Method for determining an inflow profile in a multilayer well

Abstract

A bottomhole temperature and a bottomhole pressure in a well are measured by means of sensors mounted on a perforation string below all perforation intervals. The measurements are made prior to perforating the well and after perforating the well until a temperature of a produced fluid returns to an initial reservoir temperature. Then the temperature of the produced fluid is measured by means of temperature sensors mounted on the perforation string above each perforation interval and a total production rate of the well is estimated. An excessive thermal energy of the produced fluid is calculated for each temperature sensor mounted on the perforation string above the perforation intervals and production rates of the individual perforation intervals are determined based on the calculated excessive thermal energies of the produced fluid and the known number of perforating charges in each perforation interval.

1 . A method for determining a fluid inflow profile in a multilayer well, the method comprising:
 measuring a bottomhole temperature and a bottomhole pressure in a well by means of sensors mounted on a perforation string below all perforation intervals, wherein the measurements are made prior to perforating the well and after perforating the well until a temperature of a produced fluid returns to an initial reservoir temperature,   measuring the temperature of the produced fluid by means of temperature sensors mounted on the perforation string above each perforation interval,   estimating a total production rate of the well,   calculating an excessive thermal energy of the produced fluid for each temperature sensor mounted on the perforation string above the perforation intervals, and   determining production rates of the individual perforation intervals based on the calculated excessive thermal energies of the produced fluid and the known number of perforating charges in each perforation interval.   
     
     
         2 . The method of  claim 1 , wherein the total production rate of the well is determined by measuring a flow rate at the surface or in the well. 
     
     
         3 . The method of  claim 1 , wherein the total production of the well is determined by calculating a flow rate based on the change in the bottomhole pressure. 
     
     
         4 . The method of  claim 1 , wherein the total production of the well is determined by calculating a flow rate using the bottomhole pressure and numerically simulating the multilayer exploitation well.