Abstract: Downhole plug assemblies comprising plug, release sleeve and collet adapter and methods thereof are disclosed. The plug comprises of a mandrel with a bore and an outer subassembly comprising a top element, anchoring system, sealing system and a nose element. The release sleeve is engaged and secured within the bore at a proximal portion by a plurality of shearable fastening members. The collet adapter comprises of a plurality of fingers with each finger ending in a head at the tip. The collet head is engaged with a slanting face of the release sleeve at a lower end and is configured to be engaged with a setting tool at an upper end. During the release process, the fingers expand to prevent disengaging from the face thus transferring the load to the release sleeve and causing the fastening members to shear off and the release sleeve to release from the mandrel.

Abstract: Downhole plugs having single anchoring mechanisms and methods thereof are disclosed. The plug comprises of inner mandrel with proximal portion and distal portion, outer assembly and one or more retaining members. The outer assembly comprises of support element, elastomeric element for sealing the gap between the plug and casing, anchoring mechanism at the distal portion for anchoring the plug to the casing and nose element. The elastomeric element is retained in a compressed state at the downhole end by the anchoring mechanism and at the up hole end by the retaining members. In some embodiments, the retaining members are snap rings that are pushed down from step portions at the proximal portion when the plug is mobilized to a set position thereby retaining the elastomeric element. In some embodiments, the retaining members are ratcheted open rings that ratchet over the proximal portion thus retaining the elastomeric element.

Abstract: Downhole tool assemblies having mule shoe members housed within UBHO sub members being secured by fastening members and methods thereof are disclosed. A lower portion of the mule shoe member has many apertures disposed circumferentially around an external surface that are aligned with openings present in the UBHO sub member to achieve a specified orientation. Fastening members releasably engage and couple the apertures with the openings thereby securely locking the mule shoe member within the UBHO sub member in the specified orientation. Set screws having an elongated dowel member protruding from a centre of a face at a bottom end are disclosed. The dowel member is coaxial with the body of the screw having a lesser width and is configured for being substantially seated within a receiving member for providing a positive lock.