Energy feedback system of well drilling hydraulic lifting equipment and control method of energy feedback system

Abstract

The invention provides an energy feedback system of well drilling hydraulic lifting equipment and a control method of the energy feedback system. The energy feedback system of the well drilling hydraulic lifting equipment comprises a main distribution board, a power management system, a well drilling hydraulic lifting control system, a hydraulic drilling rig distribution board and a propeller device. The main distribution board is electrically connected with at least one main generator; the power management system is electrically connected with the main distribution board; the well drilling hydraulic lifting control system is electrically connected with the power management system; the hydraulic drilling rig distribution board is electrically connected with the hydraulic motor and the hydraulic pump; and the propeller device is electrically connected with the main distribution board. The power is subjected to balanced configuration through the power management system, regenerated energy generated by the well drilling hydraulic lifting system is effectively utilized, and the technical problem that in the prior art, a system capable of storing excess energy of the well drilling hydraulic lifting control system according to capacity is lacked is solved.

Description

Technical Field:

[0001] The present invention relates to the technical field of drilling, and particularly to an energy feedback system and a control method thereof for a drilling hydraulic lifting device. Background Art:

[0002] The current drilling hydraulic lifting system uses a hydraulic cylinder to lift and lower the top drive system, and controls the lifting and lowering speed by controlling the telescopic speed of the hydraulic cylinder. The existing system generally includes an electric drive system, an HPU (hydraulic power unit), a cooling system, an accumulator with a compensation function, a hydraulic cylinder, and a control system, etc. Currently, the electric drive system directly drives the HPU motor with alternating current; the hydraulic power unit provides power for the up and down telescopic operation of the hydraulic cylinder; the accumulator can be used to store the energy fed back when the lifting system is lowered, and at the same time, the accumulator can provide additional power for the hydraulic cylinder under special working conditions; the cooling system is used to cool the temperature of the hydraulic oil in the HPU oil tank to absorb part of the energy generated when the lifting system is lowered; the control system controls the stroke of the hydraulic cylinder by controlling the flow rate of the HPU, thereby controlling the lifting and lowering speed of the lifting system.

[0003] There is an urgent need for an energy feedback system for a drilling hydraulic lifting device, which helps to solve the technical problem in the prior art that there is a lack of a system capable of storing a large amount of redundant energy in the drilling hydraulic lifting control system. Summary of the Invention:

[0004] In one embodiment, the present invention provides an energy feedback system for a drilling hydraulic lifting device, which balances the power configuration through a power management system and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system, and helps to solve the technical problem in the prior art that there is a lack of a system capable of storing a large amount of redundant energy in the drilling hydraulic lifting control system.

[0005] The energy feedback system for the drilling hydraulic lifting device includes a main switchboard, a power management system, a drilling hydraulic lifting control system, a hydraulic drilling rig switchboard, and a thruster device;

[0006] The main switchboard is electrically connected to at least one main generator;

[0007] The power management system is electrically connected to the main switchboard;

[0008] The drilling hydraulic lifting control system is electrically connected to the power management system;

[0009] The hydraulic drilling rig switchboard is electrically connected to a hydraulic motor and a hydraulic pump;

[0010] The thruster device is electrically connected to the main switchboard, so that the drilling hydraulic lifting control system sends an energy feedback request signal to the power management system, and then analyzes the individual loads of the generators and energy storage systems configured on the main switchboard, and calculates the maximum regenerative power that the power grid can receive and the regenerative power ramp. The power management system sends the maximum regenerative power limit value and the maximum allowable regenerative ramp to the drilling hydraulic lifting control system. The drilling hydraulic lifting control system controls the magnitude of the regenerative power and the power ramp by controlling the descending speed of the lifting device. The hydraulic drilling rig switchboard feeds back the actually generated power value to the power management system. The power management system calculates and adjusts the loads on the main generator and the energy storage battery system in real time to adapt to the smooth change of the loads between the connected main generators, and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system.

[0011] In one embodiment, the thruster device includes a thruster transformer, a thruster frequency converter, and a thruster, which are connected in series and then electrically connected to the main switchboard.

[0012] In one embodiment, a main transformer is connected in series between the main switchboard and the hydraulic drilling rig switchboard.

[0013] In one embodiment, the energy storage battery system includes an energy storage system transformer, an energy storage system inverter, and an energy storage system battery, which are connected in series.

[0014] In one embodiment, the hydraulic motor and the hydraulic pump are connected in series and then electrically connected to the hydraulic drilling rig switchboard.

[0015] In one embodiment, the at least one main generator includes a first main generator and a second main generator.

[0016] In one embodiment, the present invention also provides a control method for the energy feedback system of a drilling hydraulic lifting device. This method is based on the energy feedback system of the drilling hydraulic lifting device. The energy feedback system of the drilling hydraulic lifting device includes:

[0017] A main switchboard, which is electrically connected to at least one main generator;

[0018] A power management system, which is electrically connected to the main switchboard;

[0019] A drilling hydraulic lifting control system, which is electrically connected to the power management system;

[0020] A hydraulic drilling rig switchboard, which is electrically connected to a hydraulic motor and a hydraulic pump;

[0021] A thruster device, which is electrically connected to the main switchboard;

[0022] The control method of the energy feedback system of the described drilling hydraulic lifting equipment includes:

[0023] The described drilling hydraulic lifting control system sends an energy feedback request signal to the power management system, analyzes the individual loads of the configured generator and energy storage system on the main switchboard, and calculates the maximum grid-receivable regenerative power and the regenerative power ramp;

[0024] The power management system sends the maximum regenerative power limit value and the maximum allowable regenerative ramp to the drilling hydraulic lifting control system;

[0025] The drilling hydraulic lifting control system controls the descending speed of the lifting device to control the magnitude and power ramp of the regenerative power;

[0026] The hydraulic drilling rig switchboard feeds back the actually generated power value to the power management system;

[0027] The power management system calculates and adjusts the loads on the main generator and the energy storage battery system in real time, adapts to the smooth change of the loads between the connected main generators, and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system.

[0028] In one embodiment, after the step that the power management system calculates and adjusts the loads on the main generator and the energy storage battery system in real time, adapts to the smooth change of the loads between the connected main generators, and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system, the method further includes:

[0029] When the energy feedback stops, the drilling hydraulic lifting control system sends a feedback stop signal to the power management system, and the power management system will readjust the loads on each on-grid main generator and the energy storage battery system to ensure the stability of the power grid.

[0030] In one embodiment, the main motor of the hydraulic pump station uses an AC reversible motor.

[0031] In one embodiment, the drilling hydraulic pump uses a variable displacement pump. Description of the drawings:

[0032] Figure 1 It is a schematic structural diagram of an energy feedback system of a drilling hydraulic lifting equipment in an embodiment of the present invention.

[0033] Reference numerals:

[0034] Main switchboard 1

[0035] Main generator 2

[0036] First main generator 21

[0037] Second main generator 22

[0038] Power management system 3

[0039] Drilling hydraulic lifting control system 4

[0040] Hydraulic drilling distribution board 5

[0041] Hydraulic motor 51

[0042] Hydraulic pump 52

[0043] Thruster device 6

[0044] Thruster transformer 61

[0045] Thruster frequency converter 62

[0046] Thruster 63

[0047] Energy storage battery system 7

[0048] Energy storage system transformer 71

[0049] Energy storage system inverter 72

[0050] Energy storage system battery 73 Specific embodiments:

[0051] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] Reference is made herein to the various aspects and features of the present application as described with reference to the accompanying drawings.

[0053] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given as non-limiting examples with reference to the accompanying drawings.

[0054] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the scope of protection defined hereby.

[0055] When combined with the accompanying drawings, the above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0056] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present application and can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to determine the true intention based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a substantially arbitrarily suitable detailed structure in various ways.

[0057] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments according to the present application.

[0058] In the prior art, the energy storage capacity of the accumulator is limited. When continuously lowering the riser or tripping in and out of the well, the regenerative energy generated by the hydraulic lifting system cannot be completely absorbed by the accumulator. Moreover, the volume and capacity of the current accumulator are already very large. If the capacity of the accumulator is further increased, it will cause difficulties in equipment layout and increase costs.

[0059] At present, in the energy feedback of the hydraulic drilling rig, except for part of the energy absorbed by the accumulator, the rest is consumed by the cooling system and not fed back to the power grid, resulting in poor energy-saving effects.

[0060] The current method for solving the energy feedback of the hydraulic drilling rig: additional frequency conversion drive devices and batteries need to be configured to absorb the feedback energy, which not only increases the equipment cost, but also increases the difficulty of equipment layout for a drilling ship with a compact space.

[0061] The present invention aims to solve the problem of regenerative energy generated by the drilling hydraulic lifting system of a drilling ship / platform, and proposes a new method for reusing the regenerative energy. Without the need to additionally configure batteries and frequency converters, through a specific power grid structure and certain control strategies, the regenerative energy can be directly fed back to the main power grid for reuse, achieving the effect of energy conservation and emission reduction. This technology belongs to the field of drilling technology and specifically refers to a method for solving the energy feedback of a hydraulic drilling rig.

[0062] Figure 1 It is a schematic structural diagram of an energy feedback system of a drilling hydraulic lifting device in an embodiment of the present invention. As Figure 1 shown, in one embodiment, the present invention provides an energy feedback system for a drilling hydraulic lifting device. The energy feedback system of the drilling hydraulic lifting device includes a main switchboard 1, a power management system 3, a drilling hydraulic lifting control system 4, a hydraulic drilling rig switchboard 5, and a thruster device 6;

[0063] The main switchboard 1 is electrically connected to at least one main generator 2;

[0064] The power management system 3 is electrically connected to the main switchboard 1;

[0065] The drilling hydraulic lifting control system 4 is electrically connected to the power management system 3;

[0066] The hydraulic drilling rig switchboard 5 is electrically connected to the hydraulic motor 51 and the hydraulic pump 52;

[0067] The thruster device 6 is electrically connected to the main switchboard 1, so that the drilling hydraulic lifting control system 4 sends an energy feedback request signal to the power management system 3, and then analyzes the individual loads of the main generator 2 and the energy storage system configured by the main switchboard 1, calculates the maximum grid-receivable regenerative power and the regenerative power ramp. The power management system 3 sends the maximum regenerative power limit value and the maximum allowable regenerative ramp to the drilling hydraulic lifting control system 4. The drilling hydraulic lifting control system 4 controls the magnitude of the regenerative power and the power ramp by controlling the descending speed of the lifting device. The hydraulic drilling rig switchboard 5 feeds back the actually generated power value to the power management system 3. The power management system 3 calculates and adjusts the loads on the main generator 2 and the energy storage battery system 7 in real time to adapt to the smooth change of the loads among the connected main generators 1 and effectively utilize the regenerative energy generated by the drilling hydraulic lifting system 4.

[0068] In this embodiment, a specific implementation manner of the energy feedback system of the drilling hydraulic lifting equipment is provided, and its working principle is to manage and distribute energy through the power management system 3, which helps to solve the technical problem in the prior art that there is a lack of a system that can store the redundant energy of the drilling hydraulic lifting control system in a large capacity.

[0069] It should be noted that it involves the power grid, the thruster device 6, the hydraulic drilling rig, etc. The main generator 2 is on the energy input side, and the above specific calculation method is based on the hardware configuration of the system.

[0070] In one embodiment, the thruster device 6 includes a thruster transformer 61, a thruster frequency converter 62, and a thruster 63, which are electrically connected in series to the main switchboard 1 in sequence.

[0071] In this embodiment, a specific implementation manner of the thruster device 6 is provided.

[0072] In one embodiment, a main transformer 7 is connected in series between the main switchboard 1 and the hydraulic drilling rig switchboard 5.

[0073] In this embodiment, a specific system structure with the main transformer 7 is provided.

[0074] In one embodiment, the energy storage battery system 7 includes an energy storage system transformer 71, an energy storage system inverter 72, and an energy storage system battery 73, which are electrically connected in series in sequence.

[0075] Specific implementation manner of the energy storage battery system 7 in this embodiment.

[0076] In one embodiment, the hydraulic motor 51 and the hydraulic pump 52 are connected in series and then electrically connected to the hydraulic drilling rig distribution board 5.

[0077] In this embodiment, a specific electrical connection implementation manner of the hydraulic motor 51 and the hydraulic pump 52 connected in series to the hydraulic drilling rig distribution board 5 is provided.

[0078] In one embodiment, the present invention further provides a control method for the energy feedback system of a drilling hydraulic lifting device. The method is based on the energy feedback system of the drilling hydraulic lifting device, and the energy feedback system of the drilling hydraulic lifting device includes:

[0079] Electrically connected to at least one main generator 2 on the main distribution board 1;

[0080] The power management system 3 is electrically connected to the main distribution board 1;

[0081] The drilling hydraulic lifting control system 4 is electrically connected to the power management system 3;

[0082] The hydraulic drilling rig distribution board 5 is electrically connected to the hydraulic motor 51 and the hydraulic pump 52;

[0083] The thruster device 6 is electrically connected to the main distribution board 1;

[0084] The control method of the energy feedback system of the drilling hydraulic lifting device includes:

[0085] The drilling hydraulic lifting control system 4 sends an energy feedback request signal to the power management system 3, analyzes the individual loads of the generator 2 and the energy storage system configured on the main distribution board 1, and calculates the maximum grid-receivable regenerative power and the regenerative power ramp;

[0086] The power management system 3 sends the maximum regenerative power limit value and the maximum allowable regenerative ramp to the drilling hydraulic lifting control system 4;

[0087] The drilling hydraulic lifting control system 4 controls the magnitude and power ramp of the regenerative power by controlling the descending speed of the lifting device;

[0088] The hydraulic drilling rig distribution board 5 feeds back the actually generated power value to the power management system 3;

[0089] The power management system 3 calculates and adjusts the loads on the main generator 2 and the energy storage battery system 7 in real time to adapt to the smooth change of the loads among the connected main generators 2 and effectively utilize the regenerative energy generated by the drilling hydraulic lifting system 4.

[0090] In this embodiment, a specific implementation manner of a control method for an energy feedback system of a drilling hydraulic lifting device is provided.

[0091] In one embodiment, after the power management system calculates and adjusts the loads of the main generator 2 and the energy storage battery system 7 in real time to adapt to the smooth change of the loads between the connected main generators 2 and effectively utilize the regenerative energy generated by the drilling hydraulic lifting system 4, the method further includes:

[0092] When the energy feedback stops, the drilling hydraulic lifting control system 4 sends a feedback stop signal to the power management system 3, and the power management system 3 will readjust the loads of each on-grid main generator 2 and the energy storage battery system 7 to ensure the stability of the power grid.

[0093] In this embodiment, a specific implementation manner after the power management system calculates and adjusts the loads of the main generator 2 and the energy storage battery system 7 in real time to adapt to the smooth change of the loads between the connected main generators 2 and effectively utilize the regenerative energy generated by the drilling hydraulic lifting system 4 is provided.

[0094] In one embodiment, the main motor of the hydraulic pump station uses an AC reversible motor.

[0095] In this embodiment, a specific implementation manner of the hydraulic pump station is provided.

[0096] In one embodiment, the drilling hydraulic pump uses a variable displacement pump.

[0097] In this embodiment, a specific implementation manner of the drilling hydraulic pump is provided.

[0098] Beneficial effects:

[0099] 1. The present invention does not require an additional separate configuration of a battery and an inverter for absorbing feedback energy, reducing the equipment configuration cost.

[0100] 2. The power grid configuration of the present invention can directly receive the regenerative energy generated by the drilling hydraulic lifting system.

[0101] 3. The energy feedback method of the present invention is practical and effective. It can not only effectively utilize the feedback energy, but also ensure the stability of the main power grid.

[0102] 4. By using the energy feedback method of the present invention, the volume and capacity of the energy storage device and the cooler of the hydraulic drilling rig can be better optimized, reducing the equipment cost and space layout. Moreover, the equipment operates stably, has good energy-saving effects, achieves the effect of energy conservation and emission reduction, and reduces the equipment operation cost.

[0103] The key core points are as follows:

[0104] 1. In the present invention, the main power grid framework structure is used to ensure that the power grid can withstand the feedback energy of the drilling hydraulic lifting system.

[0105] 2. In the present invention, the main pump of the drilling hydraulic lifting system uses an AC reversible motor, the main pump of the lifting system adopts a soft start mode, and the drilling hydraulic pump uses a variable displacement pump. These configurations can open up the channel for the regenerative energy generated by the hydraulic lifting system to be fed back to the main power grid.

[0106] 3. The method for regenerative energy feedback of the drilling hydraulic lifting system in the present invention can enable the main power grid to effectively utilize the regenerative energy generated by the drilling hydraulic lifting system and can make the load change of the generator connected to the main power grid stable.

[0107] 4. All configurations and technical parameters of the main power grid equipment not described herein are considered necessary conditions for implementing the method for regenerative energy feedback of the drilling hydraulic lifting system in the present invention and fall within the scope of protection of this invention patent.

[0108] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and scope of protection of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the scope of protection of the present invention..

Claims

1. An energy feedback system for drilling hydraulic lifting equipment, characterized in that: The energy feedback system of the drilling hydraulic lifting equipment includes: A main switchboard (1) to which at least one main generator (2) is electrically connected; a power management system (3) electrically connected to the main switchboard (1); a drilling hydraulic lifting control system (4), which is electrically connected to the power management system (3); A hydraulic drilling rig switchboard (5), which is electrically connected to a hydraulic motor (51) and a hydraulic pump (52); A thruster device (6) is electrically connected to the main switchboard (1) so that the drilling hydraulic lifting control system (4) sends an energy feedback request signal to the power management system (3), thereby analyzing the single load of the main generator (2) and the energy storage system configured by the main switchboard (1), and calculating the maximum receivable regenerative power and the regenerative power slope of the power grid. The power management system (3) sends the maximum regenerative power limit value and the maximum allowable regenerative slope to the drilling hydraulic lifting control system (4). The drilling hydraulic lifting control system (4) controls the magnitude of the regenerative power and the power slope by controlling the descending speed of the lifting device. The hydraulic drilling rig switchboard (5) feeds back the actual power value generated to the power management system (3). The power management system (3) calculates and adjusts the load of the main generator (2) and the energy storage battery system (7) in real time to adapt to the stable load change between the connected main generators (1) and effectively utilize the regenerative energy generated by the drilling hydraulic lifting system (4).

2. The energy feedback system of the drilling hydraulic lifting equipment according to claim 1, characterized in that: The propeller device (6) comprises a propeller transformer (61), a propulsion frequency converter (62), and a propeller (63), which are sequentially connected in series and then electrically connected to the main switchboard (1).

3. The energy feedback system of the drilling hydraulic lifting equipment according to claim 2, characterized in that: A main transformer (7) is connected in series between the main switchboard (1) and the hydraulic drilling rig switchboard (5).

4. The energy feedback system of the drilling hydraulic lifting equipment according to claim 3 is characterized in that: The energy storage battery system (7) comprises an energy storage system transformer (71), an energy storage system inverter (72), and an energy storage system battery (73), which are electrically connected in series in sequence.

5. The energy feedback system of the drilling hydraulic lifting equipment according to claim 4, characterized in that: The hydraulic motor (51) and the hydraulic pump (52) are connected in series and are electrically connected to the hydraulic drilling rig power distribution board (5).

6. The energy feedback system of the drilling hydraulic lifting equipment according to claim 5, characterized in that: The at least one main generator (2) comprises a first main generator (21) and a second main generator (22).

7. A control method for an energy feedback system of a drilling hydraulic lifting device, characterized in that: The method is based on an energy feedback system of a drilling hydraulic lifting device, and the energy feedback system of the drilling hydraulic lifting device comprises: A main switchboard (1) to which at least one main generator (2) is electrically connected; a power management system (3) electrically connected to the main switchboard (1); a drilling hydraulic lifting control system (4), which is electrically connected to the power management system (3); A hydraulic drilling rig switchboard (5), which is electrically connected to a hydraulic motor (51) and a hydraulic pump (52); a thruster device (6) electrically connected to the main switchboard (1); The control method of the energy feedback system of the drilling hydraulic lifting equipment includes: The drilling hydraulic lifting control system (4) sends an energy feedback request signal to the power management system (3), analyzes the single load of the generator (2) and the energy storage system configured by the main switchboard (1), and calculates the maximum receivable regenerative power and regenerative power slope of the power grid; The power management system (3) sends a maximum regeneration power limit value and a maximum permissible regeneration slope to the drilling hydraulic lifting control system (4); The drilling hydraulic lifting control system (4) controls the magnitude of the regenerative power and the power slope by controlling the descending speed of the lifting device; The hydraulic drilling rig power distribution board (5) feeds back the actually generated power value to the power management system (3); The power management system (3) calculates and adjusts the load on the main generator (2) and the energy storage battery system (7) in real time, adapts to the smooth change of the load between the connected main generators (2), and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system (4).

8. The control method of the energy feedback system of the drilling hydraulic lifting equipment according to claim 7, characterized in that: After the power management system calculates and adjusts the loads of the main generator (2) and the energy storage battery system (7) in real time, adapts to the stable load changes between the connected main generators (2), and effectively utilizes the regenerative energy generated by the drilling hydraulic lifting system (4), the method further comprises: When energy feedback stops, the drilling hydraulic lifting control system (4) sends a feedback stop signal to the power management system (3), and the power management system (3) will readjust the loads of each main generator (2) on the grid and the energy storage battery system (7) to ensure grid stability.

9. The control method of the energy feedback system of the drilling hydraulic lifting equipment according to claim 8, characterized in that: The main motor of the hydraulic pump station adopts an AC reversible motor.

10. The control method of the energy feedback system of the drilling hydraulic lifting equipment according to claim 9, characterized in that: The drilling hydraulic pump adopts a variable displacement pump.

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