CN106121638A - A kind of measurement while drilling downhole system coaxially connected based on three cores - Google Patents
A kind of measurement while drilling downhole system coaxially connected based on three cores Download PDFInfo
- Publication number
- CN106121638A CN106121638A CN201610764782.5A CN201610764782A CN106121638A CN 106121638 A CN106121638 A CN 106121638A CN 201610764782 A CN201610764782 A CN 201610764782A CN 106121638 A CN106121638 A CN 106121638A
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- battery
- inserting tube
- pipe nipple
- power supply
- pulser
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- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 7
- 210000002445 nipple Anatomy 0.000 claims description 51
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 18
- 238000010248 power generation Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 6
- 230000037361 pathway Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a kind of measurement while drilling downhole system coaxially connected based on three cores, belong to oil exploration drilling measuring equipment field, including three buses, public, female connector, pulser, power supply, electronics inserting tube, gamma inserting tube and end nose, three buses are respectively power line (VPWR), ground wire (GND), instrument serial communication bus (TSB), pulser, power supply, electronics inserting tube, gamma inserting tube and end nose are sequentially connected with, power supply, electronics inserting tube, electrical equipment adjacent in gamma inserting tube and end nose is by public affairs, female connector is electrically connected, Male connector is with two sections of cylinders protruded and umbilicate circular groove, female connector is with the cylinder of two concave ends and the middle cylinder protruded, on female connector, the cylindrical inner wall of two concave ends is provided with arc convex.It is few that this system connects cable core number, and reliability is high, and this system can mount LWD instrument very easily simultaneously.
Description
Technical field
The invention belongs to oil exploration drilling measuring equipment field, particularly relate to a kind of based on three cores coaxially connected with brill
Measure downhole system.
Background technology
At present in petroleum drilling operation, especially in horizontal well and directional well drilling operation, widely used measurement while drilling
System (MWD) carries out well track detection, and then instructs drilling process.At some bad grounds structure, oil sheet or hole condition ring
During the complexity of border, in order to position oil reservoir position accurately, reduce the targets such as development risk, it is often necessary to use some to have detection ground
The Geology instrument of layer attribute or the instrument of detection underground working, refer to these special instrument above-mentioned with boring logging system (LWD)
Device combines a set of perfect drilling well evaluation system that mwd system is constituted, and LWD system can be regarded as the extension of mwd system, upgrading
Product.
At present the most in the world and the domestic mwd system having a lot of successful Application and LWD system, each the most not phase of their framework
With, between instrument, the number of adapter is widely different, and the single having cable core number few connects, and also has the company of 20 the most complicated multicores
Connect device.Adapter cable core number is few, then be easy to do is relatively reliable, and instrument attended operation is the easiest, convenient, but one
It is more powerful, flexible that the function that in the case of as, system realizes also is difficult to do, and the little system of cable core number is substantially MWD system
System, and the most do not possess the ability being extended to LWD system；Mwd system that adapter cable core number is many or LWD system, system is very
Easily framework obtains the most powerful, flexible, but the mechanical strength of adapter is the highest, the life-span is the longest, and attended operation is typically also required to
SC is careful.
Summary of the invention
In place of overcoming above-mentioned the deficiencies in the prior art, the present invention provides a kind of based on coaxially connected the surveying with brill of three cores
Amount downhole system, it is few that this system connects cable core number, and reliability is high, and this system can mount LWD instrument very easily simultaneously.
For achieving the above object, the present invention adopts the following technical scheme that a kind of measurement while drilling coaxially connected based on three cores
Downhole system, including three buses, male and female connector, pulser, power supply, electronics inserting tube, gamma inserting tube and end nose, three total
Line is respectively power line (VPWR), ground wire (GND), instrument serial communication bus (TSB), pulser, power supply, electronics inserting tube, gal
Horse inserting tube and end nose are sequentially connected with, and electrical equipment adjacent in power supply, electronics inserting tube, gamma inserting tube and end nose passes through male and female connector
Being electrically connected, male and female connector is the cylindrical element of multi-step, and Male connector is with two sections of cylinders protruded and intermediate recess
Circular groove, female connector is with the cylinder of two concave ends and the middle cylinder protruded, on female connector in the cylinder of two concave ends
Wall is provided with arc convex, is respectively equipped with the junction point being connected with three buses, the instrument of electronics inserting tube upper end in male and female connector
Device shell is unified is used as ground wire.
In technique scheme, described power supply is main battery and reserve battery, and pulser connects driving pipe nipple, described
Drive pipe nipple to be connected with reserve battery, be connected between reserve battery with main battery and have battery to switch pipe nipple.
In technique scheme, when described power supply is monocell, pulser is connected to drive pipe nipple, and described driving short circuit is even
Being connected to battery switching pipe nipple, this battery switching pipe nipple is connected with battery.
In technique scheme, described battery switching pipe nipple includes switching MCU(micro-control unit), switching MCU connects
Having dual pathways DAC, current detecting 1 and actuator, dual pathways DAC connects transport and placing device and comparator, transport and placing device and comparator
Being connected to actuator, transport and placing device connects has voltage detection unit, voltage detection unit to be connected with the circuit of firmly electric current, performs machine
Structure is connected with conducting controller, and conducting controller is connected to stand-by power supply, current detecting 1 and conducting controller connection has electric current to examine
Surveying 2, current detecting 2 is connected to switch MCU.
In technique scheme, when described power supply is self-power generation type pulser and battery, this self-power generation type pulser is even
Being connected to change pipe nipple, this conversion pipe nipple is connected with battery.
In technique scheme, described power supply is self-power generation type pulser, and this self-power generation type pulser connects conversion
Pipe nipple, conversion pipe nipple is connected with empty battery sleeve.
In technique scheme, described conversion pipe nipple includes changing MCU, and conversion MCU connects communication interface, FLASH
Memorizer, real-time clock, galvanic cell detector, dynamo current detector, single phase frequency detector and three-phase electricity commutator,
Battery current detector is connected with battery, and dynamo current detector is connected with three-phase electricity commutator, single phase frequency detector with
Electromotor connects, and battery current detector and dynamo current detector are in parallel.
In technique scheme, electronics inserting tube lower end can mount extension in any order less than 12 Geology instrument
Device, in drill collar, thin bar instrument can directly be connected to below electronics inserting tube by three core coaxial switches, and drill collar formula instrument can pass through
Special transducer is connected to the bottom of instrument string.
The invention has the beneficial effects as follows: will connect together with each only with three buses and male and female connector, cable core number
Few, reliability is high, is screwed by screw thread between male and female connector, easy to connect, is substantially reduced on-the-spot mounting LWD geology
The difficulty of quasi-instrument；Support various ways is powered, and can select power supply mode according to site operation situation；There is the strongest extension
Ability, can mount LWD Geology instrument easily thus constitute LWD system.
Accompanying drawing explanation
Fig. 1 is the sectional view of the male plug fitting of the present invention.
Fig. 2 is the sectional view of female connector of the present invention.
Fig. 3 is the sectional view after male and female connector connects.
Fig. 4 is that in the present invention, power supply is structural representation during Double-battery powered.
Fig. 5 is that in the present invention, power supply is monocell structural representation when powering.
Fig. 6 is the structural representation of battery switching pipe nipple in Fig. 4 and Fig. 5.
Fig. 7 is that in the present invention, power supply is structural representation when self-power generation type pulser and battery.
In Fig. 8 present invention, power supply is structural representation during self-power generation type pulser.
Fig. 9 is the structural representation changing pipe nipple in Fig. 7 and Fig. 8.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment the invention will be further described.
A kind of coaxially connected based on three cores measurement while drilling downhole system as shown in Fig. 1 to Fig. 8, is characterized in that: include
Three buses, male and female connector, pulser, power supply, electronics inserting tube, gamma inserting tube and end nose, three buses are respectively power line
(VPWR), ground wire (GND), instrument serial communication bus (TSB), pulser, power supply, electronics inserting tube, gamma inserting tube and end nose depend on
Secondary connection, electrical equipment adjacent in power supply, electronics inserting tube, gamma inserting tube and end nose is electrically connected by male and female connector,
Male and female connector is the cylindrical element of multi-step, and Male connector is with two sections of cylinders protruded and umbilicate circular groove, and mother patches
Part is with the cylinder of two concave ends and the middle cylinder protruded, and on female connector, to be provided with arc convex for the cylindrical inner wall of two concave ends
Rising, be respectively equipped with the junction point being connected with three buses in male and female connector, the tool housing of electronics inserting tube upper end is unified to be used as
Ground wire.So that described system architecture supports the extension of LWD instrument, downhole instrument string uses and hangs mounting means, and handle
Pulser designs on the top of system architecture, realizes appending disk in pulser periphery, and the LWD instrument of extension is the most permissible so in the future
Be articulated in the lower end of instrument string, and this just Practical Project construction time desired mounting form detection layer attribute instrument
Device is closer to drill bit, and measurement data much sooner, accurately (affected less) by mud contamination！
As shown in Figure 4, described power supply is main battery and reserve battery, and pulser connects a driving pipe nipple, described driving pipe nipple with
Reserve battery connects, and is connected and has battery to switch pipe nipple between reserve battery with main battery.
During as it is shown in figure 5, described power supply is monocell, pulser is connected to drive pipe nipple, and described driving short circuit connects electricity
Pond switching pipe nipple, this battery switching pipe nipple is connected with battery.
As shown in Figure 6, described battery switching pipe nipple includes switching MCU(micro-control unit), switching MCU connects bilateral
Road DAC, current detecting 1 and actuator, dual pathways DAC connects has transport and placing device and comparator, transport and placing device and comparator to be connected to
Actuator, transport and placing device connect have voltage detection unit, voltage detection unit to be connected with the circuit of firmly electric current, actuator with lead
Ventilating controller connects, and conducting controller is connected to stand-by power supply, current detecting 1 and conducting controller connection current detecting 2, electricity
Stream detection 2 is connected to switch MCU.
Switching MCU timing acquiring load total current, draw ought average current value for the previous period, then according still further to specific
Coefficient (20%) calculates minimum current threshold value I that main power source can workmin；MCU sets 2 tunnels of dual pathways DAC by SPI interface
Output voltage, wherein low voltage threshold VminIt is changeless, and low current threshold value IminIt is continuous by computational load electric current
Update；Main battery voltage is close to low pressure threshold VminTime, amplifier output voltage starts to reduce, actuating mechanism controls conduction mechanism,
Allowing reserve battery part power, feedback control makes amplifier output keep high-tension state.
So main battery and reserve battery is powered simultaneously, and all with close to low voltage threshold VminVoltage come to load supply
Electricity.Now the power supplying efficiency ratio of reserve battery is relatively low.
Actuator simultaneously can produce interrupt output, and power supply got involved by notice MCU reserve battery, and MCU can record now
The supply current of main battery, it is that main battery is individually powered the maximum critical current MI that can providemax。
When main battery exhausts soon, it cannot provide a lot of electric current, if the electric current that it provides is less than low current threshold
Value Imin, then comparator overturns, and notice actuator fully opens reserve battery and powers！Now reserve battery need not blood pressure lowering again
Powering at low voltage threshold, but all turn on power supply, its power supplying efficiency is higher.
If hereafter load current does not reduces, then main battery will no longer be powered, because if main battery to be allowed supplies
Electricity, must reduce the power supplying efficiency of reserve battery.If load total current reduces, MCU detects load by the ADC carried
Total current, if MCU finds main battery critical current MImax>=load total current * 50%, then MCU is by low current threshold value IminIf
Fixed to zero, reactivate main battery and power.
During double cell switching power supply: two battery short section BATT1 and BATT2 " head to head " install, the middle battery that connects is cut
Changing pipe nipple, having 2 cores in 3 cores was logical line XCL and VPWR, wherein VPWR be battery switching pipe nipple by judge BATT1+ with
BATT2+ voltage condition and a power supply signal producing, if BATT1 can be independently-powered, then VPWR uses BATT1 to supply
Electricity, otherwise powers together with BATT1 with BATT2, is achieved in that the electricity consuming main battery BATT1 as far as possible；3 cores also have one
Core is used for connecting the positive and negative electrode of battery.Owing to using " head to head " to install, anode all accesses switching pipe nipple, and negative pole
It is simultaneously connected on 3 core coaxial switches in instrument internal and on tool housing, the most both ensure that battery cathode was connected to GND
On network, also pipe nipple is driven to be connected on GND network lower end electronics inserting tube and upper end so that the current supply circuit of whole system is complete
Whole.
Drive the connection of pipe nipple upper end is pulser, and the principle realized due to different pulsers is different, therefore mechanical interface
It is also impossible to identical, so the most not using the 3 coaxially connected modes of core.Our system can mount two kinds of pulsers, a kind of
Being common pulser, it uses single interface (shell does GND loop)；Also having one is self-power generation type pulser, in brief
Being exactly electromotor+pulser, it uses 7 core air plug interfaces (comprising 33 cross streams electricity, 2 pulsers drive line).For connecing
Mouth is different, by driving pipe nipple or conversion pipe nipple that tool interface system is unified into the 3 coaxially connected modes of core, the most just can be articulated to
In this system.
One battery short section typically can use 150 ~ 200 hours, and during site operation, one drill bit typically can work
70 ~ 80 hours, drilling team's construction only can consider make a trip (the most more bit change) from engineering, without considering instrument aspect.Institute
Often there will be such a problem, if battery is only left 30 ~ 40 hours capacity, then this battery in most cases
Having no idea use, this utilization rate having resulted in battery is the lowest, indirect increments instrument use cost.Employing double cell is cut
The mode of changing works and just completely avoid this situation, and the existence of reserve battery can ensure that main battery is completely depleted, will not be to executing
Work has any impact！
When monocell is powered: under double cell switching power supply mode, directly set of cells BATT2 removed, then system has just become list
Battery power supply mode.
The most so can be operated, after being because removing BATT2, the GND signal of the driving pipe nipple of upper end is just
Can receive on BATT2+ network original in battery switching pipe nipple, battery switching circuit detects that BATT2+ signal voltage is the lowest,
Cannot power, will power only with BATT1, even if BATT1 electricity shortage also will not switch！
If main battery BATT1 is new battery, fully meet site operation requirement, then there is no need to connect again reserve battery
BATT2, such instrument string is comparatively short, it is simple to constructing operation；And reserve battery without in severe working environment (high temperature,
Strong vibration) sustain damage！
During as it is shown in fig. 7, described power supply is self-power generation type pulser and battery, this self-power generation type pulser connects has conversion short
Joint, this conversion pipe nipple is connected with battery.
As shown in Figure 8, described power supply is self-power generation type pulser, and this self-power generation type pulser connects conversion pipe nipple, turns
Change pipe nipple to be connected with empty battery sleeve.
As it is shown in figure 9, described conversion pipe nipple include change MCU, conversion MCU connect have communication interface, FLASH memory,
Real-time clock, galvanic cell detector, dynamo current detector, single phase frequency detector and three-phase electricity commutator, battery electricity
Current sensor is connected with battery, and dynamo current detector is connected with three-phase electricity commutator, single phase frequency detector and electromotor
Connecting, battery current detector and dynamo current detector are in parallel.
Electromotor 3 cross streams electric rectification, filtering；
Electromotor, battery use diodes in parallel to export VPWR, and during generator operation, voltage is higher, it power to the load,
When electromotor quits work, battery power to the load；Conversion MCU by carry ADC gather battery current, dynamo current,
Generator voltage；The frequency of conversion MCU detection single-phase electricity, and calculate the rotating speed of electromotor；Conversion MCU obtains real-time clock
The temporal information of (with standby baby battery), then stores information such as electric current, voltage, rotating speed, times in FLASH；Instrument from
After down-hole is taken out, the information of storage in instrument FLASH can be read by special test equipment；Can by special test software
During to analyze underground work, the electricity of battery consumption, generator operation state, electromotor and battery switch operating are the most normal etc.
Function.
When electromotor and battery hybrid power supply: this working method is to improve to form, wherein on the basis of monocell is powered
The pulser on top is replaced with self-power generation type pulser, and then the conversion pipe nipple of lower end is integrated with driving pipe nipple simultaneously and battery is cut
Change the function of pipe nipple, then the connected mode of lower end is completely the same with the connected mode of monocell.
The merit such as power supply switching between rectification, filtering, electromotor and the battery of 3 cross streams electricity is achieved inside conversion pipe nipple
Energy.
Needing preferable work condition environment during generator operation, otherwise its out-put supply is not sufficiently stable, thereby increases and it is possible to can be out of order,
Use hybrid power supply just can stop this kind of phenomenon, greatly reduce instrument failure risk.Simultaneity factor supports that static state is surveyed
Amount, improves certainty of measurement.
When electromotor is individually powered: this working method is to remove battery short section on the basis of hybrid power supply, but use
One empty battery short section (inside not packed battery core body), do so ensures that connected mode is just the same with hybrid mode,
Only difference is that anode BATT1+ is unsettled, do not have voltage, in conversion pipe nipple, power supply switch circuit can only select to send out
Motor output is used as system power supply！
In the case of construction operating mode is very good, it is suitable for this kind of working method, it saves the consuming cost of battery！
If electronics inserting tube lower end does not mount other LWD instrument in system, then whole system constitutes a most basic MWD system
System.If needing to be extended to LWD system, it is only necessary to mount various types of LWD instruments in electronics inserting tube lower end, it is achieved rise
Come the most flexible.The LWD instrument of lower end mounting must possess mechanical interface on all four with electronics inserting tube, electric interfaces, lead to
Letter interface, 3 buses (VPWR, GND, TSB) are penetrated into lower end from upper end, can realize many in this way by each instrument
The mounting of individual LWD Geology instrument.
In technique scheme, electronics inserting tube lower end can be mounted by screw thread and male and female connector in any order
Extension is less than 12 Geology instruments, and in drill collar, thin bar instrument directly can be connected to electronics inserting tube by three core coaxial switches
Below, drill collar formula instrument can be connected to the bottom of instrument string by special transducer.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.
Claims (8)
1. based on the measurement while drilling downhole system that three cores are coaxially connected, it is characterized in that: include that three buses, male and females patch
Part, pulser, power supply, electronics inserting tube, gamma inserting tube and end nose, three buses be respectively power line (VPWR), ground wire (GND),
Instrument serial communication bus (TSB), pulser, power supply, electronics inserting tube, gamma inserting tube and end nose be sequentially connected with, and power supply, electronics are visited
In pipe, gamma inserting tube and end nose, adjacent electrical equipment is electrically connected by male and female connector, and male and female connector is multi-step
Cylindrical element, Male connector is with two sections of cylinders protruded and umbilicate circular groove, and female connector is with the circle of two concave ends
Post and the cylinder of protrusion, on female connector, the cylindrical inner wall of two concave ends is provided with arc convex, sets respectively in male and female connector
Having the junction point being connected with three buses, the tool housing of electronics inserting tube upper end is unified is used as ground wire.
The measurement while drilling downhole system coaxially connected based on three cores the most according to claim 1, is characterized in that: described power supply
For main battery and reserve battery, pulser connects has driving pipe nipple, described driving pipe nipple to be connected with reserve battery, reserve battery and
Connect between main battery and have battery to switch pipe nipple.
The measurement while drilling downhole system coaxially connected based on three cores the most according to claim 1, is characterized in that: described power supply
During for monocell, pulser be connected to drive pipe nipple, described driving short circuit connect have battery switch pipe nipple, this battery switching pipe nipple with
Battery connects.
4., according to the measurement while drilling downhole system coaxially connected based on three cores described described in Claims 2 or 3, it is characterized in that:
Described battery switching pipe nipple includes switching MCU(micro-control unit), switching MCU connects to be had dual pathways DAC, current detecting 1 and holds
Row mechanism, dual pathways DAC connects has transport and placing device and comparator, transport and placing device and comparator to be connected to actuator, and transport and placing device connects
Having voltage detection unit, voltage detection unit to be connected with the circuit of firmly electric current, actuator is connected with conducting controller, conducting control
Device processed is connected to stand-by power supply, current detecting 1 and conducting controller connection has current detecting 2, current detecting 2 to be connected to switching
MCU。
The measurement while drilling downhole system coaxially connected based on three cores the most according to claim 1, is characterized in that: described power supply
During for self-power generation type pulser and battery, this self-power generation type pulser connects conversion pipe nipple, and this conversion pipe nipple is connected with battery.
The measurement while drilling downhole system coaxially connected based on three cores the most according to claim 1, is characterized in that: described power supply
For self-power generation type pulser, this self-power generation type pulser connects conversion pipe nipple, and conversion pipe nipple is connected with empty battery sleeve.
7., according to the measurement while drilling downhole system coaxially connected based on three cores described in claim 5 or 6, it is characterized in that: described
Conversion pipe nipple includes changing MCU, and conversion MCU connects has communication interface, FLASH memory, real-time clock, galvanic cell to detect
Device, dynamo current detector, single phase frequency detector and three-phase electricity commutator, battery current detector is connected with battery, sends out
Motor current sense is connected with three-phase electricity commutator, and single phase frequency detector is connected with electromotor, battery current detector and
Dynamo current detector is in parallel.
8. according to the measurement while drilling downhole system coaxially connected based on three cores described in claim 1 to 7 any bar, its feature
It is: electronics inserting tube lower end can mount extension in any order and be less than 12 Geology instruments, and in drill collar, thin bar instrument can be straight
Connecting three core coaxial switches and be connected to below electronics inserting tube, drill collar formula instrument can be connected to instrument by special transducer
The bottom of string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610764782.5A CN106121638A (en) | 2016-08-30 | 2016-08-30 | A kind of measurement while drilling downhole system coaxially connected based on three cores |
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| CN201610764782.5A CN106121638A (en) | 2016-08-30 | 2016-08-30 | A kind of measurement while drilling downhole system coaxially connected based on three cores |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837201A (en) * | 2017-03-22 | 2017-06-13 | 中国石油天然气集团公司 | A kind of split type drill collar and logging method |
| CN106884619A (en) * | 2017-03-22 | 2017-06-23 | 中国石油天然气集团公司 | A kind of anti-wear measurement while drilling drill collar and measuring method |
| CN107143326A (en) * | 2017-06-14 | 2017-09-08 | 北京中地英捷物探仪器研究所有限公司 | A kind of multi-functional well logging apparatus |
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| CN107143326A (en) * | 2017-06-14 | 2017-09-08 | 北京中地英捷物探仪器研究所有限公司 | A kind of multi-functional well logging apparatus |
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Application publication date: 20161116 |