Nahr Umr reservoirs in Bahrain Field consist of three reservoirs (Cab, Cc and Cd) that vary from ... more Nahr Umr reservoirs in Bahrain Field consist of three reservoirs (Cab, Cc and Cd) that vary from calcareous silt stones to sand stones. They are the second major producing zones in Bahrain Field and are overlain by Mauddud limestone reservoir separated by 8-10' shale. All these reservoirs have been on production since early thirties and Mauddud reservoir has been under gas injection since 1938. These reservoirs with diverse fluid contents and hydro-dynamically different systems communicate with each other through the extensive faulting. Based on a dynamic model, it shows significant amount of flux already had transfered from the Mauddud reservoir to Cab due to gravity drainage gas injection project in the faulted crestal part of the Mauddud reservoir. Furthermore, the high recovery in Nahr Umr Cab reservoir indicates of acting as drainage point from Mauddud supported by the differential pressure in some areas.For such mature reservoirs with a long production history, identifying bypassed oil, underperforming areas, areas under communication, locating infill wells and upgrading the reserves are challenging tasks.
The Light Oil Steam Flood (LOSF) is proposed to increase the recovery from Mauddud reservoir in B... more The Light Oil Steam Flood (LOSF) is proposed to increase the recovery from Mauddud reservoir in Bahrain Field. Mauddud has been on gas injection since 1938, yet residual oil saturation is still high in the gas cap due to its oil wettability. Several core lab studies were conducted confirming the high oil saturation in the gas cap. Steam flood core lab experiments were conducted recently and confirmed the residual oil saturation could reach to less than 10%. The thermal pilot project in Mauddud has gone through the following stages:
This paper presents a new way to numerically simulate flow in Dual Porosity-Dual Permeability sys... more This paper presents a new way to numerically simulate flow in Dual Porosity-Dual Permeability system which is solved rigorously with wellbore storage and skin. This paper shows that the use of Orthogonal Collocation method is feasible and that, in many cases, it results in solutions that are more realistic than those resulted from numerical inversion of Laplace transform. There are, however, certain disadvantages. For example, oscillation of the pressure derivative which can be overcome by using Orthogonal Collocation on Finite Element (OCFE) in which programming effort are usually in excess of that required by a finite-difference or numerical Laplace inversion scheme. Even so, it is felt that the potential of the technique is sufficient justification for this work and for a continuing effort to apply it to well test simulation problems. Dual Porosity-Dual Permeability well testing problem is described by a complex set of nonlinear partial differential equations. Their solution is normally achieved analytically using Laplace transform or numerically through the use of numerical inverting methods of the Laplcace transform like Stehfest and Crump. This paper is an extension to the paper SPE 120668 that introduced the method for the basic well test problem. The primary objective of this paper is to investigate the feasibility of using Orthogonal Collocation on well test in Dual Porosity-Dual Permeability system. Since this work was primarily concerned with the feasibility of Orthogonal Collocation simulation, no attempt was made to study a wide spectrum of cases of well test problems. However, a few typical applications are presented and some of the results are compared with those derived from analytical and numerical inversion.
Copyright 2010, Society of Petroleum Engineers This paper was prepared for presentation at the SP... more Copyright 2010, Society of Petroleum Engineers This paper was prepared for presentation at the SPE Deep Gas Conference and Exhibition held in Manama, Bahrain, 2426 January 2010. This paper was selected for presentation by an SPE program committee following ...
SPE Middle East Oil and Gas Show and Conference, 2009
... In the original orthogonal collocation reference (Villadsen and Stewart, 196710), the authors... more ... In the original orthogonal collocation reference (Villadsen and Stewart, 196710), the authors had illustrated three example tables for collocation point ... The OCFE technique, first developed by Carey and Finlayson (1975) 13 has been employed successfully where the global ...
Nahr Umr reservoirs in Bahrain Field consist of three reservoirs (Cab, Cc and Cd) that vary from ... more Nahr Umr reservoirs in Bahrain Field consist of three reservoirs (Cab, Cc and Cd) that vary from calcareous silt stones to sand stones. They are the second major producing zones in Bahrain Field and are overlain by Mauddud limestone reservoir separated by 8-10' shale. All these reservoirs have been on production since early thirties and Mauddud reservoir has been under gas injection since 1938. These reservoirs with diverse fluid contents and hydro-dynamically different systems communicate with each other through the extensive faulting. Based on a dynamic model, it shows significant amount of flux already had transfered from the Mauddud reservoir to Cab due to gravity drainage gas injection project in the faulted crestal part of the Mauddud reservoir. Furthermore, the high recovery in Nahr Umr Cab reservoir indicates of acting as drainage point from Mauddud supported by the differential pressure in some areas.For such mature reservoirs with a long production history, identifying bypassed oil, underperforming areas, areas under communication, locating infill wells and upgrading the reserves are challenging tasks.
The Light Oil Steam Flood (LOSF) is proposed to increase the recovery from Mauddud reservoir in B... more The Light Oil Steam Flood (LOSF) is proposed to increase the recovery from Mauddud reservoir in Bahrain Field. Mauddud has been on gas injection since 1938, yet residual oil saturation is still high in the gas cap due to its oil wettability. Several core lab studies were conducted confirming the high oil saturation in the gas cap. Steam flood core lab experiments were conducted recently and confirmed the residual oil saturation could reach to less than 10%. The thermal pilot project in Mauddud has gone through the following stages:
This paper presents a new way to numerically simulate flow in Dual Porosity-Dual Permeability sys... more This paper presents a new way to numerically simulate flow in Dual Porosity-Dual Permeability system which is solved rigorously with wellbore storage and skin. This paper shows that the use of Orthogonal Collocation method is feasible and that, in many cases, it results in solutions that are more realistic than those resulted from numerical inversion of Laplace transform. There are, however, certain disadvantages. For example, oscillation of the pressure derivative which can be overcome by using Orthogonal Collocation on Finite Element (OCFE) in which programming effort are usually in excess of that required by a finite-difference or numerical Laplace inversion scheme. Even so, it is felt that the potential of the technique is sufficient justification for this work and for a continuing effort to apply it to well test simulation problems. Dual Porosity-Dual Permeability well testing problem is described by a complex set of nonlinear partial differential equations. Their solution is normally achieved analytically using Laplace transform or numerically through the use of numerical inverting methods of the Laplcace transform like Stehfest and Crump. This paper is an extension to the paper SPE 120668 that introduced the method for the basic well test problem. The primary objective of this paper is to investigate the feasibility of using Orthogonal Collocation on well test in Dual Porosity-Dual Permeability system. Since this work was primarily concerned with the feasibility of Orthogonal Collocation simulation, no attempt was made to study a wide spectrum of cases of well test problems. However, a few typical applications are presented and some of the results are compared with those derived from analytical and numerical inversion.
Copyright 2010, Society of Petroleum Engineers This paper was prepared for presentation at the SP... more Copyright 2010, Society of Petroleum Engineers This paper was prepared for presentation at the SPE Deep Gas Conference and Exhibition held in Manama, Bahrain, 2426 January 2010. This paper was selected for presentation by an SPE program committee following ...
SPE Middle East Oil and Gas Show and Conference, 2009
... In the original orthogonal collocation reference (Villadsen and Stewart, 196710), the authors... more ... In the original orthogonal collocation reference (Villadsen and Stewart, 196710), the authors had illustrated three example tables for collocation point ... The OCFE technique, first developed by Carey and Finlayson (1975) 13 has been employed successfully where the global ...
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