Question $2(10$ Marks$)$

An Oil Producer plan to be completed at $7000ft$ has fluid characterizations as follows.

GLR $500$scf$/$STB

Gas gravity $0\mathrm{.}65$

API $35$deg,

Average flowing temperature $140$degF

Construct inflow performance relationship curve using standing model using well test data in from Table $1$ and assume static reservoir pressure of $1900$psia. $(4$ marks$)$

$\backslash$table$[[$Test number,Flowing bottom pressure $($Psia$),$Flow rate $($BPD$)],[1,1000,1200]]$

Construct the Vertical lift performance using flowrate Q $[500,1000$ and $1500]$ and recommend the optimised production rate. Assume $200$psi tubing pressure for $2\mathrm{.}5$in tubing $(2$ marks$)$

Also construct the Vertical lift performance using flowrate Q $[1000,2000$ and $3000]$ and recommend the optimised production rate. Assume $200$psi tubing pressure for $4\mathrm{.}0$in tubing $(2$ marks$)$

Solution

Step $1-$ Calculate productivity index $(J)$ and $Jp*$

$(2$ mark$)$

Step $2-$ Calculate the corresponding flowrate for assumed $P_{wf}$

$(2$ marks$)$

$\backslash$table$[[$Pwf ${?}_{\text{w}\text{f}\text{s}\text{i}},$Q $($bbls$)],[1900,],[1500,],[1200,],[1000,],[500,],[0,]]$

Step $3-$ Plot the corresponding points on the graph paper

$(2$ marks$)$

Step $4-$ Calculate the corresponding $P_{wf}$ for assumed flowrate for tubing sizes and plot the values in the same graph paper $(4$ marks$)$