Hydraulically driven tandem tractor assembly

摘要

A tractor assembly is provided for downhole advancement in a well. The assembly comprises an uphole tractor and a downhole tractor. Each tractor in turn comprises uphole and downhole housings to accommodate uphole and downhole anchors with the anchors configured for interchangeably engaging a wall of the well. Additionally, a hydraulically driven piston is disposed through each of the housings of each tractor for actuation of the engaging.

主权项

1. A tractor assembly for downhole advancement in a well, the assembly comprising:
an uphole tractor having first uphole and downhole sondes for interchangeably engaging a wall of the well; a downhole tractor adjacent said uphole tractor, said downhole tractor having second uphole and downhole sondes for interchangeably engaging a wall of the well; and a singular hydraulically driven piston disposed through each of the first uphole and downhole sondes and the second uphole and downhole sondes, the piston configured to actuate each of the sondes to engage with the wall of the well and to drive the advancement of the tractor.