CN105114052A - Multiphase flow flowmeter in well and monitor method - Google Patents
Multiphase flow flowmeter in well and monitor method Download PDFInfo
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- CN105114052A CN105114052A CN201510205383.0A CN201510205383A CN105114052A CN 105114052 A CN105114052 A CN 105114052A CN 201510205383 A CN201510205383 A CN 201510205383A CN 105114052 A CN105114052 A CN 105114052A
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Abstract
The invention discloses a multiphase flow flowmeter in the well and a monitor method. The multiphase flow flowmeter in the well comprises an acquisition device in the well and a processing device on the ground. The acquisition device in the well comprises an optical fiber sound wave sensor, an optical fiber pressure sensor and an optical fiber temperature sensor. The optical fiber sound wave sensor, the optical fiber pressure sensor and the optical fiber temperature sensor are arranged on pipe wall at one side of a pipe in the well. A sound wave signal of the optical fiber sound wave sensor is transmitted to the processing device on the ground. A temperature signal of the optical fiber pressure sensor is transmitted to the processing device on the ground. A pressure signal of the optical fiber temperature sensor is transmitted to the processing device on the ground. The multiphase flow flowmeter in the well provided by the technical scheme of the invention is simple in structure design, convenient to operate, and suitable for on-site operation in an oil gas well. The multiphase flow flowmeter in the well can save work time, raise work efficiency, and and reduce the work time in the well, and manpower and material resources.
Description
Technical field
The present invention relates to underground monitoring field, especially relate to a kind of down-hole multiphase flow rate and take into account monitoring method.
Background technology
Generally, Oil/gas Well is only concentrated at ground well head or oil recovery factory when producing and is measured, and generally only monitors flow, and the monitoring of phase holdup is also generally discontinuity, can only carry out ground unified record to liquid generated underground aerogenesis.For multiphase flow rates, the phase holdup of down-hole reality, the characteristic such as temperature, pressure cannot accomplish on-line monitoring, refers more particularly to down-hole commingling production, cannot monitor especially.
The down-hole multiphase flow flowmeter that current down-hole also has a small amount of electronic type, multiple instruments combined, but generally can not be placed on underground monitoring for a long time; In addition, point measurement can only be carried out, can not distributed measurement.If need to measure full well, also need frequently to remove instrument, cause a lot of inconvenience in engineering, extend the activity duration, down-hole is intervened large.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of down-hole multiphase flow rate to take into account monitoring method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of down-hole multiphase flow flowmeter, comprises down-hole collecting device and aboveground treatment facility;
Described down-hole collecting device comprises fiber optic acoustic sensors, fibre optic compression sensor and fibre optic temperature sensor;
Described fiber optic acoustic sensors, described fibre optic compression sensor and described fibre optic temperature sensor are all arranged on the tube wall of down-hole string side;
The acoustic signals of described fiber optic acoustic sensors transfers to described aboveground treatment facility; The temperature signal of described fibre optic temperature sensor transfers to described aboveground treatment facility; The pressure signal of described fibre optic compression sensor transfers to described aboveground treatment facility.
In the multiphase flow flowmeter of down-hole of the present invention, described down-hole collecting device comprises fibre optic temperature sensor described in fiber optic acoustic sensors described at least one group and at least one group;
Often organize described fiber optic acoustic sensors and often organize the distributed bearing of trend along described down-hole string of described fibre optic temperature sensor and arrange.
In the multiphase flow flowmeter of down-hole of the present invention, described down-hole collecting device comprises fibre optic compression sensor described at least one group;
The each pressure measurement point one_to_one corresponding often organized on described fibre optic compression sensor and described down-hole string is arranged.
In the multiphase flow flowmeter of down-hole of the present invention, described fiber optic acoustic sensors, described fibre optic compression sensor and described fibre optic temperature sensor are integrated in underground optical cable, and described underground optical cable is arranged on the tube wall of described down-hole string side.
In the multiphase flow flowmeter of down-hole of the present invention, described underground optical cable is fixed on described down-hole string by multiple optical cable protector, and multiple described optical cable protector distributes along the bearing of trend of described underground optical cable.
In the multiphase flow flowmeter of down-hole of the present invention, described aboveground treatment facility comprises
Optical-electrical converter, is connected with described down-hole collecting device, for receiving the data of described down-hole collecting device, and is converted into the signal of telecommunication;
A/D converter, is connected with described optical-electrical converter, for converting the described signal of telecommunication to data signal and exporting;
DSP digital processing unit, is connected with described A/D converter, for receiving described data signal and processing.
In the multiphase flow flowmeter of down-hole of the present invention, described aboveground treatment facility also comprises the fpga chip be connected with described DSP digital processing unit.
In the multiphase flow flowmeter of down-hole of the present invention, described aboveground treatment facility also comprises clock module;
Described clock module is connected with described down-hole collecting device, and the control end of described clock module is connected with described DSP digital processing unit, with by clock module record described in described DSP digital processor controls or read acquisition time.
In the multiphase flow flowmeter of down-hole of the present invention, described aboveground treatment facility also comprises
Reshaper, is connected with described optical-electrical converter, for the described signal of telecommunication is shaped as pulse signal;
Counter, input is connected with described reshaper, and output is connected with described DSP digital processing unit, for counting described pulse signal and transferring to described DSP digital processing unit.
Present invention also offers a kind of underground monitoring method, comprise the steps:
S1, down-hole collecting device is integrated into underground optical cable, and by described underground optical cable down in Oil/gas Well;
S2, utilize the fiber optic acoustic sensors in the collecting device of described down-hole, fibre optic compression sensor, fibre optic temperature sensor to gather downhole data, and the described downhole data collected is transferred in aboveground treatment facility by ground optical cable;
S3, described aboveground treatment facility, according to the described downhole data got and built-in computation model, draw down-hole actual characteristic value;
S4, by display module, described down-hole actual characteristic value to be shown, to realize monitoring.
Implement technical scheme of the present invention, at least there is following beneficial effect: the down-hole collecting device of this down-hole multiphase flow flowmeter is integrated with fiber optic acoustic sensors, fibre optic compression sensor and fibre optic temperature sensor, make the integrated level of this down-hole collecting device high, thus the structure design of this down-hole multiphase flow flowmeter is simple, easy and simple to handle, applicable Oil/gas Well is gone into the well execute-in-place.Namely this down-hole multiphase flow flowmeter can reduce the corresponding working time, increases work efficiency, and reduces go into the well time, human and material resources.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structured flowchart of the down-hole multiphase flow flowmeter in one embodiment of the invention;
Fig. 2 is the schematic diagram of the down-hole multiphase flow flowmeter in one embodiment of the invention when using in down-hole;
Fig. 3 is the schematic diagram of the down-hole multiphase flow flowmeter in another embodiment of the present invention when using in down-hole;
Fig. 4 is the flow chart of the underground monitoring method in one embodiment of the invention;
Wherein, 1, down-hole collecting device; 11, fiber optic acoustic sensors; 12, fibre optic compression sensor; 13, fibre optic temperature sensor; 2, aboveground treatment facility; 21, optical-electrical converter; 22, A/D converter; 23, DSP digital processing unit; 24, fpga chip; 25, clock module; 26, reshaper; 27, counter; 3, underground optical cable; 4, down-hole string; 5, optical cable protector; 6, sleeve pipe; 7, well head; 8, instrument; 9, ground optical cable.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
Fig. 1 to Fig. 3 shows a kind of down-hole multiphase flow flowmeter in the present invention, and this down-hole multiphase flow flowmeter mainly can arrive down-hole by under one or more optical cable, and is placed on by optical demodulator aboveground.Then the data such as downhole temperature, pressure, sound wave are gathered by the Fibre Optical Sensor on optical cable, and the down-hole information collected is uploaded in optical demodulator carry out demodulation, thus obtain Underground Distributed multiphase flow rates, the information such as phase holdup, down-hole pressure, temperature.
Fig. 1 is the structured flowchart of the down-hole multiphase flow flowmeter in one embodiment of the invention.Fig. 2 is the schematic diagram of the down-hole multiphase flow flowmeter in one embodiment of the invention when using in down-hole.Fig. 3 is the schematic diagram of the down-hole multiphase flow flowmeter in another embodiment of the present invention when using in down-hole.
As shown in Figure 1, this down-hole multiphase flow flowmeter comprises down-hole collecting device 1 and aboveground treatment facility 2.The Main Function of this down-hole collecting device 1 is the data upload such as temperature, pressure, sound wave under production wells.The Main Function of this aboveground treatment facility 2 is the data that demodulation collects, to obtain Underground Distributed multiphase flow rates, and the information such as phase holdup, down-hole pressure, temperature.
Concrete, consult Fig. 1, this down-hole collecting device 1 comprises fiber optic acoustic sensors 11, fibre optic compression sensor 12 and fibre optic temperature sensor.And this fiber optic acoustic sensors 11, this fibre optic compression sensor 12 and this fibre optic temperature sensor are all arranged on the tube wall of down-hole string 4 side.Wherein, the sonic data monitored is main, and temperature data and pressure data can carry out auxiliary corrective.Because the velocity of sound of often kind of material, along with temperature and pressure change, so under the prerequisite being provided with fiber optic acoustic sensors 11, also needs to add fibre optic compression sensor 12 and fibre optic temperature sensor.
When this down-hole collecting device 1 works, the acoustic signals of this fiber optic acoustic sensors 11 transfers to this aboveground treatment facility 2; The temperature signal of this fibre optic temperature sensor transfers to this aboveground treatment facility 2; The pressure signal of this fibre optic compression sensor 12 transfers to this aboveground treatment facility 2.
Further, group number and the set-up mode of this fiber optic acoustic sensors 11, fibre optic compression sensor 12 and fibre optic temperature sensor are varied, generally, as long as the layout that can meet detection requirement is all in protection scope of the present invention.
This down-hole collecting device 1 in the present invention preferably comprises at least one group of this fiber optic acoustic sensors 11 and at least one group of this fibre optic temperature sensor.And often organize this fiber optic acoustic sensors 11 and often organize the distributed setting of the bearing of trend along this down-hole string 4 of this fibre optic temperature sensor.The fiber optic acoustic sensors 11 of distributed setting and fibre optic temperature sensor can make the operating efficiency of this down-hole collecting device 1 higher, and certainty of measurement is higher.
This down-hole collecting device 1 in the present invention preferably comprises at least one group of this fibre optic compression sensor 12.And each pressure measurement point one_to_one corresponding often organized on this fibre optic compression sensor 12 and this down-hole string 4 is arranged.The metering system of pressure is different from the metering system of temperature and sound wave.Therefore, the fibre optic compression sensor 12 of point-to-point setting can make the operating efficiency of this down-hole collecting device 1 higher, and certainty of measurement is higher.
It should be noted that, this fiber optic acoustic sensors 11 in the present invention, this fibre optic compression sensor 12 and this fibre optic temperature sensor are preferably integrated in underground optical cable 3, and this underground optical cable 3 is arranged on the tube wall of this down-hole string 4 side.The key benefit that fiber optic acoustic sensors 11, this fibre optic compression sensor 12 and this fibre optic temperature sensor are integrated in underground optical cable 3 is, this underground optical cable 3 not only can down to being slightly deeper than Oil/gas Well payzone, also bottom Oil/gas Well, then fiber optic acoustic sensors 11, this fibre optic compression sensor 12 and this fibre optic temperature sensor can be integrated in distributed collection and transmission that underground optical cable 3 is conducive to downhole data.
Understandably, this fiber optic acoustic sensors 11, fibre optic compression sensor 12 and fibre optic temperature sensor, and underground optical cable 3 can high temperature high voltage resistant.Wherein, long-term pressure is not less than 150MPa, and long-term heatproof is the highest 300 DEG C.
In addition, each Fibre Optical Sensor of this underground optical cable 3, namely as optical signal transmission passage, is also optical pickocff simultaneously.The underground optical cable 3 of this down-hole collecting device 1, except being integrated with fiber optic acoustic sensors 11, fibre optic compression sensor 12 and fibre optic temperature sensor, can also be integrated with the Fibre Optical Sensor of other types.
As shown in Figures 2 and 3, above-mentioned underground optical cable 3 is just fixed on this down-hole string 4 by multiple optical cable protector 5, and this optical cable protector 5 multiple distributes along the bearing of trend of this underground optical cable 3.Wherein, down-hole string 4 comprises oil pipe, coiled tubing, sucker rod, sleeve pipe 6 etc.The quantity of this optical cable protector 5 and setting position are indefinite; such as; just employ two optical cable protectors 5 in Fig. 2 underground optical cable 3 is fixed on down-hole string 4, and just employ four optical cable protectors 5 in Fig. 3 underground optical cable 3 is fixed on down-hole string 4.Certainly, as long as can reach accurate fixed effect, the optical cable protector 5 of any amount and arrangement thereof are all in protection scope of the present invention.
When above-mentioned underground optical cable 3 is gone into the well separately, Special counterweight mechanism need be adopted.This Special counterweight mechanism can ensure that underground optical cable 3 does not block and time, and not pitch of the laps, does not wear and tear, and does not affect its optical sensing and signal transmission performance.And in conjunction with this Special counterweight mechanism, also must have special downhole technique, thus ensure safety in the process of going into the well of this underground optical cable 3 and Fibre Optical Sensor wherein and performance.
Consult Fig. 2 and Fig. 3 again, when the device that this underground optical cable 3 passes through well head 7 is connected with ground optical cable 9, in crossing process, be provided with sealing device special seal well head 7, be not less than 150MPa, the requirement of the highest 300 DEG C of long-term heatproof to meet this underground optical cable 3 long-term pressure.In addition, for the sake of security, in crossing process, well head 7 place is also provided with optical cable blowout hookup.And generally, well head 7 place is also provided with the instrument such as flow 8.
Consult Fig. 1 again, this aboveground treatment facility 2 comprises optical-electrical converter 21, A/D converter 23 and DSP digital processing unit 23.This optical-electrical converter 21 is connected with this down-hole collecting device 1, and it is mainly used in the data receiving this down-hole collecting device 1, and is converted into the signal of telecommunication.This A/D converter 23 is connected with this optical-electrical converter 21, and it is mainly used in converting this signal of telecommunication to data signal and exporting.This DSP digital processing unit 23 is connected with this A/D converter 23, and it is mainly used in receiving this data signal and processing.
Further, this aboveground treatment facility 2 also comprises the fpga chip 24 be connected with this DSP digital processing unit 23.The Main Function of this fpga chip 24 is further to calculate the data after the preliminary computing of DSP digital processing unit 23 digital processing unit 23.
The engineering process of this aboveground treatment facility 2 is as follows:
Underground optical cable 3 collects the information such as Acoustic, temperature, pressure and is transferred in aboveground treatment facility 2 by ground optical cable 9, this aboveground treatment facility 2 is by optical-electrical converter 21, optical signal is converted into the signal of telecommunication, digital-to-analogue conversion is carried out subsequently by A/D converter 23, data signal after conversion enters in DSP digital processing unit 23 carries out computing, data after the preliminary computing of DSP digital processing unit 23 are imported in fpga chip 24 and are finally calculated, and draw the information such as Underground Distributed multiphase flow rates, phase holdup, temperature, pressure.
Wherein, Acoustic refers to the various voice signals that downhole production causes, as liquid, gas flowing, tubing string collision, with fluid friction etc.In addition, Underground Distributed multiphase flow rates and phase holdup, refer to and can obtain distributed downhole flow, and the phase holdup of locality.Phase holdup refers to the ratio of oil gas water, and this phase holdup is important monitored data.
And generally, above-mentioned aboveground treatment facility 2 is Optical Demodulation instrument, Optical Demodulation instrument can be multiple stage also can be integrated form.Mainly can carry out demodulation to the optical signal that underground optical cable 3 transmits, recover the information such as the temperature of Underground Distributed, pressure, sound wave, to the accessibility well end of underground optical cable 3.
In certain embodiments, consult Fig. 1, this aboveground treatment facility 2 also comprises clock module 25.This clock module 25 is connected with this down-hole collecting device 1, and the control end of this clock module 25 is connected with this DSP digital processing unit 23, records to control this clock module 25 by this DSP digital processing unit 23 or reads acquisition time.
In certain embodiments, consult Fig. 1, this aboveground treatment facility 2 also can comprise reshaper 26 sum counter 27.Wherein, reshaper 26 is connected with this optical-electrical converter 21, and this reshaper 26 is mainly used in this voltage signal to be shaped as pulse signal.The input of counter 27 is connected with this reshaper 26, and the output of counter 27 is connected with this DSP digital processing unit 23, and this counter 27 is mainly used in counting this pulse signal and transfers to this DSP digital processing unit 23.
In certain embodiments, this aboveground treatment facility 2 also can comprise display module, and the Main Function of this display module is that, to Underground Distributed multiphase flow rates, the information such as phase holdup, down-hole pressure, temperature show, to realize monitoring.
To sum up, the down-hole multiphase flow flowmeter in the present invention has following beneficial effect:
This down-hole multiphase flow flowmeter can realize the measuring multiple parameters such as downhole flow, phase holdup, temperature, pressure without the need to carrying out separation to downhole fluid.
This down-hole multiphase flow flowmeter when without the need to mobile underground optical cable 3 and Fibre Optical Sensor wherein, can realize full well measurements.
The high temperature high voltage resistant 150MPa of this down-hole multiphase flow flowmeter own, 300 DEG C.The integrated level of this down-hole multiphase flow flowmeter is high, intervenes few, generally go into the well with the underground optical cable 3 of 1/4 inchage, once go into the well, permanent monitoring down-hole.
Can integrated multiple optical pickocff on a underground optical cable 3 of this down-hole multiphase flow flowmeter.
This down-hole multiphase flow flowmeter is applicable to straight well, high angle hole, horizontal well, can measure heterogeneous, two-phase, single-phase etc.
The structure design of this down-hole multiphase flow flowmeter is simple, easy and simple to handle, and applicable Oil/gas Well is gone into the well execute-in-place.Namely this down-hole multiphase flow flowmeter can reduce the corresponding working time, increases work efficiency, and reduces go into the well time, human and material resources.
Fig. 4 also show a kind of underground monitoring method in the present invention, and this underground monitoring method is mainly used in above-mentioned down-hole multiphase flow flowmeter.
Fig. 4 is the flow chart of the underground monitoring method in one embodiment of the invention.As shown in Figure 4, this underground monitoring method comprises the steps:
S1, down-hole collecting device 1 is integrated into underground optical cable 3, and by this underground optical cable 3 down in Oil/gas Well;
S2, utilize the fiber optic acoustic sensors 11 in this down-hole collecting device 1, fibre optic compression sensor 12, fibre optic temperature sensor to gather downhole data, and this downhole data collected is transferred in aboveground treatment facility 2 by ground optical cable 9;
Wherein, downhole data comprises downhole temperature, pressure, sound wave etc.
S3, this aboveground treatment facility 2, according to this downhole data got and built-in computation model, draw down-hole actual characteristic value;
Wherein, down-hole actual characteristic value comprises downhole flow, phase holdup, down-hole pressure, temperature etc.
Concrete, wherein down-hole pressure numerical value, Temperature numerical can obtain for directly measuring.The information of acoustic wave recorded is through calculating down-hole forward velocity of sound V+, oppositely velocity of sound V-, mixing velocity of sound V.
Downhole flow and phase holdup is tried to achieve by the velocity of sound.Its technology formula is as follows:
Wherein, if oil gas aqueous mixtures is 1,
for gas accounting,
for water accounting,
for oily accounting;
ρ
gfor the density of gas, ρ
wfor the density of water, ρ
ofor the density of oil;
V
gfor the velocity of sound of gas, V
wfor the velocity of sound of water, V
ofor the velocity of sound of oil;
After trying to achieve velocity of sound V, by a computation model, just phase fraction φ i, phase-splitting density p i and phase-splitting velocity of sound Vi can be tried to achieve respectively.
In addition, volume flow rate Q
ocan be tried to achieve by forward velocity of sound V+ and reverse velocity of sound V-equally.Namely
It should be noted that, above-mentioned numerical value of trying to achieve can be revised by down-hole pressure numerical value and Temperature numerical.
S4, by display module, this down-hole actual characteristic value to be shown, to realize monitoring.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various change, combination and change.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (10)
1. a down-hole multiphase flow flowmeter, is characterized in that, comprises down-hole collecting device (1) and aboveground treatment facility (2);
Described down-hole collecting device (1) comprises fiber optic acoustic sensors (11), fibre optic compression sensor (12) and fibre optic temperature sensor;
Described fiber optic acoustic sensors (11), described fibre optic compression sensor (12) and described fibre optic temperature sensor are all arranged on the tube wall of down-hole string (4) side;
The acoustic signals of described fiber optic acoustic sensors (11) transfers to described aboveground treatment facility (2); The temperature signal of described fibre optic temperature sensor transfers to described aboveground treatment facility (2); The pressure signal of described fibre optic compression sensor (12) transfers to described aboveground treatment facility (2).
2. down-hole according to claim 1 multiphase flow flowmeter, is characterized in that, described down-hole collecting device (1) comprises fiber optic acoustic sensors described at least one group (11) and fibre optic temperature sensor described at least one group;
Often organize described fiber optic acoustic sensors (11) and often organize the distributed bearing of trend along described down-hole string (4) of described fibre optic temperature sensor and arrange.
3. down-hole according to claim 2 multiphase flow flowmeter, is characterized in that, described down-hole collecting device (1) comprises fibre optic compression sensor described at least one group (12);
Often organize described fibre optic compression sensor (12) to arrange with each pressure measurement point one_to_one corresponding on described down-hole string (4).
4. the down-hole multiphase flow flowmeter according to any one of claims 1 to 3, it is characterized in that, described fiber optic acoustic sensors (11), described fibre optic compression sensor (12) and described fibre optic temperature sensor are integrated in underground optical cable (3), and described underground optical cable (3) is arranged on the tube wall of described down-hole string (4) side.
5. down-hole according to claim 4 multiphase flow flowmeter; it is characterized in that; described underground optical cable (3) is fixed on described down-hole string (4) by multiple optical cable protector (5), and multiple described optical cable protector (5) distributes along the bearing of trend of described underground optical cable (3).
6. down-hole according to claim 4 multiphase flow flowmeter, is characterized in that, described aboveground treatment facility (2) comprises
Optical-electrical converter (21), is connected with described down-hole collecting device (1), for receiving the data of described down-hole collecting device (1), and is converted into the signal of telecommunication;
A/D converter (23), is connected with described optical-electrical converter (21), for converting the described signal of telecommunication to data signal and exporting;
DSP digital processing unit (23), is connected with described A/D converter (23), for receiving described data signal and processing.
7. down-hole according to claim 6 multiphase flow flowmeter, is characterized in that, described aboveground treatment facility (2) also comprises the fpga chip (24) be connected with described DSP digital processing unit (23).
8. down-hole according to claim 6 multiphase flow flowmeter, is characterized in that, described aboveground treatment facility (2) also comprises clock module (25);
Described clock module (25) is connected with described down-hole collecting device (1), and the control end of described clock module (25) is connected with described DSP digital processing unit (23), to be controlled described clock module (25) record by described DSP digital processing unit (23) or to read acquisition time.
9. down-hole according to claim 6 multiphase flow flowmeter, is characterized in that, described aboveground treatment facility (2) also comprises
Reshaper (26), is connected with described optical-electrical converter (21), for the described signal of telecommunication is shaped as pulse signal;
Counter (27), input is connected with described reshaper (26), and output is connected with described DSP digital processing unit (23), for counting described pulse signal and transferring to described DSP digital processing unit (23).
10. a underground monitoring method, is characterized in that, comprises the steps:
S1, down-hole collecting device (1) is integrated into underground optical cable (3), and by described underground optical cable (3) down in Oil/gas Well;
S2, the fiber optic acoustic sensors (11) utilized in described down-hole collecting device (1), fibre optic compression sensor (12), fibre optic temperature sensor gather downhole data, and are transferred in aboveground treatment facility (2) by the described downhole data collected by ground optical cable (9);
S3, described aboveground treatment facility (2), according to the described downhole data got and built-in computation model, draw down-hole actual characteristic value;
S4, by display module, described down-hole actual characteristic value to be shown, to realize monitoring.
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