Apr 12

Cuttings Re-Injection

Cuttings Re-Injection (CRI) is an in situ method for the disposal of drill cuttings and other drilling wastes into a sub-surface stratum. Drill cuttings are slurrifi ed with water (fresh or sea water) and ground down to a pre-determined particle size. The particle size is achieved by passing through a shaker screen. Slurry of the correct particle size and physical properties is injected via a pump, which is typically of a triplex design, into the well head at a given pressure and down into the predetermined sub-surface injection zone. Oversize particles from the shaker are re-circulated for further grinding.

Drill Cuttings Thermal Treatment

This thermal process is designed to treat NADF Drill Cuttings (base oil can be diesel, low toxicity, or synthetic), which reduces the oil on the solids exit the process to < 1% dry weight, and recovers the valuable base oil in a state suitable for reuse. This process has been successfully operated and therefore licensed in the UK and Holland. To date the operating plants have processed well in excess of 100,000 MT of drill cuttings after shale shaker. The process is not designed for processing water based waste or wastes with a very high liquid content. The process is not suitable for processing ester based drill cuttings, as the ester breaks down at the process temperatures.

Chemically Enhanced Centrifugation For Cuttings

Cuttings Chemically Enhanced Centrifugation, CEC, otherwise known as fl occulation, is a method to enhance the remove of fi ne solids in WBM through a centrifuge. Small quantities of additives are mixed with the used WBM, which coagulate and fl occulate fi ne colloidal solids into a larger clumps, which are then easily removed using a centrifuge. CEC reduces the volume of waste mud generated as it allows the clarifi ed fl uid to be reused to build new drilling fl uids. Overall the total volume of waste, the size of the pits, and the quantity of water required per well are all reduced.

Drill Cuttings Soidification and Stabilisation

Oily drill cuttings from the shale shakers may not be suitable for direct disposal to land without further treatment. Regulations in some countries require the “waste” to meet certain criteria such as the leachability of specifi ed contaminants. Solidifi cation and stabilisation of the drilling waste is a method whereby the raw cuttings from the shaker / centrifuge are mixed with additives in order that the treated wastes will meet the criteria for land disposal. Solidifi cation typically refers to encapsulating the waste such that the leachability of contaminants is reduced by minimising the surface area of the waste exposed to leaching, or by totally encapsulating the waste with an impervious layer.

Please contact GN Solids Control for inquiry of drilling cuttings treatment equipment


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One Ping to “Drilling Waste / Cuttings Disposal”

  1. How To Disposal Drilling Cuttings? | GN Nodig Mud Recycling System Says:

    […] clients are asking me how to disposal drilling cuttings after treatment. There are four ways for disposal as […]

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