CN86105449A - Adjacent spherical focussed log method and instrument - Google Patents
Adjacent spherical focussed log method and instrument Download PDFInfo
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- CN86105449A CN86105449A CN198686105449A CN86105449A CN86105449A CN 86105449 A CN86105449 A CN 86105449A CN 198686105449 A CN198686105449 A CN 198686105449A CN 86105449 A CN86105449 A CN 86105449A CN 86105449 A CN86105449 A CN 86105449A
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Abstract
The invention discloses a kind of well logging apparatus that belongs to the microresistivity current focusing that oil exploration drilling is measured flushed zone resistivity that is used for.
The present invention be considered to desirable same quasi-instrument at present and have simple in structurely, recording interval is wide, the advantage that curve is easy to use.
The present invention provides reliable flushed zone resistivity parameter for oil reservoir logging.
Description
The present invention is used to measure the stratum flushed zone resistivity, belongs to microresistivity current focusing well logging apparatus.
In Process of Oil Well Drilling, be full of mud in the well.For pre-well blowout preventing, general mud balance is bigger, makes mud pressure greater than reservoir pressure.At permeable strata.Oil, gas or water near wellbore are driven away by mud filtrate, form flushed zone, and mud particles is then stayed the borehole wall and formed mud cake.
Flushed zone resistivity is the important parameter in the well logging interpretation.At present, the current focusing logging instrumentation that is used to measure flushed zone resistivity both at home and abroad has: ∧ lateralog, spherical focussed log instrument, microspheric focused logging device, micro laterolog tool and proximity log instrument.They all play a part to measure the stratum flushed zone resistivity in different combination well detecting Instruments.
The adjacent spherical focussed log instrument does not have the M of spherical focussed log instrument
0Electrode increases A
0The length of electrode is eliminated wellbore effect.In the well logging process, kept the ball-type electric field of spherical focussed log instrument when well logging, thereby measure flushed zone resistivity more exactly, and have the characteristics that electrode structure is simple and curvilinear motion relaxes of proximity log instrument, this all is favourable to well logging and use data.
The adjacent spherical focussed log instrument comprises electronic circuit and electrode system two parts.Figure one is the principle of work block scheme of this instrument.Among the figure, A
0Be central electrode, A
1And A
' 1Be guarded electrode, M
1And M
' 1, M
2And M
' 2Be monitor electrode, B is the main current loop electrode.The square frame I is the principal current electric power system, and the square frame II is the bucking current electric power system, and the square frame III is a measuring amplifier.
Instrument when work, at first by the principal current electric power system from A
0Send principal current I
0, I
0From A
0To mobile between the B, and at M
1And M
2, M
' 1And M
' 2Between produce potential difference (PD) △ UM
1M
2, this potential difference (PD) is after the bucking current electric power system is amplified, from A
0Send bucking current I
1, I
1At A
0And A
1Between flow, and reduce principal current I as far as possible
0At M
1And M
2Between the potential difference (PD) △ UM that produces
1M
2, make △ UM
1M
2Level off to zero, thereby force principal current to form the ball-type electric field in the stratum, help measuring flushed zone resistivity, its electrical field shape is shown in figure two.
Through calculating and evidence, more satisfactory electrode system size is as follows: central electrode A
0Length own is 8 centimetres, A
0With A
1Between distance be 14 centimetres.Guarded electrode A
1Length own is 4 centimetres, A
1To M
1Between distance be 20 centimetres.Monitor electrode M
1, M
2Length own is 2 centimetres, M
1With M
2Between distance be 8 centimetres.The length of loop electrode B own is 100 centimetres, B electrode and M
2Between distance be 80 centimetres.290 centimetres of electrode system length overalls, 102 centimetres of external diameters.A
1With A
' 1, M
1With M
' 1, M
2With M
' 2Relative A
0The electrode symmetry is arranged, and the instrument profile is shown in figure three.
The present invention is a blank in the current focusing well logging both at home and abroad at present.It has kept the advantage of spherical focussed log instrument, has overcome spherical focussed log instrument logging data quality when well collapses and can not get guaranteeing the shortcoming violent with curvilinear motion.Simultaneously and since the adjacent spherical focussed log instrument absorbed in design adjacent side to partial design thought, thereby the simple advantage of concrete structure, this just makes the actual effect of adjacent spherical focussed log instrument than at present both domestic and external all good with quasi-instrument.
Another notable feature of the present invention is: the non-linear supply line that the principal current electric power system is made up of an AC constant voltage source and resistance in series forms.The present invention has adopted the nonlinear recording mode, and the fundamental formular of its recording mode is:
L＝ (bR
a)/(a+R
a) （1）
L represents the range value of recording chart upper curve, R in the formula
aThe expression formation apparent resistivity, a, b are constant, and a is selected according to the variation range of common resistivity, and b is selected by record paper width.
We are write as following formula:
V
a＝ (V
ak·R
a)/(R
k+R
a) （2）
From the corresponding relation of (1) formula and (2) formula and referring to the non-linear figure of supply line four, can know and measure A
0And the voltage V between the B
a, in fact represented profile amplitude L.V
AkBe the AC constant voltage source output voltage, it uses width b corresponding with the maximum of recording chart.In fact, work as R
aWhen infinitely great, because R
kBe a constant, relevant with instrument K value, so V
aWith V
AkSubstantially equal, profile amplitude maximum at this moment.R
kWith R
aCorrespondence, R
kGenerally get the central value of common formation apparent resistivity.
The circuit of figure four expressions has as seen from the above analysis satisfied the formula relation of nonlinear recording mode.This record mode can before go a step further again than linear recording mode and the logarithm recording mode being accustomed to adopting with quasi-instrument both at home and abroad at present in the resistivity range of variation that the no limit for width of record on the recording chart of limit for width is arranged.Another key character of this recording mode is in common recording interval, and the curvilinear motion amplitude is big, recording chart service efficiency height, and reading error is little.According to the rule that formula (1) is made, easy to use, reading is rapid.
Non-linear supply line also can adopt the way of constant current source parallel resistance shunting, shown in figure five except the way that adopts constant pressure source resistance in series dividing potential drop.Figure five is the non-linear supply lines that adopt constant current source, as can be seen:
I
k·R
k＝（I-I
k）R
a
I
k＝ (I·R
a)/(R
k+R
a) （3）
As seen, according to (3) formula that figure five circuits draw, identical with (2) formula that draws according to figure four circuits.Among the figure four, measurement be A
0And the voltage between the B, that figure five measures is the R that flows through
kElectric current I
k, these two kinds of methods can realize non-linear power supply.
The present invention also can adopt the method for settling electrode system on a pole plate, and the electrode system shape is shown in figure six.Pole plate can be made with electro-insulating rubber, and electrode is made of metal.Pole plate is installed on the telescoping ram of logging instrumentation, and in the well logging process, telescoping ram is pushed pole plate to the borehole wall, makes electrode be close to the borehole wall and measures, thereby eliminate wellbore effect.Such instrument is answered called after " little adjacent spherical focussed log instrument ".It is considered to optimal at present both at home and abroad and compare with quasi-instrument microspheric focused logging device, have following substantive distinguishing features:
1. adopted non-linear electric power system and nonlinear recording mode, measurement range is wide.This just not only can use at the lower husky mudstone stratum of resistivity, and at the higher charcoal rock of resistance, buried hill formations such as Gang Yan can be got comparatively ideal data too.
2. owing to adopted adjacent side to the way of eliminating mudcake effect, make the pole plate manufacturing process simpler than microspheric focused logging device pole plate, maintenance is convenient.Simultaneously, curvilinear motion comparatively relaxes, and does not need the external weighted mean of being accustomed to adopting with quasi-instrument, has simplified circuit greatly, and has guaranteed the quality of first character money.
3. the non-linear electric power system that adopts of the design, its main element is a resistance, not only circuit is simple, and temperature performance is good.The linear recording mode measurement range of custom use both at home and abroad is little at present.Logarithm recording mode complex circuit and temperature performance are bad.The theoretical formula of the nonlinear recording mode that the design adopts is represented a kind of hyperbolic function, thereby also can be described as the hyperbolic function recording mode.Have only linear recording and logarithm to write down two kinds with the recording method that quasi-instrument adopted both at home and abroad at present.
Claims (4)
1, the present invention does not have the M of spherical focussed log instrument
0Electrode increases A
0The length of electrode is eliminated wellbore effect.
2, the present invention has adopted non-linear record mode, and the fundamental formular of its record mode is
L＝ (bR
a)/(a+R
a) （1）
Write following formula as Va=(V
AkR
a)/(R
k+ R
a) (2)
Realize by figure four circuits from the corresponding relation of (1) formula and (2) formula.
3, non-linear supply line also can adopt the way of constant current source parallel resistance shunting, shown in figure five except the way that adopts constant pressure source resistance in series dividing potential drop.
4, the present invention also can adopt the method for settling electrode system on a pole plate, and the electrode system shape is shown in figure six.In the well logging process, telescoping ram is pushed pole plate to the borehole wall, makes electrode be close to the borehole wall and measures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198686105449A CN86105449A (en) | 1986-09-01 | 1986-09-01 | Adjacent spherical focussed log method and instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198686105449A CN86105449A (en) | 1986-09-01 | 1986-09-01 | Adjacent spherical focussed log method and instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86105449A true CN86105449A (en) | 1988-03-23 |
Family
ID=4802848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198686105449A Pending CN86105449A (en) | 1986-09-01 | 1986-09-01 | Adjacent spherical focussed log method and instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86105449A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352748A (en) * | 2011-10-25 | 2012-02-15 | 西安威盛电子仪器有限公司 | Polar plate of micro-disc type focused logging device |
| CN102828745A (en) * | 2012-08-28 | 2012-12-19 | 中国电子科技集团公司第二十二研究所 | Novel micro-spherical focusing logging instrument |
| CN105408773A (en) * | 2013-07-29 | 2016-03-16 | 兰德马克绘图国际公司 | Displaying data for a preferred well |
-
1986
- 1986-09-01 CN CN198686105449A patent/CN86105449A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352748A (en) * | 2011-10-25 | 2012-02-15 | 西安威盛电子仪器有限公司 | Polar plate of micro-disc type focused logging device |
| CN102352748B (en) * | 2011-10-25 | 2015-02-18 | 西安威盛电子仪器有限公司 | Polar plate of micro-disc type focused logging device |
| CN102828745A (en) * | 2012-08-28 | 2012-12-19 | 中国电子科技集团公司第二十二研究所 | Novel micro-spherical focusing logging instrument |
| CN102828745B (en) * | 2012-08-28 | 2015-05-13 | 中国电子科技集团公司第二十二研究所 | Novel micro-spherical focusing logging instrument |
| CN105408773A (en) * | 2013-07-29 | 2016-03-16 | 兰德马克绘图国际公司 | Displaying data for a preferred well |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |