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Abstract Nanoparticle dispersions (NPDs) are an emerging new technology in the oil and gas industry which can be applied to EOR, well remediation, and formation damage removal to stimulate hydrocarbon production using the unique properties that colloidal particles possess. Nanoparticles have a high surface area to volume ratio allowing a greater efficiency for chemical interactions to occur. However, nanoparticle dispersions are often difficult to stabilize in harsh downhole environments. The dispersion can quickly become unstable and agglomerate when the fluid is subjected to changes in pH, or encounters increased salinity and/or temperature. Agglomeration renders the fluid ineffective, and at worst can cause severe damage to the formation. The development of highly concentrated nanoparticle dispersions stable in high TDS brine at high temperatures has been achieved and verified in the laboratory with imbibition tests and dynamic core flow experiments. NPDs can be stabilized in the reservoir by altering charge density, hydrodynamic diameter, and the zeta potential of the particles. This is accomplished by surface modification, as well as with the addition of stabilizing chemistry. This paper presents solutions to the destabilizing elements encountered in the reservoir, that until now have inhibited the downhole utilization of nanoparticle dispersions. Stability research of NPD fluids in brines empirically illustrates that by chemically modifying the particle surface and the surrounding aqueous environment, the fluids will remain properly dispersed and active in destabilizing bottomhole conditions. This will further pave the way for industry research into new applications of nanoparticle based fluid systems.
Improvement of Silicate Well Treatment Method by Nanoparticle Fillers
Lakatos, I.. (Research Institute of Applied Earth Sciences, University of Miskolc, Miskolc-Egyetemvaros, Hungary) | Lakatos-Szabó, J.. (Research Institute of Applied Earth Sciences, University of Miskolc, Miskolc-Egyetemvaros, Hungary) | Szentes, G.. (Research Institute of Applied Earth Sciences, University of Miskolc, Miskolc-Egyetemvaros, Hungary) | Vágó, Á.. (Hunfarian Oil and Gas Plc., E&P Division, Kiskunhalas, Hungary)
Abstract The divers silicate technologies have been used more than 120 times in Hungary, Germany, Serbia and Oman for reservoir conformance improvements including water shut-off and profile correction in oil and gas wells, restriction of gas conning in oil reservoirs, blocking of gas leakage in gas storage and restriction of CO2 migration in a collapsed well. The advanced methods based on simultaneous application of polymers, urea, humates, etc. recognizing that the pure silicate gels have disadvantageous properties under reservoir conditions. The present efforts were focused on replacement of some additives in gel-forming solutions; meanwhile the efficiency of the method remained the same or even better under various formation conditions. Based on earlier results, it was proved that addition of water-soluble polymers to silicates improved significantly the stability and flexibility of such gels. Beside the beneficial effects, however, the polymer-containing silicate solutions may also have some drawbacks to placement and in-situ dispersion of treating fluids. These difficulties can be eliminated by replacing polymers with nanomaterials. The detailed laboratory studies focused on polymer free, but SiO2 and Al2O3 nanoparticle containing silicate solutions. Results of laboratory study of gelation mechanism, rheological properties, flow behavior, and nanoparticle sizing served to draw fundamental conclusions. It has been shown that these nanomaterials can replace completely the polymers, they are compatible with even low permeability porous, and fractured media, and less pH-controlling agent is necessary to catalyze gelation. Recently, the efficient and flexible silicate technologies arouse high interest in oil and gas production. Their environment friendly solutions are particularly appreciated. Replacing the often-questionable synthetic polymers in gel-forming solutions with nanomaterials is the final step toward to use harmless chemicals in absolute sense. Based on the laboratory tests the silicate/nonmaterial method was tailored to oil producers operating in the largest Hungarian oil field. The pilot tests will be carried out in 2013. Combining silicates and nanomaterials, new and efficient method was developed for water shutoff and profile correction in various oil and gas fields and that may open new vistas in improvement of well performance of both producers and injectors.
- North America > United States (0.69)
- Europe > Norway (0.67)
- Europe > Hungary (0.67)
- Asia > Middle East > Oman (0.24)
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.48)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Statfjord Group (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lunde Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lista Formation (0.99)
- (2 more...)