Injection wells
AssigneeGeomec Engineering Limited
InventorFrederic Joseph Santarelli
Life of this patent
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Abstract
A method for providing a well injection program in which injection testing is performed on an existing well which is intended to be an injection well in a field development. Water is injected into the well in a series of step rate tests or injection cycles, the data is modelled to determine thermal stress characteristics of the well and by reservoir modelling the optimum injection parameters are determined for the well injection program to provide for maximum recovery. The thermal stress characteristics are those that would previously have been obtained from core samples when the well was drilled. Further wells on a development can be tested and the individual thermal stress characteristics of each well combined in the reservoir model for optimized field development.
Claims20
A method for a well injection program, comprising the steps:
- (a) injecting a fluid into the well;
- (b) varying the flow rate of injected fluid;
- (c) measuring the pressure, temperature and flow rate at the well as the flow rate is varied to provide measured data;
- (d) fitting a first model to the measured data to estimate one or more thermal stress characteristics of the well;
- (e) inputting the one or more thermal stress characteristics into a second model;
- (f) determining injection parameters from the second model;
- and
- further including the step of measuring pressure for different temperatures of injected fluid.
A method for a well injection program, comprising the steps:
- (a) injecting a fluid into the well;
- (b) varying the flow rate of injected fluid;
- (c) measuring the pressure, temperature and flow rate at the well as the flow rate is varied to provide measured data;
- (d) fitting a first model to the measured data to estimate one or more thermal stress characteristics of the well;
- (e) inputting the one or more thermal stress characteristics into a second model;
- and
- (f) determining injection parameters from the second model;
- and further including the step of measuring the pressure and flow rate during a first injection cycle and determining fracturing has occurred.
Dependencies are inferred from the claim text.