摘要:
A method for determining the location of a tubular string or downhole component in a wellbore including placing a tubular string (315) into a wellbore (310) having at least one radioactive source (400), the tubular string having a depth measurement module (102) and obtaining a plurality of downhole parameter measurements, wherein at least one downhole parameter is a function of depth. The method also includes obtaining a plurality of radiation intensity measurements and determining a length change, L Δ , of the tubular string in the wellbore utilized in order to obtain the plurality of downhole parameter measurements and the plurality of radiation intensity measurements. The method also includes determining the location of the depth measurement module in the wellbore based on a correlation of the plurality of downhole parameter measurements, the plurality of radiation intensity measurements, and the length change L Δ of the tubular string in the wellbore.
摘要:
Un capteur de pression (20) comporte une membrane déformable (22) qui obture de façon étanche un passage de fluide (18). Afin de protéger la membrane (22) contre les chocs, le passage (18) comprend une restriction (44) dont les dimensions sont déterminées de façon à limiter le pic de pression appliqué sur la membrane à une valeur de coupure supportable par cette membrane. La restriction (44) peut être formée dans un tube capillaire démontable (42) ou se présenter sous la forme de rainures réalisées dans une plaquette de silicium intégrée à la partie active du capteur.
摘要:
Circuit électrique tel qu'un pont de Wheatstone composé de résistances (7 à 10) reliées par des élargissements de piste (11 à 14). Les élargissements reliés à un appareil de mesure (V) de grande impédance comprennent des tronçons à résistance ajustable (17, 18). Comme les élargissements (12 et 14) s'élargissent essentiellement vers ces tronçons, aucun courant sensible ne passe par les segments de brins coupés dont l'extrémité a subi une altération de sa composition chimique qui pourrait autrement perturber la stabilité du circuit en fonction du temps. Des mesures de très grandes précisions sont donc possibles. Une application concerne les capteurs de pression soumis à de fortes variations de température et à des mesures très longues.
摘要:
An apparatus for determining the nature of the formation at the bottom of a wellbore being drilled with a tubular drill string through which drilling fluid is pumped to return the drilling fluid to the surface via the wellbore, the apparatus comprising a tool body for installation in a drill string with a bore extending there through and an ultraviolet fluorescence detector in a passageway in the tool body, the tool body being configured to receive drilling fluid from inside the drill string and to receive drilling fluid from outside the drill string, wherein the drilling fluid can be directed past the detector so as to enable measurements to be made.
摘要:
Apparatus for optically determining the presence of carbon dioxide within a fluid, said apparatus comprising: - a light emitting source, - an optical sensing probe in contact with the fluid to analyze; - optical light transmitting means in order to convey the light emitted from the light emitting source to the optical sensing probe and the light reflected by the optical sensing probe to means to discriminate between wavelengths of light beams reflected by the optical sensing probe; - means to convert wavelengths discriminated light beams into measurement data indicating presence of carbon dioxide within the fluid, wherein the optical sensing probe comprises a tip working as attenuated total reflection (ATR) absorber within the infrared wavelength.
摘要:
Apparatus for investigating underground formations surrounding a borehole, comprises: a drill bit (40); an optical probe (46) having substantially the same outer diameter as the drill bit; a drive mechanism, operable to cause the drill bit to drill a hole in the formation when the apparatus is in the borehole, and to advance the optical probe into the drilled hole; and an optical system, arranged such that when the optical probe is in the drilled hole, light from a light source is directed into the optical probe, light entering the probe from the source is directed at the formation (50) around the drilled hole, and light entering the probe from the formation around the drilled hole is directed to a detector. A method of investigating underground formations surrounding a borehole, comprises: drilling a hole in the formation to be investigated using a drill bit; inserting an optical probe having substantially the same outer diameter as the drill bit into the hole; directing light from a light source to the probe; directing light entering the optical probe to the formation around the drilled hole; directing light entering the optical probe from the formation to a detector; and analysing the light received at the detector.