Method for improving electromagnetic wave resistivity measurement precision and expanding measurement range thereof
A technology of measurement range and measurement accuracy, used in electromagnetic wave detection, electrical/magnetic detection for logging records, etc. Accuracy, improved effect of extended resistivity measurement range
Active Publication Date: 2011-08-31
BC P INC CHINA NAT PETROLEUM CORP +2
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The reason why the compensation process can eliminate these drifts is based on the assumption that these changes are in the product relationship with the formation induced electromotive force, but the mutual inductance signal, the circuit zero signal and the base value signal of the antenna system are not in the product relationship with the formation induced electromotive force, so the The compensation process cannot eliminate the mutual inductance signal, the circuit null signal and the base value signal of the antenna system
As a result, the measurement accuracy of amplitude attenuation resistivity and phase difference resistivity is low, and the dynamic range is small
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[0045] The fixed subcritical pressure steam injection boiler proposed by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0046] The method for improving the measurement accuracy of electromagnetic wave resistivity and expanding the dynamic range of resistivity measurement and the steps thereof will be described in detail below with reference to the accompanying drawings.
[0047] exist figure 1 , shows the antenna system EMWR-T3R2 composed of three transmitting antennas and two receiving antennas, where T1, T2, T3 are transmitting antennas, R1 and R2 are receiving antennas, and T2, T3 are about the receiving antennas R1 and R2 symmetrical about the midpoint. exist figure 2 In, the amplitude attenuation that contains the mutual inductance signal is shown to formation resistivity conversion relation, wherein Attenuation is the amplitude attenuation, the unit is dB, Rt is the formation resistivity, the unit is ohm. That...
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The invention provides a method for improving electromagnetic wave resistivity measurement precision and expanding resistivity measurement range, which eliminates mutual induction electromotive force, zero signals of a circuit and base signals of an antenna system which are not related to formation resistivity from actual well logging voltage signals through the calculation of the mutual induction electromotive force between a transmitting antenna and a receiving antenna, the calculation of an amplitude attenuation-resistivity conversion plate which eliminates the mutual induction electromotive force and a phase difference-resistivity conversion plate and the measurement of the base signals of the antenna system and the zero signals of the instrument circuit, further calculates the phase difference and the amplitude attenuation and carries out the amplitude attenuation / phase difference-formation resistivity conversion by using the amplitude attenuation-resistivity conversion plate which eliminates the mutual induction electromotive force and the phase difference-resistivity conversion plate. The method can improve the electromagnetic wave resistivity measurement precision and expand the dynamic range of the resistivity measurement, and the effect to the amplitude attenuation resistivity measurement is even more obvious.
Description
technical field [0001] The invention belongs to a data processing method in the field of oil and gas drilling, and relates to an electromagnetic wave resistivity measurement method for detecting formation resistivity characteristics, in particular to a method for improving the measurement accuracy of electromagnetic wave resistivity and expanding its measurement range. Background technique [0002] Since the introduction of electromagnetic wave resistivity measurement technology, it has been widely used. Initially, the electromagnetic wave measurement technology only uses the phase difference to obtain the formation resistivity, and the commonly used transmission frequency is 2MHz. Later, because the detection depth of the formation resistivity reflected by the phase difference was shallow, the amplitude attenuation of the 2MHz electromagnetic wave was also used to obtain the formation resistivity at the same time to obtain a deeper detection depth. In order to further impr...
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IPC IPC(8): G01V3/30
Inventor 苏义脑朱军盛利民邓乐李会银
Owner BC P INC CHINA NAT PETROLEUM CORP