A power supply system for solving energy feedback of a hydraulic drilling machine

Abstract

This invention relates to the field of drilling technology, specifically to a power supply system for solving energy feedback in hydraulic drilling rigs. It works in conjunction with a hydraulic cylinder lifting system and includes an interconnected electrical system and a DC power supply system. The electrical system uses DC power. The electrical system includes a main distribution circuit and a frequency converter circuit, both connected to a transformer. The frequency converter circuit includes a frequency converter, which is connected to an energy storage battery system, at least one hydraulic motor, and the DC power supply system. In this invention, the hydraulic pump motor uses frequency conversion drive, reducing the impact of equipment operation on the power station and providing a path for energy feedback back to the grid. The energy storage battery system is connected to a DC busbar to absorb feedback energy promptly, providing emergency power to the equipment and ensuring equipment safety. The hydraulic pump is a double-acting variable pump, which can be used as both a motor and a pump, providing a path for energy feedback.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and specifically to a power supply system for solving the energy feedback problem of hydraulic drilling rigs. Background Technology

[0002] Top drive hoisting systems used in drilling platforms, drilling ships, and land drilling rigs mostly employ wire rope drilling winches. Hydraulic cylinder hoisting systems offer numerous advantages over traditional drilling winch systems, such as an integrated compensation system that eliminates the need for a bulky overhead crane compensation system, reducing derrick weight, lowering the ship's center of gravity, ensuring smoother operation, and lowering the failure rate. Therefore, they have a promising future in drilling platform applications. Currently, two equipment manufacturers, NOV and MH, possess this product and technology.

[0003] Current hydraulic lifting system solutions, based on their operational capabilities and equipment characteristics, are divided into two types: those with an odd number of hydraulic cylinders and those with an even number of hydraulic cylinders. The cylinders are used to lift and lower the top drive system, and the lifting and lowering speed is controlled by adjusting the cylinder speed. Existing systems generally include an electric drive system, a hydraulic power unit (HPU), a cooling system, an energy accumulator, hydraulic cylinders (with compensation functions integrated into the cylinders), and a control system.

[0004] Currently, the electric drive system uses AC power to directly drive the HPU motor. The hydraulic station provides power to the hydraulic cylinder for movement. The energy accumulator stores the energy fed back during the lowering of the hydraulic cylinder. Simultaneously, the energy accumulator can provide additional power to the hydraulic cylinder system under special operating conditions. The cooling system cools the hydraulic oil and absorbs some of the energy fed back from the hydraulic cylinder. The control system controls the hydraulic cylinder stroke by controlling the HPU flow rate, thereby controlling the lifting and lowering speed of the lifting system.

[0005] Existing power supply systems have the following shortcomings:

[0006] 1. During continuous lowering of the riser or tripping of the drill string, the regenerative energy generated by the hydraulic drilling rig cannot be absorbed by the energy storage device. The energy storage device has a limited capacity, and the current energy storage devices are already very large in size and capacity, making equipment layout difficult and increasing costs.

[0007] 2. Currently, the energy feedback of hydraulic drilling rigs is partially absorbed by the energy storage device, and the rest is consumed through the cooler, without being fed back to the power grid, resulting in poor energy-saving effect;

[0008] 3. Currently, the hydraulic pumps of hydraulic drilling rigs are directly driven instead of using frequency conversion drive, which causes a significant impact on the power grid during operation and affects power grid security. Summary of the Invention

[0009] The purpose of this invention is to address the problems existing in the prior art by providing a power supply system for solving the energy feedback of hydraulic drilling rigs. This system can solve the problem of energy feedback from hydraulic drilling rigs back to the power grid, thereby achieving energy saving and emission reduction, and reducing equipment operating costs.

[0010] To address the problems existing in the prior art, the present invention adopts the following technical solution:

[0011] A power supply system for solving energy feedback in hydraulic drilling rigs, used in conjunction with a hydraulic cylinder lifting system, includes an interconnected electrical system and a DC power supply system, wherein the electrical system uses DC power supply.

[0012] The power system includes a main distribution circuit and a frequency conversion substation circuit, which are respectively connected to a transformer.

[0013] The frequency conversion circuit includes a frequency converter, which is connected to the energy storage battery system, at least one hydraulic motor and the DC power supply system.

[0014] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the DC power supply system includes a phase-shifting transformer, a rectifier, and a power supply that are interconnected.

[0015] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the energy storage battery system includes multiple battery packs and is connected to at least one DC bus.

[0016] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the hydraulic motor adopts a double-acting variable pump.

[0017] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the hydraulic motor is connected to the hydraulic pump; when the hydraulic cylinder lifting system is lowered, the feedback energy drives the hydraulic motor to generate electricity through the hydraulic pump, and feeds it back to the energy storage battery system through the frequency converter.

[0018] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the power supply system for solving the energy feedback of hydraulic drilling rigs is also used in conjunction with a power station management system, which is used to provide feedback on the energy level and control the charging and discharging of the energy storage battery system.

[0019] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the main distribution circuit also includes at least two vacuum circuit breakers.

[0020] At least two of the vacuum circuit breakers include a first vacuum circuit breaker and a second vacuum circuit breaker, wherein the first vacuum circuit breaker is connected to the main generator;

[0021] The second vacuum circuit breaker is connected to the transformer.

[0022] As an improvement to the technical solution of the power supply system for solving the energy feedback of hydraulic drilling rigs in this invention, the frequency conversion circuit also includes at least one frame-type circuit breaker.

[0023] The frame-type circuit breaker is connected to the transformer and the DC power supply system, respectively.

[0024] The beneficial effects of this invention are:

[0025] In this invention, the hydraulic pump motor adopts frequency conversion drive, which reduces the impact of equipment operation on the power station and provides a path for energy feedback back to the power grid; the energy storage battery system is connected to the DC bus to absorb feedback energy in a timely manner, provide emergency power for the equipment, and ensure equipment safety; the hydraulic pump adopts a double-acting variable pump, which can be used as a motor or a pump, providing a path for energy feedback. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0028] like Figure 1 As shown, a power supply system for solving energy feedback in hydraulic drilling rigs is used in conjunction with a hydraulic cylinder lifting system. The power supply system for solving energy feedback in hydraulic drilling rigs includes an interconnected electrical system and a DC power supply system, wherein the electrical system uses DC power.

[0029] The power system includes main distribution circuits and frequency conversion substation circuits, which are connected to transformers respectively.

[0030] As a first embodiment of the present invention, the main distribution circuit further includes at least two vacuum circuit breakers; the at least two vacuum circuit breakers include a first vacuum circuit breaker and a second vacuum circuit breaker, the first vacuum circuit breaker being connected to the main generator; and the second vacuum circuit breaker being connected to the transformer.

[0031] As a second embodiment of the present invention, the frequency conversion circuit further includes at least one frame-type circuit breaker; the frame-type circuit breaker is connected to the transformer and the DC power supply system respectively.

[0032] In a first embodiment of the present invention, the DC power supply system includes a phase-shifting transformer, a rectifier, and a power source connected to each other, wherein the power source can be a generator, and the generator can generate DC power through the phase-shifting transformer and the rectifier.

[0033] In a second embodiment of the present invention, the energy storage battery system includes multiple battery banks, and the energy storage battery system is connected to at least one DC bus. The total battery capacity calculation must meet the maximum load conditions of the hydraulic lifting system, and multiple battery banks and multiple DC buses are set according to the operating conditions.

[0034] In a third embodiment of the invention, the hydraulic motor employs a double-acting variable pump. Furthermore, the hydraulic motor is connected to the hydraulic pump; when the hydraulic cylinder lifting system is lowered, the feedback energy drives the hydraulic motor to generate electricity via the hydraulic pump, and this electricity is fed back to the energy storage battery system via a frequency converter.

[0035] The hydraulic motor is driven by a frequency converter. The hydraulic motor uses a double-acting variable pump, allowing it to function as both a motor and a pump. When the hydraulic lifting system is lowered, the feedback energy drives the hydraulic motor to generate electricity via the hydraulic pump. This electricity is then fed back to the DC bus via the frequency converter and absorbed by the battery and other equipment, achieving the effect of energy feedback back to the power grid.

[0036] As a fourth embodiment of the present invention, the power supply system for solving the energy feedback of the hydraulic drilling rig is also used in conjunction with the power station management system. The power station management system is used to feed back the energy level and control the charging and discharging of the energy storage battery system. By controlling the amount of energy fed back through the power station management system, the operating efficiency of the hydraulic lifting system is improved. When the hydraulic drilling rig is in use, its energy-saving effect is good, and the volume and capacity of the energy storage device and cooler can be better optimized. Moreover, the equipment operation is more stable, achieving the effect of energy saving and emission reduction, reducing equipment operating costs, and the volume and capacity of the energy storage device and cooler can be better optimized, reducing equipment costs and space layout.

[0037] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A power supply system for solving energy feedback in hydraulic drilling rigs, characterized in that, Used in conjunction with a hydraulic cylinder lifting system, it includes an interconnected electrical system and a DC power supply system, wherein the electrical system uses DC power supply; The power system includes a main distribution circuit and a frequency conversion substation circuit, and the main distribution circuit and the frequency conversion substation circuit are respectively connected to a transformer; The frequency conversion circuit includes a frequency converter, which is connected to the energy storage battery system, at least one hydraulic motor and the DC power supply system respectively. The energy storage battery system includes multiple battery packs, and the energy storage battery system is connected to at least one DC bus. The hydraulic motor is connected to the hydraulic pump; when the hydraulic cylinder lifting system is lowered, the feedback energy drives the hydraulic motor to generate electricity through the hydraulic pump, and then feeds it back to the energy storage battery system through the frequency converter. The main distribution circuit also includes at least two vacuum circuit breakers; the at least two vacuum circuit breakers include a first vacuum circuit breaker and a second vacuum circuit breaker, the first vacuum circuit breaker being connected to the main generator; the second vacuum circuit breaker being connected to the transformer; The frequency conversion circuit also includes at least one frame-type circuit breaker; the frame-type circuit breaker is connected to the transformer and the DC power supply system respectively.

2. The power supply system for solving energy feedback in hydraulic drilling rigs according to claim 1, characterized in that, The DC power supply system includes interconnected phase-shifting transformers, rectifiers, and power supplies.

3. The power supply system for solving energy feedback in hydraulic drilling rigs according to claim 1, characterized in that, The hydraulic motor is a double-acting variable pump.

4. The power supply system for solving energy feedback in hydraulic drilling rigs according to claim 1, characterized in that, The power supply system for solving the energy feedback of the hydraulic drilling rig is also used in conjunction with the power station management system, which is used to provide feedback on the energy level and control the charging and discharging of the energy storage battery system.

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