Drilling fluids and O&G drilling mud solids removal

Jan. 29, 2011 - PRLog -- Weighted drilling fluids

Eliminating the very small drilled solids and barite (colloidal particles). Traditionally, decanting centrifuge is used with weighted fluids to reduce dilution requirements by comparison of the cost of the centrifuging with the value of the barite recovered from the
discarded fluid is a frequently used measure of its economic effectiveness.

However, the purpose of solids remove equipment is to eliminate undesirable drilled solids.
And the disposal of the liquid in the overflow increase waste volumes significantly.
There is a direct effect of centrifuging on waste volume. Dilution volume of the centrifuge feed
http://www.gnsolidscontrol.com/drilling/variable-high-speed-decanter-centrifuge/

Less obvious, but of greater importance, is the fact that the disposal of the colloids and nearcolloids discarded with the liquid provides a better drilling fluid, reduces dilution requirements and therefore, the volume of waste generated.


Unweighted drilling fluids

The economics of discarding the underflow of centrifuges used for solids reduction with unweighted drilling fluids can be evaluated by comparing the cost of the solids removal with the cost of the dilution required by the incorporation, rather than removal, of the separated solids, and the differences in waste disposal costs.

The effect of centrifuging upon the drilling mud cost can be determined by calculating the volume of dilution that would have been required to compensate for the incorporation of the separated solids, and multiplying the unit cost of the fluid.

Added to the cost of preparing it. All dilution adds directly to waste volume, the cost of disposing of the dilution volume must be much higher
http://gnsolidscontrol.blog.com/desilter-using-in-oil-gas...


Drilling mud systems

This clause is intended as a guideline for the design and operation of surface drilling fluid handling

Following these practices maximises the performance of the surface systems and improves drilling fluid quality. Deviating from these practices diminishes system performance, and increases dilution requirements, by allowing separable solids to re-circulate in the drilling fluid system.


Solids removal system apparatus

The surface drilling mud system consists of the flow line, active tanks, reserve tanks, trip tank(s), agitators, pumps, motors, solids and gas removal devices, mixing and shearing devices, and associated piping. The surface drilling fluid system is composed of the following six sections, including

1)Removal section, the tanks and equipment used for the separation of drilled solids and gas from additives.
2)Addition section, the equipment and tanks utilised in the addition and blending of drilling fluid mixing equipment.
3)Suction section, the tank(s) from which the rig pumps take suction, and any associated pumps or active system.
4)Reserve section, the tank(s) or pit(s) and associated equipment used to isolate drilling fluid from the process drilling fluid and cuttings for disposal.
http://www.gn-desander-desilter.com/mud-tank-manufacture-...
5)Discharge section, the tank(s) or pit(s) and equipment located at the well site used to store and systems for gauging pipe displacement during tripping operations.
6)Trip tank section, the tank(s) and associated equipment used to isolate drilling fluid from the active tank

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