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US 2004/0016295 A1Published application
Subterranean well pressure and temperature measurement
AssigneeHalliburton Energy Services, Inc.
InventorsNeal G. Skinner, John R. Dennis, Michel Leblanc, Gregg Johnson, Michael D. Todd
Life of this patent
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Abstract
A well pressure and temperature measurement system and method are provided. In a described embodiment, a sensor system includes multiple strain sensors attached to a structure which changes dimensionally in response to well pressure and temperature changes. The strain sensors may be fiber optic sensors. The structure may be tubular and the strain sensors may detect axial and hoop strains in the structure.
Claims105
A subterranean well sensor system, comprising:
- a structure in which strain is induced in response to a pressure differential in the well;
- and
- first and second strain sensors attached to the structure and detecting strain in the structure when the pressure differential exists in the well, the first strain sensor detecting a first strain in a first direction in the structure, and the second strain sensor detecting a second strain in a second direction in the structure.
A subterranean well sensor system, comprising:
- a generally tubular structure having a pressure differential applied across its inner and outer surfaces, the pressure differential existing between well pressure applied to one of the inner and outer surfaces and a second predetermined pressure applied to the other of the inner and outer surfaces;
- and
- first and second strain sensors, each of the first and second strain sensors detecting strain in the structure induced by the pressure differential and strain induced in the structure by a temperature change in the well, the first strain sensor detecting strain in the structure in a first direction, and the second strain sensor detecting strain in the structure in a second direction different from the first direction.
A subterranean well sensor system, comprising:
- a structure having a pressure differential applied across a membrane of the structure, the pressure differential existing between well pressure applied to a first side of the membrane and a second predetermined pressure applied to a second side of the membrane;
- and
- first and second strain sensors, each of the first and second strain sensors detecting strain in the membrane induced by the pressure differential and strain induced in the membrane by a temperature change in the well, the first strain sensor detecting strain in the membrane in a first direction, and the second strain sensor detecting strain in the membrane in a second direction different from the first direction.
A subterranean well sensor system, comprising:
- a structure having first and second portions, a pressure differential applied across the first portion, the pressure differential existing between well pressure applied to a first surface of the first portion and a second predetermined pressure applied to a second surface of the first portion;
- and
- first and second strain sensors, each of the first and second strain sensors detecting strain in the structure induced by a temperature change in the well, the first strain sensor detecting strain in the first portion induced by the pressure differential, and the second strain sensor detecting strain in the second portion induced by the temperature change but not detecting strain in the second portion induced by the pressure differential.
A method of measuring pressure in a subterranean well, the method comprising the steps of:
- applying a pressure differential across a structure positioned in the well;
- detecting a first strain in the structure in a first direction using a first strain sensor;
- detecting a second strain different from the first strain in the structure in a second direction using a second strain sensor;
- and
- calculating the pressure differential using a predetermined mathematical relationship between the pressure differential and the first and second strains.
2 more elements
A method of measuring pressure in a subterranean well, the method comprising the steps of:
- applying a pressure differential across a structure positioned in the well;
- applying a temperature change to the structure in the well;
- detecting a first strain in the structure induced by the pressure differential and the temperature change using a first strain sensor;
- detecting a second strain in the structure induced by the temperature change using a second strain sensor, the second strain sensor not detecting strain induced in the structure by the pressure differential;
- and
- a predetermined mathematical relationship existing between the pressure differential and the first and second strains.
3 more elements
A method of measuring pressure in a subterranean well, the method comprising the steps of:
- applying a pressure differential across a structure positioned in the well;
- applying a temperature change to the structure in the well;
- detecting a first strain in the structure induced by the pressure differential and the temperature change using a first strain sensor;
- detecting a second strain different from the first strain in the structure induced by the pressure differential and the temperature change using a second strain sensor;
- and
- a predetermined mathematical relationship existing between the pressure differential and the first and second strains.
3 more elements
Dependencies are inferred from the claim text.