CN101737031B - Novel polar plate of micro-sphere focus logging tool - Google Patents
Novel polar plate of micro-sphere focus logging tool Download PDFInfo
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- CN101737031B CN101737031B CN200910219137A CN200910219137A CN101737031B CN 101737031 B CN101737031 B CN 101737031B CN 200910219137 A CN200910219137 A CN 200910219137A CN 200910219137 A CN200910219137 A CN 200910219137A CN 101737031 B CN101737031 B CN 101737031B
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Abstract
The invention provides a novel polar plate of a micro-sphere focus logging tool, which is characterized in that polar plate electrodes M1, M2, A1, Mo and Ao are oval, the long axis L of the ellipse is two times of the closest distance from electrodes M1, M2, A1 to the electrode Ao longitudinally, the minor axis M of the ellipse is two times of the closest distance from electrodes M1, M2, A1 to the electrode Ao transversely; wherein, the electrode Ao is arranged at the center of the polar plate, and the Mo, Al, M1 and M2 are sequentially arranged from the center to the edge of the polar plate, the electrodes of the polar plate are directly led out by a high-temperature lead wire, and the sequence is M1, M2, Mo, Ao and Al or M2, M1, Mo, Ao, and Al, a 2mm of breakage groove is left below an electrode short circuit sheet, and the shape of the polar plate is streamline form. The novel polar plate of the micro-sphere focus logging tool has high measuring precision and long service life.
Description
Technical field
Patent of the present invention relates to a kind of novel micro-sphere focus logging tool, particularly relates to a kind of sensor-microballoon pole plate of novel micro-sphere focus logging tool.
Background technology
In petroleum geology well logging field, utilize to measure the stratum laterally (vertical borehole axis) variation of different depth resistivity judge the character of stratum oil-containing, gas, water, be the most effective log interpretation method at present.Micro-sphere focus logging tool is a best method of measuring stratum flushed zone (near the borehole wall) resistivity Rxo at present both at home and abroad.Micro-sphere focus logging tool used 24 years in China, remained the best logging method of domestic and international shallow penetration so far.Along with the continuous development of logging technique, higher requirement is proposed micro-sphere focus logging tool; The measurement dynamic range that requires instrument is brought up to 100,000 times from present 10,000 times, and certainty of measurement is brought up to 5% (maximum) from 15%.The raising of technical indicator comprises two aspects: electronic circuit and sensor-microballoon pole plate.
Former polar plate of micro-sphere focus logging tool is with reference to the MSFL plate designs of schlumberger company in 1985.Find that through the use of two more than ten years there is following problem in this pole plate:
During microballoon focused electron apparatus measures stratum simulation box (0.2-2000 ohm meter), error is less than 5%, when instrument is logged well, to high resistivity (1000-2000 ohm meter) stratum measurement profile amplitude (30%--50%) often on the low side; Sometimes even negative value occurs, make the instrument can't operate as normal.When its difference was exactly the measure analog case, not through pole plate and stratum media, but instrument directly linked to each other with simulation box (resistor network).This problem was just found as far back as 1992; Propose because the scale K value (0.041 meter) that micro-sphere focus logging tool uses is a Schlumberger company, it is an experience scale K value considering that most of well logging geological conditions (Hmc, Rmc, Rxo/Rmc) provides.Find in China's well logging process: the scale K value (0.041 meter) that micro-sphere focus logging tool uses is under the Different Strata condition, and producing measure error is different (seeing table 1).
The table 1Schlumberger K of company value measure error
When Hmc greater than 19mm and Rxo/Rmc greater than 50 the time, the error of apparatus measures can be bigger.For many years, much human is all thought head it off, and the someone wants to use different K values through each oil field; Someone wants log to be proofreaied and correct solved through making accurate correcting plate.But finally all can not really solve micro-sphere focus logging tool because the measure error that the pole plate electric field distortion produces.Owing to the existence of this measure error, influence the measurement dynamic range of instrument, old instrument can only reach (0.2-2000 ohm meter).Patent of the present invention is through the analysis to the sphere focusing logging electric field; Through a large amount of electric field simulation experiments; We think that causing sphere focusing logging (under some geological conditions) basic reason that measure error is big is the electric field distortion of micro-sphere focus logging tool, and this electric field distortion is owing to unreasonable the causing of microballoon pole plate electrode shape design.Want through adopting different K values and correcting plate really not to solve.
The shape of pole plate has very big influence application life to logging quality and pole plate, and M1M2 electrodes use 188X138mm rectangle at present is emitted on the ragged edge of pole plate, and is so the profile of microballoon pole plate also can only be the rectangle that " both wings " are arranged, as shown in Figure 3.During well logging, pole plate receives the backup power more than 25 kilograms, is close to the borehole wall and slides fast; When the borehole wall was irregular sandstone or limestone, " both wings " of pole plate part was just scraped by the borehole wall easily and makes pole plate and borehole wall loose contact, caused the curve shake; When combination logging; Because several kinds of instruments are chained together and once descend well measurements, it is bad to cause the microballoon pole plate to contact with the borehole wall more easily, makes the measurement curve abnormality.Pole plate can be scratched and influences and log well successfully when serious.
As shown in Figure 3; The electrode of former pole plate is rectangular; Each point is mutually far short of what is expected to the distance of Ao electrode on M1 or the M2 electrode, and M1, M2 electrode are the monitor electrodes of the main electric field balance of control, and the equilibrium conditions that microballoon focuses on apparatus measures is that potential difference is zero between M1, the M2 electrode.Because each point does not wait to the distance of Ao electrode on the M1, M2 electrode, it is mobile in electrode, just to have electric current, and we are called error current Δ I this part electric current, and it not only can the loss electric field energy but also spherical electric field is distorted.Formation resistivity is high more, and spherical electric field distortion is also big more.Can see through simulating lab test, increase that measure error also can increase, and sees Fig. 5 with formation resistivity.When at resistivity Rxo/Rmc during, because of the distortion of electric field can cause the apparatus measures error to be increased to more than 100% greater than 1000 above stratum measurements.When serious, instrument can't operate as normal.
Summary of the invention
The objective of the invention is fundamentally to solve the problem that micro-sphere focus logging tool device pole plate electric field aspect exists, design a kind of novel polar plate of micro-sphere focus logging tool, certainty of measurement is high, the pole plate long service life.
Technical scheme of the present invention is: a kind of novel polar plate of micro-sphere focus logging tool; The profile that it is characterized in that pole plate is streamlined; Pole plate electrode M1 M2 A1 Mo Ao is oval; Long axis of ellipse L is the twice that each electrode M1, M2, A1 vertically arrive Ao electrode minimum distance, and oval minor axis M is the twice that each electrode M1, M2, A1 laterally arrive Ao electrode minimum distance; Wherein electrode A o is positioned at the center of pole plate, is followed successively by Mo, A1, M1, M2 from the center to the pole plate edge; The pole plate electrode is directly drawn by high temperature wire, and ordering is M1 M2 Mo AoA1 or M2 M1 Mo Ao A1, below the electric pole short circuit sheet, stays the 2mm fault trough.
The present invention is shielded the reasonable distribution of Electrode Field according to sphere focusing logging principle and sphere focusing logging master, designs and the diverse one group of new pole plate of former polar plate of micro-sphere focus logging tool electric field, and new pole plate has following advantage when well logging:
1, after electrode shape changed ellipse into, electrical field shape also was spherical.Error current Δ I in the electrode reduces more than 80%, receives low-resistance mud cake (Rmc) influence little so measure numerical value (Rxo); Especially for high resistance stratum Rxo/Rmc greater than 1000 o'clock, new pole plate is high more a lot of than old pole plate certainty of measurement.
2, replace original rectangle because electrodes use is oval, improved contacting of pole plate and the borehole wall widely, thereby improved the logging data quality and the success rate of logging well.
3, the pole plate profile make into streamlined, make improve in pole plate application life a lot.
Description of drawings
Fig. 1 is the distribution schematic diagram of microballoon focusing electric field in non-uniform dielectric.
Fig. 2 is the distribution schematic diagram of microballoon focusing electric field in uniform dielectric.
Fig. 3 is former microballoon pole plate electrode size figure.
Fig. 4 is sphere focusing logging pole plate figure of the present invention.
Fig. 5 is the old and new's pole plate non-uniform dielectric measure R xo comparison diagram.
Fig. 6 is old pole plate electric field intensity map.
Fig. 7 is new pole plate electric field intensity map.
Fig. 8 is an electric pole short circuit sheet fluting sketch map.
The specific embodiment
The basic principle of sphere focusing logging: sphere focusing logging is mainly measured the resistivity Rxo of permeable formation flushed zone.The apparent resistivity that all electrical logs are measured only reflects that supply current is distributed in the change in resistance of medium part.Sphere focusing logging is exactly through changing the arrangement and the power supply mode of electrode, the principal current overwhelming majority being distributed in the stratum flushed zone 2, in order to reduce the influence of 1 pair of measurement of permeable formation low-resistivity mud cake; A bucking electrode A1 and a mudcake correction electrode Mo near main electrode Ao, have been increased; Between Ao and A1, supply and the synchronous bucking current I1 of main electrode, because the I1 overwhelming majority is distributed in the low-resistance mud cake, principal current Io receives the shielding of same-phase I1; Can only pass mud cake 1 entering stratum flushed zone 2; In the flushed zone of stratum, principal current no longer receives I1 shielding and the picture point electrode is the same, the radial emission of medium towards periphery.Like this, just guaranteed that principal current mainly is distributed in the stratum flushed zone.The Rxo that sphere focusing logging is measured mainly reflects the stratum flushed zone resistivity.
On longitudinal profile, desirable electric field should be to be the center of circle with Ao, in the point source electric field for R; The point position of any point M: Um=RtIo/4 ∏ X1/AM; Any 2 MN (AM ≠ AN),, just have electric current in the resistance and flow through that does not wait to A point distance in electric field if will couple together with resistance R.The size of current's intensity Δ I with resistivity of media Rt, be directly proportional with principal current Io intensity, be inversely proportional to 2 distances of ordering of MN to A, the relation of its potential difference is following:
The point position that M is ordered: Um=RtIo/4 ∏ X1/AM-----(1)
The point position that N is ordered: Un=RtIo/4 ∏ X1/AN-----(2)
After 2 of MN connect with resistance R,
Electric current between the MN: Δ I=(Um-Un)/R-(3)
With 1 and 2 formula substitutions, 3 formulas:
ΔI＝Rt?X?Io?X(AM-AN)/4∏XRX?AM?X?AN
Can find out from following formula: error current Δ I is directly proportional with formation resistivity Rt, principal current Io and 2 range differences of ordering to A of MN are inversely proportional to; Be inversely proportional to the resistance of the resistance R that is connected between the MN.
The microballoon pole plate changes pole plate curvature with the borehole wall neatly for when logging well, and each electrode is made up of a plurality of electrode blocks.Link together the resistance R between the electrode block very little (being generally less than 0.05 ohm) by the good substrate (beryllium-bronze sheet) of conduction again between the electrode block.But can make error current Δ I become big like this, measurement is caused certain error.And error can increasing and increase with formation resistivity.
Patent of the present invention provides a kind of sensor one microballoon pole plate of novel micro-sphere focus logging tool; The electrode of this novel pole plate is according to the distribution of sphere focusing logging principle and sphere focusing logging main electrode electric field; Designed one group of new electrode M1 M2 A1 Mo AO; Wherein electrode A o is positioned at the center of pole plate, is followed successively by Mo, A1, M1, M2 from the center to the pole plate edge, and the shape of new electrode changes original rectangular electrodes into oval-shaped electrode according to equipotential surface 4 principles; And the profile of novel pole plate is changed into and is received less streamlined, as shown in Figure 4 of resistance.The major axis of novel pole plate (vertically) is identical with original pole plate with minor axis (laterally), so the investigation depth 3 of this pole plate identical with former pole plate (15CM).
Patent of the present invention is in order to overcome the influence of pole plate electrode error current Δ I to certainty of measurement; Is the shaped design of microballoon pole plate electrode oval; Long axis of ellipse is the twice that each electrode (M1 M2A1) vertically arrives Ao electrode minimum distance, and oval minor axis is the twice that each electrode (M1 M2 A1) laterally arrives Ao electrode minimum distance.Connect the other side of the substrate (beryllium-bronze sheet) of each electrode block, open the fault trough of 2mm, to reduce the influence of error current at electrode outlet line.The electrode block material of forming each electrode adopts pure iron, with material be that the substrate of beryllium-bronze sheet uses laser weld to be one.
The electrode of patent of the present invention is directly drawn by high temperature wire, and ordering is M1 M2MoAoA1 (former pole plate is M1MoAoA1M2) or M2M1MoAoA1.Make monitor electrode M1M2 lead-in wire near, reduce the interference (M1M2 working signal be microvolt) of current electrode lead-in wire A1 to the M1M2 lead-in wire.Improve the degree of accuracy of well logging so greatly, reduced error.
See that with Fig. 2 the electric field that main electrode Ao forms should be coccoid for a semiellipse from sphere focusing logging Electric Field Distribution schematic diagram 1 in flushed zone 2.And because the M1M2 electrode shape of former microballoon focusing pole plate is a rectangle, the electric field of main electrode Ao no longer is to be the coccoid (see figure 6) of semiellipse at center with main electrode Ao, and Fig. 6 and Fig. 7 are that the old and new's pole plate is at the same terms (uniform dielectric; Identical Io, I1 emissive porwer) under, the electric field comparison diagram of measuring.Old pole plate electric field is littler than new pole plate Electric Field Distribution scope; And electrical field shape is the semiellipse spheroid of distortion.This distortion can produce certain measuring errors under the non-uniform dielectric condition, and measure error can increase with the increase of increasing with cake thickness of formation resistivity.
Claims (1)
1. novel polar plate of micro-sphere focus logging tool; The profile that it is characterized in that pole plate is streamlined; Pole plate electrode M1, M2, A1, Mo, Ao are oval; Long axis of ellipse L is the twice that each electrode M1, M2, A1 vertically arrive Ao electrode minimum distance, and oval minor axis M is the twice that each electrode M1, M2, A1 laterally arrive Ao electrode minimum distance; Wherein electrode A o is positioned at the center of pole plate, is followed successively by electrode Mo, A1, M1, M2 from the center to the pole plate edge; The pole plate electrode is directly drawn by high temperature wire, and ordering is electrode M1, M2, Mo, Ao, A1 or electrode M2, M1, Mo, Ao, A1, below the electric pole short circuit sheet, stays the 2mm fault trough.
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| CN200910219137A CN101737031B (en) | 2009-11-25 | 2009-11-25 | Novel polar plate of micro-sphere focus logging tool |
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| CN101737031B true CN101737031B (en) | 2012-09-19 |
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Families Citing this family (3)
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| CN102352748B (en) * | 2011-10-25 | 2015-02-18 | 西安威盛电子仪器有限公司 | Polar plate of micro-disc type focused logging device |
| CN102865069B (en) * | 2012-09-13 | 2015-02-18 | 中国电子科技集团公司第二十二研究所 | Micro-column type focused logging instrument and micro-column type focused logging method thereof |
| CN103321631A (en) * | 2013-07-19 | 2013-09-25 | 陈耕 | Microspheric focusing polar plate and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201543U (en) * | 1988-03-11 | 1988-10-19 | 西安石油勘探仪器总厂 | Polar board of mini-ball focus logging equipment for small well |
| CN2161721Y (en) * | 1993-03-27 | 1994-04-13 | 西安石油勘探仪器总厂 | Polar Plate of thin microball focusing well measuring instrument |
| GB2364777A (en) * | 2000-07-12 | 2002-02-06 | Sondex Ltd | An improved capacitance measurement probe |
| CN200940483Y (en) * | 2006-05-23 | 2007-08-29 | 辽河石油勘探局 | Test and checking box for microball focus logging instrument |
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- 2009-11-25 CN CN200910219137A patent/CN101737031B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201543U (en) * | 1988-03-11 | 1988-10-19 | 西安石油勘探仪器总厂 | Polar board of mini-ball focus logging equipment for small well |
| CN2161721Y (en) * | 1993-03-27 | 1994-04-13 | 西安石油勘探仪器总厂 | Polar Plate of thin microball focusing well measuring instrument |
| GB2364777A (en) * | 2000-07-12 | 2002-02-06 | Sondex Ltd | An improved capacitance measurement probe |
| CN200940483Y (en) * | 2006-05-23 | 2007-08-29 | 辽河石油勘探局 | Test and checking box for microball focus logging instrument |
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