CN104727810B - With bore TT＆C system downgoing communication device and its under pass the means of communication - Google Patents
With bore TT＆C system downgoing communication device and its under pass the means of communication Download PDFInfo
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- CN104727810B CN104727810B CN201310717950.1A CN201310717950A CN104727810B CN 104727810 B CN104727810 B CN 104727810B CN 201310717950 A CN201310717950 A CN 201310717950A CN 104727810 B CN104727810 B CN 104727810B
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- 230000006854 communication Effects 0.000 title claims abstract description 87
- 238000004891 communication Methods 0.000 title claims abstract description 86
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 17
- 230000008520 organization Effects 0.000 claims description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 2
- 230000008450 motivation Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 6
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 210000002445 nipple Anatomy 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 208000013407 communication difficulty Diseases 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000003462 vein Anatomy 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
- 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
- E21B47/14—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 using acoustic waves
- E21B47/18—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
- E21B47/22—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by negative mud pulses using a pressure relieve valve between drill pipe and annulus
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Acoustics & Sound (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses it is a kind of with bore TT＆C system downgoing communication device and its under pass the means of communication, the downgoing communication device includes ground control system (13), biography communication means down (14) in slurry transportation manifold (4) of the slush pump (5) with pressure buffer gear or hydraulic energy-accumulating mechanism between drilling rod and the signal being installed in the BHA that underground is connected with drilling rod are received and DPA data processing activity, ground control system (13) is electrically connected with biography communication means (14) down, lower biography communication means (14) is received with signal and is connected by slurry transportation manifold (4) with DPA data processing activity.The device can not change previous cycle system discharge capacity and set up on the premise of not interrupting normal drilling operation or realize downgoing communication.
Description
Technical field
The present invention relates in a kind of drilling engineering field to underground down-transmitting data or instruction with boring the descending of TT＆C system
Communication device and its under pass the means of communication.
Background technology
In drilling process, driven by rotating disk, top or power drilling tool drives bit, drilled stratum and realize drilling well purpose.
In the drilling process such as horizontal well, directional well, complex structural well, the instrument such as measurement while drilling, well logging is widely used,
Rotary steering, the application of vertical drilling tool are also in increasing progressively.In addition to gas drilling, conventional drilling uses mud by drilling cuttings
Ground, DHM-MWD, the instrument such as well logging and rotary steering, using mud-pressure pulses as letter are transported to from shaft bottom
Number upload medium.With the raising of drilling complexity degree, the communication need between ground and underground progressively attracts attention and weight
Depending on.
Currently, by the use of mud as medium, data down transmission to the method for downhole intelligent instrument and instrument is had from ground：It is logical
Cross under change and send discharge capacity, change and drive the mode such as pass under rotating speed and pressure pulse.Patent GB2444657A discloses one kind and changes
Become the method that discharge capacity is circulated in underground, the method that the method increases a set of slush pump by ground, control the pump closes down realization row
Downgoing communication is realized in the change of amount, the change of downhole detection discharge capacity.Patent US2005209782A1 discloses a kind of band underground horse
Up to when biography mode down, by the sensor below motor rotor, detection ground controls change in face of motor rotor rotating speed,
Realize downgoing communication.Patent US4763258, US6267185 is disclosed by changing drilling tool rotating speed or corner, downhole sensor inspection
Survey rotating speed or corner change, the method for being decoded by predictive encoding and being controlled to downhole intelligent instrument and instrument.Patent
US2011/0286308A1 disclose one kind on pressure manifold, install discharge device method, by controlled discharge device with
The mode of coding, fixed displacement is pumped into the mud earial drainage of underground in advance, makes underground discharge capacity or flow velocity slave pulses, downhole intelligent
Instrument or instrument carry out detection decoding to this, realize downgoing communication.
Current mud telemetry system downgoing communication method, common mode includes：I mode that () changes discharge capacity has positive pulse
The mode of discharge capacity and slave pulses discharge capacity, additional displacement supply is increased respectively in pressure manifold or increases discharge device.This
Class mode installs valve and control system because needing in geostatic pressure manifold, is increased at circulatory system feed flow end by the unlatching of valve
Add deduct few discharge capacity.Because system pressure is high, safety equipment requirement is high, causes systems bulky, at the same the erosion of valve compared with
For serious, frequently action is easily caused potential safety hazard.(ii) change the mode of ground driving or down-hole motor rotating speed or corner, glue
The presence of sliding and frictional resistance makes have very big difficulty from the rotating speed or corner of ground control bottom drill tool, causes downgoing communication to be difficult to build
It is vertical.
To sum up, the shortcoming of existing downgoing communication system and method is：In pressure manifold increase additional displacement supply or
Increasing discharge device can change the discharge capacity of previous cycle system, and cause complex structure；Change ground to drive or underground horse
Mode up to rotating speed or corner sets up downgoing communication difficulty, it is necessary to set up on the premise of normal drilling operation is interrupted.
The content of the invention
A technical problem to be solved by this invention is to provide a kind of downgoing communication device with brill TT＆C system, its
Previous cycle system discharge capacity can not changed and set up on the premise of not interrupting normal drilling operation or realized downgoing communication.
For the technical problem, technical solution of the invention be to provide it is a kind of with following structure with bore observing and controlling
The downgoing communication device of system, including ground control system, installed in the mud with pressure buffer gear or hydraulic energy-accumulating mechanism
Passing down in the slurry transportation manifold between pump and drilling rod and is installed in the BHA that underground is connected with drilling rod communication means
Signal receive and DPA data processing activity, ground control system with down pass communication means electrically connect, it is lower biography communication means and signal
Reception is connected with DPA data processing activity by slurry transportation manifold.
Compared with prior art, the beneficial effects of the invention are as follows, by ground control system control down pass communication means with
Non- earial drainage mode produces pulse signal, pulse signal to be received and data processing by the signal that slurry transportation manifold passes to underground
Mechanism, so as to realize in the case where being set up on the premise of not changing previous cycle system discharge capacity and not interrupting normal drilling operation or being realized
Row communication.
Improved as one kind of device of the invention, the downgoing communication mechanism includes pressure-bearing pipe, determines valve, dynamic valve and control
Drive mechanism, described to determine valve and fix to be located in pressure-bearing pipe, described to determine valve and be provided with flow channels, the dynamic valve is in drive mechanism
With respect to determining the movable area of passage to change the flow channels for determining valve of valve so as to form flowed fluctuation, the control under effect
Drive mechanism is electrically connected with ground control system.Valve motion is determined relatively by controlling brake valve, is changed area of passage and is formed flow arteries and veins
Punching, flow pulse pass to signal receive with DPA data processing activity after received the decode.Formed by changing area of passage
On slush pump and existing rig substantially without influence, the transmission of traffic pulse does not influence just for the downgoing communication mechanism of flow pulse
The carrying out of normal drillng operation.Lower biography communication means use valve type structure, are only setting up and are performing downgoing communication process to cyclic system
System pressure has smaller influence, in off working state, neither increases pressure consumption nor reduces discharge capacity.
One kind as device of the invention is preferred, and the drive mechanism includes the drive mechanism and use for driving dynamic valve
In the controlling organization of control drive mechanism, the controlling organization is electrically connected with ground control system.Ground control system sends and refers to
Make to controlling organization, controlling organization control drive mechanism drives dynamic valve.Simple structure, easily realizes.
Another kind as device of the invention is preferred, and described dynamic valve passes through multiple pedestals and is connected with pressure-bearing pipe,
It is the communication pedestal for installing communication cable wherein to have a pedestal, and controlling organization is made with ground by the communication cable
Face control system realizes communication.Pedestal plays a part of spacing dynamic valve so that dynamic valve is moved back and forth or turned round in the range of stroke
Motion is so as to change area of passage stroke flow pulse.Communication device includes connection electric wire or connection cable, realizes ground control
Connection or communication between system and controlling organization.
A kind of preferred as also having for device of the invention, the signal is received and received including signal with DPA data processing activity
Unit and data processor, the signal receiving unit are electrically connected with data processor, and the signal receiving unit is passed under receiving
The signal that communication means are transmitted by slurry transportation manifold, and data processor is passed to after being decoded to signal.Signal connects
Receive unit monitoring and receive traffic pulse, and realize the decoding of pulse signal.Data processor is received and process signal connects
The data of unit transmission are received, typically can also also be increased realization and be sent up semiotic function.
It is a kind of preferred as also having for device of the invention, include flow checking part in the signal receiving unit.
Flow checking part can use flow sensor, and the traffic pulse for passing down is detected by flow sensor.
A kind of preferred as also having for device of the invention, the data processor is intelligence tool or instrument.Work as shaft bottom
Intelligence tool or after instrument receives the synchronization pulse of downgoing communication signal, close up-delivering signal, start to be passed under receiving
Data or instruction；Stop receiving down-transmitting data or instruction after downgoing communication signal node beam pulse signal is received, open and upload
Signal.Intelligence tool or instrument can receive the data of signal receiving unit transmission, and can realize and ground control system between
Upload communication.
Another technical problem to be solved by this invention is to provide under one kind can set up or be realized by non-earial drainage mode
The downgoing communication method with brill TT＆C system of row communication.
For the technical problem, technical solution of the invention be to provide it is a kind of using device of the invention with brill
The downgoing communication method of TT＆C system, and comprise the following steps：Pass communication means downwards by ground control system and send instruction,
It is lower biography communication means control brake valve and determine the relative motion between valve so as to change area of passage formation pulse signal pass to letter
Number receive and DPA data processing activity, the signal receive with DPA data processing activity return pulse signal simultaneously pulse signals
Reason.
Compared with the existing method for realizing downgoing communication, the present invention uses non-earial drainage mode, is not changing existing cyclic system
Set up on the premise of system discharge capacity or realize downgoing communication.And it is simple to operate, easily realize.
One kind as the method for the present invention is preferred, and the pulse signal is constituted with by discharge capacity negative pulse, pulse spacing
Coding unit is to be passed under unit forms pulse code sequence.By discharge capacity negative pulse, pulse spacing such a coded system reality
Existing pulse code transmission.
Brief description of the drawings
It is a kind of embodiment of the borer system for including downgoing communication device of the invention shown in Fig. 1.
The structural representation of the downgoing communication mechanism in downgoing communication device in Fig. 1 shown in Fig. 2.
It is the schematic diagram of the traffic pulse of downgoing communication device in Fig. 2 shown in Fig. 3.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
It is as shown in Figure 1 a kind of structural scheme of mechanism for including the rig for passing communication device down of the invention.Conventional drilling mistake
Cheng Zhong, the borer system includes at least one slush pump 5, slurry transportation manifold 4, traveling system 2, cock pipe nipple 3 and drilling rod
7, rig forms well annular space 8 after installing between drilling well.Slush pump 5 generally carries pressure buffer mechanism or hydraulic energy-accumulating mechanism,
In the present embodiment, slush pump 5 plays pressure buffer effect with air bag 6.The drilling fluid that slush pump 5 is pumped out i.e. mud is successively
By slurry transportation manifold 4, traveling system 2, flow through cock pipe nipple 3, the circulatory system that drilling rod 7, drill bit 12 and annular space 8 are formed after
Return out.
In the present embodiment, as shown in figure 1, the downgoing communication device of the borer system, including ground control system 13, peace
The biography down in slurry transportation manifold 4 between slush pump 5 and drilling rod 7 with pressure buffer gear or hydraulic energy-accumulating mechanism is led to
News mechanism 14 and the signal being installed in the BHA that underground is connected with drilling rod 7 are received and DPA data processing activity, ground control
System 13 is electrically connected with biography communication means 14 down, and lower biography communication means 14 are received with signal and DPA data processing activity is defeated by mud
Manifold 4 is sent to connect.Signal is received includes signal receiving unit 10 and intelligence tool or instrument with DPA data processing activity, and signal is received
Unit 10 is installed on the bottom of BHA with intelligence tool or instrument, and connects drill bit 12 in lower section.In signal receiving unit 10
Portion is installed by flow checking part, such as flow sensor.
It is lower to pass any position that communication means 14 are mountable in the slurry transportation manifold 4 between slush pump 5 and cock pipe nipple 3
Put, the communication device that passes down in the present invention does not increase extra circulatory system fluid loss, and formation is a kind of non-drawn
Under pass communication modes.In the course of work, ground control system 13 pairs passes down communication means 14 and is controlled, by predetermined coding,
Control passes down the action of communication means 14, the mud in drilling rod 7 is produced changes in flow rate, and signal receiving unit 10 passes through built-in stream
Amount detection means, detection flows change, and by sending an instruction to intelligence tool or instrument after predetermined coding and decoding.
It is a kind of structure of specific embodiment of downgoing communication mechanism 14 in downgoing communication device of the invention shown in Fig. 2
Schematic diagram.In this embodiment, lower biography communication means 14 include determining valve 16, dynamic valve 17, drive mechanism 18, controlling organization 19 and base
Seat 22, pedestal 22 includes installing the communication pedestal 20 of communication cable 21.Dynamic valve 17 is installed by pedestal 22 and communication pedestal 20
Inside pressure-bearing pipe 15, and valve 16 is determined relatively and is moved by controlling organization 19 and the dynamic valve 17 of the driving of drive mechanism 18.Communication pedestal
20 is the communication interface for passing communication means 14 and ground control system 13 down, will down pass the communication cable 21 of communication means 14 from holding
Drawn in pressure pipe 15 and be connected with ground control system 13.Lower biography communication means 14 are received by slurry transportation manifold 4 with signal
Unit 10 is connected.Determine valve 16 and constitute current limliting valve group with dynamic valve 17, can be linear motion valve, or rotary valve, pass through
The area of passage that change is determined between valve 16 and dynamic valve 17 produces metering function.Drive mechanism 18 can be driven by motor or hydraulic system
Dynamic, control brake valve 17 determines the position of the motion of valve 16 relatively.When controlling organization 19 receives the action that ground control system 13 sends
After instruction, control drive mechanism 18 is acted, and changes the circulation area of dynamic valve 17 and the flow-limiting valve for determining the formation of valve 16, produces throttling to make
With the circulatory system pressure of rig increases, and due to the presence of air bag 6, discharge capacity is reduced in a short time, makes circulatory system flow
Produce slave pulses flowed fluctuation.
As shown in figure 3, during the circulatory system normal work of rig, discharge capacity is basicly stable, when determining valve 17 in drive mechanism 18
Driving under act, relative to determining after valve 16 moves or rotate, the circulation area reduction of flow-limiting valve, on the curve of basic discharge capacity 23
Form discharge capacity and decline 24, then, determine valve 17 and return to initial position, form discharge capacity and recover 25；Due to the presence of air bag 6, go out
Now recover to basic discharge capacity 23 after discharge capacity overshoot 26 in short-term, complete a discharge capacity negative pulse 30.One passes down signal sequence and includes
Multiple discharge capacity negative pulses 30 are constituted, and there is the identical or different pulse spacing 27 between each discharge capacity negative pulse, are constituted such as
The encoded interval of coding unit 28 or coding unit 29, is capable of achieving the coding of data, finally realizes data down transmission.The signal of underground
Receiving unit 10 detects discharge capacity negative pulse by flow sensor, such as coding unit 28 and coding unit 29 is calculated, to signal
Decoded, received down-transmitting data.
Although invention has been described in conjunction with specific embodiments, it being understood, however, that do not departing from the present invention
Scope in the case of, various improvement or replacement can be carried out to it.Especially, as long as in the absence of the conflict in structure, each reality
Applying the feature in example can be combined with each other, and the combined type feature for being formed is still fallen within the scope of the present invention.The present invention is simultaneously
It is not limited to specific embodiment disclosed herein, but all technical schemes including falling within the scope of the appended claims.
Claims (9)
1. it is a kind of with bore TT＆C system downgoing communication device, including ground control system (13), installed in band pressure buffer
Biography communication means (14) down in slurry transportation manifold (4) between the slush pump (5) and drilling rod (7) of structure or hydraulic energy-accumulating mechanism
Received with the signal being installed in the BHA that underground is connected with drilling rod (7) and DPA data processing activity, ground control system
(13) electrically connected with biography communication means (14) down, lower biography communication means (14) is received with DPA data processing activity by mud with signal
Conveying pipeline (4) is connected；
The downgoing communication mechanism includes pressure-bearing pipe (15), determines valve (16), dynamic valve (17) and control drive mechanism, described to determine valve
(16) fixation is located in pressure-bearing pipe (15), and described to determine valve (16) and be provided with flow channels, the dynamic valve (17) is in drive mechanism
With respect to determining the movable area of passage to change the flow channels for determining valve (16) of valve (16) so as to form flowed fluctuation under effect,
The control drive mechanism is electrically connected with ground control system (13).
2. device according to claim 1, it is characterised in that the drive mechanism includes the drive for driving dynamic valve (17)
Motivation structure (18) and the controlling organization (19) for controlling drive mechanism (18), the controlling organization (19) and ground control system
(13) electrically connect.
3. device according to claim 2, it is characterised in that described dynamic valve (17) is by multiple pedestals (22) and pressure-bearing
Pipe (15) connection, wherein have a pedestal (22) to install the communication pedestal (20) of communication cable (21), by the communication electricity
Cable (21) makes controlling organization (19) realize communication with ground control system (13).
4. the device according to any one of claims 1 to 3, it is characterised in that the signal is received and data processor
Structure includes signal receiving unit (10) and data processor (11), the signal receiving unit (10) and data processor (11) electricity
Connection, the signal receiving unit (10) receives and pass down the signal that communication means (14) are transmitted by slurry transportation manifold (4), and
Data processor (11) is passed to after being decoded to signal.
5. device according to claim 4, it is characterised in that includes flow detection in the signal receiving unit (10)
Component.
6. device according to claim 4, it is characterised in that the data processor (11) is intelligence tool or instrument.
7. a kind of with the downgoing communication method for boring TT＆C system, using the device any one of claim 1~6, and wrap
Include following steps：
Ground control system (13) pass downwards communication means (14) send instruction, it is lower biography communication means (14) control brake valve (17) with
Determine the relative motion between valve (16) and pass to signal reception and data processor so as to change area of passage formation pulse signal
Structure, simultaneously pulse signals are processed with DPA data processing activity return pulse signal for the signal reception.
8. method according to claim 7, it is characterised in that the pulse signal is with by discharge capacity negative pulse (30), pulse
The coding unit (28,29) that interval (27) is constituted is passed under forming pulse code sequence for unit.
9. a kind of borer system, including the device any one of claim 1~6.
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| CN201310717950.1A CN104727810B (en) | 2013-12-23 | 2013-12-23 | With bore TT＆C system downgoing communication device and its under pass the means of communication |
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| CN201310717950.1A CN104727810B (en) | 2013-12-23 | 2013-12-23 | With bore TT＆C system downgoing communication device and its under pass the means of communication |
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| CN104727810B true CN104727810B (en) | 2017-07-07 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609668B (en) * | 2015-10-23 | 2019-06-25 | 中国石油化工股份有限公司 | One kind is with brill formation pressure testing system underground instruction decoding method and device |
| CN105525907B (en) * | 2015-12-17 | 2018-10-19 | 中国石油集团长城钻探工程有限公司 | It is programmable to automatically control downgoing communication system and downlink signal transmission |
| CN107100614B (en) * | 2016-02-19 | 2023-10-20 | 中国石油化工集团有限公司 | Negative pressure continuous wave pulse generating device |
| CN107785012B (en) * | 2016-08-26 | 2021-11-30 | 中国石油化工股份有限公司 | Control method of sound control driller display |
| CN106677768A (en) * | 2017-01-16 | 2017-05-17 | 四川宏华石油设备有限公司 | Information downloading device and method based on RPM |
| CN107395449B (en) * | 2017-06-15 | 2021-09-24 | 大连理工大学 | Ground experiment device of rotary steering drilling equipment communication system and use method thereof |
| CN108533256A (en) * | 2018-04-12 | 2018-09-14 | 中石化石油工程技术服务有限公司 | A kind of underground and ground multisensor array acquisition system |
| CN111577261B (en) * | 2020-05-12 | 2020-11-20 | 中国科学院地质与地球物理研究所 | Underground pulse signal generator, pressure pulse transmission method, drill collar and drilling equipment |
| CN111852366B (en) * | 2020-05-29 | 2022-10-18 | 中国石油天然气集团有限公司 | Accurate shunting method for rotary guide system downloading device |
| CN111810113A (en) * | 2020-08-11 | 2020-10-23 | 中国石油天然气集团有限公司 | Rotary steering automatic drilling method based on deep learning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550392A (en) * | 1982-03-08 | 1985-10-29 | Exploration Logging, Inc. | Apparatus for well logging telemetry |
| CN85108732A (en) * | 1985-10-26 | 1987-04-29 | 瑟吉·A·舍巴茨科 | The method and apparatus of communicating between spaced locations in the wellhole |
| DE59509406D1 (en) * | 1995-05-23 | 2001-08-16 | Baker Hughes Inc | Method and device for transmitting information to an underground information recipient |
| GB2349404B (en) * | 1998-02-05 | 2000-12-20 | Baker Hughes Inc | Apparatus for transmitting data during drilling |
| US6920085B2 (en) * | 2001-02-14 | 2005-07-19 | Halliburton Energy Services, Inc. | Downlink telemetry system |
| US8692685B2 (en) * | 2005-09-19 | 2014-04-08 | Schlumberger Technology Corporation | Wellsite communication system and method |
| GB2464263B (en) * | 2008-10-07 | 2011-04-13 | Schlumberger Holdings | Method of downlinking to a downhole tool |
| CN102644458B (en) * | 2012-04-17 | 2014-10-15 | 中国海洋石油总公司 | Instruction downlink encoding and decoding methods based on mud-pressure pulses |
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