CN202788829U - Microcolumn type focused logging instrument - Google Patents

Abstract

The utility model relates to a microcolumn type focused logging instrument. A measuring electronic circuit is connected with a microcolumn pole plate and a driving system of the microcolumn pole plate through connector clips positioned in the microcolumn type focused logging instrument; an electrode system pole plate structure comprises an H-shaped shielded electrode A0, a button-shaped measurement electrode A0*, supervision electrodes M and M' and shielded electrodes A1 and A1', wherein the supervision electrodes M and M' and the shielded electrodes A1 and A1' are symmetrically arranged on the waist parts of both sides of the H-shaped shielded electrode A0; measuring button electrodes B0, B1 and B2 are sequentially arranged at the lower part of the button-shaped measurement electrode A0* in the middle of the H-shaped shielded electrode A0; a measuring reference electrode N is arranged below the H-shaped shielded electrode A0; and a reflux electrode B is arranged at the periphery of the H-shaped shielded electrode A0. The microcolumn type focused logging instrument disclosed by the utility model is reasonable in design and simple in structure, achieves the purpose of realizing two instrumental functions, namely microspheric focusing and microresistivity, through the one-time logging of the focused logging instrument and can obtain three resistivity response curves through one-time measurement, quantitatively analyze the thickness and the resistivity of a mud cake and provide the conductivity and thickness information of the mud cake.

Description

A kind of microtrabeculae type focused logging device

Technical field

The utility model relates to a kind of microtrabeculae type focused logging device.

Background technology

The main purpose of oil-gas exploration is to seek the reservoir, because reservoir of oil and gas has good porosity and permeability, but not reservoir effective porosity is very low, almost is impermeable.Whether a main distinction point of reservoir and nonreservoir can form mud cake.Micronormal, microinverse curve can well be divided reservoir and nonreservoir.But micronormal, microinverse can only be analyzed reservoir and nonreservoir qualitatively, can't carry out quantitative analysis to the character of mud cake.Measure general microspheric focused logging device or the microresistivity device of adopting for flushed zone, the microspheric focused logging device can only measure flushed zone resistivity information, and microresistivity device can only carry out the qualitative analysis reservoir characteristics.

Along with appearance and the development of new technology, new technology, new material, reliability and the integrated level of downhole instrument string improve constantly, and the volume and weight of instrument string is to small and light future development.Development high reliability, high efficiency integrability downhole logging instruments are important directions of domestic and international logger development.

The utility model content

The utility model is not enough for prior art, proposes a kind of microtrabeculae type focused logging device, can obtain simultaneously many logs by once logging well, and realizes that microspheric focuses on and two kinds of functions of microresistivity device.

The technical scheme that the utility model adopts:

A kind of microtrabeculae type focused logging device, mainly comprise drive system (14), actuating arm (16) and the microtrabeculae pole plate (17) that is attached thereto and measure electronic circuit (9), wherein drive system (14) mainly is made of power source (13), catch bar (15), measuring electronic circuit (9) is connected with the drive system (14) of microtrabeculae pole plate (17) and pole plate by the instrument internal plug connector, the structure of described microtrabeculae pole plate comprises I-shaped bucking electrode A0, is located at the button-type measurement electrode A0 of described I-shaped bucking electrode A0 middle upper portion ^*And symmetrical monitor electrode M, M ' and bucking electrode A1, the A1 ' that is located at described I-shaped bucking electrode A0 both sides waist, described monitor electrode M, M ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' are arranged on monitor electrode M, the M ' outside of I-shaped bucking electrode A0 both sides waist, button-type measurement electrode A0 in the middle of described I-shaped bucking electrode A0 ^*The bottom is provided with successively measures button electrode B 0, B1 and B2, described B0, B1 and B2 link to each other with wire with A0* and guarantee equipotential, I-shaped bucking electrode A0 below is provided with witness mark electrode N, and I-shaped bucking electrode A0 is arranged with return electrode B outward, the isolation of insulating each other of each different name electrode.

Described microtrabeculae type focused logging device, described measurement electronic circuit comprises current feedback circuit, current measurement circuit, tension measuring circuit, and adopt the down-hole power of two kinds of different frequency power supply modes, for avoiding identical with other logger frequencies, select the underground power supply frequency to be respectively 510.5Hz, 1021Hz, when the underground power supply frequency selection purposes is 510.5Hz, be I-shaped bucking electrode A0 and measurement button electrode B 0 simultaneously, B1 and B2 power supply, B is return electrode, this moment I-shaped bucking electrode A0 and measure button electrode B 0, B1 and B2 equipotential connect, and utilize tension measuring circuit to measure between monitor electrode M and the reference electrode N and the potential difference between measurement electrode A0* and the monitor electrode M; Utilize simultaneously current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2; When the underground power supply frequency is 1021Hz, be bucking electrode A1 power supply, B is return electrode, this moment I-shaped bucking electrode A0 and be connected button electrode B 0, B1 and the connection of B2 equipotential, utilize tension measuring circuit to measure between monitor electrode M and the reference electrode N and the potential difference between measurement electrode A0* and the monitor electrode M, utilize simultaneously current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2.

Described microtrabeculae type focused logging device, the focused log of microtrabeculae shape is half-cylindrical focusing, the equipotential surface in its forward position, microtrabeculae pole plate center is half-cylindrical, and this type of focusing is fit to the geometry of well and mud cake, and the flushed zone resistivity measured value can better be provided.

The beneficial effects of the utility model:

1, the utility model microtrabeculae shape focused logging device is simple in structure, reasonable in design, has reached focused logging device and has once gone into the well and realize that microspheric focuses on and the purpose of microresistivity two kinds of instrumental functions.So that microtrabeculae type focused logging device can measure two more shallow curves of investigation depth, be used for reflecting the impact of mud cake, the curve that investigation depth is darker is used for reflecting the impact of flushed zone.

2, the utility model microtrabeculae type focused logging device, one-shot measurement can obtain three resistivity response curves, by Inversion Calculation, and can quantitative analysis cake thickness and mud cake resistivity, mud cake electrical conductivity and cake thickness information can be provided, also can obtain flushed zone resistivity.The focused log of microtrabeculae shape is half-cylindrical focusing, and the equipotential surface in its forward position, pole plate center is half-cylindrical, and this type of focusing is fit to the geometry of well and mud cake, and the flushed zone resistivity measured value can better be provided.

Description of drawings

Fig. 1: microtrabeculae type focused log composite set;

Fig. 2: microtrabeculae type focused logging device structural representation;

Fig. 3: microtrabeculae type focused logging device electrode system electrode plate structure schematic diagram;

Fig. 4: microtrabeculae type focused logging device is measured the electronic circuit embodiment;

Fig. 5: stratigraphic model schematic diagram.

The specific embodiment

Embodiment one: referring to Fig. 1～Fig. 3, a kind of microtrabeculae type focused logging device, mainly by drive system 14, actuating arm 16 and the microtrabeculae pole plate 17 that is attached thereto and measurement electronic circuit 9 consist of, wherein drive system 14 is mainly by power source 13, catch bar 15 consists of, when instrument is worked, actuating arm 16 opens, pole plate 17 is close to the measuring well borehole wall, measuring electronic circuit 9 is connected with the drive system 14 of microtrabeculae pole plate 17 and pole plate by the instrument internal plug connector, described microtrabeculae pole plate comprises I-shaped bucking electrode A0, is located at the button-type measurement electrode A0 of described I-shaped bucking electrode A0 middle upper portion ^*And symmetrical monitor electrode M, M ' and bucking electrode A1, the A1 ' that is located at described I-shaped bucking electrode A0 both sides waist, described monitor electrode M, M ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' are arranged on monitor electrode M, the M ' outside of I-shaped bucking electrode A0 both sides waist, button-type measurement electrode A0 in the middle of described I-shaped bucking electrode A0 ^*The bottom is provided with successively measures button electrode B 0, B1 and B2, described B0, B1 and B2 and A0 ^*Link to each other to guarantee equipotential with wire, I-shaped bucking electrode A0 below is provided with witness mark electrode N, and I-shaped bucking electrode A0 is arranged with return electrode B outward, the isolation of insulating each other of each different name electrode.

Embodiment two: referring to Fig. 1～Fig. 4, the measurement electronic circuit of microtrabeculae type focused logging device is by current feedback circuit, current measurement circuit, and tension measuring circuit consists of; Measurement electronic circuit in the present embodiment adopts the underground power supply of two kinds of different frequency power supply modes, for avoiding identical with other logger frequencies, selects the underground power supply frequency to be respectively 510.5Hz, 1021Hz.When the underground power supply frequency is 510.5Hz, be I-shaped bucking electrode A0 and measurement button electrode B 0, B1 and B2 power supply simultaneously, B is return electrode, this moment, I-shaped bucking electrode A0 and is connected button electrode B 0, B1 and the connection of B2 equipotential utilized between tension measuring circuit measurement monitor electrode M and the reference electrode N and measurement electrode A0 ^*And the potential difference between the monitor electrode M; Utilize simultaneously current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2; When the underground power supply frequency is 1021Hz, be bucking electrode A1 power supply, B is return electrode, and this moment, I-shaped bucking electrode A0 and is connected button electrode B 0, B1 and the connection of B2 equipotential utilized between tension measuring circuit measurement monitor electrode M and the reference electrode N and measurement electrode A0 ^*And the potential difference between the monitor electrode M utilizes current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2 simultaneously.

The focused log of microtrabeculae shape is half-cylindrical focusing, and the equipotential surface in its forward position, microtrabeculae pole plate center is half-cylindrical, and this type of focusing is fit to the geometry of well and mud cake, and the flushed zone resistivity measured value can better be provided.

Fig. 1 has provided a kind of well logging apparatus that can detect flushed zone stratum 11 features around the measuring well 10.This device comprises electronic circuit 9 etc. by remote measurement pipe nipple 6, microtrabeculae type focused logging device 7() consist of.The pole plate 17 of microtrabeculae type focused logging device 7 is close to the borehole wall when actuating arm opens, above-mentioned various piece hangs in the measuring well by 7 core cables 4,7 core cables 4 are wound on the winch drum 2 by pulley 3, this device is moved up and down along measuring eye, winch drum 2 is parts of ground system 1, current loop electrode 12 places ground, at 7 core cables, 4 ends torpedo 5 is installed.

The electronic circuit embodiment of instrument is seen Fig. 4.

The utility model microtrabeculae type focused logging device, detect the measuring well feature on flushed zone stratum on every side by following step:

Logging instrument is worked under following two kinds of supply frequency patterns respectively, obtains related data information:

Pattern 1:A0, B0, B1 and B2 power simultaneously, and the loop is B.Require A0, B0, B1 and B2 equipotential this moment.Measure the potential difference between M and the N, be designated as

While measurement electrode A0 ^*And the potential difference between the M is designated as Measure simultaneously the current value on B0, B1 and the B2, be designated as respectively

Pattern 2:A1 power supply, the loop is B.Require A0, B0, B1 and B2 equipotential this moment.Measure the potential difference between M and the N, be designated as Potential difference between measurement electrode A0* and the M is designated as simultaneously

Measure simultaneously the current value on B0, B1 and the B2, be designated as respectively

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

The B0 apparent resistivity:

$R_{B0}=k_{B0}\frac{{\mathrm{\&Delta;u}}_{\mathrm{MN}}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2{*\mathrm{\&Delta;u}}_{\mathrm{MN}}^2}{I_{B0}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2*I_{B0}^2}$

The B1 apparent resistivity:

${\mathrm{<figure-callout\; id="1"\; label="R\; B"\; filenames="120607184825.png"\; state="\{\{state\}\}">R</figure-callout>}}_B={\mathrm{<figure-callout\; id="1"\; label="k\; B"\; filenames="120607184825.png"\; state="\{\{state\}\}">k</figure-callout>}}_B\frac{{\mathrm{\&Delta;u}}_{\mathrm{MN}}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2{*\mathrm{\&Delta;u}}_{\mathrm{MN}}^2}{I_{B0}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2*I_{\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="120607184825.png"\; state="\{\{state\}\}">B</figure-callout>}1}^2}$

The B2 apparent resistivity:

${\mathrm{<figure-callout\; id="2"\; label="R\; B"\; filenames="120607184825.png"\; state="\{\{state\}\}">R</figure-callout>}}_B={\mathrm{<figure-callout\; id="2"\; label="k\; B"\; filenames="120607184825.png"\; state="\{\{state\}\}">k</figure-callout>}}_B\frac{{\mathrm{\&Delta;u}}_{\mathrm{MN}}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2{*\mathrm{\&Delta;u}}_{\mathrm{MN}}^2}{I_{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="120607184825.png"\; state="\{\{state\}\}">B</figure-callout>}2}^1-{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^1/{\mathrm{\&Delta;u}}_{A0*\mathrm{<figure-callout\; id="2"\; label="M"\; filenames="120607184825.png"\; state="\{\{state\}\}">M</figure-callout>}}^2*I_{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="120607184825.png"\; state="\{\{state\}\}">B</figure-callout>}2}^2}$

The inverse model scheme of instrument is seen Fig. 5, sets up one dimension axisymmetry stratigraphic model, utilizes Maxwell equation as can be known, and instrument response is satisfied

Wherein, σ is the electrical conductivity of diverse location, and u is current potential.

The electrical conductivity that makes mud cake is σ _m, cake thickness is h _m, the flushed zone electrical conductivity is σ _tResistivity response can be written as to utilize finite element analysis to analyze as can be known to the microtrabeculae focused logging device:

R＝f(σ _m,h _m,σ _t)

Utilize the principle of least square to find the solution min||R-f (σ _m, h _m, σ _t) ||

Can obtain the mud cake conductivityσ _m, cake thickness h _mAnd flushed zone resistivity σ _t, utilize formation parameter, by finite element analysis, can obtain the microresistivity log curve.

Claims (3)

1. microtrabeculae type focused logging device, comprise drive system (14), actuating arm (16) and the microtrabeculae pole plate (17) that is attached thereto and measure electronic circuit (9), wherein drive system (14) mainly is made of power source (13), catch bar (15), measuring electronic circuit (9) is connected with the drive system (14) of microtrabeculae pole plate (17) and pole plate by the instrument internal plug connector, it is characterized in that: the structure of described microtrabeculae pole plate comprises I-shaped bucking electrode A0, is located at the button-type measurement electrode A0 of described I-shaped bucking electrode A0 middle upper portion ^*And symmetrical monitor electrode M, M ' and bucking electrode A1, the A1 ' that is located at described I-shaped bucking electrode A0 both sides waist, described monitor electrode M, M ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' link to each other with wire and guarantee equipotential, bucking electrode A1, A1 ' are arranged on monitor electrode M, the M ' outside of I-shaped bucking electrode A0 both sides waist, the button-type measurement electrode A0 in the middle of described I-shaped bucking electrode A0 ^*The bottom is provided with successively measures button electrode B 0, B1 and B2, described measurement button electrode B 0, B1 and B2 and A0 ^*Link to each other to guarantee equipotential with wire, I-shaped bucking electrode A0 below is provided with witness mark electrode N, and I-shaped bucking electrode A0 is arranged with return electrode B outward, the isolation of insulating each other of each different name electrode.

2. microtrabeculae type focused logging device according to claim 1, it is characterized in that: described measurement electronic circuit comprises current feedback circuit, current measurement circuit, tension measuring circuit, and adopt the down-hole power of two kinds of different frequency power supply modes, for avoiding identical with other logger frequencies, select the underground power supply frequency to be respectively 510.5Hz, 1021Hz, when the underground power supply frequency selection purposes is 510.5Hz, be I-shaped bucking electrode A0 and measurement button electrode B 0 simultaneously, B1 and B2 power supply, B is return electrode, this moment I-shaped bucking electrode A0 and measure button electrode B 0, B1 and B2 equipotential connect, and utilize tension measuring circuit to measure between monitor electrode M and the reference electrode N and measurement electrode A0 ^*And the potential difference between the monitor electrode M; Utilize simultaneously current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2; When the underground power supply frequency is 1021Hz, be bucking electrode A1 power supply, B is return electrode, and this moment, I-shaped bucking electrode A0 and is connected button electrode B 0, B1 and the connection of B2 equipotential utilized between tension measuring circuit measurement monitor electrode M and the reference electrode N and measurement electrode A0 ^*And the potential difference between the monitor electrode M utilizes current measurement circuit to detect the current value of measuring on button electrode B 0, B1 and the B2 simultaneously.

3. microtrabeculae type focused logging device according to claim 1 and 2 is characterized in that: the equipotential surface in forward position, microtrabeculae pole plate center is for half-cylindrical.

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