CN111380589B - Liquid level measuring device and liquid level measuring method for pressure difference type gas storage - Google Patents
Liquid level measuring device and liquid level measuring method for pressure difference type gas storage Download PDFInfo
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- CN111380589B CN111380589B CN202010232901.9A CN202010232901A CN111380589B CN 111380589 B CN111380589 B CN 111380589B CN 202010232901 A CN202010232901 A CN 202010232901A CN 111380589 B CN111380589 B CN 111380589B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
Abstract
The invention discloses a differential pressure type gas storage liquid level measuring device and a liquid level measuring method, wherein the device comprises a sleeve and a differential pressure sensor; two capillary pipelines are arranged in the cylinder wall of the sleeve from top to bottom; the capillary pipeline comprises two pressure guide pipes and a large bubble cavity, one end of one pressure guide pipe is communicated with the outside of the sleeve and is communicated with the other pressure guide pipe through the large bubble cavity; the other end of the other pressure guide pipe is communicated with the interior of the sleeve; the pressure is transferred through the capillary pipeline, two liquid level pressure points to be measured are led upwards to the same position, the pressure difference is measured by the pressure difference sensor and converted into a liquid level difference, and therefore the liquid level of the gas storage is measured. The pressure difference type gas storage liquid level measuring device provided by the invention is simple in structure, the accuracy of liquid level measurement is improved by arranging the large bubble chamber, and meanwhile, the contact between a pressure difference sensor probe and liquid is avoided, so that the service life of the device is prolonged.
Description
Technical Field
The invention belongs to the technical field of gas storage liquid level measurement, and particularly relates to a pressure difference type gas storage liquid level measurement device and a liquid level measurement method.
Background
The salt cavern gas storage is built by injecting fresh water to store salt mine as a dissolving cavity, and the process is as follows: the pipelines such as a central pipe, a middle pipe, a sleeve and the like are driven downwards through a drilling well; dissolving by injecting fresh water, discharging brine by a drain pipe, and injecting an isolating liquid from a gap between a water injection pipe and a sleeve to avoid dissolving the top; and continuously adjusting parameters according to technical parameters such as brine salinity and the like during the period, and controlling the geometric shape and the volume of the underground cavity to finally obtain the gas storage according with the design requirement. In the process, the liquid level measurement of the gas-liquid interface in the cavity has very important significance. Meanwhile, after the gas storage is built and put into use, strict sealing is required, and a permanent packer is used on a central pipe, so that the conventional wired measurement method which can be used in the building process cannot be used, and the underground environmental conditions are more severe, which makes some conventional measurement methods and devices difficult to meet the precision requirement.
Along with the progress of gas storage technology, the construction of the gas storage needs to be assisted by a more accurate liquid level measuring device, however, most of the currently used liquid level measuring devices are logging devices based on echo ranging, laser ranging and the like. In this regard, echo ranging and laser ranging are critical to the downhole logging environment: the change of the medium outside the well and the vibration of the underground object can cause the accuracy of the echo ranging to be reduced; the laser logging device can also be failed due to the underground medium light return rate and irregular pipe wall. However, since the pressure measurement does not involve the above influence of the external medium, the accuracy of the pressure measurement is improved in the downhole level measurement. Two pressure values must be measured when using pressure logging: the pressure value above the liquid level and the pressure value below the liquid level. And performing difference making to convert the difference into a liquid level difference, and finally obtaining the actual liquid level height.
However, the use of differential pressure type sensors for level measurement also faces great difficulties: although the absolute pressure value in the well is very large (as high as 35Mpa), the pressure difference between two measuring points is very small, which causes huge error in measuring the absolute pressure of two points by using only two pressure sensors in the prior art, which is also the most important challenge faced by the differential pressure based measuring method.
A liquid level measuring device based on a double differential pressure transmitter is disclosed in a chinese invention patent document with an authorization publication number CN 106352942 a. The device has the main advantage that two pressure guide pipes are used for reducing errors caused by uncertain liquid phase density. However, the biggest defect of the device is that when the pressure difference in the pressure guide pipe is measured by adopting a differential pressure transmitter, a transverse measurement method is adopted, the method is effective in measuring the liquid level of a pollution discharge factory, but the method is not feasible when applied to the liquid level measurement of the gas storage, because the space in the central pipe of the gas storage is limited, and a device cannot be additionally arranged outside the pipe for auxiliary measurement; meanwhile, when the liquid level exceeds the estimated liquid level, the device can be directly contacted with external liquid, so that the measurement precision of the device can be interfered, and the service life of the measuring device can be shortened.
Disclosure of Invention
Aiming at the defects and the improvement requirements of the prior art, the invention provides a pressure difference type gas storage liquid level measuring device and a liquid level measuring method, which solve the problems of difficult measurement of the liquid level of the gas storage and low measurement precision by establishing a capillary pipeline with a large bubble chamber to transfer pressure, and simultaneously prolong the service life of the underground liquid level measuring device.
To achieve the above object, according to one aspect of the present invention, there is provided a differential pressure type gas storage tank liquid level measuring apparatus comprising: comprises a sleeve and a differential pressure sensor; a first capillary pipeline and a second capillary pipeline are arranged in the cylinder wall of the sleeve from top to bottom;
the first capillary pipeline comprises a first pressure guide pipe, a first large bubble chamber and a second pressure guide pipe; one end of the first pressure guide pipe is communicated with the outside of the sleeve and is communicated with the second pressure guide pipe through the first large bubble chamber; the other end of the second pressure guide pipe is communicated with the interior of the sleeve;
the second capillary pipeline comprises a third pressure guide pipe, a second large bubble chamber and a fourth pressure guide pipe; one end of the third pressure guide pipe is communicated with the outside of the sleeve and is communicated with the fourth pressure guide pipe through the second large bubble chamber; the other end of the fourth pressure guide pipe is communicated with the interior of the sleeve;
the height difference between the first pressure guide pipe and the third pressure guide pipe is greater than or equal to the difference between the highest liquid level and the lowest liquid level of the gas storage;
and two probes of the differential pressure sensor respectively probe into the second pressure guide pipe and the fourth pressure guide pipe.
Further, the volume of the first large bubble chamber is more than 3 orders of magnitude larger than the volume of the first pressure guide pipe and the volume of the second pressure guide pipe; the volume of the second large bubble chamber is more than 3 orders of magnitude larger than the volume of the third pressure guide pipe and the volume of the fourth pressure guide pipe.
Further, the cross-sectional areas of the first large bubble chamber and the second large bubble chamber are gradually reduced from bottom to top.
Further, the bottom of the first large bubble chamber and the bottom of the first pressure guide pipe are on the same horizontal plane; the bottom of the second large bubble chamber and the bottom of the third pressure guide pipe are on the same horizontal plane.
Furthermore, the sleeve is formed by connecting a plurality of sections of sleeves, and the differential pressure sensor is arranged at the screw thread connection position of the two sleeves.
Further, gaps formed by the two probes of the differential pressure sensor, the second pressure guide pipe and the fourth pressure guide pipe are sealed by high-pressure resistant materials.
The invention also provides a gas storage liquid level measuring method, which comprises the following steps:
placing the liquid level measuring device in the gas storage, enabling the third pressure guide pipe to be at the lowest liquid level of the gas storage, and acquiring the height h of the third pressure guide pipe from the ground1；
Measuring the pressure difference through the pressure difference sensor, and calculating the height delta h of the actual liquid level of the gas storage from the third pressure guiding pipe based on a formula delta P-rho g delta h;
calculating to obtain the height h of the actual liquid level of the gas storage from the ground1-Δh。
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the pressure is transferred by establishing a capillary pipeline with a large bubble chamber in the cylinder wall of the sleeve, two liquid level pressure points to be measured are led upwards to the same position, and then the pressure difference is measured by a pressure difference sensor and converted into a liquid level difference, so that the liquid level of the gas storage is measured, and the liquid level measurement precision is improved.
(2) Due to the existence of the large bubble chamber, when the liquid level of the gas storage exceeds the highest liquid level which can be measured by the device, the liquid immersed into the third pressure pipe cannot be pressed into the fourth pressure pipe, so that the liquid cannot be contacted with the measuring device, and the service life of the device is prolonged; and after the liquid level of the gas storage is reduced, the device can still work normally.
(3) The measuring device provided by the invention is simple in structure and easy to realize.
Drawings
FIG. 1 is a schematic structural view of a pressure-difference type gas storage level measuring device provided by the present invention;
FIG. 2 is a partially enlarged schematic view of the pressure-difference type gas storage level measuring device according to the present invention;
FIGS. 3-1 and 3-2 are schematic views showing the change in liquid level before and after the liquid enters the second capillary during the lowering of the apparatus;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1 is a sleeve; 2 is a differential pressure sensor; 3 is a probe; 4-1 is a first pressure guide pipe; 4-2 is a second pressure guide pipe; 4-3 is a third pressure guide pipe; 4-4 is a fourth pressure guide pipe; 5-1 is a first large bubble chamber; 5-2 is a second large bubble chamber; and 6 is a sleeve wall.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the present invention provides a differential pressure type gas storage liquid level measuring device, which comprises a sleeve 1 and a differential pressure sensor 2;
a first capillary pipeline and a second capillary pipeline are arranged in the cylinder wall of the sleeve 1 from top to bottom;
the first capillary pipeline comprises a first pressure guide pipe 4-1, a first large bubble chamber 5-1 and a second pressure guide pipe 4-2; one end of the first pressure guide pipe 4-1 is communicated with the outside of the sleeve 1, and is communicated with the second pressure guide pipe 4-2 through the first large bubble chamber 5-1; the other end of the second pressure guide pipe 4-2 is communicated with the interior of the sleeve 1;
preferably, the volume of the first large bubble chamber 5-1 is more than 3 orders of magnitude larger than the volumes of the first pressure pipe 4-1 and the second pressure pipe 4-2; so that the liquid entering the first capillary channel can not cause the rapid change of the height of the liquid column, thereby increasing the measurement precision.
Preferably, the cross-sectional area of the first large bubble chamber 5-1 is gradually reduced from bottom to top.
Preferably, the bottom of the first large bubble chamber 5-1 and the bottom of the first pressure guiding pipe 4-1 are on the same horizontal plane.
The second capillary pipeline comprises a third pressure guide pipe 4-3, a second large bubble chamber 5-2 and a fourth pressure guide pipe 4-4; one end of the third pressure guide pipe 4-3 is communicated with the outside of the sleeve 1, and is communicated with the fourth pressure guide pipe 4-4 through the second large bubble chamber 5-2; the other end of the fourth pressure guide pipe 4-4 is communicated with the interior of the sleeve 1;
preferably, the volume of the second large bubble chamber 5-2 is more than 3 orders of magnitude larger than the volume of the third pressure pipe 4-3 and the fourth pressure pipe 4-4; so that the liquid entering the second capillary channel can not cause the rapid change of the height of the liquid column, thereby increasing the measurement precision.
Preferably, the cross-sectional area of the second large bubble chamber 5-2 is gradually reduced from bottom to top.
Preferably, the bottom of the second large bubble chamber 5-2 and the bottom of the third impulse pipe 4-3 are on the same horizontal plane.
The height difference between the first pressure pipe 4-1 and the third pressure pipe 4-3 is greater than or equal to the difference between the highest liquid level and the lowest liquid level of the gas storage;
the two probes 3 of the differential pressure sensor 2 respectively probe into the second pressure guiding pipe 4-2 and the fourth pressure guiding pipe 4-4.
Preferably, the sleeve 1 is formed by connecting a plurality of sections of sleeves, and the differential pressure sensor 2 is installed at the threaded connection part of the two sleeves.
Preferably, the gap formed by the two probes 3 of the differential pressure sensor 2 and the second pressure guide pipe 4-2 and the fourth pressure guide pipe 4-4 is sealed by a high-pressure resistant material.
The measurement principle of the differential pressure type gas storage liquid level measurement device provided by the invention is further explained in detail in combination with the well descending process of the measurement device.
The sleeve with the differential pressure sensor is arranged underground, the two capillary pipelines are filled with high-pressure gas in the gas storage, and the highest pressure is about 35 Mpa. When the third pressure pipe is in contact with the actual liquid level of the gas storage, liquid enters the second capillary pipeline to realize liquid seal, and high-pressure gas is sealed in the second capillary pipeline, as shown in fig. 3, the liquid level change schematic diagram before and after the liquid enters the second capillary pipeline in the process of descending the well of the device is shown. With the increasing of the well descending depth, the external air pressure is increased continuously, so that the volume of the liquid entering the second capillary pipeline is increased continuously; however, due to the existence of the large bubble chamber, under the condition that the height of the liquid column is increased extremely slowly, the pressure of the internal gas is also increased rapidly, and the negative feedback mechanism slows down the speed of the external liquid entering the large bubble chamber, so that the internal and external air pressures are balanced finally. Because the liquid entering the third pressure guide pipe is reduced, the height of the liquid column in the large bubble chamber is extremely small, so that the error in estimating the height of the liquid column is reduced, and the measurement precision is improved.
When the liquid level of the gas storage is higher than the preset highest liquid level, liquid is pressed into the first pressure guide pipe, at the moment, due to the existence of the conical large bubble cavity, the volume of the gas sealed by the liquid is sharply reduced along with the increase of the height of the liquid column entering the first capillary pipeline, the pressure of the gas sealed by the liquid in the first capillary pipeline is sharply increased, and the liquid column entering the first capillary pipeline is adjusted to be very small in height through negative feedback adjustment, so that the liquid is prevented from directly contacting the probe, and the purpose of protecting the device is realized. When the liquid level of the gas storage falls within the measuring range, the device can recover the measurement.
Because the liquid level of the reservoir has the highest liquid level and the lowest liquid level, the liquid level measuring device is arranged in the gas reservoir, so that the third pressure guide pipe is at the lowest liquid level of the gas reservoir, in practical application, negligible errors are allowed to exist, namely the third pressure guide pipe is close to the lowest liquid level of the gas reservoir, and the height h of the third pressure guide pipe from the ground is obtained1I.e. the height of the lowest liquid level from the ground; measuring the pressure difference by said pressure difference sensor based on the formula deltaCalculating the height delta h of the actual liquid level of the gas storage from the third pressure guiding pipe by taking P as rho g delta h; calculating to obtain the height h of the actual liquid level of the gas storage from the ground1-Δh。
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A differential pressure type gas storage liquid level measuring device is characterized by comprising a sleeve (1) and a differential pressure sensor (2);
a first capillary pipeline and a second capillary pipeline are arranged in the wall of the sleeve (1) from top to bottom;
the first capillary pipeline comprises a first pressure guide pipe (4-1), a first large bubble chamber (5-1) and a second pressure guide pipe (4-2); one end of the first pressure guide pipe (4-1) is communicated with the outside of the sleeve (1), and is communicated with the second pressure guide pipe (4-2) through the first large bubble chamber (5-1); the other end of the second pressure guide pipe (4-2) is communicated with the interior of the sleeve (1);
the second capillary pipeline comprises a third pressure guide pipe (4-3), a second large bubble chamber (5-2) and a fourth pressure guide pipe (4-4); one end of the third pressure guide pipe (4-3) is communicated with the outside of the sleeve (1), and is communicated with the fourth pressure guide pipe (4-4) through the second large bubble chamber (5-2); the other end of the fourth pressure guide pipe (4-4) is communicated with the interior of the sleeve (1);
the volume of the first large bubble chamber (5-1) is more than 3 orders of magnitude larger than the volume of the first pressure guide pipe (4-1) and the second pressure guide pipe (4-2); the volume of the second large bubble chamber (5-2) is more than 3 orders of magnitude larger than the volume of the third pressure guide pipe (4-3) and the fourth pressure guide pipe (4-4);
the cross-sectional areas of the first large bubble chamber (5-1) and the second large bubble chamber (5-2) are gradually reduced from bottom to top;
the elevation difference between the first pressure guide pipe (4-1) and the third pressure guide pipe (4-3) is greater than or equal to the difference between the highest liquid level and the lowest liquid level of the gas storage;
two probes (3) of the differential pressure sensor (2) respectively probe into the second pressure guide pipe (4-2) and the fourth pressure guide pipe (4-4).
2. The pressure-differential gas storage tank liquid level measuring device according to claim 1,
the bottom of the first large bubble chamber (5-1) and the bottom of the first pressure guide pipe (4-1) are on the same horizontal plane;
the bottom of the second large bubble chamber (5-2) and the bottom of the third pressure guide pipe (4-3) are on the same horizontal plane.
3. The pressure-differential gas storage tank liquid level measuring device according to claim 1,
the sleeve (1) is formed by connecting a plurality of sections of sleeves, and the differential pressure sensor (2) is arranged at the connection position of the screw threads of the two sleeves.
4. The pressure-differential gas storage tank liquid level measuring device according to claim 1,
gaps formed by the two probes (3) of the differential pressure sensor (2) and the second pressure guide pipe (4-2) and the fourth pressure guide pipe (4-4) are sealed by high-pressure-resistant materials.
5. A gas storage tank liquid level measuring method using the pressure-difference type gas storage tank liquid level measuring device according to any one of claims 1 to 4, characterized by comprising the steps of:
placing the liquid level measuring device in the gas storage, enabling the third pressure guide pipe (4-3) to be at the lowest liquid level of the gas storage, and obtaining the height h of the third pressure guide pipe (4-3) from the ground1；
Measuring the pressure difference through the differential pressure sensor (2), and calculating the height delta h between the actual liquid level of the gas storage and the third pressure guide pipe (4-3) based on a formula delta P ═ rho g delta h;
calculating to obtain the actual liquid level of the gas storageH is the height h from the ground1-Δh。
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