CN104481436A - Method and system for regulating precision pressure-control well drilling throttle valve - Google Patents
Method and system for regulating precision pressure-control well drilling throttle valve Download PDFInfo
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- CN104481436A CN104481436A CN201410742931.9A CN201410742931A CN104481436A CN 104481436 A CN104481436 A CN 104481436A CN 201410742931 A CN201410742931 A CN 201410742931A CN 104481436 A CN104481436 A CN 104481436A
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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
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
Abstract
An embodiment of the invention provides a method and a system for regulating a precision pressure-control well drilling throttle valve. The method includes acquiring displacement of a mud pump of a precision pressure-control well drilling system, displacement of a back-pressure pump and opening values of the throttle valve at a current moment and within a preset duration before the current moment in real time; predicting opening values of the throttle valve within a preset number of sampling periods after the current moment in real time according to the acquired displacement of the mud pump, the acquired displacement of the back-pressure pump and the acquired opening values of the throttle valve; adjusting opening of the throttle valve within the preset number of sampling periods after the current moment so that the opening of the throttle value is equal to the predicted opening values of the throttle valve. Precision pressure-control well drilling requirements can be met by bottom hole pressures corresponding to the predicted opening values of the throttle valve. According to the scheme, the method and the system have the advantages that the opening values of the throttle valve within the preset number of sampling periods after the current moment are predicted according to the displacement of the mud pump, the displacement of the back-pressure pump and the opening values of the throttle valve at the current moment and within the preset duration after the current moment, and accordingly the precision pressure-control well drilling throttle valve regulation effectiveness can be improved.
Description
Technical field
The present invention relates to meticulous controlled pressure drilling technical field, particularly a kind of control method of meticulous controlled pressure drilling choke valve and system.
Background technology
Meticulous controlled pressure drilling technology is a technology that can realize balance or near-balance drilling.Its object is to determine bottom pressure window, accurately control annular pressure section, make the pressure of whole pit shaft maintain between formation pore pressure and fracture pressure, solve the difficult problem in drilling well.Its workflow is: in the circulating system closed, drilling fluid enters standpipe by borehole pump and drops to drilling rod from slurry tank, by the annular space on float valve and drill bit top, then flows out from the annular preventer below rotating control assembly.Pass through a series of choke valve again to vibrosieve or degasser, finally get back to slurry tank.Its controlled pressure principle is: in drilling process, strata pressure equilibrium equation in pit shaft is: bottom pressure=wellhead back pressure+fluid pressure+annular pressure lost, in actual well drilled work, because fluid pressure, annular pressure lost are geostationary under set wellbore conditions, property of drilling fluid and certain flow condition, wellhead back pressure is only had to be easy to change, therefore by controlling wellhead back pressure, the interval that bottom pressure is being applicable to, realizes not leaking and does not overflow or have micro-leakage of control or micro-overflow.Needed for pressure balance, by regulating the throttle valve opening on choke manifold to change wellhead back pressure, finally reaching the pressure balance of pit shaft, improving the safety of drilling well.
The key that meticulous controlled pressure drilling normally works is can stable and accurate control throttle valve opening, and will realize this goal, accurately meticulous controlled pressure drilling controlling calculation model must be set up, but on the one hand, due to multiple parameter will be considered, as back pressure, fluid density, fluid rheology, annular space liquid level, flow resistance and well geometric shape etc., even if the controlling calculation model set up, its structure is also very complicated, is difficult to realize accurate control; On the other hand, from application of engineering project, the Controlling model set up need simplify as far as possible, still good performance can be maintained under the impact of uncertain factor, and require that control algolithm is simple, be easy to realize, to meet the needs controlled in real time, and actual well drilled process usually has non-linear, time variation and uncertainty; Therefore make to be difficult to set up accurate meticulous controlled pressure drilling controlling calculation model.
At present, in prior art, meticulous controlled pressure drilling adopts PID (proportional-integral-differential) control method to control the adjustment of choke valve, but PID control method can only deacclimatize the uncertain factor of drilling process with one group of changeless pid parameter, often can not meet this Multivariable Coupling of bored shaft stratum system completely, non-linear, the complication systems such as large dead time, and when pid parameter change exceedes certain limit, the performance of bored shaft stratum system can obviously be deteriorated, even requirement cannot be reached, make in the process controlling throttle valve opening in bored shaft stratum system, the Multivariable Coupling of bored shaft stratum system can not be overcome, non-linear, probabilistic impact such as large dead time, reduce the validity to meticulous controlled pressure drilling throttle valve adjustment.
Summary of the invention
Embodiments provide a kind of control method of meticulous controlled pressure drilling choke valve, to improve the validity to meticulous controlled pressure drilling throttle valve adjustment.The method comprises: the opening value of mud pump delivery, back pressure pump delivery and choke valve in meticulous managed pressure drilling system in preset duration before Real-time Obtaining current time and current time; According to the opening value of the mud pump delivery obtained, back pressure pump delivery and choke valve, preset the throttle valve opening value in sampling period after real-time estimate current time, bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling; The aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction.
In one embodiment, the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction, comprise: according to the drilling condition of meticulous controlled pressure drilling, set the reference wellhead back pressure in meticulous each moment of controlled pressure drilling, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling; In real time wellhead back pressure corresponding for the throttle valve opening value of prediction and described reference wellhead back pressure are compared, the difference of the wellhead back pressure of both acquisitions; The throttle valve opening value corresponding with the difference of this wellhead back pressure is calculated according to the two the difference of wellhead back pressure described; According to the throttle valve opening value calculated, the opening value of the mud pump delivery that adjustment obtains, back pressure pump delivery and choke valve, and according to the opening value of mud pump delivery, back pressure pump delivery and choke valve after adjustment, after again predicting current time, preset the throttle valve opening value in the sampling period; The aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value again predicted.
In one embodiment, after the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction, also comprise: after detecting current time, preset the bottom pressure of specifying the moment in the sampling period; Throttle valve opening corresponding for the appointment moment bottom pressure detected is deducted the throttle valve opening value in this appointment moment of prediction, draw the difference of the throttle valve opening value of the two; The aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the throttle valve opening value of prediction and the difference of described throttle valve opening value with.
The embodiment of the present invention additionally provides a kind of regulating system of meticulous controlled pressure drilling choke valve, to improve the validity to meticulous controlled pressure drilling throttle valve adjustment.This system comprises: sensor, for the opening value of mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before Real-time Obtaining current time and current time, and the computing equipment outside the regulating system opening value of the mud pump delivery of acquisition, back pressure pump delivery and choke valve being exported to meticulous controlled pressure drilling choke valve; Receiving interface, for presetting the choke valve prediction opening value in sampling period after receiving current time that described computing equipment sends, this choke valve prediction opening value is that described computing equipment obtains according to the opening value prediction of the mud pump delivery obtained, back pressure pump delivery and choke valve, and the bottom pressure that this choke valve prediction opening value is corresponding meets the safety requirements of meticulous controlled pressure drilling; Choke valve, for being adjusted to choke valve prediction opening value by the aperture presetting choke valve in the sampling period after current time.
In one embodiment, also comprise: input equipment, for receiving the drilling condition of user according to meticulous controlled pressure drilling, the reference wellhead back pressure in meticulous each moment of controlled pressure drilling of setting, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling; Comparator, before for choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, choke valve is predicted the wellhead back pressure that opening value is corresponding and described reference wellhead back pressure compare, the difference of the wellhead back pressure of both acquisitions; Output interface, for flowing to described computing equipment by the difference of described wellhead back pressure; Described receiving interface, also for presetting the choke valve prediction opening value in sampling period after receiving new current time that described computing equipment sends, this new choke valve prediction opening value is that after the opening value of mud pump delivery, back pressure pump delivery and the choke valve that described computing equipment obtains according to the difference adjustment of described wellhead back pressure, prediction obtains again; Described choke valve, also for the aperture presetting choke valve in the sampling period after current time being adjusted to new choke valve prediction opening value.
In one embodiment, also comprise: detector, after for described choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, after detecting current time in real time, preset the bottom pressure of specifying the moment in the sampling period; Subtracter, for throttle valve opening corresponding for the appointment detected moment bottom pressure being deducted the choke valve prediction opening value in this appointment moment, draws the difference of the throttle valve opening value of the two; Described choke valve, also for the aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the difference of choke valve prediction opening value and described throttle valve opening value with.
In embodiments of the present invention, due to the opening value by mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before current time and current time, preset the throttle valve opening value in the sampling period after predicting current time, the impact that in meticulous controlled pressure drilling process, various uncertainty and complicated change control bottom pressure can be overcome well; Bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling, and the aperture of choke valve is adjusted according to the throttle valve opening value of prediction, thus the validity that can improve meticulous controlled pressure drilling throttle valve adjustment, and then bottom pressure in meticulous controlled pressure drilling process can be made effectively to maintain balance.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the control method of a kind of meticulous controlled pressure drilling choke valve that the embodiment of the present invention provides;
Fig. 2 is the schematic diagram of a kind of meticulous managed pressure drilling system that the embodiment of the present invention provides;
Fig. 3 is the structured flowchart of the regulating system of a kind of meticulous controlled pressure drilling choke valve that the embodiment of the present invention provides.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
In embodiments of the present invention, provide a kind of control method of meticulous controlled pressure drilling choke valve, as shown in Figure 1, the method comprises:
Step 101: the opening value of mud pump delivery, back pressure pump delivery and choke valve in meticulous managed pressure drilling system in preset duration before Real-time Obtaining current time and current time;
Step 102: according to the opening value of the mud pump delivery obtained, back pressure pump delivery and choke valve, preset the throttle valve opening value in sampling period after real-time estimate current time, bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling;
Step 103: the throttle valve opening value aperture presetting choke valve in the sampling period after current time being adjusted to prediction.
Flow process is as shown in Figure 1 known, in embodiments of the present invention, due to the opening value by mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before current time and current time, preset the throttle valve opening value in the sampling period after predicting current time, the impact that in meticulous controlled pressure drilling process, various uncertainty and complicated change control bottom pressure can be overcome well; Bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling, and the aperture of choke valve is adjusted according to the throttle valve opening value of prediction, thus the validity that can improve meticulous controlled pressure drilling throttle valve adjustment, and then bottom pressure in meticulous controlled pressure drilling process can be made effectively to maintain balance.
During concrete enforcement, mud pump delivery in meticulous managed pressure drilling system in preset duration before can coming Real-time Collection current time and current time by sensor device, the opening value of back pressure pump delivery and choke valve, (in Fig. 2, solid line is drilling fluid flow circuits as shown in Figure 2, dotted line is the control circuit of meticulous controlled pressure drilling throttle valve adjustment), this sensor can be arranged on slush pump 201 respectively, choke valve 202 and backpressure pump 203 place, and by will mud pump delivery in meticulous managed pressure drilling system in preset duration before the current time that collect and current time, the data such as the opening value of back pressure pump delivery and choke valve are transferred to nonlinear prediction device 205, this nonlinear prediction device 205 is according to mud pump delivery in meticulous managed pressure drilling system in preset duration before the current time received and current time, the data such as the opening value of back pressure pump delivery and choke valve, the throttle valve opening value in the sampling period is preset after carrying out real-time estimate current time, and the throttle valve opening value of prediction is transferred to choke valve 202, so that the aperture preset in the sampling period after current time is adjusted to the throttle valve opening value of prediction by choke valve 202, drilling fluid in mud pit 204 enters in pit shaft 206 by the choke valve 202 adjusting aperture, to make the wellhead back pressure of meticulous controlled pressure drilling pit shaft 206 within the scope of control overflow, and then while making the bottom pressure of meticulous controlled pressure drilling pit shaft 206 reach control overflow, meet the safety requirements of meticulous controlled pressure drilling.
During concrete enforcement, those skilled in the art know how to predict throttle valve opening value according to the opening value of mud pump delivery, back pressure pump delivery and choke valve, concrete, above-mentioned nonlinear prediction device 205 predicts that the process of throttle valve opening value can be realized by Nonlinear Prediction Models, and this Nonlinear Prediction Models specifically can adopt existing following formula:
～x(k)＝f
p[～x(k-1),～u(k-1),～v(k-1)] (1)
～y(k)＝g
p[～x(k)] (2)
F
pfor according to previous moment for calculating the state parameter ~ x (k-1) of bottom pressure (such as, backpressure pump discharge capacity), previous moment throttle valve opening ~ u (k-1) and previous moment slush pump pump speed ~ v (k-1) (or slush pump discharge capacity), calculate current time for calculating the computation model of the state parameter ~ x (k) of bottom pressure; g
pfor according to current time for the state parameter ~ x (k) calculating bottom pressure calculate current time prediction throttle valve opening value ~ y (k), k are current time.In the control procedure of drilling well, according to the desired value calculating bottom pressure for the state parameter calculating bottom pressure in certain moment, then can compare with actual measurement bottom pressure value.
During concrete enforcement, because the process of prediction throttle valve opening value is closed loop control algorithm, exist again non-linear in actual well drilled process, in time, becomes, model mismatch, the impact of the factors such as interference, the throttle valve opening value obtained to enable prediction is revised in time, reach control overflow, to improve the stability of meticulous controlled pressure drilling throttle valve adjustment, in the present embodiment, the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction, comprise: according to the drilling condition of meticulous controlled pressure drilling, set the reference wellhead back pressure in meticulous each moment of controlled pressure drilling, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling, in real time wellhead back pressure corresponding for the throttle valve opening value of prediction and described reference wellhead back pressure are compared, the difference of the wellhead back pressure of both acquisitions, the throttle valve opening value corresponding with the difference of this wellhead back pressure is calculated according to the two the difference of wellhead back pressure described, according to the throttle valve opening value calculated, the opening value of the mud pump delivery that adjustment obtains, back pressure pump delivery and choke valve, and according to the opening value of mud pump delivery, back pressure pump delivery and choke valve after adjustment, again preset the throttle valve opening value in the sampling period after predicting current time, the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value again predicted.Concrete, wellhead back pressure corresponding for the throttle valve opening value presetting each moment in the sampling period after the current time of prediction can be compared with reference to wellhead back pressure, draw the difference of the wellhead back pressure of the two of each moment, such as, the difference of the wellhead back pressure of the two of each moment can be drawn: minQ (r, ~ y)=∑ by following formula
i ∈ p[r (k+i/k)-y ((k+i/k))]
2, wherein, minQ (r, ~ y) be the difference of the wellhead back pressure of the two of each moment, r (k+i/k) is the reference wellhead back pressure in k+i moment, y ((k+i/k)) is wellhead back pressure corresponding to the prediction throttle valve opening value in k+i moment, i is time step, p presets a sampling period after being current time, calculate the throttle valve opening value that the difference of this wellhead back pressure is corresponding again, according to the mud pump delivery that the throttle valve opening value adjustment of calculating obtains, the opening value of back pressure pump delivery and choke valve, and according to the mud pump delivery after adjustment, the opening value of back pressure pump delivery and choke valve, again the throttle valve opening value in the sampling period is preset after predicting current time, make the throttle valve opening value again predicted closer to reference to throttle valve opening value corresponding to wellhead back pressure, or the throttle valve opening value of prediction is added or deducts the throttle valve opening value corresponding with the difference of wellhead back pressure, to make the throttle valve opening value after addition or subtraction closer to reference to throttle valve opening value corresponding to wellhead back pressure.
In addition, when there is the emergency case such as leakage, well kick and causing bottom pressure to change, by the throttle valve opening value corresponding closer to reference wellhead back pressure by the adjustment of the throttle valve opening value of prediction, bottom pressure can be kept to be more excessively with reference to bottom pressure corresponding to wellhead back pressure, avoid the situation of the throttle valve opening controlled quentity controlled variable applying amplitude, thus contribute to carrying out smoothly of drilling well.Concrete, the process of the reference wellhead back pressure in above-mentioned setting meticulous each moment of controlled pressure drilling can by realizing with minor function:
R (k+i/k) representative dopes the reference wellhead back pressure value in k+i moment according to the correlation value calculation in current k moment; y
reffor reference strata pressure; Y (k) is the well head pressure value that current time prediction throttle valve opening value ~ y (k) is corresponding; T
sfor time step; T
refbe time response, i is time step, such as, and i=1,2,3 ... second.
During concrete enforcement, because the meticulous managed pressure drilling system of reality exists some uncertainty, when the throttle valve opening value of usage forecastings controls throttle valve opening, the bottom pressure that the bottom pressure of actual meticulous managed pressure drilling system is corresponding with the throttle valve opening value of prediction is inconsistent, in order to rise to the precision of throttle valve adjustment, in the present embodiment, after the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction, also comprise: preset in the individual sampling period after detecting current time in real time and specify the bottom pressure in moment (such as, the bottom pressure of pit shaft 206 in Fig. 2), throttle valve opening corresponding for the appointment moment bottom pressure detected is deducted the throttle valve opening value in this appointment moment of prediction, draw the difference (i.e. predicated error) of the throttle valve opening value of the two, the aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the throttle valve opening value of prediction and the difference of described throttle valve opening value with.Such as, the throttle valve opening value of prediction is 5, and throttle valve opening is adjusted to 4 of throttle valve opening corresponding to the bottom pressure after 5, namely predicated error is the difference-1 of 4 and 5, when subsequent time regulates throttle valve opening, be adjusted to again on choke valve after the prediction opening value of subsequent time is added-1.Concrete, the difference (i.e. predicated error) of the throttle valve opening value of the two can be drawn by following formula:
e(k)＝z(k)-～y(k/k-1) (4)
Wherein, e (k) is the predicated error in k moment, and z (k) is the throttle valve opening that the bottom pressure that detects in the k moment is corresponding, and ~ y (k/k-1) is the throttle valve opening value predicted in the k moment.
In like manner ask e (k), e (k-1) ... the predicated errors such as e (1), carry out error prediction correction according to the control information of history, thus improve control accuracy.
Describe below in conjunction with concrete example the control method that above-mentioned meticulous pressure control bores choke valve in detail, concrete, the method comprises:
Step 1: the control objectives determining meticulous controlled pressure drilling.According to meticulous controlled pressure drilling Practical Project situation and drilling parameter (as: well type, well not, casing programme, well depth, stratum three pressure traverse, the factor such as drilling fluid density design) under the prerequisite ensureing meticulous controlled pressure drilling safety, determine meticulous controlled pressure drilling scheme and control objectives.In meticulous controlled pressure drilling, control objectives mainly contains throttle valve opening u (span is generally 10%-90%) and bottom pressure y (bottom pressure need be more than or equal to formation pore pressure, is less than formation fracture pressure).Setup control initial value.
Step 2: setting reference locus, the i.e. track of the reference wellhead back pressure composition in meticulous each moment of controlled pressure drilling.When meticulous controlled pressure drilling process, if occur leakage, well kick etc. suddenly situation time bottom pressure can be caused to change, in order to ensure carrying out smoothly of drilling well, just require that changing throttle valve opening follows the tracks of rapidly this change, normally applies the throttle valve opening control variables of amplitude.It is not steady that this can cause bottom pressure in meticulous controlled pressure drilling process to control change.For this reason, the application presets a reference locus, wellhead back pressure corresponding for the throttle valve opening value presetting each moment in the sampling period after the current time of prediction is compared with reference to wellhead back pressure, draw the difference of the wellhead back pressure of the two of each moment, calculate the throttle valve opening value that the difference of this wellhead back pressure is corresponding again, according to the mud pump delivery that the throttle valve opening value adjustment of calculating obtains, the opening value of back pressure pump delivery and choke valve, and according to the mud pump delivery after adjustment, the opening value of back pressure pump delivery and choke valve, again the throttle valve opening value in the sampling period is preset after predicting current time, the aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value again predicted, make the throttle valve opening value again predicted closer to reference to throttle valve opening value corresponding to wellhead back pressure, with keep bottom pressure more reposefully transition for reference to bottom pressure corresponding to wellhead back pressure.
Step 3: set up Nonlinear Prediction Models.Nonlinear Model Predictive Control is a kind of control algolithm of model.According to historical information and the following input of model, predict following output by model.The Nonlinear Prediction Models set up does not need the requirement to the strict mathematical model of model structure in Traditional control, but the approach Modling model of most convenient is pressed according to functional requirement, concrete, formula (1) can be passed through and (2) realize, namely by formula (1) and (2) opening value according to the mud pump delivery obtained, back pressure pump delivery and choke valve, the throttle valve opening value in the individual sampling period after real-time estimate current time, is preset.
Step 4: rolling optimization.Nonlinear Model Predictive Control is a kind of closed loop control algorithm, exist again non-linear in actual well drilled process, in time, becomes, model mismatch, the impact of the factors such as interference, the throttle valve opening value obtained to enable prediction is revised in time, wellhead back pressure between the wellhead back pressure that after drawing the current time of prediction, in the default sampling period, the throttle valve opening value in each moment is corresponding and reference wellhead back pressure is poor, and according to the mud pump delivery that the adjustment of wellhead back pressure difference obtains, the opening value of back pressure pump delivery and choke valve, and according to the mud pump delivery after adjustment, the opening value of back pressure pump delivery and choke valve, again the throttle valve opening value in the sampling period is preset after predicting current time, the object of rolling optimization obtains control action sequence, make to optimize prediction throttle valve opening value in time domain as much as possible close to reference locus.
Step 5: feedback compensation.Nonlinear time-varying is there is in real work, the uncertain factor such as model mismatch and interference, make the bottom pressure that the bottom pressure of actual meticulous managed pressure drilling system is corresponding with the throttle valve opening value of prediction inconsistent, the difference (i.e. predicated error) of the throttle valve opening value between the throttle valve opening value in the throttle valve opening corresponding by the appointment moment bottom pressure detected in real time and this appointment moment of prediction, and the throttle valve opening value of prediction is adjusted according to predicated error, such as, the throttle valve opening value of prediction is added or deducts predicated error, the aperture of choke valve is controlled according to the throttle valve opening value after adjustment.
Based on same inventive concept, additionally provide a kind of regulating system of meticulous controlled pressure drilling choke valve in the embodiment of the present invention, as described in the following examples.The principle of dealing with problems due to the regulating system of meticulous controlled pressure drilling choke valve is similar to the control method of meticulous controlled pressure drilling choke valve, therefore the enforcement of the regulating system of meticulous controlled pressure drilling choke valve see the enforcement of the control method of meticulous controlled pressure drilling choke valve, can repeat part and repeats no more.Following used, term " unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.
Fig. 3 is a kind of structured flowchart of the regulating system of the meticulous controlled pressure drilling choke valve of the embodiment of the present invention, as shown in Figure 3, comprising: sensor 301, receiving interface 302 and choke valve 303, be described this structure below.
Sensor 301, for the opening value of mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before Real-time Obtaining current time and current time, and the computing equipment 300 outside the regulating system opening value of the mud pump delivery of acquisition, back pressure pump delivery and choke valve being exported to meticulous controlled pressure drilling choke valve;
Receiving interface 302, be connected with computing equipment 300, for presetting the choke valve prediction opening value in sampling period after receiving current time that described computing equipment sends, this choke valve prediction opening value is that described computing equipment obtains according to the opening value prediction of the mud pump delivery obtained, back pressure pump delivery and choke valve, and the bottom pressure that this choke valve prediction opening value is corresponding meets the safety requirements of meticulous controlled pressure drilling;
Choke valve 303, is connected with receiving interface 302, for the aperture presetting choke valve in the sampling period after current time is adjusted to choke valve prediction opening value.
During concrete enforcement, computing equipment 300 can for there being the equipment of forecast function in prior art, concrete, computing equipment 300 can adopt the prediction implementation method performed in above-mentioned nonlinear prediction device.
In one embodiment, also comprise: input equipment, for receiving the drilling condition of user according to meticulous controlled pressure drilling, the reference wellhead back pressure in meticulous each moment of controlled pressure drilling of setting, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling; Comparator, be connected with input equipment, before for choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, choke valve is predicted the wellhead back pressure that opening value is corresponding and described reference wellhead back pressure compare, the difference of the wellhead back pressure of both acquisitions; Output interface, is connected with comparator, for the difference of described wellhead back pressure is flowed to described computing equipment; Described receiving interface, be connected with computing equipment, also for presetting the choke valve prediction opening value in sampling period after receiving new current time that described computing equipment sends, this new choke valve prediction opening value is that after the opening value of mud pump delivery, back pressure pump delivery and the choke valve that described computing equipment obtains according to the difference adjustment of described wellhead back pressure, prediction obtains again; Described choke valve, also for the aperture presetting choke valve in the sampling period after current time being adjusted to new choke valve prediction opening value.
In one embodiment, also comprise: detector, after for described choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, after detecting current time in real time, preset the bottom pressure of specifying the moment in the sampling period; Subtracter, is connected with detector, for throttle valve opening corresponding for the appointment detected moment bottom pressure being deducted the choke valve prediction opening value in this appointment moment, draws the difference of the throttle valve opening value of the two; Described choke valve, is connected with subtracter, also for the aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the difference of choke valve prediction opening value and described throttle valve opening value with.
In embodiments of the present invention, due to the opening value by mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before current time and current time, preset the throttle valve opening value in the sampling period after predicting current time, the impact that in meticulous controlled pressure drilling process, various uncertainty and complicated change control bottom pressure can be overcome well; Bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling, and the aperture of choke valve is adjusted according to the throttle valve opening value of prediction, thus the validity that can improve meticulous controlled pressure drilling throttle valve adjustment, and then bottom pressure in meticulous controlled pressure drilling process can be made effectively to maintain balance.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a control method for meticulous controlled pressure drilling choke valve, is characterized in that, comprising:
The opening value of mud pump delivery, back pressure pump delivery and choke valve in meticulous managed pressure drilling system in preset duration before Real-time Obtaining current time and current time;
According to the opening value of the mud pump delivery obtained, back pressure pump delivery and choke valve, preset the throttle valve opening value in sampling period after real-time estimate current time, bottom pressure corresponding to the throttle valve opening value of this prediction meets the safety requirements of meticulous controlled pressure drilling;
The aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value of prediction.
2. the control method of meticulous controlled pressure drilling choke valve as claimed in claim 1, is characterized in that, the aperture presetting choke valve in the sampling period is adjusted to the throttle valve opening value of prediction, comprises after current time:
According to the drilling condition of meticulous controlled pressure drilling, set the reference wellhead back pressure in meticulous each moment of controlled pressure drilling, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling;
In real time wellhead back pressure corresponding for the throttle valve opening value of prediction and described reference wellhead back pressure are compared, the difference of the wellhead back pressure of both acquisitions;
The throttle valve opening value corresponding with the difference of this wellhead back pressure is calculated according to the two the difference of wellhead back pressure described;
According to the throttle valve opening value calculated, the opening value of the mud pump delivery that adjustment obtains, back pressure pump delivery and choke valve, and according to the opening value of mud pump delivery, back pressure pump delivery and choke valve after adjustment, after again predicting current time, preset the throttle valve opening value in the sampling period;
The aperture presetting choke valve in the sampling period after current time is adjusted to the throttle valve opening value again predicted.
3. the control method of meticulous controlled pressure drilling choke valve as claimed in claim 1 or 2, is characterized in that, after the aperture presetting choke valve in the sampling period is adjusted to the throttle valve opening value of prediction, also comprises after current time:
The bottom pressure of specifying the moment in the sampling period is preset after detecting current time;
Throttle valve opening corresponding for the appointment moment bottom pressure detected is deducted the throttle valve opening value in this appointment moment of prediction, draw the difference of the throttle valve opening value of the two;
The aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the throttle valve opening value of prediction and the difference of described throttle valve opening value with.
4. a regulating system for meticulous controlled pressure drilling choke valve, is characterized in that, comprising:
Sensor, for the opening value of mud pump delivery, back pressure pump delivery and choke valve in managed pressure drilling system meticulous in preset duration before Real-time Obtaining current time and current time, and the computing equipment outside the regulating system opening value of the mud pump delivery of acquisition, back pressure pump delivery and choke valve being exported to meticulous controlled pressure drilling choke valve;
Receiving interface, for presetting the choke valve prediction opening value in sampling period after receiving current time that described computing equipment sends, this choke valve prediction opening value is that described computing equipment obtains according to the opening value prediction of the mud pump delivery obtained, back pressure pump delivery and choke valve, and the bottom pressure that this choke valve prediction opening value is corresponding meets the safety requirements of meticulous controlled pressure drilling;
Choke valve, for being adjusted to choke valve prediction opening value by the aperture presetting choke valve in the sampling period after current time.
5. the regulating system of meticulous controlled pressure drilling choke valve as claimed in claim 4, is characterized in that, also comprise:
Input equipment, for receiving the drilling condition of user according to meticulous controlled pressure drilling, the reference wellhead back pressure in meticulous each moment of controlled pressure drilling of setting, the bottom pressure that this reference wellhead back pressure is corresponding meets the safety requirements of meticulous controlled pressure drilling;
Comparator, before for choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, choke valve is predicted the wellhead back pressure that opening value is corresponding and described reference wellhead back pressure compare, the difference of the wellhead back pressure of both acquisitions;
Output interface, for flowing to described computing equipment by the difference of described wellhead back pressure;
Described receiving interface, also for presetting the choke valve prediction opening value in sampling period after receiving new current time that described computing equipment sends, this new choke valve prediction opening value is that after the opening value of mud pump delivery, back pressure pump delivery and the choke valve that described computing equipment obtains according to the difference adjustment of described wellhead back pressure, prediction obtains again;
Described choke valve, also for the aperture presetting choke valve in the sampling period after current time being adjusted to new choke valve prediction opening value.
6. the regulating system of the meticulous controlled pressure drilling choke valve as described in claim 4 or 5, is characterized in that, also comprise:
Detector, after for described choke valve the aperture presetting choke valve in sampling period after current time being adjusted to choke valve prediction opening value, presets the bottom pressure of specifying the moment in the sampling period after detecting current time in real time;
Subtracter, for throttle valve opening corresponding for the appointment detected moment bottom pressure being deducted the choke valve prediction opening value in this appointment moment, draws the difference of the throttle valve opening value of the two;
Described choke valve, also for the aperture of the choke valve after specifying the moment will be preset in sampling period after current time, be adjusted to the difference of choke valve prediction opening value and described throttle valve opening value with.
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| CN113255080A (en) * | 2021-06-04 | 2021-08-13 | 西南石油大学 | Composite drill bit optimization method based on fine pressure control drilling technology |
| CN114185265A (en) * | 2022-02-15 | 2022-03-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Large-scale opening jet flow wind tunnel ultrasonic speed constant total pressure continuous variable Mach number control method |
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