CN2356346Y - Impedance sensor on over ring hollow water finding instrument - Google Patents
Impedance sensor on over ring hollow water finding instrument Download PDFInfo
- Publication number
- CN2356346Y CN2356346Y CN 98250463 CN98250463U CN2356346Y CN 2356346 Y CN2356346 Y CN 2356346Y CN 98250463 CN98250463 CN 98250463 CN 98250463 U CN98250463 U CN 98250463U CN 2356346 Y CN2356346 Y CN 2356346Y
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- water
- liquid outlet
- sensor
- impedance sensor
- instrument
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Abstract
The utility model relates to an impedance sensor on an over ring hollow water exploration instrument, which is used for measuring oil-water two-phase flow quantity and water content in an oil well of an oil field to realize real-time monitoring to water content. Then, measurement results are more accurate and reliable. An insulating lining tube 1 is formed between an upper liquid outlet port and a lower liquid outlet port (8, 10) of an over ring hollow water exploration instrument and on the inner wall in an outer shell 2 of the instrument, and four concave ring grooves with separation distances are formed on the inner wall of the insulating lining tube 1. Electrode rings (3, 4, 5, 6) are inlaid on each ring groove, two end electrode rings (3, 6) are connected with a constant current source in a circuit cylinder 7, and a pair of intermediate electrode rings (4, 5) are connected with a circuit amplifier to form the sensor.
Description
The utility model relates to the sensor that is used to measure the through annulus water searcher of the water percentage of oil-water two-phase flow body in the oilfield, can carry out the sensor on the through annulus water searcher of flow measurement when particularly relating to water for external phase, be to form between upper liquid outlet on the water witch and lower liquid outlet.
Oil-field development is in high moisture period, accurately, the water percentage of oil-water two-phase flow is a very important problem under the measuring well reliably.At present, the method that is used to measure the downhole fluid component mainly contains overflow-type capacitance method, sampling capacitor method, radiation density, pressure reduction density and high frequency capacitance method etc.The overflow-type capacitance measurement is subjected to flow rate effect and measuring accuracy low.Sampling formula capacitance measurement is subjected to the influence of production fluid amount fluctuation in the well, and it is representative that sampling is difficult to.What gradiomanometer tool and radioactive density meter were directly measured is density, because oil/water-mass density difference has only 0.2gcm
-3About, the slight error that fluid density is measured brings bigger influence will for the water percentage explanation results.The high frequency capacitance method is by improving electric capacity the two poles of the earth electric voltage frequency, making the fluid electricity lead item and can ignore the influence of measuring.But calculating and experiment show, under the underground survey state, during full water in the sensor in the water conduction current will become the advantage item above displacement current, so sensor will be more much smaller than (institute's water is a tap water) under the ground demarcation state to the response of oil vacuole when height is moisture.Therefore, contain under water, should seek a kind of new method that can measure water percentage continuously exactly at height.
The purpose of this utility model is to avoid the weak point that exists in the above-mentioned present technology, and a kind of real-time (at any time) monitoring that realizes water percentage is provided, and makes the measurement result impedance sensor on the through annulus water searcher more accurately and reliably.
The purpose of this utility model can reach by following technical measures: form the insulation bushing pipe between the upper and lower liquid outlet of water witch on inwall in the tool housing, on the inwall of insulation bushing pipe, form 4 spill annular grooves that spacing is arranged, inlay electrode retaining collar in each annular groove.The two end electrodes articulating is on the circuit constant current source of water witch, and middle two electrode retaining collars are connected on the circuit amplifier, and the two end electrodes ring is made transmitting electrode, and middle two electrodes are done potential electrode.
In such scheme, distance can be the two pairs of electrodes that distribute on 100～200mm arrangement and the coaxial inner conductor between each electrode retaining collar.Constitute this sensor by such scheme, it is to adopt conductance method to measure water percentage, can carry out flow measurement at water during for external phase, has realized the real-time monitoring to water percentage, can finish this purpose.
The utility model is compared with above-mentioned present technology can have following advantage: it is to measure water percentage with conductance method that through annulus water searcher is installed the impedance type sensing, promptly determines water holdup by the relative conductivity of measuring oil-water two-phase flow.The advantage that conductance method is measured water percentage is, can carry out flow measurement at water during for external phase, overcome fluctuation and intermittently fuel-displaced influence in the well, realized the real-time monitoring to water percentage, makes measurement result more accurate, reliably.Impedance type through annulus water searcher measuring accuracy height, the repeatability of instrument and high conformity can provide reliable water percentage information.
Accompanying drawing 1 is a through annulus water searcher principle view.
Accompanying drawing 2 is structural drawing that this sensor is installed in upper and lower liquid outlet (8,10) on Fig. 1.
To be further described the utility model below in conjunction with accompanying drawing:
In conjunction with the accompanying drawings shown in 1, on 2 li inwalls of tool housing, forming insulation bushing pipe 1 by accompanying drawing 2 between the upper and lower liquid outlet of water witch (8,10), on 1 li inwall of insulation bushing pipe, form 4 spill annular grooves that spacing is arranged, in each annular groove, inlay electrode retaining collar (3,4,5,6); Two end electrodes ring (3,6) is connected on 7 li constant current sources of water witch circuit tube, and target ring (4,5) is connected on the circuit amplifier, constitutes this sensor 9.
In such scheme, apart from can be 100～200mm arrangement and on coaxial inner conductor, distributing, can adopt the stainless steel electrode ring between each electrode retaining collar (3,4,5,6); The one symmetrical transmitting electrode at two ends, a middle symmetrical potential electrode treats that fluid measured flows through from the inside of ring electrode.7 li constant current sources of one of two transmitting electrodes and circuit tube join, and other end ground connection provides the exchange current of constant amplitude to transmitting electrode; Fluid between two transmitting electrodes is as the load of constant current source, and the voltage that produces between two potential electrode is through differential amplification, and AC/DC changes, the V/F conversion, and the ground instrument is imported in power amplification into.Finally output is frequency.Frequency by output can further calculate water percentage.
In order to reduce the influence of electrostatic double layer effect, the selection line frequency is 15KHz-23KHz.Electric circuit in well is connected with sensor 9 to be taked every straight measure, prevents that DC potential is coupled to electric circuit in well by conductive fluid, changes the normal operating conditions of electric circuit in well.
In order to determine water holdup, need know the conductivity of water, designed sampler 11 in the sensor bottom for this reason, when logging well, under the instrument behind measurement point, sampler work, lower liquid outlet is sealed, and the fluid behind the afflux is all flowed through sensor from upper liquid outlet 8 outflows, and instrument records the mixed phase value under over-current state, after finishing the measurement of mixed phase value, sensor base is sealed in sampler 11 outages, and oil water mixture separates in sensor, the water logging that is positioned at the bottom there is not sensor, records full water number this moment.In order to shorten disengaging time, electrode is placed on sensor base, and the shared length of electrode only is 1/3 of sensor length.The method of this real-time scale has been proofreaied and correct the influence of local water temperature and salinity.Be the turbo flow meter 12 of measuring flow under the sampler, the lower end is a current collector assembly 14, and inlet 13 is arranged under the current collector.
Claims (2)
1, impedance sensor on a kind of through annulus water searcher that is used to measure oil-water two-phase flow flow and water percentage in the oilfield, between water witch upper liquid outlet (8) and lower liquid outlet (10), constitute, and circuit tube (7) is arranged in the water witch, it is characterized in that: last, lower liquid outlet (8,10) on the inwall of water witch shell (2) lining, form insulation bushing pipe (1) between, on the inwall of insulation bushing pipe (1), form 4 spill annular grooves that spacing is arranged, each annular groove edge electrode retaining collar (3,4,5,6): two end electrodes ring (3,6) is connected on the constant current source of circuit tube (7) lining, target ring (4,5) is connected on the circuit amplifier.
2, impedance sensor according to claim 1 is characterized in that: distance can be 100-200mm between each electrode retaining collar (3,4,5,6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250463 CN2356346Y (en) | 1998-12-14 | 1998-12-14 | Impedance sensor on over ring hollow water finding instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250463 CN2356346Y (en) | 1998-12-14 | 1998-12-14 | Impedance sensor on over ring hollow water finding instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2356346Y true CN2356346Y (en) | 1999-12-29 |
Family
ID=33994944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98250463 Expired - Lifetime CN2356346Y (en) | 1998-12-14 | 1998-12-14 | Impedance sensor on over ring hollow water finding instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2356346Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562026A (en) * | 2010-12-15 | 2012-07-11 | 中国石油天然气股份有限公司 | Gas production and water production section testing method of coal bed gas well and instrument |
| CN109869136A (en) * | 2019-04-11 | 2019-06-11 | 燕山大学 | A kind of land face single pithead oil-water two-phase flow impedance capacitance moisture percentage measuring apparatus |
| CN110243876A (en) * | 2019-06-25 | 2019-09-17 | 西安交通大学 | Conductivity sensor for biphase gas and liquid flow void fraction instantaneous measurement |
-
1998
- 1998-12-14 CN CN 98250463 patent/CN2356346Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562026A (en) * | 2010-12-15 | 2012-07-11 | 中国石油天然气股份有限公司 | Gas production and water production section testing method of coal bed gas well and instrument |
| CN102562026B (en) * | 2010-12-15 | 2015-06-03 | 中国石油天然气股份有限公司 | Gas production and water production section testing method of coal bed gas well and instrument |
| CN109869136A (en) * | 2019-04-11 | 2019-06-11 | 燕山大学 | A kind of land face single pithead oil-water two-phase flow impedance capacitance moisture percentage measuring apparatus |
| CN109869136B (en) * | 2019-04-11 | 2020-07-24 | 燕山大学 | Land single-wellhead oil-water two-phase flow resistance capacitance water content measuring device |
| CN110243876A (en) * | 2019-06-25 | 2019-09-17 | 西安交通大学 | Conductivity sensor for biphase gas and liquid flow void fraction instantaneous measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |