CN2680856Y - Bi-electrode induced polarization potential logging tool - Google Patents
Bi-electrode induced polarization potential logging tool Download PDFInfo
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- CN2680856Y CN2680856Y CN 200420030613 CN200420030613U CN2680856Y CN 2680856 Y CN2680856 Y CN 2680856Y CN 200420030613 CN200420030613 CN 200420030613 CN 200420030613 U CN200420030613 U CN 200420030613U CN 2680856 Y CN2680856 Y CN 2680856Y
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- induced polarization
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Abstract
The utility model relates to a bi-electrode induced polarization potential logging tool, belonging to the device class of down-hole logging instrument. In the prior art of induced polarization potential logging tools, by adopting a single measuring electrode structure and arranging an N electric pole of the measuring electrode far away from the ground of an M electric pole, the logging signals are seriously disturbed by the ground and the down-hole, and then a logging curve can be seriously deformed, therefore, the coincidence rate of explaining consequence is low. Referring to the disadvantages, the utility model adopts a design that the N electric pole is inserted in a body case of the down-hole instrument comprising a current electrode A and a measuring electrode M in a measuring loop of the device, therefore, unexpected effects can be generated when logging, and the output impedance in the measuring loop can be reduced, anti-interference capability can be strengthened and the coincidence rate of the explaining curve can be more suitable to the condition of the deformation. Besides, the utility model has the advantages that it has simple structure, easy use and easy operation, and the cost of construction can be reduced, therefore, the utility model can be widely applicable for the logging of the water flooded layer of oil field.
Description
Technical field:
The utility model relates to a kind of bipolar electrode induced polarization potential logging instrument, belongs to well logging downhole instrument device class.
Background technology:
At present, employed induced polarization potential logging instrument in the oil reservoir logging is for the single measurement electrode structure in down-hole, promptly when measuring, measurement electrode (N) is placed the ground location of oil well, cause measuring-signal to be subjected to from the various interference sources in ground and down-hole, and the influence of well site interference source, log is distorted because of interference, thereby reduced the interpretation of logging data coincidence rate, its data can not truly reflect the formation variation situation, when serious interference, and instrument even can't operate as normal.
The utility model content:
The utility model is in order to overcome above-mentioned shortcoming, and a kind of bipolar electrode induced polarization potential logging instrument that provides can reduce the output impedance of measuring the loop, improves equipment anti-interference ability, makes the well logging result more meet the stratum actual conditions.
The utility model is achieved in that
For achieving the above object, the utility model comprises ground power supply system and forms by the downhole instrument that comprises electrodes of A and measurement electrode M that cable connects; Measurement electrode M upper end in described downhole instrument shell connects a N electrode by cable core, and four meters intervals are arranged between this electrode M and the N.
Described cable is connecting one by joint and is adding long electrode, is connecting current electrode B by cable core on adding long electrode, adds the long electrode lower end and connects with joint and downhole probe.
The utility model compared with prior art has distinguishing feature and good effect.
In the structure of the present utility model, because the N electrode that will show in the measurement electrode in the technology places in the downhole instrument, and and have between the M electrode than big distance, therefore overcome in the existing technology potential logging measuring-signal a little less than, very easily be subjected to the drawback that various outer signals are disturbed, meanwhile, the utility model has also improved the Signal-to-Noise of logger, therefore, can improve instrument interference performance and well logging timeliness significantly, and well-log information influences without interruption, can truly reflect strata condition, and very big effect has been played in the identification of oil field Water Flooding Layer.
Description of drawings:
Figure is a structural representation of the present utility model.
Among the figure by 1, ground power supply system, 2, cable, 3, add long electrode, 4, downhole probe, 5, oil well, 6, current electrode B, 7, measurement electrode N, 8, measurement electrode M, 9, electrodes of A forms.
The specific embodiment:
The utility model is provided by following examples.
Below in conjunction with accompanying drawing the utility model is described further.
Ground power supply system 1 is a floor power supply device among the figure, can be used to provide ac square wave by this device for the utility model, and apply a constant external electric field for sand, mudstone stratum by A, B current electrode, make the stratum produce polarization, by intensified stratum with intensify preceding stratum and carry out data contrast, at last the stratum is estimated.Adding long electrode 3, is an electrode that is connected below the cable 2, adds the shell that long electrode is connecting the instrument 4 of going into the well by this, adding on the long electrode 3, a fixedly lead ring is arranged, the current electrode B that twines lead-in wire is arranged on the lead ring, lead-in wire is connected with ground power supply system 1 by cable.Be installed between M electrode 8 and the N electrode 7 in the downhole instrument apart from being four meters.The N electrode is positioned at the top of downhole probe 4 glass fibre reinforced plastic cylinders, M and N measurement electrode structure are the pellicles of forming with ion permeable membrane in the joint ring, joint ring is interior by the silver electrode core, and be equipped with that the pressure balance rubber tube that silver chlorate solution and this ring bottom is equipped with is common to form an electrode system, during well logging, be contained between the silver chlorate of electrode system inside and the outside drilling fluid and form an electric bridge, this electric bridge plays electric action, contact between the drilling fluid that the pellicle joint ring can make isolation and the exploring electrode, thereby at measurement electrode M, N table forms also and polarization phenomena occur, and then reaches and stablize potential difference effect between two measurement electrode.
Electrodes of A is positioned at the glass fibre reinforced plastics casing bottom of downhole probe 4, makes of lead ring, and current electrode B is positioned at the upper part that adds long electrode 3, is all current electrode with the A electrode, and current electrode B distance measurement electrode N centre distance is about 10 meters.
The utility model working method is:
This utility model is the applied chemistry method, by electrodes of A, B and measurement electrode M, N forms, except that the B electrode, other three electrodes are installed in the glass fibre reinforced plastic insulating tube of downhole probe 4 at a certain distance, ground power supply system 1 supplies an AC square wave current to downhole instrument during well logging, by giving sand, mudstone stratum applies a constant external electric field, make the stratum produce polarization, by the polarization potential contrast after measuring the preceding natural potential of polarization and exciting, just can obtain stratum cation and formation water salinity on ground, obtain the stratum oil saturation at last, carry out the water logging situation of quantitative assessment reservoir.Because the measurement electrode in the utility model is positioned at downhole instrument inside, when measuring potential difference, avoided the external interference effect of signals, therefore, certainty of measurement is greatly improved.
Claims (2)
1, a kind of bipolar electrode induced polarization potential logging instrument comprise ground power supply system (1) and the interior current electrode (A) of downhole instrument shell that connects by cable (2), and measurement electrode (M) is formed at interior downhole instrument (4); It is characterized in that measurement electrode M (8) upper end in described downhole probe (4) shell, connect a measurement electrode N (7) by cable core, between measurement electrode M and the N, distance is four meters.
2, a kind of bipolar electrode induced polarization potential logging instrument according to claim 1, it is characterized in that cable (2) is connecting one by a joint and adding long electrode (3), add the long electrode upper end and connect current electrode (B), add the long electrode lower end and be connected above the downhole probe (4) with joint by cable conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420030613 CN2680856Y (en) | 2004-03-01 | 2004-03-01 | Bi-electrode induced polarization potential logging tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420030613 CN2680856Y (en) | 2004-03-01 | 2004-03-01 | Bi-electrode induced polarization potential logging tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2680856Y true CN2680856Y (en) | 2005-02-23 |
Family
ID=34607257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420030613 Expired - Fee Related CN2680856Y (en) | 2004-03-01 | 2004-03-01 | Bi-electrode induced polarization potential logging tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2680856Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176058A (en) * | 2011-03-01 | 2011-09-07 | 中国有色金属工业昆明勘察设计研究院 | Device for IP (induced polarization) measurement of adjustable electrode distance in SDJ-KT hole |
| CN101592029B (en) * | 2009-07-02 | 2012-11-28 | 大庆油田有限责任公司 | Method for well logging with induced polarization spectrum |
| CN102817608A (en) * | 2012-08-18 | 2012-12-12 | 中国石油化工股份有限公司 | Array type electrode system for induced polarization potential logging instrument |
-
2004
- 2004-03-01 CN CN 200420030613 patent/CN2680856Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101592029B (en) * | 2009-07-02 | 2012-11-28 | 大庆油田有限责任公司 | Method for well logging with induced polarization spectrum |
| CN102176058A (en) * | 2011-03-01 | 2011-09-07 | 中国有色金属工业昆明勘察设计研究院 | Device for IP (induced polarization) measurement of adjustable electrode distance in SDJ-KT hole |
| CN102176058B (en) * | 2011-03-01 | 2013-04-03 | 中国有色金属工业昆明勘察设计研究院 | Device for IP (induced polarization) measurement of adjustable electrode distance in SDJ-KT hole |
| CN102817608A (en) * | 2012-08-18 | 2012-12-12 | 中国石油化工股份有限公司 | Array type electrode system for induced polarization potential logging instrument |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050223 Termination date: 20130301 |