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Electronics Cooling Using Vortex Tubes & Turbomachinery for High Temperature Application

IP.com Disclosure Number: IPCOM000237587D
Publication Date: 2014-Jun-25
Document File: 4 page(s) / 149K

Publishing Venue

The IP.com Prior Art Database

Abstract

The search for oil and gas is being pushed to extreme environments as global demand for energy continues to rise. The decline in availability of easy reservoirs has led the operators to drill more challenging unconventional wells with higher depth, temperature and pressure. This poses new challenges for drilling and evaluation technology because performance of electronics, seals and elastomers suffers or degrades at high temperature. Maintaining stability of mud properties at high temperature is also challenging. Failure of electronics in the drilling system is a major contributor to cost in terms of R&M cost, penalties associated with downtime and non-productive time (> 1 billion USD). Temperature is a major cause of failure for electronics. Most electronics used in drilling systems are certified to operate around 125C; however these limits are being pushed for high temperature application with temperatures above 200C.This idea is about developing a mechanical cooling device in the drilling system using vortex tubes and compressed air. A vortex tube is a simple mechanical device that achieves cooling by swirling and separating jet of pressurized fluid into hot and cold streams. This describes a multistage mechanical device to achieve cooling using MUD powered turbomachinery and vortex tube. The cold stream of air produced by the vortex tube can be used to cool the electronics inside the BHA and the hot stream can be dissipated into the bore hole or recirculated back to the surface. The cooling system described in this disclosure will have high reliability and low maintenance cost since it does not have any many moving parts, does not require electricity or any other input except compressed air.

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Title:

Electronics Cooling Using Vortex Tubes & Turbomachinery for High Temperature Application

Abstract:

The search for oil and gas is being pushed to extreme environments as global demand for energy continues to rise. The decline in availability of easy reservoirs has led the operators to drill more challenging unconventional wells with higher depth, temperature and pressure. This poses new challenges for drilling and evaluation technology because performance of electronics, seals and elastomers suffers or degrades at high temperature. Maintaining stability of mud properties at high temperature is also challenging. Failure of electronics in the drilling system is a major contributor to cost in terms of R&M cost, penalties associated with downtime and non-productive time (> 1 billion USD). Temperature is a major cause of failure for electronics. Most electronics used in drilling systems are certified to operate around 125C; however these limits are being pushed for high temperature application with temperatures above 200C.This idea is about developing a mechanical cooling device in the drilling system using vortex tubes and compressed air. A vortex tube is a simple mechanical device that achieves cooling by swirling and separating jet of pressurized fluid into hot and cold streams. This describes a multistage mechanical device to achieve cooling using MUD powered turbomachinery and vortex tube. The cold stream of air produced by the vortex tube can be used to cool the electronics inside the BHA and the hot stream can be dissipated into the bore hole or recirculated back to the surface. The cooling system described in this disclosure will have high reliability and low maintenance cost since it does not have any many moving parts, does not require electricity or any other input except compressed air.

Description:

For this mechanism to work some design changes will have to be made to the BHA.

(1) An additional compressed air sub will need to be placed close to the BHA. This sub will house the compressed air cylinder and associated valves and delivery mechanism to the cooling system (2) Cooling apparatus containing vortex tube(s) will have to be added. This sub will receive compressed air and produce stream of cold air that will be transferred to electronics in BHA.

(3) The compartments housing the electronics will have to be modified to receive the cool air from the vortex tubes. This will require carving/machining flow channels in the metal body of the housing (4) The protective packaging around electronic circuit boards (Q-packs) will need to have heat-transfer surface like fins to enhance heat exchange

Justification for use of components shown in the Figures


(a) Air storage tank: Pressurized air is the primary ingredient for this cooling


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mechanism. Air can be supplied to the cooling mechanism in two ways (1) pumped from the surface (2) carried in a storage tank. Ideally, pressurized air may be transported from the surface without affecting functionality of drilling system and would not require a major redesign of drilling system.. However option (2) air storage tank is still required to allow fail-safe.

(b) Axial Compressor: Efficien...