Patent ID: 12203353

DETAILED DESCRIPTION

In order to make objects, technical details and advantages of embodiments of the present disclosure clear, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the related drawings. It is apparent that the described embodiments are just a part but not all of the embodiments of the present disclosure. Based on the described embodiments herein, those skilled in the art can obtain, without any inventive work, other embodiment(s) which should be within the scope of the present disclosure.

Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms “first,” “second,” etc., which are used in the description and claims of the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. The terms “comprises,” “comprising,” “includes,” “including,” etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects listed after these terms as well as equivalents thereof, but do not exclude other elements or objects. The phrases “connect”, “connected”, etc., are not intended to define a physical connection or a mechanical connection, but may comprise an electrical connection which is direct or indirect.

At present, in the field of oil and gas exploitation, the electrically-driven devices are more and more widely used; however, because most oil and gas well sites are located in remote areas where power supply facilities are inadequate, power generation devices need to be equipped to supply power to electrically-driven devices.

However, under the circumstances that power generation devices are used to supply power to the electrically-driven devices of the well site, because the power generation devices need to satisfy the maximum power demand of the electrically-driven devices in the whole well site, the rated power of the power generation devices need to be configured relatively large (e.g., greater than 30 MW); on the other hand, because a lot of electrically-driven devices (such as electrically-driven fracturing device) in the well site usually operate intermittently, which results in a large fluctuation of the power demand of the well site, and the power generation devices would often be in an idle state. However, while the power generation devices are in the idle state, they still consume a lot of fuel, and the fuel efficiency is low, the fuel economy is poor. In addition, once the power generation device is powered off due to failure, all of the electrically-driven devices in the whole well site will be powered off, thereby resulting in various accidents.

For example, during the process of fracturing operation, the electrically-driven fracturing device needs a break of more than ten minutes to two hours after continuous high-power (e.g., 5000 KW-30 MW) operation for about two hours; during the break, some electrically-driven devices (e.g., control devices, necessary heat dissipation devices, and lubrication devices) still need power supply, but the power demand of the whole well site is less than 1000 KW. In this case, the high-power power generation device merely needs to provide power output of 1000 KW, and thus will be in the idle state, which results in low fuel efficiency and poor fuel economy of the power generation device. For another example, when the power generation device is powered off suddenly, the heat dissipation device and the lubrication device also stop operating, while devices (such as fracturing motor or fracturing pump) still operate due to inertia, and cannot be dissipated and lubricated through the heat dissipation device and the lubrication device, thereby resulting in the occurrence of phenomenon such as high temperature and abnormal wear, and further reducing the service life of the equipment and even causing the damage of the equipment.

On the other hand, in the electrically-driven fracturing device, in addition to the power supply needed for the fracturing motor, the fracturing auxiliary devices (such as lubrication device, heat dissipation device, and ventilation device) used for assisting the operations of the fracturing motor and fracturing pump also need power supply. In addition, while the fracturing motor and the fracturing pump are operating, other fracturing auxiliary devices also need power supply; otherwise, the electrically-driven fracturing device would not operate normally or even be damaged. For example, if the heat dissipation device does not operate while the fracturing motor and the fracturing pump are operating, the fracturing motor, the fracturing pump, and electrical components would be damaged due to high temperature.

In this regard, the embodiments of the present disclosure provide an electrically-driven fracturing system. The electrically-driven fracturing system includes a main power generation device, a first auxiliary power generation device, a switch device, and an electrically-driven fracturing device. The switch device includes a low-voltage switch group and a high-voltage switch group; the electrically-driven fracturing device includes a fracturing motor and a fracturing auxiliary device; the rated generation power of the main power generation device is greater than the rated generation power of the first auxiliary power generation device, and the rated output voltage of the main power generation device is greater than the rated output voltage of the first auxiliary power generation device; the high-voltage switch group includes an input end and an output end, the low-voltage switch group includes an input end and an output end; the input end of the high-voltage switch group is connected to the main power generation device, the output end of the high-voltage switch group is connected to the fracturing motor, the input end of the low-voltage switch group is connected to the first auxiliary power generation device, and the output end of the low-voltage switch group is connected to the fracturing auxiliary device. As such, the electrically-driven fracturing system can switch the working states of the main power generation device and the auxiliary power generation device according to the power consumption of the electrically-driven fracturing system. This prevents, on the one hand, the main power generation device from often being in the idle state, and improve the fuel efficiency and fuel economy, and on the other hand, the power failure and shutdown of the whole electrically-driven fracturing system caused by the sudden power failure of the main power generation device.

Hereinafter, the electrically-driven fracturing system provided by the embodiments of the present disclosure will be described in detail below in combination with the accompanying drawings.

An embodiment of the present disclosure provides an electrically-driven fracturing system.FIG.1is a schematic diagram of an electrically-driven fracturing system provided by an embodiment of the present disclosure. As shown inFIG.1, the electrically-driven fracturing system001includes a main power generation device100, a first auxiliary power generation device200, a switch device300, and an electrically-driven fracturing device400. The switch device includes a low-voltage switch group310and a high-voltage switch group320, and the electrically-driven fracturing device400includes a fracturing motor420and a fracturing auxiliary device410. The rated generation power of the main power generation device100is greater than the rated generation power of the first auxiliary power generation device200, the rated output voltage of the main power generation device100is greater than the rated output voltage of the first auxiliary power generation device200, the high-voltage switch group320includes an input end and an output end, the low-voltage switch group310includes an input end and an output end. The input end of the high-voltage switch group320is connected to the main power generation device100, the output end of the high-voltage switch group320is connected to the fracturing motor420, the input end of the low-voltage switch group310is connected to the first auxiliary power generation device200, and the output end of the low-voltage switch group310is connected to the fracturing auxiliary device410. It should be noted that, the above-described connection between the high-voltage switch group and the fracturing motor includes the case of direct connection, and also includes the case of indirect connection through other electrical devices or electrical elements; similarly, the connection between the low-voltage switch group and the auxiliary fracturing device includes the case of direct connection, and also includes the case of indirect connection through other electrical devices or electrical elements.

In the electrically-driven fracturing system provided by the embodiments of the present disclosure, when the fracturing motor needs to operate, the main power generation device is started and power is supplied to the fracturing motor through the high-voltage switch group, when the fracturing motor does not need to operate, the main power generation device may be shut off, and power is supplied to the fracturing auxiliary device merely by the first auxiliary power generation device through the low-voltage switch group. In addition, when the main power generation device is suddenly powered off for various reasons, the first auxiliary power generation device can ensure the normal operation of the fracturing auxiliary device, and avoid the damage of equipment caused by the power failure of the fracturing auxiliary device. As such, through disposing the above-described main power generation device, auxiliary power generation device, and switch device including high-voltage switch group and low-voltage switch group, the electrically-driven fracturing system can switch the working states of the main power generation device and the auxiliary power generation device according to the power consumption of the electrically-driven fracturing system, on the one hand, the normal operation of the fracturing auxiliary device can be ensured, while the main power generation being often in the idle state is avoided, the fuel efficiency and fuel economy are improved, on the other hand, the power failure and shutdown of the whole electrically-driven fracturing system caused by the sudden power failure of the main power generation device can be avoided, thereby ensuring the safety of power supply and avoiding the reduction of service life of equipment and the damage of equipment.

On the other hand, because the switch device includes the low-voltage switch group and the high-voltage switch group, the electrically-driven fracturing system can uniformly allocate a variety of electric devices requiring different voltage levels through the switch device, which has a high flexibility and reduces the difficulty of operation. In addition, the main power generation device may adopt energy-saving and environment-friendly gas turbine power generation device, which may use low-carbon fuels (such as natural gas, hydrogen, mixture containing hydrogen, mixture of gaseous and liquid fuels) as fuels, thereby reducing carbon emission while having a higher rated generation power.

It should be noted that, the working mode of the above-described electrically-driven fracturing system is merely an example to illustrate that the electrically-driven fracturing system provided by the embodiments of the present disclosure may improve fuel efficiency and fuel economy, and ensure the safety of power supply, and avoid the reduction of service life of equipment and damage of equipment; however, the working mode of the electrically-driven fracturing system according to the embodiments of the present disclosure includes, but is not limited to this.

In some examples, a ratio of the rated generation power of the main power generation device100to the rated generation power of the first auxiliary power generation device200is greater than 10, and a ratio of the rated output voltage of the main power generation device100to the rated output voltage of the first auxiliary power generation device200is greater than 10.

In some examples, the rated generation power of the main power generation device100is greater than 30 MW, the rated generation power of the first auxiliary power generation device200is less than 1 MW, the rated output voltage of the main power generation device100is greater than 10 kV, and the rated output voltage of the first auxiliary power generation device200is less than 1 kV.

For example, the rated output voltage of the main power generation device100may be 13.9 kV; the rated output voltage of the first auxiliary power generation device200may be 480 V.

In some examples, the main power generation device100can adopt a gas turbine power generation device or a gas turbine generator set with a rated generation power of more than 30 MW, and the first auxiliary power generation device200can adopt a piston power generation device or a piston generator set with a rated generation power of less than 1 MW. Of course, the embodiments of the present disclosure include the above examples, but are not limited thereto, and other types of power generation devices can also be used for the main power generation device and the first auxiliary power generation device.

In some examples, as shown inFIG.1, the main power generation device100includes a generator120and a power generation auxiliary device110, the power generation auxiliary device110is further connected to the output end of the low-voltage switch group310. Due to the large rated generation power the main power generation device, the main power generation device further needs to be equipped with power generation auxiliary devices that provide auxiliary functions (such as provide lubrication, heat dissipation, etc.) for the generator, in addition to the generator. In this case, through connecting the power generation auxiliary device to the output end of the low-voltage switch group, the electrically-driven fracturing system can ensure the normal operation of the power generation auxiliary device through the first auxiliary power generation device, while the main power generation device is shut off, such that, on the one hand, the damage of equipment caused by the power failure of the power generation auxiliary device can be avoided, and on the other hand, the rapid start of the main power generation device can be realized.

In some examples, as shown inFIG.1, the generator120supplies power to the fracturing motor420through the high-voltage switch group320, and the first auxiliary power generation device200supplies power to the fracturing auxiliary device410and the power generation auxiliary device110through the low-voltage switch group310, respectively. In this case, even if the generator120is abnormally shut down, the fracturing auxiliary device410and the power generation auxiliary device110can still work normally, so as to ensure that the electrically-driven fracturing device and the main power generation device can obtain corresponding lubrication and heat dissipation, thereby avoiding abnormal wear and damage of the electrically-driven fracturing device and the main power generation device, and further ensure the normal operation of the control devices in the electrically-driven fracturing device and the main power generation device, thereby preventing the electrically-driven fracturing device and the main power generation device from being out of control.

In some examples, as shown inFIG.1, the electrically-driven fracturing device400further includes a fracturing pump421and a transmission mechanism422. The power output shaft of the fracturing motor420is connected to the power input shaft of the fracturing pump421through the transmission mechanism422, and is configured to drive the fracturing pump421to pressurize the low-pressure fluid into high-pressure fluid.

In some examples, as shown inFIG.1, the fracturing auxiliary device410includes a first fan motor411, a first heat dissipation motor412and a first lubrication motor413; the first fan motor411is configured to drive the rotation of the fan in the electrically-driven fracturing device400, so as to provide ventilation air for the electrically-driven fracturing device400; the first heat dissipation motor412is configured to drive the rotation of the radiator impeller in the electrically-driven fracturing device400, so as to realize the function of heat dissipation; the first lubrication motor413is configured to drive the lubrication pump in the electrically-driven fracturing device400, so as to realize the function of lubrication. As such, the fracturing auxiliary device can realize various functions such as ventilation, heat dissipation, lubrication, and so on.

In some examples, as shown inFIG.1, the power generation auxiliary device110includes a second heat dissipation motor111and a second lubrication motor113; the second heat dissipation motor111is configured to drive the rotation of the radiator impeller in the main power generation device100; the second lubrication motor113is configured to drive the lubrication pump in the main power generation device100. As such, the power generation auxiliary device can realize various functions, such as heat dissipation, lubrication and so on.

In some examples, as shown inFIG.1, the power generation auxiliary device110further includes a power generation control device114. As such, the power generation control device can realize the functions, such as detection, feedback, and control of the main power generation device.

In some examples, as shown inFIG.1, the power generation auxiliary device110further includes a barring start system112, and the barring start system112is configured such that the main power generation device100is uniformly heated while starting and the main power generation device100is uniformly cooled while shutting down.

FIG.2is a schematic diagram of another electrically-driven fracturing system provided by an embodiment of the present disclosure. As shown inFIG.2, the electrically-driven fracturing system001may further include a sand blending device501, an instrument device502, a hydration device503, a liquid supply device504, and a sand supply device505; at least one of the sand blending device501, the instrument device502, the hydration device503, the liquid supply device504, and the sand supply device505is connected to the output end of the low-voltage switch group310. As such, the electrically-driven fracturing system can realize various types of auxiliary functions, such as the function of sand supply, the function of sand blending, and so on.

FIG.3is a schematic diagram of another electrically-driven fracturing system provided by an embodiment of the present disclosure. As shown inFIG.3, the power generation auxiliary device110may further include: a second fan motor115, which is configured to drive the rotation of the fan in the main power generation device100. As such, the power generation auxiliary device can realize the function of ventilation.

In some examples, as shown inFIG.3, the electrically-driven fracturing system001further includes an energy storage unit430. The energy storage unit430includes an input end and an output end, the output end of the energy storage unit430is connected to the fracturing auxiliary device410, and used for supplying power to the fracturing auxiliary device410. As such, when the main power generation device is powered off and the first auxiliary power generation device is also powered off, the energy storage unit can provide emergency power supply, so as to further improve the safety of power supply of the whole electrically-driven fracturing system.

In some examples, the energy storage unit430includes at least one of sodium-ion battery, lithium-ion battery, super capacitor, and hydrogen fuel cell. As such, the above-descried energy storage unit has fast charge and discharge capability and relatively large energy density. Of course, the embodiments of the present disclosure include but are not limited to this, and the above-described energy storage unit may also adopt other energy storage methods.

In some examples, as shown inFIG.3, the input end of the energy storage unit430is connected to the output end of the low-voltage switch group310, as such, the electrically-driven fracturing equipment can charge the energy storage unit through the first auxiliary power generation device.

In some examples, as shown inFIG.3, in some examples, the electrically-driven fracturing device further includes a fracturing frequency converter4200, one end of the fracturing frequency converter4200is connected to the output end of the high-voltage switch group320, and another end of the fracturing frequency converter4200is connected to the fracturing motor420. As such, through the above-described fracturing frequency converter, the fracturing motor can realize stepless speed regulation, continuous change of speed and enhancement of transmission efficiency.

In some examples, as shown inFIG.3, the fracturing auxiliary device410includes a first fan motor411, a first heat dissipation motor412, and a first lubrication motor413; the first fan motor411is configured to drive the rotation of the fan in the electrically-driven fracturing device400, so as to provide ventilation air for the electrically-driven fracturing device400; the first heat dissipation motor412is configured to drive the rotation of the radiator impeller in the electrically-driven fracturing device400, so as to realize the function of heat dissipation; the first lubrication motor413is configured to drive the lubrication pump in the electrically-driven fracturing device400, so as to realize the function of lubrication. As such, the fracturing auxiliary device can realize various functions such as ventilation, heat dissipation, lubrication and so on.

In some examples, as shown inFIG.3, the fracturing auxiliary device410further includes: a first frequency converter4110, a second frequency converter4120, and a third frequency converter4130. One end of the first frequency converter4110is connected to the output end of the low-voltage switch group310, and another end of the first frequency converter4110is connected to the first fan motor411. One end of the second frequency converter4120is connected to the output end of the low-voltage switch group310, and another end of the second frequency converter4120is connected to the first heat dissipation motor412. One end of the third frequency converter4130is connected to the output end of the low-voltage switch group310, and another end of the third frequency converter4130is connected to the first lubrication motor413. As such, the fracturing auxiliary device can realize stepless speed regulation, continuous change of speed and enhancement of transmission efficiency.

FIG.4is a schematic diagram of another electrically-driven fracturing system provided by an embodiment of the present disclosure. As shown inFIG.4, the electrically-driven fracturing system001further includes a second auxiliary power generation device431. The second auxiliary power generation device431is connected to the input end of the energy storage unit430. As such, the energy storage unit can be charged through the second auxiliary power generation device. As such, the electrically-driven fracturing system shown inFIG.4provides another method for charging the energy storage unit.

In some examples, the second auxiliary power generation device431includes a solar power generation panel. Of course, the embodiments of the present disclosure include but are not limited to this, and the second auxiliary power generation device can also be other types of power generation devices.

It is noted that, unlike the traditional electrically-driven fracturing system which can update and check the equipment status, update the control program, etc., only through external power generation or power grid, when the electrically-driven fracturing system includes the energy storage unit and the solar power generation panel, the electrically-driven fracturing system may have portions or all of control devices online in real time, wake up the control devices through wireless or wired mode, thereby obtaining more functions of the control devices (such as updating the control program, reading the stored data of the control device, obtaining the image of surrounding environment, obtaining the real-time location of the equipment, etc.), so as to make the maintenance and inspection of the equipment more convenient and no longer rely solely on external power supply.

In some examples, as shown inFIG.4, the fracturing auxiliary device410further includes: an illuminating system414, and the illuminating system414is configured to provide light for the electrically-driven fracturing system.

In some examples, as shown inFIG.4, the fracturing auxiliary device410further includes: a fracturing control device415. As such, the fracturing control device can realize the functions of detection, feedback, and control of the electrically-driven fracturing device.

FIG.5is another electrically-driven fracturing system provided by an embodiment of the present disclosure. As shown inFIG.5, the electrically-driven fracturing system001further includes a fracturing transformer440; the fracturing transformer440includes an input end, a first output end and a second output end; the input end of the fracturing transformer440is connected to the output end of the high-voltage switch group320; the first output end of the fracturing transformer440is connected to the fracturing auxiliary device410; the second output end of the fracturing transformer440is connected to the fracturing frequency converter4200. As such, the electrically-driven fracturing system can flexibly increase the voltage through disposing the above-described fracturing transformer, so as to satisfy various voltage conditions required for the operations of different devices that need power supply, and can also reduce the voltage to supply power to the fracturing auxiliary devices. As such, when the first auxiliary power generation device breaks down, the safety of power supply of the fracturing auxiliary device can be maintained through the main power generation device and the fracturing transformer.

In some examples, as shown inFIG.5, the fracturing auxiliary device410further includes: an electric conversion component4150and a fracturing control device415; the electric conversion component includes a transformer4151and an inverter4152; one end of the electric conversion component4150is connected to the output end of the low-voltage switch group310, and another end of the electric conversion component4150is connected to the fracturing control device415; the transformer4151is configured to convert a first voltage output by the output end of the low-voltage switch group310into a second voltage, and the inverter4152is configured to convert an alternating current output by the output end of the low-voltage switch group310into a direct current. As such, the electric conversion component4150can convert the alternating current output by the fracturing transformer440into direct current, thereby driving the control device415that need to be driven by direct current.

In some examples, the second voltage is less than the first voltage, the second voltage is 24 V, and the first voltage is 480 V.

For example, the fracturing control device415includes modules, such as input, output, logic control, communication, storage, sensing and detection; communication with the remote control system can also be achieved through the fracturing control device415. As such, the remote control system can obtain the operating parameters of the above-described devices through the fracturing control device, and remotely operate and control the corresponding devices according to these operating parameters. Of course, the embodiments of the present disclosure include but are not limited to this.

In some examples, the above-described communication connection includes communication connection through wired connection (e.g., wire, optical fiber, etc.) and communication connection through wireless connection (e.g., WiFi, mobile network).

In some examples, the above-described fracturing control device and power generation control device may include a storage medium and a processor; the storage medium is used for storing computer programs; the processor is used for executing computer programs in the storage medium to realize various control operations.

For example, the above-described storage medium may be volatile memory and/or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and/or cache memory (cache), and so on. The non-volatile memory may include, for example, read only memory (ROM), hard disk, flash memory, and so on.

For example, the above-described processor may be a central processing unit (CPU) or other forms of processing devices with data processing capability and/or instruction executing capability, such as microprocessor, programmable logic controller (PLC), etc.

FIG.6is a schematic diagram of another electrically-driven fracturing system provided by an embodiment of the present disclosure. The electrically-driven fracturing system001may be provided with a plurality of electrically-driven fracturing devices400, and high-voltage power and low-voltage power are respectively transmitted for each electrically-driven fracturing device400through the switch device300. As such, the electrically-driven fracturing system can achieve large displacement.

The following aspects should be noted:

(1) The drawings of the embodiments of the present disclosure are merely related to the structures that are related to the embodiments of the present disclosure, while other structures can refer to the common design.

(2) The features in the same embodiment and different embodiments of the present disclosure can be combined with each other without contradiction.

The above merely illustrates the specific embodiments of the disclosure, but the claimed scope of the disclosure is not limited thereto. Any variations or substitutions that may be readily achieved by person skilled in the art based on the scope of the disclosure should be included within the scope of the present disclosure. Therefore, the scope of the present disclosure should be subject to the scope of the claims.