication number Priority date Publication date Assignee Title
CN105675255A (en) * 2016-02-25 2016-06-15 中国海洋石油总公司 Pool simulation experiment system for platform marine riser coupling
CN106677721A (en) * 2017-01-19 2017-05-17 燕山大学 Automatic anti-typhoon perpendicularity adjusting device for deepwater drilling riser
CN106767649A (en) * 2016-11-21 2017-05-31 中国科学院光电技术研究所 It is a kind of suitable for rotary shaft parallel to horizontal plane object rotation angle measurement method
CN107013208A (en) * 2016-01-27 2017-08-04 江西云晖生物芯片技术有限公司 A kind of NEXT series of products MSP430 telecommunication systems
CN111536975A (en) * 2020-05-15 2020-08-14 中海石油(中国)有限公司 Cold seawater pipe attitude measurement system and method for floating ocean temperature difference energy power generation system

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107013208A (en) * 2016-01-27 2017-08-04 江西云晖生物芯片技术有限公司 A kind of NEXT series of products MSP430 telecommunication systems
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CN106767649A (en) * 2016-11-21 2017-05-31 中国科学院光电技术研究所 It is a kind of suitable for rotary shaft parallel to horizontal plane object rotation angle measurement method
CN106767649B (en) * 2016-11-21 2019-11-29 中国科学院光电技术研究所 A kind of object rotation angle measurement method being parallel to horizontal plane suitable for rotary shaft
CN106677721A (en) * 2017-01-19 2017-05-17 燕山大学 Automatic anti-typhoon perpendicularity adjusting device for deepwater drilling riser
CN111536975A (en) * 2020-05-15 2020-08-14 中海石油(中国)有限公司 Cold seawater pipe attitude measurement system and method for floating ocean temperature difference energy power generation system

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