Polyacrylamides are used in enhanced oil recovery (EOR) to improve the speed and amount of oil extracted from the reservoir. The techniques used to improve oil recovery can be straight forward polymer flooding(PF), surfactant polymer flooding(SP) or alkaline surfactant polymer flooding(ASP). The latter technique, when applicable, has been known to sweep the reservoir of 90% of the oil in place. Polymers is added to the injection water to increase viscosity which improves sweep efficiency and provides mobility control between water and oil.
Polymer flooding can yield a significant increase in oil recovery compared to conventional water flooding. Polymer is mixed and injected continuously for an extended period of time until about 30 to 50% of the reservoir pore volume in the project area have been injected. The polymer slug is followed by continued long-term waterflooding to drive the polymer slug and the oil bank in front of it toward the production wells.
In CEOR, recovery of residual oil is achieved by adding surfactants and alkali to the injection water. Surfactants decrease the interfacial tension between oil and water and alkali agents can be added to generate in-situ surfactants and help to reduce the high level of surfactant adsorption to the reservoir rock. Due to the high pH brought about by the addition of alkali a water softening system is needed to eliminate precipitation of hardness ions. All the polymers used for EOR are anionic and the selection of the best one for a field depends on 3 main parameters; temperature, water composition and permeability.
BHT supplies a vide range of EOR polymers in both powder and emulsion form. These cover the majority of reservoir conditions. BHT has expertise and guidelines to fine-tune the chemistry in order to limit chemical, mechanical and thermal degradation.
Scale inhibitors
BHT supplies a wide range of scale inhibitors to mitigate the damage caused by precipitation of minerals during the completion or production phases of oil and gas wells. These products can be tagged or non-tagged and supplied in powder or liquid form.
BHT EOR polymers include:
BHT supplies a wide range of polymers for water-based drilling fluid systems. Each series of polymer meets one or several requirements such as fluid loss control, viscosity improvement and shale inhibition. These polymers are produced in a variety of forms, molecular weights and compositions for specific applications.Economic drilling of oil wells requires critical properties of the drilling fluids. Many specific requirements are placed on these fluids to achieve multiple purposes. Carrying cuttings from the drill bit to the surface and permit their separation Cool and clean drill bit
Achieving a high enough injection pressure is a major problem in deep wells. Both the bottom hole pressure required to fracture a formation and the pressure loss due to friction increase directly with well depth. This is due to the cumulative effect of the overburden pressure and the length of tubing or casing the fluid has to travel through to reach the bottom hole. Polyacrylamides are used for their drag reducing properties on water to decrease frictional pressure losses, thereby maximizing bottom hole injection pressures allowing for a higher pressure from the same number of pump trucks
If the injection rate is below a critical value, the proppant may fall out of the frac fluid and cover the perforations forcing the treatment to be stopped. Drag reduction additives such as polyacrylamides are widely used to reduce the frictional pressure loss so that a higher bottom hole pressure and injection rate can be achieved. The drag reduction effect can be as much as 50 to 75% during a fracturing treatment.With the success of hydraulic fracturing, also referred to as slickwater fracturing, as a means of economically recovering unconventional gas reserves, use of polymeric friction reducers has become widespread
BHT Supplies mining reagents based on xanthate chemistry. Manufacturing plants using a wet process will use specialty mining reagents or flocculants at any stage of their operation: mining and primary crushing, beneficiation plant including flotation concentrators, hydrometallurgical and metal refining processes, tailings and effluent treatment.
In material handling, BHT provides technical solutions for dust reduction (tracks, mines, stockpiles and shipping port), dredging, hydraulic transport of slurries and antiscaling.The environment, health and safety management is of capital importance to our group and is a fundamental aspect of any good business practice.
In pyrometallurgy, BHT Supplied products can be used mainly for pelletization and sintering (iron ore, nickel sintering). Specialty chemicals would be used for the removal of heavy metals from liquid effluent produced by off-gas circuits. BHT Supplied products are used for the Copper, Alumina, Nickel, Gold, Iron ore, Coal, Phosphate, Industrial minerals, Industrial sands Aggregates.
BHT is not only a supplier of products but is there to contribute with its customers to reduce capital and operational costs of processing plants, reduce energy and water consumption and minimize its environmental footprint.