Application of Nanoparticle Aided Silicate Reservoir Conformance Control Method at the Algyo Field, Hungary: Fundamentals and Case Histories

Lakatos, I. (University of Miskolc) | Szentes, G. (University of Miskolc) | Vago, A. (Hungarian Oil and Gas Plc.) | Karaffa, Z. (Hungarian Oil and Gas Plc.)


Reservoir conformance control (RCC) might be fundamental designing profitable production technology in oilfields. Appropriate application of RCC methods can significantly result in improved IOR/EOR through reduced water production and profile correction. In the past decades, numerous techniques were extensively applied with these goals; however, the operators did not appreciate the silicates until mid-1970s despite the fact that emblematic professionals proposed the silicate gels as efficient alternatives to organic gel technologies. Recently, the attitude towards the extensive use of silicates in oilfields has changed. The silicate-based water shutoff treatments and profile control methods have been already used more than hundred times in Hungary, Serbia, Norway, USA, Oman, and other countries. In the past several years, the fundamental and applied research focused on elimination of inherent negative properties of pure silicate gels, and development of efficient and flexible technologies using polymers and nanosilica in the treating solutions. As a result, the diverse silicate RCC methods arouse high interest in oilfield applications. Today, the environmentally friendly composition of the chemical systems, viz. the green technologies are particularly appreciated by the operators.

The presentation summarizes the results of both the fundamentals and a pilot tests accomplished in the Algyő field, and critically analyzes the lessons to learn. Base on the publications disseminated until now it can be concluded that these field jobs demonstrate outstanding responds both in water cut and increased oil rate. It was also proved that the nanoparticle-induced (nucleated) formation of silicate gels could potentially be used in all types of porous and fractured reservoirs. In addition, the in-situ formed gels have outstanding thermal stability up to 150°C, the chemicals are mass-produced and available at low price, the job needs simple surface facilities, and customary human force to operate the RCC method. Consequently, the green silicate methods being low OPEX and CAPEX expenditure, the technology may open new vistas curing numerous problems arising at both oil and gas fields even in time of volatile oil and gas price.