CN108756862A - With brill Double wire transmission bus system - Google Patents
With brill Double wire transmission bus system Download PDFInfo
- Publication number
- CN108756862A CN108756862A CN201810521983.1A CN201810521983A CN108756862A CN 108756862 A CN108756862 A CN 108756862A CN 201810521983 A CN201810521983 A CN 201810521983A CN 108756862 A CN108756862 A CN 108756862A
- Authority
- CN
- China
- Prior art keywords
- double
- wire transmission
- instrument
- double wire
- bus system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
Abstract
It is specific open a kind of with brill Double wire transmission bus system the present invention relates to downhole instrument technical field, including：Several instruments and Double wire transmission system, several instruments are all connected to the Double wire transmission system, and the interface section of the instrument is connect by double wired conductor or single-core line with the Double wire transmission system.The present invention is a kind of reduction or the influence that shields external environment to bus system, considerably increases system signal noise ratio, to ensure bus system reliability with boring Double wire transmission bus system.
Description
Technical field
The present invention relates to downhole instrument technical fields, more particularly to a kind of to reduce or shield external environment to bus system
Influence, considerably increase system signal noise ratio, to ensure bus system reliability with bore the total linear system of Double wire transmission
System.
Background technology
Logger is placed near drill bit, Jiu while creeping into obtain stratum various data, here it is with bore survey
Well.Especially horizontal well drilling adjusts bit course using the drilling parameter and formation parameter that measure, is allowed to along target zone in time
It creeps into direction.Due to well logging obtain formation parameter be just to bore the formation parameter opened, it closest to stratum reset condition,
It is more more valuable than general wireline logging.Connector for logging while drilling is surveyed except measured resistivity, the velocity of sound, neutron porosity, density etc. are conventional
Outside well and certain imaging loggings, bit pressure, torque, rotating speed, annular pressure, temperature, the drilling parameters such as chemical composition are also measured.
While drilling system is collectively formed by ground data acquisition processing system and downhole instrument, and underground bus system is surveyed with brill
The core component of well system is mainly responsible for monitoring management downhole toolbus communications, completes real-time data acquisition and number
According to storage, controlling bus voltage/current, management downhole instrument clock etc..Underground bus system is as shown in Figure 1.
Bus system includes upper bus and lower bus, instrument A, instrument B, and instrument C represents various connector for logging while drilling, MWD
Measurement while-drilling instrument, for measuring azimuth information and various drilling parameters, then by well Transmission system in bus
The formation parameter information of acquisition is transmitted to ground.
Bad environments in drill bit drilling process, temperature is very high, and pressure is very big, and vibration is strong.By subsurface environment and ground
The limitation of face instrument assembling utilizes instrument currently, downhole toolbus nearly all uses single serial bus structure both at home and abroad
Shell as bus system, bus signal transmission and bus is realized at instrument connecting interface simultaneously by a single condctor
Two functions of power supply, as shown in Figure 2.
While drilling system underground single mode bus is influenced very big, extraneous interference by drilling environment and is directly coupled to bus
On so that the Signal-to-Noise in bus is low, and the bit error rate is high, and system stability declines.And the distributed constant of bus reduces
Bus transfer rate.For the larger Image-forming instrument of some data volumes, since a bag data is larger, lower signal-to-noise ratio makes
Complete package data must abandon simultaneously and can not normal use, cause prodigious influence to system.
Invention content
The present invention is directed to overcome the deficiencies of existing technologies, provide it is a kind of reduction or shield external environment to bus system
Influence, considerably increase system signal noise ratio, to ensure bus system reliability with bore Double wire transmission bus system.
To achieve the above object, the present invention uses following technical scheme：It provides a kind of with brill Double wire transmission bus system, packet
It includes：Several instruments and Double wire transmission system, several instruments are all connected to the Double wire transmission system, the interface of the instrument
Part is connect by double wired conductor or single-core line with the Double wire transmission system.
When the interface section of the instrument is connect by double wired conductor with the Double wire transmission system, the double wired conductor is double
Core coaxial configuration or twin-core double-twisted structure.
The twin-concentric structure or twin-core double-twisted structure are used as shielded layer by the shell of the instrument.
When the interface section of the instrument is connect by single-core line with the Double wire transmission system, the inside of the instrument
Using single double-twisted structure.
In interface, power supply and the ground of the instrument on adjacent both sides are connected to the single-core line by common mode inductance respectively
With shell.
The beneficial effects of the present invention are：Tool housing is regarded into shielded layer, since the natural screening of tool housing acts on,
It ensures that the signal in bus is almost free from the influence of the external environment, to substantially improve the signal-to-noise ratio of bus, reduces
The bit error rate.
Description of the drawings
Fig. 1 show the schematic diagram of bus system under conventional well.
Fig. 2 is shown with brill single bus structures schematic diagram.
Fig. 3 show twin-concentric schematic diagram.
Fig. 4 show twin-core double-twisted structure schematic diagram.
Fig. 5 single twisted pair construction schematic diagrames.
Fig. 6 is the schematic diagram of the interface of Fig. 5.
Fig. 7 show single bus termination signal voltage schematic diagram.
Fig. 8 show dual-wire bus transmission terminal signal.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with attached drawing and specific implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only explaining this hair
It is bright, but not to limit the present invention.
In order to reduce influence of the external environment to bus, the present invention is proposed with brill Double wire transmission bus system.It realizes
With brill Double wire transmission bus system, therefore, to assure that instrument internal has both threads throughout.It is divided into two kinds of situations, the first situation
Being tool interface system part realizes double wired conductor connection；The second situation is that tool interface system part can be only done single-core line connection.When
When tool interface system part realizes double wired conductor connection, then twin-concentric structure as shown in Figure 3 can be introduced, or as schemed
Twin-core double-twisted structure shown in 4.
As shown in Figure 3 and Figure 4, twin-concentric structure and twin-core double-twisted structure all assign tool housing as shielded layer, due to
The natural screening of tool housing acts on, and ensures that the signal in bus is almost free from the influence of the external environment, to significantly
The signal-to-noise ratio of bus is improved, the bit error rate is reduced.
As shown in figure 5, when the interface section of the instrument is connect by single-core line with the Double wire transmission system, also need
The structure of twisted-pair feeder is used in instrument internal, the place of interface is the electricity as shown in fig. 6, the instrument on adjacent both sides
Source is connected to the single-core line and shell by common mode inductance respectively with ground.
It should be noted that due to the present invention with bore Double wire transmission bus system in, including：Several instruments and Double wire transmission
System, as shown in Figure 2-5, in order to better discriminate between, several instruments are indicated by instrument A, instrument B, instrument C, instrument D, instrument
The shell of device is as bus system.
For under double wired conductor condition of contact, i.e., under conditions of twin-concentric structure and twin-core double-twisted structure, shielding action is
It will be apparent that when the interface section of the instrument is connect by single-core line with the Double wire transmission system, the instrument
Inside uses single double-twisted structure.Single double-twisted structure is analyzed below, illustrates its traditional single core list such as shown in Fig. 2
The preferred reason of cable architecture.The common mode inductance of single double-twisted structure has certain buffer action to shell, meanwhile, for useful
Signal does not have hindrance function, and signal can unhinderedly pass through, and external disturbance is blocked；Twisted-pair feeder greatly reduces bus
Distributed inductance, to considerably increase the ability of bus transfer rate.
As shown in Figure 7, it is assumed that amplitude that there are one external environment tools is the white noise signal of 0.6V, and transmitting signal in bus is
Amplitude is ± 1V, the square-wave signal of 100kHz, then as shown in Figure 7 in the signal that receiving terminal obtains.
As it can be seen that the signal that terminal receives has larger noise, signal-to-noise ratio is undesirable, needs through Schmitt comparator
Etc. signal processing circuits be likely to obtain comparatively ideal signal and restore.Since bus system anti-interference ability is limited, the bit error rate
It is larger.
As shown in figure 8, introducing dual-wire bus transmission, that is, twisted-pair feeder is being used throughout with brill instrument internal,
Due to being electrically connected using common mode inductance in interface, the signal in bus can be passed through, outside noise is done
It disturbs, can significantly be inhibited.Assuming that common mode inductance is 0.1mH, then under conditions of other parameters are constant, terminal letter
Number as shown in Figure 8.
As can be seen that significantly being improved using the terminal signaling signal-to-noise ratio of dual-wire bus transmission.Due to twisted-pair feeder
Effect, the electric current that bus flows through shell significantly reduce, and substantially reduce influence of the bus current to connector for logging while drilling.
The specific implementation mode of present invention described above, is not intended to limit the scope of the present invention..Any basis
Various other corresponding changes made by the technical concept of the present invention and deformation, should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (5)
1. a kind of with brill Double wire transmission bus system, which is characterized in that including：Several instruments and Double wire transmission system, Ruo Gansuo
It states instrument and is all connected to the Double wire transmission system, the interface section of the instrument passes through double wired conductor or single-core line and described pair
Line Transmission system connects.
2. as described in claim 1 with brill Double wire transmission bus system, which is characterized in that when the interface section of the instrument is logical
When crossing double wired conductor and being connect with the Double wire transmission system, the double wired conductor is twin-concentric structure or twin-core double-twisted structure.
3. as claimed in claim 2 with brill Double wire transmission bus system, which is characterized in that the twin-concentric structure or twin-core
Double-twisted structure is used as shielded layer by the shell of the instrument.
4. as described in claim 1 with brill Double wire transmission bus system, which is characterized in that when the interface section of the instrument is logical
When crossing single-core line and being connect with the Double wire transmission system, the inside of the instrument uses single double-twisted structure.
5. as claimed in claim 4 with brill Double wire transmission bus system, which is characterized in that in interface, the institute on adjacent both sides
The power supply and ground for stating instrument are connected to the single-core line and shell by common mode inductance respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521983.1A CN108756862A (en) | 2018-05-28 | 2018-05-28 | With brill Double wire transmission bus system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521983.1A CN108756862A (en) | 2018-05-28 | 2018-05-28 | With brill Double wire transmission bus system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108756862A true CN108756862A (en) | 2018-11-06 |
Family
ID=64006205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810521983.1A Pending CN108756862A (en) | 2018-05-28 | 2018-05-28 | With brill Double wire transmission bus system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108756862A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4320472A (en) * | 1974-11-05 | 1982-03-16 | United Geophysical Corporation | Digital geophone system |
| US20050219063A1 (en) * | 2000-03-30 | 2005-10-06 | Baker Hughes Incorporated | Bandwidth wireline data transmission system and method |
| CN202549487U (en) * | 2012-04-12 | 2012-11-21 | 湖州久鼎电子有限公司 | Double-core coaxial cable |
| CN102839972A (en) * | 2011-06-21 | 2012-12-26 | 中国石油集团长城钻探工程有限公司 | Bus system of logging downhole instrument based on twisted-pair Ethernet and logging method |
| CN203149133U (en) * | 2013-04-08 | 2013-08-21 | 山西晋明海科技开发有限公司 | Mining common cable device for synchronous triggering and data communication for seismic system |
| CN106121629A (en) * | 2016-06-22 | 2016-11-16 | 中国石油集团渤海钻探工程有限公司 | The sensor internal cabling demagnetization method of wireless drilling inclinometers |
| CN107251166A (en) * | 2015-02-20 | 2017-10-13 | 株式会社润工社 | Twin-core balanced cable |
| CN107288624A (en) * | 2017-07-28 | 2017-10-24 | 电子科技大学 | A kind of underground high speed data bus device suitable for acoustic logging instrument |
-
2018
- 2018-05-28 CN CN201810521983.1A patent/CN108756862A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4320472A (en) * | 1974-11-05 | 1982-03-16 | United Geophysical Corporation | Digital geophone system |
| US20050219063A1 (en) * | 2000-03-30 | 2005-10-06 | Baker Hughes Incorporated | Bandwidth wireline data transmission system and method |
| CN102839972A (en) * | 2011-06-21 | 2012-12-26 | 中国石油集团长城钻探工程有限公司 | Bus system of logging downhole instrument based on twisted-pair Ethernet and logging method |
| CN202549487U (en) * | 2012-04-12 | 2012-11-21 | 湖州久鼎电子有限公司 | Double-core coaxial cable |
| CN203149133U (en) * | 2013-04-08 | 2013-08-21 | 山西晋明海科技开发有限公司 | Mining common cable device for synchronous triggering and data communication for seismic system |
| CN107251166A (en) * | 2015-02-20 | 2017-10-13 | 株式会社润工社 | Twin-core balanced cable |
| CN106121629A (en) * | 2016-06-22 | 2016-11-16 | 中国石油集团渤海钻探工程有限公司 | The sensor internal cabling demagnetization method of wireless drilling inclinometers |
| CN107288624A (en) * | 2017-07-28 | 2017-10-24 | 电子科技大学 | A kind of underground high speed data bus device suitable for acoustic logging instrument |
Non-Patent Citations (5)
| Title |
|---|
| 刘红丽等: "《传感与检测技术》", 30 September 2012, 国防工业出版社 * |
| 周旭: "《电子设备抗干扰原理与技术》", 31 January 2005, 国防工业出版社 * |
| 盖立斌: "CAN总线在Wiseye1000测井平台中的应用", 《石油工业计算机应用》 * |
| 陈一才: "《大楼自动化***设计手册》", 31 October 1994, 中国建筑工业出版社 * |
| 黄龙: "基于冗余技术的CAN总线可靠性研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
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Application publication date: 20181106 |
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| RJ01 | Rejection of invention patent application after publication |