Predicting Subsurface Safety Valve Leak Rates
AssigneeSaudi Arabian Oil Company
InventorsBanowo Dwiyonoloka, Mohammed Baqer Alali
Life of this patent
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Abstract
A computer-implemented method that predicts a subsurface safety valve leak rate is described. The method includes predicting pressure changes at a trapped cavity associated with a subsurface safety valve of a shut-in well, an offset temperature at a depth of the subsurface safety valve, and gas compressibility factors over time. A leak rate at the subsurface safety valve is calculated in real time based on the predicted pressure changes, the predicted offset temperature, and the predicted gas compressibility factors.
Claims20
A computer-implemented method that predicts a subsurface safety valve leak rate, comprising:
- predicting pressure changes at a trapped cavity associated with a subsurface safety valve of a shut-in well based on a pressure and a temperature captured at the well, wherein the pressure changes comprise an initial pressure and an ending pressure at the trapped cavity;
- predicting an offset temperature at a depth of the subsurface safety valve;
- predicting gas compressibility factors over time based on the initial pressure at the trapped cavity and the ending pressure at the trapped cavity;
- and
- calculating a leak rate at the subsurface safety valve based on the predicted pressure changes, the predicted offset temperature, and the predicted gas compressibility factors.
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:
- predicting pressure changes at a trapped cavity associated with a subsurface safety valve of a shut-in well based on a pressure and a temperature captured at the well, wherein the pressure changes comprise an initial pressure and an ending pressure at the trapped cavity;
- predicting an offset temperature at a depth of the subsurface safety valve;
- predicting gas compressibility factors over time based on the initial pressure at the trapped cavity and the ending pressure at the trapped cavity;
- and
- calculating a leak rate at the subsurface safety valve based on the predicted pressure changes, the predicted offset temperature, and the predicted gas compressibility factors.
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:
- predicting pressure changes at a trapped cavity associated with a subsurface safety valve of a shut-in well based on a pressure and a temperature captured at the well, wherein the pressure changes comprise an initial pressure and an ending pressure at the trapped cavity;
- predicting an offset temperature at a depth of the subsurface safety valve;
- predicting gas compressibility factors over time based on the initial pressure at the trapped cavity and the ending pressure at the trapped cavity;
- and
- calculating a leak rate at the subsurface safety valve based on the predicted pressure changes, the predicted offset temperature, and the predicted gas compressibility factors.
Dependencies are inferred from the claim text.