CN109538144A - A kind of wellhead back pressure automatic control system and method - Google Patents
A kind of wellhead back pressure automatic control system and method Download PDFInfo
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- CN109538144A CN109538144A CN201910002003.1A CN201910002003A CN109538144A CN 109538144 A CN109538144 A CN 109538144A CN 201910002003 A CN201910002003 A CN 201910002003A CN 109538144 A CN109538144 A CN 109538144A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 40
- 125000002015 acyclic group Chemical group 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 239000009096 changqing Substances 0.000 abstract description 10
- 238000011160 research Methods 0.000 abstract description 6
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000013011 mating Effects 0.000 abstract 1
- 238000012937 correction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention belongs to controlled pressure drilling field of engineering technology, more particularly to a kind of wellhead back pressure automatic control system and method, including first pressure sensor, second pressure sensor, third pressure sensor, compensation pump, throttle valve, rotary depth sensor and analyzer-controller；It is higher to solve mating more, the control pressurer system complexity of existing fine pressure control facilities, input cost, the Development Strategy of Changqing oilfields low cost is not met, later period promotes more difficult problem, the present invention realizes that wellhead back pressure automatically controls, meet overall process well head controlled pressure drilling demand, safety work ability is improved, Changqing oilfields is reduced and fills the water region well control risk, helps to research and develop the inexpensive pressure automatic control system for being suitble to water filling region well head controlled pressure drilling and optimization process matched therewith.
Description
Technical field
The invention belongs to controlled pressure drilling field of engineering technology, and in particular to a kind of wellhead back pressure automatic control system and side
Method.
Background technique
Well head controlled pressure drilling have the characteristics that it is economical, effective, reliable, since its corollary equipment is few, input cost is lower, skill
Art is with strong points, can effectively reduce well control risk, and simple process, strong operability are rapid in Changqing oilfields waterflooding extraction region
Popularization is got up, and realizes Changqing oilfields water filling region overflow water outlet, associated gas, leak with the safety deposited etc. under different flooded conditions
Drilling.But in the case where the well head controlled pressure drilling operation that Changqing oilfields water filling region is implemented only is confined to normal drilling condition, realization pair
The control of wellhead back pressure size is unable to satisfy the wellhead back pressure control when operating conditions such as making up a joint, make a trip, can not achieve overall process
Well head controlled pressure drilling, the main reason is that matching equipment is incomplete.Although fine pressure control equipment is able to satisfy overall process at present
Controlled pressure drilling job requirements, but its coordinative composition of equipments it is more (back pressure compensate pumps, PWD, flow measuring system, self-choke manifold
And central control system etc.), control pressurer system complicated (need to monitor by bottom pressure, micrometeor monitoring etc.), investment at
This is higher, does not meet the Development Strategy of Changqing oilfields low cost, and the later period promotes more difficult.In order to keep economical, effective, reliable
Principle realize drilling well overall process wellhead back pressure automatically control, improve water filling region well head controlled pressure drilling safety work ability,
The inexpensive pressure automatic control system research for being suitble to water filling region well head controlled pressure drilling need to be carried out, wherein wellhead back pressure is controlled automatically
Method processed is the key that successfully to develop inexpensive pressure automatic control system, there is an urgent need to carry out as system research and development core
For Journal of Sex Research.
Summary of the invention
A kind of wellhead back pressure automatic control system purpose provided by the invention is first is that overcome Changqing oilfields note in the prior art
Since matching equipment is incomplete in the well head controlled pressure drilling operation that water area is implemented, only it is confined under normal drilling condition, it is real
Now to the control of wellhead back pressure size, it is unable to satisfy the wellhead back pressure control when operating conditions such as making up a joint, make a trip, can not achieve complete
The problem of well head controlled pressure drilling of process；Although purpose is second is that overcome in the prior art that fine pressure control equipment is able to satisfy mistake entirely at present
The controlled pressure drilling job requirements of journey, but its coordinative composition of equipments more (back pressure compensation pumps, PWD, flow measuring system, self-choke pipe
Converge and central control system etc.), control pressurer system complicated (need to monitor by bottom pressure, micrometeor monitoring etc.), investment
Higher cost does not meet the Development Strategy of Changqing oilfields low cost, and the later period promotes more difficult problem.
For this purpose, the present invention provides a kind of wellhead back pressure automatic control system, including first pressure sensor, second pressure
Sensor, third pressure sensor, compensation pump, throttle valve, rotary depth sensor and analyzer-controller, first pressure sensor connection
Well head standpipe, rotary depth sensor are connected in well head by high pressure line, and compensation pump one end connects second pressure sensor, compensation pump
The other end connects well head entrance by high pressure line, and well head outlet connects third pressure sensor one end by high pressure line, the
The three pressure sensor other ends connect throttle valve；Analyzer-controller by signal transmssion line be separately connected first pressure sensor,
Second pressure sensor, third pressure sensor, throttle valve and rotary depth sensor.
The analyzer-controller is used to obtain data, analysis data and executes operation, and analysis data are the data that will acquire
It is analyzed, executing operation is executed according to the result of analysis data, and the data that analyzer-controller obtains data include defeated
Enter underlying parameter data and real-time parameter data.
The underlying parameter data include stop and start pump decision content Psp, default wellhead back pressure value Pwd, preset acyclic operating condition well
Mouth back pressure value Pma, pressure controling precision Pca, closing well seek pressure value Pcw, closing well seek kill-job depth Hcw, property of drilling fluid and discharge capacity, well bore
Structure, drill assembly.
The real-time parameter data pass through first pressure sensor, second pressure sensor, third pressure sensor and well
Deep sensor measures, and the first pressure sensor is used to survey standpipe pressure Pd, second pressure sensor be used to survey compensation source pressure
Power Psc, third pressure sensor be used to survey wellhead back pressure Pw, rotary depth sensor be used to survey real-time well depth Hrt。
The analyzer-controller includes automatic control mode and MANUAL CONTROL mode.
A kind of wellhead back pressure autocontrol method, includes the following steps:
1) data, analyzer-controller input underlying parameter data and real-time parameter data are obtained and are stored；
2) data are analyzed, analyzer-controller carries out the data that step 1) obtains the pressure for realizing judgement operation is calculated
Data, and carry out operating condition and control operation judges；
3) operation is executed, for analyzer-controller according to operating condition and control operation judges, wellhead back pressure is realized in instruction of formulating and implementing
It automatically controls.
The pressure data of step 2) the judgement operation seeks pressure value P according to closing wellcw, closing well seek kill-job depth Hcw, real-time well depth
Hrt, property of drilling fluid and discharge capacity, casing programme, drill assembly parameter, to default wellhead back pressure value Pwd, preset acyclic operating condition
Wellhead back pressure value PmaIt is corrected calculating, and final data is stored in analyzer-controller.
Step 2) the operating condition and control operation judges are as follows:
If 31) Pd> Psp、Pwd=0, it is drilling condition, does not execute automatic pressure-controlled operation；
If 32) Pd> Psp、Pwd> 0 is drilling condition, executes automatic pressure-controlled operation；
If 33) Pd< Psp、Psc< Psp、Pma=0, stop one of three kinds of operating conditions to make up a joint, making a trip or wait, compensation pump is not
Execute pressure compensation operation；
If 34) Pd< Psp、Psc< Psp、Pma> 0 stops one of three kinds of operating conditions to make up a joint, making a trip or wait, and compensation pump is held
Row pressure compensation operation, this only termination of pumping do not stop situation it is serious when consideration；
If 35) Pd< Psp、Psc> Psp、Pma=0, for continuous grouting trip-out operating condition, compensation pump does not execute pressure compensation behaviour
Make；
If 36) Pd< Psp、Psc> Psp、Pma> 0, to make up a joint, it is with pressure make a trip or it is with pressure etc. stop one of three kinds of operating conditions,
Compensation pump executes pressure compensation operation.
The step 3) includes the following steps:
1) if working condition is S31, S33, throttle valve automatic adjustment is full-gear, if P at this timew> 0, then will be automatic
Control model switchs to MANUAL CONTROL mode, and early warning；
2) if working condition is S32, throttle valve automatically adjusts aperture state, so that Pwd- Pca≤Pw≤Pwd+Pca；?
Pw≤Pwd- PcaWhen, throttle valve opening adjusting is small, in Pw≥Pwd+PcaWhen, throttle valve opening tunes up；
3) if working condition is S34, S36, throttle valve automatically adjusts aperture state, so that Pma- Pca≤Pw≤Pma+
Pca；In Pw≤Pma- PcaWhen, throttle valve opening adjusting is small, in Pw≥Pma+PcaWhen, throttle valve opening tunes up；
4) when working condition is S35, throttle valve automatic adjustment is full-gear, Pw> Pca, automatic control mode is switched to
MANUAL CONTROL mode, and early warning.
Beneficial effects of the present invention: this wellhead back pressure automatic control system provided by the invention, it is main to pass through every ginseng
Number input, it is automatic obtain and calculate analysis, carry out working condition judge automatically, instruction of formulating and implementing automatically, throttle valve opening from
Dynamic control realizes that wellhead back pressure automatically controls, meets overall process well head controlled pressure drilling demand, safety work ability improved, into one
Step reduces Changqing oilfields and fills the water region well control risk, helps to research and develop the inexpensive pressure for being suitble to water filling region well head controlled pressure drilling
Automatic control system and optimization process matched therewith.
Detailed description of the invention
The present invention is described in further details below with reference to attached drawing.
Fig. 1 well head pressure control equipment mounting arrangement figure；
Fig. 2 well head pressure control creeps into process；
The automatic control flow chart of Fig. 3 different work operating condition.
Description of symbols: 1, first pressure sensor；2, second pressure sensor；3, third pressure sensor；4, it mends
Repay pump；5, throttle valve；6, rotary depth sensor；7, analyzer-controller.
Specific embodiment
Embodiment 1:
As shown in Figure 1, a kind of wellhead back pressure automatic control system, including first pressure sensor 1, second pressure sensor
2, third pressure sensor 3, compensation pump 4, throttle valve 5, rotary depth sensor 6 and analyzer-controller 7, first pressure sensor 1 connect
Well head standpipe is connect, rotary depth sensor 6 is connected in well head by high pressure line, and 4 one end of compensation pump connect second pressure sensor 2,
Compensation 4 other ends of pump connect well head entrance by high pressure line, and well head outlet connects third pressure sensor 3 by high pressure line
One end, 3 other end of third pressure sensor connect throttle valve 5；Analyzer-controller 7 is separately connected the first pressure by signal transmssion line
Force snesor 1, second pressure sensor 2, third pressure sensor 3, throttle valve 5 and rotary depth sensor 6.
The analyzer-controller 7 is used to obtain data, analysis data and executes operation, and analysis data are the data that will acquire
It is analyzed, executing operation is executed according to the result of analysis data, and the data that analyzer-controller 7 obtains data include defeated
Enter underlying parameter data and real-time parameter data.
The underlying parameter data include stop and start pump decision content Psp, default wellhead back pressure value Pwd, preset acyclic operating condition well
Mouth back pressure value Pma, pressure controling precision Pca, closing well seek pressure value Pcw, closing well seek kill-job depth Hcw, property of drilling fluid and discharge capacity, well bore
Structure, drill assembly.
The real-time parameter data pass through first pressure sensor 1, second pressure sensor 2,3 and of third pressure sensor
Rotary depth sensor 6 measures, and the first pressure sensor 1 is used to survey standpipe pressure Pd, second pressure sensor 2 be used to survey compensation
Source pressure Psc, third pressure sensor 3 be used to survey wellhead back pressure Pw, rotary depth sensor 6 be used to survey real-time well depth Hrt。
The analyzer-controller 7 includes automatic control mode and MANUAL CONTROL mode.
This wellhead back pressure automatic control system provided by the invention, mainly by parameters input, automatic acquisition and
Analysis is calculated, progress working condition judges automatically, formulation and implementation instruction, throttle valve opening automatically control automatically, realizes well head time
Pressure automatically controls, and meets overall process well head controlled pressure drilling demand, improves safety work ability, further decreases Changqing oilfields water filling
Region well control risk helps to research and develop the inexpensive pressure automatic control system for being suitble to water filling region well head controlled pressure drilling and optimization
Process matched therewith.
Embodiment 2:
As Figure 2-3, on the basis of embodiment 1, a kind of wellhead back pressure autocontrol method, includes the following steps:
1) data are obtained, analyzer-controller 7 inputs underlying parameter data and real-time parameter data and stores；
2) data are analyzed, analyzer-controller 7 carries out the data that step 1) obtains the pressure for realizing judgement operation is calculated
Force data, and carry out operating condition and control operation judges；
3) operation is executed, for analyzer-controller 7 according to operating condition and control operation judges, instruction of formulating and implementing realizes that well head returns
Pressure automatically controls.
The pressure data of step 2) the judgement operation seeks pressure value P according to closing wellcw, closing well seek kill-job depth Hcw, real-time well depth
Hrt, property of drilling fluid and discharge capacity, casing programme, drill assembly parameter, to default wellhead back pressure value Pwd, preset acyclic operating condition
Wellhead back pressure value PmaIt is corrected calculating, and final data is stored in analyzer-controller 7.Can be selected it is automatic select corrected value and
Corrected value is selected manually, and if do not executed correction, above-mentioned two parameter executes former input value, and final data is deposited in analyzer-controller 7
Storage.
Step 2) the operating condition and control operation judges are as follows:
If 31) Pd> Psp、Pwd=0, it is drilling condition, does not execute automatic pressure-controlled operation；
If 32) Pd> Psp、Pwd> 0 is drilling condition, executes automatic pressure-controlled operation；
If 33) Pd< Psp、Psc< Psp、Pma=0, stop one of three kinds of operating conditions to make up a joint, making a trip or wait, compensation pump 4 is not
Execute pressure compensation operation；
If 34) Pd< Psp、Psc< Psp、Pma> 0 stops one of three kinds of operating conditions to make up a joint, making a trip or wait, and compensation pump 4 is held
Row pressure compensation operation, this only termination of pumping do not stop situation it is serious when consideration；
If 35) Pd< Psp、Psc> Psp、Pma=0, for continuous grouting trip-out operating condition, compensation pump 4 does not execute pressure compensation behaviour
Make；
If 36) Pd< Psp、Psc> Psp、Pma> 0, to make up a joint, it is with pressure make a trip or it is with pressure etc. stop one of three kinds of operating conditions,
Compensation pump 4 executes pressure compensation operation.
The step 3) includes the following steps:
1) if working condition is S31, S33, the automatic adjustment of throttle valve 5 is full-gear, if P at this timew> 0, then will be certainly
Dynamic control model switchs to MANUAL CONTROL mode, and early warning；
2) if working condition is S32, throttle valve 5 automatically adjusts aperture state, so that Pwd- Pca≤Pw≤Pwd+Pca；?
Pw≤Pwd- PcaWhen, 5 aperture regulation of throttle valve is small, in Pw≥Pwd+PcaWhen, 5 aperture of throttle valve tunes up；
3) if working condition is S34, S36, throttle valve 5 automatically adjusts aperture state, so that Pma- Pca≤Pw≤Pma+
Pca；In Pw≤Pma- PcaWhen, 5 aperture regulation of throttle valve is small, in Pw≥Pma+PcaWhen, 5 aperture of throttle valve tunes up；
4) when working condition is S35, the automatic adjustment of throttle valve 5 is full-gear, Pw> Pca, automatic control mode is switched to
MANUAL CONTROL mode, and early warning.
In throttle valve automatic adjustment aperture state control well head pressure, △ ︱ Pw- Pwd︱ is bigger, adjusts movement speed and gets over
Fastly, conversely, reducing movement speed；
Under automatic mode, analysis and instruction execution can be read in real time by data, realize that the well head under different operating conditions returns
Pressure automatically controls.But under MANUAL CONTROL mode, such as needs to realize that pressure automatically controls, need to be adjusted to automatic control mould manually
Formula.
Beneficial effects of the present invention: the present invention is a kind of based on kinetic pump source signal data and basic data calculating by proposing
Analysis carries out the method that well head managed pressure drilling system judges automatically and pressure controls, and helps to research and develop suitable water filling region well head control
Press the inexpensive pressure automatic control system and optimization process matched therewith of drilling well.System based on this method can judge automatically work
Condition, automatically controls throttle valve opening at automatic instruction of formulating and implementing, and realizes that wellhead back pressure automatically controls, meets the water filling full mistake in region
Journey well head controlled pressure drilling demand, further decreases oil-field flooding region drilling well control risk.
Embodiment 3:
On the basis of embodiment 2, the present invention with well head controlled pressure drilling make up a joint (pressure compensation) operating condition system it is automatic
Judgement and pressure control process are as embodiment.
(1) data are obtained, analyzer-controller 7 inputs underlying parameter data and real-time parameter data and stores；
Input basic data: stop and start pump decision content Psp, default wellhead back pressure value Pwd, preset acyclic operating condition wellhead back pressure
Value Pma, pressure controling precision Pca, closing well seek pressure value Pcw, closing well seek kill-job depth Hcw, property of drilling fluid and discharge capacity, casing programme, brill
Tool combination；
Read sensing data: standpipe pressure Pd, compensation source pressure Psc, wellhead back pressure Pw, real-time well depth Hrt；
(2) data are analyzed, analyzer-controller 7 carries out the data that step 1) obtains the pressure for realizing judgement operation is calculated
Force data, and carry out operating condition and control operation judges；
Data correction: pressure value P is asked according to closing wellcw, closing well seek kill-job depth HcwEtc. parameters, correction calculate default wellhead back pressure
Value Pwd, preset acyclic operating condition wellhead back pressure value Pma, and corrected value is selected manually, and final data is stored in analysis and Control
Device 7；
Operating condition and control operation judges:
①Pd< Psp、Psc> Psp, it is judged as and stops drilling mud pumping source, opens compensation pumping source, can be to make up a joint, remove
Bore or wait and one of three kinds of operating conditions such as stop, operating condition it is uncertain not under the influence of single stepping；
2. comparing Pma> 0, judgement need to compensate wellhead back pressure.
(3) operation is executed, for analyzer-controller 7 according to operating condition and control operation judges, instruction of formulating and implementing realizes that well head returns
Pressure automatically controls；
According to above-mentioned judgement, assign and execute instruction: automatic adjustment throttle valve opening meets compensation pressure and is expected.Such as Pw
≤Pma- PcaWhen, throttle valve opening adjusts small, Pw≥Pma+PcaWhen, throttle valve opening tunes up.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (9)
1. a kind of wellhead back pressure automatic control system, it is characterised in that: sensed including first pressure sensor (1), second pressure
Device (2), third pressure sensor (3), compensation pump (4), throttle valve (5), rotary depth sensor (6) and analyzer-controller (7), first
Pressure sensor (1) connects well head standpipe, and rotary depth sensor (6) is connected in well head by high pressure line, and compensation pump (4) one end connects
It connects second pressure sensor (2), compensation pump (4) other end connects well head entrance by high pressure line, and well head outlet passes through high pressure
Pipeline connects third pressure sensor (3) one end, and third pressure sensor (3) other end connects throttle valve (5)；Analyzer-controller
(7) first pressure sensor (1), second pressure sensor (2), third pressure sensor are separately connected by signal transmssion line
(3), throttle valve (5) and rotary depth sensor (6).
2. wellhead back pressure automatic control system as described in claim 1, it is characterised in that: the analyzer-controller (7) is used to
It obtains data, analysis data and executes operation, analysis data are that the data that will acquire are analyzed, and executing operation is according to analysis
The result of data is executed, and the data that analyzer-controller (7) obtains data include input underlying parameter data and real-time parameter
Data.
3. wellhead back pressure automatic control system as claimed in claim 2, it is characterised in that: the underlying parameter data include stopping
Open pump decision content Psp, default wellhead back pressure value Pwd, preset acyclic operating condition wellhead back pressure value Pma, pressure controling precision Pca, closing well
Seek pressure value Pcw, closing well seek kill-job depth Hcw, property of drilling fluid and discharge capacity, casing programme, drill assembly.
4. wellhead back pressure automatic control system as claimed in claim 3, it is characterised in that: the real-time parameter data pass through the
One pressure sensor (1), second pressure sensor (2), third pressure sensor (3) and rotary depth sensor (6) measure, and described
One pressure sensor (1) is used to survey standpipe pressure Pd, second pressure sensor (2) be used to survey compensation source pressure Psc, third pressure
Sensor (3) is used to survey wellhead back pressure Pw, rotary depth sensor (6) be used to survey real-time well depth Hrt。
5. wellhead back pressure automatic control system as claimed in claim 4, it is characterised in that: the analyzer-controller (7) includes
Automatic control mode and MANUAL CONTROL mode.
6. a kind of wellhead back pressure autocontrol method, characterized by the following steps:
1) data, analyzer-controller (7) input underlying parameter data and real-time parameter data are obtained and are stored；
2) data are analyzed, analyzer-controller (7) carries out the data that step 1) obtains the pressure for realizing judgement operation is calculated
Data, and carry out operating condition and control operation judges；
3) operation is executed, for analyzer-controller (7) according to operating condition and control operation judges, wellhead back pressure is realized in instruction of formulating and implementing
It automatically controls.
7. wellhead back pressure autocontrol method as claimed in claim 6, it is characterised in that: the pressure of step 2) the judgement operation
Force data seeks pressure value P according to closing wellcw, closing well seek kill-job depth Hcw, real-time well depth Hrt, property of drilling fluid and discharge capacity, casing programme,
Drill assembly parameter, to default wellhead back pressure value Pwd, preset acyclic operating condition wellhead back pressure value PmaIt is corrected calculating, and will
Final data is stored in analyzer-controller (7).
8. wellhead back pressure autocontrol method as claimed in claim 7, it is characterised in that: the step 2) operating condition and control behaviour
Work judges are as follows:
If 31) Pd> Psp、Pwd=0, it is drilling condition, does not execute automatic pressure-controlled operation；
If 32) Pd> Psp、Pwd> 0 is drilling condition, executes automatic pressure-controlled operation；
If 33) Pd< Psp、Psc< Psp、Pma=0, stop one of three kinds of operating conditions to make up a joint, making a trip or wait, compensation pump (4) is not held
The operation of row pressure compensation；
If 34) Pd< Psp、Psc< Psp、Pma> 0 stops one of three kinds of operating conditions to make up a joint, making a trip or wait, and compensation pump (4) executes
Pressure compensation operation, this only termination of pumping do not stop situation it is serious when consideration；
If 35) Pd< Psp、Psc> Psp、Pma=0, for continuous grouting trip-out operating condition, compensation pump (4) does not execute pressure compensation operation；
If 36) Pd< Psp、Psc> Psp、Pma> 0, to make up a joint, it is with pressure make a trip or it is with pressure etc. stop one of three kinds of operating conditions, compensate
It pumps (4) and executes pressure compensation operation.
9. wellhead back pressure autocontrol method as claimed in claim 8, it is characterised in that: the step 3) includes following step
It is rapid:
1) if working condition is S31, S33, throttle valve (5) automatic adjustment is full-gear, if P at this timew> 0 will then be controlled automatically
Molding formula switchs to MANUAL CONTROL mode, and early warning；
2) if working condition is S32, throttle valve (5) automatically adjusts aperture state, so that Pwd- Pca≤Pw≤Pwd+Pca；In Pw
≤Pwd- PcaWhen, throttle valve (5) aperture regulation is small, in Pw≥Pwd+PcaWhen, throttle valve (5) aperture tunes up；
3) if working condition is S34, S36, throttle valve (5) automatically adjusts aperture state, so that Pma- Pca≤Pw≤Pma+Pca；
In Pw≤Pma- PcaWhen, throttle valve (5) aperture regulation is small, in Pw≥Pma+PcaWhen, throttle valve (5) aperture tunes up；
4) when working condition is S35, throttle valve (5) automatic adjustment is full-gear, Pw> Pca, automatic control mode is switched into hand
Dynamic control model, and early warning.
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| CN110388189A (en) * | 2019-05-15 | 2019-10-29 | 西南石油大学 | A kind of high temperature high pressure deep well drilling well overflow intelligence throttle well killing method and device |
| CN110630194A (en) * | 2019-10-11 | 2019-12-31 | 中国石油集团渤海钻探工程有限公司 | Pressure control drilling pressure compensation device of energy storage unit formula |
| CN110886589A (en) * | 2019-10-30 | 2020-03-17 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | System and method for preventing slurry leakage of rotary blowout preventer |
| CN111456654A (en) * | 2020-04-30 | 2020-07-28 | 中国石油天然气集团有限公司 | Continuous grouting device and method for tripping |
| CN114482885A (en) * | 2022-01-25 | 2022-05-13 | 西南石油大学 | Pressure-controlled drilling intelligent control system |
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