(727d) Correlation of the Formation Damage for Secondary Reservoir Pressure Maintenance

The biggest waste volume comprises of Formation Water (FW) from oil-fields as it disturbs the ecological balance if discharged into environment without requisite treatment. The raw FW was characterized initially which was further gravity separated, centrifuged and also treated in an effective sand filter respectively where all the parameters were evaluated gradually. The properties of the core sample were also evaluated where its porosity, permeability and the presence of various minerals were determined. Through the core sample, the water carrying contaminants and the various stages of the treated water were passed through it using the core flood apparatus. The flow of the treated samples was also observed in the microfluidic apparatus.

The physical, chemical, organic and inorganic parameters of all the samples were characterized respectively. The results were compared with the specification provided by the Central Pollution Control Board (CPCB) of India where the sand filter treated samples was found to be within range. Initially, the core samples had a porosity of 24.74%, permeability of 64 md and have various minerals present in the form of clay as kaolinite, illite, montmorillonite, chlorite, quartz and feldspar. Generally, in an oil industry treated samples were introduced in the oil-bearing reservoir for secondary reservoir pressure maintenance. In this laboratory study experiments were conducted in where the treated sand filter, centrifuged, gravity separated and raw water samples respectively were glide through the core flooding apparatus and it was observed that the value of porosity and permeability have reduced gradually. It was further conformed in the microfluidic apparatus. The raw water samples have a high quantity of Oil & Grease (O&G), dissolved and suspended solids, inorganics and bicarbonate which blocks the pores and also reacts with the core sample leading to formation damage to a larger extent. There are numerous techniques of understanding the formation damage but this new study will provide us with a brief idea about the actual effects of formation that occurs at the sub-surface by collecting reservoir core sample and oil field produced water.