Dec 29

Mainly there are 3 types of drilling fluids, water-based mud, oil based mud & synthetic based mud.

Synthetic-based fluid is a mud where the base fluid is a synthetic oil. This is most often used on offshore rigs because it has the properties of an oil-based mud, but the toxicity of the fluid fumes are much less than an oil-based fluid. This is important when men work with the fluid in an enclosed space such as an offshore drilling rig.

There is a technical limit to what can be achieved with water-based fluids, especially in the short and medium terms. For this reason, I believe advances in the environmental performance of synthetic-based fluids can be expected to occur faster, in combination with improved treatment and new drilling techniques. But synthetic based mud’s cost is much higher than water-based mud.

The mud recycling system for the 3 types of mud is basically similar but has little difference.

synthetic based mud recycling system

synthetic based mud recycling system

Synthetic based mud is mostly used for offshore drilling, people sometimes do not process and recycle the used mud at jobsite, they have the used drilling fluids in mud pits and transport them to a drilling fluids plant or factory for recycling and treatment, then ship back to the rig. In some other situations, they have the solids control system at jobsite, but no drilling waste management equipments at jobsite.

Water based mud is with cheaper cost and also environment friendly, it is mainly used for land drilling, in most oilfield in China or some developing countries, water based mud is widely used, and it works well with solids control system produced in China.

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Mar 31

When water-based muds (WBMs) were used, only limited environmental harm was likely to occur, but when operators employed oil-based muds (OBMs) on deeper sections of wells, the resulting cuttings piles created impaired zones beneath and adjacent to the platforms. So it is necessary to process drilling waste by GN drilling waste management system.

offshore drilling waste manaegement

offshore drilling waste manaegement

Many offshore rigs do not process the drilling waste or even drilling mud at site, because there are professional facilities who can recycle the drilling mud and process the drilling waste. Then the rig can re-use the recycled drilling mud. Unlike onshore drilling rigs, there are complete solids control systems in onshore drilling site.

The drilling waste produced by onshore drilling are mainly drilling cuttings and less water, which can be transferred by screw conveyor to hi-G shaker or vertical cutting dryer for further process.

The drilling waste produced by offshore drilling usually is not produced by solids control equipments, they are collected by containers then transport to the drilling waste management facilities for process. Firstly they are pumped to shale shaker( drying shaker), then desander, desilter cone, the clean fluids can be processed by decanter centrifuge directly. The cuttings are transferred to vertical cutting dryer, then to decanter centrifuge, the clean fluids are collected and re-used in offshore drilling rig.

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