CN103032064A - Method and device for detecting gas cut position in drilling process - Google Patents
Method and device for detecting gas cut position in drilling process Download PDFInfo
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- CN103032064A CN103032064A CN2013100104877A CN201310010487A CN103032064A CN 103032064 A CN103032064 A CN 103032064A CN 2013100104877 A CN2013100104877 A CN 2013100104877A CN 201310010487 A CN201310010487 A CN 201310010487A CN 103032064 A CN103032064 A CN 103032064A
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Abstract
The invention provides a method and a device for determining a gas cut position in the drilling process based on pressure wave time difference. The method comprises the following steps: enabling the device to take a pressure wave generated by the action of a hydraulic throttle valve as a wave source and judging whether the gas cut occurs or not by detecting the time difference between pressure waves received by a stand pipe pressure sensor and a sleeve pressure sensor; and according to the detected wellhead gas and liquid flow rate, the detected casing pressure and the detected transmission time difference between the pressure waves in an annulus and a drill rod, carrying out Runge-kutta iteration on all parameters by adopting an annulus hydraulic model, obtaining a corresponding relation existing among the distribution of void rates in different grids in the annulus, the wave velocity response time, the gas cut position and the pressure wave response time, determining an accurate position where the gas cut occurs. Compared with a traditional gas cut detection method, the method and the device provided by the invention have the beneficial effects that not only is the conventional gas cut detection function realized, but also the gas cut position can be accurately and quickly determined; and the method and the device have the advantages of accuracy in detection, strong real time, low equipment cost, simplicity in operation, wide application scope and the like.
Description
Technical field
The present invention relates to a kind of logging method and device, refer to especially a kind of method and device that in oil, gas drilling process, detects the gas cut position, belong to the logging technique field.
Background technology
In the drilling process, lower brill generation surge pressure, drilling fluid density is excessively low, strata pressure is unusual etc. all can cause strata pressure greater than annular pressure, causes formation gas to invade the shaft bottom, and gas cut occurs.Under any operating mode, when gas cut occurs, there is Negative Pressure Difference in annular space with the ground interlayer, if in time do not detect gas cut and adopt an effective measure, along with the migration of gas to well head, then can cause annular space and the Negative Pressure Difference of ground interlayer further to increase, make the gas cut aggravation, further worsen, bring out easily the accidents such as blowout.Under the regular situation, gas cut occurs in shaft bottom or casing shoe place, but bores when meeting the complex stratum, and gas cut may occur in any position of Open-Hole Section.Consider that from the drilling safety angle it is more early better that gas cut is found, accurately judges the gas cut position, more is conducive to take effective measures the supression gas cut, fundamentally stops the generation of gas blowout accident, the assurance drilling well is normally carried out.
At present, situ of drilling well has multiple gas cut determination methods, rushes method etc. such as drilling fluid pot level detection method, dc index method, shale density method, torquemeter detection method, sonic time difference, pump.Tool is typically sonic time difference and pump rushes method.Wherein, the basic principle of sonic time difference is, the spread speed of sound wave in drilling fluid with gas is different from spread speed in drilling fluid with gas not, when gas cut does not occur, sound wave spread speed in the drilling fluid in drilling rod equates with spread speed in the drilling fluid in annular space, when gas cut occurs, drilling fluid in the annular space contains gas, the drilling fluid with gas of the sound wave that send in the shaft bottom in annular space passes to the required time of ground and the not drilling fluid with gas in drilling rod passes to the required asynchronism(-nization) in ground, judges the down-hole according to large I of this time difference whether gas cut has occured.The basic principle that pump rushes method is, when the drilling mud pump work, the pump inner carrier produces pressure pulse, this pressure pulse enters the circulating system, in drill string, mud motor, measuring while drilling system, bit nozzle, propagate, then along returning on the annular space to ground, the method is the pressure pulse that utilizes slush pump to produce when work, as the ground pressure impulse generator.
Yet the gas cut that the gas incursion check of domestic and international drilling well industry is confined to is judged, there is no the method that can fast, accurately judge gas cut position in the drilling process, can't satisfy the requirement of the accurate controlled pressure drilling of micrometeor.Judge that accurately the gas cut position not only helps the earth formation of Analysis of Complex, and can take effective measures for the gas cut particular location, restrain gas cut as increasing the methods such as drilling fluid density, increasing back pressure or casing off.How accurately to judge the gas cut position, become a difficult problem that needs to be resolved hurrily in the present drilling engineering.Therefore, be necessary very much to provide a kind of method and apparatus that fast, accurately detects the gas cut position.
Summary of the invention
The purpose of this invention is to provide the method and the device that detect the gas cut position in a kind of drilling process, the method and device are based on the function of compression wave time difference realization gas cut judgement and gas cut position probing.
The basic principle of a kind of compression wave gas cut method for detecting position provided by the invention is: judge gas cut and detect the gas cut position based on the spread speed of compression wave in the drilling fluid of different void fractions is different; The choke valve that surges action produces compression wave, and compression wave is propagated to the shaft bottom along annular space, arrives behind the shaft bottom respectively in drilling rod that mud returns ground in mud, the annular space; The time difference that receives the compression wave that the shaft bottom is reflected back according to standpipe pressure sensor and casing pressure sensor judges whether to occur gas cut; According to the well head gas flow quantity that detects, casing pressure, the compression wave propagation time difference in annular space and drilling rod, adopt the annular hydraulics model that each parameter is carried out Runge-Kutta iteration, draw distribution and the velocity of wave response time of diverse location void content in the annular space, determine the one-to-one relationship that gas cut position and compression wave existed between the response time, thereby obtain occuring the accurate location of gas cut.
A kind of compression wave gas cut position detecting device provided by the invention comprises casing pressure sensor, standpipe pressure sensor, gas-liquid flow meter, the choke valve that surges, Industrial Personal Computer (IPC) and data command transmission line; Described standpipe pressure installation of sensors is in the drilling fluid entrance, described casing pressure installation of sensors is in drilling fluid annular space exit, described casing pressure sensor and standpipe pressure sensor can detect casing pressure and standpipe pressure in real time, and pick up the time that receives compression wave; Connect successively on the pipeline behind the described casing pressure sensor gas-liquid flow meter and the choke valve that surges; Described gas-liquid flow meter can detect gas flow and the fluid flow in well head annular space exit in real time; The described choke valve that surges is realized mutual by described data command transmission line and described Industrial Personal Computer (IPC), the described choke valve that surges can by the data command transmission line to Industrial Personal Computer (IPC) transmission choke valve actuation time, receive and also carry out the throttle valve opening regulating command that Industrial Personal Computer (IPC) sends; Described data command transmission line has four, described casing pressure sensor, standpipe pressure sensor, gas-liquid flow meter, the choke valve that surges are connected with described Industrial Personal Computer (IPC) by four data command lines, to described Industrial Personal Computer (IPC) conveying gas flow quantity, casing pressure, the vertical choke valve actuation time of pressing, surge, casing pressure sensor receive the time of compression wave, the time that the standpipe pressure sensor receives compression wave, and the data transmission of realization and instruction send; Be provided with altogether 4 data transmission channels on the described Industrial Personal Computer (IPC), link to each other with the four instructions transmission line respectively; The choke valve actuation time of surging, casing pressure sensor that described Industrial Personal Computer (IPC) can receive the transmission of described data command transmission line in real time receive the time of compression wave, time, standpipe pressure, casing pressure, gas flow, the fluid flow data that the standpipe pressure sensor receives compression wave; Described Industrial Personal Computer (IPC) has human-computer interaction interface, underlying parameter and the drilling fluid properties that can make hole Industrial Personal Computer (IPC) input, and can show the data that detect, whether gas cut occurs and the position of gas cut occurs; Built-in gas cut position probing software in the described Industrial Personal Computer (IPC) by each parameter is calculated, determines to occur the accurate location of gas cut.
A kind of compression wave gas cut position detecting device provided by the invention is to reach the purpose that gas cut is judged, adopts following technical method: if when described gas-liquid flow meter does not detect gas, then detect the shaft bottom whether gas cut occurs, realize conventional gas incursion check function.Described Industrial Personal Computer (IPC) sends the instruction of controlling opening of valve, is transferred to the described choke valve that surges by described data command line, and the described choke valve place of surging produces compression wave.If described standpipe pressure sensor and described casing pressure sensor receive the compression wave that launch back in the shaft bottom simultaneously, being the propagation time of compression wave in drilling rod equated with propagation time in annular space, show then gas cut does not occur that described Industrial Personal Computer (IPC) shows " gas cut does not occur ".If described standpipe pressure sensor receives first compression wave, receive compression wave behind the described casing pressure sensor, be that the propagation time of compression wave in drilling rod is less than the propagation time in the annular space, then show the generation gas cut, described Industrial Personal Computer (IPC) shows " gas cut has occured " and sends instruction, reduce the aperture of the described choke valve that surges, increase the annular space casing pressure and suppress gas cut, until the propagation time of compression wave in drilling rod equated with propagation time in annular space.
A kind of compression wave gas cut position detecting device provided by the invention is the purpose that reaches the gas cut position probing, adopts following technical method: if described gas-liquid flow meter detects gas, then detect the gas cut position.Described Industrial Personal Computer (IPC) sends the instruction that reduces aperture to the choke valve that surges, and the aperture of described choke valve reduces rapidly to suppress gas cut, and the choke valve that surges produces compression wave.Receive time of compression wave according to two pressure sensors, the compression wave of determining to return from the shaft bottom is in drilling rod and airborne time difference of ring.Built-in gas cut position probing software in the described Industrial Personal Computer (IPC), according to the annular hydraulics model each parameter is calculated, determine to occur the accurate location of gas cut, show the gas cut position at Industrial Personal Computer (IPC), and send next step throttle valve adjustment instruction by the data command transmission line to the choke valve that surges according to result of calculation.
The present invention has the following advantages owing to take above technical scheme.
(1) conventional gas incursion check method detects accurately: though can judge whether gas cut occurs, but can't detect exactly the gas cut position, the present invention is based on the compression wave time difference method, not only realized the function of conventional gas incursion check, and can accurately determine the gas cut position, remedied the defective that the gas cut position appears judging in existing apparatus, but the Effective Raise operating efficiency.
(2) instantaneity is strong: the gentle flow quantity meter of apparatus of the present invention adopts pressure sensor detects the variation of import export position pressure and flow in real time, not only improved the gas incursion check precision, and realized the Real Time Monitoring of drilling process, Effective Raise the sensitivity that detects.
(3) equipment cost is low: apparatus of the present invention do not need the well site is improved on a large scale, with the choke valve that surges of well head as fluctuation sources, the gentle flow quantity meter of adopts pressure sensor detects well head pressure and flow, data line detects data and is sent to Industrial Personal Computer (IPC) each, by Industrial Personal Computer (IPC) each parameter is carried out annular hydraulics and calculate, can realize the detection of gas cut position.
(4) simple to operate: only need open Industrial Personal Computer (IPC), connect each data command line, the input relevant parameter, the Output rusults of observing on the Industrial Personal Computer (IPC) screen can be finished gas incursion check and gas cut location positioning.
(5) applied range: method provided by the invention and device are the detections that can be widely used in gas cut position in the drilling process such as under balance pressure drilling, controlled pressure drilling, micrometeor drilling well.
Description of drawings
Fig. 1 is the structural representation of gas cut position detecting device of the present invention.
Fig. 2 is Industrial Personal Computer (IPC) 5 built-in gas cut position probing software computing block diagrams of the present invention.
Fig. 3 is oilwell parameter and the drilling fluid properties of the embodiment of the invention;
Fig. 4 is data and the testing result that the Industrial Personal Computer (IPC) of the embodiment of the invention receives.
Each mark is as follows among the figure: 1 casing pressure sensor; 2 standpipe pressure sensors; 3 gas-liquid flow meters; 4 choke valves that surge; 5 Industrial Personal Computer (IPC)s; 6 data command transmission lines; 7 annular spaces; 8 drilling rods.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing, but the present invention is not limited to following examples.
The structural representation of gas cut position detecting device of the present invention as shown in Figure 1, Industrial Personal Computer (IPC) 5 built-in gas cut position probing software computing block diagrams are as shown in Figure 2.Apparatus of the present invention can be transformed by the waterpower pressure measuring system to drilling process, and realize in conjunction with annular hydraulics is theoretical.
Compression wave gas cut position detecting device of the present invention comprises casing pressure sensor 1, standpipe pressure sensor 2, casing pressure sensor 1, standpipe pressure sensor 2, gas-liquid flow meter 3, the choke valve 4 that surges, Industrial Personal Computer (IPC) 5 and data command transmission line 6; Standpipe pressure sensor 2 is installed in the drilling fluid entrance, and casing pressure sensor 1 is installed in drilling fluid annular space exit, and casing pressure sensor 1 and standpipe pressure sensor 2 detect casing pressure and standpipe pressure in real time, and pick up the time that receives compression wave; Connect successively on the pipeline behind the casing pressure sensor 1 gas-liquid flow meter 3 and the choke valve 4 that surges; Gas-liquid flow meter 3 detects gas flow and the fluid flow in well head annular space exit in real time; The choke valve 4 of surging is realized mutual by data command line 6 and described Industrial Personal Computer (IPC) 5, the choke valve 4 that surges can by data command transmission line 6 to 4 actuation times of Industrial Personal Computer (IPC) 5 transmission choke valves, receive and also carry out the throttle valve opening regulating command that Industrial Personal Computer (IPC) 5 sends; Data command transmission line 6 has four, casing pressure sensor 1, standpipe pressure sensor 2, gas-liquid flow meter 3, the choke valve 4 that surges are connected with Industrial Personal Computer (IPC) 5 by four data command lines, to Industrial Personal Computer (IPC) 5 conveying gas flow quantities, casing pressure, the vertical choke valve actuation time of pressing, surge, casing pressure sensor receive the time of compression wave, the time that the standpipe pressure sensor receives compression wave, and the data transmission of realization and instruction send; Be provided with altogether 4 data transmission channels on the Industrial Personal Computer (IPC) 5, link to each other with four instructions transmission line 6 respectively; Industrial Personal Computer (IPC) 5 receives in real time that described data command transmission line 6 transmits surges and 4 actuation times of choke valve, casing pressure sensor 1 receives the time of compression wave, time, standpipe pressure, casing pressure, gas flow, the fluid flow data that standpipe pressure sensor 2 receives compression wave; Industrial Personal Computer (IPC) 5 has human-computer interaction interface, can input underlying parameter and the drilling fluid properties that makes hole at Industrial Personal Computer (IPC) 5, and can show the data that detect, the position whether gas cut and generation gas cut occur; Built-in gas cut position probing software in the Industrial Personal Computer (IPC) 5, by computing block diagram shown in Figure 2, adopt runge kutta method, according to the annular hydraulics model each parameter is calculated, determine to occur the accurate location of gas cut, show at Industrial Personal Computer (IPC) 5, and send next step throttle valve adjustment instruction by the data command transmission line to the choke valve 4 that surges according to result of calculation.
Shown in the built-in gas cut position probing of the Industrial Personal Computer (IPC) as shown in Figure 2 software computing block diagram, its concrete computational process is: in underlying parameter and drilling fluid properties that Industrial Personal Computer (IPC) 5 inputs make hole, the built-in gas cut position probing software of Industrial Personal Computer (IPC) 5 is separated into annular space when finding the solution
nIndividual grid, the well head place is first grid (well depth
H 0=0m, void content is
φ 0, casing pressure is
P 0, velocity of wave is
c 0), but according to the well head parameter with next mesh parameter of runge kutta method iterative computation (
φ 1,
P 1,
H 1,
c 1), try to achieve successively
iThe parameter of individual grid (
φ i ,
P i ,
H i ,
c i ), according to
iThe parameter of individual grid can calculate the time that corresponding grid internal pressure ripple is propagated.Compression wave in annular space before
i(
i≤
n) propagation time sum in the individual grid
T 1, as the formula (1), the compression wave in the drilling rod 8 is in the annular space the
iThe well depth that individual grid is corresponding propagates into the required time of well head and is
T 2, as the formula (2), the compression wave time difference is △
T, as the formula (3).
Calculate gas cut position and compression wave time difference △ by Industrial Personal Computer (IPC) 5 built-in gas cut position probing softwares
TBetween corresponding relation, two pressure sensors that calculate by formula (4) detect the time difference that compression wave is propagated in casing annulus 7 and drill string 8
T c The velocity of wave time difference △ that goes out with iterative computation
TBetween difference, if satisfy precision in the formula (4)
δRequirement then finishes computing, and this up-to-date style (5) is tried to achieve
HBe the length of the above well section in annular space gas cut position.Otherwise,
i=
i + 1, enter next grid, repeat above-mentioned steps to satisfying required precision.Described formula (1) is as follows to (5),
T
1=∑(H
i/c
i)，i≤n （1）
T
2=∑(H
i/c),i≤n （2）
△T=T
1-T
2 （3）
｜T
c-( T
1-T
2)｜<δ （4）
H=∑(H
i) ,i≤n （5）
In the formula
T 1---the time of the pressure-wave emission returned along annular space, s;
T 2---the time of the pressure-wave emission returned along drill string, s;
H i ---the
iThe height of individual grid, m;
c i ---compression wave is
iSpread speed in the individual grid, m/s;
c---the spread speed of compression wave in gas-free single-phase drilling fluid, m/s;
△
T---the compression wave that calculates returns the time difference, s;
T c ---the compression wave that pressure sensor detects returns the time difference, s;
δ---gas cut position calculation precision, m;
H---the above well segment length in gas cut position, m.
The concrete grammar that gas cut of the present invention is judged is: if when described gas-liquid flow meter 3 does not detect gas, then detect the shaft bottom whether gas cut occurs, realize conventional gas incursion check function.Industrial Personal Computer (IPC) 5 sends the instruction of controlling opening of valve, is transferred to the choke valve 4 that surges by data command transmission line 6, and choke valve 4 places of surging produce compression wave, and be the compression wave time of origin actuation time of the choke valve 4 that surges.If described standpipe pressure sensor 2 receives the compression wave that launch back in the shaft bottom simultaneously with described casing pressure sensor 1, being the propagation time of compression wave in drilling rod 8 equated with propagation time in annular space 7, show then gas cut does not occur that at this moment, described Industrial Personal Computer (IPC) 5 shows " gas cut does not occur ".If described standpipe pressure sensor 2 receives first compression wave, receive compression wave behind the described casing pressure sensor 1, be that the propagation time of compression wave in drilling rod 8 is less than the propagation time in the annular space 7, then show the generation gas cut, at this moment, described Industrial Personal Computer (IPC) shows " gas cut has occured " and sends instruction, reduces the aperture of the described choke valve 4 that surges, increase the annular space casing pressure and suppress gas cut, until the propagation time of compression wave in drilling rod 8 equated with propagation time in annular space 7.
The concrete grammar of gas cut position probing of the present invention is: if described gas-liquid flow meter 3 detects gas, then detect the gas cut position.Described Industrial Personal Computer (IPC) 5 sends the instruction that reduces aperture to the choke valve 4 that surges, and the aperture of described choke valve 4 reduces rapidly to suppress gas cut, and the choke valve 4 that surges produces compression wave.Receive time of compression wave according to two pressure sensors, the time difference that the compression wave of determining to return from the shaft bottom is propagated drilling rod 8 and annular space 7.Built-in gas cut position probing software in the described Industrial Personal Computer (IPC) 5, according to the annular hydraulics model each parameter is calculated, determine to occur the accurate location of gas cut, show the gas cut position at Industrial Personal Computer (IPC) 5, and send next step throttle valve adjustment instruction by data command transmission line 6 to the choke valve 4 that surges according to result of calculation.
According to above concrete grammar, the underlying parameter that present embodiment makes hole in Industrial Personal Computer (IPC) 5 input and drilling fluid properties as shown in Figure 3, the data that Industrial Personal Computer (IPC) 5 receives among the embodiment and testing result are as shown in Figure 4.
Each equipment of the present invention can be determined according to the job site operating mode model and the range of concrete equipment, and the range of gas-liquid flow meter 3 determines that according to mud flow rate and gas cut degree the range of the choke valve 4 that surges can be determined according to the size of controlled back pressure in the drilling process.
Claims (4)
1. a drilling process gas cut method for detecting position is characterized in that: judge gas cut and detect the gas cut position based on the spread speed of compression wave in the drilling fluid of different void fractions is different; The choke valve (4) that surges action produces compression wave, and compression wave is propagated along annular space (7) to the shaft bottom, behind the arrival shaft bottom respectively in drilling rod (8) in mud, the annular space (7) mud return ground; The time difference that receives the compression wave that the shaft bottom is reflected back according to standpipe pressure sensor (2) and casing pressure sensor (1) judges whether to occur gas cut; According to the well head gas flow quantity that detects, casing pressure, the propagation time difference of compression wave in annular space (7) and drilling rod (8), adopt the annular hydraulics model that each parameter is carried out Runge-Kutta iteration, draw distribution and the velocity of wave response time of diverse location void content in the annular space, determine the one-to-one relationship that gas cut position and compression wave existed between the response time, thereby obtain occuring the accurate location of gas cut.
2. a drilling process gas cut position detecting device is characterized in that: comprise casing pressure sensor (1), standpipe pressure sensor (2), gas-liquid flow meter (3), the choke valve that surges (4), Industrial Personal Computer (IPC) (5) and data command transmission line (6); Described standpipe pressure sensor (2) is installed in the drilling fluid entrance, described casing pressure sensor (1) is installed in drilling fluid annular space exit, described casing pressure sensor (1) and standpipe pressure sensor (2) can detect casing pressure and standpipe pressure in real time, and pick up the time that receives compression wave; Connect successively on the pipeline behind the described casing pressure sensor (1) gas-liquid flow meter (3) and the choke valve that surges (4); Described gas-liquid flow meter (3) can detect gas flow and the fluid flow in well head annular space exit in real time; The described choke valve that surges (4) is realized mutual by described data command transmission line and described Industrial Personal Computer (IPC), the described choke valve that surges (4) can by data command transmission line (6) to Industrial Personal Computer (IPC) (5) transmission choke valve (4) actuation time, receive and also carry out the throttle valve opening regulating command that Industrial Personal Computer (IPC) (5) sends; Described data command transmission line (6) has four, described casing pressure sensor (1), standpipe pressure sensor (2), gas-liquid flow meter (3), the choke valve that surges (4) are connected with described Industrial Personal Computer (IPC) (5) by four data command lines (6), to described Industrial Personal Computer (IPC) conveying gas flow quantity, casing pressure, vertical press, the choke valve that surges (4) actuation time, casing pressure sensor (1) receive the time of compression wave, the time that standpipe pressure sensor (2) receives compression wave, the data transmission of realization and instruction send; Be provided with altogether 4 data transmission channels on the described Industrial Personal Computer (IPC) (5), link to each other with four instructions transmission line (6) respectively; Described Industrial Personal Computer (IPC) (5) can receive the choke valve that surges (4) actuation time of described data command transmission line (6) transmission, the time that casing pressure sensor (1) receives compression wave, time, standpipe pressure, casing pressure, gas flow, the fluid flow data that standpipe pressure sensor (2) receives compression wave in real time; Described Industrial Personal Computer (IPC) (5) has human-computer interaction interface, underlying parameter and the drilling fluid properties that can make hole in Industrial Personal Computer (IPC) (5) input, and can show the data that detect, whether gas cut occurs and the position of gas cut occurs; Built-in gas cut position probing software in the described Industrial Personal Computer (IPC) (5) by each parameter is calculated, determines to occur the accurate location of gas cut.
3. drilling process gas cut position detecting device according to claim 2, it is characterized in that, described gas cut position detecting device realizes that the concrete grammar of gas cut position probing is: the instruction that described Industrial Personal Computer (IPC) (5) sends controlling opening of valve, be transferred to the described choke valve that surges (4) by described data command line (6), the described choke valve that surges (4) locates to produce compression wave; If described standpipe pressure sensor (2) receives the compression wave that launch back in the shaft bottom simultaneously with described casing pressure sensor (1), show then gas cut does not occur that described Industrial Personal Computer (IPC) shows " gas cut does not occur "; If described standpipe pressure sensor (1) receives first compression wave, receive compression wave behind the described casing pressure sensor (2), then show the generation gas cut, described Industrial Personal Computer (IPC) shows " gas cut has occured " and sends instruction, reduce the aperture of the described choke valve that surges, increase the annular space casing pressure and suppress gas cut, until standpipe pressure sensor (2) receives the compression wave that launch back in the shaft bottom simultaneously with described casing pressure sensor (1).
4. drilling process gas cut position detecting device according to claim 2, it is characterized in that, described gas cut position detecting device realizes that the concrete grammar of gas cut position probing is: described Industrial Personal Computer (IPC) (5) sends the instruction that reduces aperture to the choke valve that surges (4), the aperture of described choke valve (4) reduces rapidly to suppress gas cut, and the choke valve that surges (4) produces compression wave; Receive time of compression wave according to two pressure sensors, the compression wave of determining to return from the shaft bottom is in drilling rod and airborne time difference of ring; Built-in gas cut position probing software in the described Industrial Personal Computer (IPC) (5), according to the annular hydraulics model each parameter is calculated, determine to occur the accurate location of gas cut, show the gas cut position at Industrial Personal Computer (IPC) (5), and send next step throttle valve adjustment instruction by data command transmission line (6) to the choke valve that surges (4) according to result of calculation.
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| CN113494289A (en) * | 2020-03-18 | 2021-10-12 | 中国海洋石油集团有限公司 | Oil gas drilling hydrogen sulfide invasion early monitoring device based on semiconductor current transformation |
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