CN102094645A - Small-bore microspherically-focused logging instrument - Google Patents
Small-bore microspherically-focused logging instrument Download PDFInfo
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- CN102094645A CN102094645A CN2011100552997A CN201110055299A CN102094645A CN 102094645 A CN102094645 A CN 102094645A CN 2011100552997 A CN2011100552997 A CN 2011100552997A CN 201110055299 A CN201110055299 A CN 201110055299A CN 102094645 A CN102094645 A CN 102094645A
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Abstract
The invention relates to a small-bore microspherically-focused logging instrument comprising a casing, an electronic circuit board, a microsphere polar plate and a polar plate telescoping ram. Five electrodes on the microsphere polar plate are respectively a main electrode A0, a mud cake correction electrode M0, a shielding electrode A1, a monitoring electrode M1 and a monitoring electrode M2 from inside to outside, the circuit board is provided with a power supply unit, a signal measuring unit, a microprocessor and a potential difference sampling circuit between the monitoring electrodes, and the power supply unit comprises a sine wave generator, a frequency selection filter 1, a summator, a power amplifier 1 and a voltage controlled constant current source; and the signal measuring unit comprises a main current measuring circuit and a potential difference measuring circuit for measuring the potential difference between M0 and M1. The small-bore microspherically-focused logging instrument has the advantages of reasonable design in the circuit part, small external diameter, light weight, good application effect, safety and reliability, and convenience for operation, and can be used for solving the problems of complicated electronic circuit, low logging efficiency, pool application effect, incapability of drilling in a small hole for measurement due to heavy weight and large external diameter and the like in the traditional microspherically-focused logging instrument.
Description
Technical field
The present invention relates to a kind of logging instrument, especially relate to a kind of small-bore microspherically focused tool.
Background technology
The exploration of coal bed gas and exploitation not only can increase new clear energy sources, and significant to Safety of Coal Mine Production and environmental protection.Coalbed gas logging is the main means of cbm exploration and exploitation, application of advanced, reasonable, effectively logging method, can ask for the important parameter of coal seam reservoirs, as the degree of depth, thickness and the structure in coal seam, Industrial Analysis index, air content, permeability etc., can reduce construction and other test events of stratigraphic well, improve to bore and imitate, reduce cost greatly.By the coalbed gas logging code requirement that middle coal bed gas Co., Ltd issues, micro shape focusing resistivity is one of the parameter that must survey.
Micro-SFL (MSFL) is to be used for measuring the drilling well resistivity of stratum flushed zone on every side, and it is while and dual laterolog measurement in a closed series often, can reflect the stratum in the variation of resistivity in the radial direction, estimates the permeability of coal rock layer.At present, the external diameter of domestic petroleum system microspherically focused tool and pole plate all big (general instrument diameter is the wide 135mm of being of 89mm, pole plate), and Heavy Weight, the price height, and coal system is because the power of logging winch is little, cable is thin, thereby draws motionlessly, and instrument directly connects and also has difficulties, and the coalfield bore diameter is generally all at 90mm to 145mm, and existing instrument can't be measured this type of drilling well.Therefore, study very necessity of suitable small-bore microspherically focused tool.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, a kind of small-bore microspherically focused tool is provided, its circuit part is reasonable in design, the instrument external diameter is little, in light weight and it is easy and simple to handle to use, result of use good, safe and reliable, can effectively solve practical problems such as electronic circuit complexity, logging efficiency that existing microspherically focused tool exists are low, weight is big, result of use is relatively poor and can't be in the difficult problem of small-bore drilling measuring.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of small-bore microspherically focused tool, comprise the shaft-like shell of cylinder, electronic circuit board, microballoon pole plate and drive the pole plate telescoping ram that described microballoon pole plate is close to the borehole wall, described electronic circuit board is installed in the shaft-like shell of cylinder, and described microballoon pole plate is installed on the pole plate telescoping ram carriage of the shaft-like outer casing underpart of described cylinder; Described microballoon pole plate is made up of rectangular rubber plate and five electrodes that are embedded on the described rectangular rubber plate, and five electrodes are respectively main electrode A from the inside to the outside
0, mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2, main electrode A
0Be rectangular electrode and mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2Be ring electrode, described main electrode A
0Join with the earthing electrode B of logging instrument, it is characterized in that: be laid with power supply unit, signal measurement unit and microprocessor on the described electronic circuit board and monitor electrode M
1With monitor electrode M
2Between potential difference V
I0Potential difference sample circuit between the monitor electrode of gathering in real time, described microprocessor by data transmission port be laid in ground log data acquisition system and join;
Described power supply unit comprises sine-wave generator, joins and output reference voltage signal V with sine-wave generator
fFrequency-selecting filter one, to reference voltage signal V
fWith potential difference V
I0The adder that superposes, and the power amplifier one that joins of adder and and described monitor electrode between the voltage controlled current source that joins of the output of potential difference sample circuit, two outputs of described power amplifier one respectively with main electrode A
0With bucking electrode A
1It is also corresponding to main electrode A to join
0With bucking electrode A
1Between produce bucking current I
1Potential difference sample circuit, adder and power amplifier one are formed according to potential difference V between described monitor electrode
I0Numerical values recited to bucking current I
1The current value size adjust accordingly, and with potential difference V
I0Be adjusted to zero positive feedback control circuit gradually; Described voltage controlled current source and main electrode A
0Join described voltage controlled current source, main electrode A
0Form main current supply circuit with earthing electrode B, the loop current of described main current supply circuit is principal current I
0And principal current I
0The current value size control adjustment by voltage controlled current source according to the voltage sampling signal of potential difference sample circuit output between described monitor electrode; The potential difference sample circuit joins with two inputs of adder respectively between described frequency-selecting filter one and monitor electrode;
Described signal measurement unit comprises principal current I
0The main current measurement circuit of measuring in real time and to mudcake correction electrode M
0With monitor electrode M
1Between potential difference V
0The potential difference measurement circuit of measuring in real time, described main current measurement circuit and potential difference measurement circuit all join with described microprocessor.
Above-mentioned small-bore microspherically focused tool is characterized in that: the output of described frequency-selecting filter one is through divider resistance R
1The back joins with an input of adder, and the output of potential difference sample circuit is through sampling resistor R between described monitor electrode
2The back joins with another input of adder; The output of described voltage controlled current source is through resistance R
0Back and main electrode A
0Join.
Above-mentioned small-bore microspherically focused tool, it is characterized in that: described main current measurement circuit comprises transformer B2, power amplifier two, frequency-selecting filter two, rectification circuit one and A/D change-over circuit one, two terminals of described transformer B2 primary coil respectively with resistance R
0Two ends join and two terminals of its secondary coil join with two inputs of power amplifier two respectively, the input of the output of described power amplifier two and frequency-selecting filter two joins, the input of the output of frequency-selecting filter two and described rectification circuit one joins, and described rectification circuit joins with described microprocessor once A/D change-over circuit one back.
Above-mentioned small-bore microspherically focused tool, it is characterized in that: described potential difference measurement circuit comprises transformer B3, power amplifier three, frequency-selecting filter three, rectification circuit two and A/D change-over circuit two, two terminals of described transformer B3 primary coil respectively with mudcake correction electrode M
0With monitor electrode M
1Join and two terminals of its secondary coil join with two inputs of power amplifier three respectively, the input of the output of described power amplifier three and frequency-selecting filter three joins, the input of the output of frequency-selecting filter three and described rectification circuit two joins, and described rectification circuit two joins with described microprocessor behind A/D change-over circuit two.
Above-mentioned small-bore microspherically focused tool is characterized in that: also comprise be used to produce synchronous control signal Q and
The control signal generator, described rectification circuit one is a phase-sensitive rectifier circuit one, described rectification circuit two is a phase-sensitive rectifier circuit two, and two control ends of described phase-sensitive rectifier circuit one and phase-sensitive rectifier circuit two all join with two control signal outputs of control signal generator.
Above-mentioned small-bore microspherically focused tool is characterized in that: the potential difference sample circuit comprises transformer B4, power amplifier four, frequency-selecting filter four and resistance R between described monitor electrode
3, two terminals of described transformer B4 primary coil respectively with monitor electrode M
1With monitor electrode M
2Join and two terminals of its secondary coil join with two inputs of power amplifier four respectively, the input of the output of power amplifier four and frequency-selecting filter four joins, the resistance R of described frequency-selecting filter four through being connected in series with it
3Back output.
Above-mentioned small-bore microspherically focused tool is characterized in that: described power amplifier one and main electrode A
0With mudcake correction electrode M
0Between be connected to transformer B1, two outputs of described power amplifier one join with two terminals of transformer B1 primary coil respectively, and two terminals of transformer B1 secondary coil respectively with main electrode A
0With mudcake correction electrode M
0Join; Be connected to transformer B5 between described monitor electrode between the output of potential difference sample circuit and the voltage controlled current source, the output of potential difference sample circuit joins between terminals ground connection of described transformer B5 primary coil and its another terminals and described monitor electrode, two terminals of described transformer B5 secondary coil respectively with main electrode A
0With bucking electrode A
1Join.
Above-mentioned small-bore microspherically focused tool, it is characterized in that: described microprocessor draws the single-chip microcomputer of tested flushed zone resistivity for converting according to the measured signal of main current measurement circuit and potential difference measurement circuit, the output of described main current measurement circuit and potential difference measurement circuit all joins with single-chip microcomputer, and described single-chip microcomputer and data transmission port are joined.
Above-mentioned small-bore microspherically focused tool is characterized in that: the length of the shaft-like shell of described cylinder is that 2.35m ± 0.2m and its external diameter are 45mm～50mm.
Above-mentioned small-bore microspherically focused tool is characterized in that: described sine-wave generator is that output frequency is the sine-wave generator of 1000Hz, and the length of the shaft-like shell of described cylinder is that 2.35m and its external diameter are 50mm.
The present invention compared with prior art has the following advantages:
1, reasonable in design, simple in structure and use easy and simple to handlely, mainly form by electrode pad, pole plate telescoping ram, power supply circuits, measuring circuit, control circuit, single-chip microcomputer, signal transmission port etc.
2, bore is little, function admirable and applied widely, and tool length is 2.35m, external diameter is 50mm, fathoms to be that 2000m, operating temperature are 0～60 ℃.
3, in light weight and safe in utilization, reliable.
4, the electronic circuit partial design is reasonable and logging efficiency is high, when the circuit of existing microspherically focused tool is effectively simplified, makes that also the performance of electronic circuit part is more efficient, has also dwindled the length and the external diameter of inserting tube simultaneously significantly.
5, result of use is good and practical value is high, every performance indications meet the well logging standard-required, and measured log reflection is good, can satisfy the requirement of relevant well logging standard fully, evaluation and exploitation to coal bed gas have great importance, and have also obtained very considerable economic simultaneously.
In sum, circuit part of the present invention is reasonable in design, the instrument external diameter is little, in light weight and it is easy and simple to handle to use, result of use good, safe and reliable, can effectively solve the difficult problem that practical problems such as electronic circuit complexity, logging efficiency that existing microspherically focused tool exists are low, weight is big, result of use is relatively poor and, external diameter big because of instruments weight slightly can't be measured at slimhole drilling.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the ordered state schematic diagram of each electrode on the microballoon pole plate of the present invention.
Fig. 2 is the Electric Field Distribution schematic diagram of each electrode on the microballoon pole plate of the present invention.
Fig. 3 is a schematic block circuit diagram of the present invention.
Fig. 4 is the schematic diagram of the measured comprehensive logging curve of the present invention.
Description of reference numerals:
The 1-electrode; The 2-data transmission port; The 3-1-sine-wave generator;
3-2-frequency-selecting filter one; The 3-3-adder; 3-4-power amplifier one;
The 3-5-voltage controlled current source; 4-1-power amplifier two; 4-2-frequency-selecting filter two;
4-3-phase-sensitive rectifier circuit one; 4-4-A/D change-over circuit one; 5-1-power amplifier three;
5-2-frequency-selecting filter three; 5-3-phase-sensitive rectifier circuit two; 5-4-A/D change-over circuit two;
6-control signal generator; 6-1-power amplifier four; 6-2-frequency-selecting filter four;
The 7-single-chip microcomputer; 8-power amplifier five.
The specific embodiment
As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, the present invention includes the shaft-like shell of cylinder, electronic circuit board, microballoon pole plate and drive the pole plate telescoping ram that described microballoon pole plate is close to the borehole wall, described electronic circuit board is installed in the shaft-like shell of cylinder, and described microballoon pole plate is installed on the pole plate telescoping ram carriage of the shaft-like outer casing underpart of described cylinder.During actual the use,, and make the microballoon pole plate be close to the borehole wall by the pole plate telescoping ram by motor-driven pole plate telescoping ram.Described microballoon pole plate is made up of rectangular rubber plate and five electrodes 1 that are embedded on the described rectangular rubber plate, and five electrodes 1 are respectively main electrode A from the inside to the outside
0, mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2, main electrode A
0Be rectangular electrode and mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2Be ring electrode, described main electrode A
0Join with the earthing electrode B of logging instrument.In the present embodiment, the microballoon pole plate that is adopted focuses on little pole plate for the existing rectangle microballoon that is adopted, and the width of described rectangular rubber plate is that 10cm and its highly are 23cm.The shape of five electrodes 1, size, put in order and spacing all different, be respectively main electrode A from inside to outside
0, mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2Main electrode A
0Rectangular, other electrodes are ring-type rectangles.During actual the use, described microballoon pole plate makes electrode directly contact with the borehole wall by the pole plate telescoping ram, and electric field equipotential surface almost spherical distributes during instrument work, and the solid line of band arrow is the electric current line among Fig. 2, and dotted line is an equipotential surface.Main electrode A
0Confess two parts electric current, a part is principal current I
0, being radial inflow flushed zone and getting back to B electrode (instrumentally), another part is bucking current I
1, in mud cake, flow, get back to bucking electrode A
1, by adjusting screen stream I
1Keep two monitor electrode M
1And M
2Between the current potential approximately equal, make its equipotential surface spherical in shape.Measure mudcake correction electrode M
0With monitor electrode M
1Potential difference V between the electrode
0With principal current I
0, just can calculate the resistivity R of stratum flushed zone
X0: R
X0=K* (V
0/ I
0), (K is an electrode coefficient 0.041 in the formula).
The pole plate telescoping ram is made up of several parts such as motor, connecting rod, pole plate bracket, high pressure springs.Supply 90V DC voltage through logging cable to motor by ground instrument during work, motor rotates drivening rod, makes electrode pad open or draw in.After microballoon pole plate (being electrode pad) is opened, force its parallel borehole wall of being close to by the high pressure spring, the microballoon pole plate just is close to upwards slip of the borehole wall when carrying instrument on the logging winch.In the present embodiment, with tool housing (being the shaft-like shell of described cylinder) as earthing electrode B.
During actual the laying, be laid with power supply unit, signal measurement unit and microprocessor on the described electronic circuit board and to monitor electrode M
1With monitor electrode M
2Between potential difference V
I0Potential difference sample circuit between the monitor electrode of gathering in real time, described microprocessor by data transmission port 2 be laid in ground log data acquisition system and join.
In the present embodiment, described power supply unit comprises sine-wave generator 3-1, joins and output reference voltage signal V with sine-wave generator 3-1
fFrequency-selecting filter one 3-2, to reference voltage signal V
fWith potential difference V
I0The adder 3-3 that superposes, and power amplifier one 3-4 that joins of adder 3-3 and and described monitor electrode between the voltage controlled current source 3-5 that joins of the output of potential difference sample circuit, two outputs of described power amplifier one 3-4 respectively with main electrode A
0With bucking electrode A
1It is also corresponding to main electrode A to join
0With bucking electrode A
1Between produce bucking current I
1Potential difference sample circuit, adder 3-3 and power amplifier one 3-4 form according to potential difference V between described monitor electrode
I0Numerical values recited to bucking current I
1The current value size adjust accordingly, and with potential difference V
I0Be adjusted to zero positive feedback control circuit gradually.Described voltage controlled current source 3-5 and main electrode A
0Join described voltage controlled current source 3-5, main electrode A
0Form main current supply circuit with earthing electrode B, the loop current of described main current supply circuit is principal current I
0And principal current I
0The current value size control adjustment by voltage controlled current source 3-5 according to the voltage sampling signal of potential difference sample circuit output between described monitor electrode.The potential difference sample circuit joins with two inputs of adder 3-3 respectively between described frequency-selecting filter one 3-2 and monitor electrode.The electric current that described voltage controlled current source 3-5 is exported adjusts accordingly with the size of the voltage sampling signal of potential difference sample circuit output between described monitor electrode, and under any voltage sampling signal effect, the current value of described voltage controlled current source 3-5 institute output current is constant.
Described signal measurement unit comprises principal current I
0The main current measurement circuit of measuring in real time and to mudcake correction electrode M
0With monitor electrode M
1Between potential difference V
0The potential difference measurement circuit of measuring in real time, described main current measurement circuit and potential difference measurement circuit all join with described microprocessor.
During physical cabling, the output of described frequency-selecting filter one 3-2 is through divider resistance R
1The back joins with the input of adder 3-3, and the output of potential difference sample circuit is through sampling resistor R between described monitor electrode
2The back joins with another input of adder 3-3.The output of described voltage controlled current source 3-5 is through resistance R
0Back and main electrode A
0Join.
In the present embodiment, described main current measurement circuit comprises transformer B2, power amplifier two 4-1, frequency-selecting filter two 4-2, rectification circuit one and A/D change-over circuit one 4-4, two terminals of described transformer B2 primary coil respectively with resistance R
0Two ends join and two terminals of its secondary coil join with two inputs of power amplifier two 4-1 respectively, the input of the output of described power amplifier two 4-1 and frequency-selecting filter two 4-2 joins, the output of frequency-selecting filter two 4-2 and the input of described rectification circuit one join, and described rectification circuit joins with described microprocessor behind A/D change-over circuit one 4-4.
Described potential difference measurement circuit comprises transformer B3, power amplifier three 5-1, frequency-selecting filter three 5-2, rectification circuit two and A/D change-over circuit two 5-4, two terminals of described transformer B3 primary coil respectively with mudcake correction electrode M
0With monitor electrode M
1Join and two terminals of its secondary coil join with two inputs of power amplifier three 5-1 respectively, the input of the output of described power amplifier three 5-1 and frequency-selecting filter three 5-2 joins, the output of frequency-selecting filter three 5-2 and the input of described rectification circuit two join, and described rectification circuit two joins with described microprocessor behind A/D change-over circuit two 5-4.
Simultaneously, the present invention also comprise be used to produce synchronous control signal Q and
Control signal generator 6, described rectification circuit one is phase-sensitive rectifier circuit one 4-3, described rectification circuit two is phase-sensitive rectifier circuit two 5-3, and two control ends of described phase-sensitive rectifier circuit one 4-3 and phase-sensitive rectifier circuit two 5-3 all join with two control signal outputs of control signal generator 6.
In the present embodiment, the potential difference sample circuit comprises transformer B4, power amplifier four 6-1, frequency-selecting filter four 6-2 and resistance R between described monitor electrode
3, two terminals of described transformer B4 primary coil respectively with monitor electrode M
1With monitor electrode M
2Join and two terminals of its secondary coil join with two inputs of power amplifier four 6-1 respectively, the input of the output of power amplifier four 6-1 and frequency-selecting filter four 6-2 joins, the resistance R of described frequency-selecting filter four 6-2 through being connected in series with it
3Back output.
Described power amplifier one 3-4 and main electrode A
0With mudcake correction electrode M
0Between be connected to transformer B1, two outputs of described power amplifier one 3-4 join with two terminals of transformer B1 primary coil respectively, and two terminals of transformer B1 secondary coil respectively with main electrode A
0With mudcake correction electrode M
0Join.Be connected to transformer B5 between the output of potential difference sample circuit and the voltage controlled current source 3-5 between described monitor electrode, the output of potential difference sample circuit joins between terminals ground connection of described transformer B5 primary coil and its another terminals and described monitor electrode, two terminals of described transformer B5 secondary coil respectively with main electrode A
0With bucking electrode A
1Join.During physical cabling, frequency-selecting filter four 6-2 between described monitor electrode in the potential difference sample circuit are through resistance R
3After respectively with resistance R
2Join with terminals of transformer B5 primary coil.
In the present embodiment, described microprocessor draws the single-chip microcomputer 7 of tested flushed zone resistivity for converting according to the measured signal of main current measurement circuit and potential difference measurement circuit, the output of described main current measurement circuit and potential difference measurement circuit all joins with single-chip microcomputer 7, and described single-chip microcomputer 7 joins with data transmission port 2.
During actual processing and fabricating, the length of the shaft-like shell of described cylinder is that 2.35m ± 0.2m and its external diameter are 45mm～50mm.In the present embodiment, described sine-wave generator 3-1 is that output frequency is the sine-wave generator of 1000Hz, and the length of the shaft-like shell of described cylinder is that 2.35m and its external diameter are 50mm.
In the present embodiment, described sine-wave generator 3-1 joins with control signal generator 6 behind power amplifier 58.Described frequency-selecting filter one 3-2, frequency-selecting filter two 4-2, frequency-selecting filter three 5-2 and frequency-selecting filter four 6-2 are active filter.
In the actual use, the sinusoidal wavelength-division two-way of the 1000Hz of sine-wave generator 3-1 output: the one tunnel produces reference signal V after frequency-selecting filter one 3-2 carries out frequency-selecting
fAnd give adder 3-3, pass through adder 3-3 afterwards with reference signal V
fWith monitor electrode M
1With monitor electrode M
2Between potential difference V
I0(wherein, V
I0Be the Supervised Control signal) stack, reference signal V
fWith potential difference V
I0Between difference after power amplifier one 3-4 amplifies at main electrode A
0With bucking electrode A
1Between produce bucking current I
1Another road after power amplifier 58 amplifies, deliver to control signal generator 6 and corresponding generation synchronous control signal Q and
Meanwhile, monitor electrode M
1And M
2Between the uneven potential difference that produced, successively through power amplifier four 6-1 amplify, frequency-selecting filter four 6-2 compacting disturbs and noise, the output useful signal is potential difference V
10, the useful signal of being exported divides two-way: the one road delivers to and produces principal current I behind the voltage controlled current source 3-5
0Another road is as Supervised Control signal V
10, with reference signal V
fStack is also tackled bucking current I mutually
1The current value size control adjustment.Described signal measurement unit comprises two identical measuring circuits of circuit of main current measurement circuit and potential difference measurement circuit, is used for measuring principal current I respectively
0With mudcake correction electrode M
0With monitor electrode M
1Between potential difference V
0, and two measuring circuits all are to amplify, export direct current signal behind active filter frequency-selecting and the phase-sensitive rectifier through the one-level amplifier, then single-chip microcomputer 7 and synchronous control signal Q and
Control under, to principal current I
0With with potential difference V
0Carry out A/D conversion, after data transmission port 2 is sent to ground instrument is the log data acquisition system.
Before the actual well logging, at first select to meet the boring of measuring condition (specifically be aperture at 110mm to 300mm and contain drilling fluid), use the simulated formation resistor network to carry out scale before the well logging, check whether work of the present invention is normal, just can go into the well after working properly.During actual well logging, the present invention down to the darkest measured place, is opened the microballoon pole plate after the energising, treat that indicator lamp goes out after, just can start and propose the present invention on the logging winch and formally log well.Because the microballoon pole plate is adherent, must note observing cable stretch during well logging and change, prevention is met card or is in time stopped.Described single-chip microcomputer 7 adopts logging data processing software to survey data principal current I
0With potential difference V
0Entangle preliminary treatment such as non-point, the degree of depth are evened up, filtering, again according to formula R
X0=K* (V
0/ I
0) calculate (K is an electrode coefficient 0.041), just can obtain stratum flushed zone resistivity curve.Log data of the present invention and dual laterolog curves overlapped are used, can be estimated the permeability of coal rock layer.The profile amplitude difference is big more, and permeability is good more; Otherwise then permeability is poor more.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (10)
1. small-bore microspherically focused tool, comprise the shaft-like shell of cylinder, electronic circuit board, microballoon pole plate and drive the pole plate telescoping ram that described microballoon pole plate is close to the borehole wall, described electronic circuit board is installed in the shaft-like shell of cylinder, and described microballoon pole plate is installed on the pole plate telescoping ram carriage of the shaft-like outer casing underpart of described cylinder; Described microballoon pole plate is made up of rectangular rubber plate and five electrodes (1) that are embedded on the described rectangular rubber plate, and five electrodes (1) are respectively main electrode A from the inside to the outside
0, mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2, main electrode A
0Be rectangular electrode and mudcake correction electrode M
0, bucking electrode A
1, monitor electrode M
1With monitor electrode M
2Be ring electrode, described main electrode A
0Join with the earthing electrode B of logging instrument, it is characterized in that: be laid with power supply unit, signal measurement unit and microprocessor on the described electronic circuit board and monitor electrode M
1With monitor electrode M
2Between potential difference V
I0Potential difference sample circuit between the monitor electrode of gathering in real time, described microprocessor by data transmission port (2) be laid in ground log data acquisition system and join;
Described power supply unit comprises sine-wave generator (3-1), joins and output reference voltage signal V with sine-wave generator (3-1)
fFrequency-selecting filter one (3-2), to reference voltage signal V
fWith potential difference V
I0The adder that superposes (3-3), and the power amplifier one (3-4) that joins of adder (3-3) and and described monitor electrode between the voltage controlled current source (3-5) that joins of the output of potential difference sample circuit, two outputs of described power amplifier one (3-4) respectively with main electrode A
0With bucking electrode A
1It is also corresponding to main electrode A to join
0With bucking electrode A
1Between produce bucking current I
1Potential difference sample circuit, adder (3-3) and power amplifier one (3-4) are formed according to potential difference V between described monitor electrode
I0Numerical values recited to bucking current I
1The current value size adjust accordingly, and with potential difference V
I0Be adjusted to zero positive feedback control circuit gradually; Described voltage controlled current source (3-5) and main electrode A
0Join described voltage controlled current source (3-5), main electrode A
0Form main current supply circuit with earthing electrode B, the loop current of described main current supply circuit is principal current I
0And principal current I
0The current value size control adjustment by voltage controlled current source (3-5) according to the voltage sampling signal of potential difference sample circuit output between described monitor electrode; The potential difference sample circuit joins with two inputs of adder (3-3) respectively between described frequency-selecting filter one (3-2) and monitor electrode;
Described signal measurement unit comprises principal current I
0The main current measurement circuit of measuring in real time and to mudcake correction electrode M
0With monitor electrode M
1Between potential difference V
0The potential difference measurement circuit of measuring in real time, described main current measurement circuit and potential difference measurement circuit all join with described microprocessor.
2. according to the described small-bore microspherically focused tool of claim 1, it is characterized in that: the output of described frequency-selecting filter one (3-2) is through divider resistance R
1The back joins with an input of adder (3-3), and the output of potential difference sample circuit is through sampling resistor R between described monitor electrode
2The back joins with another input of adder (3-3); The output of described voltage controlled current source (3-5) is through resistance R
0Back and main electrode A
0Join.
3. according to the described small-bore microspherically focused tool of claim 2, it is characterized in that: described main current measurement circuit comprises transformer B2, power amplifier two (4-1), frequency-selecting filter two (4-2), rectification circuit one and A/D change-over circuit one (4-4), two terminals of described transformer B2 primary coil respectively with resistance R
0Two ends join and two terminals of its secondary coil join with two inputs of power amplifier two (4-1) respectively, the input of the output of described power amplifier two (4-1) and frequency-selecting filter two (4-2) joins, the output of frequency-selecting filter two (4-2) and the input of described rectification circuit one join, and described rectification circuit joins with described microprocessor once A/D change-over circuit one (4-4) back.
4. according to the described small-bore microspherically focused tool of claim 3, it is characterized in that: described potential difference measurement circuit comprises transformer B3, power amplifier three (5-1), frequency-selecting filter three (5-2), rectification circuit two and A/D change-over circuit two (5-4), two terminals of described transformer B3 primary coil respectively with mudcake correction electrode M
0With monitor electrode M
1Join and two terminals of its secondary coil join with two inputs of power amplifier three (5-1) respectively, the input of the output of described power amplifier three (5-1) and frequency-selecting filter three (5-2) joins, the output of frequency-selecting filter three (5-2) and the input of described rectification circuit two join, and described rectification circuit two joins with described microprocessor behind A/D change-over circuit two (5-4).
5. according to the described small-bore microspherically focused tool of claim 4, it is characterized in that: also comprise be used to produce synchronous control signal Q and
Control signal generator (6), described rectification circuit one is phase-sensitive rectifier circuit one (4-3), described rectification circuit two is phase-sensitive rectifier circuit two (5-3), and two control ends of described phase-sensitive rectifier circuit one (4-3) and phase-sensitive rectifier circuit two (5-3) all join with two control signal outputs of control signal generator (6).
6. according to the described small-bore microspherically focused tool of arbitrary claim in the claim 1 to 5, it is characterized in that: the potential difference sample circuit comprises transformer B4, power amplifier four (6-1), frequency-selecting filter four (6-2) and resistance R between described monitor electrode
3, two terminals of described transformer B4 primary coil respectively with monitor electrode M
1With monitor electrode M
2Join and two terminals of its secondary coil join with two inputs of power amplifier four (6-1) respectively, the input of the output of power amplifier four (6-1) and frequency-selecting filter four (6-2) joins, the resistance R of described frequency-selecting filter four (6-2) through being connected in series with it
3Back output.
7. according to the described small-bore microspherically focused tool of arbitrary claim in the claim 1 to 5, it is characterized in that: described power amplifier one (3-4) and main electrode A
0With mudcake correction electrode M
0Between be connected to transformer B1, two outputs of described power amplifier one (3-4) join with two terminals of transformer B1 primary coil respectively, and two terminals of transformer B1 secondary coil respectively with main electrode A
0With mudcake correction electrode M
0Join; Be connected to transformer B5 between the output of potential difference sample circuit and the voltage controlled current source (3-5) between described monitor electrode, the output of potential difference sample circuit joins between terminals ground connection of described transformer B5 primary coil and its another terminals and described monitor electrode, two terminals of described transformer B5 secondary coil respectively with main electrode A
0With bucking electrode A
1Join.
8. according to the described small-bore microspherically focused tool of arbitrary claim in the claim 1 to 5, it is characterized in that: described microprocessor draws the single-chip microcomputer (7) of tested flushed zone resistivity for converting according to the measured signal of main current measurement circuit and potential difference measurement circuit, the output of described main current measurement circuit and potential difference measurement circuit all joins with single-chip microcomputer (7), and described single-chip microcomputer (7) joins with data transmission port (2).
9. according to the described small-bore microspherically focused tool of arbitrary claim in the claim 1 to 5, it is characterized in that: the length of the shaft-like shell of described cylinder is that 2.3 5m ± 0.2m and its external diameter are 4 5mm～5 0mm.
10. according to the described small-bore microspherically focused tool of claim 9, it is characterized in that: described sine-wave generator (3-1) is the sine-wave generator of 1000Hz for output frequency, and the length of the shaft-like shell of described cylinder is that 2.35m and its external diameter are 50mm.
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| CN104775804A (en) * | 2014-01-10 | 2015-07-15 | 中国石油集团长城钻探工程有限公司 | Portable well diameter graduator for multi-arm sidewall contact device |
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| CN111474591A (en) * | 2020-04-01 | 2020-07-31 | 中国石油天然气集团有限公司 | Method for testing residual potential difference and main screen flow ratio of homogeneous stratum for azimuth array lateral direction |
| CN111474591B (en) * | 2020-04-01 | 2022-11-04 | 中国石油天然气集团有限公司 | Method for testing residual potential difference and main screen flow ratio of homogeneous stratum for azimuth array lateral direction |
| CN112081585A (en) * | 2020-09-29 | 2020-12-15 | 中国石油天然气集团有限公司 | Autonomous focusing circuit of array lateral logging instrument and control method |
| CN112081585B (en) * | 2020-09-29 | 2024-03-26 | 中国石油天然气集团有限公司 | Autonomous focusing circuit of array lateral logging instrument and control method |
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