Electrical cased well-logging method
A technology for electrical logging and cased well, which is applied to wellbore/well components, measurement, and electrical/magnetic detection for logging records, etc., can solve problems such as distortion of resistivity measurement results, and simplify equipment and methods. its own effect
Inactive Publication Date: 2012-04-25
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Problems solved by technology
[0004] The closest prior art method has the disadvantage that when there are coupling buckles in the space between the probe electrodes that have a linear resistivity different from that of the casing string, the resistivity measurements of the bedrock around the string will be different. There is obvious distortion
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[0025] The claimed method is performed as follows:
[0026] figure 1 The block diagram in shows the upper current electrode 1, the upper measuring electrode 2, the central measuring electrode 3, and the lower measuring electrode 4, the lower current electrode 5 of the measuring probe 6, all of which are attached to the metal on the inner surface of the casing string 7. Well 9 is surrounded by bedrock 10 .
[0027] The measuring probe 6 comprises measuring devices 11 and 12 for measuring the intensity of the current, electronic switches 13 and 14 for continuously applying current to the electrodes 1 and 5 respectively, and measuring devices 15, 16, 17, 18 and 19.
[0028] An alternator 20 is located at the surface and is connected to the measuring probes by connecting lines 21 . The potential of the central measuring electrode 3 is measured by the measuring device 17 through an independent connecting line 22 relative to a remote ground electrode 23 located on the earth's su...
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The invention relates to the geophysical examination of wells and can be used for determining the electrical resistivity of rock beds surrounding a well cased in a metal column. The inventive method consists in using a sonde embodied in the form of two current electrodes located on the opposite sides with respect of at least thee measuring electrodes, in alternately supplying electric current, inmeasuring, by means of a measuring devices, during each current supply, a supplied current, a potential on a central measuring electrode and the potential difference between the outer measuring electrodes and the central electrode, in using the specific electrical resistivity of the rock beds surrounding the cased well in the form of the electrical parameter of the electrical logging of the casedwells, in forming a measuring circuit according to the resistivity pattern of the layers of the rock beds surrounding the well and of those sections of a casing string which are provided with the collars, wherein the sonde, whose measuring electrodes are spaced without respecting equidistance requirements and current electrodes are embodied in such a way that they can be used in the form of measuring electrodes is applied. In addition, the inventive method also consists in measuring the potential difference of an electric field between the current electrode, to which the current is not supplied at the present switching, and the central measuring electrode, by means of additional measuring devices, and in determining a specific electrical resistivity according to a formula referred thereto.
Description
technical field [0001] The present invention relates to geophysical inspection of wells and can be used to determine the resistivity of formation beds surrounding wells that are casing within metal strings. Background technique [0002] The prior art method closest to the present invention in terms of technical idea is a method for electrical logging of a cased hole, including applying an electric current, using multiple Electrode probe (sonde) to measure the electric field potential, wherein said at least two current electrodes are remote from the measuring electrode area and placed symmetrically with respect to the central measuring electrode (see priority date 20.02.2001, publication date 12.2001 10th Russian patent 2,176,802, IPC G01V3 / 20). Each current electrode is alternately supplied with current from the same source. Each time a current is applied, the electric field potential is measured at the point of contact between the central measuring electrode and the colum...
Claims
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IPC IPC(8): G01V3/20E21B47/00E21B47/10
CPCG01V3/20E21B47/102E21B47/113
Inventor V·V·塞莱布里安斯基V·I·宇克林
Owner LIABILITY INTERLOG