CN114215496A - Fracturing system and fracturing method - Google Patents

Fracturing system and fracturing method Download PDF

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Publication number
CN114215496A
CN114215496A CN202111241528.4A CN202111241528A CN114215496A CN 114215496 A CN114215496 A CN 114215496A CN 202111241528 A CN202111241528 A CN 202111241528A CN 114215496 A CN114215496 A CN 114215496A
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CN
China
Prior art keywords
controller
variable frequency
pipeline
liquid
fracturing
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Pending
Application number
CN202111241528.4A
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Chinese (zh)
Inventor
李然
王初亮
刘波
王大龙
王统诚
刘昊
陈荣明
吴梦雨
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Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
Original Assignee
Beijing Meike Tianma Automation Technology Co Ltd
Beijing Tianma Intelligent Control Technology Co Ltd
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Application filed by Beijing Meike Tianma Automation Technology Co Ltd, Beijing Tianma Intelligent Control Technology Co Ltd filed Critical Beijing Meike Tianma Automation Technology Co Ltd
Priority to CN202111241528.4A priority Critical patent/CN114215496A/en
Publication of CN114215496A publication Critical patent/CN114215496A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/2607—Surface equipment specially adapted for fracturing operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves

Abstract

The invention provides a fracturing system and a fracturing method, wherein the fracturing system comprises a fracturing pump, a fracturing pump and a fracturing unit, wherein the fracturing pump is provided with a liquid outlet; each of the first pipeline and the second pipeline is communicated with the liquid outlet, a flow sensor for detecting the flow of liquid in the first pipeline is arranged on the first pipeline, an adjusting valve is arranged on the second pipeline, the first pipeline is used for guiding the liquid to a working surface, and the second pipeline is communicated with a liquid tank; the variable frequency motor is connected with the fracturing pump so as to drive the fracturing pump; the controller is connected with the variable frequency motor so as to control the variable frequency motor, the flow sensor is connected with the controller so as to feed back a flow signal to the controller, and the controller is connected with the regulating valve so as to control the opening degree of the regulating valve. The fracturing system can adjust the flow and pressure of liquid in time according to actual working conditions.

Description

Fracturing system and fracturing method
Technical Field
The invention relates to the technical field of hydraulic fracturing, in particular to a fracturing system and a fracturing method.
Background
The hydraulic fracturing technology has wide application in the aspect of green and safe development of coal. The fracturing system of the related art can not continuously adjust the rotating speed of the variable frequency motor, can only rely on the mechanical hydraulic transmission to realize that the fracturing pump motor changes speed according to the set gear, has low efficiency and poor precision, and is difficult to timely flow and pressure of liquid according to actual working conditions.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a fracturing system, which can continuously adjust the rotating speed of a variable frequency motor and can timely adjust the flow and pressure of liquid according to actual working conditions.
The embodiment of the invention provides a fracturing method, which can realize the hydraulic fracturing of a coal seam safely and efficiently according to the flow and the pressure of liquid in time under the actual working condition.
The fracturing system of the embodiment of the invention comprises:
a fracturing pump having a liquid outlet;
each of the first pipeline and the second pipeline is communicated with the liquid outlet, a flow sensor for detecting the flow of liquid in the first pipeline is arranged on the first pipeline, an adjusting valve is arranged on the second pipeline, the first pipeline is used for guiding the liquid to a working surface, and the second pipeline is communicated with a liquid tank;
the variable frequency motor is connected with the fracturing pump so as to drive the fracturing pump;
the controller is connected with the variable frequency motor so as to control the variable frequency motor, the flow sensor is connected with the controller so as to feed back a flow signal to the controller, and the controller is connected with the regulating valve so as to control the opening degree of the regulating valve.
The fracturing system provided by the embodiment of the invention has the advantages that the variable frequency motor can continuously adjust the rotating speed of the variable frequency motor, and the flow and the pressure of liquid can be timely adjusted according to the actual working condition.
In some embodiments, the liquid outlets include a first liquid outlet and a second liquid outlet, the first line being in communication with the first liquid outlet, and the second line being in communication with the second liquid outlet.
In some embodiments, the fracturing system further comprises a pressure sensor disposed on the first pipeline, the pressure sensor being configured to detect a pressure of the fluid in the first pipeline, the pressure sensor being connected to the controller for feeding a pressure signal back to the controller.
In some embodiments, the fracturing system further comprises a frequency converter, wherein the controller is connected with the frequency converter, and the frequency converter is connected with the variable frequency motor, so that the controller is connected with the variable frequency motor.
In some embodiments, the fracturing system further comprises an electromagnetic actuator, wherein the controller is connected with the electromagnetic actuator so as to control the electromagnetic actuator, and the electromagnetic actuator is connected with the regulating valve so as to control the opening degree of the regulating valve, so that the controller is connected with the regulating valve.
In some embodiments, the variable frequency motor is a constant power motor.
In some embodiments, the inverter motor has a reference frequency point, if the output frequency of the inverter is greater than or equal to the reference frequency point, the inverter motor is a constant power motor, and if the output frequency of the inverter is less than the reference frequency point, the inverter motor is a constant torque motor.
In some embodiments, the reference frequency point of the inverter motor is 50Hz, and the highest frequency of the inverter motor is 100 Hz.
The fracturing method provided by the embodiment of the invention comprises the following steps of:
starting the variable frequency motor through the controller and controlling the variable frequency motor to rotate at a constant speed, so that the liquid flow in the first pipeline reaches a first preset value, and the liquid pressure reaches a second preset value;
controlling the rotation speed of the variable frequency motor to increase through the controller, so that the liquid flow in the first pipeline reaches a third preset value, and the liquid pressure reaches a fourth preset value, wherein the third preset value is larger than the first preset value, and the fourth preset value is larger than the second preset value;
the rotating speed of the variable frequency motor is adjusted through the controller, and the opening of the adjusting valve is adjusted, so that the liquid pressure in the first pipeline is maintained at the fourth preset value for a time t;
the rotating speed of the variable frequency motor is adjusted through the controller, and the opening degree of the adjusting valve is adjusted, so that the pressure of the liquid in the first pipeline is slowly reduced to 0.
In some embodiments, the adjusting, by the controller, the rotation speed of the inverter motor and the opening of the regulating valve to maintain the pressure of the liquid in the first pipeline at the fourth preset value for the duration t includes:
determining continuous time points;
measuring and recording the actual pressure value of the liquid in the first pipeline according to the continuous time points;
and comparing the actual pressure values of two adjacent time points, if the actual pressure value of the latter time point is far smaller than the actual pressure value of the former time point, judging that the actual pressure value suddenly drops, and closing the variable frequency motor.
Drawings
Fig. 1 is a schematic structural diagram of a fracturing system in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a fracturing system in an embodiment of the present invention.
Reference numerals:
a fracturing pump 1;
a variable frequency motor 2;
a controller 3;
a frequency converter 4;
an adjusting valve 5;
an electromagnetic starter 6;
a first pipeline 7;
a second conduit 8;
a frame 9;
a traveling wheel 10;
a support bar 11.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A fracturing system of an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1 and 2, the fracturing system of the embodiment of the invention comprises a fracturing pump 1, a first pipeline 7, a second pipeline 8, a variable frequency motor 2 and a controller 3.
The fracturing pump 1 is provided with a liquid outlet, each of a first pipeline 7 and a second pipeline 8 is communicated with the liquid outlet, a flow sensor used for detecting the flow of liquid in the first pipeline 7 is arranged on the first pipeline 7, an adjusting valve 5 is arranged on the second pipeline 8, the first pipeline 7 is used for guiding the liquid to a working surface, and the second pipeline 8 is communicated with a liquid tank.
Variable frequency motor 2 links to each other with fracturing pump 1 to drive fracturing pump 1, and controller 3 links to each other so that control variable frequency motor 2 with variable frequency motor 2, and flow sensor links to each other so that to the feedback flow signal of controller 3 with controller 3, and controller 3 links to each other so that control governing valve 5's aperture with governing valve 5.
Specifically, the regulating valve 5 is an electric regulating valve 5.
It will be appreciated that the fluid in the fracturing system of embodiments of the present invention may be water or other fracturing medium.
The fracturing system provided by the embodiment of the invention can utilize the controller 3 to control the continuous change of the rotating speed of the variable frequency motor 2, the flow sensor can feed back a flow signal to the controller 3, and when other conditions are set, the pressure is increased when the flow is increased. Therefore, the fracturing system provided by the embodiment of the invention has the advantages that the variable frequency motor 2 can continuously adjust the rotating speed of the variable frequency motor 2, and the flow and the pressure of liquid can be timely adjusted according to the actual working condition.
In addition, controller 3 can control governing valve 5's aperture, open the back at governing valve 5, the liquid hole is annotated in the partial liquid entering coal seam of fracturing pump 1's liquid outlet, and other partial liquid of fracturing pump 1's liquid outlet pass through second pipeline 8 and enter into the liquid case, and the fracturing fluid is to the downthehole impact of liquid is annotated in the coal seam when effectively having cushioned fracturing pump 1 and starting, guarantees to annotate the hole sealing operation in liquid hole, and after fracturing pump 1 started, then can progressively close governing valve 5.
As shown in fig. 1 and 2, the fracturing system of the embodiment of the invention further includes an electromagnetic starter 6, the controller 3 is connected to the electromagnetic starter 6 to control the electromagnetic starter 6, and the electromagnetic starter 6 is connected to the regulating valve 5 to control the opening degree of the regulating valve 5, so that the controller 3 is connected to the regulating valve 5. That is to say, controller 3 control electromagnetic starter 6, and electromagnetic starter 6 controls the aperture of governing valve 5 again, therefore controller 3 can be according to the signal of receiving again the aperture of governing valve 5 to can be according to the timely flow and the pressure of liquid of operating condition, and then can realize safely, realize coal seam hydraulic fracturing high-efficiently.
As shown in fig. 1 and 2, the fracturing system of the embodiment of the invention further comprises a frame 9, the fracturing pump, the variable frequency motor, the controller and the electromagnetic starter are placed on the frame 9, and the frame 9 is provided with traveling wheels 10, so that the fracturing system of the embodiment of the invention can move in a coal mine tunnel. The frame 9 is also provided with a lifting support rod 11, and when fracturing construction is carried out, the support rod 11 can support the frame 9, so that the stability of the frame 9 is ensured. Alternatively, the support bar 11 is a hydraulic bar.
In some embodiments, as shown in fig. 1 and 2, the liquid outlets include a first liquid outlet and a second liquid outlet, the first line 7 being in communication with the first liquid outlet, and the second line 8 being in communication with the second liquid outlet.
That is to say, part of the liquid at the outlet of the fracturing pump 1 flows out through the first outlet, and the other part of the liquid at the outlet of the fracturing pump 1 flows out through the second outlet. At a constant total flow, the flow rates in the first and second lines 7 and 8 cancel each other out, so that the liquid flow rate in the first line 7 can be adjusted by the opening degree of the adjusting valve 5.
In some embodiments, the fracturing system of the embodiment of the present invention further includes a pressure sensor disposed on the first pipeline 7, the pressure sensor is used for detecting the pressure of the liquid in the first pipeline 7, and the pressure sensor is connected to the controller 3, so that the pressure sensor can feed back a pressure signal to the controller 3.
It can be understood that, after receiving the liquid pressure signal in the first pipeline 7 fed back by the pressure sensor, the controller 3 can adjust the rotation speed of the variable frequency motor 2 and the opening degree of the regulating valve 5 according to the pressure required by the actual working condition, so as to obtain the required liquid pressure.
In some embodiments, as shown in fig. 1 and 2, the fracturing system of the embodiment of the present invention further includes a frequency converter 4, the controller 3 is connected to the frequency converter 4, and the frequency converter 4 is connected to the variable frequency motor 2, so that the controller 3 is connected to the variable frequency motor 2.
It can be understood that the controller 3 can control the output frequency of the frequency converter 4, the output frequency of the frequency converter 4 is transmitted to the variable frequency motor 2, the rotating speed of the variable frequency motor 2 changes along with the change of the output frequency of the frequency converter 4, and thus the controller 3 can control the rotating speed of the variable frequency motor 2 according to the received signal.
In some embodiments, the variable frequency motor 2 is a constant power motor. That is, the higher the frequency, the higher the rotation speed of the inverter motor 2, and when the inverter motor 2 is constant in power, the torque is in inverse proportion to the rotation speed. The higher the rotating speed of the variable frequency motor 2 is, the lower the torque is; conversely, the smaller the rotation speed of the variable frequency motor 2 is, the higher the torque is, and when the frequency reaches the maximum frequency, the torque reaches the minimum. Along with the reduction of the frequency, the rotating speed of the motor is reduced, the torque is increased along with the reduction of the rotating speed, and the maximum torque can be achieved at the lowest frequency. Therefore, the inverter motor 2 can achieve the maximum torque at a lower power.
In other embodiments, the inverter motor 2 has a reference frequency point, the output frequency of the inverter 4 is greater than or equal to the reference frequency point, the inverter motor 2 is a constant power motor, and the output frequency of the inverter 4 is less than the reference frequency point, the inverter motor 2 is a constant torque motor.
That is to say, when the frequency of the variable frequency motor 2 is the reference frequency point or between the reference frequency point and the maximum power point, the power of the variable frequency motor 2 is constant, the rotation speed and the torque are in an inverse relation, the larger the rotation speed of the variable frequency motor 2 is, the smaller the torque is, and conversely, the smaller the rotation speed is, the larger the torque is, and the variable frequency motor 2 has the characteristics of small discharge capacity and high pressure at the moment, so that the variable frequency motor is suitable for liquid injection after the hole sealing of the coal seam liquid injection hole and before the fracturing is completed, and the high-efficiency fracturing of the coal seam is ensured.
When the frequency of variable frequency motor 2 is below the reference frequency point, the moment of torsion of variable frequency motor 2 is invariable, and variable frequency motor 2 has the characteristics of large discharge capacity and low pressure at this moment, is applicable to the liquid injection when the hole is annotated to the coal seam and after the fracturing is accomplished, guarantees the hole sealing of annotating the liquid hole and the safe pressure release in coal seam to the coal seam.
Optionally, the reference frequency point of the inverter motor 2 is 50Hz, and the highest frequency of the inverter motor 2 is 100 Hz.
That is, when the frequency of the inverter motor 2 is 50Hz or between 50Hz and 100Hz, the inverter motor 2 is a constant power motor; when the frequency of the variable frequency motor 2 is below 50Hz, the variable frequency motor 2 is a constant torque motor.
The fracturing method of the embodiment of the present invention is described below.
The fracturing method provided by the embodiment of the invention comprises the following steps of:
and S1, starting the variable frequency motor 2 through the controller 3 and controlling the variable frequency motor 2 to rotate at a constant speed, so that the liquid flow in the first pipeline 7 reaches a first preset value, and the liquid pressure reaches a second preset value. That is, before the fracturing starts, the liquid in the first pipeline 7 expands the hole packer under the conditions of low flow and pressure, a closed cavity is formed inside the hole to prepare for fracturing, and the process is a setting stage of the coal bed hydraulic fracturing.
And S2, controlling the rotation speed of the variable frequency motor 2 to increase through the controller 3, so that the liquid flow in the first pipeline 7 reaches a third preset value, and the liquid pressure reaches a fourth preset value, wherein the third preset value is greater than the first preset value, and the fourth preset value is greater than the second preset value. That is, at the initial stage of fracturing, the fluid flow and pressure in the first conduit 7 continues to increase, which is the initiation stage of hydraulic fracturing of the coal seam.
And S3, adjusting the rotating speed of the variable frequency motor 2 and the opening degree of the adjusting valve 5 through the controller 3, and maintaining the liquid pressure in the first pipeline 7 at a fourth preset value for a time t. That is to say, in the fracturing process, the liquid pressure in the first pipeline 7 is kept unchanged, so that the efficient and stable fracturing effect is realized, and the process is the fracturing stage of the coal seam hydraulic fracturing. Specifically, the regulating valve 5 is opened, the rotating speed of the variable frequency motor 2 is increased, the opening degree of the regulating valve 5 and the rotating speed of the variable frequency motor 2 are continuously adjusted until the liquid pressure in the first pipeline 7 is stabilized at the fourth preset value.
And S4, the controller 3 adjusts the rotating speed of the variable frequency motor 2 and the opening degree of the adjusting valve 5, so that the pressure of the liquid in the first pipeline 7 is slowly reduced to 0. Specifically, the rotating speed of the variable frequency motor 2 is gradually reduced, and the regulating valve 5 is gradually opened, so that the liquid in the first pipeline 7 flows into the liquid tank, and pressure relief is realized.
In some embodiments, the adjusting the rotation speed of the variable frequency motor 2 and the opening degree of the regulating valve 5 by the controller 3, so that the pressure of the liquid in the first pipeline 7 is maintained at the fourth preset value for the duration t comprises:
determining continuous time points;
measuring and recording the actual pressure value of the liquid in the first pipeline 7 according to the continuous time points;
and comparing the actual pressure values of two adjacent time points, if the actual pressure value of the latter time point is far smaller than the actual pressure value of the former time point, judging that the actual pressure value suddenly drops, and closing the variable frequency motor 2.
That is, in step S3, it is determined whether the actual pressure value suddenly drops, so as to ensure that the pressure of the liquid in the first pipeline 7 is stabilized at the fourth preset value within the time t.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A fracturing system, comprising:
a fracturing pump having a liquid outlet;
each of the first pipeline and the second pipeline is communicated with the liquid outlet, a flow sensor for detecting the flow of liquid in the first pipeline is arranged on the first pipeline, an adjusting valve is arranged on the second pipeline, the first pipeline is used for guiding the liquid to a working surface, and the second pipeline is communicated with a liquid tank;
the variable frequency motor is connected with the fracturing pump so as to drive the fracturing pump;
the controller is connected with the variable frequency motor so as to control the variable frequency motor, the flow sensor is connected with the controller so as to feed back a flow signal to the controller, and the controller is connected with the regulating valve so as to control the opening degree of the regulating valve.
2. The fracturing system of claim 1, wherein said fluid outlet comprises a first fluid outlet and a second fluid outlet, said first line being in communication with said first fluid outlet and said second line being in communication with said second fluid outlet.
3. The fracturing system of claim 1, further comprising a pressure sensor disposed on said first conduit, said pressure sensor for sensing the pressure of the fluid in said first conduit, said pressure sensor being connected to said controller for feeding a pressure signal back to said controller.
4. The fracturing system of claim 1, further comprising a frequency converter, wherein the controller is coupled to the frequency converter, and wherein the frequency converter is coupled to the variable frequency motor, thereby enabling the controller to be coupled to the variable frequency motor.
5. The fracturing system of claim 1, further comprising an electromagnetic actuator, wherein said controller is coupled to said electromagnetic actuator to control said electromagnetic actuator, and wherein said electromagnetic actuator is coupled to said regulating valve to control an opening of said regulating valve to thereby enable said controller to be coupled to said regulating valve.
6. The fracturing system of claim 1, wherein the variable frequency motor is a constant power motor.
7. The fracturing system of claim 1, wherein the variable frequency motor has a reference frequency point, wherein if the output frequency of the frequency converter is greater than or equal to the reference frequency point, the variable frequency motor is a constant power motor, and if the output frequency of the frequency converter is less than the reference frequency point, the variable frequency motor is a constant torque motor.
8. The fracturing system of claim 7, wherein the reference frequency point of the variable frequency motor is 50Hz and the maximum frequency of the variable frequency motor is 100 Hz.
9. A method of fracturing, comprising the steps of:
starting the variable frequency motor through the controller and controlling the variable frequency motor to rotate at a constant speed, so that the liquid flow in the first pipeline reaches a first preset value, and the liquid pressure reaches a second preset value;
controlling the rotation speed of the variable frequency motor to increase through the controller, so that the liquid flow in the first pipeline reaches a third preset value, and the liquid pressure reaches a fourth preset value, wherein the third preset value is larger than the first preset value, and the fourth preset value is larger than the second preset value;
the rotating speed of the variable frequency motor is adjusted through the controller, and the opening of the adjusting valve is adjusted, so that the liquid pressure in the first pipeline is maintained at the fourth preset value for a time t;
the rotating speed of the variable frequency motor is adjusted through the controller, and the opening degree of the adjusting valve is adjusted, so that the pressure of the liquid in the first pipeline is slowly reduced to 0.
10. The fracturing method of claim 9, wherein the maintaining the pressure of the liquid in the first pipeline at the fourth preset value for the duration t by the controller adjusting the rotation speed of the variable frequency motor and adjusting the opening of the regulating valve comprises:
determining continuous time points;
measuring and recording the actual pressure value of the liquid in the first pipeline according to the continuous time points;
and comparing the actual pressure values of two adjacent time points, if the actual pressure value of the latter time point is far smaller than the actual pressure value of the former time point, judging that the actual pressure value suddenly drops, and closing the variable frequency motor.
CN202111241528.4A 2021-10-25 2021-10-25 Fracturing system and fracturing method Pending CN114215496A (en)

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CN204436361U (en) * 2015-02-15 2015-07-01 重庆大学 A kind of underground coal mine Hydraulic fracturing pressure flow quantity intelligent adjusting device
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