Patent ID: 9567812
Date: 2017-02-14
CPC Classifications: E21B

Claim:
1. An impact dissipation system for a downhole toolstring, wherein the system comprises: a housing; a carriage located within the housing, wherein the carriage is configured to move relative to the housing upon a predetermined impact force; and a dissipator disposed inside the housing between the carriage and an end of the housing, wherein the dissipator is configured to at least partially plastically deform when the carriage moves relative to the housing, wherein the carriage is configured to contact the dissipator and cause the dissipator to compress as the carriage moves within the housing, wherein the carriage is coupled to a base by a line passing internally through the dissipator, wherein the base comprises a landing ring that is part of a landing ring sleeve telescopically received within a drop-off tool and the carriage can be coupled to the downhole toolstring by a line passing through the dissipator.