Abstract: A method and sealant to seal microcracks as small as 50 ?m by causing methyl methacrylate combined with one or more nanoparticles to flow into the microcrack to be sealed.

Abstract: A system and method for powering a borehole sensor with thermal energy is disclosed. The system includes a tubular pipe inserted into a subsurface borehole. A borehole casing is coaxially disposed with the tubular pipe. An annular space between the casing and the tubular pipe has a power source placed in the borehole to power a sensor in response to a temperature gradient between a surface of the casing and a surface of the tubular pipe. The method includes attaching thermopiles on the borehole casing or tubing; placing the thermopile in the annulus between the casing and the tubing; inducing a thermal gradient across the thermopile; generating an electrical energy in response to the temperature gradient; powering the sensor from the generated energy; and monitoring vertical expansion of a CO2 plume.

Abstract: Placement of proppant in subterranean formations during hydraulic fracturing is assessed. A method of one aspect includes introducing a hydraulic fracturing fluid including a proppant into a subterranean formation through a well. Samples of the hydraulic fracturing fluid are recovered through the well over a period of time. A concentration of at least one tracer in each of the samples is determined. The concentrations of the at least one tracer in the samples are analyzed to assess placement of the proppant in the subterranean formation. Other methods, apparatus, and systems are also disclosed.

Abstract: A method and sealant to seal microcracks as small as 50 ?m by causing methyl methacrylate combined with one or more nanoparticles to flow into the microcrack to be sealed.

Abstract: A method and sealant to seal microcracks as small as 30 ?m by causing methyl methacrylate combined with one or more nanoparticles to flow into the microcrack to be sealed.

Abstract: A sensor having one or more stopbands and method of using the same for detecting damage, cracking and debonding in a cement structure comprising a cementitious material and a plurality of periodic structures located in the cementitious material.

Abstract: A method and sealant to seal microcracks as small as 30 ?m by causing methyl methacrylate combined with one or more nanoparticles to flow into the microcrack to be sealed.

Abstract: A method for geo-sequestration of a carbon dioxide includes selection of a target water-laden geological formation with low-permeability interbeds, providing an injection well into the formation and injecting supercritical carbon dioxide (SC-CO2) and water or bine into the injection well under conditions of temperature, pressure and density selected to cause the fluid to enter the formation and splinter and/or form immobilized ganglia within the formation.

Abstract: A method for geo-sequestration of a carbon dioxide includes selection of a target water-laden geological formation with low-permeability interbeds, providing an injection well into the formation and injecting supercritical carbon dioxide (SC—CO2) and water or bine into the injection well under conditions of temperature, pressure and density selected to cause the fluid to enter the formation and splinter and/or form immobilized ganglia within the formation.

Abstract: A method for geo-sequestration of a carbon dioxide includes selection of a target water-laden geological formation with low-permeability interbeds, providing an injection well into the formation and injecting supercritical carbon dioxide (SC—CO2) into the injection well under conditions of temperature, pressure and density selected to cause the fluid to enter the formation and splinter and/or form immobilized ganglia within the formation. This process allows for the immobilization of the injected SC—CO2 for very long times. The dispersal of scCO2 into small ganglia is accomplished by alternating injection of SC—CO2 and water. The injection rate is required to be high enough to ensure the SC—CO2 at the advancing front to be broken into pieces and small enough for immobilization through viscous instability.