Abstract: A composition includes a crosslinked product of a polyphenylene sulfide and a polyphenylsulfone. A method for the manufacture of the crosslinked product of a polyphenylene sulfide and a polyphenylsulfone includes heating the polyphenylene sulfide and the polyphenylsulfone in presence of a crosslinking agent at a temperature and for a time effective to form the crosslinked product of polyphenylene sulfide and polyphenylsulfone.

Abstract: A downhole element to isolate or complete a wellbore includes a shape memory material including polyphenylene sulfide. The polyphenylene sulfide is the cure product of being cured at a temperature of about 200° C. to about 400° C., for a total time of less than or equal to 200 hours. The shape memory material is thermally activated between an actuated and unactuated shape, and the polyphenylene sulfide in the shape memory material is a closed cell foam, open cell foam, or solid.

Abstract: A flow control device and a method of controlling a flow, the flow control device including a flow path for a fluid therethrough and a material at least partially defining the flow path, the material operatively arranged with a surface energy less than that of the fluid for passively impeding an undesirable component of the fluid more than a desirable component of the fluid.

Abstract: A thermoplastic material comprises the cure product of a thermoplastic polymer having a thermal decomposition temperature greater than or equal to about 200° C., the thermoplastic polymer being cured at a temperature of about 200° C. to about 400° C., for a total time of less than or equal to 200 hours. An article is formed from the thermoplastic material.

Abstract: A method of preparing a cured thermoplastic material includes curing a thermoplastic polymer having a thermal decomposition temperature greater than or equal to about 200° C., at a temperature of about 200° C. to about 400° C., for a total time of less than or equal to 200 hours. A method of making a shape memory material also includes curing a thermoplastic polymer to prepare a cured thermoplastic material.

Abstract: The present invention is directed to a fluoropolymer tape having an electrically conductive surface. More specifically, the present invention is directed to a polytetrafluoroethylene (PTFE) tape and method for producing an electrically conductive tape by blending vapor-grown carbon fiber or carbon nanotubes or combinations of both with PTFE.

Abstract: The present invention is directed to a fluoropolymer tape having an electrically conductive surface. More specifically, the present invention is directed to a polytetrafluoroethylene (PTFE) tape and method for producing an electrically conductive tape by blending vapor-grown carbon fiber or carbon nanotubes or combinations of both with PTFE.

Abstract: The present invention is directed to a fluoropolymer tape having an electrically conductive surface. More specifically, the present invention is directed to a polytetrafluoroethylene (PTFE) tape and method for producing an electrically conductive tape by blending vapor-grown carbon fiber or carbon nanotubes or combinations of both with PTFE.

Abstract: Explicit constrained depth extrapolation operators are constructed with variable operator lengths depending on maximum phase angles, accuracy condition, anisotropy parameters, and wavenumber. Operator tables are constructed using the explicit depth extrapolation operator having the smallest operator length satisfying the accuracy condition at the maximum phase angles for each of a plurality of anisotropy parameters and a plurality of wavenumbers. Depth migration is performed using the explicit constrained depth extrapolation operator at a depth having the smallest operator length from the operator tables for the wavenumber.

Abstract: A seismic wavefield is extrapolated using variable extrapolation step size and then phase-shifted linear interpolation is applied to the extrapolated wavefield.

Abstract: A method is disclosed for determining interval anisotropic parameters. The method includes determining normal moveout (NMO) velocities and effective anelliptical parameters from seismic data traces. The NMO velocities are processed to obtain interval NMO velocities. The NMO velocities, effective anelliptical parameters and interval NMO velocities are inverted to obtain the interval anisotropic parameters. In one embodiment, the inversion includes damped least squares. In one embodiment, the inversion is preconditioned.

Abstract: A seismic wavefield is extrapolated using variable extrapolation step size and then phase-shifted linear interpolation is applied to the extrapolated wavefield.

Abstract: The present invention is directed to a fluoropolymer tape having an electrically conductive surface. More specifically, the present invention is directed to a polytetrafluoroethylene (PTFE) tape and method for producing an electrically conductive tape by blending vapor-grown carbon fiber or carbon nanotubes or combinations of both with PTFE.

Abstract: A method is disclosed for determining interval anelliptical parameters. The method includes determining normal moveout velocities and effective anelliptical parameters from seismic data traces. The normal moveout velocities are processed to obtain interval velocities. The normal moveout velocities, effective anelliptical parameters and interval velocities are inverted to obtain the interval anelliptical parameters. In one embodiment, the inversion includes damped least squares. In one embodiment, the inversion is preconditioned.

Abstract: Recursive f-k migration of a body of seismic data performed in N stages, including establishing from an RMS velocity VRMS a laterally-averaged interval velocity profile extending from a surface at time zero to time t; determining layer boundaries within the laterally averaged interval velocity profile, including identifying a unique set of pairs of depth and vertical travel time giving rise to a minimum sum of squares of residuals for the layers; calculating reference velocities for each layer; time-stretching the entire body of seismic data; performing, upon the data in each layer of the body of seismic data not yet fully migrated, recursive stages of f-k migration, including using as input to a current recursive migration stage that portion of the output from a previous recursive migration stage that comprises data partially migrated; and inversely time-stretching the entire body of seismic data.

Abstract: A method of migrating seismic event data in the presence of a vertically time-varying velocity field defined by a migration velocity function is provided. The method comprises approximating a migration velocity function by constant stepwise stage velocities. The seismic event data is time stretched and is then successively migrated using residual velocities. After the seismic event data is fully migrated, the effect of time stretching is removed by time unstretching the fully migrated seismic event data by a reverse operation to obtain a finally migrated seismic event data.

Abstract: A method of migrating seismic event data in the presence of a vertically time-varying velocity field defined by a migration velocity finction is provided. The method comprises approximating a migration velocity function by constant stepwise stage velocities. The seismic event data is time stretched and is then successively migrated using residual velocities. After the seismic event data is fully migrated, the effect of time stretching is removed by time unstretching the fully migrated seismic event data by a reverse operation to obtain a finally migrated seismic event data.