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Increasing the Pressure Ratio of the Fluid Diode Type Autonomous Inflow Control Device

IP.com Disclosure Number: IPCOM000243085D
Publication Date: 2015-Sep-14
Document File: 2 page(s) / 197K

Publishing Venue

The IP.com Prior Art Database

Abstract

Autonomous inflow control devices (AICDs) are a relatively new technology to the oil field. These devices are designed to improve upon the function of a passive inflow control device (ICD) in that they are able to autonomously change the resistance to flow based on the properties of the fluid flowing through them. The type of AICD being improved in this discussion is a fluid diode type device. This type of device utilizes the spinning of the fluid to create an increased pressure drop for unwanted fluids flowing through the device. The device has specially designed fluidic pathways that direct the fluid to spin or not to spin based on the properties of the fluid entering the device. In this application, higher viscosity oil does not tend to spin, while low viscosity water spins at a very high rate. The difference in the spinning velocity between the two fluids leads to a large pressure ratio between water and oil when comparing at the same flow rate. The advantage of a large pressure ratio between water and oil is that the device is able to significantly reduce the production of water compared to the oil production. This reduction in the water flow rate allows oil rich zones to continue to produce and the watered out zones to slow down significantly. For more details about how the fluidic diode type AICD operates, reference SPE 167415. This paper describes an improvement upon the current design.

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Increasing the Pressure Ratio of the Fluid Diode Type Autonomous Inflow Control Device

Abstract

Autonomous inflow control devices (AICDs) are a relatively new technology to the oil field. These devices are designed to improve upon the function of a passive inflow control device (ICD) in that they are able to autonomously change the resistance to flow based on the properties of the fluid flowing through them. The type of AICD being improved in this discussion is a fluid diode type device. This type of device utilizes the spinning of the fluid to create an increased pressure drop for unwanted fluids flowing through the device. The device has specially designed fluidic pathways that direct the fluid to spin or not to spin based on the properties of the fluid entering the device. In this application, higher viscosity oil does not tend to spin, while low viscosity water spins at a very high rate. The difference in the spinning velocity between the two fluids leads to a large pressure ratio between water and oil when comparing at the same flow rate. The advantage of a large pressure ratio between water and oil is that the device is able to significantly reduce the production of water compared to the oil production. This reduction in the water flow rate allows oil rich zones to continue to produce and the watered out zones to slow down significantly. For more details about how the fluidic diode type AICD operates, reference SPE 167415. This paper describes an improvement upon the current design.

Design Improvement

Disclosed below is a method to increase the pressure ratio between the low viscosity, undesired fluid, water or gas versus the high viscosity, desired fluid, oil. Since the fluidic diode creates a high pressure drop by spinning the fluid at a high rate, it is evident that this pressure drop can be further increased if the angular velocity difference between the two fluids was increased.

According to the conservation law of angular momentum, the fluid will increase its angular velocity as it approaches the exit nozzle. This can be seen in the computational fluid dyn...