RIASSUNTO
Abstract
This paper presents three case histories that demonstrate the successful useof coiled tubing (CT) to convey tubing-conveyed perforating (TCP) guns underdiverse well conditions and applications. The deployment of this type of gunwith coiled tubing is commonly referred to as CTCP.
The three different well configurations perforated with the CTCP include anextended reach, intermediate pressure (>3,000 psi WHP) live gas wellwith slotted liner; a horizontal openhole oil producer; and one well in which adownhole fish had to be bypassed to reach the perforating interval. The paperdiscusses coiled tubing equipment selection, both surface and downhole, TCPequipment selection including gun size and firing head choice. Depth control isidentified as a critical task in the process and is discussed in detail.
The paper concludes that CTCP technology can be applied successfully to awide range of operations and well conditions.
Introduction
Coiled tubing-conveyed perforating has become a powerful tool in theproduction engineer's through-tubing perforating arsenal. This process enablesperforation of highly deviated, extended-reach and horizontal wells andprovides the operator with the flexibility to spot fluids or createunderbalance with nitrogen or a lighter fluid prior to perforating the well. Inone application described in this paper, the operator used CTCP to bypasscertain obstructions in the wellbore to reach the desired perforating depth.The type of CT equipment used to convey TCP is dependent upon well conditions.A discussion of these factors, types of TCP, and CTCP-related equipment ispresented in this paper.
CT Equipment Selection
Four main well parameters govern the selection of CT equipment and tubingsize (string design) for a particular perforating application; minimum wellboreinside diameter (ID), perforating depth, expected wellhead pressure, andwellbore geometry.