CN104101536A - System and method for detecting internal crack structure of rock - Google Patents
System and method for detecting internal crack structure of rock Download PDFInfo
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Abstract
The invention provides a system and a method for detecting an internal crack structure of rock, and belongs to the field of high-pressure detection. The system for detecting the internal crack structure of rock comprises a CT scanning apparatus, a high-pressure cabin and an air pressure apparatus; the CT scanning apparatus is arranged at the outside of the high-pressure cabin; the CT scanning apparatus is used to perform X-ray detection on a to-be detected sample; and the air pressure apparatus is connected with the interior of the high-pressure cabin via a pipe and is used to inject a gas into the high-pressure cabin and meter the gas flow. By utilizing the system and the method, when the gas is injected, CT scanning detection is performed on the sample. Under the condition of no damage to the detected object, in the form of a two-dimensional cross-sectional image or a three-dimensional stereo image, the structure, the compositions, the texture and the defect status of the interior of the detected object can be clearly accurately finely visually displayed in a multilayer way.
Description
Technical field
The invention belongs to high pressure detection field, be specifically related to a kind of system and method that detects rock interior fissured structure.
Background technology
Industry CT is the abbreviation of industrial computer tomography technology, it can be under to inspected object not damaged condition, form with two-dimensional ct image or three-dimensional image, clear, accurate, careful, to show at many levels, intuitively object to be detected inside structure, composition, material and damaged situation, be described as current best Dynamic Non-Destruction Measurement.But industry CT generally can only be carried out Static Detection to object under normal temperature, condition of normal pressure.
As everyone knows, rock gas in reservoir rock main exist with the hole of rock, crack among, study dark gas field, just need real pressure environment in the reservoir rock of simulate formation depths.By detecting the variation of gassiness rock physical characteristics under different pressures and gas filling condition, can study the generation of gas bearing reservoir, variation and migration etc., its data have important directive significance to the exploitation in gas field.Autoclave is exactly the equipment of this pressure environment of simulation.
Autoclave is actually the high-pressure chamber of a sealing.In storehouse, testing sample is pressurized.Then by the variation of its physical characteristics under different condition of built-in detection device records.Therefore by this device, can measure the characteristic under normal temperature environment under low pressure that is different from that each phase table of sample reveals.In petroleum prospecting research department, want the rock physics feature on real understanding oil, gas stratum, it is a requisite research means.
At present the method for fracture detection has multiplely, such as methods such as CT, ultrasonic imagings, but all methods are only aimed at the crack that rock interior existed, observes, and cannot detect the dynamic process that the crack under different pressures state produces.And at present, in petroleum industry, for example, when unconventional hydrocarbon-bearing pool (shale gas) is exploited, normally by reservoir being carried out to the mode of pressure break, promote yield, therefore the process of study of rocks pressurized cracking, has a very big significance the exploitation of unconventional hydrocarbon-bearing pool.
Summary of the invention
The object of the invention is to solve the difficult problem existing in above-mentioned prior art, a kind of system and method that detects rock interior fissured structure is provided, Industrial Computed Tomography and autoclave are merged, absorb the advantage of two kinds of technology, overcome shortcoming separately, realize more accurate, efficient high pressure physical test of rock.
The present invention is achieved by the following technical solutions:
Detect a system for rock interior fissured structure, comprise CT scan device, high-pressure chamber and pneumatic shuttle;
Described CT scan device is arranged on outside high-pressure chamber; Testing sample is placed in described high-pressure chamber;
Described CT scan device is for carrying out X ray detection to testing sample;
Described pneumatic shuttle accesses in described high-pressure chamber by pipeline, to carrying out gas inject and gas flow metering in high-pressure chamber.
Described high-pressure chamber and testing sample are cylindrical;
The external cylindrical surface of described testing sample is filled in high-pressure chamber after wrapping up with gum cover, the inner cylinder close contact of the outside surface of gum cover and high-pressure chamber;
Two end faces at testing sample are equipped with plug, and described two plugs compress sample;
Two described plugs all have hole and are connected with gas pipeline; Two plug connected gas pipelines all stretch out outside high-pressure chamber, and are connected with described pneumatic shuttle, and gas enters testing sample from the plug of one end, after testing sample, from the plug of the other end, flow out.
The X ray expelling plate of described CT scan device and X ray dash receiver lay respectively at a side of described high-pressure chamber, and both are oppositely arranged, and the ray that X ray expelling plate sends, through after testing sample, is received by X ray dash receiver.
The system of described detection rock interior fissured structure further comprises rotating machinery bracket and stepper motor; Described high-pressure chamber is fixed on rotating machinery bracket, when carrying out X-ray scanning, by stepper motor driven rotary machinery carriage rotation, and then drives high-pressure chamber rotation, and each rotation obtains the scintigram of a face.
The system of described detection rock interior fissured structure further comprises computing machine, and described computing machine is controlled and record data CT scan device, stepper motor and pneumatic shuttle; Specifically, operator is by the running parameter (comprising ray voltages, scanning resolution, scanning total degree) of computer control CT scan device, the startup of stepper motor, stop, speed of rotation, the running parameter of pneumatic shuttle (comprising gas inject pressure, pressing speed, pressing time).In experimentation, by the above parameter of computer recording.
Described computer acquisition penetrates the radial energy value after testing sample, and builds the 3-D view of testing sample.
The shell of described high-pressure chamber adopts high voltage bearing nonmetallic materials manufacture to form.
A method of utilizing the system of described detection rock interior fissured structure to detect, it comprises the following steps:
(1) testing sample after wrapping with gum cover is arranged in high-pressure chamber;
(2) gas inject parameter is set, comprises gas inject pressure, gas pressure balancing time, target pressure value; Scanning total degree N is set, and scanning times is 0;
(3) start pressure process;
(4) testing sample is pressurizeed; Scanning times adds 1;
(5) judge whether to arrive the target pressure value of setting in step (2), in this way, suspend pressurization, carry out CT measurement, then proceed to step (6), as no, return to step (4);
(6) judge whether scanning times reaches scanning total degree N, in this way, has been considered as measurement, and has proceeded to step (7), as no, returns to step (4);
(7) processing and demonstration collection result.
Described step (7) is specific as follows:
Computing machine is converted into numerical signal by the radial energy value collecting, then carries out 3-D view reconstruct according to numerical signal, finally shows the solid figure of testing sample.
Compared with prior art, the invention has the beneficial effects as follows:
1. the present invention can carry out CT scan detection to sample (as rock etc.) in injecting gas, can be under to inspected object not damaged condition, with the form of two-dimensional ct image or three-dimensional image, clear, accurate, careful, to show at many levels, intuitively object to be detected inside structure, composition, material and damaged situation.
2. in the present invention, the top pressure of gas inject can rise to 20 MPas.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention detects the system of rock interior fissured structure.
Fig. 2 is the fundamental diagram that the present invention detects the system of rock interior fissured structure.
Fig. 3 is the step block diagram of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
The system that the present invention detects rock interior fissured structure is a kind of automatic detection device, is that a kind of rock sample detects and note down the process of sample interior fissured structure generation gradual change and sudden change and the system of form by industrial CT scanner precision under by gas filling, extruding.It is high that it has gathered industry CT resolution of scanner, and directly perceived and high-tension unit can produce the feature of high pressure, can realize gas the whole process of rock interior minute fissure extruding expansion is detected.
The present invention is when having adopted gas injection system simulate formation natural gas pool hyperbaric environment, absorbed the high advantage of industry CT scanning system resolution, crack in capable of dynamic, meticulous demonstration testee in by gas filling gradually, extruding situation, the gradual change and sudden change process that inner structure (comprising gap, hole etc.) occurs.
The present invention includes two: system architecture and control flow.
1. system architecture
The system that the present invention narrates can be divided into CT scan part and high-pressure chamber part by its function.CT scan partly completes the X ray of testing sample is detected.High-pressure chamber part realizes carries out gas filling to sample.To the requirement of the shell of high-pressure chamber, be high pressure resistant, simultaneously little to X ray decay.The shell high voltage bearing nonmetallic materials of general employing (as teflon) of high-pressure chamber are manufactured.The voltage endurance capability of shell is also relevant with the thickness of sheathing material.When thickness increases, voltage endurance capability increases, but to the corresponding increase of the absorption of X ray.Now, can solve by increasing X ray emissive porwer.
The present invention adopts floor type high voltage CT scan system architecture.During CT scan, high-pressure chamber is arranged on bracket, drive bracket and high-pressure chamber to rotate, and CT scan system remains static all the time by stepper motor.
As shown in Figure 1, in high pressure CT scan system, high-pressure chamber is arranged on bracket high pressure CT scan system architecture diagram, during X-ray scanning, by stepper motor, drives carriage rotation, and CT scan system remains static all the time.
As shown in Figure 2, high-pressure chamber and sample are cylindrical, the slightly larger in diameter of high-pressure chamber is in sample, sample is put in high-pressure chamber with (except both ends of the surface) after gum cover parcel, guarantee that (gum cover has elasticity for the sample of gum cover parcel and high-pressure chamber close contact, fill in after high-pressure chamber entangling sample, can guarantee gum cover and high-pressure chamber close contact).Sample both ends of the surface use the plug with gas pipeline to compress (in the middle of plug, be perforate, in the middle of hole, access tracheae), guarantee that gas is injected by one end, after sample, from the other end, flow out.
2. control flow
The present invention adopts full-automatic mode by computing machine and interface circuit and corresponding software control gas inject, metering and testing process.
As shown in Figure 3, the inventive method comprises the following steps:
(1) testing sample after wrapping with gum cover is arranged in high-pressure chamber;
(2) gas inject parameter is set, comprises gas inject pressure, gas pressure balancing time, target pressure value;
(3) start pressure process;
(4) testing sample is pressurizeed;
(5) judge whether to arrive the target pressure value of setting in step (2), in this way, suspend pressurization, carry out CT measurement, then proceed to step (6), as no, return to step (4);
(6) judge whether whole measurements complete (before CT measurement starts, set scanning times, when actual measurement reaches preset times, be considered as measuring), in this way, proceed to step (7), as no, return to step (4);
(7) processing and demonstration collection result:
Computing machine is converted into numerical signal by the radial energy value collecting, then carries out 3-D view reconstruct according to numerical signal, finally shows the solid figure of testing sample.
What the present invention applied sample is gaseous tension, and its pressure is by gas being pressed into the crack of sample interior, by the slow pressure break of sample, and detects in real time the process that sample interior produces crack, for the character of study of rocks by the interior other places that causes.
The present invention, by absorbing the advantage of two kinds of technology, forms accurate, efficient physical test of rock system by industry CT scanner and high-pressure chamber.This system can simulate formation gas reservoir rock pressurized environment, under gas filling condition, sample is carried out to XT ray and automatically detects having, and by testing result the form with several solids or plane picture, meticulous, show intuitively.It provides effective detection method and detection means for petroleum prospecting research.
Technique scheme is one embodiment of the present invention, for those skilled in the art, the invention discloses on the basis of application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention, therefore previously described mode is just preferred, and does not have restrictive meaning.
Claims (8)
1. a system that detects rock interior fissured structure, is characterized in that: the system of described detection rock interior fissured structure comprises CT scan device, high-pressure chamber and pneumatic shuttle;
Described CT scan device is arranged on outside high-pressure chamber; Testing sample is placed in described high-pressure chamber;
Described CT scan device is for carrying out X ray detection to testing sample;
Described pneumatic shuttle accesses in described high-pressure chamber by pipeline, to carrying out gas inject and gas flow metering in high-pressure chamber.
2. the system of detection rock interior fissured structure according to claim 1, is characterized in that: described high-pressure chamber and testing sample are cylindrical;
The external cylindrical surface of described testing sample is filled in high-pressure chamber after wrapping up with gum cover, the inner cylinder close contact of the outside surface of gum cover and high-pressure chamber;
Two end faces at testing sample are equipped with plug, and described two plugs compress sample;
Two described plugs all have hole and are connected with gas pipeline; Two plug connected gas pipelines all stretch out outside high-pressure chamber, and are connected with described pneumatic shuttle, and gas enters testing sample from the plug of one end, after testing sample, from the plug of the other end, flow out.
3. the system of detection rock interior fissured structure according to claim 2, it is characterized in that: the X ray expelling plate of described CT scan device and X ray dash receiver lay respectively at a side of described high-pressure chamber, and both are oppositely arranged, the ray that X ray expelling plate sends, through after testing sample, by X ray dash receiver, received.
4. the system of detection rock interior fissured structure according to claim 3, is characterized in that: the system of described detection rock interior fissured structure further comprises rotating machinery bracket and stepper motor; Described high-pressure chamber is fixed on rotating machinery bracket, when carrying out X-ray scanning, by stepper motor driven rotary machinery carriage rotation, and then drives high-pressure chamber rotation.
5. the system of detection rock interior fissured structure according to claim 4, it is characterized in that: the system of described detection rock interior fissured structure further comprises computing machine, described computing machine is controlled and record data CT scan device, stepper motor and pneumatic shuttle;
Described computer acquisition penetrates the radial energy value after testing sample, and builds the 3-D view of testing sample.
6. the system of detection rock interior fissured structure according to claim 5, is characterized in that: the shell of described high-pressure chamber adopts high voltage bearing nonmetallic materials manufacture to form.
7. a method of utilizing the system of the detection rock interior fissured structure described in claim 6 to detect, is characterized in that: said method comprising the steps of:
(1) testing sample after wrapping with gum cover is arranged in high-pressure chamber;
(2) gas inject parameter is set, comprises gas inject pressure, gas pressure balancing time, target pressure value; Scanning total degree N is set, and scanning times is 0;
(3) start pressure process;
(4) testing sample is pressurizeed; Scanning times adds 1;
(5) judge whether to arrive the target pressure value of setting in step (2), in this way, suspend pressurization, carry out CT measurement, then proceed to step (6), as no, return to step (4);
(6) judge whether scanning times reaches scanning total degree N, in this way, has been considered as measurement, and has proceeded to step (7), as no, returns to step (4);
(7) processing and demonstration collection result.
8. method according to claim 6, is characterized in that: described step (7) is specific as follows:
Computing machine is converted into numerical signal by the radial energy value collecting, then carries out 3-D view reconstruct according to numerical signal, finally shows the solid figure of testing sample.
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| CN201310129744.9A CN104101536A (en) | 2013-04-15 | 2013-04-15 | System and method for detecting internal crack structure of rock |
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| CN201310129744.9A CN104101536A (en) | 2013-04-15 | 2013-04-15 | System and method for detecting internal crack structure of rock |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359763A (en) * | 2014-11-20 | 2015-02-18 | 深圳大学 | Method for detecting internal crack developing of cement-based material under action of load |
| CN105758875A (en) * | 2016-03-15 | 2016-07-13 | 山东大学 | Visual simulation method of fracturing rock |
| CN105866006A (en) * | 2016-05-25 | 2016-08-17 | 中国石油天然气股份有限公司 | Tight sandstone crack detecting device and method |
| CN105954104A (en) * | 2016-06-26 | 2016-09-21 | 中国科学院武汉岩土力学研究所 | Rock crack microstructure detection system and method based on PET (Polyethylene Terephthalate)/CT (Computed Tomography) |
| CN106198578A (en) * | 2015-05-30 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of rock core fastener for X-ray detection |
| CN106353177A (en) * | 2015-07-21 | 2017-01-25 | 中国矿业大学(北京) | Industrial CT (Computed Tomography) scanning test system and synchronous rotating device |
| WO2017012465A1 (en) * | 2015-07-21 | 2017-01-26 | 中国矿业大学(北京) | Industrial ct scanning test system |
| CN107153032A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | The compressive strength of rock test system and method for a kind of controllable temperature |
| CN108548832A (en) * | 2018-03-02 | 2018-09-18 | 东南大学 | A kind of concrete three-dimensional cracking characterization apparatus and characterizing method |
| CN109580365A (en) * | 2018-10-19 | 2019-04-05 | 中国科学院地质与地球物理研究所 | High energy acclerator CT rock mechanics testing system |
| CN113295720A (en) * | 2021-05-06 | 2021-08-24 | 中国石油天然气股份有限公司 | Device and method for identifying micron-sized minerals by utilizing CT scanning |
| CN113325009A (en) * | 2020-02-28 | 2021-08-31 | 中国石油天然气股份有限公司 | Rock slice amplifying imaging device, system and method |
| CN116256176A (en) * | 2023-03-24 | 2023-06-13 | 四川大学 | Carbon deposition nondestructive testing method applicable to interior of engine heat exchange channel |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359763A (en) * | 2014-11-20 | 2015-02-18 | 深圳大学 | Method for detecting internal crack developing of cement-based material under action of load |
| CN106198578A (en) * | 2015-05-30 | 2016-12-07 | 中国石油化工股份有限公司 | A kind of rock core fastener for X-ray detection |
| US9891178B2 (en) | 2015-07-21 | 2018-02-13 | China University Of Mining And Technology, Beijing | Industrial CT scanning test system |
| CN106353177B (en) * | 2015-07-21 | 2019-02-26 | 中国矿业大学(北京) | A kind of industry CT scan test system and synchronous rotating device |
| GB2547616B (en) * | 2015-07-21 | 2019-01-09 | Univ China Mining | Industrial CT scanning test system |
| CN106353177A (en) * | 2015-07-21 | 2017-01-25 | 中国矿业大学(北京) | Industrial CT (Computed Tomography) scanning test system and synchronous rotating device |
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| CN107153032A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | The compressive strength of rock test system and method for a kind of controllable temperature |
| CN105758875B (en) * | 2016-03-15 | 2018-08-07 | 山东大学 | A kind of crack rock visual simulation method |
| CN105758875A (en) * | 2016-03-15 | 2016-07-13 | 山东大学 | Visual simulation method of fracturing rock |
| CN105866006A (en) * | 2016-05-25 | 2016-08-17 | 中国石油天然气股份有限公司 | Tight sandstone crack detecting device and method |
| CN105954104A (en) * | 2016-06-26 | 2016-09-21 | 中国科学院武汉岩土力学研究所 | Rock crack microstructure detection system and method based on PET (Polyethylene Terephthalate)/CT (Computed Tomography) |
| CN105954104B (en) * | 2016-06-26 | 2023-03-07 | 中国科学院武汉岩土力学研究所 | Rock crack mesoscopic structure detection system and detection method based on PET/CT |
| CN108548832A (en) * | 2018-03-02 | 2018-09-18 | 东南大学 | A kind of concrete three-dimensional cracking characterization apparatus and characterizing method |
| CN109580365A (en) * | 2018-10-19 | 2019-04-05 | 中国科学院地质与地球物理研究所 | High energy acclerator CT rock mechanics testing system |
| CN113325009A (en) * | 2020-02-28 | 2021-08-31 | 中国石油天然气股份有限公司 | Rock slice amplifying imaging device, system and method |
| CN113295720A (en) * | 2021-05-06 | 2021-08-24 | 中国石油天然气股份有限公司 | Device and method for identifying micron-sized minerals by utilizing CT scanning |
| CN113295720B (en) * | 2021-05-06 | 2023-02-24 | 中国石油天然气股份有限公司 | Device and method for micron-grade mineral identification by utilizing CT scanning |
| CN116256176A (en) * | 2023-03-24 | 2023-06-13 | 四川大学 | Carbon deposition nondestructive testing method applicable to interior of engine heat exchange channel |
| CN116256176B (en) * | 2023-03-24 | 2024-04-16 | 四川大学 | Carbon deposition nondestructive testing method applicable to interior of engine heat exchange channel |
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