Abstract

Horizontal wells are prolific producers for achieving higher recovery, particularly in heavy oil fields due to larger drainage radius, higher liquid withdrawal capacity as well as having fewer water coning and sand production problems. We have in this paper explained the planning & execution of one of recently drilled up-dip horizontal well in Lanwa field of ONGC Mehsana Asset, which leads to the multi-fold increase in the oil production and also reduced the significant well cost. Lanwa oil field of ONGC Mehsana Asset is having one of the heaviest crude oil in the Cambay basin, with viscosity ranges upto 1500 Cp (12o -13o API) at reservoir temperature (60-70 degree Celsius). Main reservoir rock of Lanwa field is unconsolidated Kalol sands deposited in the form of braided bars. Average inclined or vertical well productivity in the Lanwa field is around 2 tpd, therefore large amount of oil inplace (~35 MMt, PD category) still inaccessible due to suboptimal well production. Thus horizontal and high angle wells have been introduced in year 2015 in the southern part of the field along with updip line drive air injection mechanism. Horizontal well