Array-type lateral well logger with different layering powers

A logging tool and array technology, which is applied in the direction of electrical/magnetic detection for logging records, can solve the problems of inability to comprehensively and accurately analyze the distribution of oil layers, and inability to measure thin geological layers.

Inactive Publication Date: 2002-08-28
中国石油集团长城钻探工程有限公司测井公司
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Problems solved by technology

For example, the array lateral logging tool developed by Schlumberger Logging Company in France can obtain six curves with six detection degrees, but only

Method used

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  • Array-type lateral well logger with different layering powers
  • Array-type lateral well logger with different layering powers
  • Array-type lateral well logger with different layering powers

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Experimental program
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Embodiment Construction

[0017] Fig. 1 schematically shows the electrode distribution with refocusing capability of the present invention. 6 groups of shielding electrodes A6 and A6', A5 and A5', A4 and A4', A3 and A3', A2 and A2', A1 and A1' are symmetrically distributed on both sides of the main electrode group A01, A01', A00, Each group of shielding electrodes, such as A6 and A6', are connected by wires (not shown in the figure). The role of the shielding electrode is to emit the first working signal (shielding current) to form a focused electric field for the main electrode group. The main electrode group includes a central electrode A00 and a set of secondary electrodes A01, A01' distributed on both sides of the central electrode A00. The main electrode group generally acts on the focusing electric field of the shielding electrode to provide a layering ability, and the secondary electrodes A01 and A01' on both sides of the central electrode A00 provide a focusing electric field to the main elect...

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Abstract

The ivnention relates to an array logging tool in the side direction with various layering capabilities. It includes a multi-signal source, multiple groups of shielded electrodes, a monitoring device, a main electrode group, voltage measuring and processing set, and main electrode current detecting and processing set. The multi-signal source produces multiple working signals with different frequencies. Each group of shielded electrodes sends working signal to different layer of earth, meanwhile forms focusing electric field. The monitoring device receives and magnifies first working signal transmitted by multiple groups of shielded electrodes. The main electrode group includes a central electrode and multiple pairs of electrodes arranged outwards for signal refocusing. One measurement in the invention can obtain 12 apparent resistivity curves that describes the geology in detail, explains layers of earth in the orientation analysis, gives quantitative explanations to the problems of layers and alternate laminar layers.

Description

technical field [0001] The invention relates to an array lateral logging tool with multiple stratification capabilities, capable of obtaining logging curves with multiple stratification capabilities at one time. Background technique [0002] Lateral logging, also known as current focusing logging, belongs to electrical logging and is a major method in oilfield geophysical exploration. [0003] Under normal circumstances, the instrument is hoisted into the well through the armored cable and supplies power to the formation, and a return electrode is set at an infinity point away from the power supply electrode (actually, the return electrode is only more than 20 meters away from the power supply electrode). When there is only one power supply electrode, the emission current is not focused and the equipotential surface is spherical, and the logging method is lateral logging. [0004] When there are shielding electrodes above and below the transmitting electrode, the shielding ...

Claims

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Application Information

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IPC IPC(8): G01V3/24
Inventor 李兴年
Owner 中国石油集团长城钻探工程有限公司测井公司
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