ABSTRACT:

A novel procedure has been applied in the field to run externally flush jointed tubing (FJT) to a depth of over 3,000 metres into live wells with significant surface pressures using conventional coiled tubing equipment. The procedure represents a new way of using conventional coiled tubing equipment. It avoids the use of a rig or a workover/snubbing unit. The procedure is therefore cheap and efficient. The technique is capable of running complex tubing strings with different diameters and sub-assemblies. Currently there are some limitations to the technique, notably the minimum and maximum diameter of tubing is 2-3/8" and 3-1/2" and the maximum pull and push is 100,000 lbs and 40,000 lbs respectively. In time these limitations should be extended without intrinsically changing the methodology. Safety considerations involve retaining a standard two barrier philosophy at all times during operations. There are numerous possible applications for the technique but to date it has been used to run insert (velocity) strings as a way of enhancing well production. It is particularly appropriate in corrosive environments requiring chrome tubing which is not suitable for coiled tubing with steel specifications that are currently available. The paper examines some case histories of operations in the field including running a complex insert string.

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