Downhole liquid-gas pressure control system for well drilling

Abstract

The utility model relates to the technical field of well drilling hydraulic control, and discloses a well drilling underground hydraulic-pneumatic pressure control system which comprises a power module, a first hydraulic control module, a second hydraulic control module and an electric control module. The output end of the power module is connected with a hydraulic main path, the hydraulic main path is provided with a throttling pipeline and a well killing pipeline, and hydraulic flat valves are arranged on parallel branches of the well killing pipeline; hydraulic throttle valves are arranged on parallel branches of the throttle pipeline; the electric control module comprises a PLC control unit, and the PLC control unit is electrically connected with the power module, the electromagnetic valve, the proportional electromagnetic valve and an underground first pressure sensor. The downhole pressure control device has the advantages that the downhole actual pressure value can be monitored, the downhole pressure is controlled by adjusting the hydraulic throttle valve, the working pressure of downhole liquid and gas is adjusted by controlling the on-site pump set, the downhole actual pressure value is adjusted to be within the safe pressure value range all the time, and the drilling efficiency and safety are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling hydraulic control, in particular to a downhole liquid-gas pressure control system for drilling. Background Technique

[0002] In traditional oil and gas exploration drilling methods, in order to provide a relatively stable pressure value for drilling, generally, a field pump unit is used to transport drilling fluid into the well to ensure the stability of the drilling pressure. In complex formations, the formation pressure may vary greatly. When encountering abnormal downhole pressure, it is impossible to adjust the working pressure value of the field pump unit according to the actual downhole pressure value. Often, it is necessary to stop work for treatment, and the daily drilling cost is high, which will lead to an increase in time and cost, and the drilling efficiency is low. If not handled properly, it will also cause the most dangerous accidents in the drilling process, such as serious blowouts and well leaks, which may cause unimaginable losses and environmental pollution. Content of the Utility Model

[0003] The purpose of the utility model is to provide a downhole liquid-gas pressure control system for drilling, which can monitor the actual downhole pressure value, adjust the downhole pressure, accelerate or slow down the release of the downhole pressure through a hydraulic throttle valve, accelerate or slow down the transportation of downhole drilling fluid through a field pump unit, and adjust the actual downhole pressure value to always be within the safe pressure value range, improving the drilling efficiency and safety.

[0004] In order to achieve the above purpose, the utility model provides a downhole liquid-gas pressure control system for drilling. The downhole liquid-gas is used to adjust the downhole pressure. The pressure control system includes a power module, a first hydraulic control module, a second hydraulic control module, and an electric control module;

[0005] The output end of the power module is connected with a main hydraulic circuit. The main hydraulic circuit is provided with a throttle pipeline and a kill pipeline for adjusting the working pressure of the downhole liquid-gas. Hydraulic flat valves are arranged on the parallel branches of the kill pipeline. The first hydraulic control module is arranged at the input end of each hydraulic flat valve. The first hydraulic control module includes a solenoid valve and a first manual reversing valve arranged in parallel;

[0006] Hydraulic throttle valves are arranged on the parallel branches of the throttle pipeline. The second hydraulic control module is arranged at the input end of each hydraulic throttle valve. The second hydraulic control module includes a proportional solenoid valve and a second manual reversing valve arranged in parallel;

[0007] The electric control module includes a PLC control unit. The PLC control unit is electrically connected with the power module, the solenoid valve, the proportional solenoid valve, and a first pressure sensor downhole.

[0008] Furthermore, the first hydraulic control module further includes two first one-way throttle valves arranged in parallel, and the two first one-way throttle valves are respectively communicated with the solenoid valve and the output end of the first manual reversing valve.

[0009] Furthermore, the second hydraulic control module further includes two second one-way throttle valves arranged in parallel, and the two second one-way throttle valves are respectively communicated with the proportional solenoid valve and the output end of the second manual reversing valve.

[0010] Furthermore, the power module includes a liquid tank, a filter, an electric pump, a pneumatic pump, a manual pump, and an accumulator connected by a first pipeline, and the electric pump, the pneumatic pump, the manual pump, and the accumulator are arranged in parallel.

[0011] Furthermore, a hydraulic sensor, a safety valve, and a pressure relief valve are further arranged on the first pipeline, and the safety valve and the pressure relief valve are in parallel and are both communicated with the liquid tank.

[0012] Furthermore, a pressure regulating valve is arranged at the output end of the first pipeline, and the output end of the pressure regulating valve is communicated with the input end of the hydraulic main circuit.

[0013] Furthermore, the first hydraulic control module further includes a proximity switch for sensing the switch state of the hydraulic flat valve, and the second hydraulic control module further includes a displacement sensor for sensing the opening state of the hydraulic throttle valve. The proximity switch and the displacement sensor are both electrically connected to the PLC control unit.

[0014] Furthermore, the electric control module further includes an industrial computer, a host computer, and a slave computer, and the PLC control unit is also electrically connected to the blowout preventer at the wellhead.

[0015] Compared with the prior art, the beneficial effects of the downhole liquid-gas pressure control system for drilling in the embodiment of the present utility model are as follows: The pressure control system includes a power module, a first hydraulic control module, a second hydraulic control module, and an electric control module; the PLC control unit is electrically connected to the power module, solenoid valves, proportional solenoid valves, and the first pressure sensor downhole. The PLC control unit collects the actual pressure value downhole measured by the first pressure sensor, compares it with the range of the downhole safety pressure value set by the PLC control unit, controls the opening and closing of the hydraulic flat valve through the first hydraulic control module and controls the associated on-site pump set to speed up or slow down the delivery of the downhole drilling fluid, and controls the opening of the throttle valve through the second hydraulic control module to speed up or slow down the release of the downhole pressure, so as to adjust the actual pressure value downhole to always be within the safety pressure value range, improving the drilling efficiency and safety. In addition, the first hydraulic control module includes a solenoid valve and a first manual reversing valve arranged in parallel; the second hydraulic control module includes a proportional solenoid valve and a second manual reversing valve arranged in parallel, and the hydraulic flat valve and the hydraulic throttle valve can be controlled manually or automatically respectively, improving the stability of system control. Brief Description of the Drawings

[0016] Figure 1 It is the schematic diagram of the downhole liquid-gas pressure control system for drilling in the embodiment of the present utility model.

[0017] In the figure, 1. Power module; 11. First pipeline; 111. Hydraulic inductor; 112. Pressure switch; 113. Safety valve; 114. Pressure relief valve; 12. Liquid tank; 13. Filter; 14. Electric pump; 15. Pneumatic pump; 16. Manual pump; 17. Accumulator; 18. Pressure regulating valve; 2. First hydraulic control module; 21. Solenoid valve; 22. First manual reversing valve; 23. First one-way throttle valve; 24. Proximity switch; 3. Second hydraulic control module; 31. Proportional solenoid valve; 32. Second manual reversing valve; 33. Second one-way throttle valve; 34. Displacement sensor; 4. Electric control module; 41. PLC control unit; 42. Industrial control computer; 43. Host computer; 44. Slave computer; 5. Hydraulic main circuit 5; 51. Throttle pipeline; 52. Killing well pipeline; 6. Hydraulic flat valve; 7. Hydraulic throttle valve. Detailed Embodiments

[0018] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc. in the present utility model is based on the positional relationship shown in the drawings. These terms are only used for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0020] In the description of the present utility model, it should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0021] As Figure 1 shown, a downhole liquid-gas pressure control system for a drilling rig in a preferred embodiment of the present utility model is used to adjust the downhole pressure. This pressure control system is used to adjust the hydraulic working pressure for driving the downhole liquid-gas operation, specifically by controlling the on-site pump set to speed up or slow down the delivery of downhole drilling fluid. It includes a power module 1, a first hydraulic control module 2, a second hydraulic control module 3, and an electric control module 4. Among them, the output end of the power module 1 is connected to a main hydraulic line 5, that is, the output end of the power module 1 is connected to the input end of the main hydraulic line 5, and the output end of the main hydraulic line 5 is connected to the hydraulic control module. The hydraulic output is used to control the opening and closing of the hydraulic flat valve 6 or the opening degree of the hydraulic throttle valve 7, thereby adjusting the working pressure of the downhole liquid-gas. Specifically, the main hydraulic line 5 is provided with a throttle line 51 and a kill line 52 for adjusting the working pressure of the downhole liquid-gas. The throttle line 51 and the kill line 52 can be arranged in parallel, and they are set accordingly according to the actual pressure adjustment requirements. Among them, hydraulic flat valves 6 are provided on the parallel branches of the kill line 52. To facilitate the control of the opening and closing of the hydraulic flat valve 6, a first hydraulic control module 2 is provided at the input end of each hydraulic flat valve 6. The first hydraulic control module 2 includes a solenoid valve 21 and a first manual reversing valve 22 arranged in parallel, and the opening and closing of the hydraulic flat valve 6 can be adjusted through two methods: manual and automatic control, making the system stable and reliable. Similarly, hydraulic throttle valves 7 are provided on the parallel branches of the throttle line 51, and a second hydraulic control module 3 is provided at the input end of each hydraulic throttle valve 7. The second hydraulic control module 3 includes a proportional solenoid valve 31 and a second manual reversing valve 32 arranged in parallel.

[0022] For the convenience of designing the electric control system, further, the electric control module 4 includes a PLC control unit 41. The PLC control unit 41 is electrically connected to the power module 1, the solenoid valve 21, the proportional solenoid valve 31, and the first pressure sensor downhole. Specifically, the PLC control unit 41 is used to collect the actual downhole pressure value measured by the first pressure sensor, compare it with the range of the downhole safety pressure value set by the PLC control unit 41, control the opening and closing of the hydraulic flat valve 6 through the solenoid valve 21, or control the opening of the hydraulic throttle valve 7 through the proportional solenoid valve 31, adjust the working pressure of the downhole liquid and gas, speed up or slow down the delivery of the drilling fluid to adjust the actual downhole pressure value within the range of the safety pressure value.

[0023] Further, in order to avoid liquid backflow, the first hydraulic control module 2 further includes two first one-way throttle valves 23 arranged in parallel. The two first one-way throttle valves 23 are respectively connected to the output ends of the solenoid valve 21 and the first manual reversing valve. Similarly, the second hydraulic control module 3 further includes two second one-way throttle valves 33 arranged in parallel. The two second one-way throttle valves 33 are respectively connected to the output ends of the proportional solenoid valve 31 and the second manual reversing valve 32.

[0024] Furthermore, for the convenience of designing the power module 1 and improving the stability of the power module 1 at the same time, the power module 1 includes a liquid tank 12, a filter 13, an electric pump 14, a pneumatic pump 15, a manual pump 16, and an accumulator 17 connected by a first pipeline 11. The electric pump 14, the pneumatic pump 15, the manual pump 16, and the accumulator 17 are arranged in parallel. Among them, the electric pump 14, the pneumatic pump 15, and the manual pump 16 can all realize the system boosting function, and are used to transport the liquid in the liquid tank 12 through the filter 13 to the output end of the first pipeline and connect it to the input end of the hydraulic main pipeline 5. When there is a power outage on site and there is a gas source, the pneumatic pump 15 can be used to boost the system. When there is a power outage and no gas source on site, the manual pump 16 is used as an emergency pump to boost the pressure. The accumulator 17 can store energy and stabilize the pressure of the hydraulic system.

[0025] Furthermore, a hydraulic inductor 111, a pressure switch 112, a safety valve 113, and a pressure relief valve 114 are also provided on the first pipeline. The safety valve 113 and the pressure relief valve 114 are arranged in parallel and are both connected to the liquid tank 12. Among them, the safety valve 113 is used to prevent the hydraulic system from overpressure. The hydraulic inductor 111 is used to monitor the pressure of the hydraulic system. The pressure switch 112 can be used to control the automatic start and stop of the electric pump 14, that is, the pressure switch 112 is set with a preset pressure value. When the pressure exceeds the preset pressure value after the electric pump 14 starts, the electric pump 14 automatically shuts down. Conversely, the electric pump 14 starts.

[0026] Furthermore, in order to facilitate the control of the pressure at the output end of the power module 1, a pressure regulating valve 18 is provided at the output end of the first pipeline, and the output end of the pressure regulating valve 18 is communicated with the input end of the hydraulic main circuit 5.

[0027] Furthermore, in order to control the working states of the hydraulic flat valve 6 and the hydraulic throttle valve 7, the first hydraulic control module 2 further includes a proximity switch 24 for sensing the switch state of the hydraulic flat valve 6, and the second hydraulic control module 3 further includes a displacement sensor 34 for sensing the opening state of the hydraulic throttle valve 7. The proximity switch 24 and the displacement sensor 34 are both electrically connected to the PLC control unit 41. In this way, the PLC can control the solenoid valve 21 and the proportional solenoid valve 31 to accurately control the hydraulic flat valve 6 and the hydraulic throttle valve 7 respectively.

[0028] Furthermore, in order to facilitate the design of the electric control module 4 and facilitate the PLC control unit to program and control external electronic components or devices, the electric control module 4 further includes an industrial computer 42, a host computer 43 and a slave computer 44. Other electrical control modules can also be added according to actual control requirements. The PLC control unit 41 is also electrically connected to the blowout preventer at the wellhead and can be used to prevent blowout. Among them, the industrial computer 42 can be equipped with a display screen for displaying parameters such as the actual pressure value underground.

[0029] In summary, the embodiment of the present invention provides a drilling downhole liquid-gas pressure control system. The pressure control system includes a power module 1, a first hydraulic control module 2, a second hydraulic control module 3, and an electric control module 4. The PLC control unit 41 is electrically connected to the power module 1, the solenoid valve 21, the proportional solenoid valve 31, and the first pressure sensor underground. The PLC control unit 41 collects the actual pressure value underground measured by the first pressure sensor, compares it with the range of the underground safety pressure value set by the PLC control unit 41, controls the opening and closing of the hydraulic flat valve 6 through the first hydraulic control module 2, and controls the opening of the throttle valve through the second hydraulic control module 3 to adjust the working pressure of the underground liquid and gas. The transportation of the drilling fluid speeds up or slows down the output of the underground drilling fluid, and then adjusts the actual pressure value underground to be within the safety pressure value range, improving the drilling efficiency and safety. In addition, the first hydraulic control module 2 includes a solenoid valve 21 and a first manual reversing valve 22 arranged in parallel; the second hydraulic control module 3 includes a proportional solenoid valve 31 and a second manual reversing valve 32 arranged in parallel, and the hydraulic flat valve 6 and the hydraulic throttle valve 7 can be controlled manually or automatically respectively to improve the stability of system control.

[0030] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A downhole liquid and gas pressure control system for drilling, in which the downhole liquid and gas are used to adjust the downhole pressure, characterized in that: It includes a power module, a first hydraulic control module, a second hydraulic control module, and an electronic control module; The output end of the power module is connected to a hydraulic main circuit, and the hydraulic main circuit is provided with a throttling pipeline and a well-killing pipeline for adjusting the working pressure of the underground liquid and gas; The parallel branches of the well-killing pipeline are all provided with hydraulic flat valves, and the input end of each hydraulic flat valve is provided with the first hydraulic control module, and the first hydraulic control module includes a solenoid valve and a first manual reversing valve arranged in parallel; The parallel branches of the throttling pipeline are each provided with a hydraulic throttling valve, and the input end of each of the hydraulic throttling valves is provided with the second hydraulic control module, and the second hydraulic control module includes a proportional solenoid valve and a second manual reversing valve arranged in parallel; The electric control module includes a PLC control unit, and the PLC control unit is electrically connected to the power module, the solenoid valve, the proportional solenoid valve and a first pressure sensor downhole.

2. The downhole liquid and gas pressure control system for drilling as claimed in claim 1, characterized in that: The first hydraulic control module further includes two first one-way throttle valves arranged in parallel, and the two first one-way throttle valves are respectively connected to the output end of the solenoid valve and the first manual reversing.

3. The downhole liquid and gas pressure control system for drilling as claimed in claim 1, characterized in that: The second hydraulic control module further includes two second one-way throttle valves arranged in parallel, and the two second one-way throttle valves are respectively connected to the output ends of the proportional solenoid valve and the second manual reversing valve.

4. The downhole liquid and gas pressure control system for drilling as claimed in claim 1, characterized in that: The power module includes a liquid tank, a filter, an electric pump, a pneumatic pump, a manual pump, and an accumulator connected through a first pipeline. The electric pump, the pneumatic pump, the manual pump, and the accumulator are arranged in parallel.

5. The downhole liquid and gas pressure control system for drilling as claimed in claim 4, characterized in that: The first pipeline is also provided with a hydraulic sensor, a safety valve and a pressure relief valve. The safety valve and the pressure relief valve are connected in parallel and are both communicated with the liquid tank.

6. The downhole liquid and gas pressure control system for drilling as claimed in claim 4, characterized in that: A pressure regulating valve is provided at the output end of the first pipeline, and the output end of the pressure regulating valve is communicated with the input end of the hydraulic main circuit.

7. The downhole liquid and gas pressure control system for drilling as claimed in claim 1, characterized in that: The first hydraulic control module also includes a proximity switch for sensing the switch state of the hydraulic flat valve, and the second hydraulic control module also includes a displacement sensor for sensing the opening state of the hydraulic throttle valve. The proximity switch and the displacement sensor are both electrically connected to the PLC control unit.

8. The downhole liquid and gas pressure control system for drilling as claimed in claim 1, characterized in that: The electric control module also includes an industrial computer, a host computer and a slave computer, and the PLC control unit is also electrically connected to the blowout preventer at the wellhead.

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