CN109424358A - High-power resistivity logging while drilling sender unit - Google Patents
High-power resistivity logging while drilling sender unit Download PDFInfo
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- CN109424358A CN109424358A CN201710738800.7A CN201710738800A CN109424358A CN 109424358 A CN109424358 A CN 109424358A CN 201710738800 A CN201710738800 A CN 201710738800A CN 109424358 A CN109424358 A CN 109424358A
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- 238000005553 drilling Methods 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 230000005284 excitation Effects 0.000 claims abstract description 8
- 230000003139 buffering effect Effects 0.000 claims description 14
- 230000013011 mating Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 8
- 210000004209 hair Anatomy 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/16—Drill collars
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Geophysics (AREA)
- Electronic Switches (AREA)
Abstract
The present invention provides a kind of high-power resistivity logging while drilling sender unit, comprising: which drill collar ontology, offers the first groove and the second groove thereon, the first groove is annular groove, second groove is rectangular recess, wherein the first groove and the second groove are connected to by first lead hole；Transmitting coupling magnet ring, it includes ring-shaped core, magnet ring coiling, and it is mounted in the first groove, drive circuit board, it includes excitation alternating current generation circuit, and be mounted in the second groove, the output lead end of circuit is connected to the both ends of the magnet ring coiling of transmitting coupling magnet ring by first lead hole, and excitation AC signal is transmitted on transmitting coupling magnet ring and is emitted.It does not need the structure to insulate on drill collar design in structure, influences on the mechanical performance of drill collar very small.Transformer is not needed, the size of drill collar fluting is effectively reduced.Effective emitting voltage and electric current are farthest improved by positive decommutation.
Description
Technical field
The present invention relates to oil exploration drilling field of engineering technology more particularly to a kind of high-power resistivity logging while drilling signal hairs
Injection device.
Background technique
It, can be visual and clear by pit shaft week using being logged well under the conditions of with brill as resistivity logging tool with being drilled to
The resistivity information on side, and the crucial geological informations such as geological structure, crack and tomography distribution can be gone out according to these message reflections.
Therefore, be drilled to as resistivity logging tool by more and more widely be applied to petroleum exploration and development drilling process in.?
With being drilled in picture resistivity logging tool, determine that one of the key of resistivity measurement effect is exactly the design of its transmitting module.Hair
Efficiency and the power for penetrating module design are higher, and the signal for being transferred to receiving module by stratum is stronger, more can be clearly anti-
Reflect the resistivity information on stratum.
However, since the structure that drilling course works as Instrumental is restricted, the hair of traditional cable resistance rate logger
Structure and circuit is penetrated all to be difficult to being drilled to as applying in resistivity logging tool.This is primarily due under the conditions of with brill, respectively
Kind instrument requires to be designed to drill collar form, very high to its requirement of mechanical strength.And traditional cable resistance rate logger
The design of transformer of multiple insulating Designs and complexity is needed, to realize powerful transmitting signal, this is just needed will be complete
Drill collar truncation, is inserted into insulation system.Such as the prior art provides a kind of micro-resisitivity image device and its transmitting
Circuit (ZL201410344449.X), but such design is not able to satisfy to the very high requirement of its mechanical strength.
Therefore, it is necessary to develop a kind of emitter and circuit that can adapt to drill collar installation.
Summary of the invention
Object of the present invention is to overcome shortcoming in the prior art, a kind of high-power resistivity logging while drilling signal transmitting is provided
Device, described device include:
Drill collar ontology, offers the first groove and the second groove thereon, and first groove is annular groove, and described second
Groove is rectangular recess, wherein first groove and the second groove are connected to by first lead hole；
Transmitting coupling magnet ring comprising ring-shaped core, magnet ring coiling, and be mounted in first groove,
Drive circuit board comprising excitation alternating current generation circuit, and be mounted in second groove, the circuit
Output lead end by the first lead hole be connected to it is described transmitting coupling magnet ring magnet ring coiling both ends, by excitation
AC signal, which is transmitted on the transmitting coupling magnet ring, to be emitted.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, the transmitting couple magnet ring packet
It includes magnet ring and inserts and refer to mating interface, the magnet ring, which is inserted, refers to mating interface to be socketed in the various pieces of the transmitting coupling magnet ring
In first groove of described this ground of drill collar.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, the drive circuit board include:
First matching capacitance, the second matching capacitance, third matching capacitance, wherein one end of the magnet ring coiling is connected to the first matching
One end after capacitor, the second matching capacitance, third matching capacitance are in parallel；And
The other end of current-limiting resistance, the magnet ring coiling is connected to one end of the current-limiting resistance.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, the drive circuit board also wrap
It includes: the first upper switch PMOS tube, the second upper switch PMOS tube, the first lower switch NMOS tube and the second lower switch NMOS tube, wherein
The other end and institute after first matching capacitance, second matching capacitance, the third matching capacitance are in parallel
State the drain electrode of the first upper switch PMOS tube, 3 points of the drain electrode of the first lower switch NMOS tube be connected, the current-limiting resistance it is another
End, the drain electrode of the second upper switch PMOS tube, 3 points of drain electrode of the second lower switch NMOS tube be connected.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, the drive circuit board also wrap
It includes:
First triode, the second triode, 3rd resistor, the first input buffering NOT gate, the 4th resistance, the 5th resistance, the
Three triodes, the 4th triode, wherein
The base stage of first triode and the base stage of the 4th triode are connected to digital power VDD, and described first
The emitter of triode is connected to one end of the 3rd resistor, the collector of first triode, the second resistance
One end, 3 points of base stage of second triode be connected,
The collector of second triode is connected with one end of the first resistor, the emitter of second triode
It is connected with the grid of the first upper switch PMOS tube, the first input buffers under the output of NOT gate, one end of 3rd resistor, first
3 points of grid for switching NMOS tube are connected.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, the drive circuit board also wrap
It includes: the 6th resistance, the second input buffering NOT gate, electric capacity of voltage regulation, wherein
The first input buffering output of NOT gate, one end of 3rd resistor, 3 points of grid of the first lower switch NMOS tube
It is connected, one end of second resistance is connected to the emitter of the first triode,
The source electrode of first upper switch PMOS tube, the source electrode of the second upper switch PMOS tube, the other end of first resistor, the second electricity
The other end of resistance, the other end of the 4th resistance, the other end of the 5th resistance, one end of electric capacity of voltage regulation are commonly connected to analog power
On VCC,
The source electrode of first lower switch NMOS tube, the source electrode of the second lower switch NMOS tube, electric capacity of voltage regulation the other end connect jointly
Ground is connected to,
Second input buffering NOT gate, output, one end of the 6th resistance, the second lower switch NMOS tube three point phase of grid
Even.
Preferably, high-power resistivity logging while drilling sender unit according to the present invention, in the drive circuit board,
The emitter of the third transistor is connected to one end of the 6th resistance, the collector of the third transistor,
One end of four resistance, 3 points of base stage of the 4th triode be connected,
The collector of 4th triode is connected with one end of the 4th resistance,
The emitter of 4th triode is connected with the grid of the second upper switch PMOS tube,
One end of 5th resistance is connected to the emitter of third transistor.
High-power resistivity logging while drilling sender unit according to the present invention and driving circuit have the advantage that as follows:
It does not need the structure to insulate on drill collar design in structure, influences on the mechanical performance of drill collar very small.Circuit is set
Meter aspect does not need transformer, effectively reduces the size of drill collar fluting.It is farthest improved effectively by positive decommutation
Emitting voltage and electric current.The matching capacitance for accessing two or more is in parallel, is combined and is configured by capacitance values, realizes most
Good matching improves the emission effciency of signal.
Current-limiting resistance is connected in transmitting coupling magnet ring one end, reduces the abnormal current risk near short circuit occur.Wherein, it opens
The control that the upper switch PMOS tube of pass effect and the conducting control electrode of lower switch NMOS tube, i.e. grid are made of double-triode valve respectively
Combination, it can be ensured that upper switch PMOS tube and lower switch NMOS tube will not simultaneously turn on, and guarantee that power supply and ground will not occur for circuit
Short circuit will not occur.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target and other advantages of the invention can be wanted by following specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide to the technical solution of the application or further understanding for the prior art, and constitutes specification
A part.Wherein, the attached drawing for expressing the embodiment of the present application is used to explain the technical side of the application together with embodiments herein
Case, but do not constitute the limitation to technical scheme.
Fig. 1 shows that the structure of high-power resistivity logging while drilling sender unit according to an embodiment of the invention is shown
It is intended to；And
Fig. 2 shows the schematic diagram of transmitting signal generating circuit according to an embodiment of the invention.
Wherein, reference signs list is as follows:
10: drill collar
20: the first grooves
30: transmitting coupling magnet ring
40: first lead hole
50: coupling magnet ring connecting line
60: drive circuit board
70: the second grooves
80: the second fairleads
90: drive circuit board connecting line
31: magnet ring coiling
32: magnet ring, which is inserted, refers to mating interface
101: the first matching capacitances
102: the second matching capacitances
103: third matching capacitance
104: current-limiting resistance
105: the first upper switch PMOS tube
106: the second upper switch PMOS tube
107: the first lower switch NMOS tubes
108: the second lower switch NMOS tubes
109: first resistor
110: second resistance
111: the first triodes
112: the second triodes
113: 3rd resistor
114: the first input buffering NOT gates
115: the four resistance
116: the five resistance
117: third transistor
118: the four triodes
119: the six resistance
120: the second input buffering NOT gates
121: electric capacity of voltage regulation.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching relevant art effect can fully understand and implement.This Shen
Please each feature in embodiment and embodiment, can be combined with each other under the premise of not colliding, be formed by technical solution
It is within the scope of the present invention.
As shown in Figure 1, which show the structures of high-power resistivity logging while drilling sender unit according to the present invention to show
It is intended to.The device includes drill collar ontology 10, transmitting coupling magnet ring 30,60 three parts of drive circuit board.It is opened on drill collar ontology
Equipped with the first groove 20 and the second groove 70, first groove 20 is annular groove, and second groove 70 is rectangular recess,
Wherein first groove 20 is connected to the second groove 70 by first lead hole 40.
Transmitting coupling magnet ring 30 includes ring-shaped core, magnet ring coiling, and is mounted in first groove 20.
Drive circuit board 60 includes excitation alternating current generation circuit, and is mounted in second groove 70, the electricity
The output lead end on road is connected to the both ends of the magnet ring coiling 50 of the transmitting coupling magnet ring 30 by the first lead hole 40,
Emitted so that excitation AC signal to be transmitted on the transmitting coupling magnet ring 30.
Installation ontology of the drill collar ontology 10 as entire module.First groove 20 and the second groove 70 are all in drill collar ontology
10 outer surface is process, wherein the first groove 20 is an annular, wherein the second groove 70 is rectangular.Described first
Fairlead 40 is connected to the first groove 20 and the second groove 70.Second fairlead, 80 second groove of connection 70 and other function
Groove.The transmitting coupling magnet ring 30 is mounted on the first groove 20.The drive circuit board 60 is mounted in the second groove 70.Institute
It states the coupling connection of magnet ring connecting line 50 to be mounted in first lead hole 40, connection transmitting coupling magnet ring 30 and drive circuit board 60.
60 connecting line of drive circuit board is mounted on the second fairlead 80, connects the groove of drive circuit board 60 and other function.
As shown in Fig. 2, which show the schematic diagrams of the driving circuit in high-power resistivity logging while drilling sender unit.
The circuit is mainly made of transmitting coupling magnet ring 30, coupling magnet ring connecting line 50, dynamic circuit board 60, drive circuit board connecting line 90
Emit signal generating system link.
Transmitting signal generating system as shown in Figure 2 includes: magnet ring coiling 31, slotting mating interface 32, first, the finger of magnet ring
With capacitor 101, the second matching capacitance 102, third matching capacitance 103, current-limiting resistance 104, the first upper switch PMOS tube 105,
Two upper switch PMOS tube 106, the first lower switch NMOS tube 107, the second lower switch NMOS tube 108, the 109, second electricity of first resistor
Hinder the 110, first triode 111, the second triode 112,3rd resistor 113, first input buffering NOT gate 114, the 4th resistance
115, the 5th resistance 116, third transistor 117, the 4th triode 118, the 6th resistance 119, second input buffering NOT gate 120,
Electric capacity of voltage regulation 121.
Wherein, transmitting coupling magnet ring 30 is composed of a pair of of magnet ring finger-cross structure, this can closely be sleeved on drill collar 10
The first groove 20 in.Magnet ring coiling 31 is wound on the coil that 1 circle or more is formed on coupling magnet ring 30, and passes through transmitting coupling magnet ring
30 connecting lines are connected to the circuit of drive circuit board 60.
One end of coupling magnet ring connecting line 50 is connected to the first matching capacitance 101, the second matching capacitance 102, third matching
One end after 103 parallel connection of capacitor.The other end of coupling magnet ring connecting line 50 is connected to one end of current-limiting resistance.
On the other end and first after first matching capacitance 101, the second matching capacitance 102,103 parallel connection of third matching capacitance
Switch the drain electrode of PMOS tube 105,3 points of drain electrode of the first lower switch NMOS tube 107 are connected.The other end of current-limiting resistance 104,
The drain electrode of two upper switch PMOS tube 106,3 points of drain electrode of the second lower switch NMOS tube 108 be connected.
The base stage of first triode 111 and the base stage of the 4th triode 118 are connected to digital power VDD.First triode
111 emitter is connected to one end of 3rd resistor 113.The collector of first triode 111, one end of second resistance 110,
3 points of base stage of two triodes 112 are connected.The collector of second triode 112 is connected with one end of first resistor 109.Two or three
The emitter of pole pipe 112 is connected with the grid of the first upper switch PMOS tube 106.The output of first input buffering NOT gate 114, third
One end of resistance 113,3 points of grid of the first lower switch NMOS tube 107 be connected.
One end of second resistance 110 is connected to the emitter of the first triode 111.The emitter of third transistor 117 connects
It is connected to one end of the 6th resistance 119.The collector of third transistor 117, one end of the 4th resistance 115, the 4th triode 118
3 points of base stage are connected.The collector of 4th triode 118 is connected with one end of the 4th resistance 115.The transmitting of 4th triode 118
Pole is connected with the grid of the second upper switch PMOS tube 106.Second inputs the one of the output, the 6th resistance 119 that buffer NOT gate 120
End, 3 points of grid of the second lower switch NMOS tube 108 be connected.One end of 5th resistance 116 is connected to the hair of third transistor 117
Emitter-base bandgap grading.
The source electrode of first upper switch PMOS tube 105, the source electrode of the second upper switch PMOS tube 106, first resistor 109 it is another
It holds, one end of the other end of second resistance 110, the other end of the 4th resistance 115, the other end of the 5th resistance 116, electric capacity of voltage regulation
121 etc. are all connected to analog power VCC.
The source electrode of first lower switch NMOS tube 107, the source electrode of the second lower switch NMOS tube 108, electric capacity of voltage regulation the other end
121 are all connected to ground.
Compared with prior art, beneficial effects of the present invention are as follows: not needing to insulate on drill collar in structure
Structure design, the mechanical performance of drill collar is influenced very small.By positive decommutation utmostly improve effective emitting voltage and
Electric current.The matching capacitance for accessing two or more is in parallel, is combined and is configured by capacitance values, realizes best match, mentions
High emission efficiency.
In addition, current-limiting resistance is connected in transmitting coupling magnet ring one end, to reduce the abnormal current wind near short circuit occur
Danger.Wherein, the upper switch PMOS tube of on-off action and the conducting control electrode of lower switch NMOS tube are played, i.e., grid is respectively by double three poles
The control combination of pipe composition, it is ensured that upper switch PMOS tube and lower switch NMOS tube will not simultaneously turn on, and guarantee that circuit will not occur
Short circuit will not occur for power supply and ground.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (7)
1. a kind of high-power resistivity logging while drilling sender unit, which is characterized in that described device includes:
Drill collar ontology, offers the first groove and the second groove thereon, and first groove is annular groove, second groove
For rectangular recess, wherein first groove and the second groove are connected to by first lead hole；
Transmitting coupling magnet ring comprising ring-shaped core, magnet ring coiling, and be mounted in first groove,
Drive circuit board comprising excitation alternating current generation circuit, and being mounted in second groove, the circuit it is defeated
Lead end is connected to the both ends of the magnet ring coiling of the transmitting coupling magnet ring by the first lead hole out, by excitation alternation
Current signal, which is transmitted on the transmitting coupling magnet ring, to be emitted.
2. high-power resistivity logging while drilling sender unit as described in claim 1, which is characterized in that the transmitting couples magnetic
Ring, which includes that magnet ring is slotting, refers to that mating interface, the magnet ring insert the various pieces set for referring to mating interface the transmitting to be coupled to magnet ring
It connects in the first groove on the drill collar ontology.
3. high-power resistivity logging while drilling sender unit as claimed in claim 2, which is characterized in that the drive circuit board
It include: the first matching capacitance, the second matching capacitance, third matching capacitance, wherein one end of the magnet ring coiling is connected to first
One end after matching capacitance, the second matching capacitance, third matching capacitance are in parallel；And
The other end of current-limiting resistance, the magnet ring coiling is connected to one end of the current-limiting resistance.
4. high-power resistivity logging while drilling sender unit as claimed in claim 3, which is characterized in that the drive circuit board
Further include: the first upper switch PMOS tube, the second upper switch PMOS tube, the first lower switch NMOS tube and the second lower switch NMOS tube,
Wherein,
The other end after first matching capacitance, second matching capacitance, the third matching capacitance are in parallel and described the
The drain electrode of one upper switch PMOS tube, 3 points of the drain electrode of the first lower switch NMOS tube be connected, the other end of the current-limiting resistance, the
The drain electrode of two upper switch PMOS tube, 3 points of drain electrode of the second lower switch NMOS tube be connected.
5. high-power resistivity logging while drilling sender unit as claimed in claim 4, which is characterized in that the drive circuit board
Further include:
First triode, the second triode, 3rd resistor, the first input buffering NOT gate, the 4th resistance, the 5th resistance, the three or three
Pole pipe, the 4th triode, wherein
The base stage of first triode and the base stage of the 4th triode are connected to digital power VDD, the one or three pole
The emitter of pipe is connected to one end of the 3rd resistor, the collector of first triode, the second resistance one end,
3 points of base stage of second triode are connected,
The collector of second triode is connected with one end of the first resistor, the emitter of second triode and institute
The grid for stating the first upper switch PMOS tube is connected, the first input buffering output of NOT gate, one end of 3rd resistor, the first lower switch
3 points of grid of NMOS tube are connected.
6. high-power resistivity logging while drilling sender unit as claimed in claim 5, which is characterized in that the drive circuit board
Further include: the 6th resistance, the second input buffering NOT gate, electric capacity of voltage regulation, wherein
The first input buffering output of NOT gate, one end of 3rd resistor, 3 points of grid of the first lower switch NMOS tube be connected,
One end of second resistance is connected to the emitter of the first triode,
The source electrode of first upper switch PMOS tube, the source electrode of the second upper switch PMOS tube, the other end of first resistor, second resistance
The other end, the other end of the 4th resistance, the other end of the 5th resistance, one end of electric capacity of voltage regulation are commonly connected to analog power VCC
On,
The source electrode of first lower switch NMOS tube, the source electrode of the second lower switch NMOS tube, electric capacity of voltage regulation the other end be commonly connected to
Ground,
Second input buffering NOT gate, output, one end of the 6th resistance, 3 points of grid of the second lower switch NMOS tube be connected.
7. high-power resistivity logging while drilling sender unit as claimed in claim 6, which is characterized in that in the driving circuit
In plate,
The emitter of the third transistor is connected to one end of the 6th resistance, the collector of the third transistor, the 4th electricity
One end of resistance, 3 points of base stage of the 4th triode be connected,
The collector of 4th triode is connected with one end of the 4th resistance,
The emitter of 4th triode is connected with the grid of the second upper switch PMOS tube,
One end of 5th resistance is connected to the emitter of third transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710738800.7A CN109424358B (en) | 2017-08-24 | 2017-08-24 | High-power resistivity signal transmitting device while drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710738800.7A CN109424358B (en) | 2017-08-24 | 2017-08-24 | High-power resistivity signal transmitting device while drilling |
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| CN109424358A true CN109424358A (en) | 2019-03-05 |
| CN109424358B CN109424358B (en) | 2021-08-24 |
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