WO2021218590A1 - Electric fracturing operation system - Google Patents

Abstract

An electric fracturing operation system, comprising a water storage device, a fracturing device, a blending device and a sand mixing device, wherein the water storage device is a flexible water tank; the flexible water tank is connected to the blending device; the fracturing device is comprised of several electrically-driven fracturing pumps; the blending device is used for blending fracturing base fluid and storing same in a fluid preparing tank; an inlet of the sand mixing device is connected to the fluid preparing tank and a sand storage and conveying tank; an outlet of the sand mixing device is connected to inlets of all the electrically-driven fracturing pumps through a low-pressure manifold; and outlets of all the electrically-driven fracturing pumps are connected to a well head through a high-pressure manifold. The operation system can solve the problem of the large size and heavy weight of existing fracturing units, is economical and environmentally friendly, can significantly reduce fracturing construction costs, and can reduce the number of fracturing pumps, therefore reducing the number of high-pressure manifolds and the occupied area.

Description

Electric fracturing operation system

This application claims the priority of an invention patent application filed with the Chinese Patent Office on April 26, 2020 with the application number 202010338831.5 and the invention title "an electric fracturing operation system", the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the technical field of oil and gas field fracturing, in particular to an electric fracturing operation system.

Background technique

Hydraulic fracturing is a major production stimulation measure in the exploration and development of oil and gas fields. It mainly uses fracturing pumps to inject fracturing fluid into the wellbore under high pressure to create fractures in the formation and improve the flow environment of oil underground, thereby increasing the production of oil wells. After the fracturing operation is completed, the fracturing fluid base fluid flows back to the ground, and the fracturing proppant is left in the formation cracks to prevent the cracks from closing, and a large amount of oil and gas enter the wellbore through the cracks to be exploited.

The current fracturing construction equipment is mainly composed of fracturing trucks, sand mixers, instrument trucks, manifolds and auxiliary equipment. During construction, the sand mixer mixes slippery water, proppant and various additives into fracturing fluid, and then supplies multiple fracturing trucks through the connecting manifold; the fracturing truck pressurizes the fracturing fluid and collects it through the high-pressure manifold Then it is injected into the bottom of the well; the instrument car monitors, analyzes and records the entire operation process.

The current fracturing operation mode has the following shortcomings: (1) The fracturing unit is large in size and weight: the diesel engine-driven gearbox drives the fracturing pump via the drive shaft, which is large in size, heavy in weight, limited in transportation, and low in power density; (2) Not environmentally friendly: Diesel engine-driven fracturing equipment (fracturing trucks and sand mixing trucks) will produce engine exhaust gas pollution and noise pollution during the operation of the well site. The noise exceeds 105dBA, which seriously affects the normal life of surrounding residents; (3) Uneconomical: For fracturing equipment driven by diesel engines, the initial purchase cost of the equipment is relatively high, the unit power consumption cost is high when the equipment is running, and the daily maintenance costs of the engine and gearbox are also high; (4) Large area: diesel engine The fracturing trucks driven by small power and large number result in a large area; (5) Multiple manifolds and high safety risks: The fracturing trucks driven by diesel engines are small in power and large in number, resulting in a large number of connected high-pressure manifolds and complex lines. , High-pressure manifold vibration is obvious, and it is easy to damage or even burst and other accidents, which threaten the safety of equipment and personnel; (6) Inconvenient storage of fracturing water: a large amount of clean water is required in hydraulic fracturing. The use of fixed-capacity water tanks has a long construction period, high cost, and difficulty in restoring the ground. The fixed-capacity water tanks are large in number and occupy a large area.

Summary of the invention

The purpose of the present invention is: in order to overcome the shortcomings of the current hydraulic fracturing operation mode, an electric fracturing operation system is provided, which can improve the problem of large volume and heavy weight of the existing fracturing unit, is economical and environmentally friendly, and can significantly reduce Fracturing construction costs, reducing the number of fracturing pumps, while reducing the number of high-pressure high-pressure manifolds, and reducing floor space.

In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

An electric fracturing operation system, including fracturing equipment, water storage equipment, mixing equipment, sand mixing equipment, liquid mixing tank and sand storage and transportation tank. The fracturing equipment includes several electric drive fracturing pumps and pressure In the fracturing frequency conversion room, the water storage equipment is connected to the mixing equipment, and the mixing equipment is used for mixing and storing the fracturing base fluid in the mixing tank. The mixing tank and the sand mixing equipment The inlet is connected or connected to the inlet of the fracturing equipment, the sand storage tank is connected to the inlet of the sand mixing equipment, and the outlet of the sand mixing equipment is connected to the inlet of the fracturing equipment through a low pressure manifold The outlet of the fracturing equipment is connected to the wellhead through a high-pressure manifold.

The invention realizes fracturing by setting the electric drive fracturing pump, the fracturing frequency conversion room controls the speed of the electric drive fracturing pump, the water storage device stores the clean water in the fracturing operation, and the mixing equipment uses the clean water in the water storage device to perform The fracturing base fluid is mixed and stored in the mixing tank, and the fracturing base fluid in the mixing tank and the fracturing sand in the sand storage and transportation tank are transported to the sand mixing equipment. The fracturing fluid is distributed to the electric fracturing pumps through the low-pressure pipeline. After the low-pressure fracturing fluid is pressurized into the high-pressure fracturing fluid by the electric fracturing pump, the high-pressure fluid is forced into the formation through the high-pressure manifold and wellhead, so that Fractures are generated in the formation to connect natural fractures in the formation, improve oil and gas passages, and increase oil and gas production; in addition, when the fluid distribution tank is connected to the inlet of the electric drive fracturing pump, the configured fracturing base can be directly hydraulically injected into the formation to achieve no The operation process of fracturing sand: Compared with diesel-driven fracturing, the electric drive fracturing pump is small in size, low in noise, and has no waste gas emission pollution. Compared with diesel, the use cost is lower. At the same time, the electric drive fracturing pump can be increased. Power to reduce the number of fracturing pumps required, while reducing the number of high-pressure high-pressure manifolds and reducing the floor space.

As a preferred solution of the present invention, the power source of the electric fracturing operation system is a public power grid or a power generation device. The adoption of two power source forms is beneficial to improve the adaptability of the electric fracturing operation system to the operating environment.

As a preferred solution of the present invention, the water storage device is a flexible water tank group. By setting up a flexible water tank to store the clean water in the fracturing operation, it has a large capacity several times that of a conventional water tank, while it occupies less area than a conventional water tank, and can be folded and transported to greatly reduce transportation costs.

As a preferred solution of the present invention, the electric energy provided by the public grid or power generation device enters the high-voltage power distribution room, and the high-voltage power distribution room distributes the electric energy to water storage equipment and/or fracturing equipment and/or mixing equipment and/or Or sand mixing equipment and/or liquid mixing tank and/or sand storage and transportation tank and/or low pressure manifold and/or high pressure manifold. Electric energy is distributed to various electrical equipment through the high-voltage power distribution room.

As a preferred solution of the present invention, the electric fracturing operation system further includes a command and control center, the command and control center is powered by the high-voltage power distribution room, and the command and control center respectively controls the water storage equipment and the fracturing equipment , Mixing equipment, sand mixing equipment, liquid mixing tank, sand storage and transportation tank, low pressure manifold and high pressure manifold work. In this way, the coordinated work of various devices can be controlled through the command and control center.

As a preferred solution of the present invention, the water storage equipment and/or fracturing equipment and/or mixing equipment and/or sand mixing equipment and/or liquid mixing tank and/or sand storage and transportation tank and/or low pressure manifold And/or the high-voltage manifold is electrically driven. In this way, full electric drive can be realized, without hydraulic drive.

As a preferred solution of the present invention, the fracturing equipment and mixing equipment are vehicle-mounted or skid-mounted. The fracturing equipment and the mixing equipment adopt two installation methods: vehicle-mounted or skid-mounted, which can adapt to different operating environments.

As a preferred solution of the present invention, each fracturing frequency conversion room corresponds to one or two electric drive fracturing pumps. In actual use, each fracturing variable frequency room can control 1-2 electric drive fracturing pumps, which is beneficial to reduce the space occupied by the fracturing variable frequency room.

As a preferred solution of the present invention, the electric drive fracturing pump is a three-cylinder or five-cylinder plunger pump.

As a preferred solution of the present invention, the power generation device is one of a gas generator set, a diesel generator set and a turbine generator set.

As a preferred solution of the present invention, there are several water storage devices, and all the water storage devices are connected in series with the mixing device. By combining multiple water storage devices in series, the number of water storage devices can be increased or decreased according to the water volume, and the storage of fracturing clean water can be realized together, making the use more flexible and convenient.

As a preferred solution of the present invention, there are several liquid mixing tanks, and all liquid mixing tanks are connected in series with the sand mixing equipment. Through the series combination of multiple liquid distribution tanks, the number of liquid distribution tanks can be increased or decreased according to the amount of fracturing base fluid after mixing, and the use is more flexible and convenient.

As a preferred solution of the present invention, the electric fracturing operation system further includes an acid tank and an acid supply device. The acid tank supplies acid to the fracturing device through the acid supply device, and the acid supply device is supplied by the acid The high-voltage power distribution room is powered by electricity and is controlled by the command and control center.

In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

1. The present invention realizes fracturing by setting the electric drive fracturing pump, the fracturing frequency conversion room controls the speed of the electric drive fracturing pump, the water storage equipment stores the clean water in the fracturing operation, and the mixing equipment uses the water storage equipment The clean water is mixed with the fracturing base fluid and stored in the mixing tank, and the fracturing base fluid in the mixing tank and the fracturing sand in the sand storage and transportation tank are transported to the sand mixing equipment, and the sand mixing equipment will be configured. The fracturing fluid is distributed to the electric fracturing pumps through low-pressure pipelines. After the low-pressure fracturing fluid is pressurized into high-pressure fracturing fluid by the electric-drive fracturing pump, the high-pressure fluid is forced into the formation through the high-pressure manifold and wellhead. In this way, fractures are generated in the formation, communicating with natural fractures in the formation, improving oil and gas channels, and increasing oil and gas production; in addition, when the fluid distribution tank is connected to the inlet of the electric drive fracturing pump, the configured fracturing base can be directly hydraulically inserted into the formation to achieve Operation process without fracturing sand;

2. Compared with diesel-driven fracturing pumps, electric fracturing pumps are smaller in size, less noise, and have no exhaust emission pollution. Compared with diesel, the use cost is lower. At the same time, the power of electric fracturing pumps can be increased to reduce the cost. The number of fracturing pumps required, while reducing the number of high-pressure-grade and high-pressure manifolds, and reducing floor space.

Description of the drawings

Figure 1 is a schematic diagram of the electric fracturing operation system in the present invention.

Figure 2 is a schematic diagram of another electric fracturing operation system in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Example 1

This embodiment provides an electric fracturing operation system;

As shown in Figure 1, the electric fracturing operation system in this embodiment includes fracturing equipment, water storage equipment, mixing equipment, sand mixing equipment, liquid mixing tanks, and sand storage and transportation tanks. The fracturing equipment includes Several electric drive fracturing pumps and fracturing frequency conversion rooms. The water storage equipment is connected to the mixing equipment. The mixing equipment is used to mix and mix the fracturing base fluid and store it in the mixing tank. The liquid tank is connected to the inlet of the sand mixing device or connected to the inlet of the fracturing device, the sand storage tank is connected to the inlet of the sand mixing device, and the outlet of the sand mixing device passes through a low pressure pipe The manifold is connected with the inlet of the fracturing equipment, and the outlet of the fracturing equipment is connected with the wellhead through a high-pressure manifold.

The invention realizes fracturing by setting the electric drive fracturing pump, the fracturing frequency conversion room controls the speed of the electric drive fracturing pump, the water storage device stores the clean water in the fracturing operation, and the mixing equipment uses the clean water in the water storage device to perform The fracturing base fluid is mixed and stored in the mixing tank, and the fracturing base fluid in the mixing tank and the fracturing sand in the sand storage and transportation tank are transported to the sand mixing equipment. The fracturing fluid is distributed to the electric fracturing pumps through the low-pressure pipeline. After the low-pressure fracturing fluid is pressurized into the high-pressure fracturing fluid by the electric fracturing pump, the high-pressure fluid is forced into the formation through the high-pressure manifold and wellhead, so that Fractures are generated in the formation to connect natural fractures in the formation, improve oil and gas passages, and increase oil and gas production; in addition, when the fluid distribution tank is connected to the inlet of the electric drive fracturing pump, the configured fracturing base can be directly hydraulically injected into the formation to achieve no The operation process of fracturing sand: Compared with diesel-driven fracturing, the electric drive fracturing pump is small in size, low in noise, and has no waste gas emission pollution. Compared with diesel, the use cost is lower. At the same time, the electric drive fracturing pump can be increased. Power to reduce the number of fracturing pumps required, while reducing the number of high-pressure high-pressure manifolds and reducing the floor space.

In this embodiment, the power source of the electric fracturing operation system is a public power grid or a power generation device. The adoption of two power source forms is beneficial to improve the adaptability of the electric fracturing operation system to the operating environment. Specifically, the public power grid can be used directly in some places with relatively complete power facilities, and when there is no public power grid in some remote places, the power generation device can be used to generate power without being restricted by the operating environment. Preferably, the power generation device is one of a gas generator set, a diesel generator set and a turbine generator set.

In this embodiment, the water storage device is a flexible water tank group. By setting up a flexible water tank to store the clean water in fracturing operations, it has a large capacity several times that of a conventional water tank, and at the same time, it occupies less area than a conventional water tank, and can be folded and transported to greatly reduce transportation costs.

In this embodiment, the electric energy provided by the public grid or power generation device enters the high-voltage power distribution room, and the high-voltage power distribution room distributes the electric energy to water storage equipment and/or fracturing equipment and/or mixing equipment and/or mixing equipment. Sand equipment and/or liquid distribution tank and/or sand storage and transportation tank and/or low pressure manifold and/or high pressure manifold. The electric pole is connected to the public power grid or the power generation device to generate electricity. The electric energy is distributed to various electrical equipment through the high-voltage power distribution room, and the speed of the electric drive fracturing pump is controlled through the fracturing frequency conversion room.

In this embodiment, the electric fracturing operation system further includes a command and control center, the command and control center is powered by the high-voltage power distribution room, and the command and control center respectively controls the water storage equipment, fracturing equipment, and mixing equipment. Work with equipment, sand mixing equipment, liquid tanks, sand storage tanks, low-pressure manifolds and high-pressure manifolds. In this way, the coordinated work of various equipment can be controlled through the command and control center, and the entire hydraulic fracturing system can be monitored at the same time.

In this embodiment, the water storage equipment and/or fracturing equipment and/or mixing equipment and/or sand mixing equipment and/or liquid mixing tank and/or sand storage and transportation tank and/or low pressure manifold and/or Or the high-voltage manifold is electrically driven. In this way, full electric drive can be realized, without hydraulic drive.

In this embodiment, the fracturing equipment and mixing equipment are vehicle-mounted or skid-mounted. The fracturing equipment and the mixed equipment adopt two installation methods: car-mounted or skid-mounted, which can adapt to different operating environments and facilitate the transportation and transfer of equipment. Specifically, when the working position is in good road conditions, the vehicle installation method can be adopted; when the working position is in a snowy area, the skid installation method can be adopted.

In this embodiment, each of the fracturing variable frequency houses corresponds to one or two of the electric drive fracturing pumps. In actual use, each fracturing frequency conversion room can control 1-2 electric drive fracturing pumps.

In this embodiment, the electric drive fracturing pump is a three-cylinder or five-cylinder plunger pump. Preferably, the power of the electric drive fracturing pump is greater than or equal to 4500HP. The power of the fracturing pump can be made larger, which can replace multiple traditional fracturing pump trucks, greatly reducing the area occupied by the well site during fracturing operations, and greatly reducing the connecting pipelines between fracturing equipment.

In this embodiment, there are several water storage devices, and all the water storage devices are connected in series with the mixing device. By combining multiple water storage devices in series, the number of water storage devices can be increased or decreased according to the water volume, and the storage of fracturing clean water can be realized together, making the use more flexible and convenient.

In this embodiment, there are several liquid mixing tanks, and all liquid mixing tanks are connected in series with the sand mixing equipment. By combining multiple fluid distribution tanks in series, the number of fluid distribution tanks can be increased or decreased according to the amount of fracturing base fluid after mixing, making the use more flexible and convenient.

In this embodiment, the liquid distribution tank group, the flexible water tank group, the electric drive sand mixing equipment, and the sand storage and transportation tank are set in the fracturing fluid preparation area. The fracturing fluid is configured in the fracturing fluid preparation area, and the fracturing fluid preparation area It is a low-pressure area, and the high-pressure area is located outside this area, which optimizes the layout of the operating system equipment and improves the safety of operations.

Example 2

As shown in Figure 2, this embodiment is based on Example 1. The electric fracturing operation system further includes an acid tank and an acid supply device. The acid tank supplies the fracturing equipment through the acid supply device. Acid, the acid supply equipment is powered by the high-voltage power distribution room and controlled by the command and control center.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the principle of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (13)

1. An electric fracturing operation system, which is characterized in that it includes fracturing equipment, water storage equipment, mixing equipment, sand mixing equipment, liquid mixing tank, and sand storage and transportation tank. The fracturing equipment includes several electric drive pressure The fracturing pump and the fracturing frequency conversion room, the water storage equipment is connected with the mixing equipment, and the mixing equipment is used for mixing the fracturing base fluid and storing it in the mixing tank, and the mixing tank is connected to the mixing equipment. The inlet of the sand mixing device is connected or connected to the inlet of the fracturing device, the sand storage tank is connected to the inlet of the sand mixing device, and the outlet of the sand mixing device is connected to the pressure through a low pressure manifold. The inlet of the fracturing device is connected, and the outlet of the fracturing device is connected to the wellhead through a high-pressure manifold.
2. The electric fracturing operation system according to claim 1, wherein the power source of the electric fracturing operation system is a public power grid or a power generation device.
3. The electric fracturing operation system according to claim 1, wherein the water storage equipment is a flexible water tank group.
4. The electric fracturing operation system according to claim 2, wherein the electric energy provided by the public power grid or the power generation device enters a high-voltage power distribution room, and the high-voltage power distribution room distributes the electric energy to water storage equipment and/or pressure Cracking equipment and/or mixing equipment and/or sand mixing equipment and/or liquid mixing tank and/or sand storage and transportation tank and/or low pressure manifold and/or high pressure manifold.
5. The electric fracturing operation system according to claim 4, wherein the electric fracturing operation system further comprises a command and control center, and the command and control center is powered by the high-voltage power distribution room, and the command and control center respectively Control the work of the water storage equipment, fracturing equipment, mixing equipment, sand mixing equipment, liquid mixing tank, sand storage and transportation tank, low pressure manifold and high pressure manifold.
6. The electric fracturing operation system according to claim 5, wherein the water storage equipment and/or fracturing equipment and/or mixing equipment and/or sand mixing equipment and/or liquid tank and/or storage The sand conveying tank and/or the low-pressure manifold and/or the high-pressure manifold are electrically driven.
7. The electric fracturing operation system according to any one of claims 1-6, wherein the fracturing equipment and mixing equipment are vehicle-mounted or skid-mounted.
8. The electric fracturing operation system according to any one of claims 1 to 6, wherein each of the fracturing variable frequency houses corresponds to one or two electric drive fracturing pumps.
9. The electric fracturing operation system according to any one of claims 1-6, wherein the electric drive fracturing pump is a three-cylinder or five-cylinder plunger pump.
10. The electric fracturing operation system according to any one of claims 2-6, wherein the power generation device is one of a gas generator set, a diesel generator set and a turbine generator set.
11. The electric fracturing operation system according to claim 1, wherein there are several water storage devices, and all the water storage devices are connected in series with the mixing device.
12. The electric fracturing operation system according to claim 1 or 5, wherein there are several liquid mixing tanks, and all liquid mixing tanks are connected in series with the sand mixing equipment.
13. The electric fracturing operation system according to claim 5, further comprising an acid tank and acid supply equipment, the acid tank supplies acid to the fracturing equipment through the acid supply equipment, and the acid supply equipment It is powered by the high-voltage power distribution room and controlled by the command and control center.

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