CN114000869B - Method for detecting liquid level of shaft - Google Patents
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Abstract
The invention discloses a method for detecting the liquid level of a shaft, which comprises the following steps: s1, operating a detector mounting device, releasing the liquid level detector, and enabling the liquid level detector to fall in a shaft; s2, measuring the time of the liquid level detector passing through different well sections; and S3, calculating the liquid level depth in real time by the host computer. The invention solves the following problems in the prior art: the method is difficult to accurately detect the liquid level position of the well to be detected with complex well track and the dynamic change speed of the liquid level in real time, has complex structure, high cost, larger error of the liquid level position monitoring result, weaker anti-interference capability and the like.
Description
Technical Field
The invention relates to the technical field of exploration, in particular to a method for detecting the liquid level of a shaft.
Background
Currently, existing level monitoring devices typically determine the level of a liquid by calculating the time difference between the emission and reflection of the sound wave. The liquid level monitoring device based on sound waves is generally arranged at the end part of a branch line of a ground throttling manifold, is fixedly arranged, cannot be lower than the pressure level of the manifold, and has the advantages of complex structure, large volume and high cost; the sound source is variable cross section sonic boom, acoustic shock wave, infrasonic wave, electric control sound wave and the like, has weak anti-interference capability, needs additional operation steps such as drilling stopping, well closing and sealing device and the like, has long operation period, and especially has less liquid level drop and short sound part reflection time. The prior art has the following problems: the method is difficult to accurately detect the liquid level position of the well to be detected with complex well track and the dynamic change speed of the liquid level in real time, has complex structure, high cost, larger error of the liquid level position monitoring result, weaker anti-interference capability and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for detecting the liquid level of a shaft, which solves the following problems in the prior art: the method is difficult to accurately detect the liquid level position of the well to be detected with complex well track and the dynamic change speed of the liquid level in real time, has complex structure, high cost, larger error of the liquid level position monitoring result, weaker anti-interference capability and the like.
The invention solves the problems by adopting the following technical scheme:
a liquid level detection device for a shaft comprises a host, a liquid level detector and a detector mounting device, wherein the detector mounting device can enable the liquid level detector to be in a fixed state or a release state, and the host can monitor the position of the liquid level detector.
As a preferable technical scheme, the host, the liquid level detector and the detector mounting device can mutually transmit signals.
As a preferable technical scheme, the detector mounting device is provided with a sensor, the sensor can monitor the position of the liquid level detector, and the sensor and the host can mutually carry out signal transmission.
As a preferred technical solution, the probe mounting device includes a position holding mechanism, a release mechanism, the position holding mechanism being fixedly connected with the liquid level probe, the release mechanism being capable of disconnecting the position holding mechanism from the fixed connection with the liquid level probe so as to release the liquid level probe.
As a preferred technical solution, the outer contour shape of the liquid level detector is a sphere, cone or cylinder.
A method for detecting the liquid level of a shaft, which adopts the device for detecting the liquid level of the shaft, comprises the following steps:
s1, operating a detector mounting device, releasing the liquid level detector, and enabling the liquid level detector to fall in a shaft;
s2, measuring the time of the liquid level detector passing through different well sections;
and S3, calculating the liquid level depth in real time by the host computer.
As a preferred technical solution, step S2 includes the following steps:
s21, determining the acceleration of the downlink liquid level detector at different well sections according to the designed well track of the liquid level well to be detected: in the vertical well section, acceleration a of the liquid level detector V Equal to the gravitational acceleration g; in the steady inclined section, the acceleration of the liquid level detector is a H ＝g×(sinθ H -cosθ H X mu), in the deflecting section, the acceleration of the liquid level detector is a B ＝g×(1+sinθ H -cosθ H X μ)/2; wherein θ H Designing a stable bevel angle for a well to be tested, wherein mu is the friction coefficient between a liquid level detector and a well wall;
s22, calculating the length L of the straight well section passing through the free falling body descending liquid level detector at the well head V Length L of deflecting section B Length of steady inclined section L H The time of (c) is sequentially denoted as t V 、t B 、t H The calculation formula is as follows:
in step S3, the time from releasing the liquid level detector to stop transmitting the working signal is recorded as t, and the liquid level depth is calculated in real time, and the calculation formula is as follows:
when t is less than or equal to t V In the time-course of which the first and second contact surfaces,
D L ＝g×t 2 /2；
when t V ＜t≤(t B +t V ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t-t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t-t V ) 2 /2]；
when (t) V +t B )＜t≤(t V +t B +t H ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t B +t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t B +t V ) 2 /2+[g×t V +t B ×g×(1+sinθ H -cosθ H ×μ)/2]×(t-t B -t V )+g×(sinθ H -cosθ H ×μ)×(t-t B -t V ) 2 /2]。
as a preferred technical scheme, the method further comprises the following steps:
s4, calculating the liquid level change speed according to the liquid level depth.
In step S4, the liquid level detector is released for multiple times to detect the liquid level depth, and the ratio of the liquid level depth difference obtained by two adjacent detections to the time difference is calculated.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention is convenient for accurately and real-timely detecting the liquid level position of the well to be detected and the dynamic change speed of the liquid level, and has simple structure, lower cost and small error of the liquid level position monitoring result;
(2) The invention is convenient for timely transmitting, analyzing and displaying the detection signal;
(3) The sensor has high detection precision, sensitive response and strong anti-interference capability;
(4) The invention is convenient for operating and fixing the liquid level detector or releasing the liquid level detector, and is convenient to use;
(5) The invention ensures that the liquid level detector is easy to clamp and is not easy to scrape the inner wall of the shaft;
(6) The invention is convenient for accurately and real-timely detecting the dynamic change of the liquid level position of the well to be detected with complex borehole track;
(7) The invention is convenient for accurately and real-timely detecting the liquid level position of the well to be detected with complex well track and the dynamic change speed of the liquid level;
(8) The invention reduces the errors of measurement and calculation and further improves the detection accuracy and precision.
Drawings
FIG. 1 is a schematic diagram of a well bore fluid level detection apparatus according to the present invention;
FIG. 2 is a diagram showing the transmission of electrical signals from a host system and a detector mounting apparatus (scheme one);
FIG. 3 is a second electrical signal transmission diagram of the host system and the detector mounting apparatus (scheme II);
FIG. 4 is a step diagram of a method for wellbore fluid level detection according to the present invention;
FIG. 5 is a flow chart of a method of wellbore fluid level detection according to the present invention.
The reference numerals and corresponding part names in the drawings: 1. host computer, 2, liquid level detector, 3, detector installation device, 31, position holding mechanism, 32, release mechanism.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 5, a wellbore liquid level detection device comprises a host 1, a liquid level detector 2 and a detector mounting device 3, wherein the detector mounting device 3 can enable the liquid level detector 2 to be in a fixed state or a release state, and the host 1 can monitor the position of the liquid level detector 2.
When in use, the method comprises the following steps: s1, operating a detector mounting device 3, releasing the liquid level detector 2, and enabling the liquid level detector 2 to fall in a shaft; s2, measuring the time of the liquid level detector 2 passing through different well sections; s3, the host computer 1 calculates the liquid level depth in real time.
The device is convenient for accurately and real-timely detecting the liquid level position of the well to be detected and the dynamic change speed of the liquid level, and has the advantages of simple structure, lower cost and small error of the liquid level position monitoring result.
As a preferred embodiment, the host 1, the liquid level detector 2, and the detector mounting device 3 can mutually transmit signals.
This facilitates timely transmission and analysis of the detection signal.
As a preferred solution, the sensor mounting device 3 is provided with a sensor, the sensor can monitor the position of the liquid level detector 2, and the sensor and the host 1 can mutually perform signal transmission.
The sensor has high detection precision, sensitive response and strong anti-interference capability.
As a preferred embodiment, the probe mounting device 3 comprises a position holding mechanism 31 and a release mechanism 32, wherein the position holding mechanism 31 is fixedly connected with the liquid level probe 2, and the release mechanism 32 can disconnect the fixed connection between the position holding mechanism 31 and the liquid level probe 2 so as to release the liquid level probe 2.
This facilitates the handling of fixing the level detector 2 or releasing the level detector 2, which is convenient to use.
As a preferred embodiment, the outer contour of the liquid level sensor 2 is in the form of a sphere, cone or cylinder.
This makes the level detector 2 easy to grip and less prone to scratch the inner wall of the well bore.
Example 2
As further optimization of embodiment 1, this embodiment includes all the technical features of embodiment 1, as shown in fig. 1 to 5, and in addition, this embodiment further includes the following technical features:
a method for detecting the liquid level of a shaft, which adopts the device for detecting the liquid level of the shaft, comprises the following steps:
s1, operating a detector mounting device 3, releasing the liquid level detector 2, and enabling the liquid level detector 2 to fall in a shaft;
s2, measuring the time of the liquid level detector 2 passing through different well sections;
s3, the host computer 1 calculates the liquid level depth in real time.
The device is convenient for accurately and real-timely detecting the liquid level position of the well to be detected and the dynamic change speed of the liquid level, and has the advantages of simple structure, lower cost and small error of the liquid level position monitoring result.
As a preferred technical solution, step S2 includes the following steps:
s21, determining the acceleration of the downlink liquid level detector at different well sections according to the designed well track of the liquid level well to be detected: in the vertical well section, acceleration a of the liquid level detector 2 V Equal to the gravitational acceleration g; in the steady-slope section, the acceleration of the liquid level detector 2 is a H ＝g×(sinθ H -cosθ H X mu) in the deflecting section, the acceleration of the liquid level detector 2 is a B ＝g×(1+sinθ H -cosθ H X μ)/2; wherein θ H The stable bevel angle is designed for the well to be measured, and mu is the friction coefficient between the liquid level detector 2 and the well wall;
s22, calculating the length L of the straight well section passing through the free falling body descending liquid level detector at the well head V Length L of deflecting section B Length of steady inclined section L H The time of (c) is sequentially denoted as t V 、t B 、t H The calculation formula is as follows: :
this facilitates the measurement of the time for the level detector 2 to traverse different sections of the well to be detected where the borehole trajectory is complex.
In step S3, the time from releasing the liquid level detector 2 to stop transmitting the working signal is recorded as t, and the liquid level depth is calculated in real time, where the calculation formula is as follows:
when t is less than or equal to t V In the time-course of which the first and second contact surfaces,
D L ＝gXt 2 /2；
when t V ＜t≤(t B +t V ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t-t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t-t V ) 2 /2]；
when (t) V +t B )＜t≤(t V +t B +t H ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t B +t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t B +t V ) 2 /2+[g×t V +t B ×g×(1+sinθ H -cosθ H ×μ)/2]×(t-t B -t V )+g×(sinθ H -cosθ H ×μ)×(t-t B -t V ) 2 /2]。
this facilitates accurate and real-time detection of dynamic changes in the fluid level position of the well to be detected where the borehole trajectory is complex.
As a preferred technical scheme, the method further comprises the following steps:
s4, calculating the liquid level change speed according to the liquid level depth.
This facilitates accurate and real-time detection of the position of the fluid level of the well to be detected, where the trajectory of the well is complex, and the dynamic rate of change of the fluid level.
As a preferable technical scheme, in step S4, the liquid level detector 2 is released for multiple times to detect the liquid level depth, and the ratio of the liquid level depth difference obtained by two adjacent detections to the time difference is calculated.
This reduces errors in measurement and calculation, further improving detection accuracy and precision.
Example 3
As shown in fig. 1 to 5, this embodiment includes all the technical features of embodiment 1 and embodiment 2, and provides a more detailed embodiment on the basis of embodiment 1 and embodiment 2.
Hardware composition and function: mainframe 1+ level detector 2:
(1) The liquid level detector 2:
the system comprises a singlechip control chip, a signal transceiver module, a power module, a sensor (pressure, capacitance or temperature and the like), a gravity block, a protective shell and the like;
when the liquid level depth starts to be detected:
(1) the host 1 releases the liquid level detector 2 and simultaneously transmits a starting signal to the liquid level detector 2 to start working;
(2) the liquid level detector 2 continuously sends out working signals in the descending process of the free falling body (or gravity sliding);
(3) when the liquid level detector 2 contacts or sinks below the liquid level, the sensor monitors the parameter mutation, the liquid level detector 2 stops working, and no working signal is sent outwards;
(4) the liquid level detector 2 can be formed by combining spheres, cones, cylinders or regular curved surfaces into shapes which are not easy to clamp, such as corner-free shapes, and difficult to scrape.
(2) Host 1
Scheme one: the system comprises a singlechip control chip, a signal transceiver module, a power module, a sensor (pressure, capacitance, photoelectricity and the like), a display module, a detector mounting device 3 and the like.
Scheme II: computers, signal transceiver modules, sensors (optional pressure, tension, capacitance, optoelectronics, etc.), detector mounting means 3, etc.
(1) The detector mounting device 3 is composed of a position holding mechanism 31 and a release mechanism 32, and the release mechanism 32 is provided with a sensor;
(2) when the liquid level detector 2 is released, the sensor parameters change, the host computer 1 sends a starting signal to the liquid level detector 2, the liquid level detector 2 starts to send out a working signal, and the host computer 1 starts to calculate the depth of the liquid level detector 2 in real time until the liquid level detector 2 stops sending out the working signal;
(3) the position holding mechanism 31 restricts the degree of freedom in the horizontal direction of the position of the liquid level detector 2, and holds the position of the liquid level detector 2 in the gravity direction by a bottom baffle, an upper hook, or the like;
(4) when the bottom baffle is pulled away or released, or the liquid level detector 2 is released by cutting off a hook hanging wire and the like, the liquid level detector 2 starts to do free falling motion, the signals of one or more sensors such as the pressure of the baffle or the tension of the hanging wire, the capacitance or the photoelectricity of the position of the liquid level detector 2 are monitored to change obviously, and the singlechip control chip or the computer starts to calculate the position of the liquid level detector 2 in real time.
When the device is used, the liquid level depth and the liquid level change speed can be measured and calculated by adopting the following steps:
1. according to the designed borehole track of the liquid level well to be measured, the acceleration of the downlink liquid level detector at different well sections is determined: in the vertical well section, acceleration a of the liquid level detector 2 V Equal to the gravitational acceleration g; in the steady-slope section, the acceleration of the liquid level detector 2 is a H ＝g×(sinθ H -cosθ H X mu), in manufacture ofThe acceleration of the liquid level detector 2 is a in the inclined section B ＝g×(1+sinθ H -cosθ H X μ)/2; wherein θ H The stable bevel angle is designed for the well to be measured, and mu is the friction coefficient between the liquid level detector 2 and the well wall;
2. calculating the length L of a straight well section passing through a free falling descending liquid level detector at a well head V Length L of deflecting section B Length of steady inclined section L H The time of (c) is sequentially denoted as t V 、t B 、t H The calculation formula is as follows:
3. recording the time from the release of the liquid level detector to the release of the working signal stopping of the liquid level detector as t, and calculating the liquid level depth in real time, wherein the calculation formula is as follows:
when t is less than or equal to t V In the time-course of which the first and second contact surfaces,
D L ＝g×t 2 /2；
when t V ＜t≤(t B +t V ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t-t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t-t V ) 2 /2]；
when (t) V +t B )＜t≤(t V +t B +t H ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t B +t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t B +t V ) 2 /2+[g×t V +t B ×g×(1+sinθ H -cosθ H ×μ)/2]×(t-t B -t V )+g×(sinθ H -cosθ H ×μ)×(t-t B -t V ) 2 /2]。
4. after the liquid level depth is obtained, the liquid level detector 2 can be released for multiple times to detect the liquid level depth, and the ratio of the liquid level depth difference obtained by two adjacent detection to the time difference is the liquid level change speed, so that the liquid level rising or falling speed is judged.
Alternatively, drawing a position and time curve of the liquid level detector 2 in the well hole for the liquid level well to be detected, and directly obtaining the liquid level depth by looking up a table after the host 1 monitors t;
optionally, programming a chip or a computer to establish a well bore liquid level depth calculation function before detection, and displaying the well bore liquid level depth on a display module or the computer after the host 1 monitors t;
alternatively, the host 1 calculates the depth of the liquid level detector 2 in real time until no working signal of the liquid level detector 2 exists, and the display value is the liquid level depth of the shaft;
alternatively, the calculation method of the liquid level depth of the well to be detected with more complex well track can be combined by referring to the calculation methods of the well sections.
The specific operation can be carried out as follows;
1. according to the requirement, arranging a main machine 1, a liquid level detector 2 and a detector mounting device 3 at a wellhead;
2. the number of the liquid level detectors 2 is determined according to the requirements and the liquid level allowable deviation;
3. firstly, an external power supply of a host 1 is connected, a power switch of a liquid level detector 2 is pressed in advance to enter a standby mode, and then the liquid level detector is arranged in a detector mounting device 3;
4. the release switch of the liquid level detector 2 is pressed (the bottom baffle is separated from the switch or the rope is cut, etc.), and the liquid level detector 2 falls freely. When the liquid level detector 2 is perceived to fall through the related sensor connected with the host computer 1, the host computer 1 sends a starting signal transmitting command to the liquid level detector 2 and starts timing (t 1);
5. released from the level detector 2The host 1 analyzes and calculates the real-time position (D) of each numbered liquid level detector 2 by decoding the different numbered information of the signal, receiving and recording time (t 2), measuring the drop time difference t=t2-t 1, and calculating and defining the acceleration change value when passing through the different shaped well sections in advance L ) Until the liquid level detector 2 is immersed into the liquid level, the signal is interrupted, and the host 1 displays the final real-time position of the liquid level detector 2, namely the current liquid level position;
6. and analyzing the dynamic change of the current liquid level position according to the ratio of the depth difference to the time difference of the two adjacent numbered liquid level detectors 2.
It should be noted that fig. 1 is only one configuration of a wellbore fluid level detection device according to the present invention, and the components thereof, particularly the detector mounting device, have various practical configurations, which is not meant to limit the scope of the present invention to the specific configuration shown in fig. 1.
As described above, the present invention can be preferably implemented.
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The foregoing description of the preferred embodiment of the invention is not intended to limit the invention in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The method for detecting the liquid level of the shaft is characterized by comprising a shaft liquid level detection device, wherein the shaft liquid level detection device comprises a host machine (1), a liquid level detector (2) and a detector mounting device (3), the detector mounting device (3) can enable the liquid level detector (2) to be in a fixed state or a release state, and the host machine (1) can monitor the position of the liquid level detector (2);
the method comprises the following steps:
s1, operating a detector mounting device (3), releasing the liquid level detector (2), and enabling the liquid level detector (2) to fall in a shaft;
s2, measuring the time of the liquid level detector (2) passing through different well sections;
s3, calculating the liquid level depth in real time by the host machine (1);
step S2 comprises the steps of:
s21, determining the acceleration of the downlink liquid level detector at different well sections according to the designed well track of the liquid level well to be detected: in the vertical well section, the acceleration a of the liquid level detector (2) V Equal to the gravitational acceleration g; in the steady inclined section, the acceleration of the liquid level detector (2) is a H ＝g×(sinθ H -cosθ H X mu) and in the deflecting section, the acceleration of the liquid level detector (2) is a B ＝g×(1+sinθ H -cosθ H X μ)/2; wherein θ H The stable bevel angle is designed for the well to be tested, and mu is the friction coefficient between the liquid level detector (2) and the well wall;
s22, calculating the length L of the straight well section passing through the free falling body descending liquid level detector at the well head V Length L of deflecting section B Length of steady inclined section L H The time of (c) is sequentially denoted as t V 、t B 、t H The calculation formula is as follows:
2. the method according to claim 1, wherein in step S3, the time from releasing the liquid level detector (2) to stopping emitting the working signal is recorded as t, and the liquid level depth is calculated in real time, and the calculation formula is:
when t is less than or equal to t V In the time-course of which the first and second contact surfaces,
D L ＝g×t 2 /2；
when t V ＜t≤(t B +t V ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t-t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t-t V ) 2 /2]；
when (t) V +t B )＜t≤(t V +t B +t H ) In the time-course of which the first and second contact surfaces,
D L ＝g×t V 2 /2+[g×t V ×(t B +t V )+g×(1+sinθ H -cosθ H ×μ)/2)×(t B +t V ) 2 /2+[g×t V +t B ×g×(1+sinθ H -cosθ H ×μ)/2]×(t-t B -t V )+g×(sinθ H -cosθ H ×μ)×(t-t B -t V ) 2 /2]。
3. the method of wellbore fluid level detection of claim 2, further comprising the steps of:
s4, calculating the liquid level change speed according to the liquid level depth.
4. A method according to claim 3, characterized in that in step S4, the liquid level is detected by releasing the liquid level detector (2) a plurality of times, and the ratio of the liquid level difference obtained by the two adjacent detections to the time difference is calculated.
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| RU2071596C1 (en) * | 1992-03-03 | 1997-01-10 | Валерий Иванович Федодеев | Method of determination of depth of reservoirs and level of liquid and device for its implementation |
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