CN203594449U - Measurement device for formation resistivity - Google Patents
Measurement device for formation resistivity Download PDFInfo
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- CN203594449U CN203594449U CN201320570088.1U CN201320570088U CN203594449U CN 203594449 U CN203594449 U CN 203594449U CN 201320570088 U CN201320570088 U CN 201320570088U CN 203594449 U CN203594449 U CN 203594449U
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- formation resistivity
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Abstract
The utility model relates to the field of data measurement technology and discloses a measurement device for formation resistivity. The device comprises at least two emission electrodes, at least one reference potential electrode, at least four measurement probes, at least two circuit electrodes, at least one circuit sensing element, an amplification module, a single chip microcomputer and a power supply module, wherein the emission electrodes, the reference potential electrodes, the measurement probes and the circuit sensing elements are arranged on a casing of a through casing formation resistivity logging instrument; the circuit electrodes are arranged on the ground; the reference potential electrode, the measurement probes and the circuit sensing elements output signals to the amplification module; the amplification module outputs signals to the single chip microcomputer; and the power supply module supplies power for the emission electrodes, the reference potential electrode, the measurement probes, the circuit electrodes, the circuit sensing elements, the amplification module, and the single chip microcomputer. According to the measurement device for formation resistivity, measurement probes are reused for measuring voltage, measurement of resistivity of a plurality of adjacent formation sections can be finished in one-time measurement, and the measurement efficiency of the instrument can be improved.
Description
Technical field
The utility model relates to DATA REASONING technical field, is mainly applicable to the measurement mechanism of formation resistivity.
Background technology
Formation resistivity is to evaluate the requisite key element of reservoir hydrocarbonaceous amount.Formation resistivity depends primarily on the contained liquid in stratum, and containing the resistivity on the stratum of conduction salt solution, than little many of the resistivity on stratum that is full of hydrocarbon medium, thereby the measurement of resistivity has irreplaceable construction value for location hydro carbons ore bed.The measurement of traditional resistivity is carried out in open hole well, owing to being that atomic little (resistivity on stratum is in 1 ohm/meter between 1000 ohm/meter, and the representative value of the resistivity of metal sleeve is 2 × 10 compared with the resistivity of metal sleeve and formation resistivity
-7ohm/meter), therefore traditional resistivity logging tool cannot be realized the measurement to formation resistivity, is necessary to develop sleeve pipe formation resistivity logging instrument.This instrument passes through to measure small voltage drop on sleeve pipe, thereby reaches the object of Formation Resistivity Measurement.
Crossing sleeve pipe formation resistivity logging instrument is a kind of instrument at sleeve pipe borehole measurement formation apparent resistivity.Its important feature is that investigation depth is large, is applicable to the stratum of different aperture degree and formation water salinity.Domestic cased hole formation resistivity logging demand is large, especially in grand celebration, the Liaohe River, tell and breathe out the oil field of contour moisture development late stage, joint-stock company of PetroChina Company Limited. utilizes the cased hole formation resistivity logger of Si Lunbeixie company to carry out the well logging of up to a hundred mouthfuls of wells.Therefore, this measuring apparatus is monitored for oil-gas Layer, determines in old well that the position of the dead oil band of gas and the distribution of remaining oil saturation are of great significance to extend old well production life of well tool.But the subject matter that this instrument exists is at present exactly the measurement that can only complete the resistivity on one section of stratum, has reduced the measurement efficiency of formation resistivity at every turn.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of measurement mechanism of formation resistivity, and it can be in one-shot measurement, completes the measurement of multiple resistivity that are adjacent to interval, has improved the measurement efficiency of formation resistivity.
For solving the problems of the technologies described above, the utility model provides a kind of measurement mechanism of formation resistivity, be applied in sleeve pipe formation resistivity logging instrument, described measurement mechanism comprises: at least 2 emission electrodes, at least 1 reference potential electrode, at least 4 measuring probes, at least 2 loop electrodes, at least 1 current sensing elements, amplification module, single-chip microcomputer and power module; Described emission electrode, described reference potential electrode, described measuring probe and described current sensing elements are all arranged on the described sleeve pipe of crossing sleeve pipe formation resistivity logging instrument; Described loop electrode setting on the ground; Described emission electrode is for launching high-power signal to the described sleeve pipe of crossing sleeve pipe formation resistivity logging instrument; Described loop electrode provides loop for the electric current sending from described emission electrode; Described in another, loop electrode provides potential reference zero point for described reference potential electrode; Described reference potential electrode gathers the electrical potential difference with respect to ground reference point, and outputs to described amplification module and carry out the amplification of signal; Described measuring probe gathers voltage, and outputs to described amplification module and carry out the amplification of signal; Described current sensing elements gathers electric current, and outputs to described amplification module and carry out the amplification of signal; Signal after described amplification module output is amplified is to described single-chip microcomputer; The apparent resistivity formula of the signal that described single-chip microcomputer utilization receives based on stratum calculates formation resistivity; Described power module is that described emission electrode, described reference potential electrode, described measuring probe, described loop electrode, described current sensing elements, described amplification module, described single-chip microcomputer are powered.
Further, also comprise: frequency modulation module; Signal after described amplification module output is amplified carries out the frequency modulation of signal to described frequency modulation module, the signal after described frequency modulation module output frequency modulation is to described single-chip microcomputer; Described power module is that described frequency modulation module is powered.
Further, also comprise: amplitude modulation module; Signal after described frequency modulation module output frequency modulation carries out the amplitude modulation of signal to described amplitude modulation module, and the signal after described amplitude modulation module output amplitude modulation is to described single-chip microcomputer; Described power module is that described amplitude modulation module is powered.
Further, also comprise: analog-to-digital conversion module; Signal after described amplitude modulation module output amplitude modulation carries out the conversion of signal to described analog-to-digital conversion module, the signal after described analog-to-digital conversion module output conversion is to described single-chip microcomputer; Described power module is that described analog-to-digital conversion module is powered.
Further, also comprise: communication module; The formation resistivity calculating is outputed to described communication module by described single-chip microcomputer; Described power module is that described communication module is powered.
Further, also comprise: memory module; Described single-chip microcomputer outputs to described memory module by the formation resistivity calculating and carries out information storage; Described power module is that described memory module is powered.
The beneficial effects of the utility model are:
The measurement mechanism of the formation resistivity that the utility model provides, in use, first utilize reference potential electrode and measuring probe measuring voltage, utilize current sensing elements to measure electric current, the voltage recording by multiplexing measuring probe is again (if any measuring probe C, D, E and F, can by the apparent resistivity formula on stratum obtain respectively cannula C to E section the resistivity on corresponding stratum and sleeve pipe D to F section the resistivity on corresponding stratum, the voltage that the measuring probe E that is multiplexing records), realize in one-shot measurement, complete the measurement of multiple resistivity that are adjacent to interval simultaneously, thereby do not increasing on the basis of measuring apparatus length and complexity, improve the measurement efficiency of instrument, and then improve the service efficiency of instrument.
Accompanying drawing explanation
The structured flowchart of the measurement mechanism of the formation resistivity that Fig. 1 provides for the utility model embodiment;
The distribution map of measuring probe in the measurement mechanism of the formation resistivity that Fig. 2 provides for the utility model embodiment;
The schematic diagram that the measurement mechanism of the formation resistivity that Fig. 3 provides for the utility model embodiment carries out formation resistivity measurement under reference potential measurement pattern;
The schematic diagram that the measurement mechanism of the formation resistivity that Fig. 4 provides for the utility model embodiment carries out formation resistivity measurement under sleeve pipe resistance measurement pattern;
The schematic diagram that the measurement mechanism of the formation resistivity that Fig. 5 provides for the utility model embodiment carries out formation resistivity measurement under Leakage Current measurement pattern.
The specific embodiment
For further setting forth technological means and effect that the utility model is taked for reaching predetermined utility model object, below in conjunction with accompanying drawing and preferred embodiment, the specific embodiment and the operating principle of the measurement mechanism according to the formation resistivity the utility model proposes are elaborated.
The measurement mechanism of the formation resistivity that the utility model embodiment provides is the formula of the apparent resistivity based on stratum
carry out computation and measurement, wherein, k is calibration factor, and V is reference potential value, and Δ Z is the length of measuring stratum, and Δ I is the electric current of revealing in stratum measuring.
Referring to Fig. 1, the measurement mechanism of the formation resistivity that the utility model embodiment provides, comprising: at least 2 emission electrodes, at least 1 reference potential electrode, at least 4 measuring probes, at least 2 loop electrodes, at least 1 current sensing elements, amplification module, frequency modulation module, amplitude modulation module, analog-to-digital conversion module, single-chip microcomputer, memory module, communication module and power module; Emission electrode, reference potential electrode, measuring probe and current sensing elements were all arranged on the sleeve pipe of sleeve pipe formation resistivity logging instrument; Loop electrode setting on the ground; Reference potential electrode gathers with respect to the electrical potential difference of ground reference point, and outputs to amplification module and carry out the amplification of signal; Measuring probe gathers voltage, and outputs to amplification module and carry out the amplification of signal; Current sensing elements gathers electric current, and outputs to amplification module and carry out the amplification of signal; Signal after amplification module output is amplified carries out the frequency modulation of signal to frequency modulation module, signal after frequency modulation module output frequency modulation carries out the amplitude modulation of signal to amplitude modulation module, signal after amplitude modulation module output amplitude modulation carries out the conversion of signal to analog-to-digital conversion module, the signal after analog-to-digital conversion module output conversion is to single-chip microcomputer; The apparent resistivity formula of the signal that single-chip microcomputer utilization receives based on stratum calculates formation resistivity; The formation resistivity calculating is outputed to communication module by single-chip microcomputer; Communication module output signal is to active station.Single-chip microcomputer also outputs to memory module by the formation resistivity calculating and carries out information storage.Power module is that emission electrode, reference potential electrode, measuring probe, loop electrode, current sensing elements, amplification module, frequency modulation module, amplitude modulation module, analog-to-digital conversion module, single-chip microcomputer, memory module and communication module are powered.
Preferably, to contact well with sleeve pipe in order guaranteeing to pop one's head in, and to make probe apply enough large pressure to pierce through wax deposition corrosion layer to casing wall, and had probe for subsequent use to use in the time that a probe loses efficacy, to guarantee normally carrying out of formation resistivity measurement operation.Referring to Fig. 2, in the present embodiment, the number of loop electrode is 2, i.e. loop electrode B and loop electrode G; The number of emission electrode is 2, is respectively emission electrode A and emission electrode Z; The number of reference potential electrode is 2, is respectively reference potential electrode J and reference potential electrode J ', and reference potential electrode is arranged in pairs on sleeve pipe, and reference potential electrode J and reference potential electrode J ' are arranged in pairs on sleeve pipe; The number of measuring probe is 8, be respectively measuring probe C, measuring probe C ', measuring probe D, measuring probe D ', measuring probe E, measuring probe E ', measuring probe F and measuring probe F ', and measuring probe is all arranged in pairs on sleeve pipe, measuring probe C and measuring probe C ' are arranged in pairs on sleeve pipe; Measuring probe D and measuring probe D ' are arranged in pairs on sleeve pipe; Measuring probe E and measuring probe E ' are arranged in pairs on sleeve pipe; Measuring probe F and measuring probe F ' are arranged in pairs on sleeve pipe.Wherein, measuring probe is equidistantly arranged on sleeve pipe, and measuring probe C, measuring probe D, measuring probe E and measuring probe F are equidistantly arranged on sleeve pipe from top to bottom, and the spacing of adjacent measuring probe is L1; Measuring probe C ', measuring probe D ', measuring probe E ' and measuring probe F ' are equidistantly arranged on sleeve pipe from top to bottom, and the spacing of adjacent measuring probe is L1.Further, in order to improve the signal strength signal intensity of reference potential electrode, to increase the validity of potential measurement of the present utility model, reference potential electrode is arranged on the top of measuring probe, be the top that reference potential electrode J is arranged on measuring probe C, the spacing of reference potential electrode J and measuring probe C is L2; Reference potential electrode J ' is arranged on the top of measuring probe C ', and reference potential electrode J ' is L2 with the spacing of measuring probe C '.Loop electrode A is arranged on the top of reference potential electrode J, and loop electrode Z is arranged on the below of measuring probe F.
Embodiment
The measurement mechanism of the formation resistivity providing by the utility model embodiment is measured the resistivity on stratum, and reference potential electrode J-J ' is first set, and is used for the electrical potential difference of the relative ground of measuring apparatus reference point; Measuring probe C-C ' is set, D-D ', E-E ', F-F '; Emission electrode A and emission electrode Z are set, are used for to union body transmitting high-power signal; Loop electrode B and loop electrode G are set, and loop electrode B provides loop for the high-power electric current sending from A to Z, and loop electrode G provides potential reference zero point for reference potential electrode J.
The measurement of formation resistivity need to be carried out under three kinds of patterns, is respectively: reference potential measurement pattern, sleeve pipe resistance measurement pattern and Leakage Current measurement pattern.Concrete steps comprise:
1. referring to Fig. 3, under reference potential measurement pattern (impedance measurement pattern), by electric current I
oinject emission electrode A, return to the current potential V of witness mark potential electrode J from the loop electrode B on ground
o; Be specially: reference potential electrode J carries out signal amplification by the voltage transmission measuring to amplification module, amplification module will be transferred to frequency modulation module through amplifying signal and carry out frequency modulation, frequency modulation module is carried out amplitude modulation by being transferred to amplitude modulation module through the signal of frequency modulation, amplitude modulation module is carried out analog-to-digital conversion by being transferred to analog-to-digital conversion module through the signal of amplitude modulation, analog-to-digital conversion module outputs to single-chip microcomputer by data signal and carries out computing, obtains current potential V
o.Memory module is to the current potential V calculating
opreserve.And by communication module by current potential V
osend to active station.At this moment the all-in resistance on measure portion sleeve pipe and stratum is:
2. referring to Fig. 4, under sleeve pipe resistance measurement pattern (scale measurement pattern), the cover tube resistor between measuring probe C and probe D, probe D and probe E, probe E and probe F.Under this measurement pattern, by electric current I
ninject emission electrode A, electric current I
nfrom emission electrode, Z returns.Measure the voltage V between C and D
1', the voltage V between D and E
2', the voltage V between E and F
3', be specially: measuring probe C, measuring probe D, measuring probe E and measuring probe F carry out signal amplification by the voltage transmission measuring to amplification module respectively separately, amplification module will be transferred to frequency modulation module through amplifying signal and carry out frequency modulation, frequency modulation module is carried out amplitude modulation by being transferred to amplitude modulation module through the signal of frequency modulation, amplitude modulation module is carried out analog-to-digital conversion by being transferred to analog-to-digital conversion module through the signal of amplitude modulation, analog-to-digital conversion module outputs to single-chip microcomputer by data signal and carries out computing, obtains respectively the voltage V between measuring probe C and measuring probe D
1', the voltage V between measuring probe D and measuring probe E
2' and measuring probe E and measuring probe F between voltage V
3'.Memory module is to the voltage V calculating
1', voltage V
2' and voltage V
3' preserve.And by communication module by voltage V
1', voltage V
2' and voltage V
3' send to active station.The resistance that calculates interpolar sleeve pipe is respectively:
Wherein, R
1for the resistance between measuring probe C and measuring probe D, R
2for the resistance between measuring probe D and measuring probe E, R
3for the resistance between measuring probe E and measuring probe F.
3. referring to Fig. 5, under leakage of current measurement pattern, by electric current I
minject electric current I from emission electrode A
mreturn from the loop electrode B on ground.By measuring the voltage V between C and D
1, the voltage V between D and E
2and voltage V between E and F
3estimate to be leaked in C is to E and D to F interval the electric current on stratum.Electric current on calculating sleeve pipe between C and D is V
1/ R
1, the electric current between D and E is V
2/ R
2, the electric current between E and F is V
3/ R
3.Be specially: measuring probe C, measuring probe D, measuring probe E and measuring probe F carry out signal amplification by the voltage transmission measuring to amplification module respectively separately, amplification module will be transferred to frequency modulation module through amplifying signal and carry out frequency modulation, frequency modulation module is carried out amplitude modulation by being transferred to amplitude modulation module through the signal of frequency modulation, amplitude modulation module is carried out analog-to-digital conversion by being transferred to analog-to-digital conversion module through the signal of amplitude modulation, analog-to-digital conversion module outputs to single-chip microcomputer by data signal and carries out computing, obtains respectively the voltage V between measuring probe C and measuring probe D
1, the voltage V between measuring probe D and measuring probe E
2and voltage V between measuring probe E and measuring probe F
3.Memory module is to the voltage V calculating
1, voltage V
2with voltage V
3preserve.And by communication module by voltage V
1, voltage V
2with voltage V
3send to active station.And V
1/ R
1for the electric current between measuring probe C and measuring probe D, V
2/ R
2for the electric current between measuring probe D and measuring probe E, V
3/ R
3for the electric current between measuring probe E and measuring probe F.The difference of electric current is just respectively the electric current that is leaked to stratum in different intervals between two, is:
Wherein,
for be leaked to the electric current on stratum to measuring probe E interval by measuring probe C,
for be leaked to the electric current on stratum to measuring probe F interval by measuring probe D.
According to Ohm's law, under leakage of current measurement pattern, the electromotive force producing on sleeve pipe and stratum is QI
m, reference potential is now QI
m.(5.7)
4. by the apparent resistivity formula on formula (5.2), (5.3), (5.4), (5.5), (5.6) and (5.7) substitution stratum
can obtain respectively
Cannula C to E section the resistivity on corresponding stratum
wherein, K=k Δ z, k is calibration factor, Δ z is the half of C and E distance.
Sleeve pipe D to F section the resistivity on corresponding stratum
wherein, K=k Δ z, k is calibration factor, Δ z is the half of D and F distance.
Here it is to be noted, the utility model can base area layer resistivity practical measurement requirement, increase voluntarily the quantity of measuring probe on sleeve pipe, thereby realize in one-shot measurement, complete the measurement of multiple resistivity that are adjacent to interval simultaneously, and be not only confined to the use of 4 measuring probes set in the present embodiment.
The measurement mechanism of the formation resistivity that the utility model embodiment provides, first utilize reference potential electrode and measuring probe measuring voltage, utilize current sensing elements to measure electric current, the voltage recording by multiplexing measuring probe again, realize in one-shot measurement, completed the measurement of multiple resistivity that are adjacent to interval simultaneously, thereby do not increased on the basis of measuring apparatus length and complexity, improve the measurement efficiency of instrument, and then improved the service efficiency of instrument.The utility model, by electrode is set in pairs, on the one hand, can guarantee that probe applies enough large pressure to pierce through wax deposition corrosion layer to casing wall, realizes the measurement of voltage; On the other hand, in the time that losing efficacy, a probe had probe for subsequent use to use, to guarantee normally carrying out of formation resistivity measurement operation.The utility model is rational in infrastructure, effect is remarkable, practical.
It should be noted last that, the above specific embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (6)
1. the measurement mechanism of a formation resistivity, be applied in sleeve pipe formation resistivity logging instrument, it is characterized in that, described measurement mechanism comprises: at least 2 emission electrodes, at least 1 reference potential electrode, at least 4 measuring probes, at least 2 loop electrodes, at least 1 current sensing elements, amplification module, single-chip microcomputer and power module; Described emission electrode, described reference potential electrode, described measuring probe and described current sensing elements are all arranged on the described sleeve pipe of crossing sleeve pipe formation resistivity logging instrument; Described loop electrode setting on the ground; Described emission electrode is for launching high-power signal to the described sleeve pipe of crossing sleeve pipe formation resistivity logging instrument; Described loop electrode provides loop for the electric current sending from described emission electrode; Described loop electrode provides potential reference zero point for described reference potential electrode; Described reference potential electrode gathers the electrical potential difference with respect to ground reference point, and outputs to described amplification module and carry out the amplification of signal; Described measuring probe gathers voltage, and outputs to described amplification module and carry out the amplification of signal; Described current sensing elements gathers electric current, and outputs to described amplification module and carry out the amplification of signal; Signal after described amplification module output is amplified is to described single-chip microcomputer; The apparent resistivity formula of the signal that described single-chip microcomputer utilization receives based on stratum calculates formation resistivity; Described power module is that described emission electrode, described reference potential electrode, described measuring probe, described loop electrode, described current sensing elements, described amplification module, described single-chip microcomputer are powered.
2. the measurement mechanism of formation resistivity as claimed in claim 1, is characterized in that, also comprises: frequency modulation module; Signal after described amplification module output is amplified carries out the frequency modulation of signal to described frequency modulation module, the signal after described frequency modulation module output frequency modulation is to described single-chip microcomputer; Described power module is that described frequency modulation module is powered.
3. the measurement mechanism of formation resistivity as claimed in claim 2, is characterized in that, also comprises: amplitude modulation module; Signal after described frequency modulation module output frequency modulation carries out the amplitude modulation of signal to described amplitude modulation module, and the signal after described amplitude modulation module output amplitude modulation is to described single-chip microcomputer; Described power module is that described amplitude modulation module is powered.
4. the measurement mechanism of formation resistivity as claimed in claim 3, is characterized in that, also comprises: analog-to-digital conversion module; Signal after described amplitude modulation module output amplitude modulation carries out the conversion of signal to described analog-to-digital conversion module, the signal after described analog-to-digital conversion module output conversion is to described single-chip microcomputer; Described power module is that described analog-to-digital conversion module is powered.
5. the measurement mechanism of the formation resistivity as described in any one in claim 1-4, is characterized in that, also comprises: communication module; The formation resistivity calculating is outputed to described communication module by described single-chip microcomputer; Described power module is that described communication module is powered.
6. the measurement mechanism of formation resistivity as claimed in claim 5, is characterized in that, also comprises: memory module; Described single-chip microcomputer outputs to described memory module by the formation resistivity calculating and carries out information storage; Described power module is that described memory module is powered.
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|---|---|---|---|
| CN201320570088.1U CN203594449U (en) | 2013-09-13 | 2013-09-13 | Measurement device for formation resistivity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213774A (en) * | 2014-08-20 | 2014-12-17 | 中国石油化工集团公司 | Natural electric current logging instrument |
| CN109563738A (en) * | 2016-09-15 | 2019-04-02 | 李善军 | The system and method for casing resistivity instrument |
| CN112946025A (en) * | 2021-01-11 | 2021-06-11 | 中国石油天然气股份有限公司 | Resistance-capacitance oscillation-based underground casing inner coating detector and detection method thereof |
-
2013
- 2013-09-13 CN CN201320570088.1U patent/CN203594449U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213774A (en) * | 2014-08-20 | 2014-12-17 | 中国石油化工集团公司 | Natural electric current logging instrument |
| CN109563738A (en) * | 2016-09-15 | 2019-04-02 | 李善军 | The system and method for casing resistivity instrument |
| CN112946025A (en) * | 2021-01-11 | 2021-06-11 | 中国石油天然气股份有限公司 | Resistance-capacitance oscillation-based underground casing inner coating detector and detection method thereof |
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