CA2627814A1 - Multiphase-liquid level data logger - Google Patents
Multiphase-liquid level data logger Download PDFInfo
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- CA2627814A1 CA2627814A1 CA002627814A CA2627814A CA2627814A1 CA 2627814 A1 CA2627814 A1 CA 2627814A1 CA 002627814 A CA002627814 A CA 002627814A CA 2627814 A CA2627814 A CA 2627814A CA 2627814 A1 CA2627814 A1 CA 2627814A1
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- 239000007788 liquid Substances 0.000 title claims abstract description 167
- 239000012071 phase Substances 0.000 claims description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 235000014676 Phragmites communis Nutrition 0.000 claims description 15
- 230000005484 gravity Effects 0.000 claims description 11
- 239000008346 aqueous phase Substances 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 2
- 230000001747 exhibiting effect Effects 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- G01F23/0038—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 using buoyant probes
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- General Physics & Mathematics (AREA)
- Level Indicators Using A Float (AREA)
Abstract
A multiphase-liquid level sensing system for sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different second phase includes an elongated stem that defines an elongated cavity. A float, which exhibits a sensible property, is disposed coaxially around the elongated stem and has negative buoyancy relative to the liquid of the first phase and positive buoyancy relative to the liquid of the second phase. A level sensor senses the sensible property and indicates a second phase liquid distance from the float to the bottom of the stem. An overburden sensor extends downwardly from the stem senses total liquid thickness of the liquid above the overburden sensor. A computational circuit calculates a layer depth and thickness of the liquid of the first phase, based on input from the level sensor and the overburden sensor.
Description
2
3 BACKGROUND OF THE INVENTION
4 [0001] Field of the Invention 7 [0002] The present invention relates to sensor systems and, more specifically, to a sensor 8 system that senses the thickness of layers of liquids of different phases.
[0003] Description of the Prior Art 12 [0004] It is important to measure multiphase fluid levels in a variety of settings such as 13 containers, drums, tanks, wells, rivers, oceans, and other surface and subsurface environments.
14 Multiphase fluids are composed of liquids of different specific gravities such as light non-aqueous phase liquid (LNAPL), water, dense non-aqueous phase liquid (DNAPL), and 16 emulsions. LNAPL is characterized by having a specific gravity less than that of water and 17 DNAPL is characterized by having a specific gravity greater than that of water.
19 [0005] Current systems for measuring multiphase fluid levels include systems that use pressure transducers, optical sensors, float switches, ultrasonic sensors, magneto-restrictive, 21 magneto-elastic, radar (pulse burst, guided-wave, frequency modulated continuous wave, and 22 other radar-based technologies ), radio frequency (RF), and related devices which are capable of 23 measuring the level of a single phase liquid.
[0006] None of these devices are capable of measuring levels of several multiphase liquids 26 simultaneously. Although two or more devices can be applied to measure the levels of 27 multiphase liquids separately, none of the devices are capable of automatically computing and 28 reporting the thicknesses of multiphase liquids or the elevations of multiphase liquids, 29 simultaneously.
21750433.1 1 [0007] The space available to install multiple devices to measure multiphase liquids may be 2 restricted by the narrow spaces of the container being measured. For example, a tank may not 3 have a sufficient number of ports to accommodate more than one device, or a single available 4 port might not be large enough to accommodate multiple devices. In measuring multiphase liquid levels in a well, the space within the well is generally too restricted to accommodate 6 several different devices at the same time. Furthermore, it may not be possible to deploy other 7 down-hole devices such as pumping systems or other recovery apparatus in small diameter wells.
9 [0008] Therefore, there is a need for a system that can sense the levels of different liquid phases simultaneously.
14 [0009] The disadvantages of the prior art are overcome by the present invention which, in one aspect, is a multiphase-liquid level sensing system for sensing a layer depth and thickness of 16 a liquid of a first phase that floats on a liquid of a different second phase. An elongated stem has 17 a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom 18 retainer disposed adjacent the bottom end. The elongated stem defines an elongated cavity 19 therein. A first float is disposed coaxially around the elongated stem. A
portion of the first float exhibits a sensible property. The first float has a negative buoyancy relative to the liquid of the 21 first phase and a positive buoyancy relative to the liquid of the second phase. A level sensor is 22 disposed within the cavity defined by the elongated stem. The level sensor senses the sensible 23 property of the portion of the first float. The level sensor is configured to indicate a second 24 phase liquid distance from the first float to the bottom end of the stem based on where the sensible property is sensed on the level sensor. An overburden sensor extends downwardly from 26 the bottom end of the stem. The overburden sensor is configured to sense a property indicative 27 of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above 28 the overburden sensor. A depth indicator indicates a depth of the overburden sensor relative to a 29 predetermined point. A computational circuit calculates a layer depth and thickness of the liquid of the first phase, based on a first signal from the level sensor, a second signal from the 31 overburden sensor and the depth of the overburden sensor.
21750433.1 2 2 [0010] In another aspect, the invention is a multiphase-liquid level sensing system for 3 sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different 4 second phase. An elongated stem has a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom end disposed adjacent the bottom end. The elongated 6 stem defines an elongated cavity therein. A first float is disposed coaxially around the elongated 7 stem. The first float includes an annular floatation member having a top end and an opposite 8 bottom end and a magnet that is affixed to the annular floatation member.
The magnet is 9 configured to generate a sensible magnetic field. The first float has a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase.
i l A plurality of spaced-apart reed switches is disposed within the cavity defined by the elongated 12 stem the level sensor. Each reed switch is capable of switching from a first state to a different 13 second state when subjected to a magnetic field so as to indicate a position of the second float, 14 thereby indicating a second phase liquid distance from the first float to the bottom end of the stem. A pressure transducer extends downwardly from the bottom end of the stem. The pressure 16 transducer is configured to sense a pressure indicative of a total liquid thickness of the liquid of 17 the first phase and the liquid of the second phase above the pressure transducer. A depth 18 indicator indicates a depth of the pressure transducer relative to a predetermined point. A
19 computational circuit calculates a layer depth and thickness of the liquid of the first phase. The computational circuit is responsive to a first signal from the level sensor, a second signal from 21 the pressure transducer and the depth of the pressure transducer.
23 [0011] In yet another aspect, the invention is a method of determining a thickness and a 24 depth of a layer of a liquid of a first phase that is floating on a layer of a liquid of a different second phase, in which a first depth of a portion of a sensor that is placed in the liquid of the 26 second phase is detected. A total liquid thickness between the sensor and the top of the layer of 27 liquid of the first phase is detected. A first distance from the portion of the sensor to an interface 28 between the liquid of the first phase and the liquid of the second phase is detected. The thickness 29 of the layer of the liquid of the first phase is calculated by subtracting the first distance from the total liquid thickness.
21750433.1 3 1 [0012] These and other aspects of the invention will become apparent from the following 2 description of the preferred embodiments taken in conjunction with the following drawings. As 3 would be obvious to one skilled in the art, many variations and modifications of the invention 4 may be effected without departing from the spirit and scope of the novel concepts of the disclosure.
9 [0013] FIG.1A is a schematic diagram of a multiphase-liquid level sensing system.
11 [0014] FIG. 1B is a schematic diagram of a multiphase-liquid level sensing system 12 employed to measure levels in a well.
14 [0015] FIG. 1C is a schematic diagram of a multiphase-liquid level sensing system used to measure levels in a well that is adjacent to another well.
17 [0016] FIG. 2 is a schematic diagram of a one float multiphase-liquid level sensing system 18 for sensing a LNAPL and water layer thicknesses.
[0017] FIG. 3 is a schematic diagram of a one float multiphase-liquid level sensing system 21 for sensing a DNAPL and water layer thicknesses.
23 [0018] FIG. 4 is a schematic diagram of a two float multiphase-liquid level sensing system.
[0019] FIG. 5 is a schematic diagram of a three float multiphase-liquid level sensing system.
27 [0020] FIGS. 6A and 6B are schematic diagrams of a split stem.
21750433.1 4 3 [0021] A preferred embodiment of the invention is now described in detail.
Referring to the 4 drawings, like numbers indicate like parts throughout the views. As used in the description herein and throughout the claims, the following terms take the meanings explicitly associated 6 herein, unless the context clearly dictates otherwise: the meaning of "a,"
"an," and "the" includes 7 plural reference, the meaning of "in" includes "in" and "on." Also, as used herein, "phase"
8 refers to the relationship of one liquid to another liquid based on their respective specific 9 gravities.
11 [0022] As shown in FIG. 1, one embodiment includes a multiphase-liquid level sensing 12 system 100 for sensing a layer depth and thickness of a liquid of a first phase that floats on a 13 liquid of a different second phase. The sensing system 100 includes a sensor unit 110 that is 14 remotely coupled to an electronics enclosure 122 (such as a digital computer or an analog computing system) via a communications channel 120 (which, in one embodiment, includes a 16 shielded composite electrical cable). The sensor unit 110 includes an elongated composite stem 17 112 that has a top end 117 and an opposite bottom end 115. A top retainer 118 is disposed 18 adjacent the top end 117 and a bottom retainer 116 disposed adjacent the bottom end 115. The 19 elongated stem 112 defines an elongated cavity 113 into which is placed a level sensor 111, such as a sequence of spaced apart reed switches. Magnetorestrictive, other magnetic field dependant 21 technologies and other non-magnetic technologies can be used as an alternative to reed-switches.
23 [0023] A first float 130 is disposed coaxially around the elongated stem 112. The float 24 includes an annular flotation member 132 that has a top end and an opposite bottom end.
Affixed to either the top end or the bottom end is an element 134 that exhibits a property that is 26 sensible by the level sensor 111. For example the element 134 could be a magnet that generates 27 a magnetic field. When the level sensor 111 includes a series of reed switches, the magnetic 28 field would cause the reed switch closest to the magnet to close while all of the other reed 29 switches would remain open (or vise versa). Since the position of each of the reed switches is know, changing the state of the reed switch that is in the state that indicates juxtaposition with 31 the magnet would indicate the level of the float 130 relative to the elongated stem 112. The 21750433.1 5 1 floatation member 132 and the element 134 together cause the float 130 to have a buoyancy that 2 would cause it to float at an interface of two different liquids. For example, if the float 130 had a 3 negative buoyancy relative to a liquid of a first phase and a positive buoyancy relative to a liquid 4 of a second phase, then the float 130 would float at the interface between the two liquids, and the position of the float 130 would indicate the level of the interface.
7 [0024] When the float 130 is used in conjunction with reed-switch based technology, a series 8 of multi-tiered sequential reed switches may be positioned within the hermitically sealed 9 transmitter housed in the non-magnetic composite stem 112. The switches are connected via a shielded composite cable 120 to the electronics enclosure 122. A regulated direct current (DC) is 11 applied to a voltage divider which extends the full length of the transmitter. As the float 130 12 with a magnetic sleeve 134 moves up and down, the corresponding switches are magnetically 13 actuated to open or close in sequence thus tapping off the next higher or lower voltage. It is 14 therefore possible to locate continually the position of the float 130 by measuring the voltage which is transmitted to the electronics enclosure 122.
17 [0025] The composite stem houses both a sealed transmitter composed of a series of reed 18 switches used for measuring the position of the float as well as a set of wires in a shielded 19 composite cable that convey the pressure readings from the transducer. A
shield will separate any noise between the transducer and the reed switches.
22 [0026] An overburden sensor 114 extends downwardly from the bottom end 115 of the stem 23 112. The overburden sensor 114 could be, for example, a pressure transducer and is capable of 24 sense a property that indicates a total liquid thickness of liquid above the overburden sensor 114.
For example, if the overburden sensor 114 is a pressure transducer, then the pressure it senses 26 would be directly proportional to the amount of liquid above the pressure transducer. One 27 example of a suitable pressure transducer is a submersible pressure transducer, Model No. PXD.
28 261, available from Insitu Inc. 221 East Lincoln Avenue, Ft. Collins, CO
80524.
21750433.1 6 1 [0027] The electronics enclosure 122, which includes a computational circuit (such as a 2 digital computer or an analog computer), calculates the layer thickness of the liquid above the 3 float 130 based on a signal from the level sensor 111 and the overburden sensor 114.
[0028] A depth indicator can indicate a depth of the overburden sensor relative to a 6 predetermined point. The depth indicator could simply be a device that measures the length of 7 the cable 120 that has been played out in lowering the sensor unit 110. With a knowledge of the 8 depth of the sensor unit 110, the sensing system 100 can determine both the layer depth and layer 9 thickness of the liquid above the float 130.
11 [0029] The sensing system 100 can be used to detect layer depths of different liquid phases 12 in such things as tanks, sumps, wells, reservoirs, lakes, rivers and many other things that store 13 liquids of more than one liquid phase together. For example, as shown in FIG. 1 B, the sensing 14 system 100 may be used to detect the layer depth and thickness of a LNAPL
layer 220 (such as an oil layer) that is floating on a water layer 210 in a well 200. The sensing system 100 can be 16 used in concert with a pump 202 to insure that the pump intake 204 does not extend into the 17 water layer 210. The sensing system 100 allows real-time monitoring of LNAPL layer 220 depth 18 as the LNAPL is being pumped out. Since the water layer 210 level may rise as the LNAPL is 19 being pumped out due to the removal of the overburdening weight of the LNAPL, the sensing system 100 can prevent over pumping of the well 200. This can be especially important because 21 if the water layer 210 extends into the pores from which LNAPL flows into the well 200, the 22 water can block the pores, thereby reducing the capacity of the well.
24 [0030] As shown in FIG. 1 C, certain pumping systems 234 do not accommodate placement of the sensing system 100 in the same well 232 that is being pumped. However, the sensing 26 system 100 can still monitor the layer thickness and depth in the wel1232 by being placed in an 27 adjacent well 230.
29 [0031] Calculation of the layer thicknesses is demonstrated as follows, with referenced to FIG. 2. At predetermined intervals, the transducer 114 measures the differential pressure ("PA") 31 (apparent pressure) exerted by the fluids 210 and 220 present above the transducer 114. This 21750433.1 7 1 data is used to compute the apparent height ("HA") of the fluids 210 and 220. Since the 2 transducer is unable to distinguish between the multi-phase liquids present above the transducer, 3 the true height of the multiphase fluid "H" must be determined by further computations.
[0032] The data from the level sensor 111 and the transducer 114 is further processed to 6 calculate elevations and thicknesses of multiphase liquids. The distance between the float switch 7 and the transducer establishes the true height "hW" of water above the transducer 114. The 8 LNAPL layer height ("hL") above the water layer is calculated as follows:
First, the pressure 9 exerted by the water (PW) above the transducer is deducted from hW as follows. Given that pressure of 1 psi = 2.307 feet of water, PW =hW / 2.307. The additional pressure exerted by the 11 LNAPL (PL) is PL=PA-PW. Then, the thickness of LNAPL layer 220 floating on the water 12 surface is hL= PL * 2.307* SGL, where SGL = specific gravity of the LNAPL.
(This can be 13 determined by sampling the LNAPL and determining its specific gravity using well know 14 methods.) Then, the true height of the multiphase liquid above the transducer, H=hL+ hW. The height "H" can be referenced to the transducer elevation, an arbitrary elevation, or an elevation 16 referenced to mean sea level (MSL), or any other reference elevations to compute the true datum 17 of the liquid level measured by the transducer.
19 [0033] In certain embodiments, the sensing system 100 may be used to measure the thickness of a water layer above a DNAPL layer. In such an embodiment, as shown in FIG.
3, a float 330 21 that is negatively buoyant in water and positively buoyant in DNAPL is used.
23 [0034] The distance between the float switch and the transducer establishes the true height 24 "hD" of DNAPL above the transducer. The height "hW" of the water above the water-DNAPL
interface is calculated as follows: First, pressure at 1 psi = 2.307 feet of water and, therefore, 26 PW =hW / 2.307. The pressure exerted by the DNAPL layer is first computed according to the 27 following formula: PD= SGD x (hD / 2.307), where SGD=Specific gravity of the DNAPL. The 28 additional pressure exerted by the water above the water-DNAPL interface is computed as 29 follows: PW = PA - PD. The thickness of water above the water-DNAPL
interface is computed as follows: hW= PW * 2.307. The true height of the multiphase liquid above the transducer, 31 H=hL+hw. As mentioned above, the height "H" can be referenced to the transducer elevation, an 21750433.1 8 1 arbitrary elevation, or an elevation referenced to mean sea level (MSL), or any other reference 2 elevations to compute the true datum of the liquid level measured by the transducer.
4 [0035] As shown in FIG. 4, a second float 430 may be employed to enable the system to measure relatively thin layers with a high level of precision. This system employs a first float 6 430 and a second float 440. The first float 430 can be cup-shaped and define an open portion 7 432 that is complementary in shape to the second float 440. The first float 430 defines at least 8 one passage 434 passing downwardly therethrough so as to allow liquid to drain out of the open 9 portion 432. Thus, as the LNAPL layer thins, the second float 440 can fit into the open portion 432 so as to give a precise indication of the thickness of the LNAPL layer.
The passage 434 (or 11 passages) may be embodied with perforations or as a screen. Also, the passage 434 can be either 12 on the bottom as shown, or extending radially from the side of the float 430. The passage 434 13 allows the second float 440 to seat into the first float 430 without entrapping liquid within the 14 open portion 432.
16 [0036] A three float embodiment, as shown in FIG. 5, allows precise measurement of the 17 thickness of two layers in a multi-layer environment (for example one in which a water layer is 18 above a DNAPL layer and a LNAPL layer is above the water layer). This embodiment adds a 19 third float 330 having a buoyancy that is negative in water and positive in DNAPL. Addition of a transducer (not shown) at the bottom of the stem 112 would allow the layer thickness 21 monitoring of an additional layer above the LNAPL layer.
23 [0037] The range of measurement for all of the versions discussed above can be extended by 24 adding additional lengths of stem. As shown in FIGS. 6A and 6B, the stem 112 can be lengthened as much as desired with a split stem adapter 900, which includes a first section 912 26 and a complimentary second section 914. Standard temperature, barometric correction, and 27 clock functions can be added to the stem adapter 900 as needed. Apart from traditional line 28 power, the system 100 can be powered by various sources of electricity.
Also, a small battery 29 power supply (not shown) can be integrated into the stem 112 to store data for retrieval at a later time. Direct-read cable can be utilized to transmit real time data to a remote receiver or 21750433.1 9 1 wirelessly transmitted to a remote receiver. The stem 112 can be composed of either solid or 2 flex pipe.
4 [0038] Since numerous configurations with different sensing devices are possible, many different mechanical constructions and arrangements of the apparatus are possible. The system 6 may be provided with a protective sleeve to prevent entanglement with other devices that may be 7 deployed adjacent to the device. The system provides continuous real time observations of the 8 liquid levels and the thicknesses at predetermined intervals.
[0039] The above described embodiments, while including the preferred embodiment and the 11 best mode of the invention known to the inventor at the time of filing, are given as illustrative 12 examples only. It will be readily appreciated that many deviations may be made from the 13 specific embodiments disclosed in this specification without departing from the spirit and scope 14 of the invention. Accordingly, the scope of the invention is to be determined by the claims below rather than being limited to the specifically described embodiments above.
21750433.1 10
[0003] Description of the Prior Art 12 [0004] It is important to measure multiphase fluid levels in a variety of settings such as 13 containers, drums, tanks, wells, rivers, oceans, and other surface and subsurface environments.
14 Multiphase fluids are composed of liquids of different specific gravities such as light non-aqueous phase liquid (LNAPL), water, dense non-aqueous phase liquid (DNAPL), and 16 emulsions. LNAPL is characterized by having a specific gravity less than that of water and 17 DNAPL is characterized by having a specific gravity greater than that of water.
19 [0005] Current systems for measuring multiphase fluid levels include systems that use pressure transducers, optical sensors, float switches, ultrasonic sensors, magneto-restrictive, 21 magneto-elastic, radar (pulse burst, guided-wave, frequency modulated continuous wave, and 22 other radar-based technologies ), radio frequency (RF), and related devices which are capable of 23 measuring the level of a single phase liquid.
[0006] None of these devices are capable of measuring levels of several multiphase liquids 26 simultaneously. Although two or more devices can be applied to measure the levels of 27 multiphase liquids separately, none of the devices are capable of automatically computing and 28 reporting the thicknesses of multiphase liquids or the elevations of multiphase liquids, 29 simultaneously.
21750433.1 1 [0007] The space available to install multiple devices to measure multiphase liquids may be 2 restricted by the narrow spaces of the container being measured. For example, a tank may not 3 have a sufficient number of ports to accommodate more than one device, or a single available 4 port might not be large enough to accommodate multiple devices. In measuring multiphase liquid levels in a well, the space within the well is generally too restricted to accommodate 6 several different devices at the same time. Furthermore, it may not be possible to deploy other 7 down-hole devices such as pumping systems or other recovery apparatus in small diameter wells.
9 [0008] Therefore, there is a need for a system that can sense the levels of different liquid phases simultaneously.
14 [0009] The disadvantages of the prior art are overcome by the present invention which, in one aspect, is a multiphase-liquid level sensing system for sensing a layer depth and thickness of 16 a liquid of a first phase that floats on a liquid of a different second phase. An elongated stem has 17 a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom 18 retainer disposed adjacent the bottom end. The elongated stem defines an elongated cavity 19 therein. A first float is disposed coaxially around the elongated stem. A
portion of the first float exhibits a sensible property. The first float has a negative buoyancy relative to the liquid of the 21 first phase and a positive buoyancy relative to the liquid of the second phase. A level sensor is 22 disposed within the cavity defined by the elongated stem. The level sensor senses the sensible 23 property of the portion of the first float. The level sensor is configured to indicate a second 24 phase liquid distance from the first float to the bottom end of the stem based on where the sensible property is sensed on the level sensor. An overburden sensor extends downwardly from 26 the bottom end of the stem. The overburden sensor is configured to sense a property indicative 27 of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above 28 the overburden sensor. A depth indicator indicates a depth of the overburden sensor relative to a 29 predetermined point. A computational circuit calculates a layer depth and thickness of the liquid of the first phase, based on a first signal from the level sensor, a second signal from the 31 overburden sensor and the depth of the overburden sensor.
21750433.1 2 2 [0010] In another aspect, the invention is a multiphase-liquid level sensing system for 3 sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different 4 second phase. An elongated stem has a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom end disposed adjacent the bottom end. The elongated 6 stem defines an elongated cavity therein. A first float is disposed coaxially around the elongated 7 stem. The first float includes an annular floatation member having a top end and an opposite 8 bottom end and a magnet that is affixed to the annular floatation member.
The magnet is 9 configured to generate a sensible magnetic field. The first float has a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase.
i l A plurality of spaced-apart reed switches is disposed within the cavity defined by the elongated 12 stem the level sensor. Each reed switch is capable of switching from a first state to a different 13 second state when subjected to a magnetic field so as to indicate a position of the second float, 14 thereby indicating a second phase liquid distance from the first float to the bottom end of the stem. A pressure transducer extends downwardly from the bottom end of the stem. The pressure 16 transducer is configured to sense a pressure indicative of a total liquid thickness of the liquid of 17 the first phase and the liquid of the second phase above the pressure transducer. A depth 18 indicator indicates a depth of the pressure transducer relative to a predetermined point. A
19 computational circuit calculates a layer depth and thickness of the liquid of the first phase. The computational circuit is responsive to a first signal from the level sensor, a second signal from 21 the pressure transducer and the depth of the pressure transducer.
23 [0011] In yet another aspect, the invention is a method of determining a thickness and a 24 depth of a layer of a liquid of a first phase that is floating on a layer of a liquid of a different second phase, in which a first depth of a portion of a sensor that is placed in the liquid of the 26 second phase is detected. A total liquid thickness between the sensor and the top of the layer of 27 liquid of the first phase is detected. A first distance from the portion of the sensor to an interface 28 between the liquid of the first phase and the liquid of the second phase is detected. The thickness 29 of the layer of the liquid of the first phase is calculated by subtracting the first distance from the total liquid thickness.
21750433.1 3 1 [0012] These and other aspects of the invention will become apparent from the following 2 description of the preferred embodiments taken in conjunction with the following drawings. As 3 would be obvious to one skilled in the art, many variations and modifications of the invention 4 may be effected without departing from the spirit and scope of the novel concepts of the disclosure.
9 [0013] FIG.1A is a schematic diagram of a multiphase-liquid level sensing system.
11 [0014] FIG. 1B is a schematic diagram of a multiphase-liquid level sensing system 12 employed to measure levels in a well.
14 [0015] FIG. 1C is a schematic diagram of a multiphase-liquid level sensing system used to measure levels in a well that is adjacent to another well.
17 [0016] FIG. 2 is a schematic diagram of a one float multiphase-liquid level sensing system 18 for sensing a LNAPL and water layer thicknesses.
[0017] FIG. 3 is a schematic diagram of a one float multiphase-liquid level sensing system 21 for sensing a DNAPL and water layer thicknesses.
23 [0018] FIG. 4 is a schematic diagram of a two float multiphase-liquid level sensing system.
[0019] FIG. 5 is a schematic diagram of a three float multiphase-liquid level sensing system.
27 [0020] FIGS. 6A and 6B are schematic diagrams of a split stem.
21750433.1 4 3 [0021] A preferred embodiment of the invention is now described in detail.
Referring to the 4 drawings, like numbers indicate like parts throughout the views. As used in the description herein and throughout the claims, the following terms take the meanings explicitly associated 6 herein, unless the context clearly dictates otherwise: the meaning of "a,"
"an," and "the" includes 7 plural reference, the meaning of "in" includes "in" and "on." Also, as used herein, "phase"
8 refers to the relationship of one liquid to another liquid based on their respective specific 9 gravities.
11 [0022] As shown in FIG. 1, one embodiment includes a multiphase-liquid level sensing 12 system 100 for sensing a layer depth and thickness of a liquid of a first phase that floats on a 13 liquid of a different second phase. The sensing system 100 includes a sensor unit 110 that is 14 remotely coupled to an electronics enclosure 122 (such as a digital computer or an analog computing system) via a communications channel 120 (which, in one embodiment, includes a 16 shielded composite electrical cable). The sensor unit 110 includes an elongated composite stem 17 112 that has a top end 117 and an opposite bottom end 115. A top retainer 118 is disposed 18 adjacent the top end 117 and a bottom retainer 116 disposed adjacent the bottom end 115. The 19 elongated stem 112 defines an elongated cavity 113 into which is placed a level sensor 111, such as a sequence of spaced apart reed switches. Magnetorestrictive, other magnetic field dependant 21 technologies and other non-magnetic technologies can be used as an alternative to reed-switches.
23 [0023] A first float 130 is disposed coaxially around the elongated stem 112. The float 24 includes an annular flotation member 132 that has a top end and an opposite bottom end.
Affixed to either the top end or the bottom end is an element 134 that exhibits a property that is 26 sensible by the level sensor 111. For example the element 134 could be a magnet that generates 27 a magnetic field. When the level sensor 111 includes a series of reed switches, the magnetic 28 field would cause the reed switch closest to the magnet to close while all of the other reed 29 switches would remain open (or vise versa). Since the position of each of the reed switches is know, changing the state of the reed switch that is in the state that indicates juxtaposition with 31 the magnet would indicate the level of the float 130 relative to the elongated stem 112. The 21750433.1 5 1 floatation member 132 and the element 134 together cause the float 130 to have a buoyancy that 2 would cause it to float at an interface of two different liquids. For example, if the float 130 had a 3 negative buoyancy relative to a liquid of a first phase and a positive buoyancy relative to a liquid 4 of a second phase, then the float 130 would float at the interface between the two liquids, and the position of the float 130 would indicate the level of the interface.
7 [0024] When the float 130 is used in conjunction with reed-switch based technology, a series 8 of multi-tiered sequential reed switches may be positioned within the hermitically sealed 9 transmitter housed in the non-magnetic composite stem 112. The switches are connected via a shielded composite cable 120 to the electronics enclosure 122. A regulated direct current (DC) is 11 applied to a voltage divider which extends the full length of the transmitter. As the float 130 12 with a magnetic sleeve 134 moves up and down, the corresponding switches are magnetically 13 actuated to open or close in sequence thus tapping off the next higher or lower voltage. It is 14 therefore possible to locate continually the position of the float 130 by measuring the voltage which is transmitted to the electronics enclosure 122.
17 [0025] The composite stem houses both a sealed transmitter composed of a series of reed 18 switches used for measuring the position of the float as well as a set of wires in a shielded 19 composite cable that convey the pressure readings from the transducer. A
shield will separate any noise between the transducer and the reed switches.
22 [0026] An overburden sensor 114 extends downwardly from the bottom end 115 of the stem 23 112. The overburden sensor 114 could be, for example, a pressure transducer and is capable of 24 sense a property that indicates a total liquid thickness of liquid above the overburden sensor 114.
For example, if the overburden sensor 114 is a pressure transducer, then the pressure it senses 26 would be directly proportional to the amount of liquid above the pressure transducer. One 27 example of a suitable pressure transducer is a submersible pressure transducer, Model No. PXD.
28 261, available from Insitu Inc. 221 East Lincoln Avenue, Ft. Collins, CO
80524.
21750433.1 6 1 [0027] The electronics enclosure 122, which includes a computational circuit (such as a 2 digital computer or an analog computer), calculates the layer thickness of the liquid above the 3 float 130 based on a signal from the level sensor 111 and the overburden sensor 114.
[0028] A depth indicator can indicate a depth of the overburden sensor relative to a 6 predetermined point. The depth indicator could simply be a device that measures the length of 7 the cable 120 that has been played out in lowering the sensor unit 110. With a knowledge of the 8 depth of the sensor unit 110, the sensing system 100 can determine both the layer depth and layer 9 thickness of the liquid above the float 130.
11 [0029] The sensing system 100 can be used to detect layer depths of different liquid phases 12 in such things as tanks, sumps, wells, reservoirs, lakes, rivers and many other things that store 13 liquids of more than one liquid phase together. For example, as shown in FIG. 1 B, the sensing 14 system 100 may be used to detect the layer depth and thickness of a LNAPL
layer 220 (such as an oil layer) that is floating on a water layer 210 in a well 200. The sensing system 100 can be 16 used in concert with a pump 202 to insure that the pump intake 204 does not extend into the 17 water layer 210. The sensing system 100 allows real-time monitoring of LNAPL layer 220 depth 18 as the LNAPL is being pumped out. Since the water layer 210 level may rise as the LNAPL is 19 being pumped out due to the removal of the overburdening weight of the LNAPL, the sensing system 100 can prevent over pumping of the well 200. This can be especially important because 21 if the water layer 210 extends into the pores from which LNAPL flows into the well 200, the 22 water can block the pores, thereby reducing the capacity of the well.
24 [0030] As shown in FIG. 1 C, certain pumping systems 234 do not accommodate placement of the sensing system 100 in the same well 232 that is being pumped. However, the sensing 26 system 100 can still monitor the layer thickness and depth in the wel1232 by being placed in an 27 adjacent well 230.
29 [0031] Calculation of the layer thicknesses is demonstrated as follows, with referenced to FIG. 2. At predetermined intervals, the transducer 114 measures the differential pressure ("PA") 31 (apparent pressure) exerted by the fluids 210 and 220 present above the transducer 114. This 21750433.1 7 1 data is used to compute the apparent height ("HA") of the fluids 210 and 220. Since the 2 transducer is unable to distinguish between the multi-phase liquids present above the transducer, 3 the true height of the multiphase fluid "H" must be determined by further computations.
[0032] The data from the level sensor 111 and the transducer 114 is further processed to 6 calculate elevations and thicknesses of multiphase liquids. The distance between the float switch 7 and the transducer establishes the true height "hW" of water above the transducer 114. The 8 LNAPL layer height ("hL") above the water layer is calculated as follows:
First, the pressure 9 exerted by the water (PW) above the transducer is deducted from hW as follows. Given that pressure of 1 psi = 2.307 feet of water, PW =hW / 2.307. The additional pressure exerted by the 11 LNAPL (PL) is PL=PA-PW. Then, the thickness of LNAPL layer 220 floating on the water 12 surface is hL= PL * 2.307* SGL, where SGL = specific gravity of the LNAPL.
(This can be 13 determined by sampling the LNAPL and determining its specific gravity using well know 14 methods.) Then, the true height of the multiphase liquid above the transducer, H=hL+ hW. The height "H" can be referenced to the transducer elevation, an arbitrary elevation, or an elevation 16 referenced to mean sea level (MSL), or any other reference elevations to compute the true datum 17 of the liquid level measured by the transducer.
19 [0033] In certain embodiments, the sensing system 100 may be used to measure the thickness of a water layer above a DNAPL layer. In such an embodiment, as shown in FIG.
3, a float 330 21 that is negatively buoyant in water and positively buoyant in DNAPL is used.
23 [0034] The distance between the float switch and the transducer establishes the true height 24 "hD" of DNAPL above the transducer. The height "hW" of the water above the water-DNAPL
interface is calculated as follows: First, pressure at 1 psi = 2.307 feet of water and, therefore, 26 PW =hW / 2.307. The pressure exerted by the DNAPL layer is first computed according to the 27 following formula: PD= SGD x (hD / 2.307), where SGD=Specific gravity of the DNAPL. The 28 additional pressure exerted by the water above the water-DNAPL interface is computed as 29 follows: PW = PA - PD. The thickness of water above the water-DNAPL
interface is computed as follows: hW= PW * 2.307. The true height of the multiphase liquid above the transducer, 31 H=hL+hw. As mentioned above, the height "H" can be referenced to the transducer elevation, an 21750433.1 8 1 arbitrary elevation, or an elevation referenced to mean sea level (MSL), or any other reference 2 elevations to compute the true datum of the liquid level measured by the transducer.
4 [0035] As shown in FIG. 4, a second float 430 may be employed to enable the system to measure relatively thin layers with a high level of precision. This system employs a first float 6 430 and a second float 440. The first float 430 can be cup-shaped and define an open portion 7 432 that is complementary in shape to the second float 440. The first float 430 defines at least 8 one passage 434 passing downwardly therethrough so as to allow liquid to drain out of the open 9 portion 432. Thus, as the LNAPL layer thins, the second float 440 can fit into the open portion 432 so as to give a precise indication of the thickness of the LNAPL layer.
The passage 434 (or 11 passages) may be embodied with perforations or as a screen. Also, the passage 434 can be either 12 on the bottom as shown, or extending radially from the side of the float 430. The passage 434 13 allows the second float 440 to seat into the first float 430 without entrapping liquid within the 14 open portion 432.
16 [0036] A three float embodiment, as shown in FIG. 5, allows precise measurement of the 17 thickness of two layers in a multi-layer environment (for example one in which a water layer is 18 above a DNAPL layer and a LNAPL layer is above the water layer). This embodiment adds a 19 third float 330 having a buoyancy that is negative in water and positive in DNAPL. Addition of a transducer (not shown) at the bottom of the stem 112 would allow the layer thickness 21 monitoring of an additional layer above the LNAPL layer.
23 [0037] The range of measurement for all of the versions discussed above can be extended by 24 adding additional lengths of stem. As shown in FIGS. 6A and 6B, the stem 112 can be lengthened as much as desired with a split stem adapter 900, which includes a first section 912 26 and a complimentary second section 914. Standard temperature, barometric correction, and 27 clock functions can be added to the stem adapter 900 as needed. Apart from traditional line 28 power, the system 100 can be powered by various sources of electricity.
Also, a small battery 29 power supply (not shown) can be integrated into the stem 112 to store data for retrieval at a later time. Direct-read cable can be utilized to transmit real time data to a remote receiver or 21750433.1 9 1 wirelessly transmitted to a remote receiver. The stem 112 can be composed of either solid or 2 flex pipe.
4 [0038] Since numerous configurations with different sensing devices are possible, many different mechanical constructions and arrangements of the apparatus are possible. The system 6 may be provided with a protective sleeve to prevent entanglement with other devices that may be 7 deployed adjacent to the device. The system provides continuous real time observations of the 8 liquid levels and the thicknesses at predetermined intervals.
[0039] The above described embodiments, while including the preferred embodiment and the 11 best mode of the invention known to the inventor at the time of filing, are given as illustrative 12 examples only. It will be readily appreciated that many deviations may be made from the 13 specific embodiments disclosed in this specification without departing from the spirit and scope 14 of the invention. Accordingly, the scope of the invention is to be determined by the claims below rather than being limited to the specifically described embodiments above.
21750433.1 10
Claims (27)
1. A multiphase-liquid level sensing system for sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different second phase, comprising:
a. an elongated stem having a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom retainer disposed adjacent the bottom end, the elongated stem defining an elongated cavity therein;
b. a first float disposed coaxially around the elongated stem, a portion of the first float exhibiting a sensible property, the first float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase;
c. a level sensor disposed within the cavity defined by the elongated stem that senses the sensible property of the portion of the first float, the level sensor configured to indicate a second phase liquid distance from the first float to the bottom end of the stem based on where the sensible property is sensed on the level sensor;
d. an overburden sensor extending downwardly from the bottom end of the stem, the overburden sensor configured to sense a property indicative of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above the overburden sensor; and e. a computational circuit, responsive to a first signal from the level sensor, a second signal from the overburden sensor, that calculates a layer thickness of the liquid of the first phase.
a. an elongated stem having a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom retainer disposed adjacent the bottom end, the elongated stem defining an elongated cavity therein;
b. a first float disposed coaxially around the elongated stem, a portion of the first float exhibiting a sensible property, the first float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase;
c. a level sensor disposed within the cavity defined by the elongated stem that senses the sensible property of the portion of the first float, the level sensor configured to indicate a second phase liquid distance from the first float to the bottom end of the stem based on where the sensible property is sensed on the level sensor;
d. an overburden sensor extending downwardly from the bottom end of the stem, the overburden sensor configured to sense a property indicative of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above the overburden sensor; and e. a computational circuit, responsive to a first signal from the level sensor, a second signal from the overburden sensor, that calculates a layer thickness of the liquid of the first phase.
2. The multiphase-liquid level sensing system of Claim 1, further comprising a depth indicator that indicates a depth of the overburden sensor relative to a predetermined point, wherein the computational circuit also calculates the layer depth of the liquid of the first phase.
3. The multiphase-liquid level sensing system of Claim 1, wherein the overburden sensor comprises pressure transducer.
4. The multiphase-liquid level sensing system of Claim 1, wherein the level sensor comprises a plurality of spaced-apart reed switches, each reed switch being capable of switching from a first state to a different second state when subjected to the sensible property of the first float.
5. The multiphase-liquid level sensing system of Claim 1, wherein the sensible property of the first float comprises a magnetic field.
6. The multiphase-liquid level sensing system of Claim 5, wherein the first float comprises:
a. an annular floatation member having a top end and an opposite bottom end;
and b. a magnet that is affixed to the annular floatation member.
a. an annular floatation member having a top end and an opposite bottom end;
and b. a magnet that is affixed to the annular floatation member.
7. The multiphase-liquid level sensing system of Claim 6, wherein the magnet is affixed to the top bottom of the first floatation member.
8. The multiphase-liquid level sensing system of Claim 6, wherein the magnet is affixed to the top end of the first floatation member.
9. The multiphase-liquid level sensing system of Claim 1, further comprising a second float disposed coaxially around the elongated stem above the first float, a portion of the second float exhibiting the sensible property, the second float having a positive buoyancy relative to the liquid of the first phase and a negative buoyancy relative to a liquid of a third phase.
10. The multiphase-liquid level sensing system of Claim 9, wherein the first float comprises:
a. a cup-shaped floatation member having a top end and an opposite bottom end, the cup-shaped floatation member defining an open portion that is complementary in shape to the second float; and b. a magnet that is affixed to the cup-shaped floatation member.
a. a cup-shaped floatation member having a top end and an opposite bottom end, the cup-shaped floatation member defining an open portion that is complementary in shape to the second float; and b. a magnet that is affixed to the cup-shaped floatation member.
11. The multiphase-liquid level sensing system of Claim 10, wherein the first float defines at least one passage passing downwardly therethrough so as to allow liquid to drain out of the open portion.
12. The multiphase-liquid level sensing system of Claim 1, wherein the liquid of the first phase comprises a liquid having a specific gravity that is less than 1 and wherein the liquid of the second phase comprises a liquid having a specific gravity that is not less than 1.
13. The multiphase-liquid level sensing system of Claim 12, wherein the liquid of the first phase comprises a light non-aqueous phase liquid and wherein the liquid of the second phase comprises water.
14. The multiphase-liquid level sensing system of Claim 1, wherein the liquid of the first phase comprises a liquid having a specific gravity that is not greater than 1 and the liquid of the second phase comprises a liquid having a specific gravity that is greater than 1.
15. The multiphase-liquid level sensing system of Claim 14, wherein the liquid of the first phase comprises water and wherein the liquid of the second phase comprises a dense non-aqueous phase liquid.
16. The multiphase-liquid level sensing system of Claim 1, further comprising a third float disposed coaxially around the elongated stem below the first float, a portion of the second float exhibiting the sensible property, the second float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to a liquid of a third phase.
17. The multiphase-liquid level sensing system of Claim 16, wherein the liquid of the third phase comprises a dense non-aqueous phase liquid
18. A multiphase-liquid level sensing system for sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different second phase, comprising:
a. an elongated stem having a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom end disposed adjacent the bottom end, the elongated stem defining an elongated cavity therein;
b. a first float disposed coaxially around the elongated stem, the first float including an annular floatation member having a top end and an opposite bottom end and a magnet that is affixed to the annular floatation member, the magnet configured to generate a sensible magnetic field, the first float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase;
c. a plurality of spaced-apart reed switches disposed within the cavity defined by the elongated stem the level sensor, each reed switch being capable of switching from a first state to a different second state when subjected to a magnetic field so as to indicate a position of the second float, thereby indicating a second phase liquid distance from the first float to the bottom end of the stem;
d. a pressure transducer extending downwardly from the bottom end of the stem, the pressure transducer configured to sense a pressure indicative of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above the pressure transducer;
e. a depth indicator that indicates a depth of the pressure transducer relative to a predetermined point; and f. a computational circuit, responsive to a first signal from the level sensor, a second signal from the pressure transducer and the depth of the pressure transducer, that calculates a layer depth and thickness of the liquid of the first phase.
a. an elongated stem having a top end and an opposite bottom end, a top retainer disposed adjacent the top end and a bottom end disposed adjacent the bottom end, the elongated stem defining an elongated cavity therein;
b. a first float disposed coaxially around the elongated stem, the first float including an annular floatation member having a top end and an opposite bottom end and a magnet that is affixed to the annular floatation member, the magnet configured to generate a sensible magnetic field, the first float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to the liquid of the second phase;
c. a plurality of spaced-apart reed switches disposed within the cavity defined by the elongated stem the level sensor, each reed switch being capable of switching from a first state to a different second state when subjected to a magnetic field so as to indicate a position of the second float, thereby indicating a second phase liquid distance from the first float to the bottom end of the stem;
d. a pressure transducer extending downwardly from the bottom end of the stem, the pressure transducer configured to sense a pressure indicative of a total liquid thickness of the liquid of the first phase and the liquid of the second phase above the pressure transducer;
e. a depth indicator that indicates a depth of the pressure transducer relative to a predetermined point; and f. a computational circuit, responsive to a first signal from the level sensor, a second signal from the pressure transducer and the depth of the pressure transducer, that calculates a layer depth and thickness of the liquid of the first phase.
19. The multiphase-liquid level sensing system of Claim 18, wherein the magnet is affixed to the bottom of the first floatation member.
20. The multiphase-liquid level sensing system of Claim 18, wherein the magnet is affixed to the top end of the first floatation member.
21. The multiphase-liquid level sensing system of Claim 18, further comprising a second float disposed coaxially around the elongated stem above the first float, a portion of the second float exhibiting the sensible property, the second float having a positive buoyancy relative to the liquid of the first phase and a negative buoyancy relative to a liquid of a third phase.
22. The multiphase-liquid level sensing system of Claim 18, further comprising a third float disposed coaxially around the elongated stem below the first float, a portion of the second float exhibiting the sensible property, the second float having a negative buoyancy relative to the liquid of the first phase and a positive buoyancy relative to a liquid of a third phase.
23. The multiphase-liquid level sensing system of Claim 18, wherein the liquid of the first phase comprises a light non-aqueous phase liquid and wherein the liquid of the second phase comprises water.
24. The multiphase-liquid level sensing system of Claim 18, wherein the liquid of the third phase comprises a dense non-aqueous phase liquid
25. The multiphase-liquid level sensing system of Claim 18, wherein the liquid of a first phase comprises water and wherein the liquid of the second phase comprises a dense non-aqueous phase liquid.
26. A method of determining a thickness and a depth of a layer of a liquid of a first phase that is floating on a layer of a liquid of a different second phase, comprising the actions of:
a. detecting a first depth of a portion of a sensor that is placed in the liquid of the second phase;
b. detecting a total liquid thickness between the sensor and the top of the layer of liquid of the first phase;
c. detecting a first distance from the portion of the sensor to an interface between the liquid of the first phase and the liquid of the second phase; and d. calculating the thickness of the layer of the liquid of the first phase by subtracting the first distance from the total liquid thickness.
a. detecting a first depth of a portion of a sensor that is placed in the liquid of the second phase;
b. detecting a total liquid thickness between the sensor and the top of the layer of liquid of the first phase;
c. detecting a first distance from the portion of the sensor to an interface between the liquid of the first phase and the liquid of the second phase; and d. calculating the thickness of the layer of the liquid of the first phase by subtracting the first distance from the total liquid thickness.
27. The method of Claim 26, wherein the action of detecting a depth comprises measuring a length of cable, connected to and supporting the sensor, played out until the sensor reaches the first depth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/689,925 | 2007-03-22 | ||
| US11/689,925 US7730779B2 (en) | 2006-03-22 | 2007-03-22 | Multiphase-liquid level data logger |
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| CA2627814A1 true CA2627814A1 (en) | 2008-09-22 |
| CA2627814C CA2627814C (en) | 2015-11-24 |
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| CA2627814A Active CA2627814C (en) | 2007-03-22 | 2008-03-25 | Multiphase-liquid level data logger |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003172A (en) * | 2010-10-11 | 2011-04-06 | 青岛杰瑞自动化有限公司 | Logging depth correction computation method in logging system |
| US9453394B2 (en) | 2008-08-15 | 2016-09-27 | Cnx Gas Company Llc | Down-hole liquid level control for hydrocarbon wells |
| CN111982235A (en) * | 2019-05-21 | 2020-11-24 | 上海汽车集团股份有限公司 | Oil liquid detection method and device |
| CN112378495A (en) * | 2020-11-02 | 2021-02-19 | 广东电网有限责任公司 | Double-liquid-level detector |
| CN117600212A (en) * | 2023-12-14 | 2024-02-27 | 上海勘察设计研究院(集团)股份有限公司 | A layered multiphase extraction method based on pollutant distribution characteristics |
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2008
- 2008-03-25 CA CA2627814A patent/CA2627814C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9453394B2 (en) | 2008-08-15 | 2016-09-27 | Cnx Gas Company Llc | Down-hole liquid level control for hydrocarbon wells |
| CN102003172A (en) * | 2010-10-11 | 2011-04-06 | 青岛杰瑞自动化有限公司 | Logging depth correction computation method in logging system |
| CN102003172B (en) * | 2010-10-11 | 2013-04-03 | 青岛杰瑞自动化有限公司 | Logging depth correction computation method in logging system |
| CN111982235A (en) * | 2019-05-21 | 2020-11-24 | 上海汽车集团股份有限公司 | Oil liquid detection method and device |
| CN112378495A (en) * | 2020-11-02 | 2021-02-19 | 广东电网有限责任公司 | Double-liquid-level detector |
| CN117600212A (en) * | 2023-12-14 | 2024-02-27 | 上海勘察设计研究院(集团)股份有限公司 | A layered multiphase extraction method based on pollutant distribution characteristics |
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| CA2627814C (en) | 2015-11-24 |
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