Cellulose fiber is a fibrous lost circulation material that mats across porous and fractured openings to build a seal. Ironstone supplies drilling-grade cellulose fiber LCM in fine, medium, and coarse grades, with a certificate of analysis for every batch.
Fibrous LCM works by interlacing into a mat over pore and fracture openings, which forms a base that other solids can build on. That makes fine fiber a first-line material for seepage losses and a common component of partial-loss blends, especially in porous, highly permeable formations. It is often combined with sized calcium carbonate and, in fractured ground, with resilient graphite. For total losses through large openings, fiber alone will not bridge — that needs coarse blends or a plug.
| Property | Typical | Basis |
|---|---|---|
| Grades | Fine, medium, coarse | Sieve |
| Fiber size range (across grades) | About 0.025 – 2 mm | Sieve |
| Cellulose content | About 80% | — |
| Bulk density | Low (fine grades roughly 30 – 60 g/L) | — |
| Appearance | Tan to brown fiber / granules | Visual |
| Fiber length per grade / degradation temperature | Stated on the certificate of analysis | — |
Typical grade ranges; fiber length differs sharply by grade, so the exact figures are stated per grade on the certificate of analysis.
Fine fiber is added at background concentration to treat seepage and drill ahead; heavier concentrations and coarser grades go into partial-loss pills. As with graphite, only fine material can pass a downhole motor or measurement tool, so match the grade to the tightest restriction in the string. The LCM selection guide sets the grade and concentration by loss rate.
Indicative CIF price on request; indicative FOB ranges appear in the monthly Price Letter. For a firm price, send your grade, volume, and port on WhatsApp.