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SU648928A1 - Method of detecting cracked collectors - Google Patents

Method of detecting cracked collectors

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Publication number
SU648928A1
SU648928A1 SU731957255A SU1957255A SU648928A1 SU 648928 A1 SU648928 A1 SU 648928A1 SU 731957255 A SU731957255 A SU 731957255A SU 1957255 A SU1957255 A SU 1957255A SU 648928 A1 SU648928 A1 SU 648928A1
Authority
SU
USSR - Soviet Union
Prior art keywords
probes
coils
resistance
readings
probe
Prior art date
Application number
SU731957255A
Other languages
Russian (ru)
Inventor
Игорь Михайлович Заслонов
Энгель Габдрауфович Урманов
Original Assignee
Трест "Татнефтегеофизика"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Трест "Татнефтегеофизика" filed Critical Трест "Татнефтегеофизика"
Priority to SU731957255A priority Critical patent/SU648928A1/en
Application granted granted Critical
Publication of SU648928A1 publication Critical patent/SU648928A1/en

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  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Claims (2)

(54) СПОСОБ ВЫДЕЛЕНИЯ ТРЕЩИННЫХ КОЛЛЕКТОРОВ ба электромагнитного каротажа вли ние сопротивлени  флюида, насьицающего трещины, будет максимально и в третьем спучае измер ема  величина будет хара1 териэовать какое-то проме жуточное значение сопротивлени . На этом различии сопротивление трещинных пород в зависимости от направлени , в котором оно измер ет с , и основан предлагаемый способ вьщелени  трещинных коллекторов. Целью изобретени   вл етс  одно временное получение информации о сопротивлении горных пород и наличии трещинных коллекторов. Это достигаетс  путем возбуждени и регистрации горизонтальной состав л юадей магнитного пол  в двух взаим перпендикул рных азимутах, затем ре гистрируют затухание горизонтально составл ющей магнитного пол , сравнивают результаты измерени  и по расхождению показаний выдел ют трещинные коллекторы. На чертеже показано размещение зондов: - генераторна , приемные катушки первого зонда; г - генераторна , п|и nlj - приемн катушки второго зонда; ll j L - рас сто ние между генераторной и первой приемной катушкой зондов; , Е рассто ние между приемными катушкам Генераторные; и приемные катушки первого и второго зондов расположены так, что ll L, е  С . Оси катушек первого зонда перпендикул рны ос м катушек второго зонда при любом положении прибора вскважине При измерени х генераторными катушками первого и второго зондов одновременно возбуждаютс  электромагнит ные пол , а приемными катушками регистрируетс  затухание горизонталь ной составл ющей магнитных полей н; Ht-H;, т,--)7 ц 11 которые пропорциональны сопротивлению горных пород в азимутально перХУХХУУХУУ ендикул рных плоскост х. Поскольку рассто ни  между катушками обоих ондов одинаковы, горизонтальна  и ертикальна  разрешающа  способность зондов одинакова . Расхождение показаний зондов может встречатьс  только в азимутально неоднородных средах , например в средах с направленной вертикальной трещиноватостью. Показани  обоих зондов во всем разрезе скважины будут одинаковы кроме трещинных коллекторов, против трещинных коллекторов, показани  одного зонда будут выше, другого ниже. С целью исключени  взаимного вли ни  зондов генераторные катушки питаютс  токами разной, но близкой частоты {например, 400 и 420 кгц). Приемные части зондов представл ют собой резонансные системы настроенные на эти частоты. При измерени х глубинный прибор .центрируетс  так, что оси обоих зондов наход тс  строго по оси скважины. Формула изобретени  Способ выделени  трещинных коллекторов , основанный на возбуждении электромагнитного пол  и измерении затухани  электромагнитного пол  между точками измерени , отличающийс  тем, что, с целью одновременного получени  информации о сопротивлении горных пород и наличии трещинных коллекторов, возбуждают электромагнитное поле в двух взаимно перпендикул рных азимутах, регистрируют затухание горизонтальной составл ющей магнитного пол , сравнивают результаты измерений и по расхождению показаний выдел ют трещинные коллекторы. Источники информации, прин тые во внимание при экспертизе 1.Патент США 3510757, кл. 324-6, 1970. (54) THE METHOD OF ISOLATING CRACKED COLLECTORS OF ELECTRONIC LOGGING The influence of the resistance of a fluid that builds up a crack will be maximal and in the third case the measured value will characterize some intermediate value of resistance. On this difference, the resistance of fracture rocks depending on the direction in which it measures c, and the proposed method for cleavage of fractured reservoirs is based. The aim of the invention is to simultaneously obtain information on the resistance of rocks and the presence of fractured reservoirs. This is achieved by exciting and registering the horizontal composition of the magnetic field in two mutually perpendicular azimuths, then the attenuation of the horizontal component of the magnetic field is recorded, the measurement results are compared, and the fracture reservoirs are separated from the readings. The drawing shows the placement of the probes: - generator, receiving coils of the first probe; g - generator, p | and nlj - receiving coil of the second probe; ll j L is the distance between the generator and the first receiving coil of the probes; , E is the distance between the receiving coils of the generator; and the receiving coils of the first and second probes are arranged so that ll L, e С. The axes of the coils of the first probe are perpendicular to the axes of the coils of the second probe at any position of the instrument in the borehole. When measuring with the generating coils of the first and second probes, electromagnetic fields are simultaneously excited, and the receiving coils register the attenuation of the horizontal component of the magnetic fields H; Ht-H ;, t, -) 7 c 11 which are proportional to the resistance of the rocks in azimuthally perChHHUHUHUU of the diagonal planes. Since the distances between the coils of both onds are the same, the horizontal and the vertical resolution of the probes are the same. The discrepancy between the readings of the probes can only occur in azimuthally inhomogeneous media, for example, in media with directional vertical fracturing. The readings of both probes throughout the borehole section will be the same except for fractured reservoirs, against fractured reservoirs, the readings of one probe will be higher, the other will be lower. In order to eliminate the mutual influence of the probes, the generator coils are fed by currents of different but close frequencies (for example, 400 and 420 kHz). The receiving parts of the probes are resonant systems tuned to these frequencies. When measuring, a deep hole device is centered so that the axes of both probes are strictly along the axis of the well. Claims The method for separating fractured reservoirs based on excitation of an electromagnetic field and measuring the attenuation of an electromagnetic field between measurement points, characterized in that, in order to simultaneously obtain information about the resistance of rocks and the presence of fractured collectors, excite an electromagnetic field in two mutually perpendicular azimuths, the attenuation of the horizontal component of the magnetic field is recorded, the measurement results are compared and, according to the divergence of the readings, fracture ollektory. Sources of information taken into account in the examination 1. US patent 3510757, cl. 324-6, 1970. 2.Авторское свидетельство СССР №236387 кл. G 01 V 3/18. X у У: X X X У X У X. У.2. USSR author's certificate №236387 cl. G 01 V 3/18. X y Y: X X X Y X Y X. Y.
SU731957255A 1973-08-31 1973-08-31 Method of detecting cracked collectors SU648928A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU731957255A SU648928A1 (en) 1973-08-31 1973-08-31 Method of detecting cracked collectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU731957255A SU648928A1 (en) 1973-08-31 1973-08-31 Method of detecting cracked collectors

Publications (1)

Publication Number Publication Date
SU648928A1 true SU648928A1 (en) 1979-02-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU731957255A SU648928A1 (en) 1973-08-31 1973-08-31 Method of detecting cracked collectors

Country Status (1)

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SU (1) SU648928A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4302722A (en) 1979-06-15 1981-11-24 Schlumberger Technology Corporation Induction logging utilizing resistive and reactive induced signal components to determine conductivity and coefficient of anisotropy
US4302723A (en) * 1979-06-15 1981-11-24 Schlumberger Technology Corporation Apparatus and method for determining dip and/or anisotropy of formations surrounding a borehole
US4319191A (en) * 1980-01-10 1982-03-09 Texaco Inc. Dielectric well logging with radially oriented coils
US4367439A (en) * 1979-03-13 1983-01-04 Fraser Douglas C Airborne geophysical surveying system using multiple coil pairs
US4636731A (en) * 1984-12-31 1987-01-13 Texaco Inc. Propagation anisotropic well logging system and method
US5406206A (en) * 1991-05-28 1995-04-11 Schlumberger Technology Corporation Method of evaluating a geological formation using a logging tool including slot antenna having two nonparallel elements

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367439A (en) * 1979-03-13 1983-01-04 Fraser Douglas C Airborne geophysical surveying system using multiple coil pairs
US4302722A (en) 1979-06-15 1981-11-24 Schlumberger Technology Corporation Induction logging utilizing resistive and reactive induced signal components to determine conductivity and coefficient of anisotropy
US4302723A (en) * 1979-06-15 1981-11-24 Schlumberger Technology Corporation Apparatus and method for determining dip and/or anisotropy of formations surrounding a borehole
US4319191A (en) * 1980-01-10 1982-03-09 Texaco Inc. Dielectric well logging with radially oriented coils
US4636731A (en) * 1984-12-31 1987-01-13 Texaco Inc. Propagation anisotropic well logging system and method
US5406206A (en) * 1991-05-28 1995-04-11 Schlumberger Technology Corporation Method of evaluating a geological formation using a logging tool including slot antenna having two nonparallel elements

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