Method and apparatus for effective well and reservoir evaluation without the need for well pressure history
AssigneeSchlumberger Technology Corporation
InventorBobby D. Poe
Life of this patent
Estimating the term…
Abstract
A method for evaluating well performance includes deriving a reservoir effective permeability estimate from data points in a production history, wherein the data points include dimensional flow rates and dimensional cumulative production, at least one of the data points has no sand face flowing pressure information; and deriving at least one reservoir property from the reservoir effective permeability estimate and the data points according to a well type and a boundary condition for a well that produced the production data.
Claims21
A method for evaluating well performance, comprising;
- deriving a reservoir effective permeability estimate from data points in a production history, wherein the data points include dimensional flow rates and dimensional cumulative production, at least one of the data points has no sand face flowing pressure information;
- and
- deriving at least one reservoir or well property from the reservoir effective permeability estimate and the data points according to a well type and a boundary condition for a well that produced the production data.
A method for evaluating well performance, comprising;
- deriving dimensionless flow rates and dimensionless cumulative production from dimensional flow rates and dimensional cumulative production data in a production history, wherein at least one data point in the production history includes pressure information and the deriving is based on a well type and a boundary condition;
- fitting a curve representing the dimensionless flow rates as a function of the dimensionless cumulative production to a plot of the dimensional flow rates versus the dimensional cumulative production;
- and
- obtaining a formation effective permeability estimate from the fitting.
A method for evaluating well performance, comprising;
- deriving a reservoir effective permeability estimate from early data points in a production history, the data points include dimensional flow rates and dimensional cumulative production, wherein no data point in the production history has sand face flowing pressure information, and the deriving is based on a model of an unfractured vertical well having an infinite-acting reservoir;
- and
- deriving at least one reservoir property from the reservoir effective permeability estimate and the production data according to a well type and a boundary condition for a well that produced the production data.
A system for evaluating well performance, comprising;
- a computer having a memory for storing a program, wherein the program includes instructions to perform:
- deriving a reservoir effective permeability estimate from data points in a production history, wherein the data points include dimensional flow rates and dimensional cumulative production, at least one of the data points has no sand face flowing pressure information;
- and
- deriving at least one reservoir or well property from the reservoir effective permeability estimate and the data points according to a well type and a boundary condition for a well that produced the production data.
Dependencies are inferred from the claim text.