Accessing unconventional resources with shale fracturing
Firstly, shale fracturing requires high pressure to stimulate the formation (Shale). Depth, deviation, temperature, high pressure are common obstacles that cementing operations and swellable packers can barely overcome.
Then, Operators have tested different fracturing methods and fluids to find the optimal fracturing method and fluid. However, since the late 2000s, two trending shale fracturing methods prevail in shale fracturing.
- PnP – Plug and Perf.
- Ball-and-seat – Open hole ball drop multi-stage fracturing.
Saltel Xpandable* expandable steel FracPacker has its use in the second fracturing technique. This Openhole Multi-Stage shale fracturing system allows efficient and controlled stimulation operations in difficult well conditions (Up to 160 degC/320 degF). In such configuration, there is no risk for the production casing of uncertain cementing. Once activated, the FracPackers guarantee perfect isolation of each zone, which can be successively stimulated. Saltel Isolation Packers can also be used to isolate screens or pre-perforated casings. Either putting the well on pressure or using a straddle tool can successively expand the packers and stimulate the targetted zones.
Open Hole Ball-Drop Multi-Stage Fracturing
Provide immediate efficient seal, whatever the fluids or the temperature cycles* Challenge Openhole isolation is challenging, especially with irregular borehole geometries. With the high flow rates used during hydraulic stimulation,…