Drilling waste management companies – Kosun offer Oil and Gas handbook for gives a set of rules that must be followed to manage Drilling waste. It is available on requesting Oil and Gas Commission (OGC).
Drilling waste management companies told you that, it is important to first separate the mixture of solid and the drilling fluids. The drilling fluid that is obtained can be reused. The solids that are obtained must be either disposed of in an eco-friendly manner or can be used in some particular places.
Some the standard rules that must be adopted to minimize waste are:
1] Drilling Waste Containment:
• The waste obtained from drilling must be properly contained either in a sump (earthen hole) or good quality tanks.
• There must be proper record of how the drilling waste is stored and how is it disposed.
• It must not be mixed with other wastes.
2] Suitable Disposal Sites:
• The site where the waste is doing to be disposed must suitable and must not cause pollution.
• The suitability of the sites is soil is assessed and its salinity is measured.
• Any toxic waste cannot be disposed. These types of wastes needs to be treated.
• There are many reasons that can make the waste toxic, like, corrosion inhibitors, emulsifiers, lubricants, de foaming agents and even some type of bacteria.
3] Disposal Methods:
• There are many ways of disposing the waste of different kind.
• For water based mud systems, there are disposal options such as on- site disposal options and off-site disposal options.
4] Wastes from pipelines:
• When drilling a pipeline for fresh water or drilling a freshwater well, the drilling waste that is obtained here can be managed in many ways like, storage pits where pits are formed in soils and other off-site disposal options such as land spraying and land spraying while drilling.
Every process that is initiated has its outcomes. Oil drilling basically involves boring into the ground and penetrating rock by use of specially designed tools. During drilling, the rotary drill bit grinds downwards penetrating layers of rock. In the process, large rocks cuttings that have been broken up result. These rock cuttings are called drill cuttings. The process of drilling, separating and directing drilling fluid to the down-hole creates drill cuttings which are drilling waste.
However, drilling waste are not limited to drill cuttings alone. They involve
• Muds that have been so degraded that they can no longer be rejuvenated by recycling, but need to be disposed of.
• Mud that is discarded or spilled.
• Solid laden wet mud and cuttings that have been separated from the drilling fluid without having been recycled and are not useful for recycling.
• Solids that are removed by centrifuges from the mud stream.
Synthetic Based Muds (SBM) drill cleaner holes with minimal sloughing and produce less drill cuttings thereby generating less waste unlike the Water Base Muds (WBM). Most of the Oil Based Muds (OBM) and SBM are recycled and therefore minimize drilling fluid which reduces waste.
Wastage is a normal consequence of the drilling process. Drilling involves extracting the desired end product from a mass of other unwanted products such as sand, silt, fibres, drill cuttings and mud. Because the process involves drilling fluid and mud, the mass of waste is usually a wet mixture. If these unwanted products mix with the drilling fluid they will contaminate it and bring the process to nothing at inception. The use of Solid Based Mud (SBM) and Oil Based Mud (OBM) is recommended because they are less pollutant than the Water Based Mud (WBM) which cannot be recycled. It is important that companies adhere to the regulations governing drilling waste management.