CN108917704B - Offshore drilling blowout fluid liquid column height measuring method based on hull degree of freedom - Google Patents
Offshore drilling blowout fluid liquid column height measuring method based on hull degree of freedom Download PDFInfo
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- CN108917704B CN108917704B CN201810902299.8A CN201810902299A CN108917704B CN 108917704 B CN108917704 B CN 108917704B CN 201810902299 A CN201810902299 A CN 201810902299A CN 108917704 B CN108917704 B CN 108917704B
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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
Abstract
The invention relates to a hull freedom degree based offshore drilling blowout fluid liquid column height measuring method, which comprises the steps that all inclination angle measuring devices are fixedly arranged on a hull at equal intervals along the direction of the hull of an observation ship, and are arranged at equal heights along the same straight line; horizontally placing the small telescopes of all the dip angle measuring devices, aligning the small telescopes to the low point position of the blowout fluid, adjusting the high point observation mirrors of all the dip angle measuring devices to align to the high point position of the blowout fluid, and horizontally transmitting the high point position of the blowout fluid into the corresponding small telescopes; and calculating the height of the well-blowout fluid liquid column based on the observation inclination angle of each observation point and the ship body state information of the observation ship. The invention converts the height of the liquid column which is difficult to be directly measured into three dip angles for measurement, only the angle of the high point of the well-blowout liquid column is required to be measured in the process, the actual distance to the platform is not required to be measured, and the environmental error caused by the severe sea condition to the distance measurement of the laser pulse instrument is reduced.
Description
Technical Field
The invention relates to a method for measuring the height of a blowout fluid liquid column of an offshore drilling well based on the freedom degree of a hull, and relates to the field of drilling of offshore oil and gas wells.
Background
The world ocean petroleum resource reserves are abundant and account for 34 percent of the total amount of the global petroleum resources. With the development of offshore oil and gas exploration and development technology, the ocean oil and gas yield steadily rises and becomes a new growth source of the world oil and gas yield, but offshore drilling and exploitation of oil and gas resources are typical high-return and high-risk investment projects, once a blowout runaway accident happens to a drilling platform, huge economic loss, casualties and ecological disasters can be caused, for example, the blowout runaway explosion accident of the deep water horizon drilling platform in gulf of Mexico in 2010 is successfully rescued for 87 days, the direct economic loss is $ 9.3 billion, and the 160 kilometers of coast is polluted by leaked crude oil.
When the pressure of drilling fluid in a well is lower than the pressure of a stratum due to inaccurate prediction of the pressure of the stratum, low density of drilling fluid, manual operation errors and the like, oil and gas flow can flow into a drilled well hole, and blowout is realized when the inflow amount is large. When the blowout is out of control due to the fact that the blowout cannot be effectively controlled and further worsened, disasters such as fire and explosion of a drilling platform can be caused, and environmental pollution and great economic loss can be caused when the blowout accident happens. Due to the particularity of ocean oil and gas resources, the stratum pressure prediction accuracy is low, the probability of blowout in the drilling process is high, the blowout can be quickly and effectively controlled in the initial stage of blowout occurrence is the most effective means for preventing the out-of-control accident of the blowout, the blowout preventer needs to be closed after the blowout occurs to read parameters such as the closing vertical pressure, the closing sleeve pressure and the like, the stratum pressure is judged again, and the parameters cannot be effectively obtained when the blowout preventer fails or personnel with large blowout potential cannot approach the wellhead. At the moment, the formation pressure can be estimated by an indirect method, the height of the well-jet fluid jet is reliable, one of the precious field parameters can be used for calculating the formation pressure by the inversion of the height of the well-jet fluid jet, and the technical guarantee is provided for the subsequent well killing operation. When well blowout occurs and the well cannot be closed effectively, drilling platform personnel need to withdraw from the platform and arrive at a safe position, the height of the well blowout fluid cannot be directly measured and can only be remotely observed on a rescue ship or a measuring ship, and for the condition, the following methods can be adopted for remotely measuring the height of the well blowout fluid liquid column:
1. laser electric measuring method
And on the rescue ship, measuring the distance L between the rescue ship and the ocean platform by using a laser pulse distance meter. And measuring the high point inclination angle alpha of the well jet fluid by using a theodolite. According to the triangle pythagorean theorem, the height H of the blowout fluid is L.sin alpha. However, the use of the laser pulse distance measuring instrument is greatly limited, and the measured object needs to be capable of strongly reflecting the optical pulse signal, that is, the instrument can only measure the ocean platform structure body and cannot directly measure the well-blowout liquid column. If sea wind is strong, the liquid column deviates from the platform, and the measurement result is distorted; if the well blowout is strong, the ocean platform is lost, and the method is invalid.
2. Air pressure measuring method
And (3) using an unmanned aerial vehicle to carry an air pressure measuring instrument, measuring the air pressure value of the high point of the well spray liquid column and the air pressure value of the sea level, and calculating the height of the well spray liquid column by using the air pressure difference value. The method has a plurality of defects in the using process, firstly, the unmanned aerial vehicle cannot accurately hover at the high point position of the well-blowout liquid column, and the measurement of the high point air pressure value is inaccurate; secondly, the well blowout position environment is complex and severe, the damage to the unmanned aerial vehicle is huge, and huge economic loss is caused, so that the method is not suitable for well blowout height measurement.
3. Picture pixel method
On the rescue ship, the high-precision camera can be used for shooting the well-blowout liquid column by means of the unmanned aerial vehicle, vanishing point information and characteristic object parameters in a picture shot by the fixed camera are obtained, parameter optimization is carried out by utilizing a genetic algorithm, and then height measurement can be completed. However, the measurement mode requires that the picture has extremely high pixels, is influenced by distance and marine climate environment, has serious jolt when the machine works, has low picture resolution, cannot ensure measurement accuracy, and has larger error.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a hull freedom degree based offshore drilling blowout fluid column height measuring method for accurately measuring the height of a blowout fluid column and solving the problem of bottom hole pressure measurement in blowout accidents.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for measuring the height of a blowout fluid column of an offshore drilling well based on the freedom degree of a hull comprises the following steps:
all the measuring devices are fixedly arranged on the ship body at equal intervals along the direction of the ship body of the observation ship, and all the inclination angle measuring devices are arranged at equal height along the same straight line;
horizontally placing the small telescopes of all the dip angle measuring devices, aligning the small telescopes to the low point position of the blowout fluid, adjusting the high point observation mirrors of all the dip angle measuring devices to align to the high point position of the blowout fluid, and horizontally transmitting the high point position of the blowout fluid into the corresponding small telescopes;
and calculating the height of the well-blowout fluid liquid column based on the observation inclination angle of each observation point and the ship body state information of the observation ship.
Further, it is characterized in that when the inclination angle measuring device is set to three, the height H of the well-blowout fluid liquid columnGeneral assemblyComprises the following steps:
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For measuring the height of the sensor by angle, the values of the inclination angles observed from 3 observation points on the observation ship are respectively alpha1，α2，α3；
If the ship body rolls, the rolling angle is theta1Height H of well jet liquid columnGeneral assemblyComprises the following steps:
if the hull is trim, the trim angleDegree theta2Height H of well jet liquid columnGeneral assemblyComprises the following steps:
further, if the blowout accident point is on the extension line of the connecting line of the three observation points, the height H of the blowout liquid columnGeneral assemblyIs HGeneral 1、HGeneral 2Or HTotal 3One of (1):
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For measuring the height of the sensor by angle, the values of the inclination angles observed from 3 observation points on the observation ship are respectively alpha1，α2，α3。
Further, if the ship body course is positioned on a circumferential tangent line which takes the blowout accident point as the circle center and the distance between the blowout accident points as the radius, the height H of the blowout liquid column is obtained by measuring angle data through the middle observation point and any one observation point at the edgeGeneral assemblyComprises the following steps:
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For angular measurement of the height of the sensor, the observation point of the edge has an inclination value of alpha1The value of the observed dip angle of the middle observation point is alpha2。
The device comprises at least three dip angle measuring devices, a signal conditioning and preprocessing device, a data acquisition unit and a computer, wherein each dip angle measuring device is used for sending an obtained angle measurement value to the signal conditioning and preprocessing device, and the signal conditioning and preprocessing device processes the received angle measurement value and then sends the processed angle measurement value to the computer through the data acquisition unit to calculate the height of the well-blowout fluid column.
Furthermore, each inclination angle measuring device also comprises a bracket, a movable arm, an angle measuring sensor and a fixed mirror; the back of the structural support is movably connected with the movable arm, the top end of the movable arm is fixedly provided with the high-point observation mirror, and the movable arm is also provided with the angle measurement sensor for measuring an observation inclination angle of an observation point; the upper end of the structural support is provided with a through hole for accommodating the high-point observation mirror; the movable mirror is movably arranged on the structural support, a small telescope and a fixed mirror are fixedly arranged on the structural support, and the small telescope and the fixed mirror are positioned on the same horizontal straight line; the fixed mirror can horizontally enable the highest point of the well-blowout fluid column reflected by the high-point observation mirror and the movable mirror in sequence to enter the small telescope.
Further, the bottom of structural support and digging arm all sets up to the arc, just the bottom of digging arm with the bottom of structural support is tangent, the digging arm bottom extends forward and is provided with and prevents the digging arm with the arc stopper that rocks around the structural support takes place.
Furthermore, the movable mirror adopts a convex lens which can focus light and increase display, and the fixed mirror adopts a semi-transparent and semi-reflective plane mirror.
Furthermore, the magnification of the small telescope is 10-60 times, the length of the small telescope is 1/2 times of the height of the structural support, and the diameter of the lens cone eyepiece is 1/8 times of the height of the structural support.
Furthermore, a screw used for fixing the structural support through rotation is arranged on the movable arm.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention converts the liquid column height which is difficult to be directly measured into the dip angle measurement, and can obtain the offshore drilling liquid column height by applying the related knowledge of the trigonometric function, only the height angle of the well-blowout liquid column is needed to be measured in the process, the actual distance to the platform is not needed to be measured, the environmental error caused by the severe sea condition to the distance measurement of the laser pulse instrument is reduced, and the defects of large environmental influence and serious error in the direct distance measurement are overcome. 2. The invention fully considers the measurement error caused by the shaking of the observation ship body, participates in the calculation of the shaking parameters, and effectively improves the measurement precision of the height of the blowout fluid liquid column. The angle measurement of the invention is irrelevant to the course and the navigation speed of the observation ship, the observation ship does not need to be stopped for observation, the equipment is convenient to use and simple to operate, and the angle measurement method can be widely applied to the height measurement of the blowout fluid column of the drilling well of the offshore oil and gas well.
Drawings
FIG. 1 is a schematic view of the structure of the measuring device of the present invention;
FIG. 2 is a schematic view of the tilt angle measuring device of the present invention;
FIG. 3 is a schematic view of the measurement principle of the inclination angle measuring device of the present invention;
FIG. 4 is a schematic diagram of the calculation of liquid column height according to the present invention;
FIG. 5 is a schematic view of the rolling of the hull of the present invention, wherein (a) is a schematic view of the rolling of the hull and (b) is a schematic view of the pitching of the hull;
FIG. 6 is a schematic diagram of the calculation of the height of the fluid column when the blowout accident point is on the extension of the connecting line of the three observation points according to the present invention;
FIG. 7 is a schematic diagram of the calculation of the height of the liquid column of the hull of the present invention on the tangent line of the circumference with the distance between the well blowout accident points as the radius.
Detailed Description
The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.
Example 1:
as shown in fig. 1, the device for measuring the height of a fluid column of a marine drilling blowout well based on the freedom degree of a ship body provided by the invention comprises at least three inclination angle measuring devices 1 (the number of the inclination angle measuring devices 1 in the embodiment is three, for example), a signal conditioning and preprocessing device 2, a data acquisition unit 3 and a computer 4, wherein the three inclination angle measuring devices 1 are fixedly arranged on the ship body at equal intervals along the direction of the ship body of an observation ship, and the three inclination angle measuring devices 1 are arranged at equal height along the same straight line.
As shown in fig. 2, each tilt measuring device 1 includes a structural support 11, a movable arm 12, a high-point observation mirror 13, an angle measuring sensor 14, a movable mirror 15, a small telescope 16, and a fixed mirror 17. The back of the structural support 11 is movably connected with a movable arm 12, a high-point observation mirror 13 is fixedly arranged at the top end of the movable arm 12, and the high-point observation mirror 13 is a reflector for observing the highest point of the well-blowout liquid column. An angle measuring sensor 14 is also fixedly arranged on the movable arm 12. The upper end of the structural support 11 is provided with a through hole for accommodating the high point observation mirror 13, and the high point observation mirror 13 can rotate in the through hole. The movable mirror 14 is movably arranged on the structure support 11, the movable mirror 14 can be a convex lens, and the movable mirror 14 can rotate in a certain range to focus light and increase display and improve definition. The structure support 11 is also fixedly provided with a small telescope 16 and a fixed mirror 17, and the small telescope 16 and the fixed mirror 17 are required to be ensured to be positioned on the same horizontal straight line. The fixed mirror 17 can be a semi-transparent semi-reflective plane mirror, so that the highest point of the well-blowout fluid column reflected by the high-point observation mirror 13 and the movable mirror 14 in sequence can horizontally enter the small telescope 16.
Each angle measurement sensor 14 is connected with the signal conditioning and preprocessing device 2, each angle measurement sensor 14 acquires an angle measurement value and sends the angle measurement value to the signal conditioning and preprocessing device 2, the signal conditioning and preprocessing device 2 processes the received angle measurement value and sends the angle measurement value to the computer 4 through the data acquisition and collection unit 3, wherein the signal conditioning and preprocessing device 2 can adopt the existing device and is used for removing clutter influence, enhancing effective signal intensity and reducing the influence of wind power or human factors on measurement results to the maximum extent.
Preferably, the bottoms of the structural support 11 and the movable arm 12 are both arc-shaped, the bottom of the movable arm 12 is tangent to the bottom of the structural support 11, the bottom of the movable arm 12 extends forwards to be provided with an arc-shaped limiting block 121, and the arc-shaped limiting block 121 is used for preventing the movable arm 12 and the structural support 11 from shaking forwards and backwards.
Preferably, the magnification of the small telescope 16 is 10-60 times, the magnification is adapted to the size of the structural support 11, the length is about 1/2 of the height of the structural support 11, and the diameter of the eyepiece of the lens barrel is about 1/8 of the height of the structural support 11.
Preferably, the movable arm 12 may be provided with a fixing screw, and after the observation angle is adjusted, the fixing screw is rotated to fix the movable arm 12 on the structural support 11, so as to reduce human errors caused by manual operation.
Preferably, the structure support 11 may also be provided with a plurality of lightening holes 18 and a plurality of hand-holding holes 19.
Preferably, the angle measurement sensor 14 may use a 50Hz alternating signal that may output 50 angle measurements per second, i.e., may calculate 50 heights of the fluid column of the blowout fluid.
Preferably, the data acquisition unit 3 further acquires a sensor of the observation ship body for reflecting the ship body state data of the observation ship body, wherein the ship body state data comprises the ship body deck height h and the ship body draft depth h1Height h of angle measuring sensor2Angle of rolling of ship body theta1And the hull trim angle theta2And the state data of the ship body and the inclination angle data are ensured to be at the same moment, and the sensor of the ship body is a sensor for observing the ship body, which is not repeated herein.
Example 2:
the invention also provides a measuring method of the offshore drilling blowout fluid liquid column height measuring device based on the freedom degree of the ship body, which comprises the following specific contents:
1. as shown in fig. 1, three inclination measuring devices 1 are fixedly mounted on the hull of the observation ship, and the three inclination measuring devices 1 are arranged in the same line at equal intervals along the hull direction.
2. And respectively connecting each inclination angle measuring device 1 with a signal conditioning and preprocessing device 2, sequentially connecting the signal conditioning and preprocessing device 2, a data acquisition unit 3 and a computer 4, and carrying out power-on self-test on each device.
3. As shown in fig. 3, the small telescopes 16 of the three inclination measuring devices 1 are all horizontally placed and aligned with the low point position of the well-jet fluid, the movable arm 12 is adjusted to align the high point observation mirror 13 with the high point position of the well-jet fluid, the movable mirror 14 is rotated to horizontally transmit light into the small telescope 11, the angle formed by the well-jet fluid column is delta, the angle formed by the rotation of the movable arm 12 is omega, the delta is calculated to be 2 omega, the angle measurement sensor 14 transmits the collected angle measurement value to the signal conditioning and preprocessing device 2 in real time, the signal conditioning and preprocessing device 2 processes the collected signal and transmits the processed signal to the computer 4 through the data acquisition unit 3, and the computer 4 also acquires the hull state information of the observation ship through the data acquisition unit 3.
4. The computer 4 is used for processing the angle measurement value and the ship body state information to obtain the height data of the blowout fluid liquid column, and the specific process is as follows:
as shown in fig. 3 and 4, the distance between observation points is d, the height of the deck of the ship body is h, and the draught is h1The height of the angle measuring sensor is h2The values of the inclination angles observed from 3 observation points on the observation ship are respectively alpha1，α2，α3. According to the basic theorem of trigonometric functions, the following can be obtained:
applying cosine theorem in triangle ABD and triangle ACD respectively can obtain:
the joint type (2) and the formula (3) can obtain:
the height H above the angle measurement sensor obtained by the joint vertical type (1) and the formula (4) is as follows:
therefore, the total height H of the well jet liquid columnGeneral assemblyComprises the following steps:
considering the occurrence of rolling of the hull, as shown in FIG. 5(a), the rolling angle is θ1The angle measured by the inclination angle measuring device is changed into the original angle plus the rolling angle, so the rolling angle is subtracted during calculation, and the height H of the jet liquid column of the hull rolling well is consideredGeneral assemblyComprises the following steps:
considering the occurrence of the pitching of the hull, the pitching angle is θ as shown in fig. 5(b)2The dip angle measuring devices are not positioned on the same horizontal line, so the height H of the longitudinal inclined well liquid injection column of the ship body is consideredGeneral assemblyComprises the following steps:
further, as shown in fig. 6, if the blowout accident point is on the extension line of the connection line of the three observation points, according to the related change of the trigonometric function, the height measurement can be completed only by angle data of any two observation points, for example, two observation points a and B are taken to calculate:
l1 is spaced from L2 by a distance d, and therefore
L1-L2＝d (10)
Substituting equation (9) into equation (10) to obtain
Similarly, the calculation formula obtained by taking the points B and C is as follows:
similarly, the calculation formula of the points A and C is taken as follows:
further, if the ship course is on a circumferential tangent line which takes the blowout accident point as the circle center and the distance between the blowout accident points as the radius, the height measurement can be completed only by measuring angle data of the middle observation point and any one of the observation points at the edge, as shown in fig. 7, a is any one of the observation points at the edge, B is the middle observation point, and the specific process is as follows:
substituting AB ═ d into the right triangle ABD, we can get:
solving equation (16) yields:
the height calculation formula is obtained in a way that
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. A method for measuring the height of a blowout fluid column of an offshore drilling well based on the freedom degree of a ship body is characterized by comprising the following steps:
at least three dip angle measuring devices are fixedly arranged on a ship body at equal intervals along the direction of the ship body of the observation ship, and all the dip angle measuring devices are arranged at equal height along the same straight line; the inclination angle measuring device comprises a structural support, a movable arm, an angle measuring sensor and a fixed mirror, wherein the back of the structural support is movably connected with the movable arm, the top end of the movable arm is fixedly provided with a high-point observation mirror, and the movable arm is also provided with the angle measuring sensor for measuring the observation inclination angle of an observation point; the upper end of the structural support is provided with a through hole for accommodating the high-point observation mirror; a movable mirror which plays a role of focusing and enlarging display is movably arranged on the structural support, a small telescope and a fixed mirror are also fixedly arranged on the structural support, and the small telescope and the fixed mirror are positioned on the same horizontal straight line; the fixed mirror can horizontally transmit light rays emitted by the highest point position of the well-blowout fluid liquid column reflected by the high-point observation mirror into the small telescope; wherein, the observation inclination angle is an included angle between a connecting line of a high point position of the well jet fluid and the high point observation mirror and the sea level;
horizontally placing the small telescopes of all the dip angle measuring devices, aligning the small telescopes to the low point position of the blowout fluid, adjusting the high point observation mirrors of all the dip angle measuring devices to align to the high point position of the blowout fluid, and horizontally transmitting light rays emitted from the high point position of the blowout fluid into the corresponding small telescopes;
and calculating the height of the well-blowout fluid liquid column based on the observation inclination angle of each observation point and the ship body state information of the observation ship.
2. The hull freedom degree based offshore drilling blowout fluid liquid column height measuring method according to claim 1, wherein when the inclination angle measuring device is set to three, the blowout fluid liquid column height HGeneral assemblyComprises the following steps:
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For measuring the actual height of the sensor by the angle arranged on the ship body, the observation inclination angles of 3 observation points on the observation ship are respectively alpha1，α2，α3；
If the ship body rolls, the rolling angle is theta1Height H of well jet liquid columnGeneral assemblyComprises the following steps:
if the ship body is in trim, the trim angle is theta2Height H of well jet liquid columnGeneral assemblyComprises the following steps:
3. the hull freedom based offshore drilling blowout fluid column height measurement method of claim 1, wherein if a blowout accident point occursWhen on the extension line of the connecting line of the three observation points, the height H of the well-blowout liquid columnGeneral assemblyIs HGeneral 1、HGeneral 2Or HTotal 3One of (1):
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For measuring the height of the sensor by angle, the inclination angles observed from 3 observation points on the observation ship are respectively alpha1，α2，α3。
4. The hull freedom degree-based offshore drilling blowout fluid column height measuring method according to claim 1, wherein if the hull course is on a circumferential tangent line taking the blowout accident point as the center and the distance between the blowout accident points as the radius, the blowout fluid column height H is obtained by measuring angle data through a middle observation point and any one of the observation points at the edgeGeneral assemblyComprises the following steps:
wherein d is the distance between observation points, h is the height of the deck of the ship body, and h1To draft, h2For measuring the actual height of the sensor by the angle arranged on the ship body, the observation point of the edge observes an inclination angle alpha1The observation inclination angle of the middle observation point is alpha2。
5. The hull freedom degree based offshore drilling blowout fluid column height measuring method according to any one of claims 1 to 4, wherein a blowout fluid column height measuring device is further provided, the blowout fluid column height measuring device comprises at least three inclination angle measuring devices, a signal conditioning and preprocessing device, a data acquisition unit and a computer, each inclination angle measuring device is used for sending the obtained observed inclination angle to the signal conditioning and preprocessing device, and the signal conditioning and preprocessing device processes the received observed inclination angle and sends the processed observed inclination angle to the computer through the data acquisition unit to calculate the blowout fluid column height.
6. The hull freedom degree based offshore drilling blowout fluid column height measuring method according to any one of claims 1 to 4, wherein the structural support and the bottom of the movable arm are both arc-shaped, the bottom of the movable arm is tangent to the bottom of the structural support, and an arc-shaped limiting block for preventing the movable arm and the structural support from shaking back and forth extends forwards from the bottom of the movable arm.
7. The hull freedom degree based offshore drilling blowout fluid column height measuring method according to any one of claims 1 to 4, wherein the movable mirror adopts a convex lens, and the fixed mirror adopts a semi-transparent and semi-reflective plane mirror.
8. The marine hull freedom based offshore drilling blowout fluid column height measurement method according to any one of claims 1 to 4, wherein the small telescope is 10-60 times magnified, the length is 1/2 times the structural support height, and the drawtube eyepiece diameter is 1/8 times the structural support height.
9. The hull freedom based offshore drilling blowout fluid column height measurement method of any one of claims 1 to 4, wherein a screw for fixing with the structural support by rotation is provided on the movable arm.
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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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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