CN216767359U - Fracturing monitoring experiment device - Google Patents
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- CN216767359U CN216767359U CN202220164787.5U CN202220164787U CN216767359U CN 216767359 U CN216767359 U CN 216767359U CN 202220164787 U CN202220164787 U CN 202220164787U CN 216767359 U CN216767359 U CN 216767359U
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Abstract
A fracture monitoring experiment device, comprising: the experimental tank is filled with sand-shaped particles; the shaft crack model assembly comprises a first conductive section and a second conductive section, wherein one end of the first conductive section is connected with one end of the second conductive section, the first conductive section is arranged in the experiment groove, and the other end of the second conductive section extends out of the experiment groove; the signal transmitting system is electrically connected with the other end, extending out of the experimental groove, of the second conductive segment and is used for transmitting test alternating current; the plurality of potential sensors are all arranged on the upper surface of the sand-shaped particles filled in the experimental groove and are used for acquiring potential difference signals between the shaft crack model assembly and the potential sensors; and the signal receiving system is electrically connected with the plurality of potential sensors and is used for receiving the potential difference signals acquired by the plurality of potential sensors. The method provides a measurement basis for actual fracturing operation, effectively improves the accuracy of measurement results, and improves the measurement efficiency.
Description
Technical Field
The utility model belongs to the field of oil-gas fracturing monitoring, and particularly relates to a fracturing monitoring experimental device.
Background
The fracturing fracture monitoring technology is used for monitoring, testing and evaluating the whole fracturing process of coal bed gas, petroleum, shale gas and the like in real time through certain instruments and technical means, and obtaining the direction, the length, the width, the height and the flow conductivity of a fracture, the filtration coefficient of fracturing fluid, the predicted yield, the calculated fracturing benefit and the like through data processing, so that the fracturing effect is evaluated. Currently, there are two main types of fracture monitoring techniques in common use: ground micro-seismic monitoring technology and potentiometric monitoring technology.
When the resistivity of a geologic volume is much less than the resistivity of surrounding rock, it can be considered approximately as an ideal conductor. When an ideal conductor is located in a generally conductive medium, electricity is supplied (or "charged") to any point on the ideal conductor, and then the current flows to the surrounding medium perpendicular to the surface of the conductor. The charging electric field of an ideal conductor is independent of the position of the charging point and depends only on the magnitude of the charging current, the shape, size, position of the charging conductor and the electrical distribution of the surrounding medium. When a fracturing operation is performed, the fracturing fluid is a solution with an electrolyte, which has a low resistivity relative to the rock surrounding it and is considered to be an ideal conductor. If the electrolytes are charged and the distribution of the charging electric field is observed, the electric distribution condition of the whole underground fracturing fluid and surrounding rocks can be deduced according to the electric distribution condition, so that the advancing and developing condition of the fracturing crack is explained, but the problems are solved when the actual fracturing operation is carried out, so that the problems of inaccurate measuring result, low efficiency and the like are caused.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a fracturing monitoring experimental device which can obtain test data in an experimental environment so as to realize a guiding effect on field layout and improve the accuracy of fracturing field monitoring.
The fracturing monitoring experiment device provided by the embodiment of the utility model comprises:
the experimental tank is filled with sand-shaped particles;
the shaft crack model assembly comprises a first conductive section and a second conductive section, wherein one end of the first conductive section is connected with one end of the second conductive section, the first conductive section is arranged in the experimental groove, and the other end of the second conductive section extends out of the experimental groove;
the signal transmitting system is electrically connected with the other end of the second conductive segment extending out of the experimental groove and used for transmitting test alternating current;
the plurality of potential sensors are all arranged on the upper surface of the sandy particles filled in the experimental groove and are used for acquiring potential difference signals between the shaft crack model assembly and the potential sensors; the sand-like particles are used for fixing the wellbore fracture model assembly and the plurality of the potential sensors in the experimental groove;
and the signal receiving system is electrically connected with the plurality of potential sensors and is used for receiving potential difference signals acquired by the plurality of potential sensors.
The fracturing monitoring experiment device provided by the embodiment of the utility model at least has the following technical effects: the experimental groove plays a role in bearing and simulates the stratum of the nature after being combined with the sand-shaped particles. The shaft crack model component is used for simulating different common shaft types, and the prediction of different conditions occurring in the whole process of the coal bed gas, petroleum and the like in the nature is fully considered. The signal emission system cooperates with a plurality of potentiometric sensors and signal receiving system, and a plurality of potentiometric sensors are arranged on the surface of sandy particle, through gathering the potential difference signal between pit shaft crack model subassembly and the potentiometric sensor to with signal transmission to signal receiving system, and then can utilize gather the potential difference signal many times and carry out the analysis of actual fracturing operation simulation result, use the result of experimental verification to in the actual monitoring, thereby detect for actual scene and provide theoretical guidance. The fracturing monitoring experimental device of the embodiment of the utility model verifies the effect of the oil-gas fracturing monitoring system based on the charging method principle, can simulate the running state of the oil-gas fracturing monitoring system in an experimental environment, provides a measuring basis for actual fracturing operation, effectively improves the accuracy of a measuring result and improves the measuring efficiency.
According to some embodiments of the utility model, the wellbore fracture model assembly comprises:
the metal shaft component comprises a first metal section and a second metal section, one end of the first metal section is connected with one end of the second metal section, and the other end of the second metal section extends out of the experimental groove;
the metal crack members are all arranged in the experimental groove and located in the area where the first metal section is located, and each metal crack member is electrically connected with the first metal section or the second metal section.
According to some embodiments of the utility model, the wellbore fracture model assembly comprises:
the shaft simulation pipe comprises a first pipe section and a second pipe section, one end of the first pipe section is connected with one end of the second pipe section, the other end of the second pipe section extends out of the experiment groove, and a plurality of sieve holes are formed in the first pipe section;
and the liquid supply device is connected with the other end of the second pipe section and is used for filling fracturing liquid into the shaft simulation pipe.
According to some embodiments of the utility model, the wellbore simulating pipe is PVC pipe.
According to some embodiments of the present invention, the first conductive segment and the second conductive segment form an L-shaped structure, and the first conductive segment is horizontally disposed in the experimental tank.
According to some embodiments of the present invention, the plurality of the electric potential sensors are distributed in a # -shaped distribution structure, the # -shaped distribution structure includes a plurality of first linear wires arranged in parallel with each other and a plurality of second linear wires arranged perpendicular to the first linear wires, and the plurality of the electric potential sensors are distributed on the plurality of first linear wires and the plurality of second linear wires.
According to some embodiments of the utility model, a plurality of the first linear lines are all disposed parallel to the first conductive segment.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a fracture simulation of a fracture monitoring experiment apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a static experiment simulation of a fracture monitoring experiment apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a dynamic experiment simulation of a fracture monitoring experiment apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic layout of a potentiometric sensor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of different horizon depth simulations of a fracture monitoring experiment apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic flow diagram of a fracture monitoring experiment method according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a fracture monitoring experiment method according to another embodiment of the utility model.
Reference numerals:
an experimental groove 100,
A metal wellbore member 210, a wellbore simulation tube 220,
A signal transmitting system 300,
A potential sensor 400,
A signal receiving system 500.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
A fracture monitoring experimental apparatus according to an embodiment of the present invention is described below with reference to fig. 1 to 5.
The fracturing monitoring experiment device provided by the embodiment of the utility model comprises: the experimental tank 100, the well bore fracture model assembly, the signal transmitting system 300, the plurality of potential sensors 400 and the signal receiving system 500.
An experimental tank 100 filled with sand-like particles;
the shaft crack model assembly comprises a first conductive section and a second conductive section, wherein one end of the first conductive section is connected with one end of the second conductive section, the first conductive section is arranged in the experimental groove 100, and the other end of the second conductive section extends out of the experimental groove 100;
the signal transmitting system 300 is electrically connected with the other end of the second conductive segment extending out of the experimental tank 100 and is used for transmitting test alternating current;
the plurality of potential sensors 400 are all arranged on the upper surface of the sand-shaped particles filled in the experimental tank 100 and are used for collecting potential difference signals between the shaft crack model assembly and the potential sensors 400; the sand-like particles are used for fixing the wellbore fracture model assembly and the plurality of potential sensors 400 in the experimental tank 100;
the signal receiving system 500 is electrically connected to the plurality of electric potential sensors 400, and the signal receiving system 500 is configured to receive the electric potential difference signals collected by the plurality of electric potential sensors 400.
Referring to fig. 2, 3 and 4, experimental tank 100 may be a sandy soil pit with a length, width and height of 2m × 1m × 2m, and experimental tank 100 is filled with sandy particles. The shaft crack model assembly comprises a first conductive segment and a second conductive segment, wherein the first conductive segment is completely buried under the sand-shaped particles in the experimental groove 100, one end of the second conductive segment is connected with one end of the first conductive segment, part of the second conductive segment is located in the sand-shaped particles, the other end of the second conductive segment extends out of the experimental groove 100, and the end extending out of the experimental groove 100 is connected with the signal emission system 300. The signal transmitting system 300 at least comprises a direct current source and an inverter, wherein the direct current source provides direct current voltage, the inverter inverts the direct current voltage into alternating current voltage for output, the signal transmitting system 300 is provided with two connecting ports (A, B shown in fig. 2 and 3), one end A of the connecting port is connected with the shaft crack model assembly, and the other end B of the connecting port is grounded through an aluminum foil leading-out wire buried at the outer ground surface of the experimental groove 100, so that test alternating current can be output to the shaft crack model assembly.
The plurality of potentiometric sensors 400 are all disposed on the upper surface of the sandy-shaped particles, and corresponding to the plurality of potentiometric sensors 400, the signal receiving system 500 has a plurality of signal receiving terminals (M poles as shown in fig. 2 and 3) and a common terminal (N poles as shown in fig. 2 and 3), and the plurality of signal receiving terminals are electrically connected to the plurality of potentiometric sensors 400, respectively. The signal receiving system 500 also has a ground terminal connected to the far end, i.e., to ground. In addition, the core processor of the signal receiving system 500 may use a single chip, a DSP or an ARM, specifically, an STM32 series processor, for example, STM32F407ZGT6, and further, the signal receiving system 500 may complete receiving of the potential difference signals output by the plurality of potential sensors 400 through an analog-to-digital conversion module.
The signal transmitting system 300 transmits test alternating current, the potential sensors 400 acquire potential difference signals between the shaft crack model assembly and the potential sensors 400, the signal receiving system 500 receives the potential difference signals acquired by the potential sensors 400 to finish acquisition of the potential difference signals, and the simulation data acquisition and analysis of actual fracturing operation can be finished by acquiring data for multiple times and storing the data through the core processor. It should be noted that, in this embodiment, no position limitation nor size limitation is imposed on the opening of the experimental tank 100, and the experiment can be reasonably completed.
According to the fracturing monitoring experiment device provided by the embodiment of the utility model, the experiment groove 100 plays a bearing role and simulates a natural stratum after being combined with sand-shaped particles. The shaft crack model component is used for simulating different common shaft types, and the prediction of different conditions occurring in the whole process of the coal bed gas, petroleum and the like in the nature is fully considered. The signal transmitting system 300, the plurality of potential sensors 400 and the signal receiving system 500 work in a matched mode, the plurality of potential sensors 400 are arranged on the surface of the sand-shaped particles, potential difference signals between the shaft crack model assembly and the potential sensors 400 are collected, the signals are sent to the signal receiving system 500, then the potential difference signals can be collected for multiple times to analyze simulation results of actual fracturing operation, results verified by experiments are applied to actual monitoring, and theoretical guidance is provided for actual site detection. The fracturing monitoring experimental device provided by the embodiment of the utility model verifies the effect of the oil-gas fracturing monitoring system based on the charging method principle, can simulate the running state of the oil-gas fracturing monitoring system in an experimental environment, provides a measurement basis for actual fracturing operation, effectively improves the accuracy of a measurement result, and improves the measurement efficiency.
In some embodiments of the present invention, the plurality of potential sensors 400 are all iron nails, so as to achieve the acquisition of the potential difference signals of the plurality of area points.
In some embodiments of the utility model, the wellbore fracture model assembly comprises a metallic wellbore member 210, a plurality of metallic fracture members. The metal shaft component 210 comprises a first metal section and a second metal section, wherein one end of the first metal section is connected with one end of the second metal section, and the other end of the second metal section extends out of the experiment groove 100; the metal crack members are all arranged in the experimental groove 100 and located in the area where the first metal section is located, and each metal crack member is electrically connected with the first metal section or the second metal section.
Referring to fig. 1, a first metal section is completely embedded in the sand particles of the test cell 100 to simulate a horizontal section of the wellbore, a second metal section partially protrudes from the test cell 100, and a plurality of metal fracture members are disposed around the first metal section to simulate fractures. The metal shaft member 210 and the plurality of metal fracture members adopted in this embodiment may be supported by iron wires having different diameters, specifically, the diameter of the iron wire that the metal shaft member 210 may adopt is about 1mm, the diameter of the iron wire that the plurality of metal fracture members adopt is about 0.5mm, the iron wire having a diameter of 1mm is folded into an L shape, a horizontal section of the iron wire is a first metal section, the length of the iron wire is set to be 1m, a vertical section of the iron wire is a second metal section, and the length of the iron wire is set to be 2 m; the iron wire with a diameter of 0.5mm is bent according to the pattern shown in fig. 1, and has three patterns, i.e., a single slit, a multi-slit, and a mesh slit, respectively, the metal slit member of each pattern is electrically connected to the first metal segment or the second metal segment, and is electrically connected to the first metal segment in fig. 1, but the embodiment is not limited thereto. It should be noted that the material of the metal wellbore member 210 and the plurality of metal fracture members is not limited, and only sufficient conductivity needs to be ensured, and the size of the diameter is not limited, and is reasonable.
In some embodiments of the utility model, the wellbore fracture model assembly includes a wellbore simulation tube 220, a fluid supply device. The shaft simulation pipe 220 comprises a first pipe section and a second pipe section, one end of the first pipe section is connected with one end of the second pipe section, the other end of the second pipe section extends out of the experiment groove 100, and a plurality of sieve holes are formed in the first pipe section; and the liquid supply device is connected with the other end of the second pipe section and is used for filling fracturing liquid into the shaft simulation pipe 220.
Referring to fig. 3, a plurality of sieve holes are formed in different sections of the first pipe section to simulate fracturing perforations, a part of the second pipe section extends out of the experimental groove 100 and extends out of the experimental groove 100, the pipe openings are connected with the liquid supply device, the liquid supply device fills fracturing liquid into the shaft simulation pipe 220, the fracturing liquid needs to be ensured to be in good contact with the signal emission system 300, and the liquid supply device keeps supplying liquid continuously. The infiltration process and the range of the fracturing fluid in the sand-shaped particles at the front part, the middle part and the tail part of the first pipe section effectively simulate the dynamic change process of the fracturing fluid in the fracturing process. It should be noted that the fracturing fluid used in this embodiment may be tap water, but this embodiment does not limit this, and in the case of good conductivity, the fracturing fluid is adjusted according to actual conditions, so that the fracturing fluid is environment-friendly and economical. It should be noted that, in fig. 3, four sieve holes are respectively formed in the front portion, the middle portion and the tail portion of the first pipe section, but the position and the number of the sieve holes are not limited in this embodiment, and the first pipe section is reasonably arranged and can successfully collect data.
In some embodiments of the present invention, the wellbore simulation tubing 220 is PVC tubing. The wellbore simulation pipe 220 adopted in the embodiment is a PVC pipe, and the PVC pipe has strong pressure resistance due to the characteristics of the material thereof, can prevent corrosion of acidic substances and alkaline substances, and has excellent water resistance. And secondly, the PVC pipe is made of a high-quality PVC modified material, and has important physical properties of good flexibility, good flame retardant property, good insulating property, smooth inner wall, small friction coefficient and the like. However, the material of the wellbore simulation pipe 220 is not limited in this embodiment, and may be reasonable.
In some embodiments of the present invention, the first conductive segment and the second conductive segment form an L-shaped structure, and the first conductive segment is horizontally disposed in the experimental tank 100. Referring to fig. 2 and 3, there are two wellbore fracture model members employed in the present embodiment, respectively.
As shown in fig. 1 and 2, the metal wellbore member 210 and a plurality of metal fracture members are adopted as the wellbore fracture model members, wherein the metal wellbore member 210 is bent into an L shape, as shown in fig. 3, the wellbore fracture model members are formed by wellbore simulation pipes 220 and a liquid supply device, wherein two sections of the wellbore simulation pipes 220 are spliced into the L shape. The two L-shaped conductive sections of the metal wellbore member 210 and the wellbore simulation tube 220 both simulate a horizontal well in an actual fracturing operation.
In some embodiments of the present invention, the plurality of electric potential sensors 400 are distributed in a # -shaped distribution structure, the # -shaped distribution structure includes a plurality of first linear wires arranged in parallel to each other and a plurality of second linear wires arranged perpendicular to the first linear wires, and the plurality of electric potential sensors 400 are distributed on the plurality of first linear wires and the plurality of second linear wires.
Referring to fig. 2, 3 and 4, the plurality of electric potential sensors 400 are distributed on the surface of the sand-like particles in a groined distribution structure, wherein the electric potential sensors include a plurality of first linear measuring lines arranged in parallel and a plurality of second linear measuring lines arranged perpendicular to the first linear measuring lines, two first linear measuring lines and two second linear measuring lines are respectively drawn in the figure, but the embodiment does not limit the two measuring lines, and the electric potential sensors are arranged according to the length and the width of the actual shaft fracture model assembly. In addition, the plurality of the electric potential sensors 400 are uniformly distributed on the plurality of first linear measuring lines and the plurality of second linear measuring lines, and the intervals between every two electric potential sensors 400 are consistent, but the present embodiment does not limit the intervals between the electric potential sensors 400, and can perform various transformations.
In some embodiments of the present invention, the plurality of first linear test lines are all disposed parallel to the first conductive segment. Corresponding to the simulated horizontal well, the first conductive segment is parallel to the bottom of the experimental groove 100, i.e. the plurality of first linear measuring lines are all arranged parallel to the bottom of the experimental groove 100.
According to the fracturing monitoring experimental device provided by the embodiment of the utility model, an experimental method is also provided, and the experimental method comprises the following steps:
step S100, arranging an experimental groove 100;
step S200, placing a shaft crack model assembly in the experimental groove 100, wherein the shaft crack model assembly comprises a first conductive section and a second conductive section, and one end of the first conductive section is connected with one end of the second conductive section;
step S300, filling sand-shaped particles into the experiment groove 100, so that the first conductive segment is fixed in the sand-shaped particles, and the other end of the second conductive segment is exposed out of the upper surface of the sand-shaped particles;
step S400, arranging a signal transmitting system 300, electrically connecting one end of the second conductive segment extending out of the experimental tank 100 with the signal transmitting system 300, wherein the signal transmitting system 300 is used for transmitting test alternating current;
step S500, arranging a plurality of potential sensors 400 on the surface of the sand-like particles, and electrically connecting the plurality of potential sensors 400 with a signal receiving system 500;
step S600, the signal transmitting system 300 is started to transmit a test alternating current to the wellbore fracture model assembly, and the signal receiving system 500 is started to receive the potential difference signals collected by the plurality of potential sensors 400.
Referring to fig. 1 to 6, in step S100, the experimental tank 100 may be arranged by digging a sandy soil pit with a length, width and height of 2m × 1m × 2m on a flat ground with sandy soil as a main soil. In step S200, the wellbore fracture model assembly is placed in a suitable position in the experimental tank 100 to ensure the connection of the first conductive segment and the second conductive segment, which is ready for the subsequent steps.
In step S300, after the shaft fracture model assembly is placed, the experimental groove 100 is filled with sand particles until the first conductive segment is completely fixed in the sand particles, the second conductive segment is partially fixed in the sand particles, and the other end of the second conductive segment is exposed out of the upper surface of the sand particles, so as to complete the installation and fixation of the shaft fracture model assembly. It should be noted that, as shown in fig. 5, the wellbore fracture model component may be placed in the experimental tank 100 at different depths according to experimental requirements, or the thickness of the sand-like particle filling is increased while the wellbore fracture model component is placed at the same depth, so as to simulate fracturing at different depths from the ground.
In step S400, the position of the signal transmitting system 300 is not fixed, and the position of the signal transmitting system 300 is reasonably arranged on the premise of ensuring good contact with the end of the second conductive segment extending out of the experimental groove 100.
In step S500, the potential sensors 400 adopted in this embodiment are iron nails with a diameter of 1mm, a plurality of iron nails are inserted into the sand-like particles according to experimental requirements, the nail caps are exposed outside to simulate signal sensing electrodes of the signal receiving system 500, the plurality of potential sensors 400 receive the test electrical signals transmitted from the signal transmitting system 300, collect potential difference signals between the wellbore fracture model assembly and the plurality of potential sensors 400, and transmit the potential difference signals to the signal receiving system 500 for reception.
In step S600, the signal transmitting system 300 and the signal receiving system 500 are activated to cooperate with each other, so that multiple potential difference signal acquisitions can be achieved when different wellbore fracture model assemblies are used, at different depths from the ground, and when other conditions are used as variables.
According to the fracturing monitoring experiment method provided by the embodiment of the utility model, the fracturing monitoring experiment method is applied to the fracturing monitoring experiment device of the first aspect, the experiment groove 100 plays a bearing role, and the stratum in the nature is simulated after sand-shaped particles are combined. The shaft crack model component is used for simulating different common shaft types, and the prediction of different conditions occurring in the whole process of the coal bed gas, petroleum and the like in the nature is fully considered. The signal transmitting system 300, the plurality of potential sensors 400 and the signal receiving system 500 work in a matched mode, the plurality of potential sensors 400 are arranged on the surface of the sand-shaped particles, potential difference signals between the shaft crack model assembly and the potential sensors 400 are collected, the signals are sent to the signal receiving system 500, then the potential difference signals can be collected for multiple times to analyze simulation results of actual fracturing operation, results verified in experiments are applied to actual monitoring, and theoretical guidance is provided for actual field detection. The fracturing monitoring experimental device provided by the embodiment of the utility model verifies the effect of the oil-gas fracturing monitoring system based on the charging method principle, can simulate the running state of the oil-gas fracturing monitoring system in an experimental environment, provides a measurement basis for actual fracturing operation, effectively improves the accuracy of a measurement result, and improves the measurement efficiency.
In some embodiments of the utility model, the wellbore fracture model assembly comprises a wellbore simulation tube 220 and a fluid supply apparatus, the wellbore simulation tube 220 comprising a first tubing section and a second tubing section, one end of the first tubing section being connected to one end of the second tubing section;
prior to placing the wellbore fracture model assembly in the experimental tank 100, further comprising the steps of:
step S110, horizontally arranging a first pipe section in the experimental groove 100;
step S120, filling sand-shaped particles into the experimental groove 100, so that the first pipe section is buried in the sand-shaped particles, and the other end of the second pipe section is exposed out of the upper surface of the sand-shaped particles;
step S130, connecting the liquid supply device with the other end of the second pipe section;
step S140, arranging a signal transmitting system 300, electrically connecting one end of a second pipe section extending out of the experimental tank 100 with the signal transmitting system 300, wherein the signal transmitting system 300 is used for transmitting test alternating current;
step S150, installing a plurality of potential sensors 400 on the surface of the sand-like particles, and connecting the plurality of potential sensors 400 into a signal receiving system 500;
step S160, starting the liquid supply device to continuously inject fracturing liquid into the shaft simulation pipe 220;
step S170, the signal transmitting system 300 is started to transmit test alternating current to the wellbore fracture model assembly, and the signal receiving system 500 is started to receive the background field potential difference signals collected by the plurality of potential sensors 400.
Referring to fig. 1 to 7, the installation and experiment processes of steps S110 to S170 are described in detail previously, and are not repeated herein. It should be noted that the first pipe segment in steps S110 to S170 is complete, and no sieve hole is opened on the first pipe segment, so that the potential difference signal received by the signal receiving system 500 is a background field potential difference signal of the dynamic experiment, and the background field potential difference signal is a data analysis result measured in the normal field of the whole experimental tank 100. The analysis result eliminates the potential difference signal of the fracturing fluid itself filled in the pipeline, and leaves the potential difference signal of the ground surface useful for simulating the actual fracturing operation and the fracturing position near the shaft simulation pipe 220, and the analysis result can be used as an average value to be compared with the potential difference signal measured by a subsequent test field, for example, the potential difference signal changes along with the underground fracturing, so that the electric field changes continuously, the measured value of a ground test point also changes continuously along with the time, and the underground fracturing condition can be reflected according to the comparison result in real time.
In some embodiments of the utility model, placing a wellbore fracture model assembly in the experimental tank 100 comprises the steps of:
removing the wellbore simulation tube 220 from the sand particles;
a plurality of sieve holes are formed in the first pipe section;
repositioning the first pipe section in the experimental tank 100 and backfilling with sandy soil, and enabling the position of the repositioned wellbore simulation pipe 220 in the experimental tank 100 to be consistent with the position of the wellbore simulation pipe 220 in the experimental tank 100 when the background field potential difference signal is acquired;
and continuously injecting fracturing fluid into the shaft simulation pipe 220 through the fluid supply device.
After continuously monitoring the background field potential difference signal for a period of time, the signal transmitting system 300, the signal receiving system 500 and the liquid supply device are stopped, the shaft simulation pipe 220 is taken out from the sand-shaped particles, and a plurality of sieve holes are formed in the first pipe section according to the experiment requirement so as to simulate the test field of the dynamic experiment. After the sieve holes are formed, the shaft simulation tube 220 is fixed at the original position again, then fracturing fluid is continuously injected into the shaft simulation tube 220 through the fluid supply device, and the same position arrangement is used for ensuring that potential difference signal data measured by the dynamic experiment test field and background field potential difference signal data have comparability.
It should be noted that the wellbore fracture model assembly according to the first aspect further includes an embodiment including a metal wellbore member 210 and a plurality of metal fracture members, and this embodiment is used for acquiring potential difference signal data between different fracture contrasts in a static experiment, and also has good experimental significance.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular 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 invention. In this specification, the schematic representations of the terms used above do not necessarily 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.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A fracture monitoring experiment device is characterized by comprising:
an experimental tank (100) filled with sand-like particles;
the shaft crack model assembly comprises a first conductive section and a second conductive section, wherein one end of the first conductive section is connected with one end of the second conductive section, the first conductive section is arranged in the experiment groove (100), and the other end of the second conductive section extends out of the experiment groove (100);
the signal transmitting system (300) is electrically connected with the other end of the second conductive segment extending out of the experiment groove (100) and is used for transmitting test alternating current;
the plurality of potential sensors (400) are all arranged on the upper surface of the sand-shaped particles filled in the experimental tank (100) and are used for acquiring potential difference signals between the shaft fracture model assembly and the potential sensors (400); the sand-like particles are used for fixing the wellbore fracture model assembly and a plurality of the potential sensors (400) in the experimental groove (100);
the signal receiving system (500) is electrically connected with the plurality of potential sensors (400), and the signal receiving system (500) is used for receiving potential difference signals collected by the plurality of potential sensors (400).
2. The fracture monitoring experiment device of claim 1, wherein the wellbore fracture model assembly comprises:
the metal well bore component (210) comprises a first metal section and a second metal section, one end of the first metal section is connected with one end of the second metal section, and the other end of the second metal section extends out of the experimental groove (100);
the metal crack members are all arranged in the experimental groove (100) and located in the area where the first metal section is located, and each metal crack member is electrically connected with the first metal section or the second metal section.
3. The fracture monitoring experiment device of claim 1, wherein the wellbore fracture model assembly comprises:
the shaft simulation pipe (220) comprises a first pipe section and a second pipe section, one end of the first pipe section is connected with one end of the second pipe section, the other end of the second pipe section extends out of the experiment groove (100) to be arranged, and the first pipe section is provided with a plurality of sieve holes;
and the liquid supply device is connected with the other end of the second pipe section and is used for filling fracturing liquid into the shaft simulation pipe (220).
4. The fracturing monitoring experiment device of claim 3, wherein the wellbore simulation tube (220) is a PVC tube.
5. The fracturing monitoring experiment device of claim 1, wherein the first conductive segment and the second conductive segment form an L-shaped structure, and the first conductive segment is horizontally arranged in the experiment groove (100).
6. The fracturing monitoring experiment device of claim 1, wherein the plurality of the electric potential sensors (400) are distributed in a groined type, the groined type distribution structure comprises a plurality of first linear measuring lines arranged in parallel with each other and a plurality of second linear measuring lines arranged perpendicular to the first linear measuring lines, and the plurality of the electric potential sensors (400) are distributed on the plurality of first linear measuring lines and the plurality of second linear measuring lines.
7. The fracture monitoring experimental device of claim 6, wherein the plurality of first linear measuring lines are all arranged in parallel to the first conductive segment.
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| CN115853507A (en) * | 2023-02-16 | 2023-03-28 | 新疆斐德莱布能源科技有限公司 | Horizontal well multi-cluster perforation erosion mine field simulation experiment device and method |
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| CN115853507A (en) * | 2023-02-16 | 2023-03-28 | 新疆斐德莱布能源科技有限公司 | Horizontal well multi-cluster perforation erosion mine field simulation experiment device and method |
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