CN116498284A - Fracturing simulation system and acoustic emission probe detection device - Google Patents
Fracturing simulation system and acoustic emission probe detection device Download PDFInfo
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- CN116498284A CN116498284A CN202211362843.7A CN202211362843A CN116498284A CN 116498284 A CN116498284 A CN 116498284A CN 202211362843 A CN202211362843 A CN 202211362843A CN 116498284 A CN116498284 A CN 116498284A
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- 238000004088 simulation Methods 0.000 title claims abstract description 123
- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 65
- 238000002347 injection Methods 0.000 claims abstract description 22
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention provides a fracturing simulation system and an acoustic emission probe detection device, which are used for acquiring acoustic emission signals inside a rock sample through an acoustic emission probe and transmitting the acquired acoustic emission signals to a control unit of the fracturing simulation system, so that the control unit monitors the fracturing condition in the rock sample according to the acoustic emission signals sent by a multi-stage liquid injection pipeline device and the acoustic emission signals acquired by the acoustic emission probe, can shorten the path of the acoustic emission signals generated by the rock sample and transmitted to the acoustic emission probe, improves the transmission efficiency of the acoustic emission signals, and can monitor the cracking condition of cracks of each section of shower hole and the liquid feeding condition of fracturing liquid more accurately.
Description
Technical Field
The invention relates to the technical field of physical simulation of hydraulic fracture initiation, in particular to a fracturing simulation system and an acoustic emission probe detection device.
Background
The horizontal well segmented clustering fracturing is one of key technologies for the production increase and reconstruction of unconventional oil and gas reservoirs, hydraulic fracturing cracks are extended in the reservoirs as much as possible to form more complex crack fracture networks, so that more remarkable benefits are obtained, and the method has important significance for improving the development efficiency of the oil and gas reservoirs.
At present, the laboratory indoor fracturing physical simulation research generally adopts a mode of installing an acoustic emission probe on a loading plate to monitor acoustic emission signals generated in the fracturing process, and the analysis and research on the acoustic emission signals can infer the morphological change of cracks in a rock sample so as to infer the damage mechanism and understand the dynamic rule of the initiation and the expansion of hydraulic cracks. However, the monitored fracture section is often integral, and the segmented monitoring cannot be realized, so that the transmission error of the acoustic emission signal is larger. When the acoustic emission probe is not in the rock sample, the propagation path of acoustic emission signals generated by the rock sample in the experimental process is longer, so that the number of acoustic emission signals received by the acoustic emission probe is reduced, the energy level is lowered, and meanwhile, the influence of external environment noise on the signal-to-noise ratio of the acoustic emission signals is also larger, so that the reliability of experimental results is poor.
Therefore, how to effectively modify each fracturing segment of a horizontal well during the fracturing construction, thereby forming high-conductivity artificial fractures or fracture networks, remains a great challenge for unconventional hydrocarbon reservoir development.
Disclosure of Invention
The embodiment of the application provides a fracturing simulation system and acoustic emission probe detection device, gather the inside acoustic emission signal of rock specimen through the acoustic emission probe, and transmit the acoustic emission signal who gathers for the control unit of fracturing simulation system, so that the control unit monitors the fracturing condition in the rock specimen according to the acoustic emission signal that multistage notes liquid pipeline device sent and the acoustic emission signal that the acoustic emission probe gathered, promote acoustic emission signal's transmission efficiency, each section shower hole crack initiation condition and fracturing fluid feed liquor condition that can be more accurate.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the embodiment of the invention provides a fracturing simulation system, which comprises a rock sample, a multi-stage liquid injection pipeline device and a detection device;
a simulated wellbore is arranged in the rock sample;
the detection device comprises a simulation liner tube and a plurality of acoustic emission probes which are arranged on the simulation liner tube in a telescopic way;
at least the part of the simulation liner tube provided with the acoustic emission probe is positioned in the simulation well hole, and the acoustic emission probe is contacted with the rock sample;
one end of the multi-stage liquid injection pipeline device is inserted into the simulation liner tube and used for sending out acoustic emission signals in the liquid injection process;
the acoustic emission probe is used for collecting acoustic emission signals in the rock sample and transmitting the collected acoustic emission signals to the control unit of the fracturing simulation system, so that the control unit monitors the fracturing condition in the rock sample according to the acoustic emission signals sent by the multi-stage liquid injection pipeline device and the acoustic emission signals collected by the acoustic emission probe.
On the basis of the technical scheme, the invention can be improved as follows.
In one possible implementation, a plurality of mounting holes are provided in the outer wall of the simulated liner, each acoustic emission probe being telescopically disposed in one of the mounting holes.
In one possible implementation manner, the mounting hole comprises a first through hole and a second through hole, the aperture of the first through hole is larger than that of the second through hole, a step surface is formed between the first through hole and the second through hole, and the first through hole and the second through hole are communicated with the inside of the simulation liner tube;
further comprises: one end of the elastic piece is connected with the acoustic emission probe, and the other end of the elastic piece is connected with the inner wall of the second through hole;
the acoustic emission probe is telescopically positioned in the first through hole through the elastic piece.
In one possible implementation, the hole depth of the first through hole is greater than the thickness of the acoustic emission probe, and there is a space between the acoustic emission probe and the step surface.
In one possible implementation manner, a plurality of wiring grooves are formed in the inner wall of the simulation liner tube, one end of each wiring groove is communicated with the corresponding mounting hole, and the other end of each wiring groove extends to one end of the simulation liner tube facing the outside of the rock sample;
and a lead is arranged in the wiring groove, one end of the lead is electrically connected with the corresponding acoustic emission probe, and the other end of the lead is electrically connected with a control unit of the fracturing simulation system.
In one possible implementation, the plurality of acoustic emission probes are distributed helically along the axial direction of the simulated liner on the outer wall of the simulated liner.
In one possible implementation, the acoustic emission probe further comprises a coupling layer formed by a coupling agent, the coupling layer being arranged on a side of the acoustic emission probe in contact with the rock sample.
In one possible implementation, the method further includes: the display terminal is provided with a control unit of the fracturing simulation system;
alternatively, the fracturing simulation system is a true triaxial hydraulic fracturing simulation system.
The embodiment of the invention also provides an acoustic emission probe detection device for the inside of the fracturing test sample, which is applied to the fracturing simulation system;
the acoustic emission probe detection device comprises a simulation liner tube and a plurality of acoustic emission probes which are arranged on the simulation liner tube in a telescopic way;
the simulation liner is used for being arranged in a simulation well hole in a rock sample of the fracturing simulation system, and the acoustic emission probe is contacted with the rock sample;
the acoustic emission probe is used for collecting acoustic emission signals in the rock sample and transmitting the collected acoustic emission signals to a control unit of the fracturing simulation system.
In one possible implementation, a plurality of mounting holes are formed in the outer wall of the simulated liner tube;
the mounting hole comprises a first through hole and a second through hole, the aperture of the first through hole is larger than that of the second through hole, a step surface is formed between the first through hole and the second through hole, and the first through hole and the second through hole are communicated with the inside of the simulation liner tube;
further comprises: one end of the elastic piece is connected with the acoustic emission probe, and the other end of the elastic piece is connected with the inner wall of the second through hole;
the acoustic emission probe is telescopically positioned in the first through hole through the elastic piece.
The embodiment of the invention provides a fracturing simulation system, which is used for acquiring acoustic emission signals in a rock sample through an acoustic emission probe and transmitting the acquired acoustic emission signals to a control unit of the fracturing simulation system, so that the control unit monitors the fracturing condition in the rock sample according to the acoustic emission signals sent by a multi-stage liquid injection pipeline device and the acoustic emission signals acquired by the acoustic emission probe, the transmission efficiency of the acoustic emission signals is improved, and the cracking condition of cracks of shower holes and the liquid feeding condition of fracturing liquid in each stage can be monitored more accurately.
The embodiment of the invention also provides an acoustic emission probe detection device which is used for the inside of the fracturing test sample and is applied to the fracturing simulation system, and the acoustic emission probe detection device comprises a simulation liner tube and a plurality of acoustic emission probes which are arranged on the simulation liner tube in a telescopic manner;
the simulation liner is used for being arranged in a simulation well hole in a rock sample of the fracturing simulation system, and the acoustic emission probe is contacted with the rock sample;
the acoustic emission probe is used for collecting acoustic emission signals in the rock sample and transmitting the collected acoustic emission signals to a control unit of the fracturing simulation system.
The acoustic emission probe detection device provided by the embodiment of the invention has the advantages of simple structure, convenience in processing, repeated utilization of the acoustic emission probe detection device and the rock sample by adopting plug-in connection, great cost saving, simplification of the operation flow of a fracturing simulation experiment and improvement of the efficiency of the fracturing simulation experiment. The experimental result can provide theoretical basis for the construction design of staged fracturing of the horizontal well of the mine.
In one possible implementation, a plurality of mounting holes are formed in the outer wall of the simulated liner tube;
the mounting hole comprises a first through hole and a second through hole, the aperture of the first through hole is larger than that of the second through hole, a step surface is formed between the first through hole and the second through hole, and the first through hole and the second through hole are communicated with the inside of the simulation liner tube;
further comprises: one end of the elastic piece is connected with the acoustic emission probe, and the other end of the elastic piece is connected with the inner wall of the second through hole;
the acoustic emission probe is telescopically positioned in the first through hole through the elastic piece.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a detection device for a fracturing simulation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a structure of fitting a mounting hole in a detection device according to an embodiment of the present invention;
FIG. 3 is a schematic view in partial cross-section along the A-A direction in FIG. 2;
fig. 4 is a schematic view of a structure in which a coupling layer is provided on the acoustic emission probe in fig. 3.
Reference numerals illustrate:
100-fracturing simulation system;
110-rock sample; 111-simulating a wellbore;
120-multistage liquid injection pipeline device;
130-detecting means; 131-simulating a liner; 132-acoustic emission probe; 133-mounting holes; 134-elastic member; 135-wiring grooves; 136-lead wire; 1331-a first through hole; 1332-a second through hole; 1333-step surface;
140-coupling layer.
Detailed Description
As described in the background art, in the fracturing physical simulation research of the present stage, through the acquisition, processing and analysis research of acoustic emission signals, the morphological change of the fracture in the rock sample can be deduced, so that the damage mechanism of the fracture is deduced, and the dynamic rule of the hydraulic fracture initiation and expansion is known. However, the monitored fracture section is often integral, and the segmented monitoring cannot be realized, so that the transmission error of the acoustic emission signal is larger. In addition, when the acoustic emission probe is not in the rock sample, the propagation path of acoustic emission signals generated by the rock sample in the experimental process is longer, so that the quantity of the acoustic emission signals received by the acoustic emission probe is reduced, and the energy level is reduced.
In view of the above technical problems, embodiments of the present invention provide a fracturing simulation system 100, where the fracturing simulation system 100 includes a rock sample 110, a multi-stage liquid injection pipeline device 120 and a detection device 130; the rock sample 110 is internally provided with a simulated borehole 111, the detection device 130 comprises a simulated liner tube 131 and a plurality of acoustic emission probes 132 which are telescopically arranged on the simulated liner tube 131, at least the part of the simulated liner tube 131 provided with the acoustic emission probes 132 is positioned in the simulated borehole 111, the acoustic emission probes 132 are in contact with the rock sample 110, and one end of the multi-stage liquid injection pipeline device 120 is inserted into the simulated liner tube 131 and used for sending acoustic emission signals in the liquid injection process; the acoustic emission probe 132 is used for collecting acoustic emission signals in the rock sample 110, and transmitting the collected acoustic emission signals to a control unit (not shown in the figure) of the fracturing simulation system 100, so that the control unit monitors the fracturing condition in the rock sample 110 according to the acoustic emission signals sent by the multi-stage injection pipeline device 120 and the acoustic emission signals collected by the acoustic emission probe 132, thus, the path of the acoustic emission signals generated by the rock sample 110 and transmitted to the acoustic emission probe 132 can be shortened, and the crack initiation condition and the fracturing fluid feeding condition of each section of shower hole crack can be monitored more accurately.
In order to make the above objects, features and advantages of the embodiments of the present invention more comprehensible, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, embodiments of the present invention provide a fracturing simulation system 100, which fracturing simulation system 100 may include a rock sample 110, a multi-stage injection line apparatus 120, and a detection apparatus 130. A simulated wellbore 111 may be provided within the rock sample 110, the simulated wellbore 111 being obtainable by drilling within the rock sample 110. The detection device 130 may include a simulated liner 131 and a plurality of acoustic emission probes 132 disposed on the simulated liner 131, wherein the acoustic emission probes 132 are in a telescoping state. The simulated liner 131 may be inserted inside the simulated wellbore 111, and additionally, at least the portion of the simulated liner 131 where the acoustic emission probe 132 is located in the simulated wellbore 111, ensuring that the acoustic emission probe 132 is in contact with the surface of the rock sample 110.
One end of the multi-stage injection pipeline device 120 is inserted into the simulation liner tube 131 and connected with the inside of the simulation liner tube 131, so that an acoustic emission signal is sent out in the injection process and then collected by the acoustic emission probe 132, the acoustic emission probe 132 transmits the collected acoustic emission signal to a control unit of the fracturing simulation system 100, so that the control unit monitors the fracturing condition in the rock sample 110 according to the acoustic emission signal sent out by the multi-stage injection pipeline device 120 and the acoustic emission signal collected by the acoustic emission probe 132, monitors the fracturing dynamics of a horizontal well in real time, and monitors the feeding, crack initiation and extension conditions of each fracturing section.
With continued reference to fig. 2, in implementations of the present embodiment, the fracturing simulation system 100 may further include a plurality of mounting holes 133, the number of mounting holes 133 may be a plurality, the mounting holes 133 may be disposed on an outer wall of the simulation liner 131, and in some embodiments, the simulation liner 131 may be a hollow cylinder, the mounting holes 133 may be configured to mount and receive the acoustic emission probes 132 such that the acoustic emission probes 132 are telescopically disposed in the mounting holes 133. The material of the simulation liner tube 131 can be stainless acid-resistant steel, and the simulation liner tube 131 made of the stainless acid-resistant steel can ensure enough strength and improve stability of the simulation liner tube 131.
Referring to fig. 2 and 3, the mounting hole 133 may include a first through hole 1331 and a second through hole 1332, wherein the acoustic emission probe 132 is disposed in the first through hole 1331, and an aperture of the first through hole 1331 is matched with a diameter of the acoustic emission probe 132. The first through hole 1331 is located at the upper end of the second through hole 1332, and the aperture of the first through hole 1331 is larger than that of the second through hole 1332, and the apertures of the first through hole 1331 and the second through hole 1332 are different, so that a step surface 1333 is formed between the first through hole 1331 and the second through hole 1332, and in addition, the first through hole 1331 and the second through hole 1332 are communicated with the inside of the simulation liner tube 131.
In some embodiments, the mounting hole 133 may further include an elastic member 134, one end of the elastic member 134 is connected to the acoustic emission probe 132, the other end of the elastic member 134 is connected to the inner wall of the second through hole 1332, the elastic member 134 is integrally disposed inside the second through hole 1332, and the aperture of the second through hole 1332 is matched with the diameter of the elastic member 134, so that the acoustic emission probe 132 stretches up and down in the first through hole 1331 through the elastic member 134. The material of the elastic member 134 may be carbon spring steel, so that the elastic member 134 can be elastically deformed with high strength. When the elastic piece 134 is in a working state, the acoustic emission probe 132 is fully contacted with the surface of the rock sample 110 through the extrusion action of the elastic piece 134, so that the transmission efficiency of acoustic emission signals is enhanced.
With continued reference to fig. 3, on the basis of the above embodiment, the hole depth of the first through hole 1331 is greater than the thickness of the acoustic emission probe 132, and a certain interval is provided between the acoustic emission probe 132 and the step surfaces 1333 of the first through hole 1331 and the second through hole 1332, so that the bottom of the acoustic emission probe 132 is not in contact with the step surfaces 1333 all the time. In addition, the top of the acoustic emission probe 132 can extend a predetermined length from the first through hole 1331 through the elastic member 134, so that the acoustic emission probe 132 is in contact with the surface of the rock sample 110.
Referring to fig. 1 and 2, the fracturing simulation system 100 may include a plurality of wiring grooves 135, each wiring groove 135 corresponds to one mounting hole 133, the wiring grooves 135 are disposed on the inside of the simulation liner 131, one end of each wiring groove 135 is communicated with the corresponding mounting hole 133, so that one end of each wiring groove 135 is connected to the acoustic emission probe 132, the other end of each wiring groove 135 extends to one end of the simulation liner 131 facing the outside of the rock sample 110, and an amplifier (not shown) is further disposed at the other end of each wiring groove 135. In one possible implementation, the wiring groove 135 may be semicircular in cross section or rectangular.
In some embodiments, a lead 136 is disposed inside the wiring slot 135, one end of the lead 136 is electrically connected with the acoustic emission probe 132 in the corresponding mounting hole 133, and the other end of the lead 136 is connected with an amplifier, thereby electrically connecting the other end of the lead 136 with the control unit of the fracturing simulation system 100. In one possible implementation, the leads 136 may be secured within the wiring slots 135 by adhesive tape bonding. The arrangement of the wiring grooves 135 can simplify the structure of the dummy liner 131, facilitating wiring. In one possible implementation, the wiring groove 135 is disposed in the middle of the first through hole 1331 and the second through hole 1332, so that one end of the lead wire 136 is connected to the acoustic emission probe 132 without damage.
With continued reference to fig. 2, on the basis of the above embodiment, the plurality of mounting holes 133 are disposed on a different horizontal line, so that the plurality of acoustic emission probes 132 are spirally distributed on the outer wall of the simulation liner 131 along the axial direction of the simulation liner 131, and further, the acoustic emission probes 132 are distributed more uniformly, and the transmission efficiency of the received acoustic emission signals is higher. In one possible implementation, the plurality of mounting holes 133 may also be disposed on the same horizontal line, such that the plurality of acoustic emission probes 132 are horizontally distributed on the outer wall of the simulated liner 131 along the axial direction of the simulated liner 131.
Referring to fig. 4, in addition to the embodiments described above, the fracturing simulation system 100 may include a coupling layer 140, the coupling layer 140 may be applied to the surface of the acoustic emission probe 132 in contact with the rock sample 110, the coupling layer 140 being formed of a couplant, which in one possible implementation may be butter, petrolatum, or the like. The coupling layer 140 enhances the contact effect of the acoustic emission probe 132 with the surface of the rock sample 110 to ensure the number and energy level of acoustic emission signals received by the acoustic emission probe 132.
On the basis of the above embodiment, the fracturing simulation system 100 may further include a display terminal (not shown in the figure), the control unit of the fracturing simulation system 100 is disposed in the display terminal, the inside of the rock sample 110 emits an acoustic emission signal, the acoustic emission probe 132 collects the acoustic emission signal in the rock sample 110, and transmits the collected acoustic emission signal to the control unit of the fracturing simulation system 100, and further transmits the acoustic emission signal to the display terminal through the amplifier, so that the display terminal performs analysis processing on the collected acoustic emission signal. In one possible implementation, the fracturing simulation system 100 is a true triaxial hydraulic fracturing simulation system.
It should be noted that, the diameter of the simulated liner 131 in the fracturing simulation system 100 matches the diameter of the simulated wellbore 111, the diameter of the simulated liner 131 is not larger than the diameter of the simulated wellbore 111, and the length of the simulated liner 131 is consistent with the length of the simulated wellbore 111 so that the simulated liner 131 can be inserted into the simulated wellbore 111.
It will be appreciated that since the resilient member 134 has a high strength, the top of the acoustic emission probe 132 is brought into intimate contact with the surface of the rock sample 110 by the pressure of the resilient member 134, thereby ensuring the number and energy level of acoustic emission signals acquired by the acoustic emission probe 132. In addition, the hole depth of the first through hole 1331 of the mounting hole 133 is larger than the thickness of the acoustic emission probe 132, and a certain interval is formed between the acoustic emission probe 132 and the step surfaces 1333 of the first through hole 1331 and the second through hole 1332, so that the surface contacted by the acoustic emission probe 132 and the elastic piece 134 is always movable by the hole depth allowance of the first through hole 1331.
When the acoustic emission probe 132 in the simulated liner 131 has not been inserted between the simulated wellbores 111, the elastic member 134 is in a free state, and the top of the acoustic emission probe 132 protrudes a predetermined length from the installation hole 133. After the acoustic emission probe 132 in the simulation liner 131 is inserted into the simulation wellbore 111, the elastic piece 134 is in a working state at this time, so that the acoustic emission probe 132 is fully contacted with the interior of the rock sample 110 under the extrusion action of the elastic piece 134, and the quantity and the energy level of acoustic emission signals collected by the acoustic emission probe 132 are ensured. In addition, when the pressure is too high, the elastic member 134 can compress and deform towards the inside direction of the simulated liner 131, so as to drive the acoustic emission probe 132 to move towards the bottom of the first through hole 1331, and ensure that the bottom of the acoustic emission probe 132 is not contacted with the bottom of the first through hole 1331, thereby avoiding damage to the acoustic emission probe 132 caused by the too high pressure.
When a fracturing simulation experiment is performed, the acoustic emission probe 132 is arranged in the first through hole 1331 of the mounting hole 133 on the simulation liner tube 131, the simulation liner tube 131 is inserted into the simulation well hole 111 drilled in the rock sample 110, in addition, one end of the multi-stage liquid injection pipeline device 120 is inserted into the simulation liner tube 131, the multi-stage liquid injection pipeline device 120 is connected with the control unit of the fracturing simulation system 100, acoustic emission signals are emitted inside the rock sample 110 in the liquid injection process, each stage of acoustic emission probe 132 collects the acoustic emission signals, the acoustic emission signals are transmitted to the control unit of the fracturing simulation system 100 through the amplifier connected with the acoustic emission probe 132, and the acoustic emission signals are transmitted to the display terminal through the amplifier, so that the display terminal analyzes and processes the collected acoustic emission signals.
Referring to fig. 2 and 3, embodiments of the present invention also provide an acoustic emission probe detection device for use inside a fracturing test sample that can be used in the fracturing simulation system 100. The acoustic emission probe detection device comprises a simulation liner tube 131 and a plurality of acoustic emission probes 132 which are arranged on the simulation liner tube 131 in a telescopic mode. The simulated liner 131 is for placement in a simulated wellbore 111 within the rock sample 110 of the fracturing simulation system 100, and the acoustic emission probe 132 is in contact with the rock sample 110. The acoustic emission probe 132 is used to collect acoustic emission signals within the rock sample 110 and transmit the collected acoustic emission signals to the control unit of the fracturing simulation system 100. Thus, the acoustic emission probe 132 detection device 130 has a simple structure and is convenient to process, plug-in connection with the rock sample 110 is adopted, the repeated utilization can be realized, the cost is greatly saved, the operation flow of the fracturing simulation experiment is simplified, and the efficiency of the fracturing simulation experiment is improved.
The acoustic emission probe detection device may include a plurality of mounting holes 133, where the number of mounting holes 133 may be a plurality of mounting holes 133 are formed in the outer wall of the simulated liner 131, and in some embodiments, the simulated liner 131 may be a hollow cylinder, where the mounting holes 133 are configured to mount and house the acoustic emission probes 132 such that the acoustic emission probes 132 are telescopically disposed in the mounting holes 133. The material of the simulation liner tube 131 can be stainless acid-resistant steel, and the simulation liner tube 131 made of the stainless acid-resistant steel can ensure enough strength and improve stability of the simulation liner tube 131.
The mounting hole 133 may include a first through hole 1331 and a second through hole 1332, wherein the acoustic emission probe 132 is disposed in the first through hole 1331, and the aperture of the first through hole 1331 is matched with the diameter of the acoustic emission probe 132. The first through hole 1331 is located at the upper end of the second through hole 1332, and the aperture of the first through hole 1331 is larger than that of the second through hole 1332, and the apertures of the first through hole 1331 and the second through hole 1332 are different, so that a step surface 1333 is formed between the first through hole 1331 and the second through hole 1332, and in addition, the first through hole 1331 and the second through hole 1332 are communicated with the inside of the simulation liner tube 131.
The acoustic emission probe detection device may further include an elastic element 134, one end of the elastic element 134 is connected to the acoustic emission probe 132, the other end of the elastic element 134 is connected to the inner wall of the second through hole 1332, the elastic element 134 is integrally disposed inside the second through hole 1332, and the aperture of the second through hole 1332 is matched with the diameter of the elastic element 134, so that the acoustic emission probe 132 stretches up and down in the first through hole 1331 through the elastic element 134. The material of the elastic member 134 may be carbon spring steel, so that the elastic member 134 can be elastically deformed with high strength. When the elastic piece 134 is in a working state, the acoustic emission probe 132 is fully contacted with the surface of the rock sample 110 through the extrusion action of the elastic piece 134, so that the transmission efficiency of acoustic emission signals is enhanced.
In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
It should be noted that references in the specification to "in the detailed description", "in some embodiments", "in this embodiment", "exemplarily", etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.
It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).
It should be noted that in the description of the present invention, the terms "first," "second," and the like are merely used for convenience in describing the various elements and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated.
Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The fracturing simulation system is characterized by comprising a rock sample, a multi-stage liquid injection pipeline device and a detection device;
a simulated wellbore is arranged in the rock sample;
the detection device comprises a simulation liner tube and a plurality of acoustic emission probes which are arranged on the simulation liner tube in a telescopic way;
at least the part of the simulation liner tube, which is provided with the acoustic emission probe, is positioned in the simulation well hole, and the acoustic emission probe is contacted with the rock sample;
one end of the multi-stage liquid injection pipeline device is inserted into the simulation liner tube and used for sending out an acoustic emission signal in the liquid injection process;
the acoustic emission probe is used for collecting acoustic emission signals in the rock sample and transmitting the collected acoustic emission signals to the control unit of the fracturing simulation system, so that the control unit monitors the fracturing condition in the rock sample according to the acoustic emission signals sent by the multi-stage liquid injection pipeline device and the acoustic emission signals collected by the acoustic emission probe.
2. A fracturing simulation system according to claim 1, wherein a plurality of mounting holes are provided in the outer wall of the simulation liner, each of the acoustic emission probes being telescopically arranged in one of the mounting holes.
3. The fracturing simulation system of claim 2, wherein the mounting hole comprises a first through hole and a second through hole, wherein the aperture of the first through hole is larger than that of the second through hole, a step surface is formed between the first through hole and the second through hole, and the first through hole and the second through hole are communicated with the interior of the simulation liner tube;
further comprises: one end of the elastic piece is connected with the acoustic emission probe, and the other end of the elastic piece is connected with the inner wall of the second through hole;
the acoustic emission probe is telescopically located in the first through hole through the elastic piece.
4. A fracturing simulation system according to claim 3, wherein the hole depth of the first through hole is larger than the thickness of the acoustic emission probe, and wherein a space is provided between the acoustic emission probe and the step surface.
5. The fracturing simulation system of any of claims 2-4, wherein a plurality of wiring grooves are formed in the inner wall of the simulation liner, one end of each wiring groove is communicated with the corresponding mounting hole, and the other end of each wiring groove extends to one end of the simulation liner facing the outside of the rock sample;
and a lead is arranged in the wiring groove, one end of the lead is electrically connected with the corresponding acoustic emission probe, and the other end of the lead is electrically connected with the control unit of the fracturing simulation system.
6. The fracturing simulation system of any of claims 1-4, wherein the plurality of acoustic emission probes are helically distributed along the axial direction of the simulated liner on the outer wall of the simulated liner.
7. The fracturing simulation system of any of claims 1-4, further comprising a coupling layer formed of a couplant, the coupling layer being disposed on a side of the acoustic emission probe that contacts the rock sample.
8. The fracturing simulation system of any of claims 1-4, further comprising: the control unit of the fracturing simulation system is positioned in the display terminal;
alternatively, the fracturing simulation system is a true triaxial hydraulic fracturing simulation system.
9. An acoustic emission probe detection device, characterized in that the acoustic emission probe detection device is applied to the fracturing simulation system of any one of the above claims 1-8;
the acoustic emission probe detection device comprises a simulation liner tube and a plurality of acoustic emission probes which are arranged on the simulation liner tube in a telescopic way;
the simulated liner is for placement in a simulated wellbore within a rock sample of the fracturing simulation system, and the acoustic emission probe is in contact with the rock sample;
the acoustic emission probe is used for collecting acoustic emission signals in the rock sample and transmitting the collected acoustic emission signals to the control unit of the fracturing simulation system.
10. The acoustic emission probe testing device of claim 9, wherein,
a plurality of mounting holes are formed in the outer wall of the simulation liner tube;
the mounting hole comprises a first through hole and a second through hole, the aperture of the first through hole is larger than that of the second through hole, a step surface is formed between the first through hole and the second through hole, and the first through hole and the second through hole are communicated with the inside of the simulation liner tube;
further comprises: one end of the elastic piece is connected with the acoustic emission probe, and the other end of the elastic piece is connected with the inner wall of the second through hole;
the acoustic emission probe is telescopically located in the first through hole through the elastic piece.
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