Well deflection and position gamma measuring nistrument during drilling

Abstract

The invention is direction and position drill-following survey apparatus comprising a drill collar, two V slots, metal shielding layer, tow gamma sensor, three-axis acceleration sensor, signal processing circuit module, high pressure sealing cover board, boring liquor conducting channel, upper slip ring connector, lower slip ring connector, wire hole. The invention integrated gamma survey and directional survey in just a short section which enables the drill not only survey the rock properties real-timely, but also tell the upper and lower rock characteristics when boring well., so to effectively find out the upper cover layer of the storage layer and seize the best timing entering the oil storage layer. Moreover, meanwhile assorting the upper and lower rock properties, the direction and drill status also can be obtained without any delay, which, facilitating adjusting the well boring track according to the geographic data and manage the drill travels a best track underground among the oil storage. The invention is suitable for geological guiding in fossil engineering.

Description

Technical field: [0001] The invention relates to a wireless measuring-while-drilling instrument used for geosteering in petroleum drilling engineering. Background technique: [0002] At present, in the field of measurement-while-drilling in the drilling industry, the known formation lithology identification method is to determine the formation lithology by measuring the gamma rays emitted by the formation rocks according to the different natural radioactive intensities of different formation lithologies. Natural gamma ray logging methods and instruments have been widely used in wireline logging engineering. In terms of the measurement principle of formation lithology, the measurement-while-drilling method is consistent with the wireline logging method, but there are great differences in the instrument structure, noise processing, signal extraction and technical implementation. The measurement-while-drilling instrument is greatly affected by the drill collar . The natural g...

AI Technical Summary

Problems solved by technology

But at present, the natural gamma ray measuring instrument while drilling is usually installed behind the sub-sections of other logging-while-drilling instruments (such as measuring sub-sections of resistivity while drilling, density while drilling, and neutron while drilling) to form a logging-while-drilling instrument. The connection of the geological parameter measuring instrument at the lower part of the directional measurement sub-section increases the length of the entire LWD instrument, and the distance between the inclination measuring point and the gamma measuring point is relatively long (generally greater than 3 meters). At the same time, the well deviation at this point cannot be obtained in time, resulting in a lag in the control of the wellbore trajectory, unable to capture the cap rock information on the top of the reservoir in time, and losing the best time to enter the oil and gas layer

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