CN113931612A - Stress data test acquisition system and method suitable for local wall stress relief - Google Patents
Stress data test acquisition system and method suitable for local wall stress relief Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B49/003—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 by analysing drilling variables or conditions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B49/02—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 by mechanically taking samples of the soil
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Abstract
The invention discloses a stress data test acquisition system and a method suitable for local wall stress relief, wherein the system comprises a probe device and a data acquisition device, the probe device comprises an upper end cover, a buckle cap, a strain gauge lead, a probe push rod, a spring and a probe base, the strain gauge arranged at the front end of the probe device is driven by a driving device at the rear end of the probe device, the probe device and a side wall stress relief structure simultaneously move towards the wall surface of a sampling section, and the close fit of the front end of the probe device and the wall surface is realized; in the process that the stress relieving structure performs girdling relieving on the rock core, the strain gauge records the strain change condition of a stress relieving area and transmits data to the data acquisition device, the data acquisition device adopts a special sealing waterproof design, the data acquisition circuit board can be protected, data can be transmitted to ground equipment in a high-temperature high-pressure drilling fluid environment, and press type strain measurement is realized.
Description
Technical Field
The invention belongs to the technical field of geotechnical field measurement equipment, and particularly relates to a stress data test acquisition system and method suitable for local wall stress relief.
Background
The local wall stress relieving method is a new stress relieving method, and far-field ground stress can be obtained through back calculation by relieving a sufficient number of cores at the well wall of a drilling well and recording the positive strain changes in different directions in the process. Compared with a hydraulic fracturing method and a traditional stress relieving method, the local wall surface stress relieving method does not need to assume a ground stress field in principle, is small in core relieving length, short in testing time and high in testing success rate, and can be applied to any depth in theory. The ground stress test robot based on the principle of the local wall stress relief method is successfully applied to a plurality of national major projects, and a relatively accurate result is obtained. The existing stress detection equipment suitable for the local wall surface stress relief method adopts glue to stick a stress sheet on a sampling section, relieves the core stress of the sampling section, and tests the ground stress by recording the strain data change of the strain sheet. However, it has the following disadvantages: (1) continuous sampling cannot be done directly: the stress sheet needs to be pasted again in the face of different sampling sections, which wastes time and labor; (2) is not suitable for the complex conditions of deep drilling: when facing to the complex conditions of deep drilling, the defects of insufficient waterproof performance of equipment, incapability of directly testing in the presence of drilling fluid and the like exist; (3) the stress sheet is easy to damage: the high-precision strain gauge is used as a precise electronic component, is easy to cause mechanical system damage in the process of being taken down after being repeatedly pasted, and is very easy to be damaged by rock debris existing in drilling fluid and irregular hole walls when petroleum is drilled; (4) the stress sheet is difficult to be adhered to the surface of the well wall under complex drilling conditions, and the success rate of the adoption of the stress sheet is low. (5) The stress sheet has temperature drift, and the strain measurement value is distorted under the high-temperature condition of well drilling.
Patent CN108547613A provides a device for measuring deep rock mass three-dimensional ground stress, adopts two packers from top to bottom to seal the sampling section, with the well liquid exhaust back, adopts grinding machanism to polish the sampling section wall, makes the wall smooth, constructs the rubber coating to the sampling section through crowded gluey mechanism, and paster mechanism pastes the foil gage in the sampling section, accomplishes the fixed work of whole paster. The device adopts the underground packing technique probably to lead to the wall of a well local to collapse in the shale drilling that the environment is complicated, causes adverse effect to the drilling, and adopts the fixed work of paster that multiunit structure accomplished the foil gage, and overall structure is complicated, has not only increaseed manufacturing cost, and its fault-tolerant rate is also low, is unfavorable for equipment to develop the retest under deep drilling complex condition.
Disclosure of Invention
Aiming at the problems that a stress sheet applied to a stress relief method in the prior art is easy to damage, and equipment loaded with the stress sheet is not suitable for deep drilling under complex conditions, the invention provides a stress data testing and collecting system and a method suitable for local wall surface stress relief.
In order to achieve the above object, according to one aspect of the present invention, a stress data testing and collecting system suitable for local wall stress relief is provided, which includes a probe device for measuring stress in a pressing manner, wherein the probe device includes an upper end cover, a buckle cap, a strain gauge wire, a probe push rod, a spring, and a probe base; one end of the probe push rod is provided with a first annular flange, and the upper end cover is buckled and fixed on the first annular flange through a buckling cap; the upper end cover is made of flexible materials, an upper end cover protruding part penetrating through the buckling cap is arranged at the center of the upper end cover, and the strain gauge is arranged at the bottom of the upper end cover protruding part; the other end of the probe push rod is sleeved in the probe base, and the probe base can axially move along the probe push rod; a second annular flange is arranged on the probe base; two ends of the spring are respectively abutted against and fixed on the first annular flange and the second annular flange; under the drive of an external driving mechanism arranged at one end of the probe base, the probe base pushes a spring to drive a probe push rod to move forwards, so that an upper end cover is always kept in close fit with a well wall of a sampling section in a data sampling stage, a strain gauge can finish data sampling of stress according to the deformation of the upper end cover, sampling data penetrates through the probe push rod and the probe base through a strain gauge wire and is transmitted outwards, and the stress sampling data is transmitted to ground equipment through a data acquisition device; the data acquisition device comprises a sealed wiring bin connected with a strain gauge wire, a circuit bin arranged below the sealed wiring bin and in communication connection with the sealed wiring bin, and a watertight joint arranged at one end of the circuit bin, wherein the ground equipment is in real-time communication with the stress data test acquisition system through the butt joint of the watertight joint and the ground equipment data wire.
Furthermore, the sealing wire cabin comprises a right sealing wire cabin and a left sealing wire cabin which are circumferentially distributed on one end of the circuit cabin.
Further, the right sealing wiring bin comprises a right wiring seat, a right upper cover plate, a right lower cover plate and a strain wire connector; the right side upper cover plate and the right side apron fixed connection form the box body down, are equipped with the cavity in the box and can hold the strain wire and connect, and box body one end is equipped with aperture accessible foil gage wire and connects with strain wire, and the other end is equipped with cylindrical cavity, and it is fixed the box body on right connection terminal front end with the terminal interference fit who locates right connection terminal front end.
Furthermore, the rear end of the right wire holder is provided with a right rear plate, and a sealing ring is arranged on the right rear plate; still be equipped with the cavity that link up the bottom in the wire holder of right side, circuit storehouse and right wire holder laminating department are equipped with the opening.
Furthermore, the sealing wire cabin comprises a right sealing wire cabin and a left sealing wire cabin which are circumferentially distributed on one end of the circuit cabin.
Further, sealed wiring storehouse in a left side includes left wire holder, left upper cover plate, left back lid, strain line joint, left lower cover plate and strain line joint.
Further, left side sealed wiring storehouse structure is the same with right side sealed wiring storehouse, including left wire holder, left upper cover plate, left back lid, strain wire joint, left lower cover plate and strain wire joint.
Furthermore, the stress sheet is adhered to the center of the bottom of the protruding part of the upper end cover by adopting waterproof strain sheet adhesive glue, and the opening of the bottom of the protruding part of the upper end cover is sealed by adopting waterproof glue.
Further, the upper end cover is made of polytetrafluoroethylene.
The invention also provides a stress data test acquisition method suitable for local wall surface stress relief, which comprises the following steps:
s1: the data testing and collecting system is placed to a specified depth and then centered and positioned;
s2: the probe device and the side wall stress relieving structure simultaneously move towards the wall surface of the sampling section under the action of the external driving mechanism, and the close fit between the front end of the probe device and the wall surface is realized under the specified pressure;
s3: in the process that the stress relieving structure performs girdling relieving on the rock core, the strain gauge records the strain change condition of a stress relieving area and transmits data to the data acquisition device;
s4: real-time communication is realized with ground equipment to data acquisition device for underground detection equipment can also realize carrying out the real-time transmission of data to ground in the complex environment of ultra-deep drilling, realizes push type strain measurement.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. according to the stress data test acquisition system, the specially designed probe device is used for protecting the high-precision strain gauge from being damaged by rock debris and irregular hole walls, the strain gauge is subjected to waterproof packaging, and the press type strain measurement is realized under the matching of the spring and the probe push rod, so that the device can be used for directly carrying out tests in a high-temperature high-pressure drilling fluid environment.
2. According to the stress data test acquisition system, the stress sheet with small high-temperature drift precision is selected, the error range of the coefficient of the strain gauge is 0.8 +/-0.5% caused by the influence of temperature within the range of 100 ℃, and the problem that strain measurement is distorted due to temperature drift of the strain gauge in the underground high-temperature environment is effectively solved.
3. According to the stress data testing and collecting system, the upper end cover of the probe device is made of the high-temperature-resistant corrosion-resistant flexible material, the stress data testing and collecting system can adapt to complex environments under drilling wells, can be tightly attached to a wall surface under the action of certain pressure, can adapt to various wall surface environments, can finish stress data sampling according to deformation of the upper end cover by the strain gauge adhered to the center of the bottom of the stress data testing and collecting system, can continuously perform sampling work under the well under the cooperation of the upper end cover and the strain gauge, and greatly improves the stress data sampling efficiency.
4. According to the stress data testing and collecting system, a special sealing and waterproof design is adopted for the data collecting device, so that the stress data testing and collecting system can also realize real-time data transmission in the ultra-deep drilling hole.
5. The underground detection equipment provided with the stress data test acquisition system saves complex mechanisms such as packing, polishing, glue squeezing and the like through the push type probe device, improves the success rate of sampling of the equipment in a drilling well, accelerates the test progress, can be repeatedly used for a long time, and reduces the overall production cost of the equipment; through the data acquisition device of sealed design for the complex environment that detection equipment can also realize carrying out the real-time transmission of data to ground in the ultra-deep drilling in pit.
Drawings
FIG. 1 is a schematic structural diagram of a probe device of a stress data testing and collecting system suitable for local wall stress relief according to an embodiment of the present invention;
FIG. 2 is an exploded view of a probe apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a data acquisition device according to an embodiment of the present invention;
FIG. 4 is an exploded view of the right hermetic seal cartridge according to the embodiment of the present invention;
FIG. 5 is an exploded view of the left hermetic seal cartridge in the embodiment of the present invention;
FIG. 6 is a diagram illustrating steps of a stress data testing and collecting method for local wall stress relief according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-upper end cover, 101-upper end cover bulge, 2-buckle cap, 3-strain gauge, 4-strain gauge lead, 5-probe push rod, 501-first annular flange, 6-spring, 7-probe base, 701-second annular flange 701, 8-circuit bin, 9-right sealed wire bin, 10-left sealed wire bin, 11-right wire holder, 12-left wire holder, 13-watertight connector, 14-right upper cover plate, 15-left upper cover plate, 16-left rear cover, 17-right rear cover, 18-strain gauge wire connector, 19-right lower cover plate and 20-left lower cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the present invention provides a stress data testing and collecting system suitable for local wall stress relief, which includes a probe device and a data collecting device. Through locating the foil gage 3 of probe unit front end, it adopts waterproof encapsulation, can expand the test in the high-temperature high-pressure liquid state environment under the deep drilling. Under the drive of a driving device at the rear end of the probe device, the probe device and the side wall stress relieving structure move towards the wall surface of the sampling section simultaneously, under specified pressure, the front end of the probe device is tightly attached to the wall surface, in the process that the stress relieving structure performs girdling relieving on a rock core, the strain gauge records the strain change condition of a stress relieving area and transmits data to the data acquisition device, the data acquisition device adopts a special sealing waterproof design, and the data acquisition circuit board can be protected to transmit data to ground equipment in a high-temperature high-pressure drilling fluid environment.
As shown in FIG. 1, the probe device comprises an upper end cover 1, a buckle cap 2, a strain gauge 3, a strain gauge lead 4, a probe push rod 5, a spring 6 and a probe base 7. The probe push rod 5 and the probe base 7 are hollow cylindrical structures, the outer diameter of the probe push rod 5 is matched with the inner diameter of the probe base 7, and one end of the probe push rod can be arranged in the probe base 7. The spring 6 is sleeved on the probe push rod 5, and two ends of the spring are respectively abutted against and fixed with the second annular flange 701 arranged on the probe base 7 and the first annular flange 501 arranged at one end of the probe push rod 5, so that the probe push rod 5 is movably connected with the probe base 7 through two ends of the spring 6. The probe base 7 can do axial reciprocating motion along the probe push rod 5 under the driving of a driving mechanism arranged at the rear end of the probe base 7. The outer ring of the first annular flange 501 at one end of the probe push rod 5 is provided with threads, and the upper end cover 1 can be fixed on the probe push rod 5 by matching with the buckle cap 2 with the threads on the inner ring. Upper end cover 1 is made for high temperature resistant corrosion resistant flexible material, and is preferred, can adopt polytetrafluoroethylene to make, and its center is equipped with one end confined cylindric upper end cover bulge 101, and upper end cover bulge 101 can pass concentric round hole and the drilling wall of a well contact that is equipped with on the buckle cap 2, exerts certain pressure, and upper end cover bulge 101 at 1 top of upper end cover can take place deformation and adapt to the irregular wall of a well to realize laminating between them. Glue is pasted through scribbling dedicated waterproof foil gage, and waterproof type foil gage 3 of high accuracy is pasted in the center department of upper end cover bulge 101 bottom, in addition, can use waterproof glue to seal upper end cover bulge 101 bottom opening part, prevents the liquid infiltration in the pit, realizes the waterproof encapsulation to foil gage 3. Preferably, the strain gauge 3 can adopt KFWS series general foil type strain gauges produced by the Japan republic of electric power company to carry out data acquisition work, has the characteristics of good waterproof performance, high precision and small error drift along with temperature, and can overcome the problem that strain measurement is distorted due to temperature drift generated by the strain gauge in the underground high-temperature environment. The strain gauge lead 4 enters the probe base 7 through the probe push rod 5 and is connected with the data acquisition device.
Under the driving of a driving mechanism, a probe base 7 pushes a spring 6 to drive a probe push rod 5 to move forwards, after an upper end cover 1 is attached to a well wall, certain pressure is continuously applied, the upper end cover 1 is always tightly attached to the well wall of a sampling section in a data sampling stage, after stress is relieved, a rock core deforms, a flexible upper end cover 1 in contact with the rock core deforms, and a strain foil 3 attached to the center position of the bottom of the upper end cover 1 can finish stress data sampling according to the deformation; after sampling is finished, the driving mechanism drives the probe base 7 to move backwards, the spring 6 returns to the original state, the probe push rod 5 releases the pressure on the upper end cover 1 to enable the upper end cover 1 to be separated from the well wall, and the probe device integrally moves backwards and is retracted into underground detection equipment to perform next testing work.
As shown in fig. 3, the data acquisition device of the embodiment of the present invention includes a circuit chamber 8 having a cylindrical structure, a cavity is provided inside the circuit chamber for fixedly mounting a circuit board, a watertight connector 13 is provided on the top of the circuit chamber 8, and the circuit board performs data transmission with a ground device through the watertight connector 13; a sealed wire cabin is arranged at one end of a cylinder of the circuit cabin 8 and is in butt joint with the strain gauge wire 4, measured stress data are transmitted to the circuit board, after circuit amplification and conversion, data signals are transmitted to a ground data processing center through a data wire in butt joint with the watertight connector 13, and data analysis in the next step is carried out. The sealed wiring bin comprises a right sealed wiring bin 9 and a left sealed wiring bin 10 which have the same structural function, are circumferentially arranged at one end of the circuit bin 8 and are fixed on the circuit bin 8 through bolts.
As shown in fig. 4, right side sealed wiring bin 9 includes right connection terminal 11, upper right cover plate 14, right back plate 17, right side down apron 19, upper right cover plate 14 and right side down apron 19 pass through bolt fixed connection and form the box body, are equipped with the cavity in the box and can hold and meet an emergency line joint 18, and box body one end is equipped with aperture accessible foil gage wire 4 and meets an emergency line joint 18 and is connected, and the other end is equipped with cylindrical cavity, its and the terminal interference fit who locates the 11 front ends of right connection terminal, fix the box body on 11 front ends of right connection terminal. Be equipped with the cavity that link up the bottom in the right wiring seat 11, circuit storehouse 8 is equipped with the same opening of cavity external diameter with the 11 laminating departments of right wiring seat, and the wire that makes and terminal connection reaches circuit storehouse 8 from cavity in the right wiring seat 11 inside, passes to the circuit board with the strain signal who gathers. The rear end of the right wire holder 11 is also provided with a right rear cover 17, a sealing ring is arranged on the end face of one end of the right rear cover 17, downhole liquid can be effectively prevented from permeating, and after the arrangement and connection of wires at the rear part of the wire holder are completed, the right rear cover 17 is assembled to complete the work of sealing the cavity part in the right wire holder 11.
As shown in fig. 5, the left sealed junction box 10 includes a left junction base 12, a left upper cover plate 15, a left rear cover 16, a strain wire connector 18, and a left lower cover plate 20.
After the wiring operation is finished, the right sealing wiring bin 9 and the left sealing wiring bin 10 inject high-temperature-resistant waterproof glue into the inner cavity part to isolate the wiring position and the butt joint connecting position from the outside, and the left rear cover 16 and the right rear cover 17 which are provided with sealing rings are used for respectively plugging the rear ends of the left wiring base 12 and the right wiring base 11, so that liquid can be effectively prevented from permeating after the assembly is finished; the circuit bin 8 adopts a sealing design, one end of the circuit bin is communicated with the outside through a watertight connector 13 which is fixedly arranged, and the circuit board is arranged in an inner cavity of the circuit bin, so that the circuit is prevented from being interfered by the underground environment.
In another embodiment, as shown in fig. 6, the downhole detection device loaded with the stress data test acquisition system comprises the following steps:
s1: the data testing and collecting system is placed to a specified depth and then centered and positioned;
s2: the probe device and the side wall stress relieving structure simultaneously move towards the wall surface of the sampling section under the action of the external driving mechanism, and the close fit between the front end of the probe device and the wall surface is realized under the specified pressure;
s3: in the process that the stress relieving structure performs girdling relieving on the rock core, the strain gauge 3 records the strain change condition of a stress relieving area and transmits data to the data acquisition device;
s4: real-time communication is realized with ground equipment to data acquisition device for underground detection equipment can also realize carrying out the real-time transmission of data to ground in the complex environment of ultra-deep drilling, realizes push type strain measurement.
In another embodiment, when the underground detection equipment loaded with the stress data test acquisition system is used for data acquisition, an upper pushing and positioning centering structure and a lower pushing and positioning structure can be adopted to perform single-synchronous radial expansion to form a fulcrum, the underground detection equipment is centered and positioned, the well wall of the sampling section is not required to be sealed and drained, the influence on the geological environment of the sampling section is small, and the local collapse of the well wall is avoided; the probe device and the side wall stress relieving structure of the stress data testing and collecting system move towards the wall surface of the sampling section at the same time, under the specified pressure, the upper end cover 1 at the front end of the probe device is tightly attached to the wall surface, the stress data testing and collecting system is suitable for various wall surface environments, the wall surface does not need to be polished, the glue injection process is also saved, the upper end cover 1 is made of flexible materials, the rock core subjected to stress relieving generates deformation and is transmitted to the stress sheet 3, the stress sheet 3 is prevented from being in direct contact with the wall of a well, rock debris and irregular hole walls are prevented from being damaged, the service life of the stress sheet 3 is greatly prolonged, the detection equipment can continuously perform testing work underground, the equipment does not need to be repeatedly lifted to the ground for replacing the stress sheet, and the efficiency of the whole testing process is improved; the high-temperature waterproof KFWS series strain gauge which is produced by the Nippon consortium is adopted by the probe device, the error range of the strain gauge coefficient caused by the temperature influence is 0.8 +/-0.5% in the range of 100 ℃, and the influence of the drilling high-temperature liquid environment on the stress data acquisition is small. Through loading the stress data test collection system, the underground detection equipment can save complex mechanisms such as packing, polishing and glue squeezing, the success rate of sampling of the equipment in a drilling well is improved, the test progress is accelerated, the underground detection equipment can be repeatedly used for a long time, and the overall production cost of the equipment is reduced. The data acquisition device protects the circuit board through the special designed sealed cabin, and the wiring position is isolated from the outside by pouring high-temperature-resistant waterproof glue on the wiring position, so that the interference of the underground complex environment on data transmission is effectively blocked, and the real-time transmission of data on the ground can be realized by the underground detection equipment in the complex environment of the ultra-deep drilling hole.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A stress data test acquisition system suitable for local wall stress relief is characterized by comprising a probe device for measuring stress in a pressing mode; the probe device comprises an upper end cover (1), a buckle cap (2), a strain gauge (3), a strain gauge lead (4), a probe push rod (5), a spring (6) and a probe base (7); one end of the probe push rod (5) is provided with a first annular flange (501), and the upper end cover (1) is buckled and fixed on the first annular flange (501) through the buckling cap (2); the upper end cover (1) is made of flexible materials, an upper end cover protruding portion (101) penetrating through the buckle cap (2) is arranged in the center of the upper end cover, and the strain gauge (3) is arranged at the bottom of the upper end cover protruding portion (101); the other end of the probe push rod (5) is sleeved in the probe base (7), and the probe base (7) can axially move along the probe push rod (5); the probe base (7) is provided with a second annular flange upper part (701); two ends of the spring (6) are respectively abutted against and fixed on the first annular flange (501) and the second annular flange (701); driven by an external driving mechanism arranged at one end of a probe base (7), the probe base (7) pushes a spring (6) to drive a probe push rod (5) to move forwards, so that an upper end cover (1) is always tightly attached to a sampling section well wall in a data sampling stage, a strain gage (3) can finish sampling of stress data according to deformation of the upper end cover (1), the sampling data passes through the probe push rod (5) and the probe base (7) through a strain gage lead (4) to be transmitted outwards, and the stress sampling data is transmitted to ground equipment through a data acquisition device; the data acquisition device comprises a sealing wiring bin connected with a strain gauge wire (4), a circuit bin (8) arranged below the sealing wiring bin and communicated with the sealing wiring bin, and a watertight joint (13) arranged at one end of the circuit bin (8), wherein the watertight joint (13) is in butt joint with a ground equipment data wire, and the ground equipment and a stress data test acquisition system realize real-time communication and press type strain measurement.
2. The stress data testing and collecting system suitable for local wall stress relief according to claim 1, wherein the sealing wire cabin comprises a right sealing wire cabin (9) and a left sealing wire cabin (10), which are circumferentially arranged on one end of the circuit cabin (8).
3. The stress data test and acquisition system suitable for local wall stress relief according to claim 2, wherein the right hermetic seal wire cabin (9) comprises a right wire holder (11), a right upper cover plate (14), a right lower cover plate (19) and a strain wire joint (18);
upper right side apron (14) and right side apron (19) fixed connection form the box body down, are equipped with the cavity in the box and can hold strain gauge joint (18), and box body one end is equipped with aperture accessible foil gage wire (4) and is connected with strain gauge joint (18), and the other end is equipped with cylindrical cavity, and it is fixed on right connection terminal (11) front end with the terminal interference fit who locates right connection terminal (11) front end.
4. The stress data test and acquisition system suitable for local wall surface stress relief is characterized in that a right back plate (17) is arranged at the rear end of the right wire holder (11), and a sealing ring is arranged on the right back plate; still be equipped with the cavity that link up the bottom in the wire holder (11) of the right side, circuit storehouse (8) and right wire holder (11) laminating department are equipped with the opening.
5. The stress data testing and collecting system suitable for local wall stress relief according to claim 2, wherein the left sealing wire cabin (10) comprises a left wire holder (12), a left upper cover plate (15), a left rear cover (16), a strain wire connector (18), a left lower cover plate (20) and a strain wire connector (18).
6. The stress data test and acquisition system suitable for local wall surface stress relief according to claim 1, wherein the stress sheet (3) is adhered to the center of the bottom of the upper end cover bulge (101) by waterproof strain sheet adhering glue, and the opening of the bottom of the upper end cover bulge (101) is sealed by waterproof glue.
7. The stress data testing and collecting system suitable for local wall surface stress relief according to claim 1, wherein the upper end cover (1) is made of polytetrafluoroethylene.
8. A stress data test and acquisition method suitable for local wall stress relief is realized by applying the stress data test and acquisition system suitable for local wall stress relief as claimed in any one of claims 1-7, and comprises the following steps:
s1: the data testing and collecting system is placed to a specified depth and then centered and positioned;
s2: the probe device and the side wall stress relieving structure simultaneously move towards the wall surface of the sampling section under the action of the external driving mechanism, and the close fit between the front end of the probe device and the wall surface is realized under the specified pressure;
s3: in the process that the stress relieving structure performs girdling relieving on the rock core, the strain gauge (3) records the strain change condition of a stress relieving area and transmits data to the data acquisition device;
s4: real-time communication is realized with ground equipment to data acquisition device for underground detection equipment can also realize carrying out the real-time transmission of data to ground in the complex environment of ultra-deep drilling, realizes push type strain measurement.
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| CN114441073A (en) * | 2022-04-07 | 2022-05-06 | 中国科学院武汉岩土力学研究所 | Small-aperture deep-hole ground stress testing system and method for water conservancy exploration drilling |
| CN114740462A (en) * | 2022-03-30 | 2022-07-12 | 中国科学院武汉岩土力学研究所 | System and method for acquiring data of deep hole wall surface stress relief drilling machine in real time |
| CN115541064A (en) * | 2022-11-24 | 2022-12-30 | 云南省交通投资建设集团有限公司 | Stress monitoring probe and method suitable for high-ground-stress tunnel chaplet surface |
| CN117309060A (en) * | 2023-10-20 | 2023-12-29 | 广东省装饰有限公司 | Building curtain wall structure performance monitoring system based on cloud computing |
| CN117629484A (en) * | 2023-11-28 | 2024-03-01 | 中国地质科学院地质力学研究所 | Force measuring device and force measuring system |
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| CN114740462A (en) * | 2022-03-30 | 2022-07-12 | 中国科学院武汉岩土力学研究所 | System and method for acquiring data of deep hole wall surface stress relief drilling machine in real time |
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| CN114441073B (en) * | 2022-04-07 | 2022-08-16 | 中国科学院武汉岩土力学研究所 | Small-aperture deep-hole ground stress testing system and method for water conservancy exploration drilling |
| CN115541064A (en) * | 2022-11-24 | 2022-12-30 | 云南省交通投资建设集团有限公司 | Stress monitoring probe and method suitable for high-ground-stress tunnel chaplet surface |
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| CN117309060B (en) * | 2023-10-20 | 2024-05-17 | 广东省装饰有限公司 | Building curtain wall structure performance monitoring system based on cloud computing |
| CN117629484A (en) * | 2023-11-28 | 2024-03-01 | 中国地质科学院地质力学研究所 | Force measuring device and force measuring system |
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