CN108071384A - Marine riser gas cut monitors system and method - Google Patents
Marine riser gas cut monitors system and method Download PDFInfo
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- CN108071384A CN108071384A CN201711286291.5A CN201711286291A CN108071384A CN 108071384 A CN108071384 A CN 108071384A CN 201711286291 A CN201711286291 A CN 201711286291A CN 108071384 A CN108071384 A CN 108071384A
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- marine riser
- gas cut
- ultrasonic
- fluid
- monitoring device
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/107—Locating fluid leaks, intrusions or movements using acoustic means
Abstract
The present invention provides a kind of marine riser gas cuts to monitor system and method, and the system specifically includes processing unit and underwater monitoring device；The underwater monitoring device includes at least two groups of gas cut data detection modules, the gas cut data detection module is arranged at different height on underwater marine riser, for the fluid emission ultrasonic pulse into the marine riser respectively, the ultrasonic signal of acquisition marine riser inner section fluid；The processing unit is connected with the underwater monitoring device, for control the underwater monitoring device into the marine riser fluid emission ultrasonic pulse and according to the ultrasonic signal obtain gas cut situation.
Description
Technical field
The present invention relates to DRILLING APPLICATION technical field, espespecially a kind of marine riser gas cut monitoring system and method.
Background technology
Gas cut can occur if being bored in drilling process and meeting high-pressure gas reservoir, be difficult to pass through mud pit level in the starting stage of gas cut
The methods of detection, difference in flow overflow detection or monitoring of equipment arrive, and with the increase of well depth, find that the difficulty of gas cut increases ahead of time
Greatly, the reaction time for leaving well control for significantly reduces so that the early detection of gas cut becomes the key points and difficulties of deep-well well control.It is and right
In deepwater drilling, first, reduce with the increase well kick surplus of the depth of water, it is easier to gas cut occur；Secondly, in deep water high static pressure ring
Under border, the general size of bubble is smaller, and gas is caused to be difficult to detect gas cut in time by conventional method when entering marine riser.Cause
This, it is the most important thing of well control work that gas cut how is promptly and accurately found in deepwater drilling.
Current marine riser gas cut monitoring device, which uses, is mounted on water proof bottom of the tube, the underwater module of mud line position, carry out every
Flow velocity or gas-bearing property monitoring, judge whether gas cut occur in marine riser accordingly inside water pipe.Existing technology faces two masters
Want problem：1. using oil base drilling fluid, when the depth of water is more than 1000 meters, pressure is very high in the pit shaft of seabed mud line position,
The natural gas of pit shaft is invaded it is possible that being fully dissolved in diesel fuel composition contained in drilling fluid, carries the drilling fluid of natural gas
Free gas presence is had no when passing through measurement point, therefore gas cut can not be identified by supersonic Doppler monitoring device, monitoring device
Failure；2. existing Doppler's gas cut monitoring method is point measuring method, the void fraction letter on measurement section can not be grasped comprehensively
Breath, it is easy to cause wrong report phenomenon.Two above problem causes above being subject to sternly in the monitoring application of marine riser gas cut for Doppler method
Recasting is about.
The content of the invention
Present invention aims at a kind of timely and accurately monitoring marine riser gas cut state monitoring system is provided, to meet
The demand of early stage gas cut monitoring can be carried out to marine riser inside under different operating ambient condition.
In order to achieve the above object, the present invention provides a kind of marine riser gas cuts to monitor system, the system is specifically comprising processing
Device and underwater monitoring device；The underwater monitoring device includes at least two groups of gas cut data detection modules, the gas cut data
Detection module is arranged at different height on underwater marine riser, for the fluid emission ultrasonic pulse into the marine riser respectively,
Obtain the ultrasonic signal of marine riser inner section fluid；The processing unit is connected with the underwater monitoring device, for controlling
The underwater monitoring device into the marine riser fluid emission ultrasonic pulse and according to the ultrasonic signal obtain gas
Invade situation.
In above-mentioned marine riser gas cut monitoring system, it is preferred that the gas cut data detection module include fixed cell and
Acoustoelectronic sensor, the fixed cell are used to the acoustoelectronic sensor being fixed on the water proof pipe outer wall；Institute
Acoustoelectronic sensor is stated for the fluid emission ultrasonic pulse into the marine riser, and receives and is cut through in the marine riser
The ultrasonic signal of surface current body.
In above-mentioned marine riser gas cut monitoring system, it is preferred that the gas cut data detection module also includes hollow fan ring
Body and head cover, it is described it is hollow fan ring body the water proof pipe outer wall is fixed on by the fixed cell, by sealing ring with it is described
Head cover is connected；The acoustoelectronic sensor is arranged in the inner cavity of the hollow fan ring body.
In above-mentioned marine riser gas cut monitoring system, it is preferred that it is described it is hollow fan ring body be with the marine riser abutted surface
Curved surface, the radius of the curved surface is consistent with the water proof pipe outside diameter, and the curved surface is provided with silicon with the marine riser abutted surface
Glue seal groove, the silica gel sealing slot are used to reserve gap between the curved surface and the marine riser outside wall surface.
In above-mentioned marine riser gas cut monitoring system, it is preferred that the acoustoelectronic sensor is sent out comprising multiple ultrasonic waves
Emitter and multiple ultrasonic receivers, the ultrasonic transmitter and the ultrasonic receiver are circumferentially-spaced along the marine riser
Distribution；The ultrasonic transmitter and the ultrasonic receiver and the hollow fan ring body abutted surface are planar structure, and are wrapped
It is covered with and leads sound layer, the sound layer of leading is for conduct ultrasound.
In above-mentioned marine riser gas cut monitoring system, it is preferred that every group of at least two groups gas cut data detection modules
Fluid emission ultrasonic pulse, the acquisition into the marine riser by least two preset frequencies respectively of gas cut data detection module
The ultrasonic signal of fluid in marine riser different height.
In above-mentioned marine riser gas cut monitoring system, it is preferred that the system is also comprising communication cable, the communication cable
One end is connected with the processing unit, the other end by moon pool along marine riser extend to the underwater monitoring device and with its phase
Even；It is connected between the gas cut data detection module of the underwater monitoring device by the communication cable；The communication cable with
The connector of the underwater monitoring device is connected by watertight connector, and the watertight connector is isolated for providing external and internal pressure, institute
It states and high pressure contact pin is provided in watertight connector, described high pressure contact pin one end is connected with the communication cable, the other end and the water
Lower monitoring device is connected.
In above-mentioned marine riser gas cut monitoring system, it is preferred that the processing unit includes the processing unit and includes number
According to control acquisition module and signal analysis shows that module；The data control collection module is connected with the underwater monitoring device,
For sending pulse control signal to the underwater monitoring device, control the underwater monitoring device synchronous into the marine riser
Fluid emission ultrasonic pulse and the reception ultrasonic signal；The signal is analysis shows that module is controlled with the data
Acquisition module is connected, and for obtaining gas cut situation according to the ultrasonic signal, initializes and change the data control collection
Module parameter and storage and show the gas cut situation.
The present invention also provides a kind of marine riser gas cut monitoring method, the method includes：It is installed on the described of different height
Gas cut data detection module emits ultrasonic pulse simultaneously, and receives the ultrasonic signal of the water proof tube fluid；According to institute
State the instantaneous void fraction distribution that ultrasonic signal obtains the section fluid of different height in marine riser；According in the marine riser not
The void fraction distribution of level section fluid, which calculates, obtains gas cut situation.
In above-mentioned marine riser gas cut monitoring method, it is preferred that the gas cut data inspection for being installed on different height
It surveys module and emits ultrasonic pulse simultaneously, and the ultrasonic signal for receiving the water proof tube fluid includes：Gas cut described in every group
Multiple ultrasonic transmitters individually emit the ultrasonic pulse of predetermined quantity successively in data detection module, and multiple ultrasonic waves receive
Device receives the ultrasonic signal simultaneously.
In above-mentioned marine riser gas cut monitoring method, it is preferred that obtained according to the ultrasonic signal different in marine riser
The instantaneous void fraction distribution of the section fluid of height includes：Ultrasonic signal strength, frequency are obtained according to the ultrasonic signal
With arrival time delay characteristic quantity；According to the ultrasonic signal strength, frequency and time delay characteristic quantity is reached, described in reconstruct
The instantaneous void fraction distribution of the section fluid of different height in marine riser.
In above-mentioned marine riser gas cut monitoring method, it is preferred that according to the section fluid of different height in the marine riser
Void fraction distribution calculate obtain gas cut situation include：According to the instantaneous gassiness of the section fluid of different height in the marine riser
Rate distribution obtains migration velocity and evolutionary process of the water proof tube fluid along flow direction, is obtained according to the migration velocity and evolutionary process
Obtain the gas cut situation.
The advantageous effects of the present invention are：Marine riser gas cut state is monitored using the mode that ultrasonic tomogram scans,
Realize round-the-clock real-time monitoring；Gas phase in multiphase flow and solid phase signal are separated using multi-frequency ultrasonic technology, increased
The accuracy of gas cut monitoring；Can meet can carry out early stage gas cut monitoring under different operating ambient condition to marine riser inside
Demand.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, not
Form limitation of the invention.In the accompanying drawings：
Fig. 1 is the structure diagram that marine riser gas cut provided by the present invention monitors system；
Fig. 2A is the structure diagram of gas cut data detection module provided by the present invention；
Fig. 2 B acoustic sensor layout drawings；
Fig. 2 C are the structure diagram of watertight connector provided by the present invention；
Fig. 3 is ultrasonic propagation route schematic diagram provided by the present invention；
Fig. 4 is marine riser gas cut monitoring method flow diagram.
Drawing reference numeral
1- processing units；11- signals are analysis shows that module；12- data control collection modules；2- underwater monitoring devices；21-
Gas cut data detection module；1 ultrasound transmit sensor of 211- frequencies；1 ultrasonic receiver sensor of 212- frequencies；213- frequencies
2 ultrasound transmit sensors；2 ultrasonic receiver sensor of 214- frequencies；3 subsurface communication cables.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are more clearly understood, with reference to embodiment and attached
Figure, is described in further details the present invention.Here, the schematic description and description of the present invention is used to explain the present invention,
It is but not as a limitation of the invention.
Shown in please referring to Fig.1, marine riser gas cut provided by the present invention monitors system, specifically includes processing unit 1 and water
Lower monitoring device 2；The underwater monitoring device includes at least two groups of gas cut data detection modules 21, the gas cut Data Detection mould
Block is arranged at different height on underwater marine riser, for the fluid emission ultrasonic pulse into the marine riser respectively, obtain every
The ultrasonic signal of water tube fluid；The processing unit 1 is connected with the underwater monitoring device 2, described underwater for controlling
Monitoring device 2 into the marine riser fluid emission ultrasonic pulse and acquisition, analyze and store the underwater monitoring device
The ultrasonic signal and preprocessed data obtained, and become more meticulous to the data after the pretreatment of underwater monitoring device 2
Processing and correlation computations obtain gas cut situation and gas cut development according to result of calculation.Wherein, first group of gas cut Data Detection
Module is located at the marine riser pipeline section nearest apart from subsea blowout preventer, second group of gas cut data detection module position in two kinds of situation into
Row selection, when it is that can dissolve the drilling fluid of natural gas to be used in drillng operation, position is arranged under working condition most
Bubble point position under small solution gas ratio, when using the drilling fluid of insoluble natural gas in drillng operation, position is positioned above
Between first group of gas cut data detection module and sea.It is configured in monitoring device more than two gas cut data detection modules
In the case of, remaining gas cut data detection module position is arranged between second group of gas cut data detection module and sea.In this reality
It applies in example, gas cut situation mainly shows situation difference by gas in fluid under the conditions of different pressures, and causes to utilize ultrasound
Ripple obtain signal condition it is also different, specifically please refer to Fig.3 shown in, when pressure change, being dissolved in gas in fluid will be with stream
Body separates, and the route of transmission of ultrasonic wave will change this moment；Thereafter obtained using the underwater monitoring device of different height different
Ultrasonic signal, then compare to each other, so as to confirm whether water proof tube fluid occurs gas cut；When mud face position, pressure is more than
In the case of gas evolution minimum pressure, if dissolved natural gas is carried in oil base drilling fluid, ultrasonic energy will change,
Different ultrasonic signals are obtained using underwater monitoring device accordingly, confirm gas bearing condition in the drilling fluid of mud face position；The implementation
In example, the underwater monitoring device, also can root in certain real work mainly comprising at least two groups of gas cut data detection modules 21
According to water proof length of tube, situations such as depth of water, adds in an appropriate number of gas cut data detection module 21, the marine riser gas cut monitoring system
System can also include warning device, and the warning device can be connected with the processing unit, be conformed to a predetermined condition with working as gas cut situation
When, alarm signal is sent, prompts staff's timely processing；Certainly specific type of alarm and predetermined condition, the present invention is herein simultaneously
It is not limited.
In the above-described embodiments, the processing unit can include data control collection module 12 and signal analysis shows that module
11；The data control collection module 12 is connected with the underwater monitoring device 2, for being sent to the underwater monitoring device 2
Pulse control signal controls synchronous fluid emission ultrasonic pulse, the Yi Jijie into the marine riser of the underwater monitoring device 2
Receive the ultrasonic signal；The signal is analysis shows that module 11 is connected with the data control collection module 12, for handling
Ultrasonic signal, 12 parameter of initialization and modification data control collection module, to the signal analysis shows that after the processing of module 11
Signal storage, analysis and the results show.
In real work, each component connection relation in the marine riser gas cut monitoring system provided according to the present invention, with reference to
On-site actual situations, marine riser gas cut described in unitary construction that can be as shown in Figure 1 monitor system, marine riser gas cut monitoring system master
To include two components：Ground host machine that is, processing unit 1 on platform and underwater on marine riser
Monitoring device 2；Wherein, the processing unit 1 includes data control collection module 12 and signal analysis shows that module 11；The number
It is connected according to control acquisition module 12 with the underwater monitoring device 2, for sending Pulse Width Control letter to the underwater monitoring device 2
Number, it controls the synchronous fluid emission ultrasonic pulse into the marine riser of the underwater monitoring device 2 and receives the ultrasound
Ripple signal；The signal is analysis shows that module 11 is connected with the data control collection module 12, for according to the ultrasonic wave
Signal obtains gas cut situation, initializes and changes the data control collection module parameter and storage and show the gas cut
Situation.
In the above-described embodiments, the gas cut data detection module 21 includes fixed cell and acoustoelectronic sensor, institute
Fixed cell is stated for the acoustoelectronic sensor to be fixed on the water proof pipe outer wall；The acoustoelectronic sensor is used
In the fluid emission ultrasonic pulse into the marine riser, and the ultrasonic wave received through the marine riser inner section fluid is believed
Number.In real work for improve data accuracy, the acoustoelectronic sensor also can include multiple ultrasonic transmitters and
Multiple ultrasonic receivers, the ultrasonic transmitter and the ultrasonic receiver are circumferentially-spaced and upper and lower along the marine riser
Two layers of distribution, and the ultrasonic transmitter is identical with the ultrasonic receiver quantity；The ultrasonic transmitter and described
Ultrasonic receiver is planar structure with the fan ring body abutted surface, and is coated with and leads sound layer, is used as and leads for example with lithium saponify
Sound material, the sound layer of leading is for conduct ultrasound.The ultrasonic sensor point in the gas cut data detection module 21
Upper and lower two layers, every layer has the multipair ultrasound transmit sensor and ultrasonic receiver sensor being spaced apart, two layers of frequency used
Rate is different.
In an embodiment of the present invention, every group of at least two groups gas cut data detection modules 21 passes through at least two respectively
Kind preset frequency fluid emission ultrasonic pulse into the marine riser obtains the ultrasonic wave letter of fluid in marine riser different height
Number；In real work, first group of gas cut data detection module 21 can be located at the marine riser pipeline section nearest apart from subsea blowout preventer, the
Two groups of 21 positions of gas cut data detection module can make choice in two kinds of situation, be that can dissolve naturally when being used in drillng operation
During the drilling fluid of gas, position is arranged under working condition bubble point position under minimum solution gas ratio, when being adopted in drillng operation
During with the drilling fluid of insoluble natural gas, position is positioned above between first group of gas cut data detection module 21 and sea.When
During more than two groups of gas cut data detection modules 21, remaining 21 position of gas cut data detection module is arranged at second group of gas incursion check mould
Between block 21 and sea；The preset frequency include 20KHz between 5MHz or 20KHz between 500KHz or 500KHz extremely
Between 5MHz, in real work, staff can arbitrarily be selected according to above-mentioned section any value at least two sections as
To be used preset frequency；Certainly in view of what the difference of environment, be specifically worth using, the present invention does not just do excessive limitation herein.
It please refers to Fig.2 shown in A, in an embodiment of the present invention, the gas cut data detection module 21 also includes hollow fan
Ring body and head cover, the hollow fan ring body are fixed on the water proof pipe outer wall by the fixed cell, pass through sealing ring and institute
Head cover is stated to be connected；The acoustoelectronic sensor is arranged in the inner cavity of the hollow fan ring body.Wherein, the hollow fan ring body
With the marine riser abutted surface be curved surface, the radius of the curved surface is consistent with the water proof pipe outside diameter, and the curved surface with it is described
Marine riser abutted surface is provided with silica gel sealing slot, the silica gel sealing slot be used for the curved surface and the marine riser outside wall surface it
Between be equipped with interspace in advance, further, the present invention in can also include multiple hollow fan ring bodies, those it is hollow fan ring bodies it is circumferentially equal
Be distributed on the same section of water proof pipe outer wall, the head cover has a cable connection port, external cable by the cable connection port with it is described
Acoustoelectronic sensor is connected.
Illustrate above-described embodiment to be clearer, then please refer to Fig.2 shown in B, in real work, sensed in acoustoelectronic
Device mainly comprising ultrasonic wave transmitting probe and receiving transducer, by fixed cell by probe be tightly fastened in the cavity close to every
On the bottom surface of water pipe one side；The mounting surface of transmitting probe and receiving transducer is processed into plane, fixes before probe in probe table
Face applies one layer and leads sound material, reduces the attenuation of ultrasonic wave；It is processed into curved surface, subsequent corrosion in the face that cavity bottom surface is contacted with marine riser
It is identical with water proof pipe outside diameter, while circle silica gel injection slot is opened for leading sound material between seal cavity and marine riser at edge
Material；In addition to the front end ultrasonic sensor of detection marine riser air entrapment content and drilling fluid flow regime parameter, signal
Preprocessor is also encapsulated in underwater module, the effect of the component be extraction receive ultrasonic intensity in signal, frequency and
Arrival time informational content is simultaneously earthward sent.
Shown in please referring to Fig.1, the marine riser gas cut monitoring system is also comprising communication cable 3, described 3 one end of communication cable
Be connected with the processing unit 1, the other end by moon pool along marine riser extend to the underwater monitoring device 2 and with its phase
Even；It is connected between the gas cut data detection module 21 of the underwater monitoring device 2 also by the communication cable 3.Wherein, it is described
Communication cable 3 is connected with the connector of the underwater monitoring device 2 by watertight connector, and the watertight connector is inside and outside for providing
Pressure isolation is provided with high pressure contact pin in the watertight connector, and described high pressure contact pin one end is connected with the communication cable 3, separately
One end is connected with the underwater monitoring device 2.In real work, the front end comprising pressure-resistant encapsulation senses in underwater monitoring device 2
Device is mainly responsible for the transmitting and reception of ultrasonic wave, while earthward equipment is sent by signal.On underwater monitoring device 2 and platform
Host between by corrosion-resistant and tension armored cable connect, cable via moon pool along marine riser extend to underwater monitoring dress
2 are put, power to underwater monitoring device 2 and realizes signal transmission.Wherein, underwater monitoring device 2 contains acoustoelectronic inside it
Sensor, therefore in actual use, it is necessary to consider the problems of that underwater sealing harmony conducts two aspects.A institutes are please referred to Fig.2 again
Show, gas cut data detection module 21 is made of several hollow fan ring cavity bodies including sensor and head cover, between head cover and cavity
Sealing ring mounting groove has been reserved in processing, which can meet the seal request under 30MPa pressure differentials.Submerged cable with
The connection of the internal electronic device of gas cut data detection module 21 is attached using watertight connector mode, and watertight connector mainly carries
For inside and outside pressure isolation, inside modules are low pressure zone, and outside is the high-pressure zone of environments such as subsea, and watertight connector can ensure
Armored cable line is introduced into the pressure-resistant and sealing inside modules position.Watertight connector is equally fixed using sealing ring sealing means
On fan ring cavity body.The high pressure contact pin being equipped with inside watertight connector for the connection of interior external circuit (refers to the watertight connector in Fig. 2 C
Structure chart), the structure design of high pressure contact pin is to meet the pressure isolation between high-low pressure, and every high pressure contact pin has two layers
Sealing ring seals, and bottom end is connected on the electric appliance of inside cavity low pressure zone, the electricity in upper one end connection external high pressure power area
Cable.High pressure contact pin is turned on seawater in order to prevent, and cable is designed with high pressure contact pin connecting portion there are one chamber, by injecting Gao Zhen
Empty silicone grease realizes isolation seawater, and the cabling requirements that design method disclosure satisfy that more than 30MPa are connected with this.
To sum up, in marine riser gas cut monitoring system provided by the present invention a whole set of hardware system as an organic whole,
Because of underwater various components, after marine riser tripping in place, underwater component can not be adjusted within a drilling period, because
This is in actual use except the factors such as the reliability of consideration electric appliance, stability, seawater corrosion resistance and the shock resistance of structure are also
Emphasis, in order to which underwater module is made closely to be stably mounted at water proof pipe outer wall, design machined the pre- chucking mechanism of marine riser, specifically
It please refers to Fig.2 shown in A, which includes 4 cyclic structures being mounted on marine riser, is loaded in advance including clamping screw
With module positioning and locking bolt；When in use, chucking mechanism is mounted on marine riser first, then underwater module is passed through into fixation
Unit is fixed thereon, in use, needing to ensure that contact surface fitting is uniform between underwater module and marine riser, while also to be ensured
Underwater equipment is stable and firm during marine riser tripping in and test.In addition, underwater armored cable is fixed using with marine riser
Tripping in, it is equally spaced to be fixed with marine riser side auxiliary line by the fixed mode of bandage.
The present invention also provides a kind of marine riser gas cut monitoring method, the method includes：It is installed on the described of different height
Gas cut data detection module 21 emits ultrasonic pulse simultaneously, and receives the ultrasonic signal of the water proof tube fluid；According to
The ultrasonic signal obtains the instantaneous void fraction distribution of the section fluid of different height in marine riser；According in the marine riser
The void fraction distribution of the section fluid of different height, which calculates, obtains gas cut situation.Wherein, according to the ultrasonic signal obtain every
The instantaneous void fraction of the section fluid of different height is distributed in this link in water pipe, and existing ultrasonic tomogram specifically can be used
Certainly, in real work, other modeling means can also be used, the present invention is not limited herein in the method for scanning.
In real work, emit simultaneously in the gas cut data detection module 21 of the above-mentioned steps loaded on different height super
Sound wave pulse, and receive in the ultrasonic signal of the water proof tube fluid, using gas cut data detection module described in every group
Multiple ultrasonic transmitters individually emit the ultrasonic pulse of predetermined quantity successively in 21, and multiple ultrasonic receivers receive simultaneously
The ultrasonic signal；That is, individually transmitting has each ultrasonic transmitter successively in gas cut data detection module 21 described in every group
The pulse ultrasonic wave of number is limited, multiple receivers receive simultaneously；Being convenient for this being capable of root during ultrasonic signal described in post-collection
It is stabbed according to its settling time launch time, so as to analyze flow velocity and evolutionary process.It is obtained in above-mentioned steps according to the ultrasonic signal
Obtain in the instantaneous void fraction distribution of the section fluid of different height in marine riser then can obtain ultrasound according to the ultrasonic signal
Ripple signal strength, frequency and arrival time delay characteristic quantity；According to the ultrasonic signal strength, frequency and reach time delay
Characteristic quantity reconstructs the instantaneous void fraction distribution of the section fluid of different height in the marine riser.Wherein instantaneous void fraction distribution
Will by timestamp label, the timestamp time for the first ultrasonic transmitter transmitting of this round at the time of or this round last
At the time of a ultrasonic transmitter transmitting；Thereafter, further according to the void fraction point of the section fluid of different height in the marine riser
Cloth is calculated to obtain in gas cut situation and then obtained using the instantaneous void fraction distribution of the section fluid of different height in the marine riser
Migration velocity and evolutionary process of the water proof tube fluid along flow direction, that is, to each gas cut Data Detection of labeled timestamp
The instantaneous void fraction distribution results that module 21 obtains carry out correlation computations analysis, obtain gas cut gas in fortune of the marine riser along flow direction
Move speed and evolutionary process；The gas cut situation is obtained according to the migration velocity and evolutionary process；The gas cut situation is
Drilling fluid with gas forward position, along marine riser void fraction distribution and reservoir rate of gas cut.
With this, marine riser gas cut state is monitored using the mode that ultrasonic tomogram scans, realizes round-the-clock real-time monitoring；It adopts
Gas phase in multiphase flow and solid phase signal are separated with multi-frequency ultrasonic technology, increase the accuracy of gas cut monitoring；It can expire
Foot can carry out marine riser inside under different operating ambient condition the demand of early stage gas cut monitoring.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Particular embodiments described above has carried out the purpose of the present invention, technical solution and advantageous effect further in detail
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Scope is protected, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection domain of invention.
Claims (12)
1. a kind of marine riser gas cut monitors system, which is characterized in that the system includes processing unit and underwater monitoring device；
The underwater monitoring device includes at least two groups of gas cut data detection modules, and the gas cut data detection module is arranged at water
Different height on lower marine riser for the fluid emission ultrasonic pulse into the marine riser respectively, obtains marine riser inner section
The ultrasonic signal of fluid；
The processing unit is connected with the underwater monitoring device, for controlling the underwater monitoring device into the marine riser
Fluid emission ultrasonic pulse and according to the ultrasonic signal obtain gas cut situation.
2. marine riser gas cut according to claim 1 monitors system, which is characterized in that the gas cut data detection module bag
Containing fixed cell and acoustoelectronic sensor, the fixed cell is used to the acoustoelectronic sensor being fixed on the water proof
In pipe outer wall；The acoustoelectronic sensor is used for the fluid emission ultrasonic pulse into the marine riser, and receives through institute
State the ultrasonic signal of marine riser inner section fluid.
3. marine riser gas cut according to claim 2 monitors system, which is characterized in that the gas cut data detection module is also
Comprising hollow fan ring body and head cover, the hollow fan ring body is fixed on the water proof pipe outer wall by the fixed cell, passes through
Sealing ring is connected with the head cover；The acoustoelectronic sensor is arranged in the inner cavity of the hollow fan ring body.
4. marine riser gas cut according to claim 3 monitors system, which is characterized in that the hollow fan ring body with it is described every
Water pipe abutted surface is curved surface, and the radius of the curved surface is consistent with the water proof pipe outside diameter, and the curved surface and the marine riser phase
Junction is provided with silica gel sealing slot, and the silica gel sealing slot is used to be equipped with sky between the curved surface and the marine riser outside wall surface
Gap.
5. marine riser gas cut according to claim 3 monitors system, which is characterized in that the acoustoelectronic sensor includes
Multiple ultrasonic transmitters and multiple ultrasonic receivers, the ultrasonic transmitter and the ultrasonic receiver along it is described every
The circumferentially-spaced distribution of water pipe；The ultrasonic transmitter and the ultrasonic receiver and the hollow fan ring body abutted surface are flat
Face structure, and be coated with and lead sound layer, the sound layer of leading is for conduct ultrasound.
6. marine riser gas cut according to claim 1 monitors system, which is characterized in that at least two groups of gas cut data inspections
By at least two preset frequencies, into the marine riser, fluid emission surpasses every group of gas cut data detection module of survey module respectively
Sound wave pulse obtains the ultrasonic signal of fluid in marine riser different height.
7. marine riser gas cut according to claim 1 monitors system, which is characterized in that the system is also comprising communication electricity
Cable, described communication cable one end are connected with the processing unit, and the other end is extended to described underwater by moon pool along marine riser
Monitoring device is simultaneously coupled；Pass through the communication cable phase between the gas cut data detection module of the underwater monitoring device
Even；The communication cable is connected with the connector of the underwater monitoring device by watertight connector, and the watertight connector is used to carry
Isolate for external and internal pressure, high pressure contact pin is provided in the watertight connector, described high pressure contact pin one end connects with the communication cable
It connects, the other end is connected with the underwater monitoring device.
8. marine riser gas cut according to claim 1 monitors system, which is characterized in that the processing unit includes data control
Acquisition module and signal processed are analysis shows that module；
The data control collection module is connected with the underwater monitoring device, for sending pulse to the underwater monitoring device
Control signal controls the synchronous fluid emission ultrasonic pulse into the marine riser of the underwater monitoring device and receives institute
State ultrasonic signal；
The signal is analysis shows that module is connected with the data control collection module, for being obtained according to the ultrasonic signal
Gas cut situation initializes and changes the data control collection module parameter；And store and show the gas cut situation.
9. a kind of marine riser gas cut monitoring method suitable for marine riser gas cut described in claim 1 monitoring system, feature
It is, the method includes：
The gas cut data detection module for being installed on different height emits ultrasonic pulse simultaneously, and receives in the marine riser
The ultrasonic signal of fluid；
The instantaneous void fraction that the section fluid of different height in marine riser is obtained according to the ultrasonic signal is distributed；
It is calculated according to the void fraction distribution of the section fluid of different height in the marine riser and obtains gas cut situation.
10. marine riser gas cut monitoring method according to claim 9, which is characterized in that the different height that is installed on
The gas cut data detection module emits ultrasonic pulse simultaneously, and receives the ultrasonic signal bag of the water proof tube fluid
Contain：Multiple ultrasonic transmitters individually emit the ultrasonic wave arteries and veins of predetermined quantity successively in gas cut data detection module described in every group
Punching, multiple ultrasonic receivers receive the ultrasonic signal simultaneously.
11. marine riser gas cut monitoring method according to claim 9, which is characterized in that obtained according to the ultrasonic signal
The instantaneous void fraction distribution for obtaining the section fluid of different height in marine riser includes：Ultrasonic wave is obtained according to the ultrasonic signal
Signal strength, frequency and arrival time delay characteristic quantity；According to the ultrasonic signal strength, frequency and reach time delay spy
Sign amount reconstructs the instantaneous void fraction distribution of the section fluid of different height in the marine riser.
12. marine riser gas cut monitoring method according to claim 9, which is characterized in that according to different in the marine riser
The void fraction distribution of the section fluid of height calculates acquisition gas cut situation and includes：According to the section of different height in the marine riser
The instantaneous void fraction distribution of fluid obtains migration velocity and evolutionary process of the water proof tube fluid along flow direction, according to the migration speed
Degree and evolutionary process obtain the gas cut situation.
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