RETAINING DEVICE INSERTED INTO CENTRAL CHANNEL OF PIPE COMPONENT OF DRILLING STRING AND APPROPRIATE PIPE COMPONENT OF DRILLING STRING Russian patent published in 2013 - IPC E21B17/00 E21B47/12 

FIELD: mining.

SUBSTANCE: retaining device (13) inserted into a central channel of a drilling string component. The channel has the first diameter on at least a part of the central section of the drilling string component, and the second diameter near the ends of the drilling string component. The second diameter is less than the first diameter. The retaining device (13) comprises a lengthy body (14), forming at least partially a jacket for a transfer line. The lengthy body (14) has transverse dimensions less than the second diameter. Multiple arc elements (15) are arranged along the lengthy body (14). Arc elements are separate from the lengthy body and are attached to it.

EFFECT: arc elements are elastically bending for provision of their displacement through the second diameter and have the largest chord that is more than the first diameter in free condition for creation of an opportunity of expansion in the first diameter after stretching via the second diameter.

3 cl, 9 dwg