Measuring device for ultra-deep resistivity

Abstract

The invention discloses a measuring device for ultra-deep resistivity. A transmitting control and power amplifier module selects a D-type power amplifier with high efficiency, and outputs a high-powersine wave transmitting signal of 1KHz to dozens of KHz according to the need; the signal excites a periodic electromagnetic wave signal in a stratum through a transmitting antenna; the measuring device transmits a synchronous pulse every time transmitting a measuring period, so that each receiving module is triggered to collect the signal output by a receiving antenna; meanwhile, after being superposed, the sampled data is transmitted to a measurement control module in a signal modulation communication form through a single-core cable; a DSP main controller performs DPSD digital phase-sensitive detection conversion on each receiving channel signal to obtain the signal amplitude ratio and the phase difference of each receiving channel; and finally, a stratum resistivity result is inverted.The single-core cable also serves as a communication carrier while transmitting a power supply, the modules are in communication connection in a signal modulation communication form, and meanwhile, the synchronous pulse is also transmitted through the single-core cable.

Description

technical field [0001] The invention relates to the technical field of resistivity logging, in particular to an ultra-deep resistivity measuring device. Background technique [0002] In recent years, with the rapid development of logging technology, various LWD tools have emerged in an endless stream, and the measurement accuracy and detection depth have also been continuously enhanced. On this basis, the resistivity measurement while drilling has also been applied to a certain extent. On the basis of resistivity measurement, the detection depth is increased, and the position and storage capacity of the oil layer can be predicted in advance while drilling, and the drilling of the oil layer can be avoided. It is also possible to measure natural gamma ray, Resistivity, near-bit, well deviation, borehole and other collective parameters, ground geology and drilling personnel can conduct geosteering with high time efficiency and low cost on the basis of analyzing these data. The...

AI Technical Summary

Problems solved by technology

The detection depth of the side of the conventional azimuth logging while drilling tool is difficult to exceed 10 meters, so when dealing with complex and special underground oil layers, especially vertical well detection, if there are some measurement errors during the drilling process, it may cause the borehole wall Too close to the oil and water layer, causing collapse or oil and water leakage, making the oil well invalid, the drilling success falling short, and heavy losses

Because conventional azimuth logging while drilling tools may be able to detect oil layer boundaries in time when measuring horizontal wells or deviated wells, but once encountering vertical well detection, due to the limited forward detection depth parallel to the longitudinal direction of the tool bit, it cannot be detected in time. When the geological layered structure is found, it may be too late to turn the direction of the drill bit when it encounters an oil-water layer, resulting in drilling through the oil layer

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