Rishabh's Polymers have been specially developed to meet the requirements of enhanced (tertiary) oil recovery projects. Their purpose is to increase the viscosity of the aqueous slug which is intended to drive the oil to the production wells.
The use of water alone (secondary oil recovery) is possible and is indeed being practiced. This however leads to the effect known as fingering and channeling.
Fingering is the term usually used to describe the passage of fluid through oil bearing pores when this fluid makes its way through the oil without displacing it. Channeling is a phenomenon that seems to arise because the permeability of a formation, even in the microscopic sphere, is not uniform; water will preferably pass through the channels of the highest permeability. Both these effects result in much of the oil being left in place and not being recovered.
Raising the water viscosity reduces it mobility (for exact definition, see corresponding technical literature) and leads to a much more effective oil sweep. The process is still more efficient when interfacial forces are reduced by special surfactants.
Rishabh Shale Stabilizers (PHPA) are used in low solids and clear water drilling fluids on its own or in combination with potassium chloride to give a high degree of shale encapsulation. Clay and shale problems such as swelling, sloughing, bit bailing and flow plugging can be effectively prevented.
By preventing the dispersion of cuttings and flocculating small particles, Rishabh polymers ensure that no uncontrollable build up of solids or viscosity takes place. These polymers develop very high viscosity in fresh water. The solution viscosity decreases progressively with increasing electrolyte content, but the shale encapsulating properties are maintained unless there is an unusually massive influx of divalent cations.
The friction reducing properties of Rishabh's PHPA solutions minimize drag and wear and also lead to an easier and more complete recovery of cores.
Emulsions may be broken by chemical, electrolytic or physical methods. In breaking emulsions the stabilizing factors must be neutralized to allow the emulsified droplets to coalesce. The accumulated electric charges on the emulsified oil droplets are neutralized by introducing a charge opposite to that of droplet. Chemical emulsion breakers/ deoilers provide this opposite charge for neutralization.
Organic deoilers developed by Rishabh are extremely effective emulsion breaking agents, giving more consistent results and produce a better effluent quality than inorganic coagulants or other commercially available deoilers.
Presently conventional coagulants (i.e. salts of Aluminium or Iron) are used to remove turbidity in water. These pose problems of carry over finely divided flocs of aluminum hydroxide or ferric hydroxide into the clarified water and produce bulky sludge having a high water content.
During monsoon season when turbidity suddenly increases, numerous problems are faced in treatment of water with conventional chemicals e.g. Alum and Lime.
Rishlyte range consists of 'nontoxic' cationic polymers which greatly replace the use of such inorganic coagulants and also reduce cost of treatment. Numerous other benefits include -
a) Reduction in sludge volume and desludge frequency.
b) Reduction in Aluminium ion carryover which is a health hazard.
c) Reduced load on DM plant and no drop in pH of treated water.
d) Reduction in corrosion in alum addition pipeline and pump.
e) Automated dosing & controlling of turbidity in plants
f) Savings in labour and electricity costs
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