Testing Tool Conveyed by Coiled Tubing Enables Multiple Tasks in One Run

Some well-testing operations are executed by performing multiple runs in hole using slickline and coiled tubing (CT). A technology has been developed that combines many of these operations, including contingency stimulation activities, into one run. The complete paper introduces the major system components and reviews challenges associated with design, manufacture, and testing.

Developing and Qualification Testing of the Tool

Before engaging in the tool-development process, the following major operational requirements were identified and confirmed:

• Reduce the number of different services required and their associated rigup and rigdown times by maximizing the work scope performed with CT
• Increase timely access to high-quality data for rapid onsite decision making during well testing by converting from memory-based gauges and time-activated downhole shut-in tools to real-time control and data transmission to surface
• Maximize operational efficiency during well testing by having real-time data transmission to surface
• Introduce on-demand, selective stimulation capability while the tool and CT remain downhole
• Allow multiple testing periods during one trip in hole when required at different depths
• Increase the effectiveness of transferring the well from underbalanced to overbalanced status or vice versa by changing out fluids in the well or pumping nitrogen through the CT
• Reduce overall risk of stuck pipe or stuck tools during well testing by always having circulation available above the packer module

Following multiple design iterations, two complete prototype tools were manufactured and module-level function testing was performed. In parallel, software development and testing of the graphical user interface commenced.