External Casing Packers (ECP) are inflatable downhole tools installed on the outside diameter of a pup joint of casing or casing mandrel. The ECP includes an inflation control valve mechanism to inflate the element and create a seal between the casing mandrel and open hole or previously set casing string. ECP can inflate to greater than 2.5 times their run-in diameters. An ECP can be inflated by straddling the inflation port with a variety of packer setting tools or by simply applying pressure to the entire casing string. Common applications: • For multiple stage cementing in vertical wells External Casing Packers are placed below the stage tool to support the cement column while it cures. • To prevent annular gas migration, External Casing Packers above the gas source stop the migration and ensure the integrity of the cement job. • To separate horizontal wells into segments, slotted liner, screens and blank casing are selectively placed between ECP.

 

Advantages:

• External Casing Packers can be easily installed on the outside of the casing, eliminating the need for additional casing strings or complex installations. 

• ECPs can be inflated to a large diameter, providing a strong seal with the surrounding formation or previously set casing.

• ECPs can be used for multiple stage cementing, ensuring the integrity of each stage and preventing unwanted fluid movement between stages.

• By selectively placing ECPs, horizontal wells can be segmented and different zones can be selectively treated or produced, increasing well productivity.

• Larger, longer packer lengths are suitable for running through severe doglegs and high hole inclinations, providing application flexibility. 

• The packer includes a field-proven element system, providing consistent reliability.

• Shear pins in the valve system are easily accessible for field dressing and do not require special tools, contributing to efficiency and time savings.

• The valve sleeve contains a shoulder, protecting the valve from damage during run-in.

 

Stage Cementing Tools

TOMEX provides a range of stage cementing tools and accessories that can be used together with ECP for efficient cementing of a casing string or liner in multiple stages. These tools are typically run above the ECP to prevent cement from flowing downhole and leaving a lower section uncemented. Using compatible systems can significantly improve efficiency, reduce rig time, minimize risk exposure, enhance safety, and improve wellbore integrity.