Two-way Locking Mechanism Design for Telescopic Downhole Tractors

doi:10.11885/j.issn.1674-5086.2016.12.24.01

Abstract

Abstract: Design of a two-way locking mechanism for telescopic downhole tractors, based on the principles of self-locking ramps, is reported to improve the traction capacity of telescopic downhole tractors. The proposed mechanism allows the tractor to lock itself to shaft linings in its fore and aft structure, thereby overcoming restrictions in traction force imposed by static frictional forces. This allows the tractor to be towed in both directions while also improving its traction capacity. The twoway lock comprises two locking states:the traction lock and reset lock. Through static-force analyses of both locking states, mathematical relations describing the two-way locking mechanism, when it meets the required locking conditions, were derived. Parametric design of the two-way locking mechanism was performed to ensure that the traction locking state is a self-locking state while the reset locking state is not. Subsequently, a computational model was established to simulate the dynamics of a tractor's frontal working section, thereby completing simulation of two-way locking processes. Results of these simulations have been used to validate the accuracy of the parametric design of the two-way locking mechanism, and the viability of the proposed mechanism has been proven.

Key words: telescopic downhole tractor, two-way locking mechanism, self-locking, traction force, traction capacity

CLC Number:

TE931

LIU Qingyou, ZHENG Wei, YANG Yaqiang, ZHANG Shuyang, ZHU Haiyan. Two-way Locking Mechanism Design for Telescopic Downhole Tractors[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 1-10.

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