Mohammad. Sadehgi - Sience and research university of tehran
S. R. Shadizadeh - Petroleum university of technology

Shape Factor and drainage area in hydrocarbon reservoir are of the necessary and influencing factors on evaluation and optimization of drilling operation in oilfields. There are numerous methods to calculate the reservoir average pressure in conventional and sandstone reservoirs in that shape and drainage area of thereservoir are of important variables. On the other hand, these relations especially set for sandstone reservoirs and have limited usage in natural fracture reservoirs.This thesis presents a method to calculate shape and drainage area of wells in carbonated and natural fracture fields in all pressure and fluidity conditions. To doso, results of well testing are used both for development of inflow performancecurve and finding the drainage area. To make sure about the validity and preciseness of this method, it was investigated against the data from a well in a natural fracture field and the resultswere compared with those of other methods. Results indicated that the new method can provide us with more precise and correct answers for the shape of thewell in natural fracture reservoirs. The suggested method in this thesis needs production test data that has beenoptimized by well testing data for natural fracture reservoirs. Additionally, this method used draw down test and Tiab direct technique which is related to Walland Root solution. What's more, this method is reliable for all vertical wells in natural fracture reservoirs with accessible production test data and well testing

NFR: natural fracture reservoir, MBH method: Matthews, C.S, Browns F and Hazerbroek method, A: drainage area, CA: shape factor