| 摘要 |
A string of pipe is stored in a body of water for working over a subsea well. The string is stored in a substantially linear configuration having controlled curvatures along its length with radii that are not smaller than the minimum yielding radius of curvature of the pipe material. The string may be made up from individual segments of threaded pipe. One end of the string is inserted into the well using a pipe drive assembly connected with the wellhead. The opposite end of the string is connected to a line that extends to a surface facility. The string may be rested on the bottom of the sea or may be floated on the water surface or may be suspended with buoyancy devices in various orientations between the sea bottom and the water surface. The pipe string may be stored within a tubular sleeve or may be disposed directly in the seawater. When the pipe is substantially horizontally oriented, an arching guide is used to divert the working end of the string from its storage position to a substantially vertical position for insertion into the well. The drive and guide may be permanently associated with the well or may be portable for movement to another subsea well. The drive and guide may be mounted in a buoyancy-controlled assembly. A remotely operated vehicle (ROV) is used to assemble and move the guide, drive and pipe through the water. |
