CABLE ADAPTER SUB Russian patent published in 2005 - IPC

FIELD: drilling equipment, particularly cable television system used to perform navigational control of directional and horizontal oil and gas well drilling from ground surface and to guide borehole cable rope from inner cavity out of drilling string.

SUBSTANCE: sub comprises threaded connection pipe with thrust end, body with straight and peripheral inclined channels, bush and annular sealing member arranged in straight body channel. Straight body channel is central and provided with cup with inner and outer longitudinal grooves. The bush is installed so that the bush may cooperate with thrust end of threaded connection pipe and has longitudinal extensions arranged in inner longitudinal cup grooves. Annular sealing member comprises extension having orifice and cut for cable introduction into the orifice. The extension is arranged in peripheral inclined channel of the body. Safety means formed as reinforcing member facing straight channel and as elastic member with orifice and cut for cable introduction and arrangement is installed at inclined channel inlet.

EFFECT: increased service life, ease of sub operation and repair.

3 cl, 4 dwg