CN204591256U - A kind of logging instrument and well logging end nose thereof - Google Patents
A kind of logging instrument and well logging end nose thereof Download PDFInfo
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- CN204591256U CN204591256U CN201520311752.XU CN201520311752U CN204591256U CN 204591256 U CN204591256 U CN 204591256U CN 201520311752 U CN201520311752 U CN 201520311752U CN 204591256 U CN204591256 U CN 204591256U
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Abstract
The utility model discloses nose at the bottom of a kind of logging instrument and well logging thereof, integrate the function of natural potential well logging instrument, mud log instrument and well logging end nose, improve device integration, simplify the structure of logging instrument, shorten the entire length of logging instrument.Nose at the bottom of described well logging comprises the top sub of the upper member for connecting logging instrument and is connected to the damping portion of its underpart, described damping portion convergent from top to bottom, described damping portion comprises the emission electrode of mutually insulated, Integrated electrode, the first measurement electrode and the second measurement electrode, and described Integrated electrode is the integrated of natural potential electrode and collecting electrode; Described collecting electrode and described emission electrode are formed measures electric field, and described first measurement electrode and described second measurement electrode are in described measurement electric field, to obtain mud resistivity according to both resistance; Described natural potential electrode is connected with ground electrodes, to detect natural potential.
Description
Technical field
The utility model relates to logging equipment technical field, particularly relates to nose at the bottom of a kind of logging instrument and well logging thereof.
Background technology
Logging equipment has been the instrument of logging operation, is divided into ground instrument and downhole instrument.Well logging is the characteristic in order to find out bed boundary in drilling well, divides a kind of engineer operation of geological section, usually has electrical log, radioactive logging, acoustic logging, imaging logging and engineering log (as hole diameter, hole deviation) etc.
Well logging comprises the method such as nutural potential logging and mud log.
Wherein, nutural potential logging belongs to a part for electrical log, is mainly used in dividing section plane of sand shale.What nutural potential logging was measured is the curve that natural potential changes with well depth potential difference.Because nutural potential logging has obvious abnormal show at permeable formation place, therefore, it is one of division and the important method evaluating reservoir.In well, when formation water salt concentration is different with drilling fluid salt concentration, cause the diffusion of ion and rock particles to the suction-operated of ion; When strata pressure is different from drilling liquid pressure, in formation void, produce filtration.These electrochemical process produced at Around A Borehole can produce nature electromotive force, form natural electric field.The change records of down-hole natural potential is become the curve with well depth change, is spontaneous potential curve.
Described drilling fluid is in drilling process, the cyclic flusher medium used in Oil/gas Well well.Drilling fluid is the blood of drilling well, also known as drilling fluid.Drilling fluid can be divided into clear water, mud, compressed air and oil-base mud etc. by constituent.Clear water is the drilling fluid used the earliest, without the need to process, easy to use, the area being applicable to complete rock stratum He having abundant water resources.Mud is widely used drilling fluid, is mainly applicable to the hole wall unstable formations such as loose, cranny development, easily collapsing and breaking, water-swellable peel off.
Mud log adopts mud resistivity measuring probe usually, is the mud resistivity in order to measure in drilling process in arbitrary degree of depth.
Mud resistivity measures point two parts: mud electrode system and mud measuring circuit.Mud electrode system is made up of four electrode retaining collars: emission electrode A ', collecting electrode B ', measurement electrode M ' and measurement electrode N '.
In prior art, logging instrument bottommost is also connected with seal plug, plays the effect of damping and terminal resistance in well logging, can disassemble with the parts on logging instrument top or assemble, and sealing plug is called well logging end nose.
Please further refer to the structural representation that Fig. 1-4, Fig. 1 is a kind of set-up mode of natural potential well logging instrument in prior art; Fig. 2 is the structural representation of a kind of set-up mode of mud log instrument in prior art; Fig. 3 is the structural representation of a kind of set-up mode of end nose of logging well in prior art; Fig. 4 is the structural representation of the another kind of set-up mode of end nose of logging well in prior art.
As Figure 1-3, existing natural potential well logging instrument, mud log instrument and well logging end nose are respectively independently logger or auxiliary equipment.As shown in Figure 1, natural potential well logging instrument comprises top sub 110, lower connector 120 and natural potential electrode retaining collar 130, top sub 110 and lower connector 120 are respectively used to be connected with the upper member of logging instrument and lower member, and natural potential electrode retaining collar 130 is for detecting natural potential.As shown in Figure 2, mud log instrument comprises top sub 210, lower connector 220 and mud resistivity electrode retaining collar 230.As shown in Figure 3 and Figure 4, well logging end nose comprises top sub 310 and bottom damping portion 320, and bottom damping portion 320 can be set to hemispherical, also can be set to tapered.
When adopting above-mentioned logging instrument to log well, natural potential well logging instrument, mud log instrument and well logging end nose is needed to assemble respectively, be connected with the parts of upper and lower, that is, if the measurement to natural potential and mud resistivity will be realized simultaneously, play cushioning effect simultaneously, the assembling of three parts must be completed, because assembling process is loaded down with trivial details, cause the poor in timeliness of logging well.Moreover, above-mentioned each parts axially connecting successively all at logging instrument, cause assembling the whole logger formed and there is more jointing, and length is long, adds application risk.In addition, above-mentioned logging instrument maintenance and to change accessory all comparatively complicated.
In view of this, urgently for above-mentioned technical problem, optimal design logging instrument of the prior art, a kind of well logging of design end nose, realizes the measurement of natural potential and mud resistivity, improves the integrated level of equipment while playing cushioning effect.
Utility model content
The purpose of this utility model is for providing nose at the bottom of a kind of logging instrument and well logging thereof, integrate the function of natural potential well logging instrument, mud log instrument and well logging end nose, improve device integration, simplify the structure of logging instrument, shorten the entire length of logging instrument.
For solving the problems of the technologies described above, the utility model provides nose at the bottom of a kind of well logging of logging instrument, comprise the top sub of the upper member for connecting logging instrument and be connected to the damping portion of its underpart, described damping portion convergent from top to bottom, described damping portion comprises the emission electrode of mutually insulated, Integrated electrode, first measurement electrode and the second measurement electrode, described Integrated electrode is the integrated of natural potential electrode and collecting electrode, described collecting electrode and described emission electrode are formed measures electric field, described first measurement electrode and described second measurement electrode are in described measurement electric field, so that the resistance according to both obtains mud resistivity, described natural potential electrode is connected with ground electrodes, to detect natural potential.
Nose at the bottom of well logging of the present utility model, damping portion is provided with emission electrode, Integrated electrode, the first measurement electrode and the second measurement electrode, and wherein, Integrated electrode is collecting electrode and natural potential electrode is integrated forms; In mud resistivity measuring circuit, Integrated electrode is as collecting electrode, formed with emission electrode and measure electric field, first measurement electrode and the second measurement electrode are in this measurement electric field, resistance between the two can be obtained by detecting voltage and current between the two, and then obtain mud resistivity; In self-potential survey circuit, Integrated electrode, as natural potential electrode, can be connected with ground electrodes, to obtain the natural potential on residing stratum by the voltage measuring its relative ground.Meanwhile, the damping portion on well logging end nose can also play cushioning effect, to avoid clashing into the sharp pounding caused, can prevent instrument damage.
Visible, nutural potential logging and mud log are integrated on well logging end nose by the application, three is integrated in one, improves the integrated level of logging instrument, simplify the structure of logging instrument; What is more important, because all parts on logging instrument is connected successively, after integrated, shorten the length of whole logging instrument largely from top to bottom, for the underground work of circumstance complication, the shortening of tool length will significantly reduce application risk, improve property easy to use; Moreover, after integrated, decrease in well logging the parts needing assembly and disassembly, can effectively improve well logging timeliness; Finally, the shortening of logging instrument length and the minimizing of parts to be connected reduce maintenance and change the complexity of accessory.
Alternatively, also comprise circuit board, described circuit board comprises the first measuring circuit for detecting mud resistivity and the second measuring circuit for detecting natural potential, and described emission electrode, described first measurement electrode, described second measurement electrode and described Integrated electrode are all electrically connected with described circuit board.
Alternatively, described circuit board outside is coated with containment vessel, and described containment vessel is connected with described top sub and described damping portion respectively with its upper and lower two ends.
Alternatively, be also provided with bearing disc in described containment vessel, described bearing disc is arranged on the junction of described containment vessel and described damping portion.
Alternatively, be also provided with the bottom connector be electrically connected with described circuit board in described containment vessel, described bottom connector is used for being electrically connected with described emission electrode, described first measurement electrode, described second measurement electrode and described Integrated electrode.
Alternatively, be also provided with the upper connectors be electrically connected with described circuit board in described top sub, described upper connectors is electrically connected with the upper member of logging instrument, and described circuit board also comprises three measuring circuit corresponding with described upper member.
Alternatively, described damping portion comprises the main body adopting non-metal insulating material to make, described emission electrode, described first measurement electrode, described second measurement electrode and described Integrated electrode are spaced apart and arranged in described main body from the bottom to top successively, and are insulated by described main body.
Alternatively, described emission electrode, described first measurement electrode, described second measurement electrode and described Integrated electrode and to be describedly bulk curedly integrated.
Alternatively, in described emission electrode, described first measurement electrode, described second measurement electrode and described Integrated electrode, adjacent spacing is between the two determined according to transmitting power.
The utility model also provides a kind of logging instrument, comprises nose at the bottom of the well logging described in above-mentioned any one.
Nose at the bottom of the well logging that logging instrument of the present utility model comprises described in above-mentioned any one, therefore the technique effect that above-mentioned any one well logging end nose produces all is applicable to logging instrument of the present utility model, repeats no more herein.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of set-up mode of natural potential well logging instrument in prior art;
Fig. 2 is the structural representation of a kind of set-up mode of mud log instrument in prior art;
Fig. 3 is the structural representation of a kind of set-up mode of end nose of logging well in prior art;
Fig. 4 is the structural representation of the another kind of set-up mode of end nose of logging well in prior art;
Fig. 5 provides by the utility model the structural representation of well logging end nose in a kind of detailed description of the invention;
Fig. 6 is the internal construction connection diagram of the end nose of well logging shown in Fig. 5;
Fig. 7 carries out the principle schematic of logging well for adopting nose at the bottom of the well logging shown in Fig. 5.
In Fig. 1-4:
Top sub 110, lower connector 120, natural potential electrode retaining collar 130, top sub 210, lower connector 220, mud resistivity electrode retaining collar 230, top sub 310, bottom damping portion 320
In Fig. 5-7:
Top sub 1, damping portion 2, main body 21, containment vessel 3, circuit board 4, bearing disc 5, bottom connector 6, upper connectors 7, emission electrode A, Integrated electrode B/SP, the first measurement electrode M, the second measurement electrode N
Detailed description of the invention
Core of the present utility model is for providing nose at the bottom of a kind of logging instrument and well logging thereof, integrate the function of natural potential well logging instrument, mud log instrument and well logging end nose, improve device integration, simplify the structure of logging instrument, shorten the entire length of logging instrument.
In order to make those skilled in the art understand the technical solution of the utility model better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 5, the utility model provides nose at the bottom of a kind of well logging of logging instrument, at the bottom of this well logging, nose is arranged on the bottom of logging instrument, comprise top sub 1 and the damping portion 2 being connected to top sub 1 bottom, top sub 1 is for being connected with the upper member of logging instrument, and damping portion 2 is mainly used in alleviating logging instrument vibrations in use.
In nose at the bottom of well logging of the present utility model, damping portion 2 also comprises emission electrode A, Integrated electrode B/SP, the first measurement electrode M and the second measurement electrode N, each electrode mutually insulated, and wherein, Integrated electrode B/SP is collecting electrode B and natural potential electrode SP is integrated forms.In mud resistivity measuring circuit, Integrated electrode B/SP uses as collecting electrode B, itself and emission electrode A, first measurement electrode M and the second measurement electrode N complements each other to form mud electrode system, now, measurement electric field is jointly formed as the Integrated electrode B/SP of collecting electrode B and emission electrode A, first measurement electrode M and the second measurement electrode N is in this measurement electric field, so, resistance between the two can be drawn by the potential difference between detection first measurement electrode M and the second measurement electrode N and the Current calculation flowing through both loops, place, and then acquisition mud resistivity.In self-potential survey circuit, Integrated electrode B/SP is as natural potential electrode SP, now it can be electrically connected with ground electrodes, because ground electrodes is constant, now, the potential difference detected between natural potential electrode SP and ground can obtain the natural potential on stratum residing for nature potential electrode SP.
Visible, at the bottom of well logging of the present utility model, in fact nose can be called nose at the bottom of natural potential-mud log, specifically refer to and nutural potential logging and mud log are integrated on well logging end nose, while measuring natural potential and mud resistivity, play again the function of nose on earth.
Really as stated in the Background Art, in traditional logging instrument, nutural potential logging part, mud log part and well logging end nose are three different parts of logging instrument, and three is series connection at the whole length direction of logging instrument, that is, three all takies certain length.And adopt nose at the bottom of well logging of the present utility model, due to its by nutural potential logging, mud log and well logging the end nose function i ntegration in one, integrated level is higher, be equivalent to without the need to arranging separately nutural potential logging part and mud log part, also just correspondingly eliminate nutural potential logging part and the length shared by mud log part in prior art, shorten the entire length of logging instrument largely.It will be understood by those skilled in the art that for the underground work that operating mode is comparatively complicated, the shortening of logging instrument length is vital for reduction operating risk and accident rate; The application looks for another way, and from integrated angle, achieves the shortening to logging instrument length.
Moreover, because well logging end nose is arranged on the bottom of logging instrument, only need arrange a top sub 1 to be connected with upper member, in addition the omission of nutural potential logging part and mud log part, correspondingly eliminate the interface be connected with both, then the total number of interface reduces, and makes to connect more simple, is easy to operation; The minimizing of interface and the simplification of mating process can reduce fault rate; The parts that logging instrument connects are less, make maintenance and keep in repair comparatively simple and convenient, being easy to overhaul.
In addition, in the application, by natural potential electrode SP and the described Integrated electrode B/SP of the integrated formation of collecting electrode B, that is, natural potential electrode SP and collecting electrode B shares an electrode.When carrying out mud resistivity measurement, Integrated electrode B/SP, can as the reference point of voltage zero current potential as collecting electrode B, and now, emission electrode A can tranmitting frequency be the alternating current of 5-10KHZ usually; According to principle of electric field, electric current flows to low potential from high potential, and the electric current that emission electrode A sends, after mud, gets back to collecting electrode B, and therefore, when thinking as collecting electrode B, Integrated electrode B/SP is constant zero potential value.Carry out natural potential when detecting, Integrated electrode B/SP as natural potential electrode SP, and can be communicated to ground by inductive choke coil, measures this voltage relative to ground electrodes; Inductive choke coil has the effect that resistance exchanges logical direct current, therefore the alternating current that emission electrode A sends by choke coil, cannot only have the direct current natural electric current in stratum to pass through, thus achieve the measurement of stratum natural current potential; Now, relative to ground electrodes, the voltage of natural potential electrode SP is not constant, but changes with the change of stratum natural potential in underground moving process.In other words, Integrated electrode B/SP achieves two functions: when measuring mud resistivity, Integrated electrode B/SP is constant voltage relative to emission electrode A; When measuring natural potential, Integrated electrode B/SP is for ground electrodes, and its voltage is change.Those skilled in the art should to being appreciated that Integrated electrode B/SP can use as collecting electrode B and natural potential electrode SP, synchronously to complete the measurement of mud resistivity and natural potential simultaneously; Integrated electrode B/SP described in the application can use as collecting electrode B and natural potential electrode SP and refer to simultaneously as both uses, not refers to that Integrated electrode B/SP needs to convert between according to operating mode.
Can be constant just because of the magnitude of voltage of collecting electrode B when mud resistivity is measured, the application utilizes this characteristic, collecting electrode B and natural potential electrode SP is carried out integrated, to form the Integrated electrode B/SP being applicable to mud resistivity measurement and self-potential survey simultaneously.Adopt Integrated electrode B/SP, on the one hand, can reduce and realize natural potential detection and the electrode sum needed for mud resistivity detection, to simplify the setting of electrode system, make the layout of electrode system in damping portion 2 more reasonable; On the other hand, after natural potential electrode SP is integrated in collecting electrode B, a set of electrode system is set separately without the need to the detection for natural potential, not only simplify structure, also improve detection efficiency and processing speed; What is more important, collecting electrode B is in the top of whole electrode system, and nose at the bottom of whole well logging is that from top to bottom convergent is arranged, so, the surface area of collecting electrode B is maximum, maximum with the contact area of mud, contact resistance is minimum, thus the more reliable and stable signal of telecommunication can be obtained, so, natural potential electrode SP is integrated in the accuracy that collecting electrode B just effectively can improve testing result.
As herein described is up and down reference with the earth's crust, and being vertical perpendicular to the direction of the earth's crust, under the direction that is directed upwards towards the earth's crust of hanging down is, the direction away from the earth's crust is upper.
As shown in Figure 5, at the bottom of the well logging of the application, nose can also comprise containment vessel 3, and the upper end of containment vessel 3 is connected with top sub 1, and lower end is connected with damping portion 2.The application can also comprise circuit board 4, and circuit board 4 can be built in containment vessel 3, to be protected by containment vessel 3 pairs of circuit boards 4.In detail, circuit board 4 comprises the first measuring circuit and the second measuring circuit, and wherein, the first measuring circuit is for detecting mud resistivity, and the second measuring circuit is for detecting natural potential.Simultaneously, emission electrode A, the first measurement electrode M, the second measurement electrode N and Integrated electrode B/SP all can be electrically connected with described circuit board 4, so that each electrode by signal transmission to circuit board 4, data processing is carried out, to obtain mud resistivity and natural potential by measuring circuit corresponding on circuit board 4.
Electrical connection described herein refers to, realizes conduction in wired or wireless manner and connects, to transmit a kind of connected mode of the signal of telecommunication.
It should be noted that, in the structure chart shown in Fig. 5, because the form of structure of top sub 1 is various; the application only uses box indicating; its concrete structure is not shown, about the structure of top sub 1 and with reference to prior art, please repeat no more with the connected mode of containment vessel 3 herein.
Please further refer to Fig. 6; in containment vessel 3, bearing disc 5 can also be set; and bearing disc 5 can be arranged on the junction of containment vessel 3 and damping portion 2; the inside of well logging end nose and external environment are completely cut off; play the effect of pressure bearing and seal, avoid well logging liquid etc. enter well logging end nose inside and damage internal components such as circuit board 4 grade.
Further; in containment vessel 3, bottom connector 6 can also be set; bottom connector 6 is electrically connected with circuit board 4; and for being electrically connected with described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP; that is; each electrode can realize the electrical connection with circuit board 4 by described bottom connector 6, and bottom connector 6 is equivalent to an intermediate connector or a connecting interface.
Further again, can also arrange upper connectors 7 in top sub 1, this upper connectors 7 can be electrically connected with the circuit board 4 in containment vessel 3, and for being electrically connected with the upper member of logging instrument; Meanwhile, circuit board 4 can also comprise three measuring circuit corresponding with upper member, to process the signal of telecommunication that upper member is transmitted, to obtain corresponding testing result.
As shown in Figure 6, connection, the bottom connector 6 of upper connectors 7 and circuit board 4 can adopt connecting line to realize with the connection of circuit board 4, and the parts that other also can be adopted can to carry out being electrically connected realize.Upper connectors 7 and/or bottom connector 6 are specifically as follows the slotting platy structure with some connection jacks, and the intermediate member that also can realize electrical connection for other, concrete form please refer to prior art, repeats no more herein.
Moreover bearing disc 5 specifically can be arranged on the below of bottom connector 6, as shown in Figure 5, to improve containment vessel 3 and the connection reliability of damping portion 2, avoid bottom connector 6 to affect and connect; And bottom connector 6 and circuit board 4 are in the centre position of containment vessel 3 inside usually, so that containment vessel 3 effectively can protect three, avoid because conquassation etc. causes damage to three; Or circuit board 4 can be in the junction of containment vessel 3 and top sub 1, namely circuit board 4 can major part be in containment vessel 3, fraction is in top sub 1.The zone line that certain distance formed, for its upper and lower two ends, to be expanded by containment vessel 3 in the centre position of described containment vessel 3 to its upper and lower two ends at the center of above-below direction.
For ease of describing, each electrode described herein refers to and described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP.
On the basis of the above, damping portion 2 can comprise main body 21, main body 21 can adopt non-metal insulating material to make, then, described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP can be spaced apart and arranged in main body 21 from the bottom to top successively.On the one hand, nonmetals can play shock absorbing effect, avoid clashing into the sharp pounding caused, thus prevent instrument damage to protect logging instrument; On the other hand, each electrode can realize mutually insulated by main body 21, without the need to arranging insulation system separately.
Particularly, each electrode can be cured as one with main body 21, namely described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP can be cured as one with main body 21, to form the damping portion 2 of integrative-structure, as shown in Figure 5.After solidification, the relative position of each electrode is fixed, and ensure that accurately carrying out of detection, the relative motion between avoiding because of each electrode and affect testing result; Moreover the structure being cured as one makes damping portion 2 have structural stability, even if there is shock to cause judder, also can realize effective damping, especially can avoid the reliability of positioning because of each electrode of vibration effect.
In addition, in described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP, adjacent spacing is between the two in preset range.Specifically, putting in order between emission electrode A, Integrated electrode B/SP, the first measurement electrode M and the second measurement electrode N requires strict control, each electrode arranges according to said sequence, can be in measure in electric field with the electrode making the first measurement electrode M and second measure and (put in order and be not limited to above-mentioned embodiment, as long as meet the first measurement electrode M and the second measurement electrode N to be in the requirement of measuring in electric field); Otherwise the potential difference between the first measurement electrode M and the second measurement electrode N is zero, may detect and obtain mud resistivity.Meanwhile, the spacing between two adjacent electrodes also will be in preset range, and spacing can be determined according to the transmitting power of current instrument, and the transmitting power of the larger requirement of spacing is larger; When spacing reduces, certainty of measurement can corresponding reduction.
Below in conjunction with Fig. 7, testing process and principle are described.
In detail, mud resistivity measurement comprises mud electrode system and mud measuring circuit two parts, mud electrode system comprises described emission electrode A, described first measurement electrode M, described second measurement electrode N and described Integrated electrode B/SP, and wherein, Integrated electrode B/SP is as collecting electrode B; Mud measuring circuit is described first measuring circuit, specifically comprise radiating circuit and testing circuit, the square-wave signal of constant current launched by radiating circuit to collecting electrode B by emission electrode A, testing circuit detects the electric potential signal of the first measurement electrode M and the second measurement electrode N, to obtain resistance value by current signal and voltage signal, and then to calculate mud resistivity.
First measurement electrode M and the second measurement electrode N is between emission electrode A and collecting electrode B, is voltage U between the two for measuring distance in mud; Because emission electrode A launches constant current signal, and now the current potential of collecting electrode B is constant null value, therefore the electric current I in whole loop can be obtained by emission electrode A.Then, according to Ohm's law R=U/I, the mud resistance between the first measurement electrode M and the second measurement electrode N can be obtained, then according to the electrode system K value of nose of the current end, mud resistivity ρ=K*R can be obtained.Wherein, K is K factor, its planform with electrode system and size relevant.
About natural potential, as mentioned above, when Integrated electrode B/SP is as natural potential electrode SP, its coil exchanging logical direct current by resistance is electrically connected with ground, electric current due to natural electric field is DC current, the measurement of the alternating current disturbance natural potential that emission electrode A just can be stoped to launch; Now, the potential difference between natural potential electrode SP and ground only may be caused by natural electric field, thus realizes the measurement of stratum natural current potential.In other words, namely the change of the potential difference between natural potential electrode SP and ground has reacted the change of natural potential, and then can according to the change of the change records natural potential of well depth, to form spontaneous potential curve.
As shown in Figure 7, in concrete processing procedure, difference amplifier can be connected and power amplifier, oscillator etc. process signal, to obtain accurate data.
The utility model still further provides a kind of logging instrument, adopts nose at the bottom of the well logging described in above-mentioned any one.The parts comprised due to logging instrument are comparatively large, and the structure of each parts is comparatively complicated, specifically please refer to prior art, repeats no more herein.
Above nose at the bottom of a kind of logging instrument provided by the utility model and well logging thereof is described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (10)
1. nose at the bottom of the well logging of a logging instrument, comprise the top sub (1) of the upper member for connecting logging instrument and be connected to the damping portion (2) of its underpart, described damping portion (2) convergent from top to bottom, it is characterized in that, described damping portion (2) comprises the emission electrode (A) of mutually insulated, Integrated electrode (B/SP), first measurement electrode (M) and the second measurement electrode (N), what described Integrated electrode (B/SP) was natural potential electrode (SP) and collecting electrode (B) is integrated, described collecting electrode (B) and described emission electrode (A) are formed measures electric field, described first measurement electrode (M) and described second measurement electrode (N) are in described measurement electric field, so that the resistance according to both obtains mud resistivity, described natural potential electrode (SP) is connected with ground electrodes, to detect natural potential.
2. well logging end nose as claimed in claim 1, it is characterized in that, also comprise circuit board (4), described circuit board (4) comprises the first measuring circuit for detecting mud resistivity and the second measuring circuit for detecting natural potential, and described emission electrode (A), described first measurement electrode (M), described second measurement electrode (N) and described Integrated electrode (B/SP) are all electrically connected with described circuit board (4).
3. well logging end nose as claimed in claim 2; it is characterized in that; described circuit board (4) outside is coated with containment vessel (3), and described containment vessel (3) is connected with described top sub (1) and described damping portion (2) respectively with its upper and lower two ends.
4. well logging end nose as claimed in claim 3; it is characterized in that; also be provided with bearing disc (5) in described containment vessel (3), described bearing disc (5) is arranged on the junction of described containment vessel (3) and described damping portion (2).
5. well logging end nose as claimed in claim 3; it is characterized in that; also be provided with the bottom connector (6) be electrically connected with described circuit board (4) in described containment vessel (3), described bottom connector (6) is for being electrically connected with described emission electrode (A), described first measurement electrode (M), described second measurement electrode (N) and described Integrated electrode (B/SP).
6. well logging end nose as claimed in claim 5, it is characterized in that, the upper connectors (7) be electrically connected with described circuit board (4) is also provided with in described top sub (1), described upper connectors (7) is electrically connected with the upper member of logging instrument, and described circuit board (4) also comprises three measuring circuit corresponding with described upper member.
7. nose at the bottom of the well logging as described in any one of claim 1-6, it is characterized in that, described damping portion (2) comprises the main body (21) adopting non-metal insulating material to make, described emission electrode (A), described first measurement electrode (M), described second measurement electrode (N) and described Integrated electrode (B/SP) are spaced apart and arranged in described main body (21) from the bottom to top successively, and are insulated by described main body (21).
8. well logging end nose as claimed in claim 7, it is characterized in that, described emission electrode (A), described first measurement electrode (M), described second measurement electrode (N) and described Integrated electrode (B/SP) and described main body (21) are cured as one.
9. well logging end nose as claimed in claim 5, it is characterized in that, in described emission electrode (A), described first measurement electrode (M), described second measurement electrode (N) and described Integrated electrode (B/SP), adjacent spacing is between the two determined according to transmitting power.
10. a logging instrument, is characterized in that, comprises nose at the bottom of the well logging described in any one of the claims 1-9.
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| CN201520311752.XU CN204591256U (en) | 2015-05-14 | 2015-05-14 | A kind of logging instrument and well logging end nose thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285638A (en) * | 2015-05-14 | 2017-01-04 | 万瑞（北京）科技有限公司 | A kind of logging instrument and well logging end nose thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285638A (en) * | 2015-05-14 | 2017-01-04 | 万瑞（北京）科技有限公司 | A kind of logging instrument and well logging end nose thereof |
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