CN202645547U - High-resolution azimuthal resistivity dual laterolog tool - Google Patents

Abstract

The utility model relates to a high-resolution azimuthal resistivity dual laterolog tool, which includes an electrode system and a measuring circuit, wherein the electrode system is connected with the measuring circuit through a conducting wire and includes a reference electrode N, a circuit electrode B and 17 electrodes embedded on a vertical insulation rod, and the parts of the 17 electrodes in the middle are azimuthal electrodes; the insulation rod and the measuring circuit are hung in a borehole through a cable, the reference electrode N is mounted on the cable and close to one end of the cable hung with the insulation rod and the measuring circuit, and the circuit electrode B is placed on the ground; and the measuring circuit includes a mode 1 output module, a mode 2 output module, a mode 3 output module, a current measuring module, a voltage measuring module, a differential pressure measuring module and a signal generating processing module. The high-resolution azimuthal resistivity dual laterolog tool has high measuring precision and complete measuring functions.

Description

High-resolution azimuthal resistivity dual laterolog equipment

(1), technical field: the utility model relates to a kind of logging instrument, particularly relates to a kind of high-resolution azimuthal resistivity dual laterolog equipment.

(2), background technology: dual laterolog equipment has solved the logging problems on salt-water mud stratum after releasing effectively, and bilateral is compared three side direction to investigation depth and is greatly improved.But owing to not carrying out too large change between the two on the logging principle, bilateral is to surveying the still problem below the existence: 1) longitudinal frame is low, 2) lack directed information, and there is not the azimuth discrimination ability.The all scanning and imaging logging instruments of microresistivity scanning and imaging logging instrument and well can be analyzed near the medium well well, the information in reflection well week crack and cavity, but all there is the very shallow problem of investigation depth in all scanning imaging instruments of microresistivity scanning imaging instrument and well, near the well logging information of the rock of well can only be provided, can't detect the information of intermediate zone and undisturbed formation.

(3), utility model content:

The technical problems to be solved in the utility model is: overcome the defective of prior art, provide that a kind of certainty of measurement is high, the comprehensive high-resolution azimuthal resistivity of measurement function dual laterolog equipment.

The technical solution of the utility model:

A kind of high-resolution azimuthal resistivity dual laterolog equipment, contain electrode system and measuring circuit, electrode system is connected with measuring circuit by wire, be used near the anisotropically measurement of layer resistivity of different azimuth of well, electrode system contains reference electrode N, loop electrode B and is embedded in 17 electrodes on the insulating rod that vertically arranges; These 17 electrodes are respectively electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ', electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ' is sequentially arranged on the insulating rod from top to bottom, electrode A 2 and electrode A 2 ', electrode A 1* and electrode A 1* ', electrode A 1 and electrode A 1 ', electrode M2 and electrode M2 ', electrode M1 and electrode M1 ', electrode A 02 and electrode A 02 ', electrode A 0* and electrode A 0* ', electrode A 01 and electrode A 01 ' are eight pairs of homonymy electrodes, every pair of homonymy electrode is symmetrical arranged centered by electrode M0, and every pair of homonymy electrode is shorted together with wire, to keep equipotential; Electrode M0 is azimuthal electrodes; In well, reference electrode N is installed on the cable by cable suspension for insulating rod, measuring circuit, and the position of reference electrode N is near an end of cable suspension insulating rod and measuring circuit, and loop electrode B places ground; Measuring circuit contains pattern 1 output module, pattern 2 output modules, mode 3 output module, current measurement module, voltage measurement module, differential pressure measurement module and signal generation processing module; The output signal of pattern 1 output module flows to from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 ', is back to pattern 1 output module from loop electrode B; The output signal of pattern 2 output modules flows to from electrode A 1 and electrode A 1 ', is back to pattern 2 output modules from electrode A 2 and electrode A 2 '; The output signal of mode 3 output module flows to from electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ', is back to the mode 3 output module from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 '; Electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ' are shorted together with wire; The input of current measurement module is connected with electrode A 02; The input of voltage measurement module is connected with reference electrode N, electrode M1, electrode M1 '; The input of differential pressure measurement module is connected with electrode M0, electrode M1, electrode M1 ', electrode A 0* and electrode A 0*, electrode M2 is connected with electrode M2 and is connected; Current measurement module, voltage measurement module and differential pressure measurement module are connected output and are connected with the input of signal generation processing module, and the output of signal generation processing module and pattern 1 output module, pattern 2 output modules are connected input and are connected with the mode 3 output module.

Eight pairs of homonymy electrodes are eight pairs of homonymy electrode rings, and the width of eight pairs of homonymy electrode rings is different, and each is also different to the interval width between the homonymy electrode ring, and the width of two electrode retaining collars in the every pair of homonymy electrode ring is identical; By width and each selection to the width at interval between the homonymy electrode ring to every pair of homonymy electrode ring, can make the investigation depth when surveying is that 1.0m, resolution ratio are 0.2m.

Electrode M0 contains a main electrode ring and P identical coil, P identical coil is wrapped on the main electrode ring equably, P is the natural number more than or equal to 2, adopts insulation materials to separate between each coil, and the input of differential pressure measurement module is connected with P coil among the electrode M0.

P is 12, and the width at the interval between each coil is each loop length half (axial resolution that can make like this logging instrument is 60 °).

Insulating rod is rubber bar or glass bar.

The method of measuring resistivity of high-resolution azimuthal resistivity dual laterolog equipment is: be that the signal of 35Hz is added on electrode A 1, electrode A 1 ', electrode A 2, electrode A 2 ' and the loop electrode B with the frequency of pattern 1 output module output, keep electrode A 1* and electrode A 2 equipotentials, measure the potential difference between 12 coils and the electrode M1, be designated as

I=1 ..., 12, measure the potential difference between 12 coils and the electrode A 0*, be designated as

I=1 ..., 12, the potential difference between measurement electrode M2 and the electrode M1 is designated as

Potential difference between measurement electrode M1 and the reference electrode N is designated as

Be that the down-hole power of 140Hz is added on electrode A 1, electrode A 1 ', electrode A 2 and the electrode A 2 ' with the frequency of pattern 2 output modules output, measure the potential difference between 12 coils and the electrode M1, be designated as

I=1 ..., 12, measure the potential difference between 12 coils and the electrode A 0*, be designated as

I=1 ..., 12, the potential difference between measurement electrode A0* and the reference electrode N is designated as

Potential difference between measurement electrode M2 and the electrode M1 is designated as

Potential difference between measurement electrode M1 and the reference electrode N is designated as

Be that the down-hole power of 280Hz is added on electrode A 01, electrode A 01 ', electrode A 02, electrode A 02 ', electrode A 1, electrode A 1 ', electrode A 2 and the electrode A 2 ' with the frequency of mode 3 output module output, keep electrode A 1* and electrode A 2 equipotentials, measure the potential difference between 12 coils and the electrode M1, be designated as

I=1 ..., 12, measure the potential difference between 12 coils and the electrode A 0*, be designated as

, i=1 ..., 12, the potential difference between measurement electrode A0* and the reference electrode N is designated as Potential difference between measurement electrode M2 and the electrode M1 is designated as Potential difference between measurement electrode M1 and the reference electrode N is designated as

The total current that measurement electrode A01, electrode A 01 ', electrode A 02 and electrode A 02 ' flow out is designated as

Utilize the potential difference signal that collects under above 3 kinds of mode of operations and current signal can carry out the computation of apparent resistivity of mud near the stratum well or the well.

When measuring conventional dual laterolog response curve, the computation of apparent resistivity method on stratum is near the well:

$R_{\mathrm{LLD}}=\frac{K_{\mathrm{LLD}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^3/\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^1)}{I_0^3}$

$R_{\mathrm{LLS}}=\frac{K_{\mathrm{LLS}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^3/\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^2)}{I_0^3}$

Wherein, K _LLDRepresent dark side electrode array coefficient, K _LLSRepresent shallow side electrode array coefficient, R _LLDThe expression deep lateral apparent resistivity, R _LLSRepresent shallow side direction apparent resistivity.

When measuring the High Resolution Dual Laterolog Logging response curve, the computation of apparent resistivity method on stratum is near the well:

$R_{\mathrm{HLLD}}=\frac{K_{\mathrm{HLLD}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)}{I_0^3}$

$R_{\mathrm{HLLS}}=\frac{K_{\mathrm{HLLS}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)}{I_0^3}$

Wherein, K _HLLDThe dark side electrode array coefficient of expression high-resolution, K _HLLSThe shallow side electrode array coefficient of expression high-resolution, R _HLLDExpression high-resolution deep lateral apparent resistivity, R _HLLSThe shallow side direction apparent resistivity of expression high-resolution.

When measuring orientation side direction curve, the computation of apparent resistivity method on stratum is near the well:

${\mathrm{<figure-callout\; id="1"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}1}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120704185723.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)$

$R_{\mathrm{dazi}}=\frac{K_{\mathrm{alld}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}1}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j\; CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}}{{\mathrm{CV}}_{}}$

${\mathrm{<figure-callout\; id="2"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}2}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120704185723.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)$

$R_{\mathrm{sazi}}=\frac{K_{\mathrm{alls}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}2}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="2"\; label="j\; CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}}{{\mathrm{CV}}_{}}$

Wherein, K _AlldThe dark side electrode array coefficient in expression orientation, K _AllsThe shallow side electrode array coefficient in expression orientation, R _DaziExpression orientation deep lateral apparent resistivity, R _SaziThe shallow side direction apparent resistivity in expression orientation.

The computation of apparent resistivity method of mud is in the well:

${\mathrm{<figure-callout\; id="3"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}3}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120704185723.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)$

$R_m=K_m\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="3"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}3}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}{12*I_0^3}$

Wherein, K _mExpression mud resistivity calibration factor, R _mExpression mud apparent resistivity.

The beneficial effects of the utility model:

1, the utility model can be measured conventional resolution ratio bilateral simultaneously to curve, high resolution dual laterolog curve and orientation side direction curve, can analyze the stratum of different bed thickness, for logging evaluation provides abundant well logging information; Conventional dual laterolog curve can be identified the stratum of 0.4m, high-resolution well logging instrument can be identified thin layer and the thin interbed of 0.2m, for the thin layer well logging provides effective log, because direction lateral well-logging instrument has the function of measuring the orientation, thereby can effectively identify crack and the solution cavity in well week, and the function of subsidiary mud resistivity curve of the present utility model can be offered help for borehole correction.

2, the design of the electrode system of high-resolution azimuthal resistivity dual laterolog equipment of the present utility model can be shortened tool length, is more applicable for high angle hole and horizontal well.

3, high-resolution azimuthal resistivity dual laterolog equipment of the present utility model adopts digital focus pattern and hard focusing mode, compares existing hard focus circuit collection capacity and increases, and certainty of measurement improves greatly, and metrical information is also abundanter.

4, high-resolution azimuthal resistivity dual laterolog equipment of the present utility model can be combined with the resolution ratio in orientation vertical quantitatively, has increased the explanation degree of accuracy of formation evaluation.

(4), description of drawings:

Fig. 1 is the schematic block circuit diagram of high-resolution azimuthal resistivity dual laterolog equipment;

Fig. 2 is the structural representation of electrode M0;

Fig. 3 is the mode of operation schematic diagram of pattern 1 output module;

Fig. 4 is the mode of operation schematic diagram of pattern 2 output modules;

Fig. 5 is the mode of operation schematic diagram of mode 3 output module.

(5), the specific embodiment:

Referring to Fig. 1～Fig. 5, among the figure, high-resolution azimuthal resistivity dual laterolog equipment contains electrode system and measuring circuit, electrode system is connected with measuring circuit by wire, be used near the anisotropically measurement of layer resistivity of different azimuth of well, electrode system contains reference electrode N, loop electrode B and is embedded in 17 electrodes on the insulating rod that vertically arranges; These 17 electrodes are respectively electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ', electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ' is sequentially arranged on the insulating rod from top to bottom, electrode A 2 and electrode A 2 ', electrode A 1* and electrode A 1* ', electrode A 1 and electrode A 1 ', electrode M2 and electrode M2 ', electrode M1 and electrode M1 ', electrode A 02 and electrode A 02 ', electrode A 0* and electrode A 0* ', electrode A 01 and electrode A 01 ' are eight pairs of homonymy electrodes, every pair of homonymy electrode is symmetrical arranged centered by electrode M0, and every pair of homonymy electrode is shorted together with wire, to keep equipotential; Electrode M0 is azimuthal electrodes; In well, reference electrode N is installed on the cable by cable suspension for insulating rod, measuring circuit, and the position of reference electrode N is near an end of cable suspension insulating rod and measuring circuit, and loop electrode B places ground; Measuring circuit contains pattern 1 output module, pattern 2 output modules, mode 3 output module, current measurement module, voltage measurement module, differential pressure measurement module and signal generation processing module; The output signal of pattern 1 output module flows to from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 ', is back to pattern 1 output module from loop electrode B; The output signal of pattern 2 output modules flows to from electrode A 1 and electrode A 1 ', is back to pattern 2 output modules from electrode A 2 and electrode A 2 '; The output signal of mode 3 output module flows to from electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ', is back to the mode 3 output module from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 '; Electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ' are shorted together with wire; The input of current measurement module is connected with electrode A 02; The input of voltage measurement module is connected with reference electrode N, electrode M1, electrode M1 '; The input of differential pressure measurement module is connected with electrode M0, electrode M1, electrode M1 ', electrode A 0* and electrode A 0*, electrode M2 is connected with electrode M2 and is connected; Current measurement module, voltage measurement module and differential pressure measurement module are connected output and are connected with the input of signal generation processing module, and the output of signal generation processing module and pattern 1 output module, pattern 2 output modules are connected input and are connected with the mode 3 output module.

Eight pairs of homonymy electrodes are eight pairs of homonymy electrode rings, and the width of eight pairs of homonymy electrode rings is different, and each is also different to the interval width between the homonymy electrode ring, and the width of two electrode retaining collars in the every pair of homonymy electrode ring is identical; By width and each selection to the width at interval between the homonymy electrode ring to every pair of homonymy electrode ring, can make the investigation depth when surveying is that 1.0m, resolution ratio are 0.2m.

Electrode M0 contains 1,12 identical coil 1 of a main electrode ring and 12 identical coils and is wrapped in equably on the main electrode ring, adopts insulation materials to separate between each coil 1, and the input of differential pressure measurement module is connected with 12 coils 1 among the electrode M0.

The width at the interval 2 between each coil 1 is each coil 1 length half (axial resolution that can make like this logging instrument is 60 °).

Insulating rod is rubber bar.

The method of measuring resistivity of high-resolution azimuthal resistivity dual laterolog equipment is specially: be that the signal of 35Hz is added on electrode A 1, electrode A 1 ', electrode A 2, electrode A 2 ' and the loop electrode B with the frequency of pattern 1 output module output, keep electrode A 1* and electrode A 2 equipotentials, measure the potential difference between 12 coils 1 and the electrode M1, be designated as

I=1 ..., 12, measure the potential difference between 12 coils 1 and the electrode A 0*, be designated as

, i=1 ..., 12, the potential difference between measurement electrode M2 and the electrode M1 is designated as

Potential difference between measurement electrode M1 and the reference electrode N is designated as

Be that the down-hole power of 140Hz is added on electrode A 1, electrode A 1 ', electrode A 2 and the electrode A 2 ' with the frequency of pattern 2 output modules output, measure the potential difference between 12 coils 1 and the electrode M1, be designated as

I=1 ..., 12, measure the potential difference between 12 coils 1 and the electrode A 0*, be designated as

, i=1 ..., 12, the potential difference between measurement electrode A0* and the reference electrode N is designated as Potential difference between measurement electrode M2 and the electrode M1 is designated as

Potential difference between measurement electrode M1 and the reference electrode N is designated as

Be that the down-hole power of 280Hz is added on electrode A 01, electrode A 01 ', electrode A 02, electrode A 02 ', electrode A 1, electrode A 1 ', electrode A 2 and the electrode A 2 ' with the frequency of mode 3 output module output, keep electrode A 1* and electrode A 2 equipotentials, measure the potential difference between 12 coils 1 and the electrode M1, be designated as

, i=1 ..., 12, measure the potential difference between 12 coils 1 and the electrode A 0*, be designated as , i=1 ..., 12, the potential difference between measurement electrode A0* and the reference electrode N is designated as

, the potential difference between measurement electrode M2 and the electrode M1 is designated as

Potential difference between measurement electrode M1 and the reference electrode N is designated as

The total current that measurement electrode A01, electrode A 01 ', electrode A 02 and electrode A 02 ' flow out is designated as

Utilize the potential difference signal that collects under above 3 kinds of mode of operations and current signal can carry out the computation of apparent resistivity of mud near the stratum well or the well.

When measuring conventional dual laterolog response curve, the computation of apparent resistivity method on stratum is near the well:

$R_{\mathrm{LLD}}=\frac{K_{\mathrm{LLD}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^3/\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^1)}{I_0^3}$

$R_{\mathrm{LLS}}=\frac{K_{\mathrm{LLS}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^3/\mathrm{\&Delta;}{u}_{M2\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120704185723.png"\; state="\{\{state\}\}">M</figure-callout>}1}^2)}{I_0^3}$

Wherein, K _LLDRepresent dark side electrode array coefficient, K _LLSRepresent shallow side electrode array coefficient, R _LLDThe expression deep lateral apparent resistivity, R _LLSRepresent shallow side direction apparent resistivity.

When measuring the High Resolution Dual Laterolog Logging response curve, the computation of apparent resistivity method on stratum is near the well:

$R_{\mathrm{HLLD}}=\frac{K_{\mathrm{HLLD}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)}{I_0^3}$

$R_{\mathrm{HLLS}}=\frac{K_{\mathrm{HLLS}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)}{I_0^3}$

Wherein, K _HLLDThe dark side electrode array coefficient of expression high-resolution, K _HLLSThe shallow side electrode array coefficient of expression high-resolution, R _HLLDExpression high-resolution deep lateral apparent resistivity, R _HLLSThe shallow side direction apparent resistivity of expression high-resolution.

When measuring orientation side direction curve, the computation of apparent resistivity method on stratum is near the well:

${\mathrm{<figure-callout\; id="1"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}1}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120704185723.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)$

$R_{\mathrm{dazi}}=\frac{K_{\mathrm{alld}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="1"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}1}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j\; CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}}{{\mathrm{CV}}_{}}$

${\mathrm{<figure-callout\; id="2"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}2}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)$

$R_{\mathrm{sazi}}=\frac{K_{\mathrm{alls}}(\mathrm{\&Delta;}{u}_{M1N}^3-\mathrm{\&Delta;}{u}_{M1\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120704185723.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^2)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="2"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}2}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="2"\; label="j\; CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}}{{\mathrm{CV}}_{}}$

Wherein, K _AlldThe dark side electrode array coefficient in expression orientation, K _AllsThe shallow side electrode array coefficient in expression orientation, R _DaziExpression orientation deep lateral apparent resistivity, R _SaziThe shallow side direction apparent resistivity in expression orientation.

The computation of apparent resistivity method of mud is in the well:

${\mathrm{<figure-callout\; id="3"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}3}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=(\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-\mathrm{\&Delta;}{u}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120704185723.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{u}_{\mathrm{MNaz},i}^1)$

$R_m=K_m\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{<figure-callout\; id="3"\; label="CV"\; filenames="120704185723.png"\; state="\{\{state\}\}">CV</figure-callout>}3}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}{12*I_0^3}$

Wherein, K _mExpression mud resistivity calibration factor, R _mExpression mud apparent resistivity.

Claims (5)

1. high-resolution azimuthal resistivity dual laterolog equipment, contain electrode system and measuring circuit, electrode system is connected with measuring circuit by wire, it is characterized in that: electrode system contains reference electrode N, loop electrode B and is embedded in 17 electrodes on the insulating rod that vertically arranges; These 17 electrodes are respectively electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ', electrode A 2, electrode A 1*, electrode A 1, electrode M2, electrode M1, electrode A 02, electrode A 0*, electrode A 01, electrode M0, electrode A 01 ', electrode A 0* ', electrode A 02 ', electrode M1 ', electrode M2 ', electrode A 1 ', electrode A 1* ', electrode A 2 ' is sequentially arranged on the insulating rod from top to bottom, electrode A 2 and electrode A 2 ', electrode A 1* and electrode A 1* ', electrode A 1 and electrode A 1 ', electrode M2 and electrode M2 ', electrode M1 and electrode M1 ', electrode A 02 and electrode A 02 ', electrode A 0* and electrode A 0* ', electrode A 01 and electrode A 01 ' are eight pairs of homonymy electrodes, every pair of homonymy electrode is symmetrical arranged centered by electrode M0, and every pair of homonymy electrode is shorted together with wire; Electrode M0 is azimuthal electrodes; In well, reference electrode N is installed on the cable by cable suspension for insulating rod, measuring circuit, and the position of reference electrode N is near an end of cable suspension insulating rod and measuring circuit, and loop electrode B places ground; Measuring circuit contains pattern 1 output module, pattern 2 output modules, mode 3 output module, current measurement module, voltage measurement module, differential pressure measurement module and signal generation processing module; The output signal of pattern 1 output module flows to from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 ', is back to pattern 1 output module from loop electrode B; The output signal of pattern 2 output modules flows to from electrode A 1 and electrode A 1 ', is back to pattern 2 output modules from electrode A 2 and electrode A 2 '; The output signal of mode 3 output module flows to from electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ', is back to the mode 3 output module from electrode A 1, electrode A 1 ', electrode A 2 and electrode A 2 '; Electrode A 01, electrode A 01 ', electrode A 02 and electrode A 02 ' are shorted together with wire; The input of current measurement module is connected with electrode A 02; The input of voltage measurement module is connected with reference electrode N, electrode M1, electrode M1 '; The input of differential pressure measurement module is connected with electrode M0, electrode M1, electrode M1 ', electrode A 0* and electrode A 0*, electrode M2 is connected with electrode M2 and is connected; Current measurement module, voltage measurement module and differential pressure measurement module are connected output and are connected with the input of signal generation processing module, and the output of signal generation processing module and pattern 1 output module, pattern 2 output modules are connected input and are connected with the mode 3 output module.

2. high-resolution azimuthal resistivity dual laterolog equipment according to claim 1, it is characterized in that: described eight pairs of homonymy electrodes are eight pairs of homonymy electrode rings, the width of eight pairs of homonymy electrode rings is different, each is also different to the interval width between the homonymy electrode ring, and the width of two electrode retaining collars in the every pair of homonymy electrode ring is identical.

3. high-resolution azimuthal resistivity dual laterolog equipment according to claim 1, it is characterized in that: described electrode M0 contains a main electrode ring and P identical coil, P identical coil is wrapped on the main electrode ring equably, P is the natural number more than or equal to 2, adopt insulation materials to separate between each coil, the input of differential pressure measurement module is connected with P coil among the electrode M0.

4. high-resolution azimuthal resistivity dual laterolog equipment according to claim 3, it is characterized in that: described P is 12, the width at the interval between each coil is half of each loop length.

5. high-resolution azimuthal resistivity dual laterolog equipment according to claim 1, it is characterized in that: described insulating rod is rubber bar or glass bar.

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