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    • 9. 发明公开
    • Depth positioning using gamma-ray correlation and downhole parameter differential
    • Tiefenpositionsbestimmung mittels Gammastrahlenkorrelation und differentnziellen Bohrlochparametern
    • EP2966258A1
    • 2016-01-13
    • EP14290206.3
    • 2014-07-10
    • Services Petroliers SchlumbergerSchlumberger Holdings LimitedSchlumberger Technology B.V.
    • Merino, CarlosRezgui, Fadhel
    • E21B47/04
    • E21B47/044E21B47/06E21B47/065E21B47/09E21B47/12E21B49/00
    • 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.
    • 一种用于确定井眼中的管状管柱或井下部件的位置的方法,包括将管状管柱(315)放置在具有至少一个放射源(400)的井筒(310)中,所述管状管柱具有深度测量模块(102 )并且获得多个井下参数测量值,其中至少一个井下参数是深度的函数。 该方法还包括获得多个辐射强度测量值并确定所使用的井眼中的管柱的长度变化L“,以获得多个井下参数测量值和多个辐射强度测量值。 该方法还包括基于多个井下参数测量值,多个辐射强度测量值和井筒中的管柱长度变化L“的相关性来确定井眼中的深度测量模块的位置。