CN110500087A - Signal transmission method based on mud pulse pressure amplitude - Google Patents
Signal transmission method based on mud pulse pressure amplitude Download PDFInfo
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- CN110500087A CN110500087A CN201910799484.3A CN201910799484A CN110500087A CN 110500087 A CN110500087 A CN 110500087A CN 201910799484 A CN201910799484 A CN 201910799484A CN 110500087 A CN110500087 A CN 110500087A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008054 signal transmission Effects 0.000 title claims abstract description 4
- 230000035485 pulse pressure Effects 0.000 title abstract 2
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
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- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- 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
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Abstract
The invention discloses a signal transmission method based on mud pulse pressure amplitude, which is characterized by comprising the following steps: setting the pressure amplitude to be in a decimal form of 10 levels, sequentially and uniquely corresponding to numbers in 0-9, representing 0 when the pressure amplitude is lowest, representing 9 when the pressure amplitude is highest, transmitting the downhole data in the decimal form, receiving the decimal data on the ground, then decoding the data, and completing the transmission of the downhole data. Compared with the mode of generally adopting fixed amplitude pulse transmission signals at present, the utilization rate of the pressure signals is obviously improved, the coding strength is reduced to a certain extent, the data transmission efficiency is obviously improved, meanwhile, along with the further improvement of the induction precision of the pressure sensor, the utilization way of the pressure signal amplitude can be further widened, and the transmission efficiency can also be synchronously improved.
Description
Technical field
The present invention relates to a kind of method for transmitting signals based on mud-pulse pressure magnitude, belong to petroleum engineering well drilling neck
Domain.
Background technique
The instruments such as existing MWD, APS generally change underground flow area using impulse generator, standpipe pressure are caused to change
Method, the wireless transmission of underground hole deviation, the information such as orientation is realized, so that ground staff understands downhole conditions.However, at present
The impulse generator of MWD, APS only have standard-sized sheet/close two states entirely, " 1 " and " 0 " are respectively indicated, using serial port communicating protocol
Realize data transmission.Therefore, mud pulse signal transmission at this stage generallys use binary coding mode.
But with the development of downhole parameters measurement pipe nipple, the transmission quantity of downhole data is increasing, real-time property requirement
Also higher, if continuing to be difficult to realize being obviously improved for data transmission capabilities using original coding mode.Binary coding is from
It is most efficient coding method from the point of view of reason device treatment effeciency, but limited underground high temperature, hyperbaric environment, underground are difficult to using high-performance
Processing circuit, year-on-year Ground Processing System, the weak status of generally existing operational capability.If considering processor treatment effeciency merely,
Be all made of binary coding, will cause down-hole treatment circuit can overload operation, and the problem of ground system utilization rate deficiency.
Therefore, it is necessary to be changed on transmission method, by data transmit in workload tilted toward ground system,
To improve the treatment effeciency of underground, the transmission demand of more big data quantity is adapted to.
Summary of the invention
It is an object of the invention to overcome the above problem of the existing technology, provide a kind of based on mud-pulse pressure width
The method for transmitting signals of value.The present invention is based on mud-pulses, utilize pressure magnitude information to greatest extent, realize that decimal coded passes
It is defeated, realize downhole data high efficiency of transmission.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of method for transmitting signals based on mud-pulse pressure magnitude, it is characterised in that: set 10 for pressure magnitude
The decimal form of a rank, successively unique corresponding number indicated in 0-9, indicates 0, pressure magnitude is most when pressure magnitude is minimum
9 are indicated when high, downhole data is transmitted with decimal form, and data decoding is carried out after the ground receiver decimal data, completes well
The transmission of lower data.
The method is continous way pressure magnitude adjusting method, is included the following steps:
A, continous way mud-pulse generating device output pressure amplitude is set to the decimal form of 10 ranks, successively
Unique corresponding number indicated in " 0-9 ", indicates 0, i.e. stepper motor does not push throttleng surface to advance, pulse when pulse amplitude is minimum
Indicate 9 when amplitude highest, i.e., pressure value p when stepper motor pushes throttleng surface advance h；
B, current pressure amplitude PtWhen=kp, then decimal form is expressed as 10k-1；
C, the position of mud-pulse transmitting apparatus is determined: the relationship being inversely proportional based on pressure magnitude and orifice size, according toFormula, wherein PtIndicate current pressure amplitude, Pt+1Indicate goal pressure amplitude, K indicates ratio
Example coefficient, HtIndicate the position that current time throttleng surface is in, Ht+1Expression reaches the position that goal pressure amplitude throttleng surface should be at
It sets；Obtain the distance H=H that stepper motor needs to drive throttleng surface mobilet+1-Ht, "+" expression advance, "-" expression retrogressing；
D, above-mentioned steps are based on, are encoded the data that need to be transmitted by turn with decimal form, driving throttleng surface is mobile
To different positions, different pressure magnitudes is generated in standpipe, ground carries out data decoding according to step b again, completes underground
The transmission of data.
The method is discrete type pressure magnitude adjusting method, is included the following steps:
1), the metering hole of at least ten different area on discrete type mud-pulse generating device lower valve base is determined
Justice specifies the corresponding relationship of each metering hole Yu 0-9 number；
2), output pressure of each metering hole under different displacements is tested, obtains homologous thread, and according to underground work
Waving interval is arranged in condition；
3), after entering well, downhole data is transmitted according to decimal representation, according to the relationship in step 1), by upper valve
Seat rotates different angles, and drilling fluid is made to pass through different metering holes；
4), after ground detection to pressure change, according to the curve in step 2, data decoding is completed, data are completed with this and are passed
It is defeated.
In the step b, the value rule of k is as follows:
PtWhen > 95%, k=100%；(95%, 85%] when, k=90%；(85%, 75%] when, k=80%；
(75%, 65%] when, k=70%；(65%, 55%] when, k=60%；(55%, 45%] when, k=50%；(45%, 35%]
When, k=40%；(35%, 25%] when, k=30%；(25%, 15%] when, k=20%；When < 15%, k=10%.
In the step b, n binary codes are converted into decimal number b, is p/b by amplitude modulation, realizes 1 pressure
Signal transmits n binary codes.
The continous way mud-pulse generating device, including inner cylinder, stepper motor and throttling body, inner cylinder are in truncated cone-shaped, section
Fluid is in hemisphere shape, and the hemisphere face for the body that throttles forms throttleng surface, and stepper motor is fluidly connected by catch bar and section, stepping electricity
Machine drives throttling body to enter inner cylinder through inner cylinder upper bottom surface outside inner cylinder and moves to bottom surface direction.
The throttling body enters inner cylinder from inner cylinder upper bottom surface and moves along axis to bottom surface.
The catch bar of the stepper motor is fixedly connected with the rounded face center of throttling body.
The throttling body circle radius surface r, inner cylinder upper bottom surface radius R1 and throttling body move to maximum distance in inner cylinder
Relationship of the place in the radius R in face are as follows: R2-r2≤R1 2。
In the step 1), the small metering hole of the high corresponding area of pressure magnitude, the low corresponding area of pressure magnitude is big
Metering hole.
The discrete type mud-pulse generating device includes upper valve base and lower valve base, is provided with hollowed out area on upper valve base,
It is sealing area outside hollowed out area, the different metering hole in multiple apertures is provided on lower valve base, multiple metering holes is located at same circle
Zhou Shang, when upper valve base turn to a metering hole it is corresponding with hollowed out area when, the metering hole formed drilling fluid distribution channel.
The hollowed out area being arranged on the upper valve base is 30 ° of fan-shaped hollow sections domain.
30 ° of independent fan sections of 12 equal parts are provided on the lower valve base, a metering hole is arranged in each fan section, and
12 metering hole sectional areas are different, wherein 10 metering holes are for corresponding to 0-9, in addition 2 metering holes can indicate start and stop.
The aperture that the metering hole is located at 12 o'clock direction position is maximum, and aperture is sequentially reduced along clockwise direction.
In 12 metering holes, any one is set on hole, and any one in addition to open hole is set as
Stop aperture.
The upper valve base is connected with the stepper motor with movable valve seat rotation.
Using the present invention has the advantages that
1, the present invention carries out downhole transmitted data encoding, binary coding mode relatively at this stage, well using the decimal system
Lower data processing work amount can be reduced centainly, and the adjusting frequency of impulse generator can significantly reduce, the data of surface acquisition system
Processing and decoding workload will increase, but the overall process amount on underground and ground does not increase.Since ground system processing capacity mentions
It is very convenient to rise, therefore the present invention is remarkably improved downhole data transmission efficiency.
2, the present invention uses the adjustable mud-pulse generating device of discrete type pressure magnitude, is based on rotary valve type pulse generation
Device structure, lower valve base are designed using more metering holes, and each metering hole sectional area size is different, is driven by stepper motor, can root
Suitable metering hole is automatically selected according to the pressure magnitude of demand, to realize the output of different pressures amplitude signal.
3, the present invention uses the adjustable mud-pulse generating device of discrete type pressure magnitude, sends out in traditional rotary valve type pulse
In raw device structure basis, the rotator type upper valve base of the more metering holes of innovative design, exportable ten kinds of different pressure magnitude signals.Often
The pressure magnitude signal of a metering hole output can be tested on ground, and waving interval appropriate is set in underground work,
The pressure magnitude signal then exported can number in one a pair of " 0-9 ", realize decimal coded, improve downhole data transmission
Efficiency.
4, the present invention uses the adjustable mud-pulse generating device of continous way pressure magnitude, and inner cylinder uses tapered surface, throttling
Face is driven by stepper motor, when throttleng surface is located at different inner cylinder positions, may make inner cylinder cavity area different, as a result,
In the case where mud displacement is certain, realize that different pressure magnitudes is adjusted.Using stepper motor as driving part, driving essence
Degree it is high, it can be achieved that pressure magnitude consecutive variations.
5, the present invention uses the adjustable mud-pulse generating device of continous way pressure magnitude, utilizes the high-precision of stepper motor
Control characteristic is applied in taper pulse generating unit, realizes continuously adjusting for pulse amplitude, can be defeated as desired
The pressure signal of different amplitudes out can provide basis for efficient data transfer mode.
Detailed description of the invention
Fig. 1 is the present invention and classical signal transmitted waveform contrast schematic diagram；
Fig. 2 is the adjustable mud-pulse generating device schematic illustration of continous way pressure magnitude used；
Fig. 3 is the upper valve base structural schematic diagram using the adjustable mud-pulse generating device of discrete type pressure magnitude；
Fig. 4 is the lower valve base structural schematic diagram using the adjustable mud-pulse generating device of discrete type pressure magnitude；
Fig. 5 is to be aligned using the upper valve base and lower valve base maximum of the adjustable mud-pulse generating device of discrete type pressure magnitude
When structural schematic diagram；
Fig. 6 is to be shown using the output pressure pulse signal curve of the adjustable mud-pulse generating device of discrete type pressure magnitude
It is intended to.
In the figure, it is marked as 1, inner cylinder, 2, stepper motor, 3, throttling body, 4, catch bar, 5, upper valve base, 6, lower valve base, 7, engrave
Empty region, 8, metering hole.
Specific embodiment
Embodiment 1
A kind of method for transmitting signals based on mud-pulse pressure magnitude, comprising: set 10 ranks for pressure magnitude
Decimal form, successively unique corresponding number indicated in 0-9 indicates 0 when pressure magnitude is minimum, table when pressure magnitude highest
Show 9, downhole data is transmitted with decimal form, and data decoding is carried out after the ground receiver decimal data, completes downhole data
Transmission.
The method is continous way pressure magnitude adjusting method, is included the following steps:
A, continous way mud-pulse generating device output pressure amplitude is set to the decimal form of 10 ranks, successively
Unique corresponding number indicated in " 0-9 ", indicates 0, i.e. stepper motor does not push throttleng surface to advance, pulse when pulse amplitude is minimum
Indicate 9 when amplitude highest, i.e., pressure value p when stepper motor pushes throttleng surface advance h；
B, current pressure amplitude PtWhen=kp, then decimal form is expressed as 10k-1；
C, the position of mud-pulse transmitting apparatus is determined: the relationship being inversely proportional based on pressure magnitude and orifice size, according toFormula, wherein PtIndicate current pressure amplitude, Pt+1Indicate goal pressure amplitude, K indicates ratio
Example coefficient, HtIndicate the position that current time throttleng surface is in, Ht+1Expression reaches the position that goal pressure amplitude throttleng surface should be at
It sets；Obtain the distance H=H that stepper motor needs to drive throttleng surface mobilet+1-Ht, "+" expression advance, "-" expression retrogressing；
D, above-mentioned steps are based on, are encoded the data that need to be transmitted by turn with decimal form, driving throttleng surface is mobile
To different positions, different pressure magnitudes is generated in standpipe, ground carries out data decoding according to step b again, completes underground
The transmission of data.
The method is discrete type pressure magnitude adjusting method, is included the following steps:
1), the metering hole of at least ten different area on discrete type mud-pulse generating device lower valve base is determined
Justice specifies the corresponding relationship of each metering hole Yu 0-9 number；
2), output pressure of each metering hole under different displacements is tested, obtains homologous thread, and according to underground work
Waving interval is arranged in condition；
3), after entering well, downhole data is transmitted according to decimal representation, according to the relationship in step 1), by upper valve
Seat rotates different angles, and drilling fluid is made to pass through different metering holes；
4), after ground detection to pressure change, according to the curve in step 2, data decoding is completed, data are completed with this and are passed
It is defeated.
In the step b, the value rule of k is as follows:
PtWhen > 95%, k=100%；(95%, 85%] when, k=90%；(85%, 75%] when, k=80%；
(75%, 65%] when, k=70%；(65%, 55%] when, k=60%；(55%, 45%] when, k=50%；(45%, 35%]
When, k=40%；(35%, 25%] when, k=30%；(25%, 15%] when, k=20%；When < 15%, k=10%.
In the step b, n binary codes are converted into decimal number b, is p/b by amplitude modulation, realizes 1 pressure
Signal transmits n binary codes.
In the step 1), corresponding relationship can be defined arbitrarily, but for rule, the present embodiment is high using pressure magnitude
The small metering hole of corresponding area, the big metering hole of the low corresponding area of pressure magnitude.
Embodiment 2
A kind of method for transmitting signals based on mud-pulse pressure magnitude sets 10 ranks for pressure magnitude, successively
Unique corresponding number indicated in " 0-9 ", single pressure magnitude can indicate 4bit data as a result, compare binary system, single pressure
Amplitude is only capable of indicating that 1bit data, efficiency of transmission will be significantly improved.
As shown in Figure 1, classical signal is transmitted, 2 systems are to indicate 1 decimal number with 4, and 0-9 of the present invention can use 1
Wave table shows.
Embodiment 3
The present embodiment is illustrated below in conjunction with Fig. 2.The realization that Fig. 2 is adjusted as just impulse generator pressure magnitude
One of mode, primarily to the realization process of method for transmitting signals is clearly described, not as rights protection point.
The adjustable mud-pulse generating device of continous way pressure magnitude that the present embodiment uses, including inner cylinder 1 further include step
Into motor 2 and throttling body 3, inner cylinder 1 is in truncated cone-shaped, and throttling body 3 is in hemisphere shape, and the hemisphere face of throttling body 3 forms throttleng surface, step
Connect into motor 2 by catch bar 4 with throttling body 3, stepper motor 2 drive throttle body 3 outside the inner cylinder 1 through 1 upper bottom surface of inner cylinder into
Enter inner cylinder 1 to move to bottom surface direction.
The throttling body 3 enters inner cylinder 1 from 1 upper bottom surface of inner cylinder and moves along axis to bottom surface.
The catch bar 4 of the stepper motor 2 is fixedly connected with the rounded face center of throttling body 3.
The round radius surface r of the throttling body 3,1 upper bottom surface radius R1 of inner cylinder and throttling body 3 move to maximum in inner cylinder 1
Relationship of the place distance H in round radius R are as follows: R2-r2≤R1 2。
Continous way pressure magnitude regulating step is as follows:
1, pressure value P when stepper motor promotion throttleng surface advance h, pulse amplitude highest；
2, pressure value p when stepper motor promotion throttleng surface advance H+h, pulse amplitude are minimum；
3, in the section pressure magnitude [P, p], by adjusting stepper motor, driving throttleng surface enters different positions, can be defeated
Continous way pressure magnitude signal out.
By taking Fig. 2 pressure adjusting structure as an example, method for transmitting signals realizes that steps are as follows.
1,0 is indicated when pulse amplitude is minimum, i.e. stepper motor does not push throttleng surface to advance, and when pulse amplitude highest indicates 9,
Pressure value p with shown in Fig. 2, i.e., when stepper motor pushes throttleng surface advance h.
2, pressure magnitude PtWhen=kp, then it represents that the value rule of 10k-1, k are as follows:
When > 95%, k=100%；(95%, 85%] when, k=90%；(85%, 75%] when, k=80%；(75%,
When 65%], k=70%；(65%, 55%] when, k=60%；(55%, 45%] when, k=50%；(45%, 35%] when, k=
40%；(35%, 25%] when, k=30%；(25%, 15%] when, k=20%；When < 15%, k=10%.
3, the position of mud-pulse transmitting apparatus is determined: the relationship being inversely proportional based on pressure magnitude and orifice size, according toFormula, wherein PtIndicate current pressure amplitude, Pt+1Indicate goal pressure amplitude, K indicates ratio
Example coefficient, indicates the relationship of orifice size and pressure, belongs to one of characteristic of equipment itself, according to different impulse generators,
It is obtained by room pressure calibration test, HtIndicate the position that current time throttleng surface is in, Ht+1Expression reaches goal pressure width
The position that value throttleng surface should be at；H=Ht+1-HtThe distance that stepper motor needs to drive throttleng surface mobile is indicated, before "+" expression
Into "-" indicates to retreat.
4, above-mentioned steps are based on, are encoded the data that need to be transmitted by turn with decimal form, driving throttleng surface is mobile
To different positions, different pressure magnitudes is generated in standpipe with this, ground is carrying out data solution according to the rule in step 2
Code completes the transmission of downhole data as a result,.
5, compression force sensor measuring precision limits at this stage, can ensure transmission precision using the design in step 2, but adopt
After sample precision improves, the utilization rate of pressure signal amplitude can be further widened.N binary codes are such as converted into decimal number b,
It is p/b by amplitude modulation, then 1 pressure signal can be achieved and transmit n binary codes.
Embodiment 4
The present embodiment combination attached drawing, the adjustable mud-pulse of discrete type pressure magnitude that can be used to the present invention fill
It sets and is illustrated.
The adjustable mud-pulse generating device of discrete type pressure magnitude is based on rotary valve type pulse generation as shown in the picture
Device structure, lower valve base 6 are designed using more metering holes, and each 8 sectional area size of metering hole is different, is driven by stepper motor, can
Pressure magnitude according to demand automatically selects suitable metering hole, to realize the output of different pressures amplitude signal.
1 30 ° of fan-shaped hollow section domain 7 is designed on upper valve base 5, other regions are fully sealed, and lower valve base 6 uses more metering holes
Design, is divided into 30 ° of independent fan sections of 12 equal parts, and the metering hole sectional area size in each fan section is different, by stepping electricity
Machine driving, can pressure magnitude according to demand automatically select suitable metering hole, to realize the defeated of different pressures amplitude signal
Out.
Discrete type pressure magnitude regulating step is as follows:
1, in design, each metering hole of lower valve base is defined, specifies corresponding pass of each metering hole with " 0-9 " number
System, remaining 2 metering hole can indicate start and stop, and equal proportion design can be used in the area ratio of each metering hole；
2, after the completion of designing, output pressure of each metering hole under different displacements is tested, obtains homologous thread, such as
Shown in Fig. 6, and waving interval is arranged according to underground working；
3, after entering well, downhole data is transmitted according to decimal representation, according to the relationship in step 1, by stepping electricity
Machine driving rotator type upper valve base rotates different angles, so that drilling fluid be made to pass through different metering holes；
4, after ground detection to pressure change, according to the curved line relation formula in step 2, data decoding is completed, is completed with this
Data transmission.
To sum up, the present invention utilizes the variation of pressure magnitude, and the transmission of downhole data is realized in a manner of decimal coded, is compared
The mode of fixed amplitude pulse transmission signal is generallyd use at present, and the utilization rate of pressure signal significantly improves, and encoding strength obtains
Certain reduction, data transmission efficiency are obviously improved, meanwhile, as the induction precision of pressure sensor further mentions
Rise, the utilization ways of pressure signal amplitude can step broadening, efficiency of transmission can also synchronize raising.
The foregoing is merely the most representative embodiment of the present invention, done in all claims according to the present invention
Equivalent changes and modifications, should belong to covering scope of the invention.
Claims (10)
1. a kind of method for transmitting signals based on mud-pulse pressure magnitude, it is characterised in that: set 10 for pressure magnitude
The decimal form of rank, successively unique corresponding number indicated in 0-9, indicates 0, pressure magnitude highest when pressure magnitude is minimum
When indicate 9, downhole data is transmitted with decimal form, after the ground receiver decimal data carry out data decoding, complete underground
The transmission of data.
2. the method for transmitting signals according to claim 1 based on mud-pulse pressure magnitude, it is characterised in that: the side
Method is continous way pressure magnitude adjusting method, is included the following steps:
A, continous way mud-pulse generating device output pressure amplitude is set to the decimal form of 10 ranks, successively uniquely
The corresponding number indicated in " 0-9 ", indicates 0, i.e. stepper motor does not push throttleng surface to advance, pulse amplitude when pulse amplitude is minimum
Indicate 9 when highest, i.e., pressure value p when stepper motor pushes throttleng surface advance h；
B, current pressure amplitude PtWhen=kp, then decimal form is expressed as 10k-1；
C, the position of mud-pulse transmitting apparatus is determined: the relationship being inversely proportional based on pressure magnitude and orifice size, according toFormula, wherein PtIndicate current pressure amplitude, Pt+1Indicate goal pressure amplitude, K indicates ratio
Example coefficient, HtIndicate the position that current time throttleng surface is in, Ht+1Expression reaches the position that goal pressure amplitude throttleng surface should be at
It sets；Obtain the distance H=H that stepper motor needs to drive throttleng surface mobilet+1-Ht, "+" expression advance, "-" expression retrogressing；
D, above-mentioned steps are based on, are encoded the data that need to be transmitted by turn with decimal form, driving throttleng surface is moved to not
Same position generates different pressure magnitudes in standpipe, and ground carries out data decoding according to step b again, completes downhole data
Transmission.
3. the method for transmitting signals according to claim 1 based on mud-pulse pressure magnitude, it is characterised in that: the side
Method is discrete type pressure magnitude adjusting method, is included the following steps:
1), the metering hole of at least ten different area on discrete type mud-pulse generating device lower valve base is defined, it is bright
The corresponding relationship of true each metering hole and 0-9 number；
2), output pressure of each metering hole under different displacements is tested, obtains homologous thread, and set according to underground working
Set waving interval；
3), after entering well, downhole data is transmitted according to decimal representation, according to the relationship in step 1), is turned by upper valve base
Different angles is moved, drilling fluid is made to pass through different metering holes；
4), after ground detection to pressure change, according to the curve in step 2, data decoding is completed, data transmission is completed with this.
4. the method for transmitting signals according to claim 2 based on mud-pulse pressure magnitude, it is characterised in that: the step
In rapid b, the value rule of k is as follows:
PtWhen > 95%, k=100%；(95%, 85%] when, k=90%；(85%, 75%] when, k=80%；
(75%, 65%] when, k=70%；(65%, 55%] when, k=60%；(55%, 45%] when, k=50%；
(45%, 35%] when, k=40%；(35%, 25%] when, k=30%；(25%, 15%] when, k=20%；< 15%
When, k=10%.
5. the method for transmitting signals according to claim 4 based on mud-pulse pressure magnitude, it is characterised in that: the step
In rapid b, n binary codes are converted into decimal number b, are p/b by amplitude modulation, realize 1 pressure signal transmission position n two into
Code processed.
6. according to the method for transmitting signals based on mud-pulse pressure magnitude described in claim 2,4 or 5, it is characterised in that:
The continous way mud-pulse generating device, including inner cylinder (1), stepper motor (2) and throttling body (3), inner cylinder (1) are in rotary table
Shape, throttling body (3) be in hemisphere shape, throttling body (3) hemisphere face formed throttleng surface, stepper motor (2) by catch bar (4) with
Throttle body (3) connection, stepper motor (2) drive throttling body (3) from inner cylinder (1) outside through inner cylinder (1) upper bottom surface enter inner cylinder (1) to
The movement of bottom surface direction.
7. the method for transmitting signals according to claim 6 based on mud-pulse pressure magnitude, it is characterised in that: the section
Fluid (3) circle radius surface r, inner cylinder (1) upper bottom surface radius R1 and throttling body (3) move to maximum distance apart in inner cylinder (1)
The relationship of the radius R in place face are as follows:
8. the method for transmitting signals according to claim 3 based on mud-pulse pressure magnitude, it is characterised in that: the step
It is rapid 1) in, the small metering hole of the high corresponding area of pressure magnitude (8), the big metering hole of the low corresponding area of pressure magnitude (8).
9. the method for transmitting signals based on mud-pulse pressure magnitude according to claim 3 or 8, it is characterised in that: institute
Stating discrete type mud-pulse generating device includes upper valve base (5) and lower valve base (6), and upper valve base is provided with hollowed out area on (5)
(7), hollowed out area (7) are sealing area outside, are provided with the different metering hole in multiple apertures (8), multiple current limlitings on lower valve base (6)
Hole (8) is located on same circumference, when upper valve base (5) turn to a metering hole (8) it is corresponding with hollowed out area (7) when, the limit
Discharge orifice (8) forms drilling fluid distribution channel.
10. the method for transmitting signals according to claim 9 based on mud-pulse pressure magnitude, it is characterised in that: described
The hollowed out area (7) being arranged on upper valve base (5) is 30 ° of fan-shaped hollow sections domain (7)；12 etc. are provided on the lower valve base (6)
The 30 ° of independent fan sections divided, a metering hole (8) is arranged in each fan section, and 12 metering hole (8) sectional areas are different,
In 10 metering holes (8) for corresponding to 0-9, in addition 2 metering holes (8) can indicate start and stop.
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| CN201910799484.3A CN110500087B (en) | 2019-08-28 | 2019-08-28 | Signal transmission method based on mud pulse pressure amplitude |
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