CN108729868B - Deep sea drilling overflow and lost circulation monitoring method - Google Patents
Deep sea drilling overflow and lost circulation monitoring method Download PDFInfo
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- CN108729868B CN108729868B CN201810516779.0A CN201810516779A CN108729868B CN 108729868 B CN108729868 B CN 108729868B CN 201810516779 A CN201810516779 A CN 201810516779A CN 108729868 B CN108729868 B CN 108729868B
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
Abstract
The invention relates to a deep sea drilling overflow and lost circulation monitoring method, which comprises the following steps: 1) the method comprises the following steps that a first mass flowmeter is arranged at an inlet of a drilling circulation system, a second mass flowmeter is arranged at an outlet of the drilling circulation system, the first mass flowmeter and the second mass flowmeter respectively collect mass flow data at the inlet and the outlet of the drilling circulation system in real time, and the collected data are transmitted to a data processing and analyzing end; 2) the data processing and analyzing end processes mass flow data at the inlet and the outlet of the drilling circulation system, so that the overflow condition of the drilling is monitored in real time: 3) and the data processing and analyzing end processes mass flow data at the inlet and the outlet of the drilling circulation system, so that the well leakage condition of the drilling well is monitored in real time.
Description
Technical Field
The invention relates to a deep sea drilling overflow and lost circulation monitoring method, and belongs to the field of offshore oil development.
Background
Overflow and well leakage often occur in deep sea drilling operation, if the overflow and the well leakage cannot be found in time, disastrous results can be caused, and therefore early deep sea drilling overflow and well leakage monitoring technologies are more and more concerned. With the rapid development of the drilling industry, a plurality of overflow and lost circulation monitoring methods are available, but the monitoring precision of the methods is not high enough, and the overflow and lost circulation can not be monitored in time. Relevant research shows that the judgment of whether the overflow and the well leakage occur or not is more accurate and effective by monitoring the change of the mass flow.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for monitoring overflow and lost circulation of deep sea drilling with higher accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme: a deep sea well drilling overflow and lost circulation monitoring method comprises the following steps:
1) the method comprises the following steps that a first mass flowmeter is arranged at an inlet of a drilling circulation system, a second mass flowmeter is arranged at an outlet of the drilling circulation system, the first mass flowmeter and the second mass flowmeter respectively collect mass flow data at the inlet and the outlet of the drilling circulation system in real time, and the collected data are transmitted to a data processing and analyzing end;
2) the data processing and analyzing end processes the mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the overflow condition of the drilling well:
① sets a series of time nodes ti(i ═ 0,1, 2.., n), at tiThe mass flow of the drilling inlet corresponding to the moment is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiInstantaneous overflow Δ Qi＝(Qoi-Qpi)；
② calculating the value from t0To tnTotal overflow Q at a timegasinThereby monitoring the change of the total overflow volume at different times:
③ when the overflow variation within the time interval dt is Δ Q, t is obtainediInstantaneous overflow rate of change VcThereby monitoring the overflow rate at any time:
3) the data processing and analyzing end processes the mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the well leakage condition of the drilling well:
① sets a series of time nodes ti(i ═ 0,1, 2.., n), at tiThe mass flow of the drilling inlet corresponding to the moment is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiLeakage amount Δ Q at timei′＝(Qpi-Qoi)；
② calculating the value from t0To tnTotal leakage Q of timelossThus, the change of the gross loss of the lost circulation at different moments is monitored:
③ if the leakage amount variation within the time interval dt is Δ Q', t is obtainediRate of change of leakage at time Vc', whereby the leak rate at any time is monitored:
the first mass flowmeter and the second mass flowmeter both adopt Coriolis mass flowmeters.
The inlet of the first mass flow meter is connected with the drilling inlet main pipe through a first valve, the outlet of the first mass flow meter is connected with the drilling inlet main pipe through a second valve, and a third valve is arranged on the drilling inlet main pipe between the inlet and the outlet of the first mass flow meter; the inlet of the second mass flow meter is connected with the drilling outlet main pipe through a fourth valve, the outlet of the second mass flow meter is connected with the drilling outlet main pipe through a fifth valve, and a sixth valve is arranged on the drilling outlet main pipe between the inlet and the outlet of the second mass flow meter.
Due to the adoption of the technical scheme, the invention has the following advantages: the first mass flow meter and the second mass flow meter are arranged at the drilling inlet and the drilling outlet to monitor the flow change of the inlet and the outlet, and the change conditions of the overflow volume and the leakage volume in the shaft are further monitored through the flow change, so that the overflow and the lost circulation of the deep sea drilling are timely and accurately monitored.
Drawings
FIG. 1 is a schematic representation of the flow conditions during drilling when gas cut (the cause of a kick) occurs;
FIG. 2 is a schematic view of the flow conditions during drilling when lost circulation occurs;
fig. 3 is a schematic diagram of a coriolis mass flowmeter.
The reference numerals in the figures have the following meanings:
1. a mud pit; 2. drilling fluid; 3. a slurry pump line; 4. a slurry pump; 5. a first mass flow meter; 51. a measurement tube; 52. a sensor; 53. a vibration exciter; 54. a flange plate; 6. a third valve; 7. a second valve; 8. a first valve; 9. a first mass flow meter support; 10. a riser; 11. rotating the control head; 12. a diverter; 13. a blowout preventer stack; 14. a drill stem; 15. a drill bit; 16. a drill water hole; 17. a wellbore; 18. an earth formation; 19. a second mass flow meter; 20. a sixth valve; 21. a fourth valve; 22. a fifth valve; 23. a second mass flow meter support; 24. a throttle line; 25. a drilling fluid outlet; 26. a sensor data line; 27. a data processing and analyzing end; 28. a drilling platform; 29. a tension cord; 30. an expansion joint; 31. a riser; 32. seawater, 33, gas cut formation location; 34. a lost circulation formation location.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The invention provides a method for monitoring deep sea drilling overflow and lost circulation, which comprises the following steps:
1) as shown in fig. 1 and 2, a first mass flow meter is arranged at an inlet of the drilling circulation system, a second mass flow meter is arranged at an outlet of the drilling circulation system, and the first mass flow meter and the second mass flow meter respectively acquire mass flow data at the inlet and the outlet of the drilling circulation system in real time and transmit the acquired data to a data processing and analyzing end.
2) The data processing and analyzing end processes the mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the overflow condition of the drilling well:
① sets a series of time nodes ti(i ═ 0,1, 2.., n), at tiThe mass flow of the drilling inlet corresponding to the moment is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiInstantaneous overflow Δ Qi＝(Qoi-Qpi)；
② so that t can be calculated0To tnTotal overflow Q at a timegasinFrom this, can monitor the change of total overflow volume at different moments:
③ assuming a delta of overflow Δ Q over time interval dt, t can be obtainediInstantaneous overflow rate of change VcThe overflow rate at any time can thus be monitored:
3) the data processing and analyzing end processes the mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the well leakage condition of the drilling well:
① sets a series of time nodes ti(i ═ 0,1, 2.., n), at tiDrilling inlet mass flow corresponding to timeAmount is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiLeakage amount Δ Q at timei′＝(Qpi-Qoi)；
② so that t can be calculated0To tnTotal leakage Q of timelossTherefore, the change of the gross leakage of the well leakage at different moments can be monitored:
③ assuming a leakage variation of Δ Q' over time interval dt, t can be obtainediRate of change of leakage at time VcFrom this, the leak rate at any time can be monitored:
depending on the leak rate, the leak may be classified into 5 levels, specifically, the leak rate is less than 5m3The leakage rate is 5-15 m3The leakage rate is 15-30 m3The leakage rate is 30-60 m3The leakage rate is more than 60m3The/h is a severe drop-out.
In the above embodiment, the first mass flow meter 5 and the second mass flow meter 19 each employ a coriolis mass flow meter. Wherein, the inlet of the first mass flow meter 5 is connected with the drilling inlet manifold through a first valve 8 (as shown in fig. 3), the outlet of the first mass flow meter 5 is connected with the drilling inlet manifold through a second valve 7, and a third valve 6 is arranged on the drilling inlet manifold between the inlet and the outlet of the first mass flow meter 5; the inlet of the second mass flow meter 19 is connected to the drilling outlet manifold via a fourth valve 21, the outlet of the second mass flow meter 19 is connected to the drilling outlet manifold via a fifth valve 22, and a sixth valve 20 is arranged in the drilling outlet manifold between the inlet and the outlet of the second mass flow meter 19. The first valve 8, the second valve 7 and the third valve 6 are used for controlling whether the drilling fluid flows through the first mass flow meter 5, when the third valve 6 is opened and the first valve 8 and the second valve 7 are closed, the drilling fluid does not flow through the first mass flow meter 5, and the first mass flow meter 5 does not work; when the third valve 6 is closed and the first valve 8 and the second valve 7 are open, drilling fluid flows through the first mass flow meter 5 and the first mass flow meter 5 starts to operate. The fourth valve 21, the fifth valve 22 and the sixth valve 20 are used for controlling whether the drilling fluid flows through the second mass flow meter 19 or not, when the sixth valve 20 is opened and the fourth valve 21 and the fifth valve 22 are closed, the drilling fluid does not flow through the second mass flow meter 19, and the second mass flow meter 19 does not work; when the sixth valve 20 is closed and the fourth valve 21 and the fifth valve 22 are open, the drilling fluid flows through the second mass flow meter 19 and the second mass flow meter 19 starts to operate.
The working principle of the invention is as follows: drilling fluid is stored in the mud pit 1, drilling fluid 2 is injected by a mud pump 4 through a mud pump line 3 into the riser 10 (during which flow information is transmitted through a first mass flow meter 5 to a data processing and analysis end 27 via a sensor data line 26), then through the drill string 14 and the drill bit port 16 into the wellbore 17, and then circulated up the wellbore 17 to the wellhead, after flowing through the blowout preventer 13 and diverter 12, through a second mass flow meter 19 (which transmits flow information to a data acquisition and data processing and analysis end 27 via the sensor data line 26) and a choke line 24 back to the mud pit 1. The change condition of the shaft leakage amount is monitored through the change rule of the mass flow at the inlet and the outlet.
The above embodiments are only used for illustrating the present invention, and the implementation steps of the method and the like can be changed, and all equivalent changes and modifications based on the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (2)
1. A deep sea well drilling overflow and lost circulation monitoring method comprises the following steps:
1) the method comprises the following steps that a first mass flowmeter is arranged at an inlet of a drilling circulation system, a second mass flowmeter is arranged at an outlet of the drilling circulation system, the first mass flowmeter and the second mass flowmeter respectively collect mass flow data at the inlet and the outlet of the drilling circulation system in real time, and the collected data are transmitted to a data processing and analyzing end; the inlet of the first mass flow meter is connected with the drilling inlet main pipe through a first valve, the outlet of the first mass flow meter is connected with the drilling inlet main pipe through a second valve, and a third valve is arranged on the drilling inlet main pipe between the inlet and the outlet of the first mass flow meter; the inlet of the second mass flow meter is connected with the drilling outlet main pipe through a fourth valve, the outlet of the second mass flow meter is connected with the drilling outlet main pipe through a fifth valve, and a sixth valve is arranged on the drilling outlet main pipe between the inlet and the outlet of the second mass flow meter;
2) the data processing and analyzing end processes mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the overflow condition of the drilling well in real time:
① sets a series of time nodes tiI is 0,1,2, 1, n, at tiThe mass flow of the drilling inlet corresponding to the moment is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiInstantaneous overflow Δ Qi＝(Qoi-Qpi)；
② calculating the value from t0To tnTotal overflow Q at a timegasinThereby monitoring the change of the total overflow volume at different times:
③ when the overflow variation within the time interval dt is Δ Q, t is obtainediInstantaneous overflow rate of change VcThereby monitoring the overflow rate at any time:
3) the data processing and analyzing end processes the mass flow data at the inlet and the outlet of the drilling circulation system as follows, thereby monitoring the well leakage condition of the drilling well in real time:
① sets a series of time nodes tiI is 0,1,2, 1, n, at tiThe mass flow of the drilling inlet corresponding to the moment is QpiCorresponding to a drilling outlet mass flow of QoiThen t isiLeakage amount at time Δ Q'i＝(Qpi-Qoi)；
② calculating the value from t0To tnTotal leakage Q of timelossThus, the change of the gross loss of the lost circulation at different moments is monitored:
③ if the leakage amount variation within the time interval dt is Δ Q', t is obtainediRate of change of leakage at time Vc', whereby the leak rate at any time is monitored:
2. the deep sea well bore overflow and lost circulation monitoring method of claim 1, wherein: the first mass flowmeter and the second mass flowmeter both adopt Coriolis mass flowmeters.
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| CN109538142A (en) * | 2018-12-31 | 2019-03-29 | 中石化石油工程技术服务有限公司 | One kind being used for indoor mud flow rate detection device and its detection method |
| CN110454151A (en) * | 2019-07-24 | 2019-11-15 | 中国石油集团川庆钻探工程有限公司 | Enter the active detection method of strata condition with brill drilling fluid leakage |
| CN111364978B (en) * | 2020-03-02 | 2022-06-14 | 中国海洋石油集团有限公司 | Well kick and leakage monitoring device and monitoring method |
| CN111502640B (en) * | 2020-04-22 | 2022-11-15 | 中国海洋石油集团有限公司 | Device and method for measuring formation pore pressure and leakage pressure |
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| CN201269093Y (en) * | 2008-10-23 | 2009-07-08 | 大庆石油管理局 | Well-control blowout prevention early-warning apparatus |
| CN101696627A (en) * | 2009-10-30 | 2010-04-21 | 湖北工业大学 | Accident monitoring method in welldrilling process |
| CN202108504U (en) * | 2011-06-17 | 2012-01-11 | 中国石油集团川庆钻探工程有限公司 | Forecast system for flow difference, well kick and lost circulation |
| CN103104245A (en) * | 2011-11-11 | 2013-05-15 | 刘剑国 | Sensor used for measuring mud density and mass flow rate |
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