CN202645548U - High resolution bearing resistivity lateral logging instrument - Google Patents

Abstract

The utility model relates to a bearing lateral logging instrument and provides a high resolution bearing resistivity lateral logging instrument which mainly comprises a bearing electrode system and a measuring electronic circuit, wherein the electrode system is formed by a plurality of lateral electrode rings and bearing electrode rings M0, and the lateral electrode rings and the bearing electrode rings have different widths and are embedded on an insulation carrier. The center of the electrode system is M0, fourteen electrodes with different widths use the M0 as a symmetry axis and are arranged according to different intervals, and each of the homonym electrode rings is connected through wires in a short sub mode to keep equipotential; and each of the homonym electrode rings, bearing electrode rings, reference electrodes N and return circuits B are respectively connected with the measuring electronic circuit through wires. The high resolution bearing resistivity lateral logging instrument can simultaneously measure high resolution lateral curves and bearing lateral curves, and provides more abundant information for logging evaluation; and the high resolution bearing resistivity lateral logging instrument can recognize thin layers and thin interbeds with 0.2 millimeter thickness, provides effective logging curves for thin layer logging, and can effectively recognize fissures and karst caves.

Description

High-resolution azimuthal resistivity lateralog

Technical field

The utility model relates to a kind of direction lateral well-logging instrument, particularly relates to a kind of high-resolution azimuthal resistivity lateralog.

Background technology

Along with gradually intensification and the difficulty of In Oil Field Exploration And Development degree further strengthens, required precision to evaluating reservoir work is more and more higher, logging instrument need to have higher longitudinal frame and larger radial depth of investigetion, logger requires simultaneously to cover whole well, the directed ability of determining stratum characteristic, so that can measure more abundant formation information at aspects such as inhomogeneous formation, thin layers.

Original dual laterolog equipment can measure two deep and shallow resistivity curves, this information is that whole well is on the impact of measurement result, from metrical information, can't extract well week heterogeneous body information, the all scanning imageries of microresistivity scanner and well can well be to advancing medium analysis near the well, but all scanning imagery investigation depths of microresistivity scanner and well are very shallow, 12 azimuthal electrodes of high-resolution direction lateral well-logging instrument can obtain an azimuthal resistivity image, although the high-resolution azimuthal resistivity is lower than all scanning imaging instruments of well and little resistance scan imager resolution ratio, its investigation depth is considerably beyond all scanning imaging instruments of well and little resistance scan imager.Therefore high-resolution azimuthal resistivity imager is well week scanning imaging instrument and the replenishing of little resistance scan imager, utilize the azimuthal resistivity imager can crack identification, solution cavity, and then can carry out quantitative assessment.

The utility model content

The utility model is not enough for prior art, proposes a kind of high-resolution azimuthal resistivity logging instrument, can be applicable to all cracks of inclined shaft, high angle hole and horizontal well, thin interbed stratum and well and carries out accurately logging evaluation.

The technical scheme that the utility model adopts:

A kind of high-resolution azimuthal resistivity lateralog, mainly formed by azimuthal electrodes system and measurement electronic circuit, described electrode system is comprised of the lateral electrodes ring that is embedded in a plurality of different in width on the insulating carrier and azimuthal electrodes ring M0, electrode system central authorities are M0, the electrode retaining collar of 14 different in width is take M0 as axis of symmetry, according to different being spaced (selection at width and interval is take investigation depth 1.0m and resolution ratio as 0.2m as condition), each homonymy electrode ring keeps equipotential with wire short circuit; Described each homonymy electrode ring, azimuthal electrodes ring, reference electrode N and loop B respectively connect measuring circuit by wire, are mainly used in the well anisotropically measurement of layer resistivity of different azimuth on every side.

Described high-resolution azimuthal resistivity lateralog, insulating carrier is rubber bar or glass bar, azimuthal electrodes ring M0 is by 12 coil M0 ₁～M0 ₁₂Consist of (axial resolution is 60 °), the lateral electrodes ring is comprised of 14 coils of symmetric arrays, centered by the electrode retaining collar M0 at insulating carrier center, outwards is followed successively by A01, A01 ', A0 ^*, A0 ^*', A02, A02 ', M1, M1 ', A1, A1 ', A1*, A1* ', A2, A2 ', wherein A01, A01 ', A0 ^*, A0 ^*', A02, A02 ', M1, M1 ', A1, A1 ', A1*, A1* ', A2, A2 ' are respectively the homonymy electrode ring, and described each homonymy electrode ring keeps equipotential with the wire short circuit.

The beneficial effects of the utility model:

1, the utility model high-resolution azimuthal resistivity logging instrument, electrode system adopts by 14 electrode retaining collars and 12 azimuthal electrodes ring (M0 of being embedded in the symmetric arrays on rubber bar or the glass bar _1-12) design that consists of, can measure simultaneously high-resolution side direction curve and orientation side direction curve, the well logging information that more enriches is provided for logging evaluation.Quantitative is combined with the resolution ratio in orientation vertical, has increased the explanation degree of accuracy of formation evaluation, can identify thin layer and the thin interbed of surveying 0.2m, for the thin layer well logging provides effective log, and effectively crack identification and solution cavity.Measuring circuit produces the electric field of three different frequencies, guarantee to obtain High Resolution Dual Laterolog Logging curve and azimuthal resistivity well logging information when 12 azimuthal electrodes M0i sums are identical with 12 times M1 current potential, high resolution dual laterolog and orientation laterolog resolution ratio can reach 0.2m.

2, the utility model high-resolution azimuthal resistivity logging instrument, the electrode system design can shorten tool length, is more applicable for high angle hole and horizontal well.Instrument adopts digital focus pattern and hard focusing mode, compares original hard focus circuit collection capacity and increases, and certainty of measurement improves greatly, and metrical information is also abundanter.

Description of drawings

Fig. 1: high-resolution orientation laterolog device and use view thereof;

Fig. 2: high-resolution orientation side electrode array structure chart;

Fig. 3: azimuthal electrodes binds composition;

Fig. 4: high-resolution orientation side direction is measured electronic circuit embodiment schematic diagram.

The specific embodiment

Embodiment one: referring to Fig. 2.The utility model high-resolution azimuthal resistivity lateralog, formed by azimuthal electrodes system and measurement electronic circuit, be mainly used in the measuring well anisotropically measurement of layer resistivity of different azimuth on every side, the electrode system of described logging instrument is comprised of the lateral electrodes ring that is embedded in a plurality of different in width on the insulating carrier and azimuthal electrodes ring M0, electrode system central authorities are azimuthal electrodes ring M0, the lateral electrodes ring of 14 different in width is take M0 as axis of symmetry, according to different being spaced, the width of different lateral electrodes rings and the selection of arrangement pitch are take investigation depth 1.0m and resolution ratio as 0.2m as condition, and each homonymy electrode ring keeps equipotential with wire short circuit in the lateral electrodes ring; Described each homonymy electrode ring, azimuthal electrodes ring, reference electrode N and loop B connect the measurement electronic circuit by wire.Described insulating carrier is rubber bar or glass bar.

Fig. 2 is the concrete configuration of electrodes of high-resolution orientation side electrode array.

Embodiment two: referring to Fig. 2, Fig. 3.Present embodiment high-resolution azimuthal resistivity lateralog, azimuthal electrodes is arranged as shown in Figure 3, and azimuthal electrodes ring M0 is by 12 coil M0 ₁～M0 ₁₂Consist of, its axial resolution is 60 °, and single electrode retaining collar width is 20 degree, is 30 degree between each electrode retaining collar center.Adopt insulation materials to separate between each electrode retaining collar.

The lateral electrodes ring is comprised of 14 coils of symmetric arrays, centered by the electrode retaining collar M0 at insulating carrier center, outwards is followed successively by A01, A01 ', A0 ^*, A0 ^*', A02, A02 ', M1, M1 ', A1, A1 ', A1 ^*, A1 ^*', A2, A2 ', wherein A01, A01 ', A0 ^*, A0 ^*', A02, A02 ', M1, M1 ', A1, A1 ', A1 ^*, A1 ^*', A2, A2 ' are respectively the homonymy electrode ring, and described each homonymy electrode ring keeps equipotential with the wire short circuit.

The logging method of the utility model high-resolution azimuthal resistivity lateralog is as follows:

Fig. 1 is well logging apparatus and uses view.9 is measuring well among the figure, and 10 is stratum around the measuring well.

This device is made of high-resolution direction lateral well-logging instrument and remote measurement pipe nipple 6 etc., its middle high-resolution direction lateral well-logging instrument is comprised of orientation side electrode array and measurement electronic circuit, remote measurement pipe nipple 6, high-resolution orientation side electrode array 7, measuring electronic circuit 8 hangs in the measuring well by 7 core cables 4,7 core cables 4 twist on winch drum 2 by pulley 3 volumes, make remote measurement pipe nipple 6, high-resolution orientation side electrode array 7, electronic circuit 8 is along moving up and down in measuring well, winch drum 2 is parts of ground system 1, circuit loop electrode 11 places ground, at 7 core cables, 4 ends torpedo 5 is installed, as the reference potential electrode.Fig. 4 has provided high-resolution orientation side direction and has measured electronic circuit embodiment schematic diagram.

The utility model high-resolution azimuthal resistivity lateralog makes instrument be operated under following three kinds of patterns during use:

Pattern 1: proportion is that the down-hole power of 35Hz is added on bucking electrode A1, the A2, A1 (A1 ') and A2 (A2 ') simultaneously power supply, the loop is B.Require A1 this moment ^*(A1 ^*'), A2 (A2 ') current potential equates.Measure the potential difference between 12 azimuthal electrodes and the M1, be designated as I=1 ..., 12.Measure A0 ^*And the potential difference between the N is designated as

Measure A0 ^*And the potential difference between the N is designated as

Measure 12 azimuthal electrodes and A0 ^*Between potential difference, be designated as

I=1 ..., 12;

Pattern 2: proportion is that the down-hole power of 140Hz is added on the bucking electrode A1, A1 (A1 ') power supply, and the loop is A2 (A2 ').Measure the potential difference between 12 azimuthal electrodes and the M1, be designated as

I=1 ..., 12.Measure A0 ^*And the potential difference between the N is designated as

Measure 12 azimuthal electrodes and A0 ^*Between potential difference, be designated as I=1 ..., 12.；

Mode 3: proportion is that the down-hole power of 280Hz is added on the master metal electrode A 0, simultaneously power supply of A01 (A01 '), A02 (A02 '), and the loop is A1 (A1 ') and A2 (A2 '), requires A1 this moment ^*(A1 ^*'), A2 (A2 ') current potential equates.Measure the potential difference between 12 azimuthal electrodes and the M1, be designated as

I=1 ..., 12.Measure the total current that A01 (A01 '), A02 (A02 ') flow out, be designated as Measure A0 ^*And the potential difference between the N is designated as

Measure 12 azimuthal electrodes and A0 ^*Between potential difference, be designated as

I=1 ..., 12.

Utilization collects to such an extent that signal carries out computation of apparent resistivity:

The dark side direction of high-resolution:

$R_{\mathrm{hlld}}=\frac{k_{\mathrm{hlld}}({\mathrm{\&Delta;V}}_{{A0}^{*}N}^3-{\mathrm{\&Delta;V}}_{{A0}^{*}\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120608162720.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^1)}{I_0^3}$ (pattern 1 is synthetic with mode 3)

The shallow side direction of high-resolution:

$R_{\mathrm{hlls}}=\frac{k_{\mathrm{hlls}}({\mathrm{\&Delta;V}}_{{A0}^{*}N}^3-{\mathrm{\&Delta;V}}_{{A0}^{*}\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120608162720.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^1)}{I_0^3}$ (pattern 2 is synthetic with mode 3)

Wherein, K _Hlld, K _HllsRepresent respectively the dark side electrode array coefficient of high-resolution, the shallow side electrode array coefficient of high-resolution.R _Hlld, R _HllsRepresent respectively high-resolution deep lateral apparent resistivity, the shallow side direction apparent resistivity of high-resolution.

Article 12, the dark side direction in orientation:

${\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=({\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-{\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120608162720.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^{\text{1}})$

$R_{\mathrm{dazi}}=\frac{k_{\mathrm{alld}}({\mathrm{\&Delta;V}}_{{A0}^{*}N}^3-{\mathrm{\&Delta;V}}_{{A0}^{*}\mathrm{<figure-callout\; id="1"\; label="N"\; filenames="120608162720.png"\; state="\{\{state\}\}">N</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^1)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}{{\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}$

(pattern 1 is synthetic with mode 3)

Article 12, the shallow side direction in orientation:

${\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=({\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-{\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="120608162720.png"\; state="\{\{state\}\}">j</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^{\text{2}})$

$R_{\mathrm{sazi}}=\frac{k_{\mathrm{alls}}({\mathrm{\&Delta;V}}_{{A0}^{*}N}^3-{\mathrm{\&Delta;V}}_{{A0}^{*}\mathrm{<figure-callout\; id="2"\; label="N"\; filenames="120608162720.png"\; state="\{\{state\}\}">N</figure-callout>}}^2*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^2)}{I_0^3}*\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}{{\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}$ (pattern 2 is synthetic with mode 3)

K _Alld, K _AllsRepresent respectively the dark side electrode array coefficient in orientation, the shallow side electrode array coefficient in orientation.R _Dazi, R _SaziRepresent respectively orientation deep lateral apparent resistivity, the shallow side direction apparent resistivity in orientation.

Mud resistivity

${\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}=({\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}^3-{\mathrm{\&Delta;V}}_{{\mathrm{MA}0}^{*}\mathrm{az},\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="120608162720.png"\; state="\{\{state\}\}">j</figure-callout>}}^1*\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},\mathrm{<figure-callout\; id="3"\; label="i"\; filenames="120608162720.png"\; state="\{\{state\}\}">i</figure-callout>}}^3/\underset{i=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{\&Delta;V}}_{\mathrm{MNaz},i}^{\text{1}})$

$R_m=K_m\frac{\underset{j=1}{\overset{12}{\mathrm{\&Sigma;}}}{\mathrm{CV}}_{{\mathrm{MA}0}^{*}\mathrm{az},j}}{12*I_0^3}$ (pattern 1 is synthetic with mode 3)

Wherein, K _m, R _mRepresent respectively mud resistivity calibration factor, mud apparent resistivity.

Claims (2)

1. high-resolution azimuthal resistivity lateralog, formed by azimuthal electrodes system and measurement electronic circuit, be mainly used in the measuring well anisotropically measurement of layer resistivity of different azimuth on every side, it is characterized in that: the electrode system of described logging instrument is comprised of the lateral electrodes ring that is embedded in a plurality of different in width on the insulating carrier and azimuthal electrodes ring M0, electrode system central authorities are azimuthal electrodes ring M0, the lateral electrodes ring of 14 different in width is take M0 as axis of symmetry, according to different being spaced, the width of different lateral electrodes rings and the selection of arrangement pitch are take investigation depth 1.0m and resolution ratio as 0.2m as condition, and each homonymy electrode ring keeps equipotential with wire short circuit in the lateral electrodes ring; Described each homonymy electrode ring, azimuthal electrodes ring, reference electrode N and loop B connect the measurement electronic circuit by wire.

2. high-resolution azimuthal resistivity lateralog according to claim 1, it is characterized in that: insulating carrier is rubber bar or glass bar, azimuthal electrodes ring M0 is by 12 coil M0 ₁～M0 ₁₂Consist of, its axial resolution is 60 ^o, the lateral electrodes ring is comprised of 14 coils of symmetric arrays, centered by the electrode retaining collar M0 at insulating carrier center, outwards is followed successively by lateral electrodes ring A01, A01 ^', lateral electrodes ring A0 ^*, A0 ^{* '}, lateral electrodes ring A02, A02 ^', lateral electrodes ring M1, M1 ^', lateral electrodes ring A1, A1 ^', lateral electrodes ring A1 ^*, A1 ^{* '}, lateral electrodes ring A2, A2 ^', wherein lateral electrodes ring A01, A01 ^', lateral electrodes ring A0 ^*, A0 ^{* '}, lateral electrodes ring A02, A02 ^', lateral electrodes ring M1, M1 ^', lateral electrodes ring A1, A1 ^', lateral electrodes ring A1 ^*, A1 ^{* '}, lateral electrodes ring A2, A2 ^'Be respectively the homonymy electrode ring, described each homonymy electrode ring keeps equipotential with the wire short circuit.

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