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Triaxial thermopile array geo-heat-flow sensor
0375-6505/92 $5.00 + 0.00 Pergamon Press Ltd CNR.
Geothermics, Vol. 21, No. 5/6, pp. 1013-1014, 1992. Printed in Great Britain.
NEW PATENTS This section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent application filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the PATSEARCH ~ online database in accordance with interest profiles developed by the Editors. Further information about online patent searching can be obtained from Research on Demand, Inc., 2421 Fourth Street, Ste. C., Berkeley, CA 94710, U.S.A. [Tel. 510-841 1145; Fax 510-841 6311].
5119089 DOWNHOLE
SEISMIC CABLE
SENSOR
using temperature differences and Fourier's Law. The device is extremely sensitive with an accuracy of less than 0.1 Heat Flow Units (HFU) and may be used for long term readings.
H a n n a Khalil
5122554
A metallic down hole seismic sensor cable for operating at temperatures up to about 400 degrees F. and pressures up to about 5000 psig is provided. The seismic sensor cable includes a flexible metallic conduit sized for receiving a seismic sensor, and means for transmitting output generated by the seismic sensor. The cable is preferably constructed of stainless steel. An inert curable heat resistant material substantially fills the unoccupied spaces of the assembled seismic sensor cable.
5121993 TRIAXIAL THERMOPILE ARRAY GEO-HEAT-FLOW SENSOR Charles Carrigan, Harry Hardee, Gerald Reynolds, Terry Steinfort assigned to The United States of America as represented by the Department of Energy A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be encased in protective pvc tubing and includes a plurality of thermistors and an array of heat flow transducers arranged in a vertical string. The transducers produce voltage proportional to heat flux along the subsurface regime and permit direct measurement of heat flow in the subsurface regime. The presence of the thermistor array permits a comparison to be made between the heat flow estimates obtained from the transducers and heat flow calculated
ENHANCED POLYMER CONCRETE COMPOSITION William C Allen assigned to Union Oil Company of California A polymer concrete pipe liner is formed from a fluidized, but substantially waterless cement containing mixture applied to the pipe interior. The mixture is composed of inorganic cement particles, a liquid styrene mixture and a minor amount of one or more poly-olefinically unsaturated co-monomers. The mixture substantially excludes acrylonitrile and acrylamide. The co-monomers are preferable selected from a group including trimethylolpropane trimethacrylate, divinyl benzene, hexadiene, and polyvinylsiloxanes. Mixing the liquid and solid components forms a slurry which is transferred to a pipe interior. Transfer properties can be controlled by particulate gradation, dissolved polymers, and rheology control additives. The pipe is then spun to centrifugally cast the liner. The composition avoids the need for high temperature curing and toxic reactive unsaturates to copolymerize and cross-link polystyrene. Like the current polymer concrete materials, the materials embodied in the present invention have adequate strength at geothermal operating temperatures and reduced permeability, but they achieve this result without either a significant loss of broad spectrum chemical resistance to harsh geothermal environments or a large increase in cost. Other embodiments also incorporate the use of pozzolanic solids and high alumina cement to further improve chemical resistance characteristics. 1013
Geothermics, Vol. 21, No. 5/6, pp. 1013-1014, 1992. Printed in Great Britain.
NEW PATENTS This section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent application filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the PATSEARCH ~ online database in accordance with interest profiles developed by the Editors. Further information about online patent searching can be obtained from Research on Demand, Inc., 2421 Fourth Street, Ste. C., Berkeley, CA 94710, U.S.A. [Tel. 510-841 1145; Fax 510-841 6311].
5119089 DOWNHOLE
SEISMIC CABLE
SENSOR
using temperature differences and Fourier's Law. The device is extremely sensitive with an accuracy of less than 0.1 Heat Flow Units (HFU) and may be used for long term readings.
H a n n a Khalil
5122554
A metallic down hole seismic sensor cable for operating at temperatures up to about 400 degrees F. and pressures up to about 5000 psig is provided. The seismic sensor cable includes a flexible metallic conduit sized for receiving a seismic sensor, and means for transmitting output generated by the seismic sensor. The cable is preferably constructed of stainless steel. An inert curable heat resistant material substantially fills the unoccupied spaces of the assembled seismic sensor cable.
5121993 TRIAXIAL THERMOPILE ARRAY GEO-HEAT-FLOW SENSOR Charles Carrigan, Harry Hardee, Gerald Reynolds, Terry Steinfort assigned to The United States of America as represented by the Department of Energy A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be encased in protective pvc tubing and includes a plurality of thermistors and an array of heat flow transducers arranged in a vertical string. The transducers produce voltage proportional to heat flux along the subsurface regime and permit direct measurement of heat flow in the subsurface regime. The presence of the thermistor array permits a comparison to be made between the heat flow estimates obtained from the transducers and heat flow calculated
ENHANCED POLYMER CONCRETE COMPOSITION William C Allen assigned to Union Oil Company of California A polymer concrete pipe liner is formed from a fluidized, but substantially waterless cement containing mixture applied to the pipe interior. The mixture is composed of inorganic cement particles, a liquid styrene mixture and a minor amount of one or more poly-olefinically unsaturated co-monomers. The mixture substantially excludes acrylonitrile and acrylamide. The co-monomers are preferable selected from a group including trimethylolpropane trimethacrylate, divinyl benzene, hexadiene, and polyvinylsiloxanes. Mixing the liquid and solid components forms a slurry which is transferred to a pipe interior. Transfer properties can be controlled by particulate gradation, dissolved polymers, and rheology control additives. The pipe is then spun to centrifugally cast the liner. The composition avoids the need for high temperature curing and toxic reactive unsaturates to copolymerize and cross-link polystyrene. Like the current polymer concrete materials, the materials embodied in the present invention have adequate strength at geothermal operating temperatures and reduced permeability, but they achieve this result without either a significant loss of broad spectrum chemical resistance to harsh geothermal environments or a large increase in cost. Other embodiments also incorporate the use of pozzolanic solids and high alumina cement to further improve chemical resistance characteristics. 1013