FIELD: physics.
SUBSTANCE: system comprises the first well having a drill string with a drill string and a target well remote from the first well. The drill string has the first diameter and the second portion with an additional body having a diameter that is larger than the first diameter. A plurality of sensors comprising pairs of sensors located in the second portion near the outer radial surface of the second part, in the plane x/y, which is perpendicular to the longitudinal axis of the extension housing. Additional housing for sensors includes many blades. Each blade contains one sensor located in it near the outer radial surface of the blade. The processor has a post with a drill, and the processor determines the distance and direction to the target of the well by, at least, one measure of the gradient based on, at least, partially, pair output sensors.
EFFECT: improving the accuracy of ranging operations.
18 cl, 9 dwg
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