CN203705661U - LWD resistivity measurement device utilizing high frequency magnetometer - Google Patents
LWD resistivity measurement device utilizing high frequency magnetometer Download PDFInfo
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- CN203705661U CN203705661U CN201320838005.2U CN201320838005U CN203705661U CN 203705661 U CN203705661 U CN 203705661U CN 201320838005 U CN201320838005 U CN 201320838005U CN 203705661 U CN203705661 U CN 203705661U
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Abstract
The utility model provides a LWD (Logging While Drilling) resistivity measurement device utilizing a high frequency magnetometer. The LWD resistivity measurement device comprises a cylindric tool main body. A first transmitter, a second transmitter, a first receiver and a second receiver are disposed on the tool main body. The first receiver and the second receiver are magnetometers. The first transmitter and the second transmitter respectively are coil antennas. The magnetometers correspondingly receive and measure magnetic field components which come from the transmitters. The sensitivity of the magnetometer is high, and each component of a magnetic field can be measured independently. The measurement data is high in precision and the later signal processing is convenient. In addition, the size of each magnetometer is smaller than that of a traditional coil antenna, and thus the LWD resistivity measurement device can be installed and used on a drilling tool conveniently.
Description
Technical Field
The utility model relates to a resistivity measurement while drilling technical field, more specifically, the utility model relates to a resistivity measurement while drilling device.
Background
It is well known for drilling applications (e.g., Logging While Drilling (LWD), Measurement While Drilling (MWD), wireline logging applications, etc.) to determine electrical properties of formations surrounding a borehole using electrical measurements, and the resistivity (or conductivity) measured by such drilling devices may be understood as utilizing various petrophysical models (e.g., Archie's Law) to determine the petrophysical properties of the formations and fluids therein. For example, the high resistivity of high porosity formations often indicates the presence of hydrocarbons, such as crude oil and natural gas, while the low resistivity of high porosity formations is often a water saturated zone. The terms resistivity and conductivity, although intentionally opposite, are often used interchangeably in the art, and reference to one or the other is for convenience of description and not intended to be limiting.
Conventionally, a propagation resistivity measuring device requires at least one pair of receivers and a pair of transmitters which transmit electromagnetic energy into the formation surrounding the borehole, the energy returning from the formation to the borehole being recorded by both receivers, the phase difference and signal attenuation of the signal as it propagates from the first receiver to the second receiver being obtained by processing the received signals, and the resistivity of the formation surrounding the borehole being obtained by inverse operation. The phase difference and signal attenuation between the two receivers is proportional to the frequency of the waves. On the other hand, the probe depth of the measuring device decreases with the increase in the measuring frequency, so that the radio wave frequency used by the propagation resistivity measuring device is from 100 khz to several mhz. High frequency magnetometers are becoming a reality with the rapid development of scientific technology (e.g., US2008/0106201, US 2010/0289491).
Prior patent application CN102460219 discloses a borehole compensated resistivity logging tool with asymmetric antenna spacing, the tool comprising first and second compensating transmitters preferably deployed so as to be axially symmetric between first and second spaced receivers, and a plurality of transmitters deployed so as to be axially asymmetric about said receivers, said compensating transmitters being configured to obtain borehole compensation which can be subtracted from conventional phase and attenuation measurements to obtain compensated phase and attenuation values, and the measured formation resistivity can be obtained by inverse operation. However, in the prior art, both the receiver and the transmitter adopt coil antennas, the sensitivity is not high, a plurality of components of a magnetic field cannot be measured independently, the measurement data precision is low, the later-stage signal processing is not convenient, and the size is large, so that the installation and the use on a drilling tool are not facilitated.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to solve the technical problem that the sensitivity of receiver among the resistivity measuring device improves reduces the size of receiver to propose one kind and utilize high frequency magnetometer along with boring resistivity measuring device.
In order to solve the technical problem, the utility model provides a following technical scheme:
a resistivity measurement while drilling device utilizing a high frequency magnetometer, comprising: the magnetic field component measuring device comprises a cylindrical tool body, wherein a first transmitter and a second transmitter, a first receiver and a second receiver are arranged on the tool body, the first receiver and the second receiver are respectively magnetometers, the first transmitter and the second transmitter are respectively coil antennas, and the magnetometers correspondingly receive and measure magnetic field components from the transmitters.
In the resistivity measurement while drilling device using the high-frequency magnetometer, the first transmitter and the second transmitter are symmetrically arranged relative to the midpoint of the first receiver and the second receiver.
According to the resistivity measurement while drilling device utilizing the high-frequency magnetometer, the first receiver and the second receiver respectively comprise a single magnetometer or a plurality of magnetometers.
The resistivity measurement while drilling device utilizes a high-frequency magnetometer which can work in a frequency band from a static field to a frequency as high as 10 MHz.
According to the resistivity measurement while drilling device utilizing the high-frequency magnetometer, the polarization direction of the electromagnetic signal transmitted by the coil antenna can be parallel to the axial direction of the tool body.
Compared with the prior art, the technical proposal of the utility model has the advantages that,
(1) utilize high frequency magnetometer to follow drilling resistivity measuring device, adopt the magnetometer as resistivity measuring device's receiver, compare with traditional coil antenna, every weight in magnetometer ability independent measurement magnetic field can simplify subsequent signal processing procedure to can improve the data accuracy, in addition, the size of magnetometer is littleer than the size of traditional coil antenna, so just has favorable to installing and using on the drilling tool.
(2) Utilize high frequency magnetometer to follow drilling resistivity measuring device, two transmitters are for the mid point symmetrical arrangement of two receivers, such structure can utilize the well compensation method, obtains the phase difference and the signal attenuation of having compensated the error, and then improves resistivity measurement's precision.
(3) Utilize high frequency magnetometer to follow drilling resistivity measuring device, can deploy two magnetometers in the resistivity measuring tool main part as the receiver, also can deploy a plurality of magnetometers and form the receiver array, can receive more credible formation information when deploying a plurality of magnetometers and form the receiver array, further improve the measurement accuracy of resistivity.
(4) Utilize high frequency magnetometer to follow boring resistivity measuring device, the magnetometer can work at the frequency band that the static field reaches the frequency up to 10 megahertz, generally propagate resistivity measuring device and all adopt radio wave (from 100 kilohertz to several megahertz), so the magnetometer can satisfy this operating frequency.
Drawings
In order to make the content of the invention more clearly understood, the invention will now be described in further detail with reference to specific embodiments thereof, in conjunction with the accompanying drawings, in which
FIG. 1 is a prior art resistivity measurement apparatus;
fig. 2 is an overall appearance diagram of a high-frequency magnetometer resistivity-while-drilling measuring device model 200 according to an embodiment of the present invention;
fig. 3 is a graph of phase difference versus formation resistivity between receivers in the resistivity measurement device model 200 according to an embodiment of the invention;
fig. 4 is a graph of signal attenuation versus formation resistivity for receivers in the resistivity measurement device model 200 according to one embodiment of the invention;
fig. 5 is an overall appearance diagram of a high-frequency magnetometer resistivity-while-drilling measuring device model 201 according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of the resistivity measurement device model 201 along AA' in accordance with one embodiment of the present invention.
The reference numbers in the figures denote: 200-resistivity measurement device model, 201-resistivity measurement device model, 202-transmitter, 204-transmitter, 206-receiver, 208-receiver, 302-phase difference, 304-signal attenuation, 210-magnetometer, 212-magnetometer.
Detailed Description
FIG. 1 depicts a resistivity measurement device model of the prior art.
Fig. 2 illustrates a resistivity measurement device model 200 according to an exemplary embodiment of the invention, which includes a cylindrical tool body, wherein a transmitter 202 and a transmitter 204, a receiver 206 and a receiver 208 are disposed on the tool body, the transmitter 202 and the transmitter 204 are symmetrically disposed with respect to a midpoint of the receiver 206 and the receiver 208, two z-directional coils are used as transmitting antennas of the transmitter 202 and the transmitter 204, the transmitter 202 and the transmitter 204 are by no means limited to the z-direction, the receiver 206 and the receiver 208 are magnetometers, respectively, prior patent 20080106261 discloses a newly developed magnetometer which can operate in a frequency band from a static field up to 10 mhz, can simultaneously and independently measure two or three vertical components of a magnetic field, and in this embodiment, the magnetometer receives the z-component of the magnetic field.
According to the apparatus of FIG. 2, transmitter 202 and transmitter 204 transmit electromagnetic signals into the formation in sequence, and receiver 206 and receiver 208 receive and measure the electromagnetic signals from transmitters 202 and 204, respectively. When transmitter 202 transmits an electromagnetic signal into the formation, the measured phase difference and signal attenuation between the two receivers may be expressed as
Wherein, isT1Representing the phase difference between receiver 206 and receiver 208 when transmitter 202 transmits a signal,andis the phase, Att, of the signal measured by each of the receivers 206 and 208 when the transmitter 202 transmits electromagnetic signals into the formationT1Representing the signal attenuation between receiver 206 and receiver 208 when transmitter 202 transmits a signal,andis the magnitude of the signal measured by each of the receivers 206 and 208 when the transmitter 202 transmits electromagnetic signals into the formation.
Similar measurements are made when transmitter 204 transmits electromagnetic signals into the formation, and the phase difference and signal attenuation between the signals measured by the two receivers can be expressed as:
wherein,representing the phase difference between receiver 206 and receiver 208 when transmitter 204 transmits a signal,andis the phase, Att, of the signal measured by each of the receivers 206 and 208 when the transmitter 204 transmits an electromagnetic signal into the formationT2Representing the signal attenuation between the receiver 206 and the receiver 208 when the transmitter 204 transmits a signal,andis the magnitude of the signal measured by each of receiver 206 and receiver 208 when transmitter 204 transmits an electromagnetic signal into the formation.
The phase difference compensated for errors can be derivedAnd error-compensated signal attenuation Attc：
FIG. 3 shows simulation results of model 200 of FIG. 2 with respect to a plot of phase difference between receivers 206 and 208 versus formation resistivity, FIG. 4 shows simulation results of model 200 of FIG. 2 with respect to a plot of signal attenuation between receivers 206 and 208 versus formation resistivity, and FIGS. 3 and 4 show that both phase difference 302 and signal attenuation 304 between receivers are monotonic functions with respect to formation resistivity, so that error-compensated phase difference is usedCalculating the formation resistivity according to the phase difference and resistivity relation curve chart or using the error-compensated signal attenuation AttcAccording to signal attenuationAnd subtracting the resistivity relation curve chart to obtain the formation resistivity.
Two magnetometers can be deployed on the resistivity measurement tool body as receivers, and a plurality of magnetometers can be deployed to form a receiver array. As shown in fig. 5, a resistivity measurement device model 201 in accordance with an exemplary embodiment of the invention employs a plurality of multicomponent magnetometers to form a receiver array deployed on a resistivity measurement tool body, with other devices consistent with fig. 2.
FIG. 6 shows a cross-sectional view of the resistivity measurement device model 201 of FIG. 5 along line AA', with three magnetometers 208, 210, 212 deployed in one section. Therefore, the receiver can receive more credible formation information, and the measurement accuracy of the resistivity is further improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (5)
1. A resistivity measurement while drilling device utilizing a high-frequency magnetometer is characterized by comprising: the magnetic field component measuring device comprises a cylindrical tool body, wherein a first transmitter and a second transmitter, a first receiver and a second receiver are arranged on the tool body, the first receiver and the second receiver are respectively magnetometers, the first transmitter and the second transmitter are respectively coil antennas, and the magnetometers correspondingly receive and measure magnetic field components from the transmitters.
2. The resistivity measurement while drilling device with the high frequency magnetometer of claim 1, wherein the first transmitter and the second transmitter are symmetrically disposed relative to a midpoint of the first receiver and the second receiver.
3. The resistivity measurement while drilling device with the high-frequency magnetometer of claim 1, wherein the first receiver and the second receiver respectively comprise a single magnetometer or a plurality of magnetometers.
4. The resistivity measurement while drilling device with the high-frequency magnetometer of claim 3, wherein the magnetometer can work in a frequency band from a static field to a frequency of up to 10 MHz.
5. The resistivity measurement while drilling device with the high-frequency magnetometer of claim 1, wherein the polarization direction of the electromagnetic signal transmitted by the coil antenna can be parallel to the axial direction of the tool body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320838005.2U CN203705661U (en) | 2013-12-18 | 2013-12-18 | LWD resistivity measurement device utilizing high frequency magnetometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320838005.2U CN203705661U (en) | 2013-12-18 | 2013-12-18 | LWD resistivity measurement device utilizing high frequency magnetometer |
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| CN203705661U true CN203705661U (en) | 2014-07-09 |
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| CN201320838005.2U Expired - Fee Related CN203705661U (en) | 2013-12-18 | 2013-12-18 | LWD resistivity measurement device utilizing high frequency magnetometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675925A (en) * | 2013-12-18 | 2014-03-26 | 贝兹维仪器(苏州)有限公司 | Resistivity measurement while drilling device and method by means of high-frequency magnetometers |
| CN106150488A (en) * | 2016-09-30 | 2016-11-23 | 上海神开石油设备有限公司 | LWD resistivity log method and azimuthal resistivity instrument thereof |
-
2013
- 2013-12-18 CN CN201320838005.2U patent/CN203705661U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675925A (en) * | 2013-12-18 | 2014-03-26 | 贝兹维仪器(苏州)有限公司 | Resistivity measurement while drilling device and method by means of high-frequency magnetometers |
| CN106150488A (en) * | 2016-09-30 | 2016-11-23 | 上海神开石油设备有限公司 | LWD resistivity log method and azimuthal resistivity instrument thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20171218 |