The supply base is where drilling waste comes ashore — back-loaded cuttings, spent fluid and the residue of the plant's own reconditioning — and managing it correctly is both an operational and a regulatory task. Getting the routing and the documentation right is as important as the physical handling. This page covers drilling waste at the base.
What comes ashore
Supply vessels back-load cuttings and waste fluid from the rig, and the plant's own reconditioning produces removed drilled solids and unrecoverable slops. All of it has to be received, characterised by type and contamination, and routed — oily cuttings, water-wet cuttings, spent water-based and oil-based fluids and slops each follow different paths.
Treatment and disposal routes
Waste follows defined routes by type: oily cuttings to treatment such as thermal desorption (TDU) to recover base oil and produce a cleaner solid, water-based cuttings to stabilisation or approved disposal, recoverable fluid back through reconditioning, and residue to licensed disposal. In some operations cuttings re-injection (CRI) is an option. Choosing the right route for each stream is the core of the task.
Oil-on-cuttings and discharge limits
Where any discharge is involved, oil-on-cuttings and effluent limits set by regulation govern what is permissible, and treated streams must meet those limits before release. The numbers and methods are regulator-specific, so the plant works to the applicable limits rather than a generic rule, and documents compliance for each stream.
Environmental compliance and tracking
Base-side waste is governed by environmental regulation, which requires characterisation, tracking from receipt to disposal, and licensed disposal routes. The documentation trail — what was received, how it was treated, where it went — matters as much as the physical handling, because compliance is demonstrated by records, not just by intent.
Tied to the mud plant
Waste management sits physically and operationally alongside the mud plant because they share streams: reconditioning recovers what it can and passes the rest to waste, and the plant's slops and solids feed directly into the waste system. The two are designed to work together so recovery is maximised and only the true residue is disposed of.
Characterise, route, document
Drilling waste at the base is received, characterised and routed by type to treatment, recovery or licensed disposal under environmental regulation, with full tracking. Correct routing maximises recovery and minimises disposal, and the documentation is what demonstrates compliance — both are the substance of base-side waste management.
Key takeaways
Drilling waste at the supply base — back-loaded cuttings and waste fluid plus reconditioning residue — is received, characterised and routed by type to treatment (thermal desorption, stabilisation), recovery, re-injection or licensed disposal, meeting oil-on-cuttings and effluent limits and tracked from receipt to disposal under environmental regulation. It works hand-in-hand with the plant's reconditioning. Correct routing and documented compliance are the substance of the task.