Abstract: An apparatus includes a multi-spectral sensor and an image sensor. The multi-spectral sensor includes a spectrometer having at least a first optical filter and a second optical filter. The first optical filter includes a first lattice of nanowires having a first geometric property and configured to detect light within a first spectral band. The second optical filter includes a second lattice of nanowires having a second geometric property and configured to detect light within a second spectral band. The first spectral band and the second spectral band can at least partially define a spectral resolution of the spectrometer. The image sensor includes a first pixel configured to generate a first signal in response to receiving the light within the first spectral band, and a second pixel configured to generate a second signal in response to receiving the light within the second spectral band.

Abstract: Adjustable drill string housings are described for use in the directional drilling of wellbores, e.g. wellbores for hydrocarbon recovery wells. The adjustable drill string housings permit adjustment of a bend angle in the housings without removing the housings from a wellbore. In some exemplary embodiments, the bend angle can be adjusted by changing the internal stresses in a support member carried by the housings. In other embodiments, the bend angle may be adjusted by causing failure of sacrificial support members carried by the housings, and the failure may be caused by delivering chemicals through a chemical delivery system to the sacrificial support members. Methods of operating the adjustable drill string housings include multi-lateral drilling operations wherein the bend angle is adjusted when a casing window has been detected.

Abstract: Adjustable drill string housings are described for use in the directional drilling of wellbores, e.g. wellbores for hydrocarbon recovery wells. The adjustable drill string housings permit adjustment of a bend angle in the housings without removing the housings from a wellbore. In some exemplary embodiments, the bend angle can be adjusted by changing the internal stresses in a support member carried by the housings. In other embodiments, the bend angle may be adjusted by causing failure of sacrificial support members carried by the housings, and the failure may be caused by delivering chemicals through a chemical delivery system to the sacrificial support members. Methods of operating the adjustable drill string housings include multi-lateral drilling operations wherein the bend angle is adjusted when a casing window has been detected.