FIELD: mining.
SUBSTANCE: invention relates to means orientation of direction of offshoots sidetracking from open-well horizontal part. Proposed device for orientation of direction of sidetracking from open-well horizontal part contains bottom-hole telemetric system – BTS – with wireless electromagnetic communication channel, lowered in the well on the pipe string, including sensor control module, transmitting module, as well as a receiving device and a personal computer located at the wellhead. Besides, device in direction from BTS to pipe string is successively equipped with spiral drill collar (DC), wedge-deflector with inclined working surface with angle of 4–6° with respect to the axis of the horizontal part of the uncased well, with a safe sub, wherein the ratio of the outer diameter of the spiral DC to the diameter of the horizontal wellbore is 0.9:1, and the outer diameters of the wedge and spiral DC are equal to each other. Device are placed in the range of the greatest set of curvature, but not more than 6° per 10 m.
EFFECT: disclosed device for orientation of direction of sidetracking from horizontal part of open well allows to: increase accuracy of orientation direction of cutting working surface of wedge-deflector relative to azimuth of horizontal part of uncased well; reducing the probability of attachment clamping in the horizontal part of the well when drilling the offshoot; to extract pipe string by flap with sticking BTS; reduce metal consumption and weight of BTS structure.
1 cl, 3 dwg
