CN108361022B - Logging-while-drilling instrument shell and logging-while-drilling instrument - Google Patents
Logging-while-drilling instrument shell and logging-while-drilling instrument Download PDFInfo
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- CN108361022B CN108361022B CN201810381422.6A CN201810381422A CN108361022B CN 108361022 B CN108361022 B CN 108361022B CN 201810381422 A CN201810381422 A CN 201810381422A CN 108361022 B CN108361022 B CN 108361022B
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- 238000005553 drilling Methods 0.000 title claims abstract description 96
- 238000007789 sealing Methods 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 21
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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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
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses a logging-while-drilling instrument shell and a logging-while-drilling instrument, wherein the logging-while-drilling instrument shell comprises a shell body with conical threads, a first strain sensor, a second strain sensor, a first comparison circuit and an alarm, wherein the first strain sensor and the second strain sensor are arranged on the shell body at intervals, and are arranged adjacent to the conical threads; the distance between the first strain sensor and the conical thread is smaller than the distance between the second strain sensor and the conical thread; the first strain sensor and the second strain sensor are both connected to the input end of the first comparison circuit, and the output end of the first comparison circuit is connected with the alarm. The casing of the logging-while-drilling instrument can effectively prevent the logging-while-drilling instrument from falling off due to connection loosening, can save drilling cost and is beneficial to environment protection. The logging-while-drilling instrument with the casing can effectively save the drilling cost of the oil field and is beneficial to protecting the environment.
Description
Technical Field
The invention relates to the field of oil field logging, in particular to a logging-while-drilling instrument shell and a logging-while-drilling instrument.
Background
In the process of oil field drilling, drilling power such as bit pressure, torque and the like is provided by a power system on the ground, and is transmitted to a plurality of logging-while-drilling instruments such as a logging instrument at the bottom, a guiding instrument and the like through a drill rod with the length of thousands of meters, and finally reaches a drill bit. The multiple logging-while-drilling instruments at the bottom are connected with other instruments connected up and down through the shells of the respective instruments, particularly, conical threads are arranged on the inner surface or the outer surface of the shell of the logging-while-drilling instrument, and the logging-while-drilling instruments are locked and connected through the conical threads. However, long-distance power transmission of several kilometers is difficult to stably and smoothly perform, the physical properties of a rock stratum are variable, strong vibration can be generated in the drilling process, the conical thread connection between logging-while-drilling instruments can resist the vibration under most conditions through setting of torque, the conical thread connection can still be loosened due to long-time strong vibration, and the loosening of the connection of the logging-while-drilling instruments can occur. The logging-while-drilling instruments are easy to fall off due to long-time connection and loosening among the logging-while-drilling instruments, and once the logging-while-drilling instruments fall off and are salvaged, a large amount of manpower, material resources and time are consumed, and the salvage cost is high. And if the fishing is unsuccessful, the oil well is discarded, and the drilling is redirected, so that the drilling cost is seriously influenced. In addition, if the detached instrument has a radioactive chemical source for measuring the density, porosity and the like of the rock stratum, the surrounding environment is polluted, and the pollution of the radioactive chemical source can reach hundreds of years, so that the environmental pollution is serious.
Disclosure of Invention
The invention aims to provide a casing of a logging-while-drilling instrument, which can avoid the falling of the logging-while-drilling instrument caused by the connection loosening, save the drilling cost and avoid the environmental pollution caused by the falling of the instrument.
The invention also aims to provide a logging-while-drilling instrument so as to solve the problems of high drilling cost and environmental pollution of the traditional logging-while-drilling instrument.
In order to achieve the purpose, the invention adopts the following technical scheme:
a casing of a logging-while-drilling instrument comprises a casing with a conical thread, a first strain sensor, a second strain sensor, a first comparison circuit and an alarm, wherein the first strain sensor and the second strain sensor are arranged on the casing at intervals, and are arranged adjacent to the conical thread; the distance between the first strain sensor and the conical thread is smaller than the distance between the second strain sensor and the conical thread; the first strain sensor and the second strain sensor are both connected to the input end of the first comparison circuit, and the output end of the first comparison circuit is connected with the alarm.
In one embodiment, the casing of the logging-while-drilling instrument further includes a first switch circuit, and the first switch circuit is connected to the first comparison circuit and the alarm, respectively.
In one embodiment, the distance between the first strain sensor and the second strain sensor is less than or equal to 10 cm.
In one embodiment, the casing of the logging-while-drilling instrument further includes a resistance measurement sensor and a second comparison circuit, the resistance measurement sensor is disposed on the casing, a mud flow channel hole is disposed on the casing from the casing interface end face to the resistance measurement sensor, and the resistance measurement sensor is communicated with the outside of the casing through the mud flow channel hole; the input end of the second comparison circuit is connected with the resistance measurement sensor, and the output end of the second comparison circuit is connected with the alarm.
In one embodiment, the casing of the logging-while-drilling instrument further comprises a second switching circuit, and the second switching circuit is respectively connected with the second comparing circuit and the alarm.
In one embodiment, the casing of the logging-while-drilling instrument further includes a sealing cover, the casing is provided with a plurality of sensor mounting holes for accommodating the first strain sensor, the second strain sensor and the resistance measurement sensor, and the sealing cover is in plug-in connection with the sensor mounting holes.
In one embodiment, the casing of the logging-while-drilling tool further comprises a sealing ring, and the sealing ring is arranged between the sealing cover and the inner wall of the sensor mounting hole.
In one embodiment, the alarm is a buzzer alarm or an audible and visual alarm.
In one embodiment, the casing of the logging-while-drilling instrument further comprises an upper computer, and the upper computer is connected with the first comparison circuit and the second comparison circuit respectively.
The invention also provides a logging-while-drilling instrument which comprises the casing of any one of the logging-while-drilling instruments.
After the casing of the logging-while-drilling instrument is connected with the casings of other instruments, stress influence can be formed at the interface by torque, and the stress influence can be gradually reduced along with the loosening of the interface until the stress influence completely disappears. The casing of the logging-while-drilling instrument comprises a casing with a conical thread, a first strain sensor, a second strain sensor, a first comparison circuit and an alarm, wherein the first strain sensor and the second strain sensor are arranged close to the conical thread and used for detecting a stress strain value at the conical thread, the first comparison circuit stores stress strain initial difference values of the first strain sensor and the second strain sensor in advance, and the stress strain initial difference values are difference values of the stress strain value detected by the first strain sensor and the stress strain value detected by the second strain sensor when the casing is locked with casings of other instruments. When the casing of the logging-while-drilling instrument is connected with the casings of other instruments, the loosening occurs, the torque at the interface is reduced, the stress strain value detected by the first strain sensor and the second strain sensor is reduced, the first strain sensor is closer to the taper thread, the stress influence is greatly influenced by the change of the torque force, the second strain sensor is far away from the taper thread, the stress influence is less influenced by the change of the torque force, and therefore, the difference value between the stress strain value detected by the first strain sensor and the stress strain value detected by the second strain sensor can be increased. The first comparison circuit receives stress-strain values detected by the first strain sensor and the second strain sensor and then calculates a stress-strain difference value, the stress-strain difference value is compared with a stress-strain initial difference value, if the stress-strain difference value is larger than the stress-strain initial difference value, the casing of the logging-while-drilling instrument is connected with the casings of other instruments, the casing of the logging-while-drilling instrument is loosened, the alarm is started, alarm information is output, and a user is reminded of timely locking the casing of the instrument to connect, so that the instrument is effectively prevented from.
The casing of the logging-while-drilling instrument judges whether the casing of the logging-while-drilling instrument is connected with the casings of other instruments to be loosened or not through the stress change at the detection interface, and outputs alarm reminding to remind a user to lock the casing of the instrument in time when the loosening occurs, so that the situation that the logging-while-drilling instrument is loosened and falls off due to connection can be effectively avoided, the drilling cost can be saved, the situation that the instrument falls off to cause environmental pollution can be avoided, and the environment protection is facilitated.
The logging-while-drilling instrument with the casing can effectively ensure the connection stability of the instrument, avoid the problem that the instrument falls off due to connection loosening, save the drilling cost and be beneficial to environmental protection.
Drawings
FIG. 1 is a schematic diagram of a casing of a logging-while-drilling tool in one embodiment;
FIG. 2 is a schematic diagram of a connection structure of a casing of a logging-while-drilling tool and casings of other tools in one embodiment;
FIG. 3 is a schematic diagram of stress-affected zones at the connection interface of a LWD casing and other casing components, according to an embodiment.
In the figure:
10-casing of logging-while-drilling instrument, 20-stress influence area, 30-mandrel, 40-casing of other instrument;
101-housing, 102-first strain sensor, 103-second strain sensor, 104-first comparison circuit, 105-resistance measurement sensor, 106-second comparison circuit, 107-slurry flow channel hole, 108-sealing cover, 109-sealing ring.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The casing of the logging-while-drilling instrument comprises a casing with taper threads, the taper threads can be arranged on the inner surface of the casing and also can be arranged on the outer surface of the casing, the structural principles of the specific taper threads arranged on the inner surface of the casing and also arranged on the outer surface of the casing are the same, and for convenience of description, the taper threads are arranged on the inner surface of the casing.
Referring to fig. 1 to 3, a casing 10 of an lwd tool according to an embodiment includes a casing 101 having a tapered thread, a first strain sensor 102, a second strain sensor 103, a first comparison circuit 104, and an alarm (not shown), where the first strain sensor 102 and the second strain sensor 103 are disposed on the casing 101 at an interval, and both the first strain sensor 102 and the second strain sensor 103 are disposed adjacent to the tapered thread; wherein the distance between the first strain sensor 102 and the tapered thread is smaller than the distance between the second strain sensor 103 and the tapered thread; the first strain sensor 102 and the second strain sensor 103 are both connected to the input end of the first comparison circuit 104, and the output end of the first comparison circuit 104 is connected with an alarm.
Specifically, after the casing 10 of the logging-while-drilling tool is connected with the casings 40 of other tools, the torque can form stress influence at the interface, and the stress influence can gradually reduce until completely disappears along with the loosening of the interface. As shown in fig. 3, the torque forms a stress-affected zone 20 at the interface, and in the stress-affected zone 20, the stress-strain distribution is different from that of the adjacent area due to the influence of the torque, which is proportional to the magnitude of the torque, and gradually decreases until completely disappears as the torque decreases as the interface loosens. Therefore, the stress strain caused by the torque can be monitored to reflect the loosening condition of the interface in time.
In this embodiment, the first strain sensor 102 and the second strain sensor 103 are disposed near the tapered thread and configured to detect a stress-strain value at the tapered thread, and the first comparison circuit 104 prestores a stress-strain initial difference value between the first strain sensor 102 and the second strain sensor 103, where the stress-strain initial difference value is a difference value between a stress-strain value detected by the first strain sensor 102 and a stress-strain value detected by the second strain sensor 103 when the housing 10 is locked with the housing 40 of another instrument. When the casing 10 of the logging-while-drilling instrument is connected with the casings 40 of other instruments and loosened, the torque at the interface is reduced, the stress strain values detected by the first strain sensor 102 and the second strain sensor 103 are reduced, the first strain sensor 102 is closer to the taper thread, the stress influence is greatly influenced by the torsion change, the second strain sensor 103 is far away from the taper thread, the stress influence is less influenced by the torsion change, and therefore the difference value between the stress strain value detected by the first strain sensor 102 and the stress strain value detected by the second strain sensor 103 is increased. The first comparison circuit 104 calculates a stress-strain difference value after receiving stress-strain values detected by the first strain sensor 102 and the second strain sensor 103, compares the stress-strain difference value with the stress-strain initial difference value, if the stress-strain difference value is larger than the stress-strain initial difference value, the logging-while-drilling instrument shell 10 is connected with shells 40 of other instruments and loosens, and the alarm is started to output alarm information to remind a user of locking the instrument shells to connect in time, so that the instrument is effectively prevented from falling off.
In this embodiment, it is directly determined whether the connection between the casing 10 of the logging-while-drilling tool and the casings 40 of other tools is loose according to the difference of the stress-strain values. In other embodiments, in order to avoid false alarm, whether the connection between the casing 10 of the logging-while-drilling tool and the casings 40 of other tools is loosened can be judged according to the variation range of the difference value of the stress strain value, an alarm prompt is output when the variation range of the difference value of the stress strain value is larger than a preset variation range, and no alarm is needed when the variation range of the difference value of the stress strain value is smaller. Specifically, the first comparison circuit 104 further stores a preset difference change threshold, the first comparison circuit 104 calculates a stress-strain difference after receiving stress-strain values detected by the first strain sensor 102 and the second strain sensor 103, performs subtraction operation on the stress-strain difference and the stress-strain initial difference to obtain a difference change value, compares the difference change value with the preset difference change threshold, and if the difference change value is greater than the difference change threshold, the casing of the logging-while-drilling instrument is connected with the casings 40 of other instruments and loosened, and starts an alarm to output alarm information; if the difference change value is less than the difference change threshold, no processing is performed.
The while-drilling logging instrument shell judges whether the while-drilling logging instrument shell is connected with the shell 40 of other instruments or not through the stress change at the detection interface, and outputs alarm reminding to remind a user to lock the instrument shell in time when the shell is loosened, so that the phenomenon that the while-drilling logging instrument drops off due to loosening and connection can be effectively avoided, the drilling cost can be saved, the phenomenon that the instrument drops off to cause environmental pollution can be avoided, and the environment protection is facilitated.
In one embodiment, the first strain sensor 102 and the second strain sensor 103 are both wheatstone bridge strain gauges. Further, to ensure detection accuracy, the distance between the first strain sensor 102 and the second strain sensor 103 should be as close as possible without affecting the pressure of the instrument, and in one embodiment, the distance between the first strain sensor 102 and the second strain sensor 103 is less than or equal to 10 cm.
In one embodiment, the logging-while-drilling tool housing 10 further includes a first switch circuit, and the first switch circuit is connected to the first comparison circuit 104 and the alarm, respectively. Specifically, the first comparison circuit 104 is connected to the alarm through a first switch circuit, and the first comparison circuit 104 controls the on state of the first switch circuit to start or stop the alarm. Further, in one embodiment, the alarm is one or more of a buzzer alarm or an audible and visual alarm.
In an embodiment, the casing 10 of the logging-while-drilling instrument further includes a resistance measurement sensor 105 and a second comparison circuit 106, the resistance measurement sensor 105 is disposed on the casing 101, a mud channel hole 107 is formed on the casing 101 from an interface end surface of the casing 101 to the resistance measurement sensor 105, and the resistance measurement sensor 105 is communicated with the outside of the casing 10 through the mud channel hole 107; the input of the second comparator circuit 106 is connected to the resistance measuring sensor 105, and the output of the second comparator circuit 106 is connected to the alarm.
Specifically, the resistance measurement sensor 105 communicates with the outside of the casing 10 through the mud flow passage hole 107 for measuring the resistance of the surrounding medium. The interface of the instrument is sealed by end face metal, so if the interface is not loosened, the medium around the resistance measurement sensor 105 is air, and the resistance value is higher; once connection is loosened, mud flows in from the mud flow channel hole 107, the resistance value detected by the resistance measuring sensor 105 is reduced, the second comparison circuit 106 compares the received resistance value with the current resistance value in real time, and when the resistance value is reduced, the alarm is started to output alarm information. Generally, changes in torque are detected by the first strain sensor 102 and the second strain sensor 103 in time to allow drilling personnel to stop drilling before the interface torque is reduced to disable the face seal. However, if the first strain sensor 102 and the second strain sensor 103 are in failure or the decision of drilling personnel is wrong, whether connection loosening occurs or not can be judged by detecting the change of the peripheral cut-off resistance value through the resistance measurement sensor 105 of the embodiment, and final warning can be given before the end face sealing fails but the interface is not loosened, so that the problem that the logging-while-drilling instrument falls off due to the loosening of the interface is avoided.
In one embodiment, the logging-while-drilling tool housing further comprises a second switch circuit, and the second switch circuit is respectively connected with the second comparison circuit 106 and the alarm. Specifically, the second comparing circuit 106 is connected to the alarm device through a second switch circuit, and the second comparing circuit 106 controls the on state of the second switch circuit to start or stop the alarm device.
In an embodiment, the casing 10 of the logging-while-drilling instrument further includes a sealing cover 108, the casing 101 is provided with a plurality of sensor mounting holes for accommodating the first strain sensor 102, the second strain sensor 103 and the resistance measurement sensor 105, the sealing cover 108 is connected to the sensor mounting holes in an inserting manner, and the sealing cover 108 is inserted into the mounting holes to seal the mounting holes, so as to prevent external mud from entering the mounting holes or entering the casing 10 to corrode the sensors and the internal components of the instrument, thereby ensuring the sealing performance of the casing 10. Further, in this embodiment, the first comparing circuit 104 and the second comparing circuit 106 are both disposed on the mandrel 30 of the logging-while-drilling instrument, and in order to facilitate the detachment and installation of the first comparing circuit 104, a through hole is further formed in the housing 10, and the through hole is also sealed by a sealing cover 108. In this embodiment, the first comparing circuit 104 and the second comparing circuit 106 are mounted on the core shaft 30, in other embodiments, the first comparing circuit 104 and the second comparing circuit 106 may further have circuit board mounting holes formed in the housing 10, the first comparing circuit 104 and the second comparing circuit 106 are mounted on the housing 10, and even the first comparing circuit 104 and the second comparing circuit 106 may be disposed on the ground, which is not limited in this embodiment.
Further, to further improve the sealing performance of the connection between the mounting hole and the sealing cover 108, in one embodiment, the logging-while-drilling tool housing 10 further includes a sealing ring 109, and the sealing ring 109 is disposed between the sealing cover 108 and the inner wall of the sensor mounting hole.
In one embodiment, the logging-while-drilling tool housing 10 further includes an upper computer, and the upper computer is respectively connected to the first comparison circuit 104 and the second comparison circuit 106. Specifically, the first comparison circuit and the second comparison circuit 104 106 are further connected to an upper computer respectively, the comparison result is sent to the upper computer by the first comparison circuit and the second comparison circuit 104, the upper computer can display the comparison result in real time and display alarm information when the logging-while-drilling instrument shell 10 and other instruments are connected and loosened, and a user is further reminded of locking the instrument connection in time.
The invention also provides a logging-while-drilling instrument, which comprises the logging-while-drilling instrument shell 10 of any one embodiment. The logging-while-drilling instrument with the casing 10 can effectively ensure the connection stability of the instrument, avoid the problem of instrument falling caused by connection loosening, save the drilling cost and be beneficial to environmental protection.
It should be noted that the logging-while-drilling tool in the present embodiment is the same technical concept as the above-mentioned casing 10. Therefore, details that are not described in detail in the logging-while-drilling instrument can be referred to the casing 10 of the logging-while-drilling instrument in this embodiment, and are not described herein again.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A logging-while-drilling tool housing comprising a housing (101) having a tapered thread, characterized by further comprising: the device comprises a first strain sensor (102), a second strain sensor (103), a first comparison circuit (104) and an alarm, wherein the first strain sensor (102) and the second strain sensor (103) are arranged on the shell (101) at intervals, and the first strain sensor (102) and the second strain sensor (103) are both arranged adjacent to the tapered thread; wherein the distance between the first strain sensor (102) and the tapered thread is smaller than the distance between the second strain sensor (103) and the tapered thread; the first strain sensor (102) and the second strain sensor (103) are connected to the input end of the first comparison circuit (104), and the output end of the first comparison circuit (104) is connected with the alarm;
the first strain sensor (102) and the second strain sensor (103) are used for detecting a stress strain value at the taper thread, and the first comparison circuit (104) stores a stress strain initial difference value of the first strain sensor (102) and the second strain sensor (103) in advance; the first comparison circuit (104) receives the stress strain values detected by the first strain sensor (102) and the second strain sensor (103), calculates a stress-strain difference value, compares the stress-strain difference value with the stress-strain initial difference value, and if the stress-strain difference value is larger than the stress-strain initial difference value, starts the alarm to output alarm information; or the like, or, alternatively,
the first strain sensor (102) and the second strain sensor (103) are used for detecting a stress strain value at the taper thread, and the first comparison circuit (104) stores a stress strain initial difference value of the first strain sensor (102) and the second strain sensor (103) in advance; the first comparison circuit (104) also stores a preset difference change threshold, the first comparison circuit (104) receives stress strain values detected by the first strain sensor (102) and the second strain sensor (103), then calculates a stress strain difference, performs subtraction operation on the stress strain difference and the stress strain initial difference to obtain a difference change value, then compares the difference change value with the preset difference change threshold, and if the difference change value is larger than the difference change threshold, the alarm is started to output alarm information.
2. The logging-while-drilling instrument housing as recited in claim 1, further comprising a first switching circuit connected with the first comparing circuit (104) and the alarm, respectively.
3. The logging while drilling instrument housing of claim 1, wherein a distance between the first strain sensor (102) and the second strain sensor (103) is less than or equal to 10 cm.
4. The casing of the LWD as recited in claim 1, further comprising a resistance measurement sensor (105) and a second comparison circuit (106), wherein the resistance measurement sensor (105) is disposed on the casing (101), a mud channel hole (107) is formed in the casing (101) from an interface end face of the casing (101) to the resistance measurement sensor (105), and the resistance measurement sensor (105) is communicated with the outside of the casing (101) through the mud channel hole (107); the input end of the second comparison circuit (106) is connected with the resistance measurement sensor (105), and the output end of the second comparison circuit (106) is connected with the alarm.
5. The logging-while-drilling instrument housing as recited in claim 4, further comprising a second switching circuit, the second switching circuit being connected with the second comparing circuit (106) and the alarm, respectively.
6. The casing of the LWD tool as recited in claim 4, further comprising a sealing cover (108), wherein the casing (101) is provided with a plurality of sensor mounting holes for accommodating the first strain sensor (102), the second strain sensor (103) and the resistance measurement sensor (105), and the sealing cover (108) is connected with the sensor mounting holes in an inserting manner.
7. The logging-while-drilling instrument housing as recited in claim 6, further comprising a sealing ring (109), wherein the sealing ring (109) is disposed between the sealing cover (108) and an inner wall of the sensor mounting hole.
8. The logging-while-drilling instrument housing of claim 4, wherein the alarm is a buzzer alarm or an audible and visual alarm.
9. The logging-while-drilling instrument housing as recited in claim 4, further comprising an upper computer, wherein the upper computer is respectively connected with the first comparison circuit (104) and the second comparison circuit (106).
10. A logging-while-drilling instrument comprising the logging-while-drilling instrument housing as recited in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810381422.6A CN108361022B (en) | 2018-04-25 | 2018-04-25 | Logging-while-drilling instrument shell and logging-while-drilling instrument |
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| CN201810381422.6A CN108361022B (en) | 2018-04-25 | 2018-04-25 | Logging-while-drilling instrument shell and logging-while-drilling instrument |
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| CN108361022B true CN108361022B (en) | 2020-11-03 |
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| CN112832747B (en) * | 2020-12-24 | 2023-01-24 | 山东科技大学 | Inner-outer ring nested type pressure-torsion sensor elastomer structure and sensing element sealing method |
| CN113530468B (en) * | 2021-07-14 | 2024-03-15 | 中国海洋石油集团有限公司 | Instrument nipple joint and logging while drilling instrument |
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| US20100038135A1 (en) * | 2008-08-14 | 2010-02-18 | Baker Hughes Incorporated | System and method for evaluation of structure-born sound |
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2018
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| CN108361022A (en) | 2018-08-03 |
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