Conveyance Options for Pipe Recovery in a Stuck Drill Pipe Scenario in Horizontal Wells

Abstract

Recovery of stuck drill pipe is a challenge in deep horizontal wells. Typically, in a vertical or slightly deviated well, after attempts have been made for recovery of stuck drill pipe by working the pipe, the option to convey the pipe recovery tools with electric line is relatively simple due to gravity descent. However, in horizontal wells, the options to convey the recovery tools require electric line using tractor or pump-down techniques; alternatively, coiled tubing can be used for conveyance. Our study evaluates these three methods and compares the efficiency and effectiveness of these conveyance methodologies. The application of these solutions each have their own advantages and some disadvantages, especially as the access within the drill pipe can be limited due to the presence of various types of restrictions such as debris or the variable diameter inside the pipe, which usually has an "internal upset" on the connections. These restrictions combined with the potential nonexistence of circulation will affect the maximum reach for the conveyance methods to differing degrees. The ability to reach the target may be limited in extended reach wells and the target cutting depth may not be feasible with some conveyance options. The presence of radioactive sources in the drilling assembly may also complicate the pipe recovery operation. Three different conveyance options to perform the pipe recovery operation used on different operations in the Middle East are documented: e-line tractor, e-line pump-down, and coiled tubing conveyance. We compare the options and evaluate the results from the three conveyance methods for the pipe recovery tools to sever the stuck drill pipe. Each of the methodologies can be effective, and the ideal application depends on the existing downhole conditions present at the point the drill pipe becomes stuck.