CN215832913U - Three-dimensional ground stress acquisition system considering rock thermal expansion deformation - Google Patents
Three-dimensional ground stress acquisition system considering rock thermal expansion deformation Download PDFInfo
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- CN215832913U CN215832913U CN202122137964.9U CN202122137964U CN215832913U CN 215832913 U CN215832913 U CN 215832913U CN 202122137964 U CN202122137964 U CN 202122137964U CN 215832913 U CN215832913 U CN 215832913U
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Abstract
The utility model discloses a three-dimensional ground stress acquisition system considering thermal expansion deformation of rocks, which belongs to the technical field of ground stress measurement of rock deformation. By adopting the three-dimensional ground stress acquisition device, the accuracy and the long-term stability of the measurement of the thermal expansion deformation of the rock are improved, the error of the ground stress test result of the inelastic strain recovery method is reduced, and the reliability of the ground stress test result of the inelastic strain recovery method can be greatly improved.
Description
Technical Field
The utility model relates to the technical field of rock deformation (strain) ground stress measurement, in particular to a three-dimensional ground stress acquisition system considering rock thermal expansion deformation.
Background
Geostress is the initial stress present in the earth's crust rock mass and is one of the important physical property parameters of solid earth. The ground stress is a main cause of rock deformation, instability and damage, and is also important data influencing deep energy sources such as hot dry rock and the like, construction parameter selection in shale oil and gas resource exploration and development, hole wall stability analysis, reservoir fracture distribution, oil and gas migration simulation and the like.
At present, the most important means for measuring the ground stress is drilling and coring, an inelastic strain recovery method (ASR method for short) is a ground stress test method based on drilling directional core developed in recent years, has relatively perfect theoretical basis, and has low cost and high efficiency, and particularly under some special conditions, the method is limited by measuring conditions, and other methods can play a greater role when being incapable of being implemented.
The thermal expansion coefficient of rock is one of important thermophysical parameters in the field of geotechnical engineering, and in various ground stress test methods related to rock deformation (strain), the reliability of a test result of the ground stress is influenced to a certain extent due to the thermal expansion (contraction) deformation of the rock caused by temperature change. Particularly in the inelastic strain recovery stress test method, since the inelastic deformation of the rock is relatively small, typically less than 100 microstrain, a temperature change of 1 ℃ will cause a measurement error of about 10%. Therefore, measurement errors caused by temperature changes cannot be ignored.
For the current ASR ground stress test method, on one hand, the temperature in the test process is difficult to be ensured to be unchanged; on the other hand, in the data processing process, the influence of temperature difference is considered, data 2-3 hours before ASR test data are usually deleted or do not participate in calculation, so that effective strain data are greatly wasted, strain begins to recover under the action of a ground stress field after a core is drilled out, a certain time is required for preparing the core from a drilling depth to a ground wellhead laboratory and a test piece, a part of strain is lost, only residual strain can be measured, and therefore it is very important that more effective strain participates in calculation.
In the above method, how to eliminate the influence of temperature is one of the main factors that restrict the reliability of the measurement result of the above method. Therefore, the utility model designs a testing device by considering the influence of thermal expansion (contraction) deformation of the rock caused by temperature change, so as to improve the accuracy and long-term stability of the measurement of the thermal expansion deformation of the rock and greatly improve the reliability of the ground stress test result of the inelastic strain recovery method.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems, the utility model provides a three-dimensional ground stress acquisition system considering rock thermal expansion deformation, which improves the accuracy and long-term stability of rock thermal expansion deformation measurement, reduces the error of a ground stress test result of an inelastic strain recovery (ASR) method and further improves the reliability of the measurement result.
In order to achieve the above purpose, the utility model provides the following technical scheme:
the utility model firstly provides a three-dimensional ground stress acquisition system considering rock thermal expansion deformation, which comprises:
the computer is used for controlling and storing data;
the precise strain recorder is connected with the computer and used for recording temperature and strain data in the constant-temperature water tank;
the data recorder extension scanning box is connected with the precision strain recorder in series and is used for recording temperature and strain data in the variable-temperature water tank;
the first water temperature circulation controller is connected with the computer and used for adjusting the temperature environment of the constant-temperature water tank;
the second water temperature circulation controller is connected with the computer and is used for adjusting the temperature environment of the variable temperature water tank;
the constant-temperature water tank is connected with the first water temperature circulation controller through a first water inlet return water circulation pipeline, a first aluminum alloy calibration sample adhered with a strain gauge, a first temperature sensor and a first rock sample adhered with the strain gauge are placed in the constant-temperature water tank, and the first aluminum alloy calibration sample, the first temperature sensor and the first rock sample are connected with the precise strain recorder through leads;
the temperature-changing water tank is connected with the second water temperature circulation controller through a second water inlet return water circulation pipeline, a second aluminum alloy calibration sample adhered with the strain gauge, a second temperature sensor and a second rock sample adhered with the strain gauge are placed in the temperature-changing water tank, and the second aluminum alloy calibration sample, the second temperature sensor and the second rock sample are connected with the data recorder extension scanning box through leads;
and the heat insulation material is arranged between the constant-temperature water tank and the variable-temperature water tank and is used for isolating the constant-temperature water tank from the variable-temperature water tank.
Compared with the prior art, the utility model has the beneficial effects that:
the three-dimensional ground stress testing device provided by the utility model considers the influence of rock thermal expansion (contraction) deformation caused by temperature change, is provided with the constant-temperature water tank and the variable-temperature water tank which are isolated from each other by temperature, and the precise strain recorder and the data recorder extension scanning box which are connected in series, can calibrate the stability of the testing device and the thermal expansion coefficient of the strain gauge through the alloy standard part with known thermal expansion coefficient, and can improve the precision and long-term stability of rock thermal expansion deformation measurement through the adjustable temperature of the sample sampling spacer, reduce the error of the ground stress testing result of the inelastic strain recovery method, and greatly improve the reliability of the ground stress testing result of the inelastic strain recovery method.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a three-dimensional ground stress testing apparatus according to an embodiment of the present invention.
Fig. 2 is a partially enlarged view of a constant-temperature water tank and a variable-temperature water tank in the system according to the embodiment of the present invention.
Detailed Description
For a better understanding of the present solution, the method of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1-2, the utility model provides a three-dimensional geostress acquiring system considering thermal expansion deformation of rock, which mainly comprises a control and data storage computer 1, a precision strain recorder (temperature and strain) 2, a data recorder extension scanning box (expandable) 3, a first water temperature circulation controller 4 and a second water temperature circulation controller 8, a constant temperature water tank 5, a variable temperature water tank 7, a heat insulating material 6, a first temperature sensor 52, a second temperature sensor and a second temperature sensor 72, a first aluminum alloy calibration sample 51 and a second aluminum alloy calibration sample 71 adhered with strain gauges, a first rock sample 53 adhered with strain gauges and a second rock sample 73 adhered with strain gauges.
The computer 1 for controlling and storing data is connected with the precise strain recorder 2, the precise strain recorder 2 is connected with the data recorder extension scanning box 3 in series, and the precise strain recorder 2 and the data recorder extension scanning box 3 can record the temperature and the strain data of the samples in the constant temperature water tank 5 and the variable temperature water tank 7 at the same time. The constant-temperature water tank 5 is connected with the first water temperature circulation controller 4 through a first water inlet return water circulation pipeline 41, the variable-temperature water tank 7 is connected with the second water temperature circulation controller 8 through a second water inlet return water circulation pipeline 81, the first water temperature circulation controller 4 and the second water temperature circulation controller 8 can respectively adjust the temperature environments of the constant-temperature water tank 5 and the variable-temperature water tank 7, and a heat-insulating material 6 is arranged between the constant-temperature water tank 5 and the variable-temperature water tank 7 for separation; the first aluminum alloy calibration sample 51 adhered with the strain gauge, the first rock sample 53 adhered with the strain gauge and the first temperature sensor 52 are placed in the constant-temperature water tank 5, and the second aluminum alloy calibration sample 71 adhered with the strain gauge, the second rock sample 73 adhered with the strain gauge and the second temperature sensor 72 are placed in the variable-temperature water tank 7.
Specifically, the first rock sample 53 may be prepared by: after the core with the directional mark line taken out from the drill hole is cleaned, the strain gauge is adhered to the surface of the core according to the existing mature ground stress test theory of the inelastic strain recovery method, the first rock sample 53 adhered with the strain gauge is connected with the precise strain recorder 2 through a lead, and then the core is placed in the constant-temperature water tank 5. The second rock sample 73 was prepared by the method of: after the core with the length of 10-20 cm taken out from the drill hole is cleaned, the strain gauge is adhered to the surface of the core sample, the rock sample 73 adhered with the strain gauge is connected with the data recorder expansion scanning box 3 through a lead, and then the core is placed in the variable-temperature water tank 7.
The temperature of the two constant-temperature circulating water bath controllers can be adjusted, for example, the ambient temperature of a constant-temperature water tank (20 ℃) and a variable-temperature water tank (5-60 ℃) are respectively controlled, and the temperature control precision is +/-0.1 ℃. The precise strain recorder 2 and the data recorder extended scanning box 3 are connected in series, can record two water tanks and environmental temperature and sample strain changes simultaneously, and can store data on the computer 1 in real time.
In the testing process of the device, the temperature coefficient of the strain gauge is an important index influencing the reliability of the testing result, and in the embodiment, the precision strain recorder and the temperature coefficient of the precision strain recorder are 1 multiplied by 10, which are produced by the Tokyo detector research institute (TOKYO SOKKI KENKYUIO)-6The precision resistance strain gauge of (1). In the experiment, standard alloy test pieces with known thermal expansion coefficients (such as Al, Mg and Si with the percentage content of 60%, 35% and 5% respectively) are utilized, and the thermal expansion coefficient of the standard alloy test pieces is 22.0-24.0 multiplied by 10 within the range of 20-100 DEG C-6V deg.C), calibrating the stability of the test system and the thermal expansion coefficient of the strain gauge. And testing after calibration.
Specifically, the process of testing by using the device of the utility model comprises the following steps:
first, headFirstly calibrating the stability of the test system and the thermal expansion coefficient of the strain gauge, for example, the calibration method comprises the steps of placing a first aluminum alloy calibration sample 51 adhered with the strain gauge in a constant-temperature water tank 5, placing a second aluminum alloy calibration sample 71 adhered with the strain gauge in a variable-temperature water tank 7, opening a computer 1 and a precise strain recorder 2 of the test system, a first water temperature circulation controller 4 and a second water temperature circulation controller 8, respectively ensuring the temperature conditions of the constant-temperature water tank 5 and the variable-temperature water tank 7 through a first water inlet and return circulation pipeline 41 and a second water inlet and return circulation pipeline 81 by the first water temperature circulation controller 4 and the second water temperature circulation controller 8, starting to record the change rules of the thermal expansion of the first aluminum alloy calibration sample 51 and the second aluminum alloy calibration sample 71 along with time and temperature by the precise strain recorder 2, and displaying the strain of the first aluminum alloy calibration sample 51 under the constant-temperature environment as a calibration result, the thermal expansion of the second aluminum alloy calibration sample 71 is synchronously and linearly increased along with the temperature rise in the temperature changing environment, and the linear thermal expansion coefficient of the alloy is calculated to be 22.0-24.0 multiplied by 10-6The temperature per DEG C is basically consistent with an aluminum alloy standard sample, and the thermal expansion coefficient of the rock obtained by the method is reliable.
The precise strain recorder 2 is used for recording thermal expansion (contraction) strain and water tank temperature change of the rock sample and the strain gauge combination, and in the whole experiment process, the precise strain recorder 2 records strain and temperature change in real time (the sampling interval is adjustable). In order to obtain the change rule of thermal expansion (contraction) strain of the rock along with temperature, the thermal expansion coefficient of the strain gauge is calibrated through an aluminum alloy standard sample in the experiment, and then the linear thermal expansion coefficient of the rock is calculated.
And secondly, opening a computer 1, a precision strain recorder 2 and a second water temperature circulation controller 8 of the test system, ensuring the temperature condition of the variable temperature water tank 7 by the second water inlet return water circulation pipeline 81 through the second water temperature circulation controller 8, starting to record the strain and temperature change of the second rock sample by the precision strain recorder 2, and performing a rule experiment on the change of the linear thermal expansion deformation of the second rock sample along with the temperature and the time. For example, the temperature variation range in the experimental process is 5-60 ℃, every 5 ℃ is a temperature point, in order to make the temperature in the sample reach the equilibrium, each temperature point is kept at the constant temperature for 2-3 hours, and the heating rate of the temperature is about 1 ℃/min.
And thirdly, the second rock sample 73 is subjected to a linear thermal expansion deformation change rule experiment along with temperature and time by utilizing the acquisition device, the temperature change is stable in the whole test process, and the sample is basically linearly changed along with the thermal deformation of the temperature and is synchronous with the temperature change. The linear thermal expansion coefficient of the sample can be obtained according to the change curve of the thermal expansion deformation of the rock sample along with temperature and time. The number of the rock samples can be 2-3, and the linear thermal expansion coefficient of the samples is the average value of the samples.
Opening a computer 1, a precision strain recorder 2 and a first water temperature circulation controller 4 of the acquisition system, ensuring the temperature condition of a constant-temperature water tank 5 by the first water inlet return water circulation pipeline 41 through the first water temperature circulation controller 4, placing a first rock sample 53 adhered with a strain gauge in the constant-temperature water tank 5 for inelastic strain recovery experiment in the device, recording strain and temperature change during sample testing according to the precision strain recorder 2, processing data according to an constitutive equation between inelastic strain and original stress after rock unloading, processing data according to an inelastic strain recovery method ground stress test theory, substituting the measured rock thermal expansion coefficient and temperature difference into the constitutive equation, and considering rock thermal expansion (contraction) deformation influence caused by temperature change to obtain the magnitude of the corrected three-dimensional main stress.
The three-dimensional ground stress testing device provided by the utility model considers the influence of rock thermal expansion (contraction) deformation caused by temperature change, is provided with the constant-temperature water tank and the variable-temperature water tank which are isolated from each other by temperature, and the precise strain recorder and the data recorder extension scanning box which are connected in series, can calibrate the stability of the testing device and the thermal expansion coefficient of the strain gauge through the alloy standard part with known thermal expansion coefficient, and can improve the precision and long-term stability of rock thermal expansion deformation measurement through the adjustable temperature of the sample sampling spacer, reduce the error of the ground stress testing result of the inelastic strain recovery method, and greatly improve the reliability of the ground stress testing result of the inelastic strain recovery method.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A three-dimensional geostress acquisition system taking into account thermal expansion deformations of the rock, comprising:
a computer (1) for control and data storage;
the precise strain recorder (2) is connected with the computer (1) and is used for recording temperature and strain data in the constant-temperature water tank (5);
the data recorder extension scanning box (3) is connected with the precise strain recorder (2) in series and is used for recording temperature and strain data in the variable-temperature water tank (7);
the first water temperature circulating controller (4) is connected with the computer (1) and is used for adjusting the temperature environment of the constant-temperature water tank (5);
the second water temperature circulating controller (8) is connected with the computer (1) and is used for adjusting the temperature environment of the variable temperature water tank (7);
the constant-temperature water tank (5) is connected with the first water temperature circulation controller (4) through a first water inlet return water circulation pipeline (41), a first aluminum alloy calibration sample (51) adhered with a strain gauge, a first temperature sensor (52) and a first rock sample (53) adhered with the strain gauge are placed in the constant-temperature water tank, and the first aluminum alloy calibration sample (51), the first temperature sensor (52) and the first rock sample (53) are connected with the precise strain recorder (2) through leads;
the variable-temperature water tank (7) is connected with the second water temperature circulation controller (8) through a second water inlet return water circulation pipeline (81), a second aluminum alloy calibration sample (71) adhered with a strain gauge, a second temperature sensor (72) and a second rock sample (73) adhered with the strain gauge are placed in the variable-temperature water tank, and the second aluminum alloy calibration sample (71), the second temperature sensor (72) and the second rock sample (73) are connected with the data recorder extension scanning box (3) through leads;
and the heat insulation material (6) is arranged between the constant-temperature water tank (5) and the variable-temperature water tank (7) and is used for isolating the constant-temperature water tank (5) from the variable-temperature water tank (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122137964.9U CN215832913U (en) | 2021-09-06 | 2021-09-06 | Three-dimensional ground stress acquisition system considering rock thermal expansion deformation |
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| CN202122137964.9U CN215832913U (en) | 2021-09-06 | 2021-09-06 | Three-dimensional ground stress acquisition system considering rock thermal expansion deformation |
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