valve to initiate inflation. A large internal diameter allows high-rate fluid treatments. A 21


-in. CoilFLATE ST straddle tool version for stimulation applications uses the same princi- ples as the CoilFLATE HPHT packer.


⁄ 8


CoilFLATE HPHT packers can isolate wellbore sections for pressure testing, temporary zonal iso- lation and permanent abandonment. These chemically resistant systems can also be used for


sand consolidation, acidizing and fracturing, as permanent and retrievable bridge plugs for water and gas shutoff, and as a cement retainer or packer for through-tubing gravel packing.


Straddle bypass


Top pressure element


Treatment sub


Bottom pressure element


Flowback- control element


Straddle bypass


Multicycle dump valve


Straddle sections


Dump port


> Selective stimulation with dual-seal straddle isolation tools. The OptiSTIM ST straddle packer for coiled tubing or jointed pipe comprises a straddle bypass, a straddle extension assembly with ported treatment sub and a multicycle dump valve. This con guration facilitates effective sequential placement of chemical, acid or proppant fracture treatments.


> In atable packer expansion. Heavy-duty tapered slats, a high-strength carcass restraint system (CRS), a composite in ation bladder and a chemically resistant elastomer anchor CoilFLATE HPHT packers in place and provide a high- pressure seal even at large expansion ratios— 2 to 1 at 5,000 psi [34.5 MPa] and 3 to 1 at 2,000 psi [13.7 MPa]. These packers withstand extended exposure at temperatures up to 375° F [191° C] in almost any chemical environment.


Spring 2004 49


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