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  • Entering multilateral wells using coiled tubing


    R. Proctor, R. Grant, A. Marron and D. Cubas

    Openhole, horizontal multilaterals have proven cost-effective to drill, delivering high-rate wells in the short term. However, longer term, as production declines and the watercut increases in the well, intervention operations are required including water conformance, stimulation, production logging and water shutoff. Openhole, horizontal multilaterals are not designed for interventions into the laterals. The intervention method requires a drilling or workover rig to pull the completion and then use jointed pipe to guide the tools into the desired lateral. High rig rates, long workover times, limited rig availability, operational risks and the high potential for formation damage make workovers costly. Alternatively, well interventions could be done using Coiled Tubing (CT), a cheaper method than jointed pipe. For CT to enter all the laterals, a lateral entry guidance system is required, since CT has no inherent steering capability. Entering openhole multilateral wells is not simple. The problem was considered with respect to tool string complexity.

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