Successful Application of a Specialized Drill-In Fluid in Horizontal Niagaran Reef Wells in the Michigan Basin
Technical case study | Saber Drilling Fluids | Disolv-Seal® technology
A proactive reservoir drill-in fluid engineered with Disolv-Seal® provided effective lost-circulation control throughout the horizontal reservoir intervals of Consumers Energy’s Ray 511 and Ray 510 wells. The system enabled both wells to maintain circulation and reach planned total depth while minimizing formation damage and preserving post-cleanup hydrocarbon deliverability.
Geological and Operational Context
The Niagaran pinnacle reef trend is a mature Silurian carbonate petroleum play in the Michigan Basin with a substantial exploration and production history. Niagaran reef reservoirs are highly heterogeneous, with porous and vuggy dolomite that can accept significant volumes of drilling fluid after exposure.
These characteristics can create serious drilling-fluid-management challenges. Loss of returns can interrupt drilling, impair cuttings transport, complicate hydraulics management, and increase time to total depth—especially in horizontal wells with long reservoir exposures.
Conventional lost-circulation strategies typically respond after losses occur. On a recent two-well pad, Saber implemented a proactive reservoir drill-in-fluid design intended to reduce fluid losses as the producing interval was drilled.
The Results
- Maintained circulation through horizontal reservoir intervals
- Both wells reached planned total depth
- Reduced operational disruption from fluid losses
- Minimized formation damage
- Preserved post-cleanup hydrocarbon deliverability
Fluid-System Design
The reservoir drill-in fluid incorporated Saber Drilling Fluids’ proprietary Disolv-Seal® technology as a temporary formation-sealing component. The system was designed to bridge irregular pore throats and vug openings as they were exposed, forming a removable barrier between the circulating fluid and the reservoir.
The design focused on maintaining circulation, limiting whole-fluid and filtrate invasion, supporting effective hole cleaning and manageable hydraulics, reducing dependence on reactive lost-circulation treatments, and preserving hydrocarbon deliverability following cleanup and completion.
Disolv-Seal® was incorporated into the active fluid system to circulate continuously across newly exposed reservoir surfaces. As the fluid contacted porous and vuggy dolomite, the bridging package formed a temporary filter cake across fluid-entry pathways.
The fluid was managed to balance sealing performance, circulation, wellbore condition, and reservoir protection while remaining removable during the planned cleanup and completion sequence.
Field Application and Results
The fluid system was used while drilling the horizontal reservoir intervals of both wells on the pad. Circulation was maintained, and both wells were drilled to their planned total depths.
Maintaining returns allowed drilling to continue through the planned reservoir exposure without curtailing the laterals due to uncontrolled fluid losses. The proactive sealing approach also reduced the operational disruption associated with repeatedly stopping to treat losses.
The field response was consistent with effective temporary bridging of the exposed pore and vug system—based on observed circulation behavior and the ability to continue drilling through the reservoir.
Following drilling, the sealing material was removed during the standard cleanup and completion process, supporting reservoir performance objectives.
