CN210264683U - Test device for measuring rock drillability - Google Patents
Test device for measuring rock drillability Download PDFInfo
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- CN210264683U CN210264683U CN201922350632.1U CN201922350632U CN210264683U CN 210264683 U CN210264683 U CN 210264683U CN 201922350632 U CN201922350632 U CN 201922350632U CN 210264683 U CN210264683 U CN 210264683U
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Abstract
The utility model discloses a test device for measuring the drillability of rocks, which comprises a frame, a driving device arranged in the frame, a rock breaking drilling pressure device and a measuring mechanism of the rock breaking drilling pressure of a micro drill bit; the rock breaking drilling and pressing device comprises a telescopic drill rod and a micro drill bit, one end of the telescopic drill rod is connected with the output end of the driving device, and the other end of the telescopic drill rod is connected with the micro drill bit; the measuring mechanism for the rock breaking and drilling pressure of the micro drill bit comprises a pressure sensor, a torque sensor and a displacement sensor, wherein the pressure sensor and the torque sensor are arranged on a telescopic drill rod, and the displacement sensor is arranged on a walking beam lifting mechanism; and the pressure sensor, the torque sensor and the displacement sensor are all electrically connected with the control system. The utility model provides a drillability of rock evaluate the technical problem of difficulty, have the modern design, easy operation is convenient, and the experiment measurement process realizes full-automatic, has greatly improved the efficiency of single experiment test, practices thrift the advantage of test time and cost.
Description
Technical Field
The utility model relates to a technical field of rock drillability is experimental, concretely relates to test device of survey rock drillability.
Background
In the prior art, in oil/gas drilling engineering, the most important is the process of breaking rock and drilling a borehole, and meanwhile, the basic properties of stratum rock are objective factors influencing the rock breaking efficiency. With the rapid development of drilling technology and its theory, it has been found that the drillability of rock is very complex, and it is not accurate to evaluate the drillability of rock directly from some physical property of rock. The accuracy of understanding rock properties determines the rationality of the actual drilling process, the drillability of the rock is closely related to the drilling technology, the drillability of the rock is measured, and accurate and real data can be obtained only by performing drilling and breaking on the actual rock. Therefore, the physical and mechanical properties and the rock breaking rule of the rock are fully researched; and secondly, accurately predicting the lithology of the stratum.
The concept of rock drillability was first proposed by Tillson at 1927 at the university of columbia mining engineering conference, usa, and refers to how easily rock is drilled by a rock breaking tool under certain technical conditions. And the characterization of the drillability of rock by using the drilling index of the micro-drill bit is a very direct method. The rock taken out from the actual drilling stratum is subjected to simulated drilling experiments through indoor experimental equipment and a testing tool, and the comprehensive index of a certain drilling condition and technology is reflected by the micro drilling speed when the drilling tool breaks the rock. The micro-drilling method can truly reflect the drillability range of the stratum to be drilled, provides powerful parameters for the selection of the drill bit, the geological stratification and the like, and is a reliable basis for verifying the accuracy of other drillability evaluation methods. At present, the oil and gas industry Standard of the people's republic of China (SY/T5426-2016) specifies a rock drillability determination and classification method, but physical and mechanical properties and rock breaking rules of rocks and the guidance of the selection of a drill bit by predicting the lithology of strata are not deeply disclosed, and the problems are the key problems to be solved urgently in the current drilling engineering.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a test device of survey rock drillability to solve the technical problem of the drillability evaluation difficulty of rock among the prior art.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a test device for measuring the drillability of rock comprises a frame, a driving device arranged in the frame, a rock breaking bit pressure device and a measuring mechanism of the rock breaking bit pressure of a micro drill bit;
the rock breaking drilling and pressing device comprises a telescopic drill rod and a micro drill bit, one end of the telescopic drill rod is connected with the output end of the driving device, and the other end of the telescopic drill rod is connected with the micro drill bit;
the measuring mechanism for the rock breaking and drilling pressure of the micro drill bit comprises a pressure sensor, a torque sensor and a displacement sensor, wherein the pressure sensor and the torque sensor are arranged on a telescopic drill rod, and the displacement sensor is arranged on a walking beam lifting mechanism; and the pressure sensor, the torque sensor and the displacement sensor are all electrically connected with the control system.
Optionally or preferably, the driving device is a variable speed motor which is operated by a control program in the control system and outputs data for control.
Optionally or preferably, a brake is further arranged on the output shaft of the speed regulating motor.
Optionally or preferably, two ends of the walking beam lifting mechanism are respectively connected with the inner rail of the stand column of the rack by using gears.
Optionally or preferably, a jacket is arranged inside the upper end of the frame, and a jacket fixing end of the jacket is fixed at the top of the frame.
Optionally or preferably, a material receiving disc is arranged below the micro drill on the telescopic drill rod.
Optionally or preferably, a displacement limiter for limiting the walking beam lifting mechanism is arranged on one side of the stand column of the rack.
Alternatively or preferably, the micro drill bit comprises a roller cone bit and a PDC bit; the lower end of the roller bit main body is provided with a bolt type joint I convenient to replace, the middle part of a left fixed pressing plate at the upper end is provided with a shaft, a plurality of groups of blades are arranged in the shaft, a plurality of supporting gaskets for supporting loads of the plurality of groups of blades are arranged between the rollers, a detachable pressing plate for fixing the blades is arranged on the right side, the middle part of the roller bit main body is provided with a screw hole I, and a screw rod I for fixing the detachable pressing plate is arranged on the screw hole I; the PDC drill bit is characterized in that a bolt type connector II convenient to replace is arranged at the lower end of the PDC drill bit main body, a screw hole II, a pressing plate and a composite PDC sheet are arranged at the upper end of the PDC drill bit main body, a screw rod II fixed to the pressing plate is installed on the screw hole II, and the composite PDC sheet is fixed to the pressing plate.
Based on the technical scheme, the embodiment of the utility model provides a can produce following technological effect at least:
the utility model provides a flexible drilling rod is connected at buncher to the drive microbit is rotatory. The walking beam lifting mechanism drives the telescopic drill rod to ascend and keep a certain load, so that the micro drill bit is driven to move upwards and press the rock, and the rock is crushed. The rock core is 50mm in diameter, 70 mm's cylinder of height, and is fixed through the screw rod of clamp cover both sides, and the clamp cover stiff end is fixed in the frame top, through the screw rod with rock centre gripping. The micro-drill bit is placed under the jacket in an inverted mode, meanwhile, the receiving disc is arranged, broken rock scraps are separated and collected through gravity, the condition of repeated breaking is formed, and the safety and the cleanness of the instrument are guaranteed. The method comprises the steps of testing and using a micro drill bit through a displacement sensor, a pressure sensor and a torque sensor on a micro drill test bed, obtaining the influence relation of the drilling rate of the rock, the drilling rate and the rotating speed under the condition of single factor by changing different drilling pressures and rotating speeds, and obtaining the mechanical drilling rate of the rock by randomly combining and converting the drilling pressures and the rotating speeds. The utility model relates to a novelty, easy operation is convenient, and the experiment measurement process realizes full-automatic, through the function of deep-drilling single experiment test multiunit rock drillability value, has greatly improved the efficiency of single experiment test, practices thrift experimental time and cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the main body of the present invention;
FIG. 2 is a schematic structural view of a roller cone drill bit according to the present invention;
FIG. 3 is a schematic structural view of a PDC drill bit according to the present invention;
FIG. 4 is a graph of experimental data of rock drillability of the roller cone micro bit with different weight on bit during the experiment of the present invention;
FIG. 5 is a comparative graph of bottom dressing drillability curves before and after treatment in the experimental process of the present invention;
FIG. 6 is a graph of the weight per unit diameter and unit area of the drill bit in the experiment process of the present invention;
FIG. 7 is a graph comparing the drilling rate of the experimental test and the theoretical calculation in the experimental process of the present invention;
fig. 8 is a comparative graph of drillability level values of experimental tests and theoretical calculations in the experimental process of the present invention.
In the figure: 1-a frame; 2-a torque sensor; 3-a pressure sensor; 4-telescoping drill pipes; 5-a beam-lifting mechanism; 6-receiving plate; 7-a micro drill bit; 8-jacket; 9-jacket fixed end; 10-speed regulating motor; 11-a brake; 12-a displacement limiter; 13-core; 16-bolt type joint one; 17-roller cone drill bits; 18-screw rod one; 19-a removable platen; 20-a support pad; 21-a blade; 22-a platen; 23-screw eye two; 24-composite PDC chips; 25-a displacement sensor; 26-PDC bits; 27-bolt type joint two.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A test device for measuring the drillability of rock comprises a frame 1, a driving device arranged in the frame 1, a rock breaking bit pressure device and a measuring mechanism of the rock breaking bit pressure of a micro drill bit;
the rock breaking drilling and pressing device comprises a telescopic drill rod 4 and a micro drill bit 7, one end of the telescopic drill rod 4 is connected with the output end of the driving device, and the other end of the telescopic drill rod is connected with the micro drill bit 7;
the measuring mechanism for the rock breaking and drilling pressure of the micro drill bit comprises a pressure sensor 3, a torque sensor 2 and a displacement sensor 25, wherein the pressure sensor 3 and the torque sensor 2 are arranged on a telescopic drill rod 4, and the displacement sensor 25 is arranged on a walking beam lifting mechanism 5; the pressure sensor 3, the torque sensor 2 and the displacement sensor 25 are all electrically connected with a control system; the control system is a computer, and the pressure sensor 3, the torque sensor 2 and the displacement sensor 25 are all connected with a dynamic control card in a computer host, run by a control program and output data.
As an alternative embodiment, the driving device is an adjustable speed motor 10 which is operated by a control program in the computer and outputs data for control.
As an alternative embodiment, a brake 11 is further disposed on the output shaft of the adjustable speed motor 10.
As an alternative embodiment, two ends of the walking beam lifting mechanism 5 are respectively connected with the inner rails of the stand column of the rack 1 by using gears.
As an alternative embodiment, a jacket 8 is arranged inside the upper end of the frame 1, and a jacket fixing end 9 of the jacket 8 is fixed on the top of the frame.
As an optional implementation mode, a receiving disc 6 is arranged below a micro drill 7 on the telescopic drill rod 4, so that the crushed rock scraps are separated and collected through gravity, the repeated crushing condition is formed, and the safety and the cleanness of the instrument are ensured.
As an alternative embodiment, a displacement limiter 12 for limiting the walking beam lifting mechanism 5 is arranged on one side of the upright post of the frame 1.
In an alternative embodiment, the micro drill bit 7 comprises a roller cone bit 17 and a PDC bit 26; a first bolt type connector 16 convenient to replace is arranged at the lower end of a main body of the roller bit 17, a shaft is arranged in the middle of a left fixed pressing plate at the upper end, 8 groups of blades 21 are arranged in the shaft, 7 supporting gaskets 20 for supporting the load of the 8 groups of blades 21 are arranged between the rollers, a detachable pressing plate 19 for fixing the blades 21 is arranged on the right side, a first screw hole is arranged in the middle of the main body of the roller bit 17, and a first screw 18 for fixing the detachable pressing plate 19 is arranged on the first screw hole; the lower end of the main body of the PDC drill bit 26 is provided with a bolt type joint II 27 convenient to replace, the upper end of the main body is provided with a screw hole II 23, a pressing plate 22 and a composite PDC sheet 24, the screw hole II 23 is provided with a screw rod II fixed on the pressing plate 22, and the pressing plate 22 fixes the composite PDC sheet 24.
The working process of the utility model is as follows:
s1: bit pressure and rotation speed experiment under single-factor condition
S11: firstly, opening the jacket 8, putting the core 13 in, screwing a screw rod on, starting the speed regulating motor 10, starting the rotating speed control system to control the rotating speed, finally starting the walking beam lifting mechanism and the displacement sensor 25, and starting the bit pressure control system to control the bit pressure. (bit weight was fixed and varied when carrying out the bit weight test; bit weight was fixed and varied when carrying out the rotational speed test)
S12: and real-time drilling depth, drilling pressure and torque parameters of the rock 13 are obtained through the displacement sensor 25, the pressure sensor 3 and the torque sensor 2.
S13: and after the experiment is finished, the speed regulating motor 10 is stopped, the walking beam lifting mechanism 5 and the displacement sensor 25 are adjusted downwards, and instruments of all parts are closed.
For example, bit-weight tests were performed on sandstone using a roller cone drill bit. The rock drillability test of the improved roller cone micro bit is carried out by sandstone, each test point is fixed at the rotating speed of 55rpm and is sequentially tested according to the bit pressures of 850N, 800N, 750N, 700N, 600N and 510N, and the experimental result is shown in figure 4:
as can be seen from FIG. 4, the slope of the rock drillability curve increases significantly with increasing weight-on-bit, indicating that changes in weight-on-bit have a significant effect on the rate of penetration and thus on the drillability of the rock. In addition, there are significant periodic fluctuations in the drillability curves of the roller cone micro-bit at different weight-on-bit in FIG. 4. Therefore, the original data is processed by a moving average method to smooth the drillability curve of the rock, and the weights of the elements in each window of the periodic fluctuation are considered to be equal, i.e. the experimental original data is preprocessed by a simple moving average method. And (3) obtaining the drillability level value and the drilling speed of the rock under the corresponding drilling pressure when the drill bit corresponding to the effective drilling depth of 2.4mm (namely the drilling depth of 0.2 mm-2.6 mm) is taken from the processed experimental data, and the value and the drilling speed are shown in the table 1.
TABLE 1 table of drillability level values and drilling rates for different weight on bit rocks
S2: drillability test
S21: firstly, opening the jacket 8, putting the core 13 in, screwing a screw rod on, starting the speed regulating motor 10, starting the rotating speed control system, finally starting the walking beam lifting mechanism 5 and the displacement sensor 25, and starting the bit pressure control system. And drilling is carried out through a compiled program of a computer, and the drilling time is measured. (rotation speed 55 r/min; weight on bit: roller cone 890N, PDC 500N)
S22: and real-time drilling depth, drilling pressure and torque parameters of the rock 13 are obtained through the displacement sensor 25, the pressure sensor 3 and the torque sensor 2.
S23: and after the experiment is finished, storing data and closing the program, stopping the speed regulating motor 10, adjusting the walking beam lifting mechanism and the displacement sensor 25 downwards, and closing all the instruments.
For example, bit-weight tests were performed on sandstone using a roller cone drill bit. The diameter (or area) of a bottom broken pit formed by the roller cone micro-bit in the process of drilling the core is gradually increased until a maximum broken pit is formed when the drilling depth is 16mm, and the drilling process is called a bottom rock repairing drillability experiment. And carrying out a drilling performance test of the modified roller bit ground rock by using the sandstone rock sample. In the experiment process, the bit pressure is fixed to be 890N, the rotating speed is 55rpm, the one-time drilling depth is 16mm, the drill bit and the rock sample crushing pit after the experiment are obtained, and the experiment result is shown in figure 5.
Similar to the rock drillability experiment of the improved roller cone micro bit under different drilling pressures, the curve of the rock drillability of the base rock repaired by the roller cone micro bit also has periodic fluctuation, and the original data can be processed by adopting a simple moving average method. According to the calculation method of the simple moving average method, the raw data of the drillability curve is processed by respectively taking n to be 5, 10, 15, 20 and 25 … …. When the final determination is that n is 25, the distortion degree of the original data is reduced as much as possible while the processed curve is stable and smooth. The bottom dressing drillability curves before and after treatment are shown in figure 5:
programmed calculation, weight on bit is found to be 890N for any depth of hole, per unit diameter and per unit area, as shown in fig. 6. The weight on bit is respectively calculated to be 850N, 800N, 750N, 700N, 600N and 510N, the weight on bit per unit diameter and unit area at the drilling depth of 2.6mm is obtained, and points equal to the weight on bit are found in the figure 6, so that corresponding drilling depth points are obtained. Finding out the corresponding drilling time point on the curve processed in fig. 5 according to the drilling depth point, finally, taking the drilling depth point as the starting point to intercept the effective drilling depth of 2.4mm upwards, and obtaining the corresponding drilling time, respectively calculating the drilling speed and drillability level values on each unit area and unit diameter drilling pressure, as shown in table 2.
TABLE 2 drilling rate and drillability level values calculated by unit area and unit diameter pressure
Combining the data in table 1 and table 2, a measured result of different weight-on-bit drillability and a drilling speed comparison graph (fig. 7) and a drillability value comparison graph (fig. 8) based on the calculated results of the unit area and the weight-on-bit on the unit diameter are obtained.
As can be seen from FIG. 7, the measured drilling rate exhibits a better linear growth relationship with the increase of the weight-on-bit; the drilling rate and the drilling pressure respectively obtained based on the drilling pressure on the unit area and the unit diameter have good linear growth relation. Comparing the three results, the drilling speed calculated by the weight on bit per unit diameter is closer to the actual measurement value.
As can be seen from FIG. 8, the actually measured drillability value shows a better linear growth relationship with the decrease of the weight on bit; the drillability level values respectively obtained based on the bit pressure on the unit area and the unit diameter have better linear growth relation with the bit pressure. Comparing the three results, the drillability level calculated based on the weight on bit per unit diameter is closer to the actual value.
Generally speaking, the drilling speed calculated based on the unit diameter bit pressure and the rock drillability have better goodness of fit with the measured value, and are closer to the experimental value. It is stated that specific weight on bit affects rate of penetration per unit diameter. Further, the comprehensive influence of multiple drilling parameters (drilling pressure, rotation speed and liquid column pressure) on the drilling rate needs to be researched to establish a drilling rate equation model so as to quantify the comprehensive influence of each parameter on the drilling rate.
S3: experiment of drilling rate
S31: firstly, opening the jacket 8, putting the core 13 in, screwing a screw rod on, starting the speed regulating motor 10, starting the rotating speed control system, finally starting the walking beam lifting mechanism and the displacement sensor 25, and starting the bit pressure control system. The random drilling of the bit pressure and the rotating speed is realized by a computer compiled program automatic control system.
S32: and real-time drilling depth, drilling pressure and torque parameters of the rock 13 are obtained through the displacement sensor 25, the pressure sensor 3 and the torque sensor 2.
S33: and after the experiment is finished, storing data and closing the program, stopping the speed regulating motor 10, adjusting the walking beam lifting mechanism and the displacement sensor 25 downwards, and closing all the instruments.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A test device for determining the drillability of rock, characterized in that: the device comprises a rack (1), a driving device arranged in the rack (1), a rock breaking drilling pressure device and a measuring mechanism of the rock breaking drilling pressure of a micro drill bit;
the rock breaking and drilling pressure device comprises a telescopic drill rod (4) and a micro drill bit (7), one end of the telescopic drill rod (4) is connected with the output end of the driving device, and the other end of the telescopic drill rod is connected with the micro drill bit (7);
the measuring mechanism for the rock breaking and drilling pressure of the micro drill bit comprises a pressure sensor (3) arranged on the telescopic drill rod (4), a torque sensor (2) and a displacement sensor (25) arranged on the walking beam lifting mechanism (5); and the pressure sensor (3), the torque sensor (2) and the displacement sensor (25) are all electrically connected with a control system.
2. A test device for determining the drillability of rock according to claim 1, further comprising: the driving device is a speed regulating motor (10) which is operated by a control program in the control system and outputs data for control.
3. A test device for determining the drillability of rock according to claim 2, further comprising: and a brake (11) is also arranged on the output shaft of the speed regulating motor (10).
4. A test device for determining the drillability of rock according to claim 1, further comprising: two ends of the beam lifting mechanism (5) are respectively connected with the inner rails of the stand columns of the rack (1) through gears.
5. A test device for determining the drillability of rock according to claim 1, further comprising: the clamping device is characterized in that a clamping sleeve (8) is arranged inside the upper end of the rack (1), and a clamping sleeve fixing end (9) of the clamping sleeve (8) is fixed to the top of the rack.
6. A test device for determining the drillability of rock according to claim 1, further comprising: and a take-up (6) is arranged below the micro drill bit (7) on the telescopic drill rod (4).
7. A test device for determining the drillability of rock according to claim 1, further comprising: and one side of the stand column of the rack (1) is provided with a displacement limiter (12) for limiting the walking beam lifting mechanism (5).
8. A test device for determining the drillability of rock according to claim 1, further comprising: the micro drill bit (7) comprises a roller cone drill bit (17) and a PDC drill bit (26); a first bolt type joint (16) convenient to replace is arranged at the lower end of a main body of the roller bit (17), a shaft is arranged in the middle of a left fixed pressing plate at the upper end, a plurality of groups of blades (21) are arranged in the shaft, a plurality of supporting gaskets (20) for supporting the loads of the plurality of groups of blades (21) are arranged among the rollers, a detachable pressing plate (19) for fixing the blades (21) is arranged on the right side of the main body of the roller bit (17), a first screw hole is arranged in the middle of the main body of the roller bit (17), and a first screw (18) for fixing the detachable pressing plate (; PDC drill bit (26) main part lower extreme is equipped with the bolt formula that makes things convenient for the change and connects two (27), and the upper end is equipped with screw rod eye two (23), clamp plate (22) and compound PDC piece (24), install screw rod two fixed to clamp plate (22) on screw rod eye two (23), compound PDC piece (24) are fixed in clamp plate (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922350632.1U CN210264683U (en) | 2019-12-24 | 2019-12-24 | Test device for measuring rock drillability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922350632.1U CN210264683U (en) | 2019-12-24 | 2019-12-24 | Test device for measuring rock drillability |
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| Publication Number | Publication Date |
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| CN210264683U true CN210264683U (en) | 2020-04-07 |
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| CN201922350632.1U Expired - Fee Related CN210264683U (en) | 2019-12-24 | 2019-12-24 | Test device for measuring rock drillability |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113187406A (en) * | 2021-05-27 | 2021-07-30 | 西南石油大学 | Miniature roller bit suitable for indoor micro-drilling test in oil and gas drilling industry |
| CN113252467A (en) * | 2021-06-07 | 2021-08-13 | 西南石油大学 | Rock drilling experimental device and method for simulating true triaxial condition of deep well drilling |
| CN113310829A (en) * | 2021-04-14 | 2021-08-27 | 西南石油大学 | Device and experimental method for testing drillability of rock in impact mode |
| CN114184502A (en) * | 2022-02-15 | 2022-03-15 | 西南石油大学 | PDC micro-drill bit, rock drillability testing device and method |
| CN114412400A (en) * | 2022-01-29 | 2022-04-29 | 吉林大学 | Device and method for simulating mechanical coring drilling process of ice layer |
| CN117571489A (en) * | 2024-01-12 | 2024-02-20 | 东北大学 | Rock drillability evaluation test device under true three-dimensional high stress state |
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2019
- 2019-12-24 CN CN201922350632.1U patent/CN210264683U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310829A (en) * | 2021-04-14 | 2021-08-27 | 西南石油大学 | Device and experimental method for testing drillability of rock in impact mode |
| CN113310829B (en) * | 2021-04-14 | 2022-10-25 | 西南石油大学 | Drillability testing device and experimental method for rock in impact mode |
| CN113187406A (en) * | 2021-05-27 | 2021-07-30 | 西南石油大学 | Miniature roller bit suitable for indoor micro-drilling test in oil and gas drilling industry |
| CN113187406B (en) * | 2021-05-27 | 2022-05-20 | 西南石油大学 | Miniature roller bit suitable for indoor micro-drilling test in oil and gas drilling industry |
| CN113252467A (en) * | 2021-06-07 | 2021-08-13 | 西南石油大学 | Rock drilling experimental device and method for simulating true triaxial condition of deep well drilling |
| CN113252467B (en) * | 2021-06-07 | 2022-04-15 | 西南石油大学 | Rock drilling experimental device and method for simulating true triaxial condition of deep well drilling |
| US11566986B2 (en) | 2021-06-07 | 2023-01-31 | Southwest Petroleum University | Rock drilling experimental device and method for simulating true triaxial conditions of deep well drilling |
| CN114412400A (en) * | 2022-01-29 | 2022-04-29 | 吉林大学 | Device and method for simulating mechanical coring drilling process of ice layer |
| CN114184502A (en) * | 2022-02-15 | 2022-03-15 | 西南石油大学 | PDC micro-drill bit, rock drillability testing device and method |
| CN117571489A (en) * | 2024-01-12 | 2024-02-20 | 东北大学 | Rock drillability evaluation test device under true three-dimensional high stress state |
| CN117571489B (en) * | 2024-01-12 | 2024-03-22 | 东北大学 | Rock drillability evaluation test device under true three-dimensional high stress state |
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Granted publication date: 20200407 Termination date: 20211224 |