Estimating Reservoir Properties from Falloff Tests Conducted with Thermally-Sensitive Injection Fluids

Abstract

A computer implemented method that enables reservoir characterization is described. The method includes obtaining bottom-hole pressure data and bottom-hole temperature data as an injection fluid is introduced into a well opened at bottom-hole to a host reservoir, followed by a shut-in of the well during an injection-falloff test. The method includes determining a mass rate of the injection fluid based on, at least in part, a wellhead fluid model and wellhead flow rate. The method includes determining bottom-hole flow rate data corresponding to wellhead flow rate data based on, at least in part, the mass rate and the bottom-hole fluid model.

What is claimed is: 
     
         1 . A computer-implemented method that enables estimating reservoir properties, comprising:
 obtaining, using at least one hardware processor, bottom-hole pressure data, a bottom-hole fluid model, and bottom-hole temperature data as an injection fluid is introduced into a well opened at bottom-hole to a host reservoir, followed by a shut-in of the well during an injection-falloff test;   determining, using the at least one hardware processor, a mass rate of the injection fluid based on, at least in part, a wellhead fluid model and wellhead flow rate; and   determining, using the at least one hardware processor, bottom-hole flow rate data corresponding to wellhead flow rate data based on, at least in part, the mass rate and the bottom-hole fluid model.   
     
     
         2 . The computer implemented method of  claim 1 , wherein the injection fluid is a thermally-sensitive injection fluid. 
     
     
         3 . The computer implemented method of  claim 1 , wherein input data is automatically rendered on a log-log plot to realize at least one flow regime. 
     
     
         4 . The computer implemented method of  claim 1 , wherein the bottom-hole flow rate and obtained bottom-hole pressure are used to characterize the host reservoir. 
     
     
         5 . The computer implemented method of  claim 4 , wherein characterizing the host reservoir comprises determining a size of the host reservoir, a shape of the host reservoir, an ability of the host reservoir to produce fluids, or any combinations thereof. 
     
     
         6 . The computer implemented method of  claim 1 , comprising synchronizing the bottom-hole pressure, the bottom-hole flow rate, and the bottom-hole temperature to enhance log-log diagnostics. 
     
     
         7 . The computer implemented method of  claim 1 , wherein the bottom-hole pressure and the bottom-hole temperature are obtained from at least one downhole gauge. 
     
     
         8 . The computer implemented method of  claim 1 , comprising tying the well into a production stream, wherein the well is managed in the production stream according to the operating strategy in force. 
     
     
         9 . An apparatus comprising a non-transitory, computer readable, storage medium that stores instructions that, when executed by at least one processor, cause the at least one processor to perform operations comprising:
 obtaining bottom-hole pressure data, a bottom-hole fluid model, and bottom-hole temperature data as an injection fluid is introduced into a well opened at bottom-hole to a host reservoir, followed by a shut-in of the well during an injection-falloff test;   determining a mass rate of the injection fluid based on, at least in part, a wellhead fluid model and wellhead flow rate; and   determining bottom-hole flow rate data corresponding to wellhead flow rate data based on, at least in part, the mass rate and the bottom-hole fluid model.   
     
     
         10 . The apparatus of  claim 9 , wherein the injection fluid is a thermally-sensitive injection fluid. 
     
     
         11 . The apparatus of  claim 9 , wherein input data is automatically rendered on a log-log plot to realize at least one flow regime. 
     
     
         12 . The apparatus of  claim 9 , wherein the bottom-hole flow rate and obtained bottom-hole pressure are used to characterize the host reservoir. 
     
     
         13 . The apparatus of  claim 12 , wherein characterizing the host reservoir comprises determining a size of the host reservoir, a shape of the host reservoir, an ability of the host reservoir to produce fluids, or any combinations thereof. 
     
     
         14 . The apparatus of  claim 9 , comprising synchronizing the bottom-hole pressure, the bottom-hole flow rate, and the bottom-hole temperature to enhance log-log diagnostics. 
     
     
         15 . The apparatus of  claim 9 , wherein the bottom-hole pressure and the bottom-hole temperature are obtained from at least one downhole gauge. 
     
     
         16 . A system, comprising:
 one or more memory modules;   one or more hardware processors communicably coupled to the one or more memory modules, the one or more hardware processors configured to execute instructions stored on the one or more memory modules to perform operations comprising:   obtaining bottom-hole pressure data, a bottom-hole fluid model, and bottom-hole temperature data as an injection fluid is introduced into a well opened at bottom-hole to a host reservoir, followed by a shut-in of the well during an injection-falloff test;   determining a mass rate of the injection fluid based on, at least in part, a wellhead fluid model and wellhead flow rate; and   determining bottom-hole flow rate data corresponding to wellhead flow rate data based on, at least in part, the mass rate and the bottom-hole fluid model.   
     
     
         17 . The system of  claim 16 , wherein the injection fluid is a thermally-sensitive injection fluid. 
     
     
         18 . The system of  claim 16 , wherein input data is automatically rendered on a log-log plot to realize at least one flow regime. 
     
     
         19 . The system of  claim 16 , wherein the bottom-hole flow rate and obtained bottom-hole pressure are used to characterize the host reservoir. 
     
     
         20 . The system of  claim 19 , wherein characterizing the host reservoir comprises determining a size of the host reservoir, a shape of the host reservoir, an ability of the host reservoir to produce fluids, or any combinations thereof.