The most common oil field wellbore problem encountered is paraffin deposition in the production tubing. The crude oil production is impeded by accumulation of such waxy residues that tend to clog the tubing, perforations and pores of the reservoir rock through which the oil flows.Hot oiling with the help of coiled tubing is usually the method applied for removing paraffin deposits, however there is a high possibility of significant amount of the fluid injected into the well being lost to the formation, and hence the potential to damage the formation with low bottom-hole pressure is high. One such case was encountered in a well operated by Oil India Limited and this paper provides details of innovative technique applied for successful execution of hot oiling operation in the low BHP well minimizing formation damage.As the well had very low BHP, there was a need to use circulating fluid with density lower than that of the source oil utilized for conventional hot oiling operation. Hence, it was decided to carry out the job by using a mixture of hot oil and nitrogen gas so as to reduce the density of the circulating fluid, thereby avoiding loss of injected fluid to the formation.This paper provides the case study of the successful operation carried out in the well along with the detail calculations of pumping rates and pressure of both hot oil and nitrogen gas to obtain the desired density of the circulating fluid.
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