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Toe Sleeve use in Unconventional Reservoir


 

Toe Sleeve use in Unconventional Reservoir Related Terms

Toe Sleeve use in Unconventional Reservoir, DFIT, Frac Monitoring, Surface Pressure Transient Testing

A Toe Sleeve is a relatively simple tool that is run at the Toe of the Horizontal lateral to establish circulation for Stimulation purposes.  Most tools operate on absolute hydraulic pressure and have an internal sleeve that is "shear pinned" in place and designed to shear, sliding the internal sleeve downward exposing a set of ports to the annulus.

Although the use of sleeves and ball drops in the completion system (The Packers Plus System) is still developing and gaining usage in many unconventional areas, the use of toe sleeves is increasing at a faster rate.

Primary Advantages....

The use of the Toe sleeve prevents the need for running coiled tubing for perforating purposes which is a big time saver. 

Frictional loss issues can also be reduced because of the larger flow areas thru the sleeve ports.

Possible Disadvantages....

Toe sleeve won't open

Because of the move to the Toe sleeve by several large operators in unconventional plays across the country their procedures call for the toe sleeve to be opened approximately 10 to 14 days before the scheduled frac date so there is time to mobilize a CT unit to perf the zone should the sleeve not open.  This has happened on a few occasions which delayed Frac operations and led to the change in procedure.

The advantage to these new procedures is that it lends itself well to performing a DFIT (pre-frac, injection fall-off) upon opening of the sleeve.  With pressure on the well you can move right into breakdown, inject your volume and then shut the pumps down and close in the well to watch the fall-off.  There really is no viable reason NOT to perform a DFIT test under these circumstances as it is an opportunity to collect valuable frac/stress parameters and possibly reservoir characteristics.


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