Lost Circulation Material
Redefining Cementing in Loss Zones
Lost Circulation Solutions
Engineered Lost Circulation Solutions to Successfully Overcome Losses
Circulation losses are common in vugular or cavernous formations but occur most often in zones that are highly fractured or loosely consolidated. These zones can be hydraulically parted under relatively low hydrostatic pressures. The likelihood of lost circulation can be assessed using three key factors:
- The fracture pressure of the formation,
- The placement pressures during cementing operations (ECD),
- The characteristics of the loss zone.
By understanding these variables, we can identify solutions by addressing one or more of them.
- Enhancing the formation's fracture resistance: This involves using sealing-type preflushes or bridging agents to strengthen the formation.
- Lowering cement placement pressures: This can be achieved by reducing the slurry density and viscosity, minimizing both dynamic and static pressures during the operation.
Mitigate Lost Circulation Materials
Lost-Circulation Control Materials
For prevent potential losses during cement placement, DOSAS offers bridging materials and sealing-type preflushes.
The Type of Loss Zone and Lost Circulation Additive Selection
Lost circulation zones can be classified into various types, including unconsolidated sands, cavernous and vugular zones (such as limestone and dolomites), depleted formations, induced fractures, and natural fractures or faults. The severity of losses is categorized as follows:
seepage losses (<10 bbl/hr),
partial to severe losses (10–100 bbl/hr),
and total losses (>100 bbl/hr).
For tailored solutions to address specific loss-circulation challenges, contact DOSAS experts to design an effective lost-circulation job based on the severity and type of loss zone.