Effect of Gas-Oil Ratio on production rate in Z Field Well X

Florentino L. S Amaral Soares; João  Alves Nicolau

Florentino L. S Amaral Soares Department of Petroleum Engineering, Dili Institute of Technology (DIT), Timor-Leste
João Alves Nicolau Department of Petroleum Engineering, Dili Institute of Technology (DIT), Timor-Leste

Keywords: Gas-oil ratio, nodal analysis, tubing, production rate.

Abstract

Gas-oil ratio (GOR) is the ratio of the volume of gas that is liberated from the solution to the volume of oil and this situation occurs because of the temperature and pressure decrease to the surface condition (60 ⁰F and 14.7 psi). When the reservoir pressure above the bubble point pressure there is no prevailing free gas however in gas cap reservoir and in solution gas drive reservoir which the reservoir is depleted, reservoir pressure is going to decline and gas will come out of the solution, when gas is mobile, producing GOR occurs. This study is conducted in Z field well X that is producer well and is performed using steady-state, multiphase flow simulator (PIPESIM v2011.1) with the goals to examine the effect of low increase gas-oil ratio variation on production rate with a single tubing inside diameter. The effect of each case of produced gas-oil ratio on production rate with variation of tubing inside diameter. And the optimum tubing inside diameter (ID) with each case of produced gas-oil ratio. Case 1 with producing GOR 60 scf/stb, case 2 with GOR 90 scf/stb and case 3 with producing GOR 120 scf/stb and tubing ID varies from: 1.751-in, 2.441-in and 3.068-in. The results indicate that when amount of gas-oil ratio increases production rate is also going to increase in Z field well X and the larger the tubing ID the greater the production rate, in this case 3.068-in is the optimum tubing ID based on higher production rate.

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