CN105525918A - Dual laterolog equipment, electrode system of dual laterolog equipment and formation resistivity measuring method - Google Patents
Dual laterolog equipment, electrode system of dual laterolog equipment and formation resistivity measuring method Download PDFInfo
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Abstract
The invention relates to dual laterolog equipment, an electrode system of the dual laterolog equipment and a formation resistivity measuring method. The electrode system comprises an electrode system body and an insulation core rod, consists of a plurality of electrodes arranged on one insulation core rod, and is connected with a measuring circuit through a conducting wire; insulation materials are used for separating the plurality of electrodes; the center of the insulation core rod is a metal rod; a through hole is formed in the center of the metal rod; the metal rod is isolated from the electrode system; the electrode system comprises main electrodes A0 and A0', at least one pair of shielding electrodes A2, A2', A1 and A1', a plurality of pairs of voltage measuring electrodes A1*, A1*', M0 and M0' and at least one pair of voltage monitoring electrodes M2, M2', M1 and M1', wherein the main electrodes A0 and A0' are arranged in the middle of the electrode system; the shielding electrodes A2, A2', A1 and A1' are used for emitting shielding current for focusing main current; the voltage measuring electrodes A1*, A1*', M0 and M0' are used for measuring electrode voltage; the voltage monitoring electrodes M2, M2', M1 and M1' are used for voltage monitoring; the shielding electrodes A2 and A2 are in short-circuit connection; the main electrodes A0 and A0' are in short-circuit connection; and other electrodes are not in short-circuit connection. Therefore compared with a hard focusing mode, the electrode system has high measuring precision.
Description
Technical field
The present invention relates to a kind of well logging apparatus for petroleum exploration and development, particularly a kind of dual laterolog equipment and electrode system, formation resistivity measuring method.
Background technology
Dual laterolog equipment is Formation Resistivity Measurement in open hole well, and research stratum invades change, the key instrument of estimation oil saturation.Traditional dual laterolog equipment mainly comprises electrode system, electronic circuit, insulating short section, is always about 7 ~ 10 meters, dark side direction investigation depth about 1 ~ 1.5 meter, and shallow side direction investigation depth about 0.2 ~ 0.5 meter, longitudinal frame is about 0.6 meter.Traditional double lateralog is when carrying out deep lateral log, and ring electrode emission current enters stratum, and columnar electrode is launched bucking current and focused on principal current, needs backfeed loop and regulate bucking current in electronic circuit, controls monitor electrode and is in equipotential.Such as, Chinese patent CN1712995A discloses a kind of logging instrument with strong focus and double side directions, its structure composition mainly comprises insulating short section, electrode system and electronic circuitry part composition, wherein said electrode system comprises a main electrode, and centered by main electrode, form with symmetrical monitor electrode, bucking electrode, back-up surveillance electrode and loop electrode, this instrument remains conventional bilateral to the most shallow mode standard of investigation depth, adds the dark side direction strong-focusing patterns of shallow side direction and three layers of shielding with double layer screen.In theory, this type of focusing requires that amplifier has infinitely-great gain, but in practice, the gain due to amplifier is limited, and monitor electrode is not strictly equipotential, and introduces error in the measurement results.This error is very little in traditional double laterolog, but can be very large in High Resolution Dual Laterolog Logging.
Along with going deep into of oil-gas exploration and development, the reservoirs such as thin interbed also become the emphasis of exploration gradually, this just needs to have high-resolution logging instrument, and the resolution ratio of traditional dual laterolog equipment is generally 0.6m, the needs of exploration can not be met, meanwhile, logging operation rat hole length is short, high angle hole, horizontal well, the workload of the bad hole conditions such as fish-bone Multilateral Wells increases year by year, tradition On Dual-Lateral Log length about 7 ~ 10m, be unfavorable for wellsite applications operation and combination logging, at high angle hole, horizontal well, meet card probability under the bad hole conditions such as fish-bone Multilateral Wells greatly to increase.
By research institute of China Electronic Science and Technology Corporation the 22nd propose application number be 201210233337 application discloses a kind of high-resolution azimuthal resistivity lateralog and logging method, this high-resolution azimuthal resistivity lateralog is primarily of azimuthal electrodes system and measure electronic circuit composition, described electrode system is made up of the lateral electrodes ring of the multiple different in width be embedded on insulating carrier and azimuthal electrodes ring M0, electrode system central authorities are M0, the electrode retaining collar of 14 different in width take M0 as axis of symmetry, be spaced according to different, each homonymy electrode ring wire short circuit keeps equipotential, described each homonymy electrode ring, azimuthal electrodes ring, reference electrode N and loop B respectively connects measuring circuit by wire.Although this high-resolution azimuthal resistivity logging instrument and logging method adopt digital focus pattern and hard focusing mode, compare original hard focus circuit collection capacity to increase, certainty of measurement improves greatly, metrical information is also abundanter, but because it adopts the mode of each homonymy electrode ring wire short circuit, still do not solve the impact of the vertical potential gradient formed in centre, thus be difficult to reach higher certainty of measurement.
Summary of the invention
The technical problem to be solved in the present invention is: in view of the foregoing defects the prior art has, provides a kind of high-resolution dual laterolog equipment based on the software type of focusing, double-lateral log equipment electrode system and method for measuring resistivity.
In order to solve above-mentioned problems of the prior art, the invention provides a kind of double-lateral log equipment electrode system, comprise electrode system and insulation mandrel, described electrode system is made up of the multiple electrodes be arranged on a described insulation mandrel, and be connected with measuring circuit by wire, wherein
Adopt insulation materials to separate between described multiple electrode, the center of described insulation mandrel is a metal bar, and described metal bar center is provided with through hole, insulate between described metal bar and described electrode system, and described electrode system comprises:
Be arranged at the main electrode A0 of the centre of described electrode system, A0 ';
Launch bucking current with at least one pair of bucking electrode A2, A2 of focusing on principal current ' and A1, A1 ';
Multipair voltage measurement electrodes A1*, the A1* ' of measurement electrode voltage and M0, M0 '; And
At least one pair of voltage monitoring electrode M2, M2 for voltage monitoring ' and M1, M1 ',
Wherein said bucking electrode A2, A2 ' short circuit, described main electrode A0, A0 ' short circuit, other electrode not short circuit.
Preferably, in above-mentioned double-lateral log equipment electrode system, pair of electrodes M0, M0 ' among described multipair voltage measurement electrodes are positioned in the middle of electrode system, are used for measuring the voltage of described main electrode A0, A0 ' respectively.
Preferably, in above-mentioned double-lateral log equipment electrode system, described multiple electrode is arranged in order as electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 0, electrode M0, electrode M0 ', electrode A 0 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ' from one end of electrode system to the other end.
The present invention also provides a kind of dual laterolog equipment, and for the measurement of formation resistivity, it has above-mentioned double-lateral log equipment electrode system.
In addition, the present invention also provides a kind of measuring method of formation resistivity, adopts above-mentioned dual laterolog equipment to carry out formation resistivity measurement, it is characterized in that, makes above-mentioned two-way tool operation under following Three models:
In mode 1, the current load that output module exports is on electrode A 1, A1 ' and electrode A 2, A2 ', the current potential of back-up surveillance circuit module holding electrode A1* and electrode A 2 equipotential, electrode M2, M2 under this pattern of data acquisition module record ' and electrode M1, M1 ', and be designated as
,
,
,
, the current potential of recording electrode N, is designated as simultaneously
;
In mode 2, the current load that output module exports in electrode A 1, A1 on ' on, and refurn electrode A2, A2 ', the current potential of electrode M2, M2 under this pattern of data acquisition module record ', electrode M1, M1 ', and being designated as
,
,
,
, recording electrode N current potential, is designated as simultaneously
;
In mode 3, the current load that output module exports is in electrode A 0, on A0 ', and refurn electrode A1, A1 ' and electrode A 2, on A2 ', supervision return circuit module holding electrode A1* and electrode A 2 equipotential, electrode A 1* ' and electrode A 2 ' equipotential, this pattern bottom electrode of data acquisition module record M2, M2 ', the current potential of electrode M1, M1 ', electrode M0, M0 ', and be designated as
,
,
,
,
,
, recording electrode N current potential, is designated as simultaneously
; Recording electrode A0, A0 ' on electric current, be designated as
,
.
Preferably, in above-mentioned formation resistivity measuring method, utilize described pattern 1 to combine with described mode 3, can deep lateral apparent resistivity be obtained:
Wherein,
for dark side direction instrument coefficient,
。
Preferably, in above-mentioned formation resistivity measuring method, utilize described pattern 2 to combine with described mode 3, shallow side direction apparent resistivity can be obtained:
Wherein,
for shallow side direction instrument coefficient,
。
Preferably, in above-mentioned formation resistivity measuring method, the data gathered under utilizing described 3 kinds of mode of operations can also calculate dark, the shallow side direction apparent resistivity curve of following high-resolution:
Wherein,
,
be respectively high-resolution dark, shallow side direction instrument coefficient,
。
Compared with prior art, the present invention has the following advantages:
The invention solves traditional double side direction and adopt the hardware type of focusing, circuit realizes main monitoring by closed loop and controls, large by ambient conditions, the problems such as focusing effect deviation, avoid the impact of rest potential between monitor electrode in hard focusing, improve longitudinal frame significantly.Meanwhile, solve the vertical gradient that centre is formed, further enhancing the focusing power of instrument, improve the certainty of measurement of instrument.
In addition, the present invention can obtain that 2 standards are dark simultaneously, shallow resistivity curve and 2 high-resolution are dark, shallow resistivity curve; High-resolution well logging curve can identify the thin layer of 0.1m, and can measure the true resistance rate obtaining 0.4m thin layer.
Moreover the design scheme of high-resolution double-lateral log equipment electrode system of the present invention effectively can shorten tool length, improve the applicability of instrument under bad hole environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of high-resolution double-lateral log equipment electrode system of the present invention.
Fig. 2 A, Fig. 2 B are respectively pattern 1, the mode 3 of high resolution bilateral logging tool of the present invention; Fig. 2 C adopts high resolution bilateral logging tool of the present invention to synthesize the deep lateral log pattern obtained.
Fig. 3 A, Fig. 3 B are respectively pattern 2, the mode 3 of high resolution bilateral logging tool of the present invention; Fig. 3 C adopts high resolution bilateral logging tool of the present invention to synthesize the shallow lateral logging pattern obtained.
Detailed description of the invention
Traditional dual laterolog equipment adopts the hardware type of focusing, circuit realizes main monitoring by closed loop and controls, by the large (variations in temperature of ambient conditions, power-supply fluctuation etc.), residual voltage cannot be eliminated, focusing effect deviation (logic bilateral reaches 25000 times to main monitoring multiplication factor, the limit close to circuit design).And present invention employs the software type of focusing.It is a kind of brand-new type of focusing that software focuses on, it utilizes electric field superposition principle, focus current is synthesized by the electric current of two non-focusing states, focused condition is unconditionally met, therefore the impact of residual current between monitor electrode in hardware focusing can be prevented, thus become the effective ways improving longitudinal frame.
The structure of high-resolution double-lateral log equipment electrode system of the present invention as shown in Figure 1, it is formed primarily of electrode system, insulation mandrel two parts, electrode system is connected with measuring circuit by wire, also includes reference electrode N(in the entire system not shown), loop electrode B.In addition, electrode system is made up of 14 electrodes be arranged on an insulation mandrel, be followed successively by A2, A1*, A1, M2, M1, A0, M0, M0 from one end of electrode system to other end electrode title ', A0 ', M1 ', M2 ', A1 ', A1* ', A2 ', and it is in tandem on an insulation mandrel, insulation materials is adopted to separate between electrode, and the center of insulation mandrel is a metal bar, there is through hole at metal bar center, insulate between metal bar and electrode system.Wherein, electrode A 2, A2 ' and electrode A 1, A1 ' are bucking electrode, are positioned at the two ends of electrode system, and above-mentioned bucking electrode A2, A2 ' between connected by wire, be used for launching bucking current to focus on principal current.Electrode A 0, A0 ' they are main electrode, are positioned at the centre of electrode system, and it is by electrode M0, M0 ' be divided into two parts, and connected by wire between electrode A 0, A0 ', be used for launching principal current.The voltage of the ring electrodes such as also comprise electrode A 1*, A1* ', electrode M2, M2 in electrode system ', electrode M1, M1 ' and electrode M0, M0 ', this ring electrode A1*, A1* ' be used for respectively measuring bucking electrode A1, A1 '.In addition, two couples of ring electrodes M2, M2 ' and electrode M1, M1 ' are as voltage monitoring, and ring electrode M0, M0 ' be positioned in the middle of electrode system, be used for the voltage of measurement electrode A0, A0 ' respectively.
That is, in the present invention, electrode A 2, A2 ' between direct wire link together, be then connected with circuit; Electrode A 0, A0 ' between direct wire link together, be then connected with circuit, and other electrode directly and circuit link together.
Present embodiment discloses a kind of logging method adopting this high resolution bilateral logging tool.Electric field superposition principle in focusing on according to software, logging method of the present invention can be analyzed to the stand-alone mode of pattern 1, pattern 2 and these three different frequencies of mode 3, and deeply, the type of focusing of shallow side direction can adopt this Three models combination of two to be realized.
Fig. 2 A, Fig. 2 B are respectively pattern 1, the mode 3 of high resolution bilateral logging tool of the present invention.Fig. 3 A, Fig. 3 B are respectively pattern 2, the mode 3 of high-resolution dual laterolog equipment of the present invention.
As shown in fig. 2, in mode 1, the current load that output module exports is on electrode A 1, A1 ' and electrode A 2, A2 ', back-up surveillance circuit module holding electrode A1* and electrode A 2 equipotential, electrode A 1* ' and electrode A 2 ' equipotential, the current potential of electrode M2, M2 under this pattern of data acquisition module record ' and electrode M1, M1 ', and be designated as
,
,
,
, the current potential of recording electrode N, is designated as simultaneously
.
As shown in fig. 3 a, in mode 2, the current load that output module exports is in electrode A 1, A1 ' on, and refurn electrode A2, A2 ' on.The current potential of electrode M2, M2 under this pattern of data acquisition module record ', electrode M1, M1 ', and be designated as
,
,
,
, recording electrode N current potential, is designated as simultaneously
.
As shown in accompanying drawing 2B and accompanying drawing 3B, in mode 3, the current load that output module exports is in electrode A 0, on A0 ', and refurn electrode A1, A1 ' and electrode A 2, on A2 ', supervision return circuit module holding electrode A1* and electrode A 2 equipotential, electrode A 1* ' and electrode A 2 ' equipotential.This pattern bottom electrode of data acquisition module record M2, M2 ', electrode M1, M1 ', electrode M0, M0 ' current potential, and to be designated as
,
,
,
,
,
, recording electrode N current potential, is designated as simultaneously
; Electric current on recording electrode A0, A0 simultaneously ', is designated as
,
.
Embodiment 1
Fig. 2 C adopts high resolution bilateral logging tool of the present invention to synthesize the deep lateral log pattern obtained.The data gathered under utilizing above 3 kinds of mode of operations can calculate formation apparent resistivity.As shown in accompanying drawing 2C, Land use models 1 and mode 3 combine, and can obtain deep lateral apparent resistivity:
Wherein,
for dark side direction instrument coefficient,
。
Embodiment 2
Fig. 3 C adopts high resolution bilateral logging tool of the present invention to synthesize the shallow lateral logging pattern obtained.The data gathered under utilizing above 3 kinds of mode of operations can calculate formation apparent resistivity.As shown in accompanying drawing 3C, Land use models 2 and mode 3 combine, and can obtain shallow side direction apparent resistivity:
Wherein,
for shallow side direction instrument coefficient,
。
The data gathered under utilizing 3 kinds of above-mentioned mode of operations can also calculate dark, the shallow side direction apparent resistivity curve of following high-resolution:
Wherein,
,
be respectively high-resolution dark, shallow side direction instrument coefficient,
。
In the present invention, electrode A 2, A2 ' short circuit, electrode A 0, A0 ' short circuit, other electrode not short circuit.Adopt drive circuit control electrode A1, the potential difference between A1 ' eliminates the vertical gradient formed in centre, namely realizes
, more accurate focused condition is provided.
The present invention adopts soft-focus mode, and circuit realiration adopts open loop approach, less by ambient conditions, improves certainty of measurement when formation resistivity is measured, effectively can shorten the length of dual laterolog equipment, improve the applicability of instrument under bad hole environment.Meanwhile, this logging instrument and logging method can identify thin layer and the thin interbed of detection 0.1m, for thin layer well logging provides effective log.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, but those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a double-lateral log equipment electrode system, comprises electrode system and insulation mandrel, and described electrode system is made up of the multiple electrodes be arranged on a described insulation mandrel, and is connected with measuring circuit by wire, wherein
Adopt insulation materials to separate between described multiple electrode, the center of described insulation mandrel is a metal bar, and described metal bar center is provided with through hole, insulate between described metal bar and described electrode system, and described electrode system comprises:
Be arranged at the main electrode A0 of the centre of described electrode system, A0 ';
Launch bucking current with at least one pair of bucking electrode A2, A2 of focusing on principal current ' and A1, A1 ';
Multipair voltage measurement electrodes A1*, the A1* ' of measurement electrode voltage and M0, M0 '; And
At least one pair of voltage monitoring electrode M2, M2 for voltage monitoring ' and M1, M1 ',
Wherein said bucking electrode A2, A2 ' short circuit, described main electrode A0, A0 ' short circuit, other electrode not short circuit.
2. double-lateral log equipment electrode system as claimed in claim 1, pair of electrodes M0, M0 ' among wherein said multipair voltage measurement electrodes are positioned in the middle of electrode system, are used for measuring the voltage of described main electrode A0, A0 ' respectively.
3. double-lateral log equipment electrode system as claimed in claim 1, wherein said multiple electrode is arranged in order as electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 0, electrode M0, electrode M0 ', electrode A 0 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ' from one end of electrode system to the other end.
4. a dual laterolog equipment, for the measurement of formation resistivity, is characterized in that, has the double-lateral log equipment electrode system described in claims 1 to 3.
5. a formation resistivity measuring method, adopts the dual laterolog equipment described in claims 1 to 3 to carry out formation resistivity measurement, it is characterized in that, make above-mentioned two-way tool operation under following Three models:
In mode 1, the current load that output module exports is on electrode A 1, A1 ' and electrode A 2, A2 ', the current potential of back-up surveillance circuit module holding electrode A1* and electrode A 2 equipotential, electrode M2, M2 under this pattern of data acquisition module record ' and electrode M1, M1 ', and be designated as
,
,
,
, the current potential of recording electrode N, is designated as simultaneously
;
In mode 2, the current load that output module exports in electrode A 1, A1 on ' on, and refurn electrode A2, A2 ', the current potential of electrode M2, M2 under this pattern of data acquisition module record ', electrode M1, M1 ', and being designated as
,
,
,
, recording electrode N current potential, is designated as simultaneously
;
In mode 3, the current load that output module exports is in electrode A 0, on A0 ', and refurn electrode A1, A1 ' and electrode A 2, on A2 ', supervision return circuit module holding electrode A1* and electrode A 2 equipotential, electrode A 1* ' and electrode A 2 ' equipotential, this pattern bottom electrode of data acquisition module record M2, M2 ', the current potential of electrode M1, M1 ', electrode M0, M0 ', and be designated as
,
,
,
,
,
, recording electrode N current potential, is designated as simultaneously
, recording electrode A0, A0 ' on electric current, be designated as
,
.
6. formation resistivity measuring method as claimed in claim 5, utilizes described pattern 1 to combine with described mode 3, can obtain deep lateral apparent resistivity:
Wherein,
for dark side direction instrument coefficient,
。
7. formation resistivity measuring method as claimed in claim 5, utilizes described pattern 2 to combine with described mode 3, can obtain shallow side direction apparent resistivity:
Wherein,
for shallow side direction instrument coefficient,
。
8., as the formation resistivity measuring method in claim 5 ~ 7 as described in any one, the data gathered under can utilizing described 3 kinds of mode of operations calculate dark, the shallow side direction apparent resistivity curve of following high-resolution:
Wherein,
,
be respectively high-resolution dark, shallow side direction instrument coefficient,
。
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| CN106837320A (en) * | 2017-01-05 | 2017-06-13 | 杭州迅美科技有限公司 | A kind of the Electrical imaging measurement apparatus and method of the backflow of pole plate internal emission |
| CN107524438A (en) * | 2017-07-26 | 2017-12-29 | 杭州迅美科技有限公司 | Possess delineation ability crosses drill collar azimuthal array lateralog and its measuring method |
| CN107762497A (en) * | 2017-09-20 | 2018-03-06 | 中国石油天然气集团公司 | One kind is with brill electrode current type al-lateral resistivity logger and method |
| CN107816344A (en) * | 2017-09-20 | 2018-03-20 | 中国石油天然气集团公司 | One kind is with brill side electrode array main screen integral electrode structure and preparation method thereof |
| CN108254620A (en) * | 2017-12-21 | 2018-07-06 | 中国电子科技集团公司第二十二研究所 | Resistivity measurement instrument |
| CN108729898A (en) * | 2017-04-17 | 2018-11-02 | 中国石油集团长城钻探工程有限公司 | Lateralog electrode system and lateralog |
| CN108729910A (en) * | 2017-04-17 | 2018-11-02 | 中国石油集团长城钻探工程有限公司 | Dual laterolog equipment is popped one's head in and the dual laterolog equipment with the probe |
| CN109138995A (en) * | 2018-08-13 | 2019-01-04 | 中国石油集团工程技术研究院有限公司 | When a kind of drilling tool rotates with boring apparent resistivity measuring system and method |
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| CN106837320A (en) * | 2017-01-05 | 2017-06-13 | 杭州迅美科技有限公司 | A kind of the Electrical imaging measurement apparatus and method of the backflow of pole plate internal emission |
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| CN108729910A (en) * | 2017-04-17 | 2018-11-02 | 中国石油集团长城钻探工程有限公司 | Dual laterolog equipment is popped one's head in and the dual laterolog equipment with the probe |
| CN109281661A (en) * | 2017-07-19 | 2019-01-29 | 中国石油化工股份有限公司 | A kind of dual laterolog quantitative evaluation method and device |
| CN109281661B (en) * | 2017-07-19 | 2021-09-14 | 中国石油化工股份有限公司 | Quantitative evaluation method and device for double-laterolog |
| CN107524438A (en) * | 2017-07-26 | 2017-12-29 | 杭州迅美科技有限公司 | Possess delineation ability crosses drill collar azimuthal array lateralog and its measuring method |
| CN107816344A (en) * | 2017-09-20 | 2018-03-20 | 中国石油天然气集团公司 | One kind is with brill side electrode array main screen integral electrode structure and preparation method thereof |
| CN107762497B (en) * | 2017-09-20 | 2020-12-01 | 中国石油天然气集团公司 | While-drilling electrode current type dual-lateral resistivity logging instrument and method |
| CN107762497A (en) * | 2017-09-20 | 2018-03-06 | 中国石油天然气集团公司 | One kind is with brill electrode current type al-lateral resistivity logger and method |
| CN108254620A (en) * | 2017-12-21 | 2018-07-06 | 中国电子科技集团公司第二十二研究所 | Resistivity measurement instrument |
| CN109138995A (en) * | 2018-08-13 | 2019-01-04 | 中国石油集团工程技术研究院有限公司 | When a kind of drilling tool rotates with boring apparent resistivity measuring system and method |
| CN114198097A (en) * | 2022-02-18 | 2022-03-18 | 东营仪锦能源科技有限公司 | Drilling-following type double-laterolog instrument |
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