Patent ID: 8881830
Filing Date: 2014-11-11
Classification: E21B

Abstract:
1. A riser pipe section for offshore well drilling operations, comprising a main tube element including an extension with a male connector element and a female connector element comprising: first tenons, at least one auxiliary tube element secured to the male connector element and to the female connector element so that the main tube and the at least one auxiliary tube element jointly transmit tensile stresses between the male connector element and the female connector element, and wherein a locking ring is mounted on the male connector element such that the locking ring will be positioned between a female connector element of an adjacent riser pipe section and the male connector element, with the locking ring comprising second tenons interacting with first tenons of the female connector element of the adjacent riser pipe section for locking the female connector element of the adjacent riser pipe section and the male connector element together, wherein the first tenons are positioned on an inner surface of the female connector element and the second tenons are positioned on an outer surface of the locking ring.