CN113374530A - Method and device for regulating and controlling pretreatment of hydraulic fracturing ore rock - Google Patents
Method and device for regulating and controlling pretreatment of hydraulic fracturing ore rock Download PDFInfo
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- CN113374530A CN113374530A CN202110926092.6A CN202110926092A CN113374530A CN 113374530 A CN113374530 A CN 113374530A CN 202110926092 A CN202110926092 A CN 202110926092A CN 113374530 A CN113374530 A CN 113374530A
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- E—FIXED CONSTRUCTIONS
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention provides a method and a device for regulating and controlling the pretreatment of hydraulic fracturing ore, which comprises the steps of enabling a water injection pump to work under preset working parameters and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time; if the micro-seismic signal is not added with a new micro-seismic signal within the first preset time, regulating and controlling the working parameters of the water injection pump to increase the water injection flow of the water injection pump so as to obtain new working parameters of the water injection pump; enabling the water injection pump to work under the new working parameters, and monitoring a newly added microseismic signal of the microseismic signal generated by the microseismic detection equipment in real time to obtain the occurrence condition of the newly added microseismic signal; and regulating and controlling the water injection pump according to the occurrence condition of the newly added micro-seismic signal according to a preset water injection pump regulation and control rule. The method and the device can solve the problems that fine management is difficult to manage, the pre-treatment effect of the hydraulic fracturing rock is not timely displayed, the operation efficiency is low and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a method and a device for regulating and controlling pretreatment of hydraulic fracturing ore rocks.
Background
The natural caving method mining technology is an underground mining method with high efficiency and low cost, and is mainly suitable for low-grade thick ore bodies with broken ore rocks and steep inclination angles. With the development of the ore rock pretreatment technology, the problems of poor ore rock caving property, high block rate, caving suspension and the like in the natural caving method mining process are well solved, the application range of the natural caving method mining technology is expanded, and the natural caving method is gradually popularized and applied to medium-hard and hard rock mines with good integrity.
The hydraulic fracturing ore rock pretreatment is an ore rock pretreatment technology which is applied to natural caving method mines at present. The technology mainly comprises the steps of drilling a hole in the ore rock construction of a to-be-caving area, sealing the hole by using a packer to form a fracturing section, injecting high-pressure fluid (usually water), cracking the hole wall rock of the sealing section to form a hydraulic fracture and expanding the hydraulic fracture to the interior of the ore rock, lifting or lowering the packer according to a certain interval after one-section fracturing, and fracturing section by section until the fracturing of the whole hole section is finished. The equipment used in the process of pretreating the hydraulic fracturing ore rock mainly comprises a high-pressure water injection pump, a high-pressure water pipe and a packer.
In the process of the hydraulic fracturing ore rock pretreatment operation, water injection pressure, injection flow, water injection time, hydraulic fracture expansion range and the like are generally monitored. Currently, the above parameters are mainly monitored by using independent instruments, such as: the water injection pressure is monitored by a pointer type pressure gauge, the injection flow is monitored by a flowmeter, and the hydraulic fracture expansion range is generally monitored by a microseismic system and subjected to later positioning analysis.
The parameters of the existing hydraulic fracturing ore rock pretreatment operation process are monitored relatively independently, each monitoring system works independently, the task is single, the monitoring systems are usually mechanical instruments, and a comprehensive integrated information acquisition system is not formed to monitor and store the parameters of the fracturing process in real time, so that the data of the hydraulic fracturing ore rock pretreatment operation process is lost, and the fine management and the work optimization are not facilitated; and the working parameters of the high-pressure water injection pump are not regulated and controlled in real time based on hydraulic fracture expansion range feedback, so that the hydraulic fracturing ore rock pretreatment effect is not displayed timely, and the operation efficiency is low.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method and a device for regulating and controlling the pretreatment of hydraulic fracturing rock, so as to solve the problems that the parameters of the current pretreatment operation of hydraulic fracturing rock are relatively independent, so that the data of the pretreatment operation of hydraulic fracturing rock is lost, and the fine management and the work optimization are not facilitated; the pretreatment effect of the hydraulic fracturing ore rock is not displayed timely, the operation efficiency is low and the like.
The invention provides a method for regulating and controlling pretreatment of hydraulic fracturing ore rocks, which comprises the following steps:
enabling the water injection pump to work under preset working parameters, and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
if the microseismic signal does not have a new microseismic signal within a first preset time, regulating and controlling the working parameters of the water injection pump to increase the water injection flow of the water injection pump so as to obtain new working parameters of the water injection pump;
enabling the water injection pump to work under the new working parameters, and monitoring a newly added microseismic signal of the microseismic signal generated by the microseismic detection equipment in real time to obtain the occurrence condition of the newly added microseismic signal;
and regulating and controlling the water injection pump according to the occurrence condition of the newly added microseismic signal according to a preset water injection pump regulation and control rule.
In addition, the preferable scheme is that the enabling of the water injection pump to work under preset working parameters and the real-time monitoring of the microseismic signals generated by the microseismic detection equipment arranged on the hydraulic fracturing target comprises:
arranging the microseismic detection equipment on the hydraulic fracturing target at intervals, and arranging a high-pressure water pipe of the water injection pump at a position to be fractured of the hydraulic fracturing target;
starting the water injection pump to enable the water injection pump to work under preset working parameters, and monitoring a micro-seismic signal generated by the micro-seismic detection equipment in real time; the preset working parameters comprise the rotating speed of an engine and a high-pressure water outlet valve.
In addition, the preferable scheme is that after the water injection pump is enabled to work under preset working parameters and the microseismic signals generated by the microseismic detection equipment arranged on the hydraulic fracturing target are monitored in real time, the method further comprises the following steps:
and carrying out positioning analysis on the monitored position of the microseismic signal in real time, and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target.
In addition, it is preferable that the performing a location analysis on the monitored location of the microseismic signal in real time and determining the extension range of the hydraulic fracture on the hydraulic fracturing target includes:
carrying out filtering signal processing on the microseismic signal to obtain a filtered microseismic signal;
carrying out inversion processing on the micro-fracture of the hydrofracturing target according to the capture time of the filtered microseismic signal, the pre-acquired acoustic wave speed of the hydrofracturing target and the pre-acquired three-dimensional coordinates of the detection point to obtain the seismic source position of the filtered microseismic signal;
drawing a three-dimensional graph of the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the seismic source position of the filtered microseismic signal;
and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the three-dimensional graph of the expansion range of the hydraulic fracture.
In addition, the preferable scheme is that the microseismic detection equipment is a microseismic monitoring sensor; the microseismic monitoring sensors are spatially arranged in a three-dimensional manner.
In addition, preferably, if the microseismic signal does not have a new microseismic signal within a first preset time, the operating parameters of the water injection pump are regulated and controlled to increase the water injection flow of the water injection pump, and obtaining the new operating parameters of the water injection pump includes:
if the microseismic signals do not have newly increased microseismic signals within a first preset time, acquiring water injection fracturing parameters of the water injection pump corresponding to the preset working parameters;
regulating and controlling the working parameters of the water injection pump by regulating and controlling the engine speed and a high-pressure water outlet valve of the water injection pump according to the preset working parameters and the water injection fracturing parameters, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained; wherein the water flooding fracturing parameters include: water injection pressure and water injection flow.
In addition, preferably, if the microseismic signal does not have a new microseismic signal within a first preset time, the acquiring the water injection fracturing parameter of the water injection pump corresponding to the preset working parameter includes:
and acquiring the water injection pressure and the water injection flow of the water injection pump corresponding to the preset working parameters through a pressure sensor and a flow sensor which are arranged on the water injection pump respectively.
In addition, the preferable scheme is that the preset water injection pump regulation and control rule comprises:
if the occurrence condition of the newly added microseismic signal is as follows: controlling the water injection pump to stop working if no new microseismic signal appears within a second preset time, and completing the fracturing work of the hydraulic fracturing target in the current fracturing section;
if the occurrence condition of the newly added microseismic signal is as follows: and in a second preset time, if a new micro-seismic signal appears, the water injection pump continues to work under the new working parameter, and the micro-seismic signal generated by the micro-seismic detection equipment is monitored in real time.
The invention provides a hydraulic fracturing ore rock pretreatment regulation and control device, which comprises:
the real-time monitoring module is used for enabling the water injection pump to work under preset working parameters and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
the working parameter regulating and controlling module is used for regulating and controlling the working parameters of the water injection pump if the microseismic signal does not have a new microseismic signal within a first preset time, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained;
the newly added microseismic signal monitoring module is used for enabling the water injection pump to work under the new working parameters and monitoring newly added microseismic signals of the microseismic signals generated by the microseismic detection equipment in real time to obtain the appearance condition of the newly added microseismic signals;
and the water injection pump regulation and control module is used for regulating and controlling the water injection pump according to the occurrence condition of the newly added microseismic signal according to a preset water injection pump regulation and control rule.
According to the technical scheme, the method and the device for regulating and controlling the pretreatment of the hydraulic fracturing ore rock, provided by the invention, can be used for monitoring the microseismic signals generated by the microseismic detection equipment in real time and regulating the working parameters of the water injection pump according to the occurrence condition of the newly added microseismic signals of the microseismic signals, so that field operators can know the parameters of the whole fracturing process, the centralized management is convenient, and the operation efficiency is improved; the fracturing effect of the pre-treatment process of the hydraulic fracturing ore rock is mastered in real time, and the working parameters and the working state of the water injection pump are adjusted in real time, so that the pre-treatment operation process of the hydraulic fracturing ore rock can be controlled more reasonably and efficiently, and the fracturing efficiency is improved; in conclusion, the real-time monitoring of the parameters of the hydraulic fracturing ore rock pretreatment process and the real-time regulation and control of the operation parameters are facilitated, so that the fine management of the operation process, the real-time display of the fracturing effect, the improvement of the operation efficiency and the like are realized.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a flow chart of a method of conditioning a hydraulic fracturing rock pretreatment in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a corresponding apparatus in practical application of the method for conditioning and controlling pre-treatment of hydraulic fracturing rock according to the embodiment of the invention;
FIG. 3 is a block diagram of a three-dimensional data formation module for hydraulic fracture propagation range according to an embodiment of the invention;
fig. 4 is a schematic regulating and controlling flow diagram of the hydraulic fracturing ore rock pretreatment regulating and controlling device according to the embodiment of the invention.
In the attached drawing, 11-a mobile workstation, 12-a display terminal, 2-an industrial control box, 21-a multi-channel dynamic data acquisition instrument, 22-an industrial controller, 23-an analog quantity module, 3-a high-pressure water injection pump, 41-a data signal cable, 42-a microseismic monitoring sensor, 43-a microseismic detection signal module, 44-a filtering signal processing module, 45-a microseismic arrival time capturing module, 46-a seismic source positioning module, 47-a rock mass sound wave speed module, 48-a monitoring point three-dimensional coordinate module, 51-a high-pressure water pipe, 52-a pressure transmitter and 53-a flow sensor.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that parameters of the conventional hydrofracturing ore rock pretreatment operation process are monitored relatively independently, data of the hydrofracturing ore rock pretreatment operation process are lost, and fine management and work optimization are not facilitated; the problems of untimely manifestation of the pretreatment effect of the hydraulic fracturing rock, low operation efficiency and the like are solved, and a method and a device for regulating and controlling the pretreatment of the hydraulic fracturing rock are provided.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the method for regulating and controlling the pretreatment of the hydraulic fracturing rock, fig. 1 shows the flow of the method for regulating and controlling the pretreatment of the hydraulic fracturing rock according to the embodiment of the invention.
As shown in fig. 1, the method for regulating and controlling the pretreatment of the hydraulic fracturing ore rock is characterized by comprising the following steps:
step S110, enabling a water injection pump to work under preset working parameters, and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
step S120, if the microseismic signals do not have newly increased microseismic signals within a first preset time, regulating and controlling the working parameters of the water injection pump to increase the water injection flow of the water injection pump so as to obtain new working parameters of the water injection pump;
step S130, enabling the water injection pump to work under the new working parameters, and monitoring a newly added microseismic signal of the microseismic signal generated by the microseismic detection equipment in real time to obtain the occurrence condition of the newly added microseismic signal;
and S140, regulating and controlling the water injection pump according to the occurrence condition of the newly added micro-seismic signal according to a preset water injection pump regulation and control rule.
The micro-seismic signals generated by the micro-seismic detection equipment are monitored in real time, and the working parameters of the water injection pump are adjusted according to the occurrence condition of the newly added micro-seismic signals of the micro-seismic signals, so that field operation personnel can know the parameters of the whole fracturing process, the centralized management is facilitated, and the operation efficiency is improved; the fracturing effect of the pre-treatment process of the hydraulic fracturing ore rock is mastered in real time, and the working parameters and the working state of the water injection pump are adjusted in real time, so that the pre-treatment operation process of the hydraulic fracturing ore rock can be controlled more reasonably and efficiently, and the fracturing efficiency is improved; in conclusion, the real-time monitoring of the parameters of the hydraulic fracturing ore rock pretreatment process and the real-time regulation and control of the operation parameters are facilitated, so that the fine management of the operation process, the real-time display of the fracturing effect, the improvement of the operation efficiency and the like are realized.
As a preferred scheme of the present invention, the operation of the water injection pump under preset operation parameters and the real-time monitoring of the microseismic signals generated by the microseismic detection equipment arranged on the hydraulic fracturing target comprises:
arranging microseismic detection equipment on a hydraulic fracturing target at intervals, and arranging a high-pressure water pipe of a water injection pump at a position to be fractured of the hydraulic fracturing target;
starting a water injection pump to enable the water injection pump to work under preset working parameters, and monitoring a micro-seismic signal generated by micro-seismic detection equipment in real time; the preset working parameters comprise the rotating speed of the engine and a high-pressure water outlet valve.
As a preferred embodiment of the present invention, after the water injection pump is operated under preset operating parameters and the microseismic signal generated by the microseismic detection device disposed on the hydraulic fracturing target is monitored in real time, the method further comprises: and carrying out positioning analysis on the position of the monitored microseismic signal in real time, and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target.
As a preferred aspect of the present invention, the positioning and analyzing the monitored position of the microseismic signal in real time, and the determining the extension range of the hydraulic fracture on the hydraulic fracturing target includes:
filtering the microseismic signals to obtain filtered microseismic signals;
carrying out inversion processing on the microfracture of the hydrofracturing target according to the capture time of the filtered microseismic signal, the pre-acquired acoustic velocity of the hydrofracturing target and the pre-acquired three-dimensional coordinates of the detection point to obtain the seismic source position of the filtered microseismic signal;
drawing a three-dimensional graph of the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the seismic source position of the filtered microseismic signal;
and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the three-dimensional graph of the expansion range of the hydraulic fracture.
As a preferred scheme of the invention, the microseismic detection equipment is a microseismic monitoring sensor; the microseismic monitoring sensors are spatially arranged in a three-dimensional manner.
As a preferred embodiment of the present invention, if the microseismic signal does not have a new microseismic signal within a first preset time, the operating parameters of the water injection pump are adjusted and controlled to increase the water injection flow of the water injection pump, and obtaining the new operating parameters of the water injection pump includes:
if the microseismic signals do not have new microseismic signals within a first preset time, acquiring water injection fracturing parameters of the water injection pump corresponding to preset working parameters;
regulating and controlling the working parameters of the water injection pump by regulating and controlling the engine rotating speed and the high-pressure water outlet valve of the water injection pump according to preset working parameters and water injection fracturing parameters, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained; wherein, the water injection fracturing parameters include: water injection pressure and water injection flow.
As a preferred embodiment of the present invention, if the microseismic signal does not have a new microseismic signal within a first preset time, the acquiring the water injection fracturing parameter of the water injection pump corresponding to the preset working parameter comprises:
and acquiring the water injection pressure and the water injection flow of the water injection pump corresponding to the preset working parameters through a pressure sensor and a flow sensor which are arranged on the water injection pump respectively.
As a preferable aspect of the present invention, the preset water injection pump regulation and control rule includes:
if the appearance condition of the newly added microseismic signal is as follows: controlling the water injection pump to stop working if no new micro-seismic signal appears within a second preset time, and completing the fracturing work of the hydraulic fracturing target in the current fracturing section;
if the appearance condition of the newly added microseismic signal is as follows: and in a second preset time, if a new micro-seismic signal appears, the water injection pump is enabled to continue to work under the new working parameter, and the micro-seismic signal generated by the micro-seismic detection equipment is monitored in real time.
The invention provides a hydraulic fracturing ore rock pretreatment regulation and control device, which comprises:
the real-time monitoring module is used for enabling the water injection pump to work under preset working parameters and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
the working parameter regulating and controlling module is used for regulating and controlling the working parameters of the water injection pump if the micro-seismic signals do not have newly increased micro-seismic signals within a first preset time, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained;
the newly added microseismic signal monitoring module is used for enabling the water injection pump to work under the new working parameters and monitoring newly added microseismic signals of the microseismic signals generated by the microseismic detection equipment in real time to obtain the appearance condition of the newly added microseismic signals;
and the water injection pump regulation and control module is used for regulating and controlling the water injection pump according to the occurrence condition of the newly added micro-seismic signal according to the preset water injection pump regulation and control rule.
In order to better illustrate the application of the method and the device for pretreating the hydraulic fracturing rock ore, a device for regulating and controlling the pretreatment of the hydraulic fracturing rock ore, which is adopted in practical application, is provided below.
FIG. 2 illustrates the configuration of a hydrofracturing ore rock pretreatment conditioning device in use, according to an embodiment of the present invention; FIG. 3 illustrates the structure of a hydraulic fracture propagation range three-dimensional data formation module according to an embodiment of the invention; fig. 4 shows a regulation and control flow of the hydraulic fracturing ore rock pretreatment regulation and control device according to the embodiment of the invention.
As shown in fig. 2 to 4, the device used in the actual application process of the method for regulating and controlling the pretreatment of the hydraulic fracturing rock ore provided by the invention comprises a mobile terminal, an industrial control box 2 and a parameter monitoring device, wherein the mobile terminal comprises a mobile workstation 11; the mobile workstation 11 comprises a data acquisition and analysis module and an industrial control module connected with the data acquisition and analysis module; the industrial control box comprises a multi-channel dynamic data acquisition instrument 21 connected with the data acquisition and analysis module and an industrial controller 22 respectively connected with the industrial control module and the data acquisition and analysis module; the industrial controller 22 is connected with the high-pressure water injection pump 3; the parameter monitoring device comprises a high-pressure water injection pump working parameter transmission device connected with an industrial controller 22, a hydraulic fracture expansion range monitoring device and a high-pressure water pipe parameter monitoring device which are respectively connected with a multi-channel dynamic data acquisition instrument 21.
The data acquisition and analysis module is used for operating data acquisition and analysis software; the industrial control module is used for operating industrial control software.
The parameter monitoring device is used for monitoring process parameters such as water injection pressure, injection flow, water injection time and hydraulic fracture expansion range in the hydraulic fracturing ore rock pretreatment operation and working parameters of a high-pressure water injection pump such as engine rotating speed and a high-pressure outlet valve in real time, so that field operators can know fracturing whole-process parameters, centralized management is facilitated, and the operation efficiency is improved; the industrial controller 22 is used for controlling the fracturing effect of the hydraulic fracturing ore rock pretreatment process in real time according to the analysis result of the data acquisition and analysis module, and accordingly, the working parameters and the working state of the high-pressure water injection pump are adjusted in real time, so that the hydraulic fracturing ore rock pretreatment operation process can be controlled more reasonably and efficiently, and the fracturing efficiency is improved.
The mobile terminal also comprises a display terminal 12 connected with the mobile workstation; the display terminal 12 is respectively connected with the industrial controller 22 and the multi-channel dynamic data acquisition instrument 21.
The working parameters of the high-pressure water injection pump collected by the industrial controller 22, the hydraulic fracture expansion range and the high-pressure water pipe parameters collected by the multi-channel dynamic data collector 21 and the data analyzed by the mobile workstation are displayed through the display terminal 12, wherein the working parameters of the high-pressure water injection pump comprise the working state (opening or closing), the engine rotating speed, the high-pressure water outlet valve, the fuel quantity, the water temperature, the oil temperature and the like; the parameters of the high-pressure water pipe comprise water injection pressure, water injection flow and water injection time. The display terminal 12 is preferably an industrial-grade display terminal.
The mobile workstation 11 also comprises a high-pressure water pipe data curve drawing module connected with the data acquisition and analysis module; the data curve drawing module is connected with the display terminal 12.
The water pressure and the injection flow can be displayed in a curve form in real time through a high-pressure water pipe data curve drawing module, the horizontal axis is time, and the vertical axis is a pressure value and a flow value respectively; the accumulated injection flow and the injection time are displayed in real time in a numerical form; the engine speed of the high-pressure water injection pump is displayed in a dial form.
Wherein, the high-pressure water injection pump working parameter transmission device comprises a data signal cable 41 for connecting the high-pressure water injection pump 3 and the industrial controller 22.
The working parameters of the high-pressure water injection pump 3 are transmitted to the industrial controller 22 in a data form through the data signal cable 41 and then transmitted to the mobile workstation 11, the industrial controller 22 is controlled through the industrial control module after being analyzed through the data acquisition and analysis module, and the working parameters of the high-pressure water injection pump 3 are set through the industrial controller 22.
The hydraulic fracture expansion range monitoring device comprises a microseismic monitoring sensor 42 arranged in a drilling hole of a roadway floor or wall surrounding rock; the microseismic monitoring sensors 42 are spatially arranged in a three-dimensional manner, and the microseismic monitoring sensors 42 are connected with the multi-channel dynamic data acquisition instrument 21 through data signal lines.
The microseismic monitoring sensor 42 can be velocity type or acceleration type, and is connected to the multi-channel dynamic data acquisition instrument 21 through a data signal line to realize the real-time acquisition of microseismic signals. The industrial control system of the high-pressure water injection pump 3 and the industrial controller 22 in the industrial control box 2 are connected through a data signal line, so that the real-time acquisition and regulation of the working parameters of the high-pressure water injection pump 3 are realized.
As shown in fig. 3, the mobile workstation 11 further comprises a hydraulic fracture propagation range three-dimensional data forming module connected with the data acquisition and analysis module; the hydraulic fracture expansion range three-dimensional data forming module is connected with the display terminal 12; wherein the content of the first and second substances,
the hydraulic fracture expansion range three-dimensional data forming module comprises a microseismic detection signal module 43 connected with the microseismic monitoring sensor 42, a filtering signal processing module 44 connected with the microseismic detection signal module 43, a microseismic arrival time capturing module 45 connected with the filtering signal processing module 44, a seismic source positioning module 46 connected with the microseismic arrival time capturing module 45, a rock mass acoustic velocity module 47 and a monitoring point three-dimensional coordinate module 48 which are respectively connected with the seismic source positioning module 46.
The hydraulic fracture expansion range in the hydraulic fracturing ore rock pretreatment operation process is a very key parameter, and the fracturing effect of the hydraulic fracturing ore rock pretreatment is determined. The hydraulic fracture expansion range in the embodiment of the invention is obtained through a hydraulic fracture expansion range three-dimensional data forming module, and the adopted method is a hydraulic fracture expansion range inversion method based on microseismic monitoring. The hydraulic fracture expansion range determination process is as follows: the micro-seismic detection signal module 43 connected with the micro-seismic monitoring sensors 42 is used for capturing rock fracture micro-signals generated in the hydraulic fracture initiation and expansion processes in the hydraulic fracturing ore rock pretreatment operation process, the number of the micro-seismic monitoring sensors 42 is not less than 5, and the micro-seismic monitoring sensors 42 are spatially arranged in a three-dimensional manner. The acquired signals are filtered and analyzed through the filtering signal processing module 44, arrival time of the signals of all the acquisition channels when the same rock micro-fracture occurs is extracted through the micro-seismic arrival time capturing module 45, the three-dimensional coordinates of all the sensors are monitored by combining the micro-seismic acquired by the monitoring point three-dimensional coordinate module 48, the position of the rock micro-fracture, namely seismic source positioning, is inverted through the rock acoustic wave propagation speed and the like acquired by the rock acoustic wave speed module 47, and finally, the hydraulic fracture expansion range is displayed in a three-dimensional mode.
The high-pressure water pipe parameter monitoring device comprises a pressure transmitter 52 arranged on the high-pressure water pipe 51 and a flow sensor 53 arranged on the high-pressure water pipe 51.
Monitoring the water injection pressure of the high-pressure water pipe 51 through the pressure transmitter 52; the flow sensor 53 monitors the flow rate of water supplied to the high-pressure water pipe 51.
Wherein, the allowable pressure of the pressure transmitter 52 is 50 MPa; the monitoring range of the pressure transmitter 52 is 0 MPa-60 MPa; and/or the allowable pressure of the flow sensor 53 is 50 MPa; the monitoring range of the flow sensor 53 is 0-500L/min. The data is preferable and can be selected according to actual conditions.
Wherein, the output signal of the pressure transmitter 52 is 4-20 mA; and/or the output signal of the flow sensor 53 is 4-20 mA.
The industrial control box 2 further comprises an analog quantity module 23; the analog quantity module 23 is connected to the industrial controller 22. The regulation and control of the high-pressure water injection pump 3 are simulated through the analog quantity module 23.
As shown in fig. 4, in the process of the pretreatment operation of the hydraulic fracturing rock, if no additional rock micro-fracture signal occurs in the pretreatment regulation and control device of the hydraulic fracturing rock, it is determined that the hydraulic fracture expansion under the current fracturing working condition has reached the limit. The engine speed of the high-pressure water injection pump 3 and a high-pressure outlet valve are regulated and controlled to generate a newly increased rock micro-fracture signal when the injection flow is increased, and water injection and fracturing are continued; and when no new rock micro-fracture signal is generated after the working parameters of the high-pressure water injection pump are regulated, the high-pressure water injection pump 3 can be closed, and the fracturing of the current fracturing section is finished.
In order to better understand the method and the device for regulating and controlling the pretreatment of the hydraulic fracturing ore rock, the following specific experimental example 1 is provided.
Experimental example 1
Taking a certain natural caving method copper mine hydraulic fracturing ore rock pretreatment field test as an example, a hydraulic fracturing ore rock pretreatment regulation and control device is described. The natural caving method mine is about to mine 410 m of middle section ore body, and the height of the middle section is about 120 m. In order to accelerate the collapse rate of the overlying rock and reduce the block rate, a hydraulic fracturing rock pretreatment test is carried out on the first mining area.
The pressure transmitter and the flow sensor are arranged on a high-pressure water pipe of the high-pressure water injection pump. 12 speed sensors are arranged in three horizontal roadway monitoring drill holes in the periphery of the fracturing area, the monitoring drill holes are vertical holes, the hole depth is 2 m, and the diameter of each drill hole is 100 mm.
The signal cables of the pressure transmitter, the flow sensor, the acceleration sensor and the like are connected to a multi-channel dynamic data acquisition instrument in the industrial control box, initial signals of all channels in the mobile workstation are debugged, and low noise and stable waveform of the acquired signals are ensured. A control system interface of the high-pressure water injection pump is connected with an industrial controller of an industrial control box through a signal cable, and starting and stopping of the high-pressure water injection pump, engine rotating speed and the like are controlled based on industrial control software of a mobile workstation.
And (4) putting the assembled packer down to a position to be fractured in the hole, and connecting a high-pressure water injection pipe with a high-pressure water injection pump.
And starting a high-pressure water injection pump through industrial control software, keeping low-flow injection, wherein the injection flow is about 10L/min, and stopping water injection of the packer when the pipeline pressure of the packer is monitored to be about 15 MPa.
And starting a high-pressure water injection pump to inject water into the fracturing section through industrial control software, and realizing the increase of water injection pressure and injection flow by adjusting the engine rotating speed of the high-pressure water injection pump and a high-pressure water outlet valve, wherein the engine rotating speed is about 2000 rpm, the water injection pressure is about 32.5 MPa, and the injection flow is about 310L/min. And (3) analyzing the hydraulic fracture expansion range in real time along with the continuous injection of high-pressure water until no new obvious rock micro-fracture signal is generated.
And adjusting the rotating speed of the high-pressure water injection pump engine through industrial control software to slowly increase the rotating speed, and observing a rock micro-fracture signal in the hydraulic fracture expansion range monitoring system. When the rotating speed is increased to 2500 rpm, the injection flow reaches 330L/min, and at the moment, a rock micro-fracture signal is newly added, and water injection fracturing is continued. After about 5 min, no rock micro-fracture signal is obviously added, and the rotation speed of the engine is further increased to 3000 rpm without change, which indicates that the hydraulic fracture expansion range reaches the limit. And reducing the rotating speed of the high-pressure water injection pump engine through industrial control software, and stopping the high-pressure water injection pump.
According to the method and the device for regulating and controlling the pretreatment of the hydraulic fracturing ore rock, which are provided by the invention, the microseismic signals generated by the microseismic detection equipment are monitored in real time, and the working parameters of the water injection pump are adjusted according to the occurrence condition of the newly increased microseismic signals of the microseismic signals, so that field operating personnel can know the parameters of the whole fracturing process, the centralized management is convenient, and the operating efficiency is improved; the fracturing effect of the pre-treatment process of the hydraulic fracturing ore rock is mastered in real time, and the working parameters and the working state of the water injection pump are adjusted in real time, so that the pre-treatment operation process of the hydraulic fracturing ore rock can be controlled more reasonably and efficiently, and the fracturing efficiency is improved; in conclusion, the real-time monitoring of the parameters of the hydraulic fracturing ore rock pretreatment process and the real-time regulation and control of the operation parameters are facilitated, so that the fine management of the operation process, the real-time display of the fracturing effect, the improvement of the operation efficiency and the like are realized.
The method and apparatus for conditioning the pre-treatment of hydraulic fracturing rock proposed by the present invention are described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications can be made to the method and apparatus for conditioning the pre-treatment of hydraulic fracturing rock without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (9)
1. A method for regulating and controlling the pretreatment of hydraulic fracturing ore rocks is characterized by comprising the following steps:
enabling the water injection pump to work under preset working parameters, and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
if the microseismic signal does not have a new microseismic signal within a first preset time, regulating and controlling the working parameters of the water injection pump to increase the water injection flow of the water injection pump so as to obtain new working parameters of the water injection pump;
enabling the water injection pump to work under the new working parameters, and monitoring a newly added microseismic signal of the microseismic signal generated by the microseismic detection equipment in real time to obtain the occurrence condition of the newly added microseismic signal;
and regulating and controlling the water injection pump according to the occurrence condition of the newly added microseismic signal according to a preset water injection pump regulation and control rule.
2. The method for regulating and controlling the pretreatment of the hydraulic fracturing ore rock according to claim 1, wherein the step of operating the water injection pump under preset operating parameters and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time comprises the following steps:
arranging the microseismic detection equipment on the hydraulic fracturing target at intervals, and arranging a high-pressure water pipe of the water injection pump at a position to be fractured of the hydraulic fracturing target;
starting the water injection pump to enable the water injection pump to work under preset working parameters, and monitoring a micro-seismic signal generated by the micro-seismic detection equipment in real time; the preset working parameters comprise the rotating speed of an engine and a high-pressure water outlet valve.
3. The method for regulating and controlling the pretreatment of the hydraulic fracturing ore rock according to claim 1, wherein after the water injection pump is operated under preset operating parameters and the microseismic signals generated by the microseismic detection equipment arranged on the hydraulic fracturing target are monitored in real time, the method further comprises the following steps:
and carrying out positioning analysis on the monitored position of the microseismic signal in real time, and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target.
4. The method for conditioning pretreatment of hydraulic fracturing ore according to claim 3, wherein the real-time location analysis of the monitored location of the microseismic signal and the determining of the extension range of the hydraulic fracture on the hydraulic fracturing target comprises:
carrying out filtering signal processing on the microseismic signal to obtain a filtered microseismic signal;
carrying out inversion processing on the micro-fracture of the hydrofracturing target according to the capture time of the filtered microseismic signal, the pre-acquired acoustic wave speed of the hydrofracturing target and the pre-acquired three-dimensional coordinates of the detection point to obtain the seismic source position of the filtered microseismic signal;
drawing a three-dimensional graph of the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the seismic source position of the filtered microseismic signal;
and determining the expansion range of the hydraulic fracture on the hydraulic fracturing target according to the three-dimensional graph of the expansion range of the hydraulic fracture.
5. The method for pretreating, regulating and controlling hydraulic fracturing ore rock according to claim 4, wherein the microseismic detection device is a microseismic monitoring sensor;
the microseismic monitoring sensors are spatially arranged in a three-dimensional manner.
6. The method for regulating and controlling the pretreatment of the hydraulic fracturing ore rock according to claim 1, wherein if the microseismic signal does not have a new microseismic signal within a first preset time, the method for regulating and controlling the working parameters of the water injection pump so as to increase the water injection flow of the water injection pump and obtain the new working parameters of the water injection pump comprises the following steps:
if the microseismic signals do not have newly increased microseismic signals within a first preset time, acquiring water injection fracturing parameters of the water injection pump corresponding to the preset working parameters;
regulating and controlling the working parameters of the water injection pump by regulating and controlling the engine speed and a high-pressure water outlet valve of the water injection pump according to the preset working parameters and the water injection fracturing parameters, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained; wherein the water flooding fracturing parameters include: water injection pressure and water injection flow.
7. The method as claimed in claim 6, wherein the step of obtaining the water injection fracturing parameters of the water injection pump corresponding to the preset working parameters if the micro-seismic signals are not newly added within a first preset time comprises:
and acquiring the water injection pressure and the water injection flow of the water injection pump corresponding to the preset working parameters through a pressure sensor and a flow sensor which are arranged on the water injection pump respectively.
8. The method for conditioning the pretreatment of hydraulic fracturing ore rock according to claim 1,
presetting a water injection pump regulation rule comprises:
if the occurrence condition of the newly added microseismic signal is as follows: controlling the water injection pump to stop working if no new microseismic signal appears within a second preset time, and completing the fracturing work of the hydraulic fracturing target in the current fracturing section;
if the occurrence condition of the newly added microseismic signal is as follows: and in a second preset time, if a new micro-seismic signal appears, the water injection pump continues to work under the new working parameter, and the micro-seismic signal generated by the micro-seismic detection equipment is monitored in real time.
9. A hydraulic fracturing ore rock pretreatment regulation and control device, its characterized in that, the device includes:
the real-time monitoring module is used for enabling the water injection pump to work under preset working parameters and monitoring microseismic signals generated by microseismic detection equipment arranged on a hydraulic fracturing target in real time;
the working parameter regulating and controlling module is used for regulating and controlling the working parameters of the water injection pump if the microseismic signal does not have a new microseismic signal within a first preset time, so that the water injection flow of the water injection pump is increased, and new working parameters of the water injection pump are obtained;
the newly added microseismic signal monitoring module is used for enabling the water injection pump to work under the new working parameters and monitoring newly added microseismic signals of the microseismic signals generated by the microseismic detection equipment in real time to obtain the appearance condition of the newly added microseismic signals;
and the water injection pump regulation and control module is used for regulating and controlling the water injection pump according to the occurrence condition of the newly added microseismic signal according to a preset water injection pump regulation and control rule.
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