WO2021081798A1

WO2021081798A1 - Single-motor, single-pump electric drive fracturing semitrailer

Info

Publication number: WO2021081798A1
Application number: PCT/CN2019/114304
Authority: WO
Inventors: 崔树桢; 张日奎; 常胜
Original assignee: 烟台杰瑞石油装备技术有限公司
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-05-06
Also published as: CA3159593A1

Abstract

Disclosed is a single-motor, single-pump electric drive fracturing semitrailer, comprising a semitrailer body (1), a plunger pump (5), a radiator (6), a power supply unit and an electric motor (4), wherein the power supply unit, the electric motor (4), the radiator (6) and the plunger pump (5) are integrated on the semitrailer body (1); one electric motor (4) is provided; one radiator (6) is provided; one plunger pump (5) is provided; the power supply unit provides electric power to the electric motor (4); the electric motor (4) is connected to the plunger pump (5); and the radiator (6) is used for cooling lubricating oil of the plunger pump (5). The semitrailer has both functions of power supply and fracturing, without the use of a power supply semitrailer and a fracturing semitrailer as a set, such that the semitrailer is more flexible in actual use, and the well site layout of an oil and gas field is greatly optimized; in addition, the semitrailer is convenient to transport with quick wiring and installation, and uses electric drive fracturing which, compared with diesel-driven fracturing, is low in noise, has no waste gas emission pollution, and is low in usage cost.

Description

Single-unit single-pump electric drive fracturing semi-trailer

Technical field

The invention relates to the technical field of electric drive fracturing equipment, in particular to a single-unit single-pump electric drive fracturing semi-trailer.

Background technique

In the global oil and gas field fracturing operation sites, there are two main power driving methods for plunger pumps:

The first is that the diesel engine is connected to the gearbox to drive the fracturing plunger pump via the drive shaft. In other words, the power source is a diesel engine, the transmission is a gearbox and a drive shaft, and the actuator is a plunger pump. .

The configuration mode has the following disadvantages:

(1) Large volume and weight: The diesel engine drives the gearbox to drive the plunger 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: The diesel engine-driven fracturing equipment 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 cost of fuel consumption per unit power during the operation of the equipment is high, and the daily maintenance costs of the engine and gearbox are also high.

The second is that the motor is connected to the drive shaft or the coupling to drive the plunger pump. In other words, the power source is an electric motor, the transmission device is a transmission shaft or coupling, and the actuator is a plunger pump, which is an electric drive fracturing.

Electric drive fracturing is relatively widely used in some places with relatively complete power facilities. Existing electric drive fracturing equipment is usually equipped with special power supply equipment to provide driving power. Power supply equipment and electric drive fracturing The equipment is usually one-to-one, or a high-power power supply equipment drags several electric fracturing equipment (hereinafter referred to as one-to-many), but whether it is one-to-one or one-to-many, in actual use at the well site, It takes too much time to arrange the electric drive fracturing equipment and power supply equipment (that is, the electric drive fracturing equipment and the power supply equipment need to be used together); it is also necessary to connect each electric drive fracturing equipment to the power supply equipment to make The electric drive fracturing equipment enters the working state; the above processes are relatively time-consuming and labor-intensive, and there are many connection cables between the equipment, which is relatively cumbersome.

Therefore, there is an urgent need for an electric drive fracturing equipment that is economical, environmentally friendly, small in size and simple in connection.

Summary of the invention

The purpose of the present invention overcomes the shortcomings of the prior art and provides a single-unit single-pump electric drive fracturing semi-trailer, which optimizes the integration of the traditional power supply semi-trailer and the fracturing semi-trailer, and realizes that a semi-trailer has both power supply and fracturing This function does not require power supply semi-trailer and fracturing semi-trailer to be used as a complete set. It is more flexible in actual use, greatly optimizing the layout of oil and gas field wellsites; convenient transportation; only a set of high-voltage cables connected to high-voltage power supply can reach the working state, and the wiring installation is faster ; Compared with diesel-driven fracturing, the use of electric drive fracturing has low noise and no exhaust emission pollution; the driving source is electricity, which is cheaper than diesel. The use of five-cylinder plunger pumps above 5000hp, especially when 7000hp, greatly increases the output power of the single-unit single-pump electric drive fracturing semi-trailer, and on the premise that the output power of the single-vehicle is large, the power density per unit area of the well site Also greatly improved. The power end shell of the five-cylinder plunger pump adopts an integral welded structure, which makes the structure of the power end assembly stronger, better support stability, and can reduce the vibration of the whole pump. The distance between the cylinders of the five-cylinder plunger pump is 13-14in, which provides protection for the high-power output of the five-cylinder plunger pump. The high-power five-cylinder plunger pump can effectively solve the narrow area and required fracturing of the shale gas fracturing well site. The problem of more equipment can reduce the use of equipment and facilitate the layout of the well site. The multi-point support design for the crankcase, crosshead box and hydraulic end assembly can improve the support strength of the five-cylinder plunger pump, reduce vibration, better ensure high-load operation, and run more smoothly.

The purpose of the present invention is achieved through the following technical measures: a single-unit single-pump electric drive fracturing semi-trailer, including a semi-trailer body, a plunger pump, a radiator, a power supply unit and a motor, the power supply unit, the motor, and the radiator It is integrated with the plunger pump on the semi-trailer body, the motor is one, the radiator is one, and the plunger pump is one. The power supply unit provides power to the motor, the motor is connected to the plunger pump, and the radiator is the plunger pump. Lubricating oil provides cooling.

Further, the power supply unit includes a transformer unit and a variable frequency unit, the variable frequency unit is connected to the transformer unit, the transformer unit is provided at one end of the semi-trailer body close to the motor, and the variable frequency unit is provided at the end of the semi-trailer body. Gooseneck.

Further, the transformer unit has a cabin structure, and a high-voltage switch and a transformer are arranged in the cabin, and the high-voltage switch is connected to the transformer.

Further, the frequency conversion unit is a cabin structure, and a frequency converter is arranged in the frequency conversion unit cabin, the input end of the frequency converter is connected to the voltage transformation unit, and the output end of the frequency converter is connected to the motor.

Further, the plunger pump is a five-cylinder plunger pump. The five-cylinder plunger pump includes a power end assembly, a hydraulic end assembly, and a reduction box assembly. One end of the power end assembly is connected to the hydraulic end assembly. The end assembly is connected. The other end of the power end assembly is connected to the reduction box assembly. The power end assembly includes a crankcase, a crosshead case and a spacer, the crankcase, the crosshead case and The spacers are connected in sequence.

Further, the stroke of the five-cylinder plunger pump is 10" or more.

Further, the power of the five-cylinder plunger pump is above 5000 hp.

Further, the power of the five-cylinder plunger pump is 7000 hp.

Further, the cylinder spacing of the five-cylinder plunger pump is 13-14 inches.

Further, the crankcase body and the crosshead box body are integrally welded to form a power end shell, and the power end shell is connected to the spacer frame. The power end shell includes a vertical plate, a bearing seat, a front end plate, and a rear cover plate. , The bottom plate, the support plate and the upper cover plate, the number of the vertical plates is 6, the number of the bearing seats is 6, one vertical plate is connected to a bearing seat, and the 6 vertical plates are arranged in parallel to form a power end cavity, A bottom plate is installed at the bottom of the power end cavity, an upper cover plate is installed on the top of the power end cavity, a front end plate is installed at the front end of the power end cavity, and a front end plate is installed at the rear end of the power end cavity The back cover is provided with a supporting plate between two adjacent vertical plates arranged in parallel.

Further, a crankshaft support body is provided at the bottom of the crankcase body, and the crankshaft support body is used to support the crankshaft case body.

Further, a crosshead support body is provided at the bottom of the crosshead box body, and the crosshead support body is used to support the crosshead box body.

Further, the bottom of the spacer is provided with a hydraulic support body, and the hydraulic support body is used to support the hydraulic end assembly.

Compared with the prior art, the present invention has the beneficial effect of optimizing the integration of traditional power supply semi-trailer and fracturing semi-trailer, realizing that one semi-trailer has the functions of power supply and fracturing at the same time, without the need for power supply semi-trailer and fracturing. The semi-trailer is used as a complete set, which is more flexible in actual use, greatly optimizing the layout of oil and gas field wellsites; convenient transportation; only a set of high-voltage cables can be connected to high-voltage power supply to reach the working state, and the wiring installation is faster; the electric drive fracturing is compared with diesel Drive fracturing, with low noise and no exhaust emission pollution; the drive source is electricity, which is cheaper than diesel. The use of five-cylinder plunger pumps above 5000hp, especially when 7000hp, greatly increases the output power of the single-unit single-pump electric drive fracturing semi-trailer, and on the premise that the output power of the single-vehicle is large, the power density per unit area of the well site Also greatly improved. The power end shell of the five-cylinder plunger pump adopts an integral welded structure, which makes the structure of the power end assembly stronger, better support stability, and can reduce the vibration of the whole pump. The distance between the cylinders of the five-cylinder plunger pump is 13-14in, which provides protection for the high-power output of the five-cylinder plunger pump. The high-power five-cylinder plunger pump can effectively solve the small area of shale gas fracturing well site and the required fracturing. The problem of more equipment can reduce the use of equipment and facilitate the layout of the well site. The multi-point support design for the crankcase, crosshead box and hydraulic end assembly can improve the support strength of the five-cylinder plunger pump, reduce vibration, and better ensure high-load operation and more stable operation.

The present invention will be described in detail below with reference to the drawings and specific embodiments.

Description of the drawings

Figure 1 is a schematic diagram of a single-unit single-pump electric drive fracturing semi-trailer.

Figure 2 is a schematic diagram of the structure of a five-cylinder plunger pump.

Figure 3 is a schematic diagram of the structure of the power end housing.

Among them, 1. Semi-trailer body, 2. Frequency conversion unit, 3. Transformer unit, 4. Electric motor, 5. Plunger pump, 6. Radiator, 7. Power end assembly, 8. Gearbox assembly, 9. Hydraulic end assembly, 10. Drive flange, 11. Power end housing, 12. Crankshaft support, 13. Crosshead support, 14. Hydraulic support, 15. Rear cover, 16. Vertical plate, 17. Bearing seat, 18. Bottom plate, 19. Support plate, 20. Front end plate, 21. Upper cover plate.

Detailed ways

Embodiments, as shown in Figures 1 to 3, a single-machine single-pump electric drive fracturing semi-trailer, including a semi-trailer body 1, a plunger pump 5, a radiator 6, a power supply unit and an electric motor 4. The power supply unit, the electric motor 4. The radiator 6 and the plunger pump 5 are integrated on the semi-trailer body 1, the motor 4 is one unit, the radiator 6 is one unit, and the plunger pump 5 is one unit. The power supply unit provides electric power for the motor 4, and the motor 4 is connected with The plunger pump 5 is connected, and the radiator 6 provides cooling for the lubricating oil of the plunger pump 5. The power supply unit includes a transformer unit 3 and a inverter unit 2. The inverter unit 2 is connected to the transformer unit 3, and the transformer unit 3 is provided at one end of the semi-trailer body 1 close to the motor 4, and the inverter unit 2 is provided with On the gooseneck of the semi-trailer body 1. The number of axles of the semi-trailer body 1 is four. An electrical control cabinet can also be provided on the semi-trailer to realize local control of the semi-trailer. The traditional power supply semi-trailer and fracturing semi-trailer are optimized and integrated to realize that a semi-trailer has the functions of power supply and fracturing at the same time. Compared with the existing power supply semi-trailer and fracturing semi-trailer, the wiring is relatively cumbersome when the power supply semi-trailer supports multiple fracturing semi-trailers. It takes a lot of time to arrange the semi-trailer and multiple fracturing semi-trailers, etc.). When used on site, the power supply semi-trailer and the fracturing semi-trailer are transported separately, moved separately, and then wired and installed separately. This single-pump electric drive The fracturing semi-trailer only needs to be moved once, and only a set of high-voltage cables are connected to the high-voltage power supply to realize the working state. Compared with diesel-driven fracturing, electric drive fracturing has lower noise and no exhaust emission pollution; the driving source is electricity, which is cheaper than diesel.

The transformer unit 3 has a cabin structure, and a high-voltage switch and a transformer are arranged in the cabin, and the high-voltage switch is connected to the transformer. The frequency conversion unit 2 has a cabin structure, and a frequency converter is arranged in the cabin of the frequency conversion unit 2, and the input end of the frequency converter is connected to the voltage transformation unit 3. Specifically, the input end of the frequency converter is connected to the transformer, and the The output terminal of the frequency converter is connected with the motor 4.

The plunger pump 5 is a five-cylinder plunger pump, the five-cylinder plunger pump includes a power end assembly 7, a hydraulic end assembly 9 and a reduction box assembly 8, one end of the power end assembly 7 and The hydraulic end assembly 9 is connected, and the other end of the power end assembly 7 is connected to the reduction box assembly 8. The power end assembly 7 includes a crankcase, a crosshead box and a spacer, the crankcase , The crosshead box and the spacer are connected in sequence.

The stroke of the five-cylinder plunger pump is more than 10". The long-stroke design can better realize the large displacement operation requirements and improve the operation efficiency.

The power of the five-cylinder plunger pump is above 5000 hp. More preferably, the power of the five-cylinder plunger pump is 7000 hp. The cylinder spacing of the five-cylinder plunger pump is 13-14in, which provides a guarantee for the high-power output of the five-cylinder plunger pump. The high-power five-cylinder plunger pump can effectively solve the narrow and required shale gas cracking wellsite area. The problem of more fracturing equipment can reduce the use of equipment and facilitate the layout of the well site.

The crankcase body and the crosshead box body are integrally welded to form a power end shell 11, which is connected to a spacer frame. The power end shell 11 includes a vertical plate 16, a bearing seat 17, and a front end plate 20, The back cover 15, the bottom plate 18, the support plate 19 and the upper cover 21, the number of the vertical plates 16 is 6, the number of the bearing seats 17 is 6, and one vertical plate 16 corresponds to a bearing

seat

17, 6 The vertical plates 16 are arranged in parallel to form a power end cavity, a bottom plate 18 is installed at the bottom of the power end cavity, an upper cover 21 is installed on the top of the power end cavity, and a front end of the power end cavity is installed The front end plate 20 is equipped with a rear cover plate 15 at the rear end of the power end cavity, and a support plate 19 is provided between two adjacent vertical plates 16 arranged in parallel. The crankcase and crosshead box in the power end assembly 7 of the five-cylinder plunger pump adopt an integral welding structure, which makes the structure of the power end assembly 7 stronger, better support stability, and can reduce the vibration of the whole pump. A crankshaft is set in the crankcase, a crosshead, a crosshead cover and a crosshead bearing bush are arranged in the crosshead case, a connecting rod, a connecting rod cover and a connecting rod bearing bush are arranged between the crankcase and the crosshead case, the crankshaft With five crankshaft and six journals, one end of the crankshaft is connected with the reduction box assembly 8, the other end of the crankshaft is connected with the connecting rod through the connecting rod cover and the connecting rod bearing bush, and the other end of the connecting rod is connected through the crosshead cover and the crosshead bearing bush. It is connected with the cross head, the other end of the cross head is connected with a pull rod, and the other end of the pull rod is connected to the hydraulic end valve box through a plunger and a clamp. The crankshaft is installed on the bearing seat 17 of the power end housing 11 through six cylindrical roller bearings, which can realize the rotation of the crankshaft. Slide rails are fixedly installed on the support plate 19, two slide rails form a semicircular space, and the crosshead is installed in the semicircular space to realize linear movement. The gearbox assembly 8 includes a planetary gearbox and a parallel-stage gearbox, and the transmission gears are all helical gears. The planetary reduction gearbox includes a sun gear, four planet gears, a planet carrier and an inner ring gear, which form a planetary gear mechanism. The sun gear is located in the center of the planetary gear mechanism; the parallel-stage reduction gearbox includes a small gear and a large gear, a small gear and an input The large gear is connected with the sun gear of the planetary reduction box, and the speed reduction and torque increase are realized through the reduction box. The drive flange 10 is externally connected to the planetary gearbox, and the drive flange 10 is connected to an external power source to realize power input. The parallel-stage gearbox is connected with the crankshaft to realize power output.

A crankshaft support body 12 is provided at the bottom of the crankcase body, and the crankshaft support body 12 is used to support the crankshaft case body. A crosshead support 13 is provided at the bottom of the crosshead box, and the crosshead support 13 is used to support the crosshead box. A hydraulic support 14 is provided at the bottom of the spacer, and the hydraulic support 14 is used to support the hydraulic end assembly 9. The multi-point support design of the crankcase, crosshead box and hydraulic end assembly 9 can improve the support strength of the five-cylinder plunger pump, reduce vibration, and better ensure high-load operation and more stable operation.

The working principle of the plunger pump 5: the external power or speed drives the gearbox assembly 8 to rotate through the drive flange 10, and the power and torque are transmitted to the crankshaft through the two-stage speed change of the planetary gearbox and the parallel-stage gearbox. The power end housing 11 rotates to drive the connecting rod, crosshead, and pull rod to move, transforming the rotation of the crankshaft into the reciprocating linear motion of the pull rod. The pull rod drives the plunger through the clamp to reciprocate in the valve box, thereby realizing low pressure liquid The suction and the discharge of high-pressure liquid realize the pumping of liquid.

The working principle of the single-unit single-pump electric drive fracturing semi-trailer: the input end of the high-voltage switch is connected to the high-voltage power supply through a cable, the output end of the high-voltage switch is connected to the transformer, and the high-voltage switch is used to control the entire single-unit single-pump electric drive fracturing The power supply of the semi-trailer is switched on and off, the high-voltage power is reduced by the transformer to power the frequency converter, the frequency converter drives the motor 4 to work, the motor 4 drives the plunger pump 5 to work, and the radiator 6 provides cooling for the lubricating oil of the plunger pump 5

Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have Various changes and improvements fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

A single-unit single-pump electric drive fracturing semi-trailer, which is characterized in that it comprises a semi-trailer body, a plunger pump, a radiator, a power supply unit and a motor, and the power supply unit, the motor, the radiator and the plunger pump are integrated in the semi-trailer On the body, there is one electric motor, one radiator, one plunger pump, the power supply unit provides electricity to the electric motor, the electric motor is connected to the plunger pump, and the radiator provides cooling for the lubricating oil of the plunger pump.
The single-machine and single-pump electric drive fracturing semi-trailer according to claim 1, wherein the power supply unit includes a transformer unit and a variable frequency unit, the variable frequency unit is connected to the transformer unit, and the transformer unit is arranged at The semi-trailer body is close to one end of the motor, and the frequency conversion unit is arranged on the gooseneck of the semi-trailer body.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 2, wherein the transformer unit is a cabin structure, and a high-voltage switch and a transformer are arranged in the cabin, and the high-voltage switch is connected to the transformer.
The single-machine single-pump electric drive fracturing semi-trailer according to claim 2, characterized in that: the frequency conversion unit is a cabin structure, a frequency converter is arranged in the frequency conversion unit cabin, and the input end of the frequency converter is connected to the voltage transformation unit Connected, the output end of the frequency converter is connected with the motor.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 1, wherein the plunger pump is a five-cylinder plunger pump, and the five-cylinder plunger pump includes a power end assembly and a hydraulic end assembly. Chenghe reduction gearbox assembly, one end of the power end assembly is connected to the hydraulic end assembly, and the other end of the power end assembly is connected to the reduction gearbox assembly. The power end assembly includes a crankcase, a cross The head box body and the spacer frame, the crankcase body, the crosshead box body and the spacer frame are connected in sequence.
The single-machine single-pump electric drive fracturing semi-trailer according to claim 5, wherein the stroke of the five-cylinder plunger pump is 10" or more.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 5, characterized in that the power of the five-cylinder plunger pump is above 5000hp.
The single-machine single-pump electric drive fracturing semi-trailer according to claim 7, wherein the power of the five-cylinder plunger pump is 7000 hp.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 5, characterized in that: the cylinder spacing of the plunger pump is 13-14 inches.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 5, characterized in that: the crankcase body and the crosshead box body are integrally welded to form a power end shell, and the power end shell is connected to the spacer frame. The power end housing includes a vertical plate, a bearing seat, a front end plate, a rear cover plate, a bottom plate, a supporting plate, and an upper cover plate. The number of the vertical plates is 6, the number of the bearing seats is 6, and one vertical plate corresponds to Connecting to a bearing seat, six vertical plates are arranged in parallel to form a power end cavity. A bottom plate is installed at the bottom of the power end cavity, and an upper cover plate is installed on the top of the power end cavity. A front end plate is installed at the front end of the body, a rear cover plate is installed at the rear end of the power end cavity, and a support plate is arranged between two adjacent vertical plates arranged in parallel.
The single-unit single-pump electrically driven fracturing semi-trailer according to claim 5, wherein a crankshaft support body is provided at the bottom of the crankcase body, and the crankshaft support body is used to support the crankshaft case body.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 5, wherein the bottom of the crosshead box body is provided with a crosshead support body, and the crosshead support body is used to support the crosshead box body.
The single-unit single-pump electric drive fracturing semi-trailer according to claim 5, wherein the bottom of the spacer is provided with a hydraulic support body, and the hydraulic support body is used to support the hydraulic end assembly.