초록 ▼

A downhole tractor is provided that includes a housing and a first wheel assembly coupled to the housing that is operable to translate away from the housing in a first direction. The first wheel assembly has a first electric motor, a first wheel, and a first reduction gear assembly coupled between t

A downhole tractor is provided that includes a housing and a first wheel assembly coupled to the housing that is operable to translate away from the housing in a first direction. The first wheel assembly has a first electric motor, a first wheel, and a first reduction gear assembly coupled between the first electric motor and the first wheel. A second wheel assembly is coupled to the housing and is operable to translate away from the housing in a second direction that is opposite to the first direction. The second wheel assembly has a second electric motor, a second wheel, and a second reduction gear assembly coupled between the second electric motor and the second wheel. A fluid ram is coupled to the first and second wheel assemblies for selectively translating the first and second wheel assemblies toward and away from the housing. A first controller is provided for controlling the flow of current to the first and second electric motors. On-board and surface control systems may be incorporated to permit selective active of the wheels assemblies. In addition, couplings and connectors employing shape-memory materials may be included to secure the tractor to coiled tubing or a wireline.

대표청구항 ▼

[ What is claimed is:] [1.]1. A downhole tractor, comprising:a housing;a first wheel assembly coupled to the housing and being operable to translate away from the housing in a first direction, the first wheel assembly having a first electric motor and a first wheel coupled to the first electric moto

[ What is claimed is:] [1.]1. A downhole tractor, comprising:a housing;a first wheel assembly coupled to the housing and being operable to translate away from the housing in a first direction, the first wheel assembly having a first electric motor and a first wheel coupled to the first electric motor;a second wheel assembly coupled to the housing and being operable to translate away from the housing in a second direction that is opposite to the first direction, the second wheel assembly having a second electric motor and a second wheel coupled to the second electric motor; andmeans for selectively translating the first and second wheel assemblies toward and away from the housing.