Abstract:
Methods and apparatus for interrogating sets of optical elements having characteristic wavelengths spanning a sweep range while avoiding overlapping reflections from the different sets when performing a wavelength sweep are provided. One example method generally includes introducing a pulse of light, by an optical source, into an optical waveguide to interrogate at least first and second sets of optical elements, wherein the optical elements within each set have different characteristic wavelengths and wherein the first and second sets are separated in time such that a first time window over which light is reflected from the optical elements in the first set and reaches a receiver does not overlap with a second time window over which light is reflected from the optical elements in the second set and reaches the receiver; and processing the reflected light to determine one or more parameters corresponding to the optical elements.
Abstract:
Methods and apparatus for the collection, transportation, and analysis of gas samples which may be required in various scientific, environmental, and natural resource contexts is provided. An isolating container for removing a component from a fluid sample includes a body defining a sampling chamber having a first end and a second end; a first valve assembly coupled to the first end; a reactant material positioned within the sampling chamber for reacting with the component; and a second valve assembly coupled to the second end, wherein the fluid sample enters the sampling chamber through the first valve assembly and exits through the second valve assembly.
Abstract:
A method for cementing a tubular string into a wellbore from a drilling unit includes: running the tubular string into the wellbore using a workstring; hanging the tubular string from a wellhead or from a lower portion of a casing string set in the wellbore; and pumping cement slurry through the workstring and tubular string and into an annulus formed between the tubular string and the wellbore. The method further includes, during thickening of the cement slurry: circulating a liquid or mud through a loop closed by a seal engaged with an outer surface of the workstring, the closed loop being in fluid communication with the annulus, and periodically choking the liquid or mud, thereby pulsing the cement slurry.
Abstract:
A method and apparatus for steering a drilling assembly (200) during drilling operations for oil and gas. The steering assembly being disposed in a borehole (10) and comprising a drill bit (120) attached to a drill collar (210) having an eccentric stabilizer (220) disposed thereupon. The eccentric stabilizer either in an engaged state whereupon rotating concentrically with the drill collar, or in a released state whereupon as the drill collar rotates the eccentric stabilizer is positioned eccentrically relative to the drill collar creating a lateral deflection in the borehole that may be used for changing the direction of the drilling assembly.
Abstract:
A ball drop system is used to provide a visual indication and/or verification that a ball has been dropped from the ball drop system. The system includes a ball stack including a plurality of balls and a weighted member disposed on top of the balls. The system also includes a ball stack indicator including an inner magnet disposed within a tubular member and an outer magnet secured to an outer surface of the tubular member by a magnetic attraction to the inner magnet, the inner magnet being connected to the weighted member by a cable member.
Abstract:
The implementations described herein relate to imidazoline quaternary ammonium based compositions, processes for the preparation thereof and to the use of imidazoline quaternary ammonium based compositions as anti-agglomerants. In some implementations, the anti-agglomerant compositions described herein are able to handle greater than 10°C subcooling in a sour system up to 40,000 ppm H 2 S and also without the need for a hydrocarbon phase. It is believed that some of the anti-agglomerants described herein can function without a hydrocarbon phase in sour conditions.
Abstract translation:本文所述的实施方式涉及基于咪唑啉季铵的组合物,其制备方法以及咪唑啉季铵基组合物作为抗附聚剂的用途。 在一些实施方式中,本文所述的防粘结剂组合物能够在酸性体系中处理高达40,000ppm H 2 S并且也不需要烃相的大于10℃的过冷。 据信,本文所述的一些抗附聚剂可以在酸性条件下在没有烃相的情况下起作用。 p>
Abstract:
A sensing device is used for measuring physical characteristics. The sensing device may include an optical fiber disposed in a tube. The optical fiber may have a section containing a fiber Bragg grating (FBG) sensor. A support member may be coupled to the ends of the section, such that the section includes a length greater than a length of the portion of the support member disposed between the ends of the section. The support member is configured to isolate the FBG sensor from strain in the optical fiber.
Abstract:
A method of pressure testing a wellbore during a cementing operation includes positioning a tubular (10) within a wellbore, the tubular including a collar assembly (20) at a distal end of the tubular; urging cement through the collar assembly using a plug (60), the plug including a releasable sealing member (70, 70A, 70B, 70C); releasing the sealing member from the plug; sealing the collar assembly using the sealing member; and pressurizing the tubular to a predetermined test pressure and holding the predetermined test pressure for a predetermined time period. In another embodiment, a cementing plug for use with a collar assembly includes a plug body having a bore; and a releasable sealing member coupled to the bore, wherein sealing member is configured to engage and seal the collar assembly, after release.
Abstract:
A method of drilling a wellbore includes deploying a drill string into the wellbore through a casing string disposed in the wellbore. The casing string has a pressure responsive element and a hydraulic line in communication with the element and extending along the casing string. The method further includes: drilling the wellbore into a formation by injecting drilling fluid through the drill string and rotating a drill bit of the drill sting; and while drilling the formation, monitoring a pressure of the hydraulic line to ensure control of the formation.
Abstract:
A method and apparatus for determining a parameter of a production fluid in a wellbore by providing an initially blocked isolated communication path between a sensor and an aperture formed in a sleeve. The isolated communication path is subsequently unblocked to allow measurements of the parameter of the production fluid.