CN116136171A - Signal acquisition and processing method and device for measuring resistivity of electromagnetic waves while drilling - Google Patents
Signal acquisition and processing method and device for measuring resistivity of electromagnetic waves while drilling Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 22
- 230000002238 attenuated effect Effects 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 29
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 9
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- 238000000034 method Methods 0.000 abstract description 8
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
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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
- E21B47/13—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 by electromagnetic energy, e.g. radio frequency
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The invention relates to the technical field of resistivity measurement, in particular to a signal acquisition and processing method and a device for measuring the resistivity of electromagnetic waves while drilling, wherein the method comprises the following steps: transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to a stratum to be tested; receiving two paths of receiving signals reflected by the stratum to be detected after attenuation; amplifying and mixing the received two paths of received signal signals, and converting the high-frequency component into the low-frequency component to obtain two paths of 5K sinusoidal signals; obtaining the resistivity corresponding to two paths of 5K sine signals; taking the average value of the two resistivities, wherein the average value is the resistivity of the stratum to be measured. According to the invention, two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals are transmitted to the stratum to be measured, and the resistivity of the stratum to be measured is obtained by receiving the two paths of receiving signals reflected back after the stratum to be measured is attenuated, so that the directional signals and the geological parameters are well combined, meanwhile, the acquisition of 2000KHz and 400KHz signals is simple, the implementation process is not complex, and the measurement efficiency of petroleum engineering is improved.
Description
Technical Field
The invention relates to the technical field of resistivity measurement, in particular to a signal acquisition and processing method and device for electromagnetic wave resistivity measurement while drilling.
Background
At present, oilfield block development has reached mid-to-late stages, and geosteering instrumentation has become quite important in order to develop thin reservoirs of oil as well as residual oil. Resistivity measurement while drilling is one of the cores of logging while drilling technology and is a key technology for timely evaluating oil and gas layers. Logging While Drilling (LWD) is a measurement while drilling system with more complete functions and more complex structures developed on the basis of Measurement While Drilling (MWD), mainly comprises measuring pup joints such as resistivity, neutrons, density, sound waves and the like added on the basis of conventional MWD, and is used for acquiring logging information, wherein the LWD transmits more information compared with the MWD. Currently, in offshore oil fields abroad and large well deviation directional wells on land, almost all open hole logging operations adopt logging while drilling technology. Resistivity is the primary means for geologic parameter measurement, and is the primary parameter reflecting formation properties, while drilling formation resistivity measurement is a key component of logging while drilling. Currently used resistivity measurement while drilling tools are most widely used for electromagnetic resistivity measurement while drilling. Since electromagnetic waves produce amplitude attenuation and phase shift when traversing the formation, and the amplitude attenuation and phase shift produced are determined by the resistivity and dielectric constant characteristics of the formation, electromagnetic waves produce amplitude attenuation and phase shift that are different when traversing different formation media. The existing measurement method for the resistivity of the electromagnetic wave while drilling has the defect that a complex circuit system is required for directly collecting signals of 2000KHz and 400 KHz.
Disclosure of Invention
The invention provides a signal acquisition and processing method and device for measuring the resistivity of electromagnetic waves while drilling, which overcome the defects of the prior art, and can effectively solve the problem that the existing method for measuring the resistivity of electromagnetic waves while drilling is complex in the process of directly acquiring signals of 2000KHz and 400 KHz.
One of the technical schemes of the invention is realized by the following measures: a signal acquisition and processing method for measuring the resistivity of electromagnetic waves while drilling comprises the following steps:
transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to a stratum to be tested;
receiving two paths of receiving signals reflected by the stratum to be detected after attenuation, wherein the two paths of receiving signals are a first receiving signal and a second receiving signal respectively;
amplifying and mixing the received two paths of received signal signals, and converting the high-frequency component into the low-frequency component to obtain two paths of 5K sinusoidal signals;
obtaining the resistivity corresponding to two paths of 5K sine signals;
taking the average value of the two resistivities, wherein the average value is the resistivity of the stratum to be measured.
The following are further optimizations and/or improvements to the above-described inventive solution:
the transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the stratum to be measured includes:
alternately generating a 400K sine signal, a 2M sine signal and a synchronous signal;
amplifying the 400K sinusoidal signal and the 2M sinusoidal signal;
sequentially conducting the four transmitting coils by using a synchronizing signal;
and performing power matching and frequency selection on the amplified 400K sinusoidal signals and 2M sinusoidal signals, and transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to a stratum to be tested by four transmitting coils.
The second technical scheme of the invention is realized by the following measures: a signal acquisition and processing device for measuring the resistivity of electromagnetic waves while drilling comprises a transmitting end and a receiving end; the receiving end comprises a first receiving coil, a second receiving coil, a first processing unit and a second processing unit;
the transmitting end transmits two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the stratum to be tested;
the first receiving coil receives a first receiving signal reflected by the stratum to be detected after attenuation;
the second receiving coil receives a second receiving signal reflected by the stratum to be detected after attenuation;
the first processing unit is used for amplifying and mixing the received two paths of received signal signals, converting the high-frequency component into the low-frequency component and obtaining two paths of 5K sinusoidal signals;
the second processing unit is used for solving the resistivity corresponding to the two paths of 5K sinusoidal signals; taking the average value of the two resistivities, wherein the average value is the resistivity of the stratum to be measured.
The following are further optimizations and/or improvements to the above-described inventive solution:
the first processing unit comprises an antenna frequency selecting plate and an analog signal conditioning plate;
the antenna frequency selection plate is used for selecting frequencies of the first receiving signals and the second receiving signals received by the first receiving coil and the second receiving coil;
and the analog signal conditioning board amplifies and mixes the first receiving signal and the second receiving signal after frequency selection, converts the high-frequency component into the low-frequency component and obtains two paths of 5K sine signals.
The second processing unit is a receiving core board.
The transmitting end comprises a transmitting core plate, a transmitting matching plate, an antenna tuning plate and four transmitting coils;
the transmitting core board receives a 400K sine signal, a 2M sine signal and a synchronizing signal, and sequentially conducts four transmitting coils by utilizing the synchronizing signal;
transmitting a matching board, and performing power matching on the sinusoidal signal and a later stage;
the antenna tuning plate is used for selecting frequencies of sinusoidal signals after power matching;
four transmitting coils, which transmit two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the stratum to be tested.
The two receiving coils are positioned in the middle, and the four transmitting antennas are positioned at two sides of the receiving antennas and are symmetrically distributed.
According to the invention, two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals are transmitted to the stratum to be detected, and the resistivity of the stratum to be detected is obtained by receiving the two paths of receiving signals reflected back after the stratum to be detected is attenuated, so that the directional signals and the geological parameters are well combined, meanwhile, the acquisition of 2000KHz and 400KHz signals is simple, the calculated amount is small, the implementation process is not complex, the measurement efficiency of petroleum engineering is improved, and the technical support is provided for exploiting complex geological reservoirs.
Drawings
FIG. 1 is a flow chart of the method of example 1 of the present invention.
Fig. 2 is a flowchart of a method for transmitting signals in embodiment 1 of the present invention.
Fig. 3 is a schematic view of the device structure according to embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of a receiving end in embodiment 2 of the present invention.
Fig. 5 is a schematic structural diagram of an analog signal conditioning board in embodiment 2 of the present invention.
Fig. 6 is a schematic structural diagram of a transmitting end in embodiment 2 of the present invention.
Fig. 7 is a schematic structural view of a transmitting core plate in embodiment 2 of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
The invention is further described below with reference to examples and figures:
example 1: as shown in fig. 1, the embodiment of the invention discloses a signal acquisition and processing method for measuring the resistivity of electromagnetic waves while drilling, which comprises the following steps:
step S101, transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to a stratum to be tested;
here, the transmission signal of the preset frequency may be generated by frequency division through a crystal oscillator. In the embodiment, a 400K sinusoidal signal and a 2M sinusoidal signal are selected, and the amplitude attenuation and the phase offset of the signals with the two frequencies are mainly related to the resistivity of the stratum, so that the geosteering and the stratum evaluation can be facilitated;
step S102, receiving two paths of received signals reflected by the stratum to be detected after attenuation, wherein the two paths of received signals are a first received signal and a second received signal respectively;
step S103, amplifying and mixing the received two paths of received signal signals, and converting a high-frequency component into a low-frequency component to obtain two paths of 5K sinusoidal signals;
step S104, obtaining the resistivity corresponding to two paths of 5K sinusoidal signals; the formation resistivity can be obtained by inversion by combining a formation resistivity chart;
step S105, taking an average value of the two resistivities, wherein the average value is the resistivity of the stratum to be tested.
The invention discloses a signal acquisition and processing method for measuring the resistivity of electromagnetic waves while drilling, which is characterized in that two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals are transmitted to a stratum to be measured, and the resistivity of the stratum to be measured is obtained by receiving the two paths of receiving signals reflected back after the stratum to be measured is attenuated, so that a directional signal and geological parameters are well combined, the calculated amount is small, the implementation process is simple, the measurement efficiency of petroleum engineering is improved, and technical support is provided for exploiting complex geological reservoirs.
The following are further optimizations and/or improvements to the above-described inventive solution:
as shown in fig. 2, the transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the formation to be tested includes:
step S201, alternately generating a 400K sinusoidal signal, a 2M sinusoidal signal and a synchronous signal;
step S202, amplifying a 400K sinusoidal signal and a 2M sinusoidal signal;
step S203, sequentially conducting four transmitting coils by using a synchronizing signal;
and S204, performing power matching and frequency selection on the amplified 400K sinusoidal signals and 2M sinusoidal signals, and transmitting two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to a stratum to be tested by four transmitting coils.
Example 2: as shown in fig. 3 and 4, the embodiment of the invention discloses a signal acquisition and processing device for measuring the resistivity of electromagnetic waves while drilling, which is characterized by comprising a transmitting end and a receiving end; the receiving end comprises a first receiving coil, a second receiving coil, a first processing unit and a second processing unit;
the transmitting end transmits two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the stratum to be tested;
the first receiving coil receives a first receiving signal reflected by the stratum to be detected after attenuation;
the second receiving coil receives a second receiving signal reflected by the stratum to be detected after attenuation;
the first processing unit is used for amplifying and mixing the received two paths of received signal signals, converting the high-frequency component into the low-frequency component and obtaining two paths of 5K sinusoidal signals;
the second processing unit is used for solving the resistivity corresponding to the two paths of 5K sinusoidal signals; taking an average value of the two resistivities, wherein the average value is the resistivity of the stratum to be measured; the second processing unit is here a receiving core board.
The following are further optimizations and/or improvements to the above-described inventive solution:
as shown in fig. 4, the first processing unit includes an antenna frequency selecting board and an analog signal conditioning board;
the antenna frequency selection plate is used for selecting frequencies of the first receiving signals and the second receiving signals received by the first receiving coil and the second receiving coil; the antenna frequency selection plate comprises two paths of frequency selection circuits, so that the resistivity data is ensured not to be interfered.
And the analog signal conditioning board amplifies and mixes the first receiving signal and the second receiving signal after frequency selection, converts the high-frequency component into the low-frequency component and obtains two paths of 5K sine signals. The analog signal conditioning board is shown in fig. 5, and the amplification mixing processing is realized.
As shown in fig. 6, the transmitting end comprises a transmitting core board, a transmitting matching board, an antenna tuning board and four transmitting coils;
the transmitting core board receives a 400K sine signal, a 2M sine signal and a synchronizing signal, and sequentially conducts four transmitting coils by utilizing the synchronizing signal; the transmitting core board is shown in fig. 7, and is used for receiving and amplifying 400K sine signals, 2M sine signals and synchronous signals.
Transmitting a matching board, and performing power matching on the sinusoidal signal and a later stage; four power matching transformers are arranged on the transmitting matching board, the amplitude of a transmitting signal can be changed by adjusting the bundling ratio of the transformers, and the transmitting signal is coupled to a transmitting antenna through the transformers.
The antenna tuning plate is used for selecting frequencies of sinusoidal signals after power matching; the antenna tuning plate here comprises four antenna tuning modules, which are arranged on each transmitting coil respectively, and each antenna tuning module comprises 4 groups of capacitors and inductors.
Four transmitting coils, which transmit two paths of 400K sinusoidal signals and two paths of 2M sinusoidal signals to the stratum to be tested.
According to the requirement, the two receiving coils are positioned in the middle, and the four transmitting antennas are positioned at two sides of the receiving antennas and are symmetrically distributed.
The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (10)
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| CN202111366366.7A CN116136171A (en) | 2021-11-18 | 2021-11-18 | Signal acquisition and processing method and device for measuring resistivity of electromagnetic waves while drilling |
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| CN202111366366.7A CN116136171A (en) | 2021-11-18 | 2021-11-18 | Signal acquisition and processing method and device for measuring resistivity of electromagnetic waves while drilling |
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2021
- 2021-11-18 CN CN202111366366.7A patent/CN116136171A/en active Pending
Patent Citations (6)
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| CN102704921A (en) * | 2012-05-28 | 2012-10-03 | 中国石油天然气集团公司 | Measuring device for electrical resistivity of electromagnetic waves while drilling and measuring method thereof |
| CN104727812A (en) * | 2013-12-24 | 2015-06-24 | 中国石油化工集团公司 | Measuring set and method of while-drilling azimuthal electromagnetic valve resistivity |
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| CN205422701U (en) * | 2016-03-16 | 2016-08-03 | 北京波特光盛石油技术有限公司 | Multifrequency is along with boring electromagnetic wave resistivity logging appearance circuit system |
| US20170285213A1 (en) * | 2016-03-31 | 2017-10-05 | Pulse Directional Technologies Inc. | Tuned probe style propagation resistivity tool |
| CN108019207A (en) * | 2017-12-15 | 2018-05-11 | 北京六合伟业科技股份有限公司 | A kind of measuring method of SYMMETRIC ELECTROMAGNETIC ripple resistivity |
Non-Patent Citations (1)
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