Determination of reservoir and well parameters by analyzing the pressure survey and well testing data of Kailashtilla , Biany Bazar and Rashidpur gas fields

Abstract

Well testing provides reliable information about the reservoir and the producing wells that produce from that reservoir. Main reservoir parameters, total permeability-thickness product, kh (md. ft), average permeability, K (md) and initial reservoir pressure, Pi (Psia), and well parameters such as wellborstorage coefficient, C (bbl/psi) and skin, S, are estimated in this project work by using well testing software package (Well Test by Fekete associates Inc.). Data were collected from 8 (eight) wells, 3 (three) of Kailastilla Gas Field, 2 (two) of Biany Bazar Gas Field, 3 (three) of Rasidpur Gas Field, operating under Sylhet Gas Field Limited (SGFL), a company of Petrobangla. Same data are analyzed by Almansoori Wireline Services, a third party welltesting service provider. Intercomp-kanata Management Ltd. (IKM), Oil & Gas Field Exploration Services Company, also determined these reservoir and well parameters under a contract with Petrobangla. The results of the analysis of this project work, AL Mansoori Wireline Services and IKM are shown in a table at the end of the diagnosis of each well. The synthetic pressure and pressure derivative data match with actual pressure and pressure derivative plots, Absolute Open Flow (AOF), coefficient, C, and exponent, n, of the deliverability equation are estimated through this thesis work. The main parameters average permeability, K (md), and skin, S, for KTL#1, KTL#2, KTL#4, BB#1, BB#2, R#1, R#4 and R#7 are 134 and 2.4, 5575 and 4.1, 238 and 9.8, 213 and 17.1, 95.6 and 13.8, 2150 and 7.2, 16 and -4.8, 20.8 and -0.70 respectively. However, from core data analysis; Average Permeability of the Middle Gas Sand, producing zone of KTL#1 and KTL#4, of Kailastilla Gas Field is 88.4 md, and 424.3 md for the Upper Gas Sand, producing zone of KTL#2, of Kailastilla Gas Field, Average Permeability of the Lower Gas Sand, producing zone of BB#1, of Biany Bazar Gas Field is 189.6 md, and 332.4 md for the Upper Gas Sand, producing zone of BB#2, of Biany Bazar Gas Field, and Average Permeability of the Upper Gas Sand, producing zone of R#1, R#4 and R#7, of Rasidpur Gas Field is 370.0 md.