• P. Harish Kumar Lovaraju
• V.V. Srimannarayana

Oil well test analysis is a branch of reservoir engineering. Data obtained from flow and pressure transient tests about in situ reservoir conditions are significant to determine the reservoir production capacity. Average reservoir pressure also can be estimated by these tests. The reservoir engineer must have sufficient data and information about the reservoir/well characteristics and conditions to examine reservoir performance appropriately and to prognosticate future production under various modes of operation. Generally, oil well test analysis is performed to meet the following objectives- Evaluation of reservoir characterization and well condition, skin factor estimation or completion and drilling related damage to an oil well, determination of whether all the drilled portion of oil well is also a producing zone. Several methods of analyzing pressure build up data in wells have been presented by various authors. We dealt with the theory and method of Horner and Miller- Dyes-Hutchinson and presented calculations of the same and worked on data obtained during testing of various kinds of wells. These calculations include determination of formation permeability (K), skin factor(S), wellbore storage coefficient (Cs), additional pressure drop due to skin (ΔPs), flow efficiency (F.E) and initial reservoir pressure. The semi-log analysis technique has been used to determine the permeability, apparent radius and skin from the pressure drawdown data. The drainage area, pore reservoir volume portion being drained by the test well and initial oil in place in the drainage area are calculated from the Cartesian plot of ΔP(initial reservoir pressure – flowing bottom hole pressure) versus time.

"Pressure Transient Test Analysis to Determine Wellbore Performance", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 6, page no.f539-f558, June-2022, Available :http://www.jetir.org/papers/JETIR2206568.pdf

"Pressure Transient Test Analysis to Determine Wellbore Performance", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 6, page no. ppf539-f558, June-2022, Available at : http://www.jetir.org/papers/JETIR2206568.pdf