CN108917704A - Based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method - Google Patents
Based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method Download PDFInfo
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- CN108917704A CN108917704A CN201810902299.8A CN201810902299A CN108917704A CN 108917704 A CN108917704 A CN 108917704A CN 201810902299 A CN201810902299 A CN 201810902299A CN 108917704 A CN108917704 A CN 108917704A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
- G01C3/20—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument with adaptation to the measurement of the height of an object
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The present invention relates to one kind to be based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method, including being fixed at all dip measuring devices on hull at equal intervals along the hull direction of observation vessel, and all dip measuring devices are arranged along the height such as same straight line；The race glass of all dip measuring devices is horizontal positioned, it is directed at blowout fluid low dot location simultaneously, the high point surveillance mirror alignment blowout fluid high point position for adjusting all dip measuring devices, so that blowout fluid high point position level is passed to corresponding race glass；The hull status information of inclination angle and observation vessel is observed based on each observation point, calculates blowout fluid liquid-column height.The present invention will be difficult to liquid-column height measured directly and be converted into three inclination angle measurements, this process need to only measure blowout fluid column high point angle, be not required to measure platform actual range, reduce and measure to laser pulse instrument apart from bring environmental error because of severe sea condition.
Description
Technical field
The present invention relates to one kind to be based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method, is related to sea
Foreign petroleum and natural gas well drilling applications.
Background technique
World ocean petroleum resources rich reserves, account for the 34% of global oil total resources.As exploratory engineering of off-shore petroleum/gas reservoir is opened
The development of hair technology, marine oil and gas yield grow steadily, it has also become the new growth source of world's oil and gas production, but offshore drilling
Exploitation petroleum resources are typical high repayment, high-risk investment project, once blowout out of control accident occurs for drilling platforms, it will it makes
At huge economic loss, casualties and ecocatastrophe, such as the deep water horizon of U.S. Mexico gulf in 2010 drilling platforms
Blowout out of control explosion accident lasts 87 days and rescues successfully, 9.3 hundred million dollars of direct economic loss, cause 160 kilometers of seashore by
Leak the pollution of crude oil.
When strata pressure forecasting inaccuracy, drilling fluid density are relatively low, drilling fluid in well caused by the reasons such as human operational error
When pressure is lower than strata pressure, gas stream will be poured in the wellbore of probing, when the amount of pouring in is larger, that is, blowout.When blowout can not
Effectively control further deteriorates when leading to blowout out of control, will result in drilling platforms and the disasters accident such as catches fire, explode, generation blowout
Accident will cause environmental pollution and heavy economic losses.Due to the particularity of Marine oil and gas resource, prediction of formation pressure accuracy rate
Lower, the probability that blowout occurs in drilling process is higher, and in blowout early period of origination, effectively control blowout is that Prevention of blowout loses rapidly
The most effective means of control accident, blowout need to close preventer and read the parameters such as Standpipe pressure during closing well, casing pressure shut-in, sentence again after occurring
Disconnected strata pressure, and when preventer failure or the well head spray larger personnel of gesture can not be close to well heads, these parameters cannot be effective
It obtains.At this point it is possible to by indirect method estimate strata pressure, blowout fluid jet height be it is reliable, valuable shows
One of field parameters can be provided technology for subsequent kill-job operation and be protected by blowout fluid jet height Inversion Calculation strata pressure
Barrier.When blowout occur simultaneously again can not effective closing well when, drilling platforms personnel need to withdraw platform, reach home, blowout
Fluid level cannot be measured directly, can only remote observation on salvor or on surveying vessel, in this case, telemeasurement
Blowout fluid liquid-column height can use following several method：
1, laser electrical measuring method
On salvor, distance L between salvor and ocean platform is measured using laser pulse ranging instrument.Utilize theodolite
Measure blowout fluid high point inclination alpha.Blowout fluid level H=Lsin α can be calculated according to triangle Pythagorean theorem.But this
The use of kind laser pulse ranging instrument has very big limitation, and testee needs energy strong reflection photoelectric pulse signal, that is to say, that
This instrument can only Measuring Oceanic platform structure body, cannot directly measure blowout fluid column.If sea wind is strong, fluid column deviates flat
Platform will lead to measurement result distortion；The strong ocean platform of blowout is lost, then the method just fails.
2, barometry
Gas-pressure survey meter is carried using unmanned plane, blowout fluid column high point atmospheric pressure value and sea-level pressure value is measured, utilizes gas
Pressure difference calculates blowout liquid-column height.There are many drawbacks in this method, unmanned plane first can not accurately hang in use
It is stopped at blowout fluid column high point position, high point atmospheric pressure value is measured inaccurate；Secondly blowout location circumstances are complicated severe, to unmanned plane
It injures huge, causes huge economic losses, so method is not applicable with blowout elevation carrection.
3, picture pixels method
On salvor, blowout fluid column can be shot using high-precision video camera by unmanned plane, be fixed
Camera shoots the vanishing point information and characteristic body parameter in picture, carries out the excellent solution of parameter using genetic algorithm, and height can be completed and survey
Amount.But this measurement method requires picture to possess high pixel, is influenced by distance and marine climate environment, machine operation
When, jolts serious, and picture discrimination degree is low, it cannot be guaranteed that measurement accuracy, error is larger.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide one kind for accurately measuring blowout liquid-column height, solution blowout
When accident bottom pressure measuring and calculating problem based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method.
To achieve the above object, the present invention takes following technical scheme：One kind being based on the offshore drilling blowout of hull freedom degree
Fluid liquid-column height measurement method, including the following contents：
All measuring devices are fixed on hull at equal intervals along the hull direction of observation vessel, and all inclination angles measure
Device is arranged along the height such as same straight line；
The race glass of all dip measuring devices is horizontal positioned, while it being directed at blowout fluid low dot location, it adjusts
The high point surveillance mirror alignment blowout fluid high point position for saving all dip measuring devices, so that blowout fluid high point position level passes
Enter corresponding race glass；
The hull status information of inclination angle and observation vessel is observed based on each observation point, calculates blowout fluid liquid-column height.
Further, which is characterized in that when dip measuring device is set as three, blowout fluid liquid-column height HAlwaysFor：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height
Degree, 3 observation point observation inclination values are respectively α from observation vessel1, α2, α3；
If rolling, roll angle θ occur for hull1, blowout liquid-column height HAlwaysFor：
If trim, trim angle θ occur for hull2, blowout liquid-column height HAlwaysFor：
Further, if gas blowout accident point is on the extended line of three observation point lines, blowout liquid-column height HAlwaysFor
HTotal 1、HTotal 2Or HTotal 3One of：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height
Degree, 3 observation point observation inclination values are respectively α from observation vessel1, α2, α3。
Further, if hull course be in using gas blowout accident point as the center of circle, between distance be radius tangent to periphery on,
Blowout liquid-column height H is obtained by intermediate sight point and any one observation point measurement angle data of edgeAlwaysFor：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height
The observation point observation inclination value of degree, edge is α1, it is α that intermediate sight point, which observes inclination value,2。
Further, a blowout fluid liquid-column height measuring device, the blowout fluid liquid-column height measurement are additionally provided with
Device includes at least three dip measuring devices, signal condition and pretreatment unit, data acquisition unit and computer,
In, the angle measurement that each dip measuring device is used to will acquire is sent to the signal condition and pretreatment unit,
The signal condition and pretreatment unit are sent out after being handled received angle measurement by data acquisition acquisition unit
It is sent to the computer and blowout fluid liquid-column height is calculated.
Further, each dip measuring device further includes bracket, lever arm, angle measuring sensor and fixation
Mirror；The structure stand back side is flexibly connected the lever arm, and the high point surveillance mirror, institute is fixedly installed in the lever arm top
State the angle measuring sensor being additionally provided on lever arm for measuring observation point observation inclination angle；The structure stand upper end
It is provided with the through-hole for accommodating the high point surveillance mirror；The index glass, the structure branch is arranged in activity on the structure stand
Race glass and fixed mirror are further fixedly arranged on frame, and the race glass and fixed mirror are located at same level straight line；
Wherein, the fixed mirror can by the blowout fluid fluid column highest point level successively reflected through the high point surveillance mirror and index glass into
Enter the race glass.
Further, the bottom of the structure stand and lever arm is disposed as arc, and the bottom of the lever arm with
The bottom of the structure stand is tangent, and the lever arm bottom, which is extended forward, prevents the lever arm and the structure branch
The arc-shaped limit block that frame sways forwards and backwards.
Further, the index glass increases the convex lens shown using optically focused focusing is played, and the fixed mirror is using semi-transparent
Half anti-plane mirror.
Further, the amplification factor of the race glass is 10~60 times, and length is the structure stand height
1/2, lens barrel eyepiece diameter is the 1/8 of the structure stand height.
Further, it is provided on the lever arm for by rotating the screw being fixed with the structure stand.
The invention adopts the above technical scheme, which has the following advantages：1, the present invention will be difficult to liquid measured directly
Pillar height degree is converted into inclination angle measurement, by the way that offshore drilling liquid-column height can be obtained using trigonometric function relevant knowledge, this process
Blowout fluid column high point angle only need to be measured, is not required to measure platform actual range, reduces and is surveyed because of severe sea condition to laser pulse instrument
Span overcomes direct range measurement affected by environment big, the serious drawback of error from bring environmental error.2, the present invention is abundant
In view of shaking bring measurement error due to observation vessel hull, parameter will be shaken and participate in calculating, effectively improve blowout fluid liquid
Column height measurement accuracy.Angle measurement of the invention is unrelated with observation vessel course, the speed of a ship or plane, brings to observation without observation vessel, equipment
It is easy-to-use, it is easy to operate, it can be widely applied in the measurement of offshore oil natural gas well drilling well blowout fluid liquid-column height.
Detailed description of the invention
Fig. 1 is measuring device structural schematic diagram of the invention；
Fig. 2 is dip measuring device structural schematic diagram of the invention；
Fig. 3 is dip measuring device measuring principle schematic diagram of the invention；
Fig. 4 is liquid-column height schematic diagram calculation of the invention；
Fig. 5 is that hull shakes schematic diagram in the present invention, wherein figure (a) is that rolling schematic diagram occurs for hull, and figure (b) is ship
Trim schematic diagram occurs for body；
Fig. 6 is liquid-column height Computing Principle when gas blowout accident point of the present invention is on the extended line of three observation point lines
Figure；
Fig. 7 be hull course of the present invention be in using gas blowout accident point as the center of circle, between distance be radius tangent to periphery on
Liquid-column height schematic diagram calculation.
Specific embodiment
Come to carry out detailed description to the present invention below in conjunction with attached drawing.It should be appreciated, however, that attached drawing has been provided only more
Understand the present invention well, they should not be interpreted as limitation of the present invention.
Embodiment 1：
As shown in Figure 1, provided by the invention be based on hull freedom degree offshore drilling blowout fluid liquid-column height measuring device,
Including at least three dip measuring devices 1 (1 quantity of dip measuring device of the present embodiment is three, as example), a signals
Conditioning and pretreatment unit 2, a data acquisition unit 3 and a computer 4, wherein three dip measuring devices 1 are along observation vessel
Hull direction is fixed on hull at equal intervals, and three dip measuring devices 1 are arranged along the height such as same straight line.
As shown in Fig. 2, each dip measuring device 1 include structure stand 11, lever arm 12, high point surveillance mirror 13,
Angle measuring sensor 14, index glass 15, race glass 16 and fixed mirror 17.11 back side of structure stand is flexibly connected lever arm
12, high point surveillance mirror 13 is fixedly installed in 12 top of lever arm, and high point surveillance mirror 13 is for the anti-of inspection well hydrojet column highest point
Penetrate mirror.Angle measuring sensor 14 is further fixedly arranged on lever arm 12.11 upper end of structure stand is provided with for accommodating high point
The through-hole of surveillance mirror 13, high point surveillance mirror 13 can rotate in above-mentioned through-hole.Index glass 14 is movably set on structure stand 11,
Index glass 14 can use convex lens, and index glass 14 can rotate in a certain range plays optically focused focusing increase display, and it is clear to improve
The effect of degree.It is further fixedly arranged on race glass 16 and fixed mirror 17 on structure stand 11, needs to guarantee race glass 16
It is located on same level straight line with fixed mirror 17.Wherein, fixed mirror 17 can use semi-transparent semi-reflecting plane mirror, guarantee by
The blowout fluid fluid column highest point successively reflected through high point surveillance mirror 13 and index glass 14 horizontally enters into race glass 16.
Each angle measuring sensor 14 is all connected with signal condition and pretreatment unit 2, each angle measuring sensor 14
It obtains angle measurement and is sent to signal condition and pretreatment unit 2, signal condition surveys received angle with pretreatment unit 2
Magnitude by data acquisition acquisition unit 3 is sent to computer 4 after being handled, wherein signal condition and pretreatment unit 2 can be with
Enhance valid signal strengths for going noise wave removing to influence using existing device, maximally reduce wind-force or human factor
Influence to measurement result.
Preferably, structure stand 11 and 12 bottom of lever arm are disposed as arc, and the bottom of lever arm 12 and structure branch
The bottom of frame 11 is tangent, and the bottom of lever arm 12, which is extended forward, arc-shaped limit block 121, and arc-shaped limit block 121 is in order to anti-
Only lever arm 12 is swayed forwards and backwards with structure stand 11.
Preferably, the amplification factor of race glass 16 can select 10~60 times, and size answers commensurate structure bracket 11 big
Small, length is about the 1/2 of 11 height of structure stand, and lens barrel eyepiece diameter is about the 1/8 of 11 height of structure stand.
Preferably, fixed screw has can be set in lever arm 12, and after observation angle adjustment, rotary fixing screw silk will
Lever arm 12 is fixed on structure stand 11, human error caused by reducing because of manual operation.
Preferably, several lightening holes 18 and hand hole 19 are also provided on structure stand 11.
Preferably, angle measuring sensor 14 can use 50Hz alternating signal, can export 50 angles every second
Measured value, it can calculate 50 blowout fluid liquid-column heights.
Preferably, data acquisition unit 3 also acquires observation hull self-sensor device for reflecting observation vessel hull status number
According to hull status data includes deck in ship structure height h, vessel draft depth h1, the height h of angle measuring sensor2, hull cross
Shake angle, θ1With hull trim angle θ2, guarantee that hull status data and inclination data are in synchronization, hull self-sensor device
For the sensor that observation vessel itself has, details are not described herein.
Embodiment 2：
The present invention also provides the measurement method based on hull freedom degree offshore drilling blowout fluid liquid-column height measuring device,
Particular content is：
1, as shown in Figure 1, three dip measuring devices 1 are fixedly mounted on the hull of observation vessel, three inclination angle measurements
Device 1 is same arranged in a straight line along hull direction at equal intervals.
2, each dip measuring device 1 is separately connected signal condition and pretreatment unit 2, and by signal condition and pre-processed
Device 2, data acquisition unit 3 and computer 4 are sequentially connected, and boot up self-test to each equipment.
3, as shown in figure 3, it is the race glass 16 of three dip measuring devices 1 is horizontal positioned, while being directed at blowout
Fluid low dot location, adjusting lever arm 12 makes high point surveillance mirror 13 be directed at blowout fluid high point position, and rotation index glass 14 makes light
The incoming race glass 11 of level, blowout fluid fluid column angulation is δ at this time, and it is ω that lever arm 12, which turns over angle, is computed δ
=2 ω, angle measuring sensor 14 send signal condition and pretreatment unit 2, signal for the angle measurement of acquisition in real time
Conditioning will pass through data acquisition unit 3 with pretreatment unit 2 and be sent to computer 4, simultaneous computer 4 after the signal processing of acquisition
The hull status information of observation vessel is also obtained by data acquisition unit 3.
4, computer 4 obtains blowout fluid liquid-column height for handling angle measurement and hull status information
Data, detailed process are：
As shown in Figure 3, Figure 4, observation point spacing is d, and deck in ship structure height h absorbs water for h1, angle measuring sensor height
For h2, 3 observation point observation inclination values are respectively α from observation vessel1, α2, α3.It can be obtained according to trigonometric function fundamental theorem：
It can be obtained using the cosine law respectively in triangle ABD and triangle ACD：
Joint type (2) can be obtained with formula (3)：
Joint type (1) can obtain the above height H of angle measuring sensor with formula (4)：
So blowout fluid column overall height HAlwaysFor：
Consider that rolling, as shown in Fig. 5 (a), roll angle θ occur for hull1, dip measuring device institute measuring angle becomes former
Angle adds roll angle, therefore should subtract roll angle when calculating, it is contemplated that arriving hull rolling blowout liquid-column height HAlwaysFor：
Consider that trim, as shown in Fig. 5 (b), trim angle θ occur for hull2, dip measuring device is not in same water together
On horizontal line, it is contemplated that hull trim blowout liquid-column height HAlwaysFor：
Further, as shown in fig. 6, if when gas blowout accident point is on the extended line of three observation point lines, according to triangle
Functional dependence variation, it is only necessary to which elevation carrection can be completed in any two observation point angle-data, such as takes A, two observation points of B
It calculates：
It is divided into d between L1 and L2, therefore has
L1-L2=d (10)
Formula (9) is brought into formula (10) and is obtained
Similarly, B is taken, C two o'clock obtains calculation formula and is：
Similarly, A is taken, the calculation formula of C two o'clock is：
Further, if hull course be in using gas blowout accident point as the center of circle, between distance be radius tangent to periphery on,
Only need intermediate sight point and any one observation point measurement angle data of edge that elevation carrection can be completed, as shown in fig. 7, A is
Any one observation point of edge, B are intermediate sight point, and detailed process is：
AB=d is brought into right angled triangle ABD, can be obtained：
Solution formula (16)：
To sum up obtaining height calculation formula is
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (10)
1. one kind is based on hull freedom degree offshore drilling blowout fluid liquid-column height measurement method, it is characterised in that including following interior
Hold：
All measuring devices are fixed on hull at equal intervals along the hull direction of observation vessel, and all dip measuring devices
It is arranged along the height such as same straight line；
The race glass of all dip measuring devices is horizontal positioned, while it being directed at blowout fluid low dot location, adjust institute
There is the high point surveillance mirror alignment blowout fluid high point position of dip measuring device, so that blowout fluid high point position level is passed to phase
Answer race glass；
The hull status information of inclination angle and observation vessel is observed based on each observation point, calculates blowout fluid liquid-column height.
2. the offshore drilling blowout fluid liquid-column height measurement method according to claim 1 based on hull freedom degree,
It is characterized in that, when dip measuring device is set as three, blowout fluid liquid-column height HAlwaysFor：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height, from
3 observation point observation inclination values are respectively α on observation vessel1, α2, α3；
If rolling, roll angle θ occur for hull1, blowout liquid-column height HAlwaysFor：
If trim, trim angle θ occur for hull2, blowout liquid-column height HAlwaysFor：
3. the offshore drilling blowout fluid liquid-column height measurement method according to claim 1 based on hull freedom degree,
It is characterized in that, if gas blowout accident point is on the extended line of three observation point lines, blowout liquid-column height HAlwaysFor HTotal 1、HTotal 2Or HTotal 3
One of：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height, from
3 observation point observation inclination values are respectively α on observation vessel1, α2, α3。
4. the offshore drilling blowout fluid liquid-column height measurement method according to claim 1 based on hull freedom degree,
Be characterized in that, if hull course be in using gas blowout accident point as the center of circle, between distance be radius tangent to periphery on, pass through centre
Observation point and any one observation point measurement angle data of edge obtain blowout liquid-column height HAlwaysFor：
In formula, d is observation point spacing, and h is deck in ship structure height, h1For draft, h2For angle measuring sensor height, side
The observation point observation inclination value of edge is α1, it is α that intermediate sight point, which observes inclination value,2。
5. described in any item based on the measurement of hull freedom degree offshore drilling blowout fluid liquid-column height to 4 according to claim 1
Method, which is characterized in that be additionally provided with a blowout fluid liquid-column height measuring device, the blowout fluid liquid-column height measurement dress
It sets including at least three dip measuring devices, signal condition and pretreatment unit, data acquisition unit and computer,
In, the angle measurement that each dip measuring device is used to will acquire is sent to the signal condition and pretreatment unit,
The signal condition and pretreatment unit are sent out after being handled received angle measurement by data acquisition acquisition unit
It is sent to the computer and blowout fluid liquid-column height is calculated.
6. according to claim 1 to 4 any offshore drilling blowout fluid liquid-column height measurement methods, which is characterized in that
The each dip measuring device further includes bracket, lever arm, angle measuring sensor and fixed mirror；The structure stand back
Face is flexibly connected the lever arm, and the lever arm top is fixedly installed the high point surveillance mirror, also sets up on the lever arm
There is the angle measuring sensor for measuring observation point observation inclination angle；The structure stand upper end is provided with for accommodating
State the through-hole of high point surveillance mirror；The index glass is arranged in activity on the structure stand, is further fixedly arranged on the structure stand
Race glass and fixed mirror, and the race glass and fixed mirror are located at same level straight line；Wherein, the fixed mirror energy
It is enough that the blowout fluid fluid column highest point successively reflected through the high point surveillance mirror and index glass is horizontally entered into the race glass.
7. offshore drilling blowout fluid liquid-column height measurement method according to claim 6, which is characterized in that the structure
The bottom of bracket and lever arm is disposed as arc, and the bottom of the lever arm and the bottom of the structure stand are tangent, institute
Stating lever arm bottom and being extended forward has the arc-shaped limit for preventing the lever arm and the structure stand from swaying forwards and backwards
Block.
8. offshore drilling blowout fluid liquid-column height measurement method according to claim 6, which is characterized in that the index glass
Increase the convex lens shown using optically focused focusing is played, the fixed mirror uses semi-transparent semi-reflecting plane mirror.
9. offshore drilling blowout fluid liquid-column height measurement method according to claim 6, which is characterized in that described small-sized
The amplification factor of telescope is 10~60 times, and length is the 1/2 of the structure stand height, and lens barrel eyepiece diameter is the structure
The 1/8 of support height.
10. offshore drilling blowout fluid liquid-column height measurement method according to claim 6, which is characterized in that the work
It is provided on swing arm for by rotating the screw being fixed with the structure stand.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112431587A (en) * | 2020-12-22 | 2021-03-02 | 山东省交通规划设计院有限公司 | Real-time exploration hole depth detection device and method |
| CN114264518A (en) * | 2021-11-15 | 2022-04-01 | 山东大学 | High altitude atmospheric pollutants sample collection system |
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| CN205157780U (en) * | 2015-11-27 | 2016-04-13 | 盐城工学院 | Laser height finding range unit |
| CN206192330U (en) * | 2016-12-02 | 2017-05-24 | 黑龙江省畜牧研究所 | Portable height measurement appearance |
| CN206301043U (en) * | 2016-12-01 | 2017-07-04 | 西安长庆科技工程有限责任公司 | A kind of device for measuring overhead transmission line height |
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| CN103148786A (en) * | 2013-01-15 | 2013-06-12 | 南京林业大学 | Device and method for height measurement of object |
| CN205157780U (en) * | 2015-11-27 | 2016-04-13 | 盐城工学院 | Laser height finding range unit |
| CN206301043U (en) * | 2016-12-01 | 2017-07-04 | 西安长庆科技工程有限责任公司 | A kind of device for measuring overhead transmission line height |
| CN206192330U (en) * | 2016-12-02 | 2017-05-24 | 黑龙江省畜牧研究所 | Portable height measurement appearance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112431587A (en) * | 2020-12-22 | 2021-03-02 | 山东省交通规划设计院有限公司 | Real-time exploration hole depth detection device and method |
| CN112431587B (en) * | 2020-12-22 | 2022-12-23 | 山东省交通规划设计院集团有限公司 | Device and method for detecting depth of exploration hole in real time |
| CN114264518A (en) * | 2021-11-15 | 2022-04-01 | 山东大学 | High altitude atmospheric pollutants sample collection system |
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| Publication number | Publication date |
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| CN108917704B (en) | 2021-07-13 |
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