CN116411940A - Eccentric while-drilling instrument - Google Patents
Eccentric while-drilling instrument Download PDFInfo
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- CN116411940A CN116411940A CN202111680829.7A CN202111680829A CN116411940A CN 116411940 A CN116411940 A CN 116411940A CN 202111680829 A CN202111680829 A CN 202111680829A CN 116411940 A CN116411940 A CN 116411940A
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- 238000005553 drilling Methods 0.000 title claims abstract description 100
- 210000002445 nipple Anatomy 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 230000005484 gravity Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000002775 capsule Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 22
- 238000005259 measurement Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005358 geomagnetic field Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- 239000000523 sample Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B47/013—Devices specially adapted for supporting measuring instruments on drill bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The utility model discloses an eccentric while-drilling instrument, which belongs to the technical field of oil and gas exploration, and comprises: the device comprises a ground signal acquisition device, a software system, a drill string, a small-size drilling fluid transmission device, an eccentric while-drilling instrument nipple, a deflecting device and a drill bit, wherein the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric while-drilling instrument nipple, the deflecting device and the drill bit are sequentially connected, and the core device is the eccentric while-drilling instrument nipple, so that the defect that a circuit and a battery cannot be installed in a conventional water hole centering structure is overcome. The technical scheme of the utility model breaks through the design of the water hole centering of the conventional drilling instrument, solves the problem of insufficient space of a designed circuit board and a battery cabin caused by insufficient wall thickness of a short joint of a small-size instrument, realizes reasonable distribution of a plurality of circuit boards and battery cabins by designing eccentric water holes and calculating weights, and effectively solves the problems of high design difficulty, low safety coefficient and the like of the current drilling small-hole drilling instrument.
Description
Technical Field
The utility model relates to the technical field of oil and gas exploration, in particular to an eccentric while-drilling instrument, and specifically relates to a small-size eccentric while-drilling instrument.
Background
Most of oil and gas fields and oil and gas resources in China are in the middle and later stages of development, and phenomena such as well bottom junk, casing damage and the like often occur, so that normal exploitation of oil fields is affected, the exploitation and development difficulties of some special oil and gas fields are increased, and the exploitation cost is increased. Meanwhile, the size of the well bore can be gradually reduced in deep well operation, the outer diameter of a conventional while-drilling instrument is oversized, and the drilling technology of the small well bore while-drilling instrument is indispensable. The technology of slim hole drilling is utilized to realize the reuse of old wells, the recovery of accident wells and the deepening of old wells, so that more oil and gas resources can be explored, and some oil reservoirs which are considered to have no development value in the past are developed. The directional well or the horizontal well formed by sidetrack drilling or continuous deepening drilling of the slim well provides opportunities for effectively developing a new oil reservoir and entering a microcosmic unemployed oil reservoir, is an effective means for coping with the difficult problem of drilling the slim well caused by factors such as deep and complex stratum drilling accidents or complex, old well productivity attenuation or production stopping, geological target drilling disfavor and the like, can effectively avoid scrapping of drilling engineering, improves the old well utilization rate, restores the productivity of an oil field, greatly reduces the drilling cost, reduces the environmental protection pressure and effectively liberates deep oil and gas resources under the condition of complex stratum.
Presently, small wellbores having a well diameter of less than 120mm and requiring the use of unconventional tools to accomplish this are also known as ultra-small wellbores. Both slim hole directional well and horizontal well drilling of 120mm and above wellbore sizes have well-established tools and equipment, but well-established tools and processes are still immature for well-drilling sub-120 mm sizes.
Many cases of drilling small well bores and ultra-small well bores are reported at home and abroad. SlimDrill, UPAC, RP, total Exploration, amoco and other companies have successfully used casing windowing or deepening drilling in 127-139.7 mm casings in Plungar areas, texas, oklach-ma, prudhoe and other areas, so that hundreds of small-bore drilling is completed, the operation well depth is about 2000-3000 m, and the operation cost is greatly reduced compared with that of new drilling. Wherein BP company has found a new reservoir that was not considered to be of development value in the past, on the basis of a 80% reduction in single well costs in the small well bore done by Prudhoe Bay. The minimum diameter of the Beckhous small borehole-size coiled tubing bottom hole assembly is 60.3mm, and commercial applications have been developed.
The main methods for carrying out small-bore well drilling in China are old oil fields and old oil areas such as Daqing oil fields, hong Kong oil fields, liaohe oil fields, and original oil fields. The oil fields generally adopt casing windowing or section milling in a casing with the diameter of 127mm or 139.7mm, then the whipstock is separated from the old well bore, a small-diameter drill bit with the diameter of 118mm or 120mm is selected for small-bore well drilling, and the working well depth is generally about 4000 m.
The development stage is still in the country for ultra-small well directional drilling at present, and the large harbor oil field adopts a continuous oil pipe to carry out open-window sidetracking and directional drilling tests, but no substantial progress is made at present due to the limitation of the well extension capability of the continuous oil pipe and the immature nature of the directional drilling matched tools. For ultra-deep ultra-small well drilling, the ultra-small well drilling of 104mm is mainly carried out in a 127mm casing by adopting a directional windowing mode, the operation well depth is generally about 7000m, but because of the small-size MWD which can be practically used for ultra-deep well drilling and the lack of matching of a screw drilling tool, more than 40 mouths of 104mm well drilling which are cumulatively implemented since 2011 are finished by adopting a touch typing mode, and the well ratio of the obtained industrial oil gas flow is less than 50%.
Paper of domestic scholars Hou Xueli, liao Anzhi: the design and implementation of a novel underground eccentric nuclear magnetic resonance logging instrument detector describe the nuclear magnetic resonance logging instruments commercialized at home and abroad, and are mainly divided into 2 types according to underground measurement modes: down-hole centering and decentering (pushing against the borehole wall). A novel eccentric type underground nuclear magnetic resonance logging instrument magnet and an antenna are designed, a prototype is processed according to a design scheme, and echo signals are smoothly detected. But the eccentricity mainly refers to the position of the borehole where the measuring instrument is located, and is measured by being stuck to one side of the borehole wall, but not the internal structure of the instrument is eccentric.
The utility model patent CN 203515549U discloses a battery packaging device of a small-bore measurement-while-drilling instrument, which belongs to the technical field of battery packaging of small-bore measurement-while-drilling instruments. The eccentric structure is used only for battery packaging, cannot be used for mounting devices such as circuits or sensors, and is not suitable for the attention of the patent.
The utility model patent CN 106639914B describes a drilling tool with an external eccentric bit structure, mainly designed are an eccentric bit and an eccentric sleeve, and is completely different from the eccentric water hole structure of the utility model.
The utility model discloses an underground small-size directional measurement while drilling exploratory tube, which is disclosed in the patent CN 201910148272.9, and realizes the directional measurement while drilling exploratory tube with the outer diameter smaller than or equal to 35mm by utilizing the circuit, the sensor and the mechanical structure design for optimizing the space size. The directional measurement probe while drilling designed by the utility model adopts a high-precision sensor to measure the earth gravity field and the geomagnetic field, so as to determine the posture of the drilling tool and the track of the borehole. However, the directional sensor structure and the circuit framework are fixed in the middle position in the protective cylinder, so that fewer sensors and circuit boards can be placed, and the design of multiple parameters, multiple circuits and a battery compartment body cannot be realized.
Therefore, in order to solve the problems, the utility model can simulate the underground complex working condition on the ground, and independently or simultaneously realize the functions of simulating tool rotation, internal hydraulic circulation, axial load application and torque load application, so as to achieve the ground evaluation of the underground tool, and lay a good foundation for the tool to enter industrial application.
Disclosure of Invention
The utility model aims to provide an eccentric while-drilling instrument, which is used for special working conditions such as small-bore directional drilling, complex horizontal well, old well sidetracking and the like in the background technology, wherein a core device is an eccentric while-drilling instrument nipple, mainly aims at the characteristics of small diameter and thin nipple wall of the while-drilling instrument with the diameter of 85.7-120 mm, overcomes the defect that a circuit and a battery cannot be installed in a conventional water hole centering structure, adopts an eccentric water hole structural design, places a while-drilling measuring circuit and a battery cabin on one side of the instrument nipple, designs a counterweight calculation method according to a moment balance principle, and sets a wear-resisting balancing weight to prevent unbalanced moment and drilling tool shake caused by centrifugal force in the rotation process, simultaneously places a vibration sensor and a large-capacity storage chip on a circuit board in the eccentric nipple, monitors vibration data in real time, uploads partial data, and stores all monitoring vibration data for ground playback. The multi-parameter measurement function of the small-size while-drilling instrument can be realized, and the drilling efficiency is effectively improved.
Embodiments of the present utility model are implemented as follows:
an eccentric while drilling instrument, comprising: the device comprises a ground signal acquisition device, a software system, a drill string, a small-size drilling fluid transmission device, an eccentric drilling-while-drilling instrument nipple, a deflecting device and a drill bit, wherein the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are sequentially connected, the ground signal acquisition device and the software system are located above the ground, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground, and the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground.
Specifically, the short section of the eccentric while-drilling instrument adopts a water hole as an eccentric design, and a space on the left side and the right side of the short section can be used for placing a plurality of circuit boards or battery cabins, including but not limited to 3-6 cabins; the short section of the eccentric while-drilling instrument mainly comprises an external short section sleeve from outside to inside, wherein the inner wall of the short section, a battery cabin body of a circuit board, a wear-resistant balancing weight, an eccentric water hole and the like.
Further, the balancing weight is designed to realize the balance weight, and the specific calculation method is as follows:
because the upper and lower parts of the pup joint are connected with the drill string, the positions are relatively fixed, and only centrifugal force occurs due to uneven weight when the whipstock rotates, and the balance condition according to the object with a fixed rotating shaft is that the applied external torque is zero. Moment is represented by M, M U And M D Representing the moment of the upper and lower sides corresponding to the middle rotation axis, L representing the distance from the center to the axis, G representing the gravity, G U And G D Representing the mass of the upper and lower parts of the pup joint after removal of the water hole and the circuit board capsule, G C1 、G C2 、G C3 、G C4 、G C5 、G C6 (the latter two are shielded due to view angle) to show the internal mass of the cabin of the circuit board, and high-density wear-resistant balancing weights are added, and marked by P1, P2 and P3, and the corresponding gravity is G P1 、G P2 、G P3 The eccentric structure is used for compensating the gravity of the eccentric structure, reducing the thin-wall thickness abrasion at the eccentric position, realizing the replaceable abrasion-resistant belt and prolonging the service life of the eccentric nipple.
According to the relation of moment balance:
M U +M D =0, can be derived from
G D L D +G Pl L P1 +G P2 L P2 +G P3 L P3 ＝G U L U +G C1 L C1 +G C2 L C2 +…+G C6 L C6
According to g=ρvg, G is gravitational acceleration, V is volume, ρ is density, and the formula can be changed to ρ D V D L D +ρ P1 V P2 L P3 +ρ P2 V P2 L P2 +ρ P3 V P3 L P3 ＝ρ U V U L U +ρ C1 V C1 L C1 +ρ C2 V C2 L C2 +…+ρ C6 V C6 L C6 The balance weight can be calculated through the density and the volume, and balance weight balance is realized.
The embodiment of the utility model has the beneficial effects that:
the utility model provides an eccentric while-drilling instrument, which breaks through the design of the water hole centering of the conventional while-drilling instrument, solves the problem of insufficient space of a designed circuit board and a battery compartment body caused by insufficient wall thickness of a short joint of a small-size instrument, and effectively solves the problems of high design difficulty, low safety coefficient and the like of the current drilling small-hole while-drilling instrument tool by designing the eccentric water hole and calculating the balance weight to realize reasonable distribution of a plurality of circuit boards and the battery compartment body.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an eccentric while-drilling apparatus according to the present utility model;
FIG. 2 is a cross-sectional view of a nipple of an eccentric while drilling instrument;
FIG. 3 is a schematic view of the short section structure of the eccentric while-drilling instrument;
fig. 4 is a schematic diagram of calculation of the nipple weight of the eccentric while drilling instrument.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
The ultra-small borehole measurement while drilling instrument refers to a short joint of the while drilling instrument with the diameter smaller than 120mm, for example, a drill rod used by coal bed gas has the outer diameter of 85.7mm or 104.8mm (refer to API standard drill rod specification), and because the outer diameter is small and a necessary hollow overflow area of a water hole needs to be reserved, the design of a cabin body for placing a circuit board and a battery cabin body is very difficult, the current conventional design is that the water hole is in the middle of the water hole, the reduced diameter of the circuit board is placed in the middle of the water hole or uniformly distributed around the water hole, and the short joint of the instrument with the smaller diameter is not applicable. Therefore, the design of the utility model adopts the eccentric water hole structural design, and the water hole is arranged at one side of the instrument, so that more circuit cabin design space can be provided, but the main difficulties are as follows: 1. the eccentric structure can lead to unbalanced moment of the instrument nipple during rotary motion, and lead to nipple shaking under the action of centrifugal force, thereby causing potential safety hazard; 2. the density difference between the battery and the circuit board and the pup joint is large, and accurate weight calculation is needed; 3. the thinner part of the side wall of the pup joint is easy to wear, so that the service life of the pup joint is shortened. The design adopts the weight and the volume calculation of the circuit cabin body to realize the moment balance, eliminates the influence of an eccentric structure, adopts the external reinforcement wear-resistant design, prevents the abrasion of a weak structure, realizes a plurality of circuit board cabin bodies with large capacity under the condition of small size, and realizes the function of multi-parameter measurement.
Referring to fig. 1, a first embodiment of the present utility model provides an eccentric while drilling apparatus, comprising: the device comprises a ground signal acquisition device, a software system, a drill string, a small-size drilling fluid transmission device, an eccentric drilling-while-drilling instrument nipple, a deflecting device and a drill bit, wherein the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are sequentially connected, the ground signal acquisition device and the software system are located above the ground, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground, and the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground. The connection mode between each component in the system is conventional, for example, the underground components are mechanically connected, namely, conventional threaded connection, the design core is an eccentric while-drilling instrument nipple, and the rest is the prior art. Among them, software systems are also known in the art. The name of the software system is: the drill rod ground workstation system for high-speed information transmission is V1.0 version, the software has declared the copyright of the software, and the registration number is: 2020SR0784596. The software mainly comprises a tool face control, a logging curve control, a digital control and a short message control, can realize the display of tool face parameters and logging parameters, has a short message communication function with other ground devices, can be connected with an eccentric while-drilling instrument and displays collected underground data on a ground computer.
As shown in fig. 2 and 3, the nipple of the eccentric while-drilling instrument adopts a water hole as an eccentric design, and a space on the left side and the right side of the nipple can be used for placing a plurality of circuit boards or battery cabins, including but not limited to 3-6 cabins; the short section of the eccentric while-drilling instrument mainly comprises an external short section sleeve 5 from outside to inside, a short section inner wall 6, a circuit board cabin body 3, a battery cabin body 4 (not fixed and interchangeable with the circuit board), a wear-resistant balancing weight 2, an eccentric water hole 1 and the like, wherein the circuit board or the battery density is smaller than that of a short section body steel structure due to the fact that the eccentric well hole 1 is positioned on one side of a central line, the weights of the two sides of the short section are unequal, and the balancing weight is designed to realize balancing weight.
As shown in fig. 4, the specific calculation method for designing the balancing weight to realize the counterweight is as follows:
because the upper and lower parts of the pup joint are connected with the drill string, the positions are relatively fixed, and only centrifugal force occurs due to uneven weight when the whipstock rotates, and the balance condition according to the object with a fixed rotating shaft is that the applied external torque is zero. Moment is represented by M, M U And M D Representing the moment of the upper and lower sides corresponding to the middle rotation axis, L representing the distance from the center to the axis, G representing the gravity, G U And G D Indicating the mass of the upper and lower parts of the sub after removal of the water hole and the circuit board compartment, see figure 3, g C1 、G C2 、G C3 、G C4 、G C5 、G C6 (the latter two are shielded due to view angle) to show the internal mass of the cabin of the circuit board, and high-density wear-resistant balancing weights are added, and marked by P1, P2 and P3, and the corresponding gravity is G P1 、G P2 、G P3 The eccentric structure is used for compensating the gravity of the eccentric structure, reducing the thin-wall thickness abrasion at the eccentric position, realizing the replaceable abrasion-resistant belt and prolonging the service life of the eccentric nipple.
According to the relation of moment balance:
M U +M D =0, can be derived from
G D L D +G Pl L P1 +G P2 L P2 +G P3 L P3 ＝G U L u +G C1 L C1 +G C2 L C2 +…+G C6 L C6
According to g=ρvg, V is volume, ρ is density, G is gravitational acceleration, and the formula can be changed to: ρ D V D L D +ρ P1 V P2 L P3 +ρ P2 V P2 L P2 +ρ P3 V P3 L P3 ＝ρ U V U L U +ρ C1 V C1 L C1 +ρ C2 V C2 L C2 +…+ρ C6 V C6 L C6 The balance weight can be calculated through the density and the volume, and balance weight balance is realized.
It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (4)
1. An eccentric while drilling instrument, comprising: the device comprises a ground signal acquisition device, a software system, a drill string, a small-size drilling fluid transmission device, an eccentric drilling-while-drilling instrument nipple, a deflecting device and a drill bit, wherein the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are sequentially connected, the ground signal acquisition device and the software system are located above the ground, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground, and the ground signal acquisition device, the drill string, the small-size drilling fluid transmission device, the eccentric drilling-while-drilling instrument nipple, the deflecting device and the drill bit are located underground.
2. The eccentric while-drilling instrument according to claim 1, wherein the nipple of the eccentric while-drilling instrument adopts a water hole as an eccentric design, and a space on the left side and the right side of the nipple is provided with a plurality of circuit board cabins or battery cabins; the utility model provides an eccentric instrument nipple joint while drilling is from outside to inside mainly includes outside nipple joint sleeve, nipple joint inner wall, circuit board battery cabin body, wear-resisting balancing weight, eccentric water eye, and eccentric borehole is located central line one side, and circuit board or battery density are less than body steel construction, and nipple joint both sides weight is unequal, designs the balancing weight and realizes the counter weight.
3. The off-center while drilling instrument of claim 2, wherein the number of circuit board pods or battery pods is 3-6.
4. The eccentric while drilling instrument of claim 2, wherein the weight is designed to realize the weight, and the specific calculation method is as follows:
because the upper part and the lower part of the pup joint are connected with the drill string, the positions are relatively fixed, and only centrifugal force occurs due to uneven weight when the whipstock rotates, and the balancing condition according to the object with a fixed rotating shaft is that the applied external moment is zero; moment is represented by M, M U And M D Representing the moment on the upper and lower sides corresponding to the middle rotation axis, L representing the distance from the center to the axisG represents gravity, G U And G D Representing the mass of the upper and lower parts of the pup joint after removal of the water hole and the circuit board capsule, G C1 、G C2 、G C3 、G C4 、G C5 、G C6 The internal mass of the cabin body of the circuit board is represented, a high-density wear-resistant balancing weight is added, the high-density wear-resistant balancing weight is marked by P1, P2 and P3, and the corresponding gravity is G P1 、G P2 、G P3 ；
According to the relation of moment balance:
M U +M D =0, give
G D L D +G P1 L P1 +G P2 L P2 +G P3 L P3 ＝G U L U +G C1 L C1 +G C2 L C2 +…+G C6 L C6
According to g=ρvg, V is volume, ρ is density, G is gravitational acceleration, and the formula becomes: ρ D V D L D +ρ P1 V P2 L P3 +ρ P2 V P2 L P2 +ρ P3 V P3 L P3 ＝ρ U V U L U +ρ C1 V C1 L C1 +ρ C2 V C2 L C2 +…+ρ C6 V C6 L C6 The balance weight is calculated through the density and the volume, so that balance weight balance is realized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680829.7A CN116411940A (en) | 2021-12-30 | 2021-12-30 | Eccentric while-drilling instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111680829.7A CN116411940A (en) | 2021-12-30 | 2021-12-30 | Eccentric while-drilling instrument |
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| CN116411940A true CN116411940A (en) | 2023-07-11 |
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| CN202111680829.7A Pending CN116411940A (en) | 2021-12-30 | 2021-12-30 | Eccentric while-drilling instrument |
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- 2021-12-30 CN CN202111680829.7A patent/CN116411940A/en active Pending
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |