 extent and initial pressure. These results are shown in table 4.1. This fulfils the aim and objective of this work.
Saphir, the software used for the analysis is very user friendly and timely. It is also accurate and informative compared to manual calculations and plotting.
Bottom-hole flowing pressure of the wells was determined using equation 4.2 at the operating rate. Bottom-hole flowing pressure for 2L, 2S, 3L and 3S are 175.374, 5,991.85, 515.472, 709.356psia respectively.
The skin found showed a negative effect on the production rate for S>0 and positive effect for S<0. Stimulation was proposed as a remedial action for the formation damage.
Significant increase in production rate was observed for possible stimulation effect on the damaged wells. Three wells were proposed for stimulation with 2L being badly damaged and 3L and 3S slightly damaged. The slightly damaged wells (3L and 3S) need not be stimulated immediately but future plans and provision should be made to avoid drastic drop in rate. 2L needs adequate stimulation to increase the flow rate. 2S shows stimulation has been done and successful with S= 3.33.
An assumption of reduced skin value after successful stimulation was made to prove the effect of stimulation on production rate. For well 2L, skin was reduced from 45 to 15 showing an increase in production of 963.757bbls (130.835% increase) at its flowing bottom-hole pressure. For well 3L, skin was reduced from 6.65 to 2 showing an increase in production of 665.965bbls (46.82% increase) at its flowing bottom-hole pressure. For well 3S, skin was reduced from 1.94 to 0 showing an increase in production of 314.941bbls (24.465% increase) at its flowing bottom-hole pressure.
The tool used (Saphir) is not 100% accurate, a better software should be used to analyze well test data which does not require excessive modification of result during analysis.
Further studies should be conducted to determine the best stimulation method that is cost effective and delivers a high rate. The quantity of materials required for the stimulation should be considered as well.
A comparative analysis should be done using small data range to detect percentage of accuracy between manual plotting, excel plotting and/ or Saphir along any other software tool.
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