CN109854234A - Mud pulse signal detection method - Google Patents
Mud pulse signal detection method Download PDFInfo
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- CN109854234A CN109854234A CN201910211534.1A CN201910211534A CN109854234A CN 109854234 A CN109854234 A CN 109854234A CN 201910211534 A CN201910211534 A CN 201910211534A CN 109854234 A CN109854234 A CN 109854234A
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Abstract
The present invention proposes a kind of mud pulse signal detection method, includes the following steps: to calculate spread speed c of the pulse signal in mud, according to the frequency f of the first pulse signal1Two pressure sensor intervals are set on the pipeline path of slush pump, so that the spacing of two pressure sensors existsIt is interior, wherein n=0,1,2 ...；And handled using collected signal of the time domain delay calculus of finite differences to two pressure sensors, the mud pulse signal of high quality is obtained, mud pulse signal testing requirements are met, is had very high with brill operation field application value.
Description
Technical field
The invention belongs to oil gas drilling measuring technology field more particularly to a kind of mud pulse signal detection methods.
Background technique
Currently, mud-pulse transmission technology with its good reliability, lower development cost, on a large scale apply well depth
Etc. global advantages, be it is the most widely used with bore data transfer mode.Particularly, with the continuous wave mud of higher transmission rates
Slurry pulse significantly reduces overall cost, the underground number of significant increase measurement while drilling, logging operation because it significantly improves drilling depth efficiency
According to processing capability in real time and geosteering, formation evaluation ability, the primary selection being increasingly becoming in oil/gas drilling is ground there are huge
Study carefully value and broad mass market prospect.
From the point of view of the ground detection of continuous wave mud-pulse, signal to be detected is one by drilling pump noise, reflecting background
With a series of random noises (shaft bottom mechanical oscillation, Instability of drilling string, mud friction etc. cause) institute's severe jamming and intensity with biography
The defeated apparent low signal-to-noise ratio small-signal of range attenuation, thus it is how larger from amplitude, in the Complex Noise background of broad bandwidth
Detect that useful signal becomes the critical issue in mud-pulse transmission technology, and this point is for the company with high speed characteristics
Continuous wave mud-pulse transmission is particularly important.From the point of view of current progress, traditional single pressure sensor signal acquisition
Mode is difficult to meet the testing requirements of the continuous wave mud-pulse of Complex Noise interference, based on dual pressure sensor (hereinafter referred to as:
Dual sensor) signal detecting method have become continuous wave mud-pulse detection leading edge developments direction.
In order to which high quality detection goes out continuous wave pulse signal, it is necessary to the reasonable clipping room for determining dual sensor away from.Article
" the down-hole slurry pressure signal for eliminating pump pressure interference postpones pressure detection method (Delay pressure detection
method to eliminate pump pressure interference on the downhole mud pressure
Signals) " mention that dual sensor spacing is related with pressure signal attenuation characteristic, when the signal of continuous wave mud continuous pressure wave
Frequency is less than 40Hz, and when the distance between dual sensor is less than 18m, decline of pressure coefficient will be greater than 0.988, and when two sensings
When device is close to each other, attenuation coefficient will be close to 1, however, this article has ignored reconstruction signal caused by being changed by dual sensor spacing
Quality difference does not provide dual sensor spacing preferred method yet；Likewise, article " reliable high velocity mud pulse telemetering
(Reliable high-speed mud pulse telemetry) " and article are " for the adaptive of continuous wave mud-pulse telemetry
Answer dual sensor noise cancellation method (Adaptive dual-sensor noise cancellation method for
Continuous wave mud pulse telemetry) " point out dual sensor clipping room away to continuous wave mud-pulse letter
Number final detection quality have a significant impact, irrelevantly spacing is likely to make noise signal excessive distortion or can not examine
Out, but optimal dual sensor spacing does not obtain theoretic derivation still.
In addition, U.S. patent Nos US8,009, the 511B2 " pressure waveform coupling (Pressure based on dual sensor
Waves decoupling with two transducers) ", disclose a kind of mud pulse signal based on dual sensor
Detection mode, and dual sensor input signal is processed by effectively continuous wave signal and other noises by certain algorithm,
Such as pump noise；But sensor spacing is preferably not directed to；2015/0226058 A1 of U.S. patent Nos US " is connect using signal
Receive the mud-pressure-pulse telemetry system and method (Mud pulse telemetry systems and of array-processing techniques
Methods using receive array processing) ", disclose a kind of mud based on contactless dual sensor
Pulse signal detection mode does not provide dual sensor spacing preferred method yet；Publication No. is the middle promulgated by the State Council of 108533256 A of CN
A kind of underground of bright patent application publication and ground multisensor array acquisition system, including being arranged on standpipe and mud
The multiple pressure sensors of pump nearby, near air packet, by the way that multi-sensor data is merged and can more fully be analyzed
Mud-pulse pressure signal, but the preferred spacing between sensor is not discussed yet.
Summary of the invention
The present invention for the above technical issues, proposes a kind of mud that effective signal detection is carried out using dual sensor
Pulse signal detection method.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of mud pulse signal detection method includes the following steps: to calculate spread speed of the pulse signal in mud
C, according to the frequency f of the first pulse signal1Two pressure sensor intervals are set on the pipeline path of slush pump, so that two
The spacing of pressure sensor existsIt is interior, and the detection using time domain delay calculus of finite differences to two pressure sensors
To signal handled, wherein n=0,1,2 ....
Preferably, including the following steps: the frequency f according to the first pulse signal1Two pressure sensor intervals are set
In on the pipeline path of slush pump, so that the spacing of two pressure sensors is equal toWherein, n=0,1,2 ....
Preferably, including the following steps: the frequency f according to the second pulse signal2, third pulse signal frequency
f3..., the frequency f of w pulse signalwTwo pressure sensor intervals are set on the pipeline path of slush pump, so that two
The spacing of pressure sensor existsIntersection in,
Wherein, n=0,1,2 ...；W=2,3,4 ....
Preferably, further including following steps: the bulk modulus K of measurement mud solid phase liquid and gass、Kl、Kg,
The solid phase of mud and the volumetric concentration β of gas phases、βg, solid phase, the density p of liquid and gas of muds、ρl、ρg, and according to drill string
Elastic modulus E, drill string wall thickness e and drill string internal diameter D calculate pulse signal spread speed c, calculation formula is as follows:
Wherein, Φ is impact factor.
Preferably, further including following steps: being calculated according to drill string Poisson's ratio δ, drill string wall thickness e and drill string internal diameter D influences
Factor Φ, calculation formula are as follows:
Compared with prior art, the advantages and positive effects of the present invention are:
Mud pulse signal detection method of the present invention, installs two pressure sensors, and by two pressure sensings
The distance controlling of device is in preferred spacingIt is interior, so that the signal detected to two pressure sensors is by time domain
After delay difference point-score is handled, meet the continuous wave mud pulse signal testing requirements of high quality, there is very high field application
Value.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of mud pulse signal detection method of the present invention；
Fig. 2 is the schematic diagram of mud pulse signal detection device of the present invention.
In above each figure: 1, continuous wave pulse signal；2, surface line；3, slush pump；4, noise；5, S1 pressure sensing
Device；6, S2 pressure sensor；, 7, signal processing unit.
Specific embodiment
In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one
In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments
In.
In the description of the present invention, it is to be understood that, term " center ", "upper", "lower", "front", "rear", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on the figure
Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or integrally connected；It can be with
It is to be connected directly, the connection inside two elements can also be can be indirectly connected through an intermediary.For the general of this field
For logical technical staff, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
With reference to Fig. 1 and Fig. 2, the present invention proposes that a kind of mud pulse signal detection method includes the following steps, calculates pulse
Spread speed c of the signal in mud, according to the frequency f of the first pulse signal1Two pressure sensor intervals are set to mud
On the pipeline path of pump, so that the spacing of two pressure sensors existsIt is interior, wherein n=0,1,2 ...；And
It is handled using the signal that time domain delay calculus of finite differences detects two pressure sensors.
Mud pulse signal detection method of the present invention, installs two pressure sensors, and by two pressure sensings
The distance controlling of device is in preferred spacingIt is interior so that the signal that two pressure sensors are detected according to when
After domain delay difference point-score is handled, the continuous wave mud pulse signal of high quality is obtained, mud pulse signal testing requirements are met.
Below with reference to Fig. 1 and Fig. 2, the specific steps of the present invention is described in detail mud pulse signal detection method:
As shown in Fig. 2, from the upward fading transmission of continuous wave pulse signal 1 that underground occurs to ground lift line 2, and have
The pump noise 4 that slush pump 3 generates transmits oppositely downward, and continuous wave pulse signal 1 and pump noise 4 are at the lift line 2 on ground
It meets superposition, forms the signal of low signal-to-noise ratio (general < 0dB), and via surface-based lift line 2 to slush pump 3
S1 pressure sensor 5 and S2 pressure sensor 6 on pipeline path acquire.
For continuous wave pulse signal based on BFSK modulation, the selection of spacing between two pressure sensors is described in detail
Algorithm.BFSK signal is combined by two pulse signals of the first pulse signal and the second pulse signal, and the first pulse signal indicates
Data 0 are sent, the second pulse signal indicates to send data 1.Without loss of generality, f can be enabled1=12Hz, f2=18Hz；
The spread speed of first pulse signal and the second pulse signal can be pushed away according to continuity equation in UNSTEADY FLOW theory
Out:
Impact factor Φ is further indicated that are as follows:
Wherein, Ks、Kl、KgRespectively indicate solid phase, the bulk modulus of liquid and gas, Pa；βs、βgRespectively indicate solid phase
With the volumetric concentration of gas phase；ρs、ρl、ρgRespectively indicate solid phase, the density of liquid and gas, kg/m3；E is the springform of drill string
Amount, Pa；E indicates drill string wall thickness, m；D indicates drill string internal diameter, m；δ is drill string Poisson's ratio.Gaseous phase volume elasticity modulus Kg=m*P, m
For specific heats of gases appearance, enabling m=1.2, P is inner pressure inside pipe.It equally, without loss of generality, can be in terms of according to actual well drilled scene
The spread speed c=1141.9m/s obtained.
In the application, S1 pressure sensor 5 and 6 sensor spacing of S2 pressure sensor cross conference and make to acquire signal decaying sternly
Weight, while considering drilling mud pipeline actual installation situation, the clipping room of S1 pressure sensor 5 and S2 pressure sensor 6 away from
It should generally control within 100m.
According to the Computing Principle of time domain delay calculus of finite differences, the corresponding output of the segment signal are as follows:
From formula (3) as can be seen that output signal amplitude be 2sin (ω Δ t), when Δ t takes (4n+1) T/4,
Amplitude has maximum value；When Δ t takes (4n+3) T/4, amplitude is minimum value；When Δ t takes (2n+1) T/2, amplitude 0；Wherein,
N=0,1,2 ... ..., T are pulse signal cycle.
Therefore, by f1=12Hz and f2=18Hz brings into formula (4) respectively and is calculated:
To obtain corresponding optimum distance LGood 1、LGood 2Are as follows:
By f1=12Hz, f2=18Hz brings into formula (6) respectively and is calculated:
Clipping room to should be avoided is away from LKeep away 1、LKeep away 2Are as follows:
To sum up, f1The first pulse signal and f of=12Hz2Corresponding preferable two pressures of the second pulse signal of=18Hz
Force snesor clipping room is away from range LExcellent 1、LExcellent 2Are as follows:
To sum up, for by f1The first pulse signal and f of=12Hz2The BFSK of the second pulse signal composition of=18Hz connects
Signal is transmitted in continuous wave impulse, and two preferable pressure sensor clipping rooms are to inhibit to the maximum extent away from being (0m, 31.7m)
Influence of noise, it is proposed that two pressure sensor clipping rooms are away from selecting close to the position of 15.9m and 23.8m, at this time signal processing list
After collected signal is carried out calculation processing by time domain delay calculus of finite differences by member 7, it will obtain the Reconstruction Impulse letter of high quality
Number.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (5)
1. a kind of mud pulse signal detection method, which comprises the steps of: calculate pulse signal in mud
Spread speed c, according to the frequency f of the first pulse signal1Two pressure sensor intervals are set on the pipeline path of slush pump,
So that the spacing of two pressure sensors existsIt is interior, and using time domain delay calculus of finite differences to two pressure sensings
The signal that device detects is handled, wherein n=0,1,2 ....
2. mud pulse signal detection method according to claim 1, which comprises the steps of: according to
The frequency f of one pulse signal1Two pressure sensor intervals are set on the pipeline path of slush pump, so that two pressure sensings
The spacing of device is equal toWherein, n=0,1,2 ....
3. mud pulse signal detection method according to claim 1, which comprises the steps of: according to
The frequency f of two pulse signals2, third pulse signal frequency f3..., the frequency f of w pulse signalwBy two pressure sensings
Device interval is set on the pipeline path of slush pump, so that the spacing of two pressure sensors exists Intersection in, wherein n=0,1,2 ...；W=2,3,4 ....
4. mud pulse signal detection method described in -3 any one according to claim 1, which is characterized in that further include as follows
Step: the bulk modulus K of measurement mud solid phase liquid and gass、Kl、Kg, the solid phase of mud and the volumetric concentration of gas phase
βs、βg, solid phase, the density p of liquid and gas of muds、ρl、ρg, and according to the elastic modulus E of drill string, drill string wall thickness e and drill string
Internal diameter D calculates pulse signal spread speed c, and calculation formula is as follows:
Wherein, Φ is impact factor.
5. mud pulse signal detection method according to claim 4, which is characterized in that further include following steps: according to
Drill string Poisson's ratio δ, drill string wall thickness e and drill string internal diameter D calculate impact factor Φ, and calculation formula is as follows:
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| CN201910211534.1A CN109854234B (en) | 2019-03-20 | 2019-03-20 | Mud pulse signal detection method |
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| CN201910211534.1A CN109854234B (en) | 2019-03-20 | 2019-03-20 | Mud pulse signal detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060012A (en) * | 2022-01-18 | 2022-02-18 | 中国石油大学胜利学院 | Mud pulse signal detection device |
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| US3742443A (en) * | 1970-07-27 | 1973-06-26 | Mobil Oil Corp | Apparatus for improving signal-to-noise ratio in logging-while-drilling system |
| GB2361789A (en) * | 1999-11-10 | 2001-10-31 | Schlumberger Holdings | Mud-pulse telemetry receiver |
| CN102900430A (en) * | 2012-09-16 | 2013-01-30 | 中国石油大学(华东) | Pumping pressure interference elimination method for drilling fluid continuous pressure wave signals |
| US20150226058A1 (en) * | 2012-08-18 | 2015-08-13 | Halliburton Energy Services, Inc. | Mud pulse telemetry systems and methods using receive array processing |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3742443A (en) * | 1970-07-27 | 1973-06-26 | Mobil Oil Corp | Apparatus for improving signal-to-noise ratio in logging-while-drilling system |
| GB2361789A (en) * | 1999-11-10 | 2001-10-31 | Schlumberger Holdings | Mud-pulse telemetry receiver |
| US20150226058A1 (en) * | 2012-08-18 | 2015-08-13 | Halliburton Energy Services, Inc. | Mud pulse telemetry systems and methods using receive array processing |
| CN102900430A (en) * | 2012-09-16 | 2013-01-30 | 中国石油大学(华东) | Pumping pressure interference elimination method for drilling fluid continuous pressure wave signals |
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| 何树山等: "钻井液正脉冲信号的衰减分析", 《钻采工艺》 * |
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|---|---|---|---|---|
| CN114060012A (en) * | 2022-01-18 | 2022-02-18 | 中国石油大学胜利学院 | Mud pulse signal detection device |
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