CN105937375B - The underbalance well drilling plant and method of biphase gas and liquid flow flow segmentation real-time monitoring - Google Patents
The underbalance well drilling plant and method of biphase gas and liquid flow flow segmentation real-time monitoring Download PDFInfo
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- CN105937375B CN105937375B CN201610410881.3A CN201610410881A CN105937375B CN 105937375 B CN105937375 B CN 105937375B CN 201610410881 A CN201610410881 A CN 201610410881A CN 105937375 B CN105937375 B CN 105937375B
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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
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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
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
Abstract
The present invention provides the underbalance well drilling plants and method of a kind of biphase gas and liquid flow flow segmentation real-time monitoring, and the underbalance well drilling plant which is segmented real-time monitoring includes under balance pressure drilling system (101) and choke manifold (102)；Under balance pressure drilling system (101) contains the first pressure sensor (4) being sequentially connected in series on the first pipeline (20), first manual flap type (6), the throttle valve that surges (5), mass flowmenter (14), and under balance pressure drilling system (101) also contains control centre (13) and signal transceiver (3).Outlet biphase gas and liquid flow segmentation real-time measurement is carried out using the underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring, and well head pressure adjustment is carried out based on changes in flow rate, can effectively solve the problem that narrow Density Window, spray leakage with the borehole problems such as depositing.
Description
Technical field
Originally it is related to petroleum, gas drilling flow real-time monitoring and pressure automatic control technology field, it is particularly a kind of
The underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring or a kind of underbalance of biphase gas and liquid flow flow monitoring
Boring method.
Background technique
As oil exploration develops to deep layer, bad ground, narrow Density Window, spray leakage with deposit etc. undergrounds complexity increasingly at
For current main drilling well problem.Under-balanced drilling technology is that one to solve the above problems creeps into skill sharp weapon, but based on underbalance
The biphase gas and liquid flow flow real-time segmentation monitoring of art, the automatic real-time adjustment of well head pressure are the main bugbears faced at present.
Summary of the invention
In order to solve the problems, such as that cannot achieve well head pressure in existing underbalance drilling technology adjusts in real time automatically, this hair
It is bright to provide the underbalance well drilling plant and control method of a kind of biphase gas and liquid flow flow segmentation real-time monitoring, using the gas-liquid two
Mutually the underbalance well drilling plant of stream flow segmentation real-time monitoring carries out outlet biphase gas and liquid flow segmentation real-time measurement, and is based on flow
Variation carries out well head pressure adjustment, can effectively solve the problem that narrow Density Window, spray leakage with the borehole problems such as depositing.
The technical solution adopted by the present invention to solve the technical problems is：A kind of biphase gas and liquid flow flow segmentation real-time monitoring
Underbalance well drilling plant, including under balance pressure drilling system and choke manifold；
Under balance pressure drilling system contains the first pressure sensor being sequentially connected in series on the first pipeline, first manual plate
Valve, the throttle valve that surges, mass flowmenter, under balance pressure drilling system also contain control centre and signal transceiver, and first pressure passes
Sensor surges throttle valve and mass flowmenter is connect with signal transceiver, and signal transceiver is connect with control centre；In control
The heart is connect with the standpipe pressure sensor on drilling well-head, and control centre also connect with the gas flowmeter outside drilling well-head；
Choke manifold contains a plurality of pipeline, and the first pipeline is connected by the suction line of connecting pipeline and choke manifold, even
For the arrival end of adapter tube line between first pressure sensor and first manual flap type, connecting pipeline is equipped with valve.
The arrival end of first pipeline is connect with the swivel control head hydraulic operated valve of wellhead blowout preventor group, the outlet end of the first pipeline
It is connect with the arrival end of liquid-gas separator, the arrival end of the suction line of choke manifold and the liquid-operated flat valve of wellhead blowout preventor group
Connection, the outlet end of the first pipeline of choke manifold are also connect with the arrival end of liquid-gas separator, gas flowmeter and liquid gas point
Gas vent connection from device.
On the first pipeline, it is provided with first manual flap type between first pressure sensor and the throttle valve that surges, surges
It is provided with the first ball valve between throttle valve and mass flowmenter, is set gradually between mass flowmenter and the outlet end of the first pipeline
There are the second ball valve and second pressure sensor.
The second manual flat valve, the first ball valve, matter are provided between second pressure sensor and the outlet end of the first pipeline
Amount flowmeter and the second ball valve are parallel with third manual flat valve.
Choke manifold also contains the second pipeline, third pipeline and four-way, and suction line passes through four-way and the first pipe in parallel
Road, the second pipeline and third piping connection.
A kind of under balance pressure drilling method of biphase gas and liquid flow flow monitoring, the underbalance of the biphase gas and liquid flow flow monitoring
Boring method uses the underbalance well drilling plant of above-mentioned biphase gas and liquid flow flow segmentation real-time monitoring, the biphase gas and liquid flow
The under balance pressure drilling method of flow monitoring includes the following steps：
Step 1, control centre's real-time monitoring standpipe pressure sensor, first pressure sensor, mass flowmenter and gas
The signal data that flowmeter issues, valve are in normally off；
The signal data is generated the change curve of data value and time relationship, root by step 2, control centre correspondingly
During judging difference locating for drillng operation according to the change curve, the specific period control centre according to locating for the drillng operation is logical
Cross the aperture that signal transceiver controls the throttle valve that surges.
In step 2, when the numerical value of every change curve is within the scope of normal drilling values, drillng operation is in just
Often during drilling, the aperture by controlling the throttle valve that surges makes well head pressure in normal range.
In step 2, when the numerical value of the change curve corresponding with standpipe pressure sensor reduces, and and mass flow
When counting the numerical value of the corresponding change curve and remaining unchanged, during drillng operation is in gas cut, during the gas cut include with
Lower step：
Step 2.1a, control centre calculate target stand pressure value, target flow value, permission pressure-difference fluctuation value range；
Step 2.2a, work as P1-Psp<P2, control centre, which issues, increases the instruction of throttle valve opening of surging；Work as Psp-P1>P2
When, control centre, which issues, reduces throttle valve opening instruction of surging；
P1Pressure value, unit MPa are found for target；P2For permissible pressure fluctuation range value, unit MPa；PspFor standpipe pressure
Power, unit MPa；
Step 2.3a, after one section of lagged time, work as Q1>When Q, control centre, which issues, increases the throttle valve opening that surges
Instruction；Work as Q1<When Q, control centre, which issues, reduces throttle valve opening instruction of surging；
Q1For target flow value, unit kg/s；Q is actual flow value, unit kg/s.
In step 2, when the numerical value of the change curve corresponding with standpipe pressure sensor reduces, and and mass flow
When counting the corresponding change curve and square wave occur, it includes following during the grease is invaded that drillng operation, which is in during grease invades,
Step：
Step 2.1b, control centre calculate target found target flow value during pressure value, grease are invaded, allow allow to flow
Measure fluctuation range difference；
Step 2.2b, work as Q1-Q<Q2When, control centre issues the instruction for increasing the throttle valve opening that surges；Work as Q1-Q>Q2
When, control centre, which issues, reduces throttle valve opening instruction of surging；
Q1For target flow value, unit kg/s；Q2To allow flowed fluctuation range difference, unit kg/s；Q is practical
Flow value, unit kg/s；
Step 2.3b, after one section of lagged time, work as P1<PsWhen, control centre, which issues, increases the throttle valve opening that surges
Instruction；Work as P1>PspWhen, control centre, which issues, reduces throttle valve opening instruction of surging；
P1Pressure value, unit MPa are found for target；P2For permissible pressure fluctuation range value, unit MPa；PspFor standpipe pressure
Power.
When the numerical value continuous rise of the change curve corresponding with mass flowmenter, drillng operation is in the huge discharge phase
Between, include the following steps during the huge discharge：
Step 2.1b, control centre calculates the target flow value during huge discharge；
Step 2.2b, work as Q3-Q<Q2When, open choke manifold early gate；Work as Q3-Q>Q2, open valve before choke manifold
Door closes first manual flap type；
Q2To allow flowed fluctuation range difference, unit kg/s；Q is actual flow value, unit kg/s；Q3To arrange greatly
Target flow value during amount, unit kg/s.
The beneficial effects of the invention are as follows：
1, the underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring is able to carry out outlet biphase gas and liquid flow
It is segmented real-time measurement, and overflow type is judged based on changes in flow rate and issues early warning, avoids the generation of complex working condition；
2, using high-precision mass flowmenter can real-time monitoring rate of discharge change, can independently be measured using gas flowmeter
Pit shaft gas output and outgassing rate, the data on flows based on segmentation can hydraulic analogy calculate annular space liquid column hydrostatic pressure variation, adjustment
Correct well head pressure；
3, the throttle valve that surges is used only in the underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring, can
The demand for realizing the different drilling conditions such as normal drilling, different types of overflow processing, huge discharge variation, simplifies under balance pressure drilling
Device and structure, are greatly reduced equipment cost；
4, using choke manifold as second outlet, drilling crew's resource had both been taken full advantage of, had been in turn ensured under huge discharge variation
First second channel can open adaptation changes in flow rate simultaneously, while avoid frequently switching on the works such as preventer progress circulating with choke exhaust
Industry reduces nonproductive time, simplifies controlled pressure drilling device, reduces well control risk.
5, using elevation computation software and logic judgment system, set target pressure value and flow are needed according to operating condition
Value, pressure automatic tracing, flow real-time monitoring, the various techniques of adaptive drilling team, operating condition.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is the use state diagram of the underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring.
Fig. 2 is the schematic diagram of under balance pressure drilling system and choke manifold.
Fig. 3 is the schematic diagram of square-wave curve.
Appended drawing reference in figure：
101, under balance pressure drilling system；102, choke manifold；103, wellhead blowout preventor group；
1, standpipe pressure sensor；2, swivel control head hydraulic operated valve；3, signal transceiver；4, first pressure sensor；5,
Surge throttle valve；6, first manual flap type；7, valve；8, third manual flat valve；9, the first ball valve；10, the second ball valve；
11, second pressure sensor；12, the second manual flat valve；13, control centre；14, mass flowmenter；15, liquid-gas separator；
16, gas flowmeter；17, liquid-operated flat valve；18, signal wire；19, four-way；20, the first pipeline；21, the first pipeline；22, second
Pipeline；23, third pipeline；24, connecting pipeline；25, the suction line of choke manifold；W1, drilling spool；W2, double disc blowout prevention
Device；W3, single ram type perventer；W4, annular preventer；W5, swivel control head.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring, including under balance pressure drilling system 101
With choke manifold 102；Under balance pressure drilling system 101 contains the first pressure sensor 4 being sequentially connected in series on the first pipeline 20, the
One manual flat valve 6, the throttle valve 5 that surges, mass flowmenter 14, under balance pressure drilling system 101 is also containing control centre 13 and letter
Number sending and receiving stations 3, first pressure sensor 4 surge throttle valve 5 and mass flowmenter 14 is connect with signal transceiver 3, and signal is received
Hair platform 3 is connect with control centre 13；Control centre 13 connect with the standpipe pressure sensor 1 on drilling well-head, control centre 13
Also it is connect with the gas flowmeter 16 outside drilling well-head；Choke manifold 102 contains a plurality of pipeline, and the first pipeline 20 passes through connecting tube
Line 24 is connect with the suction line 25 of choke manifold, and the arrival end of connecting pipeline 24 is located at first pressure sensor 4 and first-hand
Between dynamic flap type 6, connecting pipeline 24 is equipped with valve 7, as depicted in figs. 1 and 2.
Contain data acquisition unit, hydraulic analogy computing unit, logic judgment unit and control unit in control centre 13,
Data acquisition unit, hydraulic analogy computing unit and logic judgment unit are connect with control unit.The data of control centre 13
Acquisition unit can receive the measurement data signals that signal transceiver 3, standpipe pressure sensor 1 and gas flowmeter 16 issue.
The measurement data signals that signal transceiver 3 can receive first pressure sensor 4 and mass flowmenter 14 issues, signal transceiver
3 can also issue opening size control signal to the throttle valve 5 that surges to control the aperture for the throttle valve 5 that surges.High-precision matter
It measures flowmeter 14 and carries out fluid flow real-time measurement, gas flowmeter 16 is returned out gas flow measurement, with high precision quality
Flowmeter 14 collects data as control centre 13 and controls well head pressure foundation, using gas flow measurement data as control centre 13
Correct overflow type and well head pressure foundation.The biphase gas and liquid flow flow is segmented the control of the underbalance well drilling plant of real-time monitoring
Center 13 is segmented real-time measurement drilling process middle outlet flow and gas output by mass flowmenter 14 and gas flowmeter 16, matches
Vertical pressure (being obtained by the measurement of standpipe pressure sensor 1), casing pressure data (being obtained by the measurement of first pressure sensor 4) are closed, water is passed through
Mechanics Calculation software and logic judgment analyze shaft bottom operating condition, and giving warning in advance overflow and carries out pressure adjustment in well head, realize good
Wellbore pressure control, to effectively solve narrow Density Window, spray leakage with the borehole problems such as depositing.
In the present embodiment, the arrival end of the first pipeline 20 and the swivel control head hydraulic operated valve 2 of wellhead blowout preventor group 103 connect
It connects, the outlet end of the first pipeline 20 is connect with the arrival end of liquid-gas separator 15, the arrival end of the suction line 25 of choke manifold
It is connect with the liquid-operated flat valve 17 of wellhead blowout preventor group 103, the outlet end of the first pipeline 21 of choke manifold 102 is also divided with liquid gas
Arrival end connection from device 15, gas flowmeter 16 are connect with the gas vent of liquid-gas separator 15.The biphase gas and liquid flow flow
The underbalance well drilling plant of segmentation real-time monitoring is based on high-precision mass flowmenter 14 and gas flowmeter 16 is segmented real-time survey
Output fluid flow is measured, cooperation pressure parameter variation can simulate in real time and judge underground overflow type, issue early warning in advance.In Fig. 1
In, drilling spool W1, double ram type preventer W2, single ram type perventer W3, annular preventer are contained in wellhead blowout preventor group 103
W4, swivel control head W5, swivel control head hydraulic operated valve 2 are connect with swivel control head W5, liquid-operated flat valve 17 and drilling spool W1
Connection.
In the present embodiment, on the first pipeline 20, is provided between first pressure sensor 4 and the throttle valve 5 that surges
One manual flat valve 6 surges and is provided with the first ball valve 9, mass flowmenter 14 and first between throttle valve 5 and mass flowmenter 14
The second ball valve 10 and second pressure sensor 11 are disposed between the outlet end of pipeline 20.Second pressure sensor 11 and
The second manual flat valve 12, the first ball valve 9, mass flowmenter 14 and the second ball valve 10 are provided between the outlet end of one pipeline 20
It is parallel with third manual flat valve 8.Choke manifold 102 also contains the second pipeline 22, third pipeline 23 and four-way 19, suction line
25 are connect by four-way 19 with the first pipeline 21, the second pipeline 22 and third pipeline 23 in parallel, as shown in Figure 1, preferred valve 7
For manual flat valve.
Under balance pressure drilling system 101 and choke manifold 102 are connect simultaneously on the swivel control head hydraulic operated valve 2 of the outlet RCD, are owed
The system of balanced drilling system 101 is used as second outlet as first outlet, choke manifold 102, opens first manual flap type 6 and uses
Under balance pressure drilling system, Open valve 7 are transferred to choke manifold 102.Installation first pressure sensing before first outlet and second outlet
Device 4 is measured for well head pressure, the pressure after high-precision mass flowmenter 14 after the measurement throttling of installation second pressure sensor 11
Power can guarantee with quality of protection flowmeter 14 and liquid-gas separator 15, flowmeter lower section the first ball valve 9 of installation and the second ball valve 10
Maintenance is isolated between 14 age at failure of mass flowmenter.During normal drilling, at the third manual flat valve 8 of 14 lower section of mass flowmenter
In normally off, 14 maintenance period of mass flowmenter, third manual flat valve 8 is opened.Control centre 13 passes through logic judgment list
Member and hydraulic analogy computing unit calculate target pressure value and flow value, to adjust the aperture for the throttle valve 5 that surges to adjust
Well head pressure.Specifically, the overflow type that control centre 13 analyzes according to hydraulic analogy, cooperates logic judgment unit, mesh is selected
The constant drilling model of the vertical pressure of mark, the constant drilling model of target flow, big flow variation drilling model etc..I.e. according to hydraulic analogy point
Analyse the permissible pressure fluctuation range value P of setting2, allow flowed fluctuation difference Q2, the aperture of the throttle valve 5 that surges can be automatically adjusted, from
And adjust well head pressure.
The underbalance well drilling plant adjustment well head pressure using biphase gas and liquid flow flow segmentation real-time monitoring is described below
Method, i.e., a kind of under balance pressure drilling method of biphase gas and liquid flow flow monitoring, owing for the biphase gas and liquid flow flow monitoring be flat
Weighing apparatus boring method includes the following steps：
Step 1, control centre 13 acquisition monitoring in real time standpipe pressure sensor 1, first pressure sensor 4, mass flow
The signal data that meter 14 and gas flowmeter 16 issue, valve 7 are in normally off；
The signal data is generated the change curve of data value and time relationship by step 2, control centre 13 correspondingly
(as included the change curve of vertical pressure and time relationship, the change curve of casing pressure and time relationship, outlet total flow and time relationship
Change curve and capacity and time relationship change curve, the time is abscissa in above-mentioned four change curves), root
During judging difference locating for drillng operation according to the change curve, the specific period control centre 13 according to locating for the drillng operation
The aperture for the throttle valve 5 that surges is controlled by signal transceiver 3, as shown in Figure 1.
Generally, during under balance pressure drilling is likely to occur four differences, during respectively normal drilling, during gas cut, oil
It is in no particular order coordination during four differences during water enchroachment (invasion) and during huge discharge.
In step 2, when control centre 13 detects that the numerical value (ordinate) of every change curve is normally being crept into
When being worth in range, then during drillng operation is in normal drilling, the aperture by controlling the throttle valve 5 that surges makes well head pressure just
In normal range.During i.e. normal drilling (when underground has no unusual service condition), drilling fluid returns out through swivel control head hydraulic operated valve 2,
The valve 7 for being connected to choke manifold 102 is in normally off, and drilling fluid enters under balance pressure drilling system 101, successively through the first pressure
Force snesor 4, first manual flap type 6, the throttle valve 5 that surges, the first ball valve 9, mass flowmenter 14, the second ball valve 10, second
Enter liquid-gas separator 15 after pressure sensor 11 and the second manual flat valve 12, drilling fluid returns to vibrating screen, and outlet is returned on stratum
Body is lighted a fire after gas flowmeter 16.Each pressure and flow are transmitted to after hydraulic control platform 3 uniform transmission to control centre 13.According to
U-tube principle, in normal drilling, there are following relationships：Psp+PZj-Pzf=PWBP+PHj-PHf, wherein：PspIt is single for standpipe pressure
Position is MPa；PZjFor liquid column hydrostatic pressure in drill string, unit MPa；PzfFor frictional resistance in drill string, unit MPa；PHjFor annular space hydrostatic
Column pressure, unit MPa；PWBPFor wellhead back pressure, unit MPa；PHfFor annular space frictional resistance, unit MPa.According to the principle, just
During Chang Zuoye, the control centre 13 of under balance pressure drilling system 101 is according to vertical pressure, the real-time monitoring and water of casing pressure and rate of discharge
Mechanical simulation obtains relevant parameter under the operating condition, after calculating, judges underground working, and issues instruction to hydraulic control platform 3.It is logical
It overregulates the automatic throttle 5 that surges and back pressure is applied to well head, shaft bottom annular pressure is maintained to creep within the allowable range.
Alternatively, in step 2, when control centre 13 detects the change curve corresponding with standpipe pressure sensor 1
Numerical value reduce, and when the numerical value of the change curve corresponding with mass flowmenter 14 remains unchanged, then drillng operation is in
During gas cut, include the following steps during the gas cut：
Step 2.1a, control centre 13 calculate target stand pressure value, target flow value, permission pressure-difference fluctuation value range；
Step 2.2a, work as P1-Psp<P2, control centre 13, which issues, increases by the instruction of 5 aperture of throttle valve of surging；Work as Psp-P1
>P2When, control centre 13, which issues, reduces 5 opening degree instruction of throttle valve that surges；Wherein, P1Pressure value, unit MPa are found for target；P2For
Permissible pressure fluctuation range value, unit MPa；PspFor standpipe pressure, unit MPa；
Step 2.3a, after one section of lagged time (such as 3 to 20 seconds, such as 5 seconds, 10 seconds, 15 seconds), work as Q1>When Q, control
Center 13 issues the instruction for increasing by 5 aperture of throttle valve of surging；Work as Q1<When Q, the sending of control centre 13 reduces the throttle valve 5 that surges and opens
Degree instruction；Wherein, Q1For target flow value, unit kg/s；Q is actual flow value, unit kg/s.May then return to
Step 1 continues real-time monitoring.
(just occur formation gas i.e. during gas cut and entered pit shaft, pressure is in controlled range), valve 7, which is in, closes shape
State, drilling fluid flow through under balance pressure drilling system 101.The acquisition of control centre 13 and monitoring standpipe pressure sensor 1 and mass flow
The measurement data of meter 14 simultaneously generates the change curve, and logic judgment unit is low by the vertical pressure drop of analysis, the constant judgement of rate of discharge Q
For gas cut.It is P that hydraulic analogy computing unit, which goes out target to found pressure value,1, target flow value Q1, permissible pressure fluctuation range value P2, when
P1-Psp<P2, control centre 13, which issues to increase, surges 5 opening degree instruction of throttle valve (according to discharge capacity and throttle valve in hydraulics software
Aperture and the simulation curve of well head pressure variation, calculate target throttle aperture at this time, while being counted by hydraulics software
According to amendment, aperture data are sent to hydraulic control platform, adjust throttle valve opening then to reduce well head pressure), work as Psp-P1>P2
When, control centre 13, which issues to reduce, surges 5 opening degree instruction of throttle valve to increase well head pressure.After a lagged time, if Q1>
When Q, 16 curve of gas flowmeter goes up, i.e. gas migration to well head, executes P1-Psp<P2Step；Q1<When Q, P is executedsp-P1>P2
Step.
Alternatively, in step 2, when control centre 13 detects the change curve corresponding with standpipe pressure sensor 1
Numerical value reduce, and when square wave (as shown in Figure 3) occurs in the change curve corresponding with mass flowmenter 14, at drillng operation
During grease is invaded, include the following steps during the grease is invaded：
Step 2.1b, the permission of target flow value, permission during control centre 13 calculates the vertical pressure value of target, grease is invaded
Flowed fluctuation range difference；
Step 2.2b, work as Q1-Q<Q2When, control centre 13 issues the instruction for increasing by 5 aperture of throttle valve of surging；Work as Q1-Q>
Q2When, control centre 13, which issues, reduces 5 opening degree instruction of throttle valve that surges；Wherein, Q1Target flow value during being invaded for mesh grease,
Unit is kg/s；Q2To allow flowed fluctuation range difference, unit kg/s；Q is actual flow value, unit kg/s；
Step 2.3b, after one section of lagged time (such as 3 to 20 seconds, such as 5 seconds, 10 seconds, 15 seconds), work as P1<PsWhen, control
Center 13 issues the instruction for increasing by 5 aperture of throttle valve of surging；Work as P1>PspWhen, the sending of control centre 13 reduces the throttle valve 5 that surges and opens
Degree instruction；Wherein, P1Pressure value, unit MPa are found for target；P2For permissible pressure fluctuation range value, unit MPa；PspIt is vertical
Pipe pressure.It may then return to step 1 and continue real-time monitoring.
Valve i.e. during grease is invaded (grease just occurred and entered pit shaft, pressure is in controlled range), before choke manifold 102
Door 7 is in close state, and drilling fluid flows through under balance pressure drilling system 101, the acquisition of control centre 13 and monitoring standpipe pressure sensing
The measurement data of device 1 and mass flowmenter 14 simultaneously generates the change curve, and logic judgment unit is low by analyzing vertical pressure drop, exports
There is square wave and is judged as that grease is invaded in flow curve.It is P that hydraulic analogy system-computed, which goes out target to found pressure value,1, target flow value Q1, permit
Perhaps flowed fluctuation difference Q2, work as Q1-Q<Q2When, control centre 13, which issues to increase, surges 5 opening degree instruction of throttle valve to reduce well head
Pressure works as Q1-Q>Q2When, control centre 13, which issues to reduce, surges 5 opening degree instruction of throttle valve to increase well head pressure.Late through one
After to the time (16 curve of gas flowmeter is constant), if P1<PspWhen, execute Q1-Q<Q2Step；P1>PspWhen, execute Q1-Q>Q2
Step.
Alternatively, in step 2, when control centre 13 detects the number of the change curve corresponding with mass flowmenter 14
When being worth continuous rise, then during drillng operation is in huge discharge, include the following steps during the huge discharge：
Step 2.1b, control centre 13 calculates the target flow value during huge discharge；
Step 2.2b, work as Q3-Q<Q2When, open 102 early gate 7 of choke manifold；Work as Q3-Q>Q2, open choke manifold
102 early gates 7 close first manual flap type 6；Wherein, Q2To allow flowed fluctuation range difference, unit kg/s；Q is real
Border flow value, unit kg/s；Q3For the target flow value during huge discharge, unit kg/s.
I.e. during huge discharge, control centre 13 monitors rate of discharge curve continuous rise, hydraulic analogy computing unit
Unit calculates target flow value Q3, work as Q3-Q<Q2When, the valve 7 before opening choke manifold 102 works as Q3-Q>Q2, keep valve
The opening state of door 7 closes first manual flap type 6, carries out cycle of higher pressure throttling.
In the present embodiment, standpipe pressure Psp, it is liquid column hydrostatic pressure P in drill stringZj, frictional resistance P in drill stringzf, annular space hydrostatic column
Pressure PHj, wellhead back pressure PWBP, annular space frictional resistance PHf, target founds pressure value P1；Permissible pressure fluctuation range value P2, target founds pressure value P1,
Permissible pressure fluctuation range value P2, allow flowed fluctuation range difference Q2, target flow value Q during huge discharge3Deng can lead to
Experience acquisition is crossed, it can also be modified by practical application.
The above, only specific embodiments of the present invention cannot limit the range that invention is implemented with it, so it is equivalent
The displacement of component, or according to equivalent variations made by the invention patent protection scope and modification, should all still fall within what this patent was covered
Scope.In addition, between technical characteristic and technical characteristic in the present invention, between technical characteristic and technical solution, technical solution with
Use can be freely combined between technical solution.
Claims (3)
1. a kind of under balance pressure drilling method of biphase gas and liquid flow flow monitoring, which is characterized in that the biphase gas and liquid flow flow prison
The under balance pressure drilling method of survey uses the underbalance well drilling plant of biphase gas and liquid flow flow segmentation real-time monitoring；
The underbalance well drilling plant of the biphase gas and liquid flow flow segmentation real-time monitoring includes under balance pressure drilling system (101) and section
Flow tube remittance (102)；
Under balance pressure drilling system (101) contains the first pressure sensor (4), first-hand being sequentially connected in series on the first pipeline (20)
Dynamic flap type (6), the throttle valve that surges (5), mass flowmenter (14), under balance pressure drilling system (101) also contain control centre
(13) it is received with signal with signal transceiver (3), first pressure sensor (4), the throttle valve that surges (5) and mass flowmenter (14)
Platform (3) connection is sent out, signal transceiver (3) is connect with control centre (13)；Standpipe pressure in control centre (13) and drilling well-head
Force snesor (1) connection, control centre (13) also connect with the gas flowmeter (16) outside drilling well-head；
Choke manifold (102) contains a plurality of pipeline, and the first pipeline (20) passes through the inlet tube of connecting pipeline (24) and choke manifold
Line (25) connection, the arrival end of connecting pipeline (24) are located between first pressure sensor (4) and first manual flap type (6),
Connecting pipeline (24) is equipped with valve (7)；
The arrival end of first pipeline (20) is connect with the swivel control head hydraulic operated valve (2) of wellhead blowout preventor group (103), the first pipeline
(20) outlet end is connect with the arrival end of liquid-gas separator (15), the arrival end and well head of the suction line (25) of choke manifold
The liquid-operated flat valve (17) of preventer group (103) connects, the outlet end of the first pipeline (21) of choke manifold (102) also with liquid gas
The arrival end of separator (15) connects, and gas flowmeter (16) is connect with the gas vent of liquid-gas separator (15)；
On the first pipeline (20), first manual flap type is provided between first pressure sensor (4) and the throttle valve that surges (5)
(6), it surges and is provided between throttle valve (5) and mass flowmenter (14) the first ball valve (9), mass flowmenter (14) and the first pipe
The second ball valve (10) and second pressure sensor (11) are disposed between the outlet end of line (20)；
It is provided between second pressure sensor (11) and the outlet end of the first pipeline (20) the second manual flat valve (12), first
Ball valve (9), mass flowmenter (14) and the second ball valve (10) are parallel with third manual flat valve (8)；
For choke manifold (102) also containing the second pipeline (22), third pipeline (23) and four-way (19), suction line (25) passes through four
Logical (19) are connect with the first pipeline (21), the second pipeline (22) and third pipeline (23) in parallel；
The under balance pressure drilling method of the biphase gas and liquid flow flow monitoring includes the following steps：
Step 1, control centre (13) real-time monitoring standpipe pressure sensor (1), first pressure sensor (4), mass flowmenter
(14) and the signal data of gas flowmeter (16) sending, valve (7) are in normally off；
The signal data is generated the change curve of data value and time relationship, root by step 2, control centre (13) correspondingly
During judging difference locating for drillng operation according to the change curve, the specific period control centre according to locating for the drillng operation
(13) aperture for throttle valve (5) of surging is controlled by signal transceiver (3)；
In step 2, when the numerical value of every change curve is within the scope of normal drilling values, drillng operation is in normal and bores
Into period, the aperture by controlling the throttle valve (5) that surges makes well head pressure in normal range；
In step 2, when the numerical value of the change curve corresponding with standpipe pressure sensor (1) reduces, and and mass flow
When the numerical value of the corresponding change curve of meter (14) remains unchanged, during drillng operation is in gas cut, wrapped during the gas cut
Include following steps：
Step 2.1a, control centre (13) calculate target stand pressure value, target flow value, permission pressure-difference fluctuation value range；
Step 2.2a, work as P1-Psp<P2, control centre (13), which issues, increases the instruction of throttle valve (5) aperture of surging；Work as Psp-P1>
P2When, control centre (13), which issues, reduces throttle valve (5) opening degree instruction that surges；
P1Pressure value, unit MPa are found for target；P2For permissible pressure fluctuation range value, unit MPa；PspIt is single for standpipe pressure
Position is MPa；
Step 2.3a, after one section of lagged time, work as Q1>When Q, control centre (13), which issues, increases throttle valve (5) aperture of surging
Instruction；Work as Q1<When Q, control centre (13), which issues, reduces throttle valve (5) opening degree instruction that surges；
Q1For target flow value, unit kg/s；Q is actual flow value, unit kg/s.
2. the under balance pressure drilling method of biphase gas and liquid flow flow monitoring according to claim 1, which is characterized in that in step
In 2, when the numerical value reduction of the change curve corresponding with standpipe pressure sensor (1), and relatively with mass flowmenter (14)
When square wave occurs in the change curve answered, drillng operation is in grease and invades period, includes the following steps during the grease is invaded：
Step 2.1b, control centre (13) calculate target found target flow value during pressure value, grease are invaded, allow allow to flow
Measure fluctuation range difference；
Step 2.2b, work as Q1-Q<Q2When, control centre (13) issues the instruction for increasing throttle valve (5) aperture of surging；Work as Q1-Q>
Q2When, control centre (13), which issues, reduces throttle valve (5) opening degree instruction that surges；
Q1For target flow value, unit kg/s；Q2To allow flowed fluctuation range difference, unit kg/s；Q is actual flow
Value, unit kg/s；
Step 2.3b, after one section of lagged time, work as P1<PsWhen, control centre (13) sending increases the throttle valve (5) that surges and opens
The instruction of degree；Work as P1>PspWhen, control centre (13), which issues, reduces throttle valve (5) opening degree instruction that surges；
P1Pressure value, unit MPa are found for target；P2For permissible pressure fluctuation range value, unit MPa；PspFor standpipe pressure.
3. the under balance pressure drilling method of biphase gas and liquid flow flow monitoring according to claim 2, which is characterized in that in step
In 2, when the numerical value continuous rise of the change curve corresponding with mass flowmenter (14), drillng operation is in the huge discharge phase
Between, include the following steps during the huge discharge：
Step 2.1b, the target flow value during control centre (13) calculates huge discharge；
Step 2.2b, work as Q3-Q<Q2When, open choke manifold (102) early gate (7)；Work as Q3-Q>Q2, open choke manifold
(102) early gate (7) are closed first manual flap type (6)；
Q2To allow flowed fluctuation range difference, unit kg/s；Q is actual flow value, unit kg/s；Q3For the huge discharge phase
Between target flow value, unit kg/s.
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| CN108571319B (en) * | 2018-03-07 | 2021-09-28 | 西南石油大学 | Differential pressure type gas invasion and displacement type gas invasion judgment method and device |
| CN108729868B (en) * | 2018-05-25 | 2020-07-14 | 中国海洋石油集团有限公司 | Deep sea drilling overflow and lost circulation monitoring method |
| CN115263210B (en) * | 2022-07-25 | 2023-09-26 | 中国石油大学(华东) | Spiral-flow type separation pressure-stabilizing intelligent throttling device and working method thereof |
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