CN110863787A - Experimental device for double-gradient drilling technology detection and control system - Google Patents
Experimental device for double-gradient drilling technology detection and control system Download PDFInfo
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- CN110863787A CN110863787A CN201911076606.2A CN201911076606A CN110863787A CN 110863787 A CN110863787 A CN 110863787A CN 201911076606 A CN201911076606 A CN 201911076606A CN 110863787 A CN110863787 A CN 110863787A
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- mud
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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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- 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
- E21B47/00—Survey of boreholes or wells
Abstract
An experimental device of a double-gradient drilling technology detection and control system comprises a mud tank, a mud pump, a mud input pipeline, a suction module, a mud lifting pump, a mud return pipeline and a PLC control system; the mud tank is provided with a liquid outlet and a liquid return port, and the liquid outlet is connected with an input port of the mud pump; the output port of the mud pump is connected with the mud inlet of the suction module through a mud input pipeline; the suction module is also provided with a slurry outlet which is connected with an input port of the slurry lifting pump; the output port of the slurry lifting pump is communicated with the liquid return port of the slurry tank through a slurry return pipeline; the PLC control system comprises a sensor and a processor, wherein the output end of the sensor is connected with the input end of the processor, and the output end of the processor is connected with a mud pump and a mud lifting pump controller. The invention provides an experimental platform for a key detection and control system of the dual-gradient drilling and provides technical support for the domestic popularization and application of the marine riser-free drilling technology.
Description
Technical Field
The invention relates to an experimental device, in particular to an experimental device for a detection and control system of a dual-gradient drilling technology, and belongs to the technical field of marine drilling equipment.
Background
With the development of socio-economy, the demand of human beings on petroleum and natural gas is increasing day by day, but as land oil fields are continuously consumed and aged at present, the exploration and development of oil and gas resources are gradually advancing to the ocean. The operation environment of marine drilling, especially deep sea drilling, is more complex and harsh than land drilling, and the outstanding problem is that the gap between the pore pressure and the fracture pressure of the stratum is very small due to the existence of seawater, so that the pressure in the shaft is difficult to control in a safe density window.
Dual gradient drilling is a pressure-controlled drilling technique that uses two or more pressure gradients to control the wellbore pressure profile. The dual-gradient drilling mode can be realized in many ways, such as a drilling fluid lifting mode by a subsea pump, a drilling mode without a marine riser, a dual-density drilling mode and the like. The working principle of the marine riser-free drilling mode is that a subsea pump is put in, and mud which returns to a wellhead upwards is lifted by the subsea pump and returns to a drilling platform; meanwhile, the discharge capacity of the subsea pump is controlled in real time, so that the pressure of a wellhead is always equal to the pressure of seawater outside the same horizontal plane, and the purpose of dual-gradient drilling is achieved. Although the existing non-riser drilling technology is put into commercial application abroad and obtains good economic effect, the non-riser drilling technology is still in theoretical research and indoor test stages in China due to the blockade of the foreign technology, so that an experimental device is not required to be designed by combining the non-riser drilling principle, and an experimental platform is provided for a key detection and control system of dual-gradient drilling.
Disclosure of Invention
The invention provides an experimental device of a detection and control system of a dual-gradient drilling technology, aiming at providing an experimental platform for the pressure detection and control technology of dual-gradient drilling by simulating a drilling process without a marine riser.
In order to achieve the purpose, the invention adopts the following technical scheme:
an experimental device of a double-gradient drilling technology detection and control system comprises a mud tank, a mud pump, a mud input pipeline, a suction module, a mud lifting pump, a mud return pipeline and a PLC control system; the mud tank is provided with a liquid outlet and a liquid return port, wherein the liquid outlet is connected with an input port of the mud pump; the output port of the mud pump is connected with the mud inlet of the suction module through a mud input pipeline; the suction module is also provided with a slurry outlet which is connected with an input port of the slurry lifting pump; the output port of the slurry lifting pump is communicated with the liquid return port of the slurry tank through a slurry return pipeline; the mud pump and the mud lifting pump are both driven by a variable frequency motor; the PLC control system comprises a group of sensors and a processor, wherein the output ends of the sensors are connected with the input end of the processor, and the output end of the processor is connected with a mud pump and a variable frequency motor controller of a mud lifting pump.
In the experimental device for the dual-gradient drilling technology detection and control system, the suction module is also provided with a base and a sealing cover; the base is fixed on the horizontal ground, a sealing cover is assembled at the top of the suction module, the slurry inlet is arranged at the bottom of the suction module, the slurry outlet is arranged on the side wall of the suction module, and a sealing gasket is arranged at the joint part of the suction module and the sealing cover; and the sealing cover is provided with a deflation valve.
According to the experimental device for the double-gradient drilling technology detection and control system, the one-way valve is arranged at the slurry inlet of the suction module, and the valve proportion actuator is arranged at the slurry outlet of the suction module.
According to the experimental device for the double-gradient drilling technology detection and control system, flow valves are arranged at the liquid outlet and the liquid return port of the mud tank.
According to the experimental device of the dual-gradient drilling technology detection and control system, the mud input pipeline and the mud return pipeline are respectively provided with a flowmeter.
According to the experimental device for the dual-gradient drilling technology detection and control system, the pressure reducing valve is arranged on the mud returning pipeline.
According to the experimental device for the dual-gradient drilling technology detection and control system, the sensors in the PLC control system comprise pressure sensors arranged on two sides of a pressure reducing valve in a slurry input pipeline and a slurry return pipeline and an internal and external differential pressure sensor arranged on the side wall of the suction module, and collected pressure information in the slurry input pipeline and the slurry return pipeline and internal and external differential pressure information of the suction module are transmitted to the processor through the sensors.
According to the experimental device for the dual-gradient drilling technology detection and control system, the stirrer is arranged in the mud tank, and the stirrer is an electric stirrer.
The invention relates to an experimental device for a double-gradient drilling technology detection and control system, which is provided with a mud tank, a mud pump, a mud input pipeline, a suction module, a mud lifting pump and a mud return pipeline, wherein the process that mud returning to a wellhead upwards is lifted and returned by a subsea pump during drilling operation without a marine riser is simulated through the cooperation of the mud tank, the mud pump, the mud input pipeline, the suction module, the mud lifting pump and the mud return pipeline; the mud pump and the mud lifting pump are designed to be in a variable frequency motor driving mode, the sensors are arranged on the mud input pipeline, the mud return pipeline and the side wall of the barrel body of the suction module, and different types of control valves are arranged at the positions of the mud input pipeline, the mud return pipeline, a liquid inlet and outlet of the mud tank, a liquid inlet and outlet of the suction module and the like, so that a processor in the PLC control system can send action instructions to the control valves, the mud pump and the mud lifting pump according to information collected by the sensors, and the flow of the mud pump and the mud lifting pump under different working conditions is controlled. Therefore, the invention provides an experimental platform for a key detection and control system of the dual-gradient drilling and provides technical support for the domestic popularization and application of the marine riser-free drilling technology.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the suction module construction;
FIG. 3 is an enlarged view of the structure of FIG. 2 at I;
fig. 4 is a view from direction K of fig. 2.
The list of labels in the figure is:
1. a mud tank; 2. a stirrer; 3. a flow valve; 4. a slurry pump; 5. a slurry input line; 6. a one-way valve; 7. an internal and external differential pressure sensor; 8. the device comprises a suction module, 8-1, a sealing cover, 8-2, a sealing gasket, 8-3 of a pulp outlet, 8-4 of a base, 8-5 of a pulp inlet; 9. a valve proportional actuator; 10. a mud lift pump; 11. A processor; 12. a slurry return line; 13. a flow meter 1; 14. a pressure sensor; 15. a deflation valve; 16. a pressure reducing valve.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Referring to fig. 1 and 2, the invention relates to an experimental device of a dual-gradient drilling technology detection and control system, which comprises a mud tank 1, a mud pump 4, a mud input pipeline 5, an intake module 8, a mud lifting pump 10, a mud return pipeline 12 and a PLC control system; the mud tank 1 is provided with a liquid outlet and a liquid return port, wherein the liquid outlet is connected with an input port of the mud pump 4; the output port of the mud pump 4 is connected with a mud inlet 8-5 of the suction module 8 through a mud input pipeline 5; the suction module 8 is also provided with a slurry outlet 8-3, and the slurry outlet 8-3 is connected with an input port of a slurry lifting pump 10; the output port of the mud lifting pump 10 is communicated with the liquid return port of the mud tank 1 through a mud return pipeline 12; the mud pump 4 and the mud lifting pump 10 are both driven by variable frequency motors; the PLC control system comprises a group of sensors and a processor 11, the sensors comprise pressure sensors 14 arranged in a slurry input pipeline 5 and a slurry return pipeline 12 and internal and external pressure difference sensors 7 arranged on the side wall of a suction module 8, the output ends of the sensors are connected with the input end of the processor 11, collected pressure information in the slurry input pipeline 5 and the slurry return pipeline 12 and internal and external pressure difference information of the suction module 8 are transmitted to the processor 11 through the sensors, and the output end of the processor 11 is connected with a variable frequency motor controller of a slurry pump 4 and a slurry lifting pump 10.
Referring to fig. 2, 3 and 4, in the experimental device of the dual-gradient drilling technology detection and control system of the present invention, the suction module 8 is further provided with a base 8-4 and a sealing cover 8-1; the base 8-4 is fixed on the horizontal ground, the top of the suction module 8 is provided with the sealing cover 8-1, the pulp inlet 8-5 is arranged at the bottom of the suction module 8, the pulp outlet 8-3 is arranged on the side wall of the suction module 8, and the joint part of the suction module 8 and the sealing cover 8-1 is provided with the sealing gasket 8-2; and the sealing cover 8-1 is provided with a deflation valve 15.
Referring to fig. 1, the experimental apparatus for the dual-gradient drilling technology detection and control system according to the present invention comprises a mud tank 1, a stirrer 2 driven by a motor is disposed in the mud tank 1, the stirrer 2 can continuously stir to prevent mud from settling, a flow valve 3 is disposed at a liquid outlet of the mud tank 1 for preventing mud from flowing back when a mud pump is not in operation, and a flow valve 3 is also disposed at a liquid return port of the mud tank 1 for preventing siphon from flowing back when the pump is stopped; the invention sets up the check valve 6 in the thick liquid inlet 8-5 of the suction module 8, the check valve 6 is used for preventing the mud in the suction module from flowing backwards, set up the proportional actuator 9 of the valve in the thick liquid outlet 8-3 of the suction module 8, the proportional actuator 9 of the valve is used for controlling the opening and closing of the mud return line 12, cooperate with mud lift pump 10 to control the suction module 8 internal pressure at the same time, there is air release valve 15 on the gland bonnet 8-1 of the suction module 8, is used for the mud to discharge the gas from the top when filling into the suction module 8; the invention is provided with flowmeters 13 on a mud input pipeline 5 and a mud return pipeline 12, which are used for recording the flow of a mud pump 4 and a mud lifting pump 10; the invention provides a pressure relief valve 16 on the mud return line 12 for increasing the lift pump load and verifying the head of the mud lift pump 10.
Referring to fig. 1, the experimental device for the dual-gradient drilling technology detection and control system is mainly used for testing the functionality and stability of the dual-gradient drilling detection and control system, and can detect the outlet pressure of a mud pump 4, the outlet flow of the mud pump 4, the difference value of the internal pressure and the external pressure of a suction module 8, the outlet pressure of a mud lifting pump 10, the outlet flow of the mud lifting pump 10 and the outlet pressure of a pressure reducing valve 16. When the experimental device of the double-gradient drilling technology detection and control system is adopted for carrying out experiments, the specific operation steps are as follows: firstly, preparing slurry in a slurry tank 1, opening a flow valve 3 at a liquid outlet and a liquid return port of the slurry tank 1, and an air release valve 15 on a sealing cover 8-1 of a suction module 8, and closing a valve proportion actuator 9 at a slurry outlet 8-3 of the suction module 8; then, the slurry pump 4 is started, at the moment, slurry enters the suction module 8 through the slurry input pipeline 5, and gas in the suction module 8 is discharged through the air release valve 15; when the suction module 8 is filled with the slurry, the air release valve 15 is closed, and the pressure in the suction module begins to rise at the moment; when the internal and external pressure difference sensor 7 detects that the pressure difference reaches a preset value, the valve proportion actuator 9 and the slurry lifting pump 10 are started, and slurry returns to the slurry tank 1 through the slurry return pipeline 12, so that the slurry circulation is completed.
Referring to fig. 1, in the above experiment process, the PLC control system can control the opening of the valve proportional actuator 9 and the displacement of the mud lift pump 10 in real time, so that the pressure in the suction module 8 is always maintained at a preset value, so as to simulate the working conditions of the dual-gradient drilling wellhead, for example: when a drilling working condition without a marine riser is simulated, the discharge capacity of the mud lifting pump needs to be controlled constantly to ensure that the internal pressure of the suction module is equal to the external seawater pressure, the control system can detect the internal and external pressure difference of the suction module 8 through the internal and external pressure difference sensor 7 of the suction module 8, and when the pressure difference value is larger than the preset value of the control system, the control system can increase the discharge capacity of the mud lifting pump 10 and the opening degree of the valve proportional actuator 9 to reduce the internal and external pressure difference value of the suction module 8; when the pressure difference is smaller than the preset value of the control system, the control system reduces the displacement of the mud lifting pump 10 and the opening degree of the valve proportional actuator 9 so as to increase the difference between the internal pressure and the external pressure of the suction module. Meanwhile, the system compares the outlet pressure and flow values of the slurry pump and the slurry lifting pump 10, quickly adjusts the discharge capacity of the slurry lifting pump 10 and the opening degree of the valve proportional actuator 9 to be close to proper values through a preset algorithm, and then carries out accurate fine adjustment.
Referring to fig. 1, the experimental device of the dual-gradient drilling technology detection and control system can simulate normal drilling working conditions and special working conditions such as well kick and well leakage. When the experimental device simulates the well kick working condition, the flow of the mud pump 4 can be manually adjusted in advance, the pressure in the suction module 8 is increased, the control system detects that the pressure difference between the inside and the outside of the suction module 8 is increased, the discharge capacity of the mud lifting pump 10 and the opening of the valve proportion actuator 9 can be automatically increased, and the difference between the inside and the outside of the suction module 8 is reduced. When the drilling well leaks, the bottom pressure is greater than the stratum pressure, mud enters the stratum, and upward mud return is reduced, and when the experimental device simulates the working condition of the well leakage, the flow of the mud pump 4 can be reduced through manual intervention, at the moment, the pressure in the suction module 8 is reduced, the control system detects that the pressure difference value inside and outside the suction module 8 is reduced, and the discharge capacity of the mud lifting pump 10 and the opening degree of the valve proportion actuator 9 can be automatically reduced so as to increase the pressure difference value inside and outside the suction module 8.
Referring to fig. 1, the experimental apparatus for a dual gradient drilling technology detection and control system according to the present invention can also verify the lifting capability of the mud lift pump 10, and can verify the lifting head capability of the mud lift pump 10 by adjusting the pressure reducing valve 16 to increase the working load for the mud lift pump 10.
Claims (8)
1. A double-gradient drilling technology detection and control system experimental device is characterized by comprising a mud tank (1), a mud pump (4), a mud input pipeline (5), a suction module (8), a mud lifting pump (10), a mud return pipeline (12) and a PLC control system; the mud tank (1) is provided with a liquid outlet and a liquid return port, wherein the liquid outlet is connected with an input port of the mud pump (4); the output port of the mud pump (4) is connected with a mud inlet (8-5) of the suction module (8) through a mud input pipeline (5); the suction module (8) is also provided with a slurry outlet (8-3), and the slurry outlet (8-3) is connected with an input port of a slurry lifting pump (10); the output port of the mud lifting pump (10) is communicated with a liquid return port of the mud tank (1) through a mud return pipeline (12); the mud pump (4) and the mud lifting pump (10) are driven by a variable frequency motor; the PLC control system comprises a group of sensors and a processor (11), the output ends of the sensors are connected with the input end of the processor (11), and the output end of the processor (11) is connected with a mud pump (4) and a variable frequency motor controller of a mud lifting pump (10).
2. The dual gradient drilling technology detection and control system experimental apparatus of claim 1, wherein the suction module (8) is further provided with a base (8-4) and a sealing cover (8-1); the base (8-4) is fixed on the horizontal ground, a sealing cover (8-1) is assembled at the top of the suction module (8), the pulp inlet (8-5) is arranged at the bottom of the suction module (8), the pulp outlet (8-3) is arranged on the side wall of the suction module (8), and a sealing gasket (8-2) is arranged at the joint part of the suction module (8) and the sealing cover (8-1); and the sealing cover (8-1) is provided with an air release valve (15).
3. The dual gradient drilling technology detection and control system experimental apparatus as claimed in claim 2, wherein a one-way valve (6) is arranged at a slurry inlet (8-5) of the suction module (8), and a valve proportion actuator (9) is arranged at a slurry outlet (8-3) of the suction module (8).
4. The experimental device of the dual-gradient drilling technology detection and control system as claimed in claim 3, wherein flow valves (3) are arranged at the liquid outlet and the liquid return port of the mud tank (1).
5. The dual gradient drilling technology detection and control system experimental apparatus of claim 4, wherein flow meters (13) are arranged on the mud input pipeline (5) and the mud return pipeline (12).
6. The dual gradient drilling technology test and control system experimental setup of claim 5, characterized in that a pressure relief valve (16) is provided on the mud return line (12).
7. The dual gradient drilling technology detection and control system experimental device as claimed in any one of claims 1 to 6, wherein the sensors in the PLC control system comprise pressure sensors (14) arranged at two sides of a pressure reducing valve in the slurry input pipeline (5) and the slurry return pipeline (12), and internal and external differential pressure sensors (7) arranged on the side wall of the suction module (8), and the acquired pressure information in the slurry input pipeline (5), the slurry return pipeline (12) and the internal and external differential pressure information of the suction module (8) are transmitted to the processor (11) through the sensors.
8. The dual gradient drilling technology detection and control system experimental apparatus of claim 7, wherein a stirrer (2) is arranged in the mud tank (1), and the stirrer (2) is an electric stirrer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911076606.2A CN110863787A (en) | 2019-11-06 | 2019-11-06 | Experimental device for double-gradient drilling technology detection and control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911076606.2A CN110863787A (en) | 2019-11-06 | 2019-11-06 | Experimental device for double-gradient drilling technology detection and control system |
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| Publication Number | Publication Date |
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| CN110863787A true CN110863787A (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911076606.2A Pending CN110863787A (en) | 2019-11-06 | 2019-11-06 | Experimental device for double-gradient drilling technology detection and control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586036A (en) * | 2021-09-09 | 2021-11-02 | 中国石油大学(华东) | Underground overflow type and invasion well kick early monitoring device and method based on double-density measurement |
-
2019
- 2019-11-06 CN CN201911076606.2A patent/CN110863787A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586036A (en) * | 2021-09-09 | 2021-11-02 | 中国石油大学(华东) | Underground overflow type and invasion well kick early monitoring device and method based on double-density measurement |
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