CN109538144B - Automatic wellhead back pressure control system and method - Google Patents
Automatic wellhead back pressure control system and method Download PDFInfo
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- CN109538144B CN109538144B CN201910002003.1A CN201910002003A CN109538144B CN 109538144 B CN109538144 B CN 109538144B CN 201910002003 A CN201910002003 A CN 201910002003A CN 109538144 B CN109538144 B CN 109538144B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 51
- 238000012937 correction Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 239000009096 changqing Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 1
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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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Abstract
The invention belongs to the technical field of pressure control drilling engineering, and particularly relates to an automatic wellhead back pressure control system and method, wherein the automatic wellhead back pressure control system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor, a compensation pump, a throttle valve, a well depth sensor and an analysis controller; the invention solves the problems that the existing fine pressure control equipment is complex in matching, the pressure control system is complex, the input cost is high, the development strategy of the long-term celebration oil field with low cost is not met, and the later popularization is difficult.
Description
Technical Field
The invention belongs to the technical field of pressure control drilling engineering, and particularly relates to an automatic wellhead back pressure control system and method.
Background
The wellhead pressure-control well drilling has the characteristics of economy, effectiveness and reliability, and has the advantages of less supporting equipment, lower investment cost, strong technical pertinence, capability of effectively reducing well control risks, simple process and strong operability, and can be rapidly popularized in a water injection development area of a Changqing oilfield, thereby realizing safe drilling under different overflow conditions such as overflow water outlet, associated gas, overflow coexistence and the like in the water injection area of the Changqing oilfield. However, the wellhead pressure control drilling operation implemented in the water injection area of the long-distance oilfield is limited to the normal drilling working condition, so that the control of the wellhead back pressure is realized, the wellhead back pressure control during the working conditions of single connection, tripping and the like cannot be met, and the wellhead pressure control drilling in the whole process cannot be realized, which is mainly because the equipment matching is not perfect. Although the existing fine pressure control equipment can meet the pressure control drilling operation requirement of the whole process, the equipment is matched with multiple devices (a back pressure compensation pump, a PWD (pulse wave device), a flow metering system, an automatic throttling manifold, a central control system and the like), the pressure control system is complex (bottom hole pressure monitoring, micro flow monitoring and the like are needed), the input cost is high, the development strategy of low cost of long-term celebration oil fields is not met, and the later popularization is difficult. In order to realize automatic wellhead back pressure control in the whole drilling process on the principle of economy, effectiveness and reliability, and improve the safety operation capability of wellhead pressure control drilling in a water injection area, a low-cost automatic pressure control system research suitable for wellhead pressure control drilling in the water injection area needs to be developed, wherein the wellhead back pressure automatic control method is used as a system research core, is a key for successfully developing a low-cost automatic pressure control system, and is urgently needed to develop targeted research.
Disclosure of Invention
The invention provides an automatic wellhead back pressure control system, which aims at solving the problems that in the wellhead pressure control drilling operation implemented in a water injection area of a long-distance oilfield in the prior art, because equipment matching is not perfect, the control on the size of wellhead back pressure is realized only under normal drilling working conditions, the wellhead back pressure control during working conditions such as single connection, tripping and the like cannot be met, and the wellhead pressure control drilling in the whole process cannot be realized; the second purpose is to overcome the problems that in the prior art, although the existing fine pressure control equipment can meet the pressure control drilling operation requirement of the whole process, the equipment is matched with multiple devices (such as a back pressure compensation pump, a PWD, a flow metering system, an automatic throttling manifold, a central control system and the like), the pressure control system is complex (needs to be monitored by bottom hole pressure, micro flow monitoring and the like), the input cost is high, the development strategy of low cost of long-term oilfield is not met, and the later popularization is difficult.
The invention provides a wellhead back pressure automatic control system, which comprises a first pressure sensor, a second pressure sensor, a third pressure sensor, a compensation pump, a throttle valve, a well depth sensor and an analysis controller, wherein the first pressure sensor is connected with a wellhead vertical pipe; the analysis controller is respectively connected with the first pressure sensor, the second pressure sensor, the third pressure sensor, the throttle valve and the well depth sensor through signal transmission lines.
The analysis controller is used for acquiring data, analyzing the data and executing the operation, wherein the analyzing data is to analyze the acquired data, the executing operation is executed according to the result of the analyzing data, and the data of the acquired data of the analysis controller comprises input basic parameter data and real-time parameter data.
The basic parameter data includes a pump stop determination value P sp Presetting a wellhead back pressure value P wd Presetting a non-circulation working condition wellhead back pressure value P ma Accuracy of pressure control P ca Well closing pressure value P cw Well closing pressure well depth H cw Drilling fluid performance and displacement, well bore structure, and drilling tool assembly.
The real-time parameter data is measured by a first pressure sensor, a second pressure sensor, a third pressure sensor and a well depth sensor, wherein the first pressure sensor is used for measuring the pressure P of the vertical pipe d The second pressure sensor is used for measuring the compensation source pressure P sc The third pressure sensor is used for measuring the wellhead back pressure P w Well depth sensor for measuring real-time well depth H rt 。
The analysis controller includes an automatic control mode and a manual control mode.
An automatic wellhead back pressure control method comprises the following steps:
1) Acquiring data, and inputting basic parameter data and real-time parameter data by an analysis controller and storing the basic parameter data and the real-time parameter data;
2) Analyzing the data, and calculating the data obtained in the step 1) by the analysis controller to obtain pressure data for realizing judgment operation, and judging working conditions and control operation;
3) Executing operation, and determining an executing instruction by the analysis controller according to working conditions and control operation judgment to realize automatic control of wellhead back pressure.
The step 2) judges the pressure data of the operation according to the well shut-in pressure value P cw Well closing pressure well depth H cw Real-time well depth H rt Drilling fluid performance and displacement, well structure and drilling tool assembly parameters, and a wellhead back pressure value P is preset wd Presetting a non-circulation working condition wellhead back pressure value P ma And performing correction calculation and storing the final data in an analysis controller.
The working condition and the control operation in the step 2) are judged as follows:
21 If P d ＞P sp And P is wd If the pressure control valve is in the range of 0, judging the drilling working condition, and not executing automatic pressure control operation;
22 If P d ＞P sp And P is wd If the pressure is more than 0, judging the drilling working condition, and executing automatic pressure control operation;
23 If P d ＜P sp 、P sc ＜P sp And P is ma If the pressure compensation pump is in the range of 0, judging that one of three working conditions of single connection, tripping or waiting is stopped, and the pressure compensation operation is not executed by the compensation pump;
24 If P d ＜P sp 、P sc ＜P sp And P is ma If the pressure is more than 0, judging one of three working conditions of single connection, tripping or waiting for stopping, and executing pressure compensation operation by the compensation pump, wherein the pressure compensation operation is considered only when the condition of stopping the pump and not stopping the flow is serious;
25 If P d ＜P sp 、P sc ＞P sp And P is ma If the pressure compensation pump is in the range of 0, judging that the continuous grouting and drilling working conditions exist, and the pressure compensation operation is not executed by the compensation pump;
26 If P d ＜P sp 、P sc ＞P sp And P is ma And if the pressure is more than 0, judging one of three working conditions of single connection, tripping under pressure or stopping under pressure, and executing pressure compensation operation by the compensation pump.
Said step 3) comprises the steps of:
31 If the working conditions are S21 and S23, the throttle valve is automatically adjusted to be in a fully opened state, and if P is the same w If the value is more than 0, converting the automatic control mode into a manual control mode and early warning;
32 If the operation condition is S22, the throttle valve automatically adjusts the opening state to enable P wd －P ca ≤P w ≤P wd ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P wd －P ca At P, the throttle opening is adjusted to be small w ≥P wd ＋P ca When the throttle valve is opened, the opening degree of the throttle valve is increased;
33 If the working conditions are S24 and S26, the throttle valve automatically adjusts the opening state to enable P ma －P ca ≤P w ≤P ma ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P ma －P ca At P, the throttle opening is adjusted to be small w ≥P ma ＋P ca When the throttle valve is opened, the opening degree of the throttle valve is increased;
34 If the working condition is S25, the throttle valve is automatically adjusted to be in a fully-opened state, P w ＞P ca And converting the automatic control mode into a manual control mode and early warning.
The invention has the beneficial effects that: the automatic wellhead back pressure control system provided by the invention is mainly used for automatically judging the operation working condition, automatically formulating the execution instruction and automatically controlling the opening degree of the throttle valve through inputting, automatically acquiring and calculating and analyzing various parameters, so that the automatic wellhead back pressure control is realized, the whole wellhead pressure control drilling requirement is met, the safety operation capability is improved, the well control risk of a water injection area of a Changqing oilfield is further reduced, and the automatic wellhead pressure control system suitable for wellhead pressure control drilling in the water injection area is developed and the matched process is optimized.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a wellhead pressure control device installation layout;
FIG. 2 wellhead pressure control drilling flow;
FIG. 3 is an automatic control flow for different operating conditions.
Reference numerals illustrate: 1. a first pressure sensor; 2. a second pressure sensor; 3. a third pressure sensor; 4. a compensation pump; 5. a throttle valve; 6. a well depth sensor; 7. and an analysis controller.
Detailed Description
Example 1:
as shown in fig. 1, the wellhead back pressure automatic control system comprises a first pressure sensor 1, a second pressure sensor 2, a third pressure sensor 3, a compensation pump 4, a throttle valve 5, a well depth sensor 6 and an analysis controller 7, wherein the first pressure sensor 1 is connected with a wellhead vertical pipe, the well depth sensor 6 is connected in a wellhead through a high-pressure pipeline, one end of the compensation pump 4 is connected with the second pressure sensor 2, the other end of the compensation pump 4 is connected with a wellhead inlet through a high-pressure pipeline, a wellhead outlet is connected with one end of the third pressure sensor 3 through a high-pressure pipeline, and the other end of the third pressure sensor 3 is connected with the throttle valve 5; the analysis controller 7 is connected with the first pressure sensor 1, the second pressure sensor 2, the third pressure sensor 3, the throttle valve 5 and the well depth sensor 6 through signal transmission lines respectively.
The analysis controller 7 is used for acquiring data, analyzing the acquired data, and executing operations according to the result of the analysis data, wherein the data acquired by the analysis controller 7 comprises input basic parameter data and real-time parameter data.
The basic parameter data includes a pump stop determination value P sp Presetting a wellhead back pressure value P wd Presetting a non-circulation working condition wellhead back pressure value P ma Accuracy of pressure control P ca Well closing pressure value P cw Well closing pressure well depth H cw Drilling fluid performance and displacement, well bore structure, and drilling tool assembly.
The real-time parameter data passes through a first pressure sensor 1, a second pressure sensor 2, a third pressure sensor 3 and a well depth sensor 6The first pressure sensor 1 is used to measure the riser pressure P d The second pressure sensor 2 is used for measuring the compensation source pressure P sc The third pressure sensor 3 is used for measuring wellhead back pressure P w The well depth sensor 6 is used to measure the real-time well depth H rt 。
The analysis controller 7 includes an automatic control mode and a manual control mode.
The automatic wellhead back pressure control system provided by the invention is mainly used for automatically judging the operation working condition, automatically formulating the execution instruction and automatically controlling the opening degree of the throttle valve through inputting, automatically acquiring and calculating and analyzing various parameters, so that the automatic wellhead back pressure control is realized, the whole wellhead pressure control drilling requirement is met, the safety operation capability is improved, the well control risk of a water injection area of a Changqing oilfield is further reduced, and the automatic wellhead pressure control system suitable for wellhead pressure control drilling in the water injection area is developed and the matched process is optimized.
Example 2:
as shown in fig. 2-3, on the basis of embodiment 1, a wellhead back pressure automatic control method includes the following steps:
1) Acquiring data, and inputting basic parameter data and real-time parameter data by the analysis controller 7 and storing the basic parameter data and the real-time parameter data;
2) Analyzing the data, and calculating the data obtained in the step 1) by the analysis controller 7 to obtain pressure data for realizing judgment operation, and judging working conditions and control operation;
3) And executing operation, and determining an executing instruction by the analysis controller 7 according to the working condition and the control operation judgment to realize automatic control of wellhead back pressure.
The step 2) judges the pressure data of the operation according to the well shut-in pressure value P cw Well closing pressure well depth H cw Real-time well depth H rt Drilling fluid performance and displacement, well structure and drilling tool assembly parameters, and a wellhead back pressure value P is preset wd Presetting a non-circulation working condition wellhead back pressure value P ma A correction calculation is performed and the final data is stored in the analysis controller 7. The correction values can be selected automatically or manually, if no correction is performed, the two parameters are used as the originalThe input values and final data are stored in the analysis controller 7.
The working condition and the control operation in the step 2) are judged as follows:
21 If P d ＞P sp And P is wd If the pressure control valve is in the range of 0, judging the drilling working condition, and not executing automatic pressure control operation;
22 If P d ＞P sp And P is wd If the pressure is more than 0, judging the drilling working condition, and executing automatic pressure control operation;
23 If P d ＜P sp 、P sc ＜P sp And P is ma If the pressure compensation pump is in the range of 0, judging that one of three working conditions of single connection, tripping or waiting is stopped, and the pressure compensation operation is not executed by the compensation pump 4;
24 If P d ＜P sp 、P sc ＜P sp And P is ma If the pressure is more than 0, judging one of three working conditions of single connection, tripping or waiting for stopping, wherein the compensation pump 4 executes pressure compensation operation, and the pressure compensation operation is considered only when the condition of stopping the pump and not stopping the flow is serious;
25 If P d ＜P sp 、P sc ＞P sp And P is ma If the pressure compensation pump is not in the pressure compensation operation, the continuous grouting and drilling working conditions are judged;
26 If P d ＜P sp 、P sc ＞P sp And P is ma And if the pressure is more than 0, judging that one of three working conditions of single connection, tripping under pressure or stopping under pressure exists, and executing pressure compensation operation by the compensation pump 4.
Said step 3) comprises the steps of:
31 If the operation conditions are S21 and S23, the throttle valve 5 is automatically adjusted to be in a fully opened state, and if P is the same time w If the value is more than 0, converting the automatic control mode into a manual control mode and early warning;
32 If the operation condition is S22, the throttle valve 5 automatically adjusts the opening state to enable P wd －P ca ≤P w ≤P wd ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P wd －P ca In this case, the throttle valve 5 is small in opening adjustment, and P is w ≥P wd ＋P ca In this case, the opening of the throttle valve 5 is increased；
33 If the operation condition is S24, S26, the throttle valve 5 automatically adjusts the opening state to enable P ma －P ca ≤P w ≤P ma ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P ma －P ca In this case, the throttle valve 5 is small in opening adjustment, and P is w ≥P ma ＋P ca When the throttle valve 5 is opened, the opening is increased;
34 If the working condition is S25, the throttle valve 5 is automatically adjusted to be in a full-open state, P w ＞P ca And converting the automatic control mode into a manual control mode and early warning.
Delta P when the throttle valve automatically adjusts the opening state to control the wellhead pressure w －P wd The larger the adjusting action speed is, the faster the adjusting action speed is, otherwise, the action speed is reduced;
in the automatic mode, the automatic control of wellhead back pressure under different working conditions can be realized by reading, analyzing and executing the data in real time. However, in the manual control mode, if the automatic pressure control is required, the automatic pressure control mode is required to be manually adjusted.
The invention has the beneficial effects that: the invention provides the method for automatically judging and controlling the pressure of the wellhead pressure-controlled drilling system based on the calculation and analysis of the power pump source signal data and the basic data, which is beneficial to developing a low-cost pressure automatic control system suitable for wellhead pressure-controlled drilling in a water injection area and optimizing a matched process. The system based on the method can automatically judge working conditions, automatically formulate execution instructions and automatically control the opening of the throttle valve, realize automatic control of wellhead back pressure, meet the requirement of wellhead pressure control drilling in the whole process of a water injection area, and further reduce the risk of well control of drilling in the water injection area of an oil field.
Example 3:
based on the embodiment 2, the invention takes the automatic judgment and pressure control flow of the system of the wellhead pressure control drilling joint (pressure compensation) working condition as an embodiment.
(1) Acquiring data, and inputting basic parameter data and real-time parameter data by the analysis controller 7 and storing the basic parameter data and the real-time parameter data;
inputting basic data: stop-start pump determination value P sp Presetting a wellhead back pressure value P wd Presetting a non-circulation working condition wellhead back pressure value P ma Accuracy of pressure control P ca Well closing pressure value P cw Well closing pressure well depth H cw Drilling fluid performance and displacement, well bore structure, and drilling tool assembly;
reading sensor data: riser pressure P d Compensating source pressure P sc Wellhead back pressure P w Real-time well depth H rt ；
(2) Analyzing the data, and calculating the data obtained in the step 1) by the analysis controller 7 to obtain pressure data for realizing judgment operation, and judging working conditions and control operation;
data correction: according to the shut-in pressure value P cw Well closing pressure well depth H cw Equal parameters, correcting and calculating a preset wellhead back pressure value P wd Presetting a non-circulation working condition wellhead back pressure value P ma And manually selecting the correction value and storing the final data in the analysis controller 7;
judging working conditions and control operations:
① P d ＜P sp 、P sc ＞P sp judging that the drilling mud pump source is stopped, starting the compensation pump source, wherein the drilling mud pump source can be one of three working conditions of single connection, starting and tripping or waiting and stopping, and the next operation is not influenced by the uncertainty of the working conditions;
(2) comparison P ma And (3) judging that the wellhead back pressure needs to be compensated according to the value of more than 0.
(3) Executing operation, wherein the analysis controller 7 makes an executing instruction according to the working condition and the control operation judgment, and realizes automatic control of wellhead back pressure;
according to the judgment, issuing an execution instruction: and automatically adjusting the opening of the throttle valve to ensure that the compensation pressure meets the expected requirement. Such as P w ≤P ma －P ca When the throttle valve opening is adjusted to be small, P w ≥P ma ＋P ca And when the throttle valve is opened, the opening degree of the throttle valve is increased.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (5)
1. A control method of an automatic wellhead back pressure control system is characterized by comprising the following steps of: the method comprises the following steps:
1) Acquiring data, inputting basic parameter data and real-time parameter data by an analysis controller (7) and storing the basic parameter data and the real-time parameter data; the basic parameter data includes a pump stop determination value P sp Presetting a wellhead back pressure value P wd Presetting a non-circulation working condition wellhead back pressure value P ma Accuracy of pressure control P ca Well closing pressure value P cw Well closing pressure well depth H cw Drilling fluid performance and displacement, well bore structure, and drilling tool assembly; the real-time parameter data are measured by a first pressure sensor (1), a second pressure sensor (2), a third pressure sensor (3) and a well depth sensor (6), and the first pressure sensor (1) is used for measuring the pressure P of a vertical pipe d The second pressure sensor (2) is used for measuring the compensation source pressure P sc The third pressure sensor (3) is used for measuring the wellhead back pressure P w The well depth sensor (6) is used for measuring the real-time well depth H rt
2) Analyzing the data, and calculating the data obtained in the step 1) by an analysis controller (7) to obtain pressure data for realizing judgment operation, and judging working conditions and control operation; the working condition and the control operation are judged as follows:
21 If P d ＞P sp And P is wd If the pressure control valve is in the range of 0, judging the drilling working condition, and not executing automatic pressure control operation;
22 If P d ＞P sp And P is wd If the pressure is more than 0, judging the drilling working condition, and executing automatic pressure control operation;
23 If P d ＜P sp 、P sc ＜P sp And P is ma If the pressure compensation pump is in the range of 0, judging that one of three working conditions of single connection, tripping or waiting is met, and the compensation pump (4) does not execute pressure compensation operation;
24 If P d ＜P sp 、P sc ＜P sp And P is ma If more than 0, judging one of three working conditions of single connection, tripping or waiting for drilling, supplementingCompensating the pump (4) to perform a pressure compensation operation, which is only considered when the condition of stopping the pump is serious;
25 If P d ＜P sp 、P sc ＞P sp And P is ma If the pressure compensation pump is in the range of 0, judging that the continuous grouting and drilling working conditions exist, and the pressure compensation operation is not executed by the compensation pump (4);
26 If P d ＜P sp 、P sc ＞P sp And P is ma If the pressure is more than 0, judging that one of three working conditions of single connection, tripping under pressure or stopping under pressure is adopted, and executing pressure compensation operation by the compensation pump (4);
wherein P is d For riser pressure, P sp For stopping and starting the pump to judge value, P wd For presetting the wellhead back pressure value, P sc To compensate for source pressure;
3) Executing operation, determining an executing instruction by the analysis controller (7) according to working conditions and control operation judgment, and realizing automatic control of wellhead back pressure, wherein the method specifically comprises the following steps:
31 If the working conditions are S21 and S23, the throttle valve (5) is automatically adjusted to be in a fully opened state, and if P is the same w If the value is more than 0, converting the automatic control mode into a manual control mode and early warning;
32 If the working condition is S22, the throttle valve (5) automatically adjusts the opening state to enable P wd －P ca ≤P w ≤P wd ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P wd －P ca In the case of P, the opening degree of the throttle valve (5) is adjusted to be small w ≥P wd ＋P ca When the throttle valve (5) is opened, the opening is increased;
33 If the working conditions are S24 and S26, the throttle valve (5) automatically adjusts the opening state to enable P ma －P ca ≤P w ≤P ma ＋P ca The method comprises the steps of carrying out a first treatment on the surface of the At P w ≤P ma －P ca In the case of P, the opening degree of the throttle valve (5) is adjusted to be small w ≥P ma ＋P ca When the throttle valve (5) is opened, the opening is increased;
34 When the working condition is S25, the throttle valve (5) is automatically adjusted to be in a full-open state, P w ＞P ca Will automatically controlThe control mode is changed into a manual control mode, and early warning is carried out.
2. The control method of the wellhead back pressure automatic control system as claimed in claim 1, wherein: the step 2) judges the pressure data of the operation according to the well shut-in pressure value P cw Well closing pressure well depth H cw Real-time well depth H rt Drilling fluid performance and displacement, well structure and drilling tool assembly parameters, and a wellhead back pressure value P is preset wd Presetting a non-circulation working condition wellhead back pressure value P ma Correction calculations are performed and the final data is stored in an analysis controller (7).
3. The control method of the wellhead back pressure automatic control system as claimed in claim 1, wherein: the automatic wellhead back pressure control system comprises a first pressure sensor (1), a second pressure sensor (2), a third pressure sensor (3), a compensation pump (4), a throttle valve (5), a well depth sensor (6) and an analysis controller (7), wherein the first pressure sensor (1) is connected with a wellhead vertical pipe, the well depth sensor (6) is connected in a wellhead through a high-pressure pipeline, one end of the compensation pump (4) is connected with the second pressure sensor (2), the other end of the compensation pump (4) is connected with a wellhead inlet through the high-pressure pipeline, a wellhead outlet is connected with one end of the third pressure sensor (3) through the high-pressure pipeline, and the other end of the third pressure sensor (3) is connected with the throttle valve (5); the analysis controller (7) is respectively connected with the first pressure sensor (1), the second pressure sensor (2), the third pressure sensor (3), the throttle valve (5) and the well depth sensor (6) through signal transmission lines.
4. A control method of an automatic wellhead back pressure control system as claimed in claim 3, wherein: the analysis controller (7) is used for acquiring data, analyzing the acquired data and executing operation according to the result of the analysis data, wherein the data acquired by the analysis controller (7) comprises input basic parameter data and real-time parameter data.
5. A control method of an automatic wellhead back pressure control system as claimed in claim 3, wherein: the analysis controller (7) includes an automatic control mode and a manual control mode.
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| CN110630194B (en) * | 2019-10-11 | 2021-09-28 | 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 |
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