CN202165075U - Near-well zone natural potential logging device - Google Patents
Near-well zone natural potential logging device Download PDFInfo
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- CN202165075U CN202165075U CN2011201821981U CN201120182198U CN202165075U CN 202165075 U CN202165075 U CN 202165075U CN 2011201821981 U CN2011201821981 U CN 2011201821981U CN 201120182198 U CN201120182198 U CN 201120182198U CN 202165075 U CN202165075 U CN 202165075U
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- borehole wall
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- rubber
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Abstract
The utility model provides a near-well zone natural potential logging device which belongs to the technical field of petroleum logging. The near-well zone natural potential logging device comprises the following components: a propelling circuit (1), a propelling arm (2), a rubber pole plate (3) and a measuring circuit (4). The propelling circuit (1) is used for controlling opening and closing of the propelling arm (2) and detecting opening dimension of the propelling arm (2). The propelling arm (2) is provided with the rubber pole plate (3) and controls a measurement distance between the rubber pole plate (3) and well wall. The rubber pole plate (3) is provided with an electrode (5). A signal output end of the electrode (5) is connected with a signal input end of the measuring circuit (4). According to the near-well zone natural potential logging device, the rubber pole plate is propelled to a part which is near to the well wall through a propelling device, higher logging curve resolution can be obtained. Actual vertical resolution can reach up to 0.2m, thereby realizing division to thin layer and thin interbed and interlayer fine dividing. Measurement result can truly reflect natural potential information of the stratum and has higher anastomosis degree with lithology profile.
Description
Technical field
The utility model relates to a kind of nearly borehole wall nutural potential logging device, belongs to the petroleum well logging technology field.
Background technology
Nutural potential logging is to be used for one of logging method of formation evaluation the earliest, is still so far and divides lithology, estimates the reservoir, confirms the important means of formation water salinity, be the completion well logging must survey project.In Process of Oil Well Drilling, the mud that uses is water-base mud, because formation water resistivity is different with drilling mud resistivity, causes the suction-operated to ion of ions diffusion effect and rock particles, produces the diffusion adsorption potential.Natural potential comprises diffusion adsorption potential, electrofiltration potential and oxidation-reduction potential, but mainly is made up of the diffusion adsorption potential.Experiment shows that the diffusion adsorption potential of pure shale is 59mv, and the diffusion adsorption potential on clean sandstone stratum is-11.6mv.Therefore according to spontaneous potential curve, can judge lithology and calculating formation water salinity.Conventional nutural potential logging method adopts ground reference electrode N, adopts the continuous measurement electrode M that moves in recorder record down-hole with respect to the potential change (as shown in Figure 1) between the ground reference electrode N, obtains spontaneous potential curve.This method is with ground electrodes electrode as a reference, through the potential difference of this electrode relatively of Different Strata under the measuring well, obtains spontaneous potential curve.The Electric Field Distribution of natural potential shows, under the same formation condition, and the absolute value of vertical electric potential gradient of natural potential and wellbore radius relation in direct ratio, the closer to the borehole wall, vertically electric potential gradient is also big more.
Common self-potential survey method measurement electrode adopts lead electrode placed in the middle, and the natural potential resolution ratio of therefore measuring is lower, and it is bigger to receive the influence of facing layer country rock.The natural potential instrument of the present invention's design adopts nearly borehole wall metering system, and the curve resolution rate obviously is better than the general measure method.
Summary of the invention
The purpose of the utility model is to adopt nearly borehole wall metering system and have spontaneous potential curve vertical resolution preferably and the nearly borehole wall nutural potential logging device of higher Measurement Resolution in order to provide a kind of; Its technical scheme comprises: backup circuit (1), backup arm (2), rubber pad (3) and measuring circuit (4); Backup circuit (1) is used to control the detection of opening size with closure and backup arm (2) of opening of backup arm (2); Backup arm (2) is provided with rubber pad (3) and controls rubber pad (3) and the measuring distance of the borehole wall; Rubber pad (3) is provided with electrode (5), and the signal output part of electrode (5) is connected with the signal input part of measuring circuit (4).
The utlity model has following beneficial effect: through telescoping ram with the rubber pad backup to the nearer distance of the borehole wall; Can obtain higher log resolution ratio; Actual longitudinal frame can reach 0.2 meter, thereby realizes dividing segmentation in thin layer, thin interbed and the layer; And measurement result can be reacted the natural potential information on stratum truly, and is higher with the lithological profile goodness of fit.
Description of drawings
Fig. 1 is a prior art with the ground electrodes potential measurement method sketch map of electrode as a reference;
Fig. 2 is the structural representation of the nearly borehole wall nutural potential logging device that provides of the specific embodiment of the utility model;
Fig. 3 is the structural representation of the rubber pad that provides of the specific embodiment of the utility model;
Fig. 4 is that the A of the rubber pad that provides of the specific embodiment of the utility model is to view;
Fig. 5 is the circuit structure block diagram of the measuring circuit that provides of the specific embodiment of the utility model.
The specific embodiment
The specific embodiment of the utility model provides a kind of nearly borehole wall nutural potential logging device; As shown in Figure 2; Form by backup circuit 1, backup arm 2, rubber pad 3 and measuring circuit 4; Backup circuit 1 is used to control the detection of opening size with closure and backup arm 2 of opening of backup arm 2; Backup arm 2 is provided with rubber pad 3 and controls the measuring distance of the rubber pad 3 and the borehole wall, and rubber pad 3 is provided with electrode 5, and the signal output part of electrode 5 is connected with the signal input part of measuring circuit 4.
The nearly borehole wall nutural potential logging device that this specific embodiment provides adopts and is arranged on the rubber pad 3 lateral electrode 5 as survey tool; To realize the measurement of nearly borehole wall natural potential; Improved the resolution ratio of curve, conventional nutural potential logging method resolution ratio is low to solve, signal amplitude receives the big problem of shoulder effect.Corresponding nearly borehole wall nutural potential logging device is made up of four parts: backup circuit 1, backup arm 2, rubber pad 3 and measuring circuit 4.
Concrete, backup circuit 1 is used to control the detection of opening size with closure and backup arm 2 of opening of backup arm 2, makes the backup arm 2 can be according to the measurement requirement opening and closing, can be by measurement requirement near the borehole wall to guarantee electrode 5.Backup arm 2 is support arms of rubber pad 3, opening and closing under the control of backup circuit 1, drive rubber pad 3 near with leave the borehole wall, to satisfy nearly borehole wall measuring condition.The structure of rubber pad 3 such as Fig. 3 and shown in Figure 4; Form by electrode 5, metab 6, U type rubber tile 7 and two rubber strips 8; Metab 6 is arranged on the backup arm 2, and U type rubber tile 7 is arranged on the metab 6, and electrode 5 is arranged in the groove of U type rubber tile; The signal output part of electrode 5 is connected with the signal input part of measuring circuit 4; The distance that on the protruding both ends of the surface of U type rubber pad 7, is respectively arranged with 8, two rubber strips of a rubber strip 8 and the bottom portion of groove of U type rubber tile 7 is greater than the distance of electrode 5 with the bottom portion of groove of U type rubber tile 7, and the width of two rubber strips 8 is 1.5～2.5 centimetres.Rubber strip 8 is close to the borehole wall in measuring process, and the rubber strip 8 friction boreholes wall, and guard electrode 5 does not rub on the borehole wall.Electrode 5 is fixedly installed on the U type rubber tile 7 through screw 9.
The operating principle of this specific embodiment is: after nearly borehole wall nutural potential logging device is transferred to the pit shaft that is full of water-base mud through the well logging armored cable; After well logging apparatus arrives the measurement target zone; Backup circuit 1 control backup arm 2 opens, and rubber pad 3 clings on the borehole wall, begins to measure; Electrode 5 on the measuring circuit 4 measurement rubber pads 3 and the current potential between the ground electrodes; Note the natural potential numerical value of this depth point through cable transmission to ground installation through analog-to-digital conversion,, obtained a spontaneous potential curve with change in depth along with the lifting of cable; After measurement was accomplished, backup circuit 1 control backup arm 2 drew in, drives rubber pad 3 and leaves the borehole wall, and well logging work is accomplished behind the recovery well logging apparatus in the both sides of closed well logging apparatus.
Further; The composition of measuring circuit 4 is as shown in Figure 5; Preamplifier again after filter circuit filtering, switches to amplifying circuit by analog switch with electric potential signal and amplifies through being sent to single-chip microcomputer after the analog-digital converter conversion again after in the future the electric potential signal of self-electrode 5 amplifies, and single-chip microcomputer is sent to ground installation with data signal through 485 bus apparatus; Single-chip microcomputer can also store data signal in the downhole calibration equipment into simultaneously, is calibrated by the electric potential signal that a reference source equipment is gathered electrode 5.Corresponding preamplifier can adopt the ICL7650 chip, and filter circuit can adopt the OP37 chip, and analog switch can adopt the AD7501 chip; Amplifying circuit can adopt the OP37 chip; Analog-digital converter can adopt the AD1674 chip, and single-chip microcomputer can adopt the 85C91 chip, and downhole calibration equipment can adopt KS-1-6V; A reference source equipment can adopt DZ1, and 485 bus apparatus can adopt MAX485.
The technical scheme that adopts this specific embodiment to provide; Through telescoping ram with the rubber pad backup to the nearer distance of the borehole wall; Can obtain higher log resolution ratio, actual longitudinal frame can reach 0.2 meter, thereby realizes dividing segmentation in thin layer, thin interbed and the layer; And measurement result can be reacted the natural potential information on stratum truly, and is higher with the lithological profile goodness of fit.
The above; Be merely the preferable specific embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion with the protection domain of claims.
Claims (6)
1. nearly borehole wall nutural potential logging device; Comprise backup circuit (1), backup arm (2), rubber pad (3) and measuring circuit (4); It is characterized in that; Backup circuit (1) is used to control the detection of opening size with closure and backup arm (2) of opening of backup arm (2); Backup arm (2) is provided with rubber pad (3) and controls rubber pad (3) and the measuring distance of the borehole wall, and rubber pad (3) is provided with electrode (5), and the signal output part of electrode (5) is connected with the signal input part of measuring circuit (4).
2. nearly borehole wall nutural potential logging device according to claim 1; It is characterized in that; Said rubber pad (3) also comprises metab (6), U type rubber tile (7) and two rubber strips (8), and metab (6) is fixedly connected with backup arm (2), and U type rubber tile (7) is arranged on the metab (6); Two rubber strips (8) are separately positioned on the protruding both ends of the surface of U type rubber tile (7), and electrode (5) is arranged in the groove of U type rubber tile (7).
3. according to the nearly borehole wall nutural potential logging device shown in the claim 2, it is characterized in that the distance of the bottom portion of groove of said two rubber strips (8) and U type rubber tile (7) is greater than the distance of electrode (5) with the bottom portion of groove of U type rubber tile (7).
4. nearly borehole wall nutural potential logging device according to claim 2 is characterized in that the width of said two rubber strips (8) is 1.5～2.5 centimetres.
5. nearly borehole wall nutural potential logging device according to claim 2 is characterized in that said electrode (5) is fixedly installed on the U type rubber tile (7) through screw (9).
6. nearly borehole wall nutural potential logging device according to claim 1; It is characterized in that said measuring circuit (4) comprises preamplifier, filter circuit, analog switch, amplifying circuit, analog-digital converter, single-chip microcomputer, downhole calibration equipment, a reference source equipment and 485 bus apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201821981U CN202165075U (en) | 2011-06-01 | 2011-06-01 | Near-well zone natural potential logging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201821981U CN202165075U (en) | 2011-06-01 | 2011-06-01 | Near-well zone natural potential logging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202165075U true CN202165075U (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201821981U Expired - Fee Related CN202165075U (en) | 2011-06-01 | 2011-06-01 | Near-well zone natural potential logging device |
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| Country | Link |
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| CN (1) | CN202165075U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691498A (en) * | 2012-06-29 | 2012-09-26 | 西南石油大学 | Instrument for measuring electrical parameters of mud-while-drilling in horizontal well |
| CN104213774A (en) * | 2014-08-20 | 2014-12-17 | 中国石油化工集团公司 | Natural electric current logging instrument |
-
2011
- 2011-06-01 CN CN2011201821981U patent/CN202165075U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691498A (en) * | 2012-06-29 | 2012-09-26 | 西南石油大学 | Instrument for measuring electrical parameters of mud-while-drilling in horizontal well |
| CN102691498B (en) * | 2012-06-29 | 2014-11-26 | 西南石油大学 | Instrument for measuring electrical parameters of mud-while-drilling in horizontal well |
| CN104213774A (en) * | 2014-08-20 | 2014-12-17 | 中国石油化工集团公司 | Natural electric current logging instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20200601 |