CN109374742B - Evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics - Google Patents
Evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics Download PDFInfo
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- CN109374742B CN109374742B CN201710674986.4A CN201710674986A CN109374742B CN 109374742 B CN109374742 B CN 109374742B CN 201710674986 A CN201710674986 A CN 201710674986A CN 109374742 B CN109374742 B CN 109374742B
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Abstract
The invention provides an evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics, which comprises a closed cabin container; the heat shrinkable sleeve is arranged in the inner cavity of the cabin container; the upper ultrasonic probe and the lower ultrasonic probe are respectively arranged at the upper opening and the lower opening of the heat shrinkable sleeve, and the upper ultrasonic probe, the lower ultrasonic probe and the heat shrinkable sleeve form a closed accommodating space for placing a rock core; the ultrasonic generator is arranged outside the cabin container and connected with the upper ultrasonic probe; the oscilloscope is arranged outside the cabin container and connected with the lower ultrasonic probe; the pore pressure device is communicated with the accommodating space and can add pore pressure to the rock core in the accommodating space, and the system can better simulate the formation environment so as to perform a carbonate rock formation rock acoustomechanical response characteristic test.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration, in particular to an evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics.
Background
The marine carbonate rock oil gas resource accounts for about one third of the total amount of resources in China, is an important energy strategy component of China, and is a key field of current and future oil gas exploration and development. The accurate calculation of key geological environmental factors such as the rock mechanical parameters of the reinforced carbonate rock stratum, a formation pressure system (pore pressure, collapse pressure and fracture pressure) and the like is an important foundation of safe and efficient drilling and well completion engineering technology. The inversion of seismic data and the interpretation of logging data are the main means for solving key geological environment factors at present, and the general response rule of acoustic mechanical characteristics is the premise for researching and establishing the solving methods. However, the carbonate rock stratum has complicated ancient geological conditions, and great difficulty is brought to the acquisition of key geological environment factors such as the mechanical parameters of the carbonate rock stratum rock and the formation pressure system (pore pressure, collapse pressure and fracture pressure).
Therefore, an evaluation system needs to be invented to evaluate the carbonate formation rock acoustomechanical response characteristics so as to provide an effective test means for exploring the carbonate formation rock acoustomechanical characteristics.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides an evaluation system for carbonate rock stratum rock acoustomechanical response characteristics. The system can better simulate the formation environment so as to perform the carbonate rock formation rock acoustomechanical response characteristic test.
According to the invention, an evaluation system for carbonate formation rock acoustic mechanical response characteristics is provided, which comprises:
a closed cabin body container is arranged in the cabin body,
a heat shrinkable sleeve arranged in the inner cavity of the cabin container,
an upper ultrasonic probe and a lower ultrasonic probe which are respectively arranged at the upper opening and the lower opening of the heat shrinkable sleeve, wherein the upper ultrasonic probe, the lower ultrasonic probe and the heat shrinkable sleeve form a closed containing space for placing a rock core,
an ultrasonic generator arranged outside the cabin container and connected with the upper ultrasonic probe,
an oscilloscope which is arranged outside the cabin container and is connected with the lower ultrasonic probe,
and the pore pressure device is communicated with the accommodating space and can add pore pressure to the core in the accommodating space.
In one embodiment, the pore pressure device comprises:
a first input pipeline which penetrates through the cabin container and the lower ultrasonic probe and can be communicated with the containing space,
a liquid pore pressure device which is arranged outside the cabin container and is selectively communicated with the first input pipeline,
the gas pore pressure device is arranged outside the cabin container and is selectively communicated with the first input pipeline, and the first output pipeline which penetrates through the cabin container and the upper ultrasonic probe and can be communicated with the containing space and the outside.
In one embodiment, pore pressure sensors are provided on the first input line and the first output line, respectively,
and/or a flow meter is arranged on the first input pipeline,
and/or providing fluid sight holes in the first input line and the first output line.
In one embodiment, the first input pipelines inside and outside the container of the cabin body are respectively provided with a joint,
and/or joints are respectively arranged on the second output pipelines inside and outside the cabin container.
In one embodiment, an upper pressure end cap is disposed above the upper ultrasonic probe, a driver capable of applying axial pressure to the upper pressure end cap is disposed above the upper pressure end cap, a lower pressure end cap is disposed below the lower ultrasonic probe, and a pressure sensor is disposed below the lower pressure end cap.
In one embodiment, a pressure enclosure is arranged outside the cabin container, a second input pipeline capable of communicating the pressure enclosure and the inner cavity of the cabin container is arranged at the lower end of the cabin container, and a second output pipeline capable of communicating the inner cavity of the cabin container and the outside is arranged at the upper end of the cabin container.
In one embodiment, a heating element is disposed in the interior cavity of the chamber container.
In one embodiment, the pod container comprises:
a cylindrical main body, a plurality of cylindrical main bodies,
an upper gland arranged at the upper opening of the body,
a lower gland arranged at the lower opening of the body, a hole communicated with the inside and the outside is arranged on the lower gland,
the hole is provided with a plug in a sealing way.
In one embodiment, a lifting device is provided at the lower end of the closure.
In one embodiment, the upper ultrasonic probe and the lower ultrasonic probe each comprise a first portion with a large cross-sectional area and a second portion with a small cross-sectional area, wherein the two first portions are oppositely arranged and the two second portions are oppositely arranged, and the ratio of the cross-sectional area of the first portion to the cross-sectional area of the second portion is 1.5-2.5.
Compared with the prior art, the rock core accommodating system has the advantages that the accommodating space for accommodating the rock core is formed by the thermal shrinkage sleeve and the upper and lower ultrasonic probes, and the actual working environment of a rock stratum is simulated. The system can complete the acoustic mechanical response characteristic test of the rock core through the ultrasonic generator, the upper ultrasonic probe, the lower ultrasonic probe and the oscilloscope, and is simple in structure and easy to implement.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 shows a schematic diagram of a rating system according to an embodiment of the invention;
FIG. 2 shows a schematic view of a pod container according to one embodiment of the present invention;
FIG. 3 shows a top view of a core according to an embodiment of the invention;
fig. 4 shows a front view of a core unit according to an embodiment of the invention;
in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
FIG. 1 shows an evaluation system 100 for carbonate formation rock acoustomechanical response characteristics according to the present invention. As shown in fig. 1, the system 100 includes a pod container 2, a heat shrink sleeve 2.23, an upper ultrasonic probe 2.5, a lower ultrasonic probe 2.6, an ultrasonic generator 12, an oscilloscope 11, and a pore pressure device 14. Wherein the cabin container 2 is constructed as a closed container with an inner cavity. The heat shrink sleeve 2.23 is arranged in the interior of the cabin container 2. The upper ultrasonic probe 2.5 and the lower ultrasonic probe 2.6 are respectively arranged at the upper opening and the lower opening of the heat shrinkable sleeve 2.23, and form a closed accommodating space 2.29 with the heat shrinkable sleeve 2.23 so as to be used for placing the core 3. The pore pressure device 14 is in communication with the receiving space 2.29 and adds pore pressure to the core 3 located in the receiving space 2.29.
During the test, pore pressure was added to the core 3 by the pore pressure device 14 to simulate a carbonate formation environment. Meanwhile, the ultrasonic transmitter 12 transmits ultrasonic signals with set frequency and intensity, so that the ultrasonic signals are transmitted to the upper ultrasonic probe 2.5, then the upper ultrasonic probe 2.5 transmits the ultrasonic signals to the rock core 3, the ultrasonic signals pass through the rock core 3 and then reach the lower ultrasonic probe 2.6, and the ultrasonic signals reach the oscilloscope 11 through the lower ultrasonic probe 2.6. The oscilloscope 11 displays the condition that the ultrasonic wave passes through the core 3, and the influence of the property of the core 3 and the pore pressure on the propagation speed of the ultrasonic wave is obtained by reading and analyzing the ultrasonic information of the oscilloscope 11.
In a preferred embodiment, the heat shrink wrap 2.23 is made of a heat sensitive PVC material. Such a heat shrink sleeve 2.23 shrinks after a temperature increase to ensure the tightness of the receiving space 2.29.
In a particular embodiment, the pore pressure device 14 includes a first input line 2.30, a liquid pore pressure 8, a gas pore pressure 6, and a first output line 2.31. Wherein one end of the first input pipeline 2.30 passes through the chamber body container 2 and the lower ultrasonic probe 2.6 to be communicated with the lower end of the containing space 2.29 so as to provide pore pressure for the rock core in the containing space 2.29. A fluid pore pressure gauge 8 is disposed outside the tank vessel 2 for delivering pressurized fluid through the first input line 2.30 to simulate formation fluid pore pressure conditions. For example, the liquid pore pressure device 8 may include a liquid sump and a liquid pore pressure pump in communication with the liquid sump. A gas pore pressure gauge 6 is arranged outside the capsule 2 for delivering compressed gas through the first input line 2.30 to simulate formation gas pore pressure conditions. For example, the gas pore pressure 6 may be a gas compression pump disposed at the outside in communication with the air. It should be noted that, depending on the requirements of the test, the liquid pore pressure 8 and the gas pore pressure 6 are selectively connected to the first inlet line 2.30, i.e. the liquid pore pressure 8 and the gas pore pressure 6 cannot be connected to the first inlet line 2.30 at the same time. A first output line 2.31 passes through the tank container 2 and the upper ultrasonic probe 2.5 and communicates with the upper end of the containing space 2.29 to deliver liquid or gas to the outside.
According to the test requirement, in the test process, pressure liquid is pumped to the first input pipeline 2.30 through the liquid pore pressure device 8, enters the lower end of the rock core 3 after passing through the first input pipeline 2.30, and is discharged outside through the first output pipeline 2.31 positioned at the upper end face of the rock core 3 through the crack on the rock core 3. After filling with liquid, the first output pipeline 2.31 is closed to communicate with the outside (for example, a valve for communication or cut-off is arranged thereon), the pore pressure of the required condition is loaded through the liquid pore pressure gauge 8, and the acoustic mechanical response characteristic test is completed through the ultrasonic generator 12, the upper ultrasonic probe 2.5, the lower ultrasonic probe 2.6 and the oscilloscope 11. Similarly, in the test process, when gas pore pressure needs to be added, the first input pipeline 2.30 is communicated with the gas pore pressure device 6, and pressure gas is injected into the rock core 3 through the gas pore pressure device 6. After the core 3 is filled with gas, the first output pipeline 2.31 is cut off from the outside, and the gas is suppressed in the core 3 so as to simulate the actual gas pore pressure condition of the core 3 to complete the acoustic mechanical response test.
In order to understand the fluid pressure conditions on the first input line 2.30 and the first output line 2.31, a pore pressure sensor 2.17 is provided on the first input line 2.30 and the first output line 2.31, respectively, to sense the pressure of the relevant line. Furthermore, a flow meter 2.16 is arranged on the first supply line 2.30 for metering the flow of the fluid through the first supply line 2.30. Fluid observation holes 27 are provided in the first input line 2.30 and the first output line 2.31 to obtain fluid flow information. Whether the core 3 is full of liquid is determined, for example, by observing whether there is a back flow of liquid on the first outlet line 2.31.
For connection and installation convenience, the first supply line 2.30 is arranged in sections, for example, at least in three sections, one section inside the tank container 2, one section through the tank container 2 and one section outside the tank container 2. The sections are connected by joints 2.19. That is, the joints 2.19 are provided on the first supply lines 2.30 inside and outside the tank vessel 2, respectively, so that the differently segmented first supply lines 2.30 are connected to one another to form the first supply lines 2.30. Similarly, the second outlet lines 2.25 inside and outside the cabin container 2 are also provided with connectors 2.19, respectively. Through the arrangement, the operations such as pipeline connection, disassembly or switching can be performed conveniently, and the test efficiency is improved.
In one embodiment, an upper pressure end cap 2.4 is provided above the upper ultrasound probe 2.5. Above the upper pressure end cap 2.4 is arranged a driver 2.36 capable of exerting an axial pressure on the upper pressure end cap 2.4. A lower pressure end cap 2.7 is provided below the lower ultrasonic probe 2.6. A pressure sensor 2.8 is arranged below the lower pressure end cap 2.7. Therefore, axial pressure can be applied to the upper pressure end cap 2.4 through the driver 2.36, and the force is transmitted to the lower pressure end cap 2.7 through the upper ultrasonic probe 2.5, the rock core 3 and the lower ultrasonic probe 2.6 in sequence. At this time, the pressure sensor 2.8 can sense the magnitude of the force. Through the arrangement, axial pressure can be added to the rock core 3, so that the overburden pressure of the stratum is simulated. The influence of the axial pressure on the propagation speed of the ultrasonic wave is obtained by an operation of transmitting an ultrasonic signal or the like while the axial pressure is being applied.
In particular, the actuator 2.36 comprises a shaft pressure pump 10, a hydraulic cylinder 2.27 connected to the shaft pressure pump 10, wherein a piston 2.24 of the hydraulic cylinder 2.27 sealingly penetrates the cabin container 2 in contact with the upper pressure end cap 2.4. The axial pressure pump 10 may be pneumatic or hydraulic. The arrangement is simple and easy to realize.
In one embodiment, a confining pressure device 9 is arranged outside the capsule container 2 for supplying confining pressure to the core 3. For example, the confining pressure 9 may comprise a liquid bath and a confining pressure pump. A second inlet line 2.10 is provided at the lower end of the tank container 2 for communicating the pressurizer 9 with the inner chamber of the tank container 2 for delivering pressure liquid into the inner chamber of the tank container 2. A second output pipeline 2.25 is arranged at the upper end of the cabin container 2 and is used for communicating the inner cavity of the cabin container 2 with the outside so as to convey the liquid in the inner cavity of the cabin container 2. At the same time, a confining pressure sensor 2.11 is arranged on the second input line 2.10 for sensing the fluid pressure. A viewing aperture 27 is provided on the second input line 2.10 and on the second output line 2.25, respectively, to obtain fluid flow information. In the test process, confining pressure fluid enters the inner cavity of the cabin container 2 through the second input pipeline 2.10, after the inner cavity of the cabin container 2 is filled, the fluid is discharged through the second output pipeline 2.25, and the information can be obtained through observation through the observation hole 27. At this time, the communication of the second output line 2.25 with the outside is cut off, and the pressure of the fluid is adjusted by the pressure confining device 9 to load the confining pressure of a certain condition. After the test is finished, the confining pressure fluid is discharged through the second inlet line 2.10. The influence of the change of the confining pressure of the carbonate formation on the sound wave speed can be analyzed through the arrangement.
In one embodiment, a heating element 2.3 is arranged in the interior of the cabin container 2. The heating elements 2.3 are arranged on the inner wall of the cabin container 2 for simulating the temperature conditions of the carbonate formation. Preferably, the heating element 2.3 is a mesh-shaped resistance wire, which is heated by electrical heating. Meanwhile, the heater 2.3 is net-shaped, so that the heating is uniform. The effect of temperature on acoustic velocity in a carbonate formation can be obtained by the above arrangement.
In one embodiment, the pod container 2 includes a body 2.2, an upper gland 2.1, a lower gland 2.9, and a closure 2.14. Wherein the body 2.2 is cylindrical. The upper gland 2.1 is arranged at the upper opening of the body 2.2 and used for plugging the upper opening of the body 2.2. The lower gland 2.9 is arranged at the lower opening of the body 2.2 in a plugging manner. An opening is provided in the lower gland 2.9. A closure member 2.14 is arranged at the opening to close the opening. Meanwhile, a sealing ring 2.15 is arranged between the plug 2.14 and the lower press cover 2.9 at the opening, so as to realize the sealing of the inner cavity of the cabin container 2. After removal of the plug 2.14, the core 3 etc. can be placed in the inner cavity of the cabin container 2. After the plug 2.14 is arranged, the inner cavity of the cabin container 2 is closed to simulate the stratum condition. The structure is simple and easy to realize.
A lifting device 7 is arranged at the lower end of the closure 2.14. Preferably, the lifting device 7 is configured as a hydraulic jack. During the test, the closure 2.14 can be placed at the opening by means of the lifting device 7. Meanwhile, in the axial direction, the lifting device 7 plays a role in supporting each component (the upper ultrasonic probe 2.5, the lower ultrasonic probe 2.6, the rock core 3 and the like).
In a preferred embodiment, the upper and lower ultrasonic probes 2.5, 2.6 each comprise a first portion 2.34 of large cross-sectional area and a second portion 2.35 of small cross-sectional area. That is, the second part 2.35 is configured as a projection of an end face of the first part 2.34. Wherein the two first portions 2.34 are arranged oppositely and the two second portions 2.35 are arranged oppositely. And the cross-sectional area of the first portion 2.34 and the cross-sectional area of the second portion 2.35 are 1.5-2.5. Through this kind set up 2.7 cross sectional areas of holding down pressure end cap, the complete match of 2.4 cross sectional areas of holding up pressure end cap and 3 cross sectional areas of rock core, guarantee that the axle load smoothly transmits for last ultrasonic end cap 2.5 through last pressure end cap 2.4, again by last ultrasonic end cap 2.5 smoothly transmit for rock core 3, with the horizontal and vertical wave signal of the ultrasonic transmitter 12 transmission of guaranteeing to go up ultrasonic end cap 2.5 receipt comprehensively through rock core 3, and by lower ultrasonic end cap 2.6 comprehensive receipt, therefore, the test precision has been improved.
The system 100 also includes an instrument cabinet 1 for receiving the capsule containers 2 and the like. The instrument cabinet 1 is constructed in a square structure. As shown in fig. 1, rollers 31 are provided on the bottom wall of the equipment cabinet 1 to facilitate movement of the system 100. Inside the instrument cabinet 1, a laterally extending support plate 32 is provided. The cabin container 2 is arranged on one side of the interior of the instrument cabinet 1 by means of a support 4 arranged on a support plate 32. The lifting device 7 is arranged on the bottom wall of the equipment cabinet 1, penetrates through the supporting plate 32 and is fixedly connected with the plug 2.14. On the other side of the bottom wall of the interior of the instrument cabinet 1 (the lower end of the support plate 32), a shaft pressure drive 10, a confining pressure device 9 and a liquid pore pressure device 8 are arranged in close proximity. The components such as the oscilloscope 11 and the ultrasonic generator 12 are disposed on the supporting plate 32, and are on the same side of the instrument cabinet 1 as the axial compression driver 10. The arrangement makes the internal structure of the instrument cabinet 1 compact, and optimizes the internal space thereof. Note that the gas pore pressure unit 6 is provided outside the instrument cabinet 1.
During the test, a core 3 of the following structure may be used, as shown in fig. 3. The core 3 comprises at least two core units 30. Each core unit 30 is configured in a columnar shape, and the bottom surface of each core unit 30 is a part of the corresponding bottom surface of the core 3. That is, the core 3 is divided into different core units 30 by a vertical cross section. The core 3 is a split structure composed of core units 30. Meanwhile, as shown in fig. 4, a simulated fracture 39 is configured on at least one core unit 30, and the simulated fracture 39 is configured to communicate with both bottom surfaces of the core unit 30. Because the core 3 is a split structure, the simulated fracture 39 can be arranged on the inner side surface of the core, and then the core units 30 are assembled into the core 3. Thus, this makes it easy to machine the simulated fissure 39, and the size of the simulated fissure 39 to be formed is relatively precise. Meanwhile, after the corresponding test is finished, the sizes and the number of the simulated fractures 39 on the core unit 30 can be modified or increased to simulate different rock formations, so that the test cost is saved, and the test efficiency is improved.
In a preferred embodiment, the core 3 comprises two core units 30 configured as semi-cylinders. The inner surfaces of the two core units 30 are square surfaces, the outer surfaces are semicircular arc surfaces, and the bottom surfaces are semicircular surfaces. During the test, the inner surfaces of the two core units 30 were brought into opposing contact to form the core 3. The structure is simple and the manufacture is convenient. Meanwhile, after the two core units 30 are butted, the simulated fractures 39 on each core unit 30 are symmetrical. The arrangement mode can lead the structure to be simple and the processing to be easy.
The simulated fractures 39 include fractures 33 disposed on the inner surface of the core unit 30 to simulate fractures of the formation core. The slit 33 extends in a semicircular arc toward the outer surface of the core unit 30. That is, the slit 33 has a semi-cylindrical shape. In a preferred embodiment, the width of the fracture 33 (indicated by the letter G in fig. 3) is not greater than 10 mm, for example, 6 mm on a core 3 with a bottom diameter of 38 mm and a height of 76 mm, so as to ensure the strength of the core 3 itself, prevent the core 3 from being damaged during the test and affecting the test results of the core 3. Further, the center point in the longitudinal direction of the fracture 33 coincides with the radial center of the core unit 30. And the minimum distance between the outer circular arc surface of the slit 33 and the outer surface of the core unit 30 is 4 to 7 mm, for example, 5 mm. The included angle formed between the length direction of the fracture 33 and the axial direction of the core unit 30 is 0 to 90 degrees, that is, the length extension direction of the fracture 33 can be adjusted according to the simulated fracture trends of different strata. Of course, the present application is not limited to the above-described dimensional and structural parameters, which may vary depending on the formation to be simulated.
Hemispherical holes 34 may also be provided in the core units 30 on the inner surface to form spherical holes when two semi-cylindrical core units 30 are combined. The bore 34 extends to the outside of the core unit 30. The hole 34 may be used to simulate a hole in a formation core. The particular radial dimension of the aperture 34 may be varied from practice. Preferably, a plurality of holes 34 may be provided on the core unit 30. For ease of machining, the plurality of bores 34 may be aligned radially with the core unit 30, and the bores 34 may be symmetrical about a radial center of the core unit 30. This arrangement reduces the difficulty of machining the core unit 30 and also makes the distribution of the holes 34 more regular to facilitate later summary of the relationship between the test results and the size and number of the holes 34.
In one embodiment, a communication groove 35 is provided on the inner surface of the core unit 30. The communication groove 35 mainly functions as a communication for enabling fluid to flow from one bottom surface of the core 3 to the other after flowing through the fracture 33 and/or the hole 34. The cross-sectional dimension of the communication groove 35 cannot be greater than 3 x 3 mm. That is, the width and depth of the communication groove 35 cannot be larger than 3 mm, for example, the width and depth of the communication groove 35 are 2 mm. The flow area of the communicating groove 35 is small, and the influence on the parameters such as strength and porosity of the whole core 3 is not great. The present application does not limit the specific orientation of the communication grooves 35, as long as communication between the slits 33, and/or between the holes 34, and/or between the slits 33 and the holes 34 is achieved.
In one embodiment, an accommodation groove 36 communicating with the communication groove 35 is provided on the bottom surface of the core unit 30 for receiving and storing fluid. For example, the holding tank 36 may be configured to receive and facilitate the transfer of fluids into the core unit 30 during a pore pressure test. Preferably, the width of the receiving groove 36 is 3 to 5 mm, for example, 4 mm. The depth of the receiving groove 36 is 3 to 5 mm, for example, 4 mm.
In one particular embodiment, an arc-shaped receiving slot 36 is provided on the bottom surface of the core unit 30. Three fractures 33 are provided in the core unit 30. The three fractures 33 are uniformly arranged in the axial direction of the core unit 30. And the slits 33 are parallel to each other. The longitudinal direction of each slit 33 makes an angle of 60 degrees with the axial direction. A hole 34 is provided between two adjacent slits 33. Three holes 34 are provided between two adjacent slits 33, and the three holes 34 are in the same line in the radial direction. Meanwhile, on the inner surface of the core unit 30, a plurality of communication grooves 35 are provided in parallel with the axial direction to achieve communication between the accommodation groove 36, the slit 33, and the hole 34.
According to the present invention, the core unit 30 may be made of metal. The core unit 30 is made of, for example, stainless steel. The arrangement utilizes the advantages of high strength of stainless steel, uniform material, easy processing and the like. At the same time, this arrangement ensures that the test parameters are substantially only related to factors such as the size and number of simulated fractures 39. Of course, the core unit 30 may be made of plastic or glass.
The core 3 adopting the structure can quantitatively simulate the structural sizes of the holes, the seams and the holes of the carbonate rock, can also form the quantitative combination and the shape distribution characteristics of the structures of the holes, the seams and the holes, can inject fluid pressure into the core, has definite acoustic mechanical response characteristics of a core framework, has stronger pressure bearing and temperature resistance capabilities, and meets the requirements of the test on the response relationship between the changes of the structures, the temperatures, the pore fluid pressures, the confining pressures and the vertical pressures of the carbonate rock holes, the seams and the holes and the acoustic characteristics.
The system 100 can simulate complex formation environments such as overburden pressure, horizontal principal stress, formation pore pressure, temperature and fluid states, can test and analyze the influence of single factor changes such as carbonate formation pore pressure on the sound wave speed, and provides an effective test means for scientific research in the aspect of exploring the general response rule of the acoustic mechanical characteristics of the carbonate complex formation.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An evaluation system for carbonate formation rock acoustomechanical response characteristics, comprising:
a closed cabin body container is arranged in the cabin body,
a heat shrinkable sleeve arranged in the inner cavity of the capsule body container,
an upper ultrasonic probe and a lower ultrasonic probe which are respectively arranged at the upper opening and the lower opening of the heat shrinkable sleeve, wherein the upper ultrasonic probe, the lower ultrasonic probe and the heat shrinkable sleeve form a closed containing space for placing a rock core,
an ultrasonic generator arranged outside the cabin container and connected with the upper ultrasonic probe,
an oscilloscope which is arranged outside the cabin container and is connected with the lower ultrasonic probe,
a pore pressure device which is communicated with the containing space and can add pore pressure to the rock core in the containing space,
the upper ultrasonic probe and the lower ultrasonic probe respectively comprise first parts with large cross-sectional areas and second parts with small cross-sectional areas, the two first parts are oppositely arranged, the two second parts are oppositely arranged, and the ratio of the cross-sectional areas of the first parts to the cross-sectional areas of the second parts is 1.5-2.5.
2. The system of claim 1, wherein the pore pressure device comprises:
a first input pipeline which penetrates through the cabin container and the lower ultrasonic probe and can be communicated with the containing space,
a liquid pore pressure device disposed outside the tank body container and selectively communicated with the first input pipeline,
a gas pore pressure gauge disposed outside the capsule enclosure and in selective communication with the first input line,
and the first output pipeline penetrates through the cabin container and the upper ultrasonic probe and can be communicated with the accommodating space and the outside.
3. The system of claim 2, wherein pore pressure sensors are provided on the first input line and the first output line, respectively,
and/or, a flow meter is arranged on the first input pipeline,
and/or, fluid sight holes are provided on the first input line and the first output line.
4. A system according to claim 2 or 3, wherein a joint is provided on the first input line inside and outside the tank vessel, respectively.
5. A system according to any one of claims 1 to 3, wherein an upper pressure end cap is provided above the upper ultrasonic probe, a driver capable of applying axial pressure to the upper pressure end cap is provided above the upper pressure end cap, a lower pressure end cap is provided below the lower ultrasonic probe, and a pressure sensor is provided below the lower pressure end cap.
6. The system according to any one of claims 1 to 3, wherein a pressurizer is disposed outside the tank container, a second input line capable of communicating the pressurizer with the inner cavity of the tank container is disposed at the lower end of the tank container, and a second output line capable of communicating the inner cavity of the tank container with the outside is disposed at the upper end of the tank container.
7. The system of claim 6, wherein connectors are respectively disposed on the second output lines inside and outside the capsule container.
8. A system according to any one of claims 1 to 3, characterized in that a heating element is arranged in the interior of the container of the cabin.
9. The system of any one of claims 1 to 3, wherein the pod container comprises:
a cylindrical main body, a plurality of cylindrical main bodies,
an upper gland arranged at the upper opening of the body,
the lower pressing cover is arranged at the lower opening of the body, a hole communicated with the inside and the outside is formed in the lower pressing cover, and a plugging piece is arranged at the hole in a sealing mode.
10. The system according to claim 9, wherein a lifting device is provided at the lower end of the closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710674986.4A CN109374742B (en) | 2017-08-09 | 2017-08-09 | Evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710674986.4A CN109374742B (en) | 2017-08-09 | 2017-08-09 | Evaluation system for carbonate rock stratum rock acoustic mechanical response characteristics |
Publications (2)
| Publication Number | Publication Date |
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