ISSN(Online) : 2319-8753 ISSN (Print) : 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 5, Issue 12, December 2016 Copyright to IJIRSET DOI:10.15680/IJIRSET.2016.0512057 21245 Porous Media Characterization for Feasibility Study of Oil Well Water Production Control Dhrubajyoti Neog 1 , Pradip Borgohain 2 Assistant Professor, Department of Petroleum Technology, Dibrugarh University, Dibrugarh, India 1 Professor, Department of Petroleum Technology, Dibrugarh University, Dibrugarh, India 2 ABSTRACT: The Upper Assam Basin, the earliest explored petroliferous basin of India has been producing hydrocarbons since 1989. Currently, it is reported that a large numbers of wells in the basin are producing high volume of water alongwith crude oil. This present study aims to the characterization of the aquifer support porous media in a part of oil bearing horizon belonging to tipam sandstone formation at depths 2483-2487m, 2504-2506m, and 4504.50m of reservoir formation with temperature 72-76 0 C belonging to some high water cut wells of Upper Assam Basin. The objective is to find out the feasibility of polymer-gel system for conformance control. Based on petrography, scanning electron microscope study, reservoir temperature, initial and current pressure, driving mechanism and API gravity of crude oil it could be concluded that channelling is the main problem for high water cut from the reservoir of Upper Assam basin and polymer gel system could be a measure towards in-situ reduction of produced water (P.W). KEYWORDS: Characterization, porous media, heterogeneity, clay minerals. I. INTRODUCTION The certain oil wells of Upper Assam Basin currently produce excessive water causing abandoning in some cases for the failure to extract with environmental compliance and economic efficiency. Water shut off to extract crude oil from the depleted reservoir with high water cut production would reduce the abandoning of such oil wells. The presence of heterogeneities and natural fractures put impact on crude oil production and accelerate water cut [1, 2]. The water channelling through high permeability layers is reported in heterogeneous reservoir. The matured porous media are a major concern for high water cut [3]. The injection of polymer gel i.e., chrome acetate polyacrylamide gelant treatment in Arbuckle reservoir that produced under natural water drive with high water cut resulted drop in water production [4]. The Iranian oil reservoir at temperature 90 0 C (194 0 F) was studied with PAM/chromium acetate polymer gel for water shut off as referred by Simjoo et al. 2007 [5]. The study of clay minerals viz., kaolinite [Al 2 Si 2 O 5 (OH) 4 ], illite [KAl 3 Si 3 O 10 (OH) 2 ], chlorite present as [NaClO 2 or Mg(ClO 2 ) 2 ], smectite, corrensite clay minerals, quartz (SiO 2 ), feldspar (KAlSi 3 O 8 – NaAlSi 3 O 8 – CaAl 2 Si 2 O 8 ) and mica [KAl 3 Si 3 O 10 (OH) 2 ] in the porous media indicates the pore distribution pattern and permeability within the reservoir rock. The reservoir to be considered for polymeric gel treatment include parameters viz., temperature (< 353.15K), API degree (oil) > 25, permeability > 100 mD, rock sandstone, with low heterogeneity and clay content [6]. In the present work, the impact of clay mineralogy on reservoir quality is evaluated with the help of thin section petrography and scanning electron microscopic (SEM) analyses of the reservoir formation (72-76 0 C) to find out the feasibility to be shut off with the polymer-gel system for enhanced oil recovery. The main objective of present study is to find out the facts behind the high water cut in a part of the oil producing horizons of Upper Assam Basin. The present study is dealing with the characterisation of the porous media with respect to its mineralogical and textural characteristics and their role in controlling the petrophysical properties of the rock.