Patent ID: 6843317

Claim:
An autonomous downhole system for operating a well tool proximate a predetermined location in a wellbore, comprising: a. a tool string having at least one well tool for performing a well operation in the wellbore; b. a motive device in the tool string causing the tool string to traverse the wellbore; and c. a control system in the tool string adapted to autonomously position said tool string proximate the predetermined location in the wellbore, wherein the control system comprises: i. a sensing system having at least one sensor for detecting at least one parameter of interest related to the wellbore and generating at least one signal in response thereto; ii. a processor system having a processor with a memory for storing, at the surface, at least one well log therein, said processor acting according to programmed instructions to compare said at least one sensor signal to said at least one stored well log to determine a tool string position in the wellbore, said processor system having circuits adapted to control said well tool and said motive device.