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    • 7. 发明公开
    • NEUTRON-GAMMA DENSITY THROUGH NORMALIZED INELASTIC RATIO
    • 中华人民共和国爱尔兰正义主义者解放阵线VERHÄLTNIS
    • EP2649474A2
    • 2013-10-16
    • EP11839181.2
    • 2011-11-09
    • Services Pétroliers SchlumbergerSchlumberger Holdings LimitedSchlumberger Technology B.V.PRAD Research and Development Limited
    • TKABLADZE, AvtoEVANS, MichaelSTEPHENSON, Kenneth
    • G01V5/14G21G4/02G01T3/00
    • G01V5/108G01V5/104G01V5/105G01V5/107
    • Systems, methods, and devices for determining neutron-gamma density (NGD) measurement of a subterranean formation that is accurate in both liquid- and gas-filled formations are provided. For example, a downhole tool for obtaining such an NGD measurement may include a neutron generator, neutron detector, two gamma-ray detectors, and data processing circuitry. Neutron generator may emit neutrons into a formation, causing a fast neutron cloud to form. Neutron detector may detect a count of neutrons representing the extent of the neutron cloud. Gamma-ray detectors may detect counts of inelastic gamma-rays caused by neutrons that inelastically scatter off the formation. Since the extent of the fast neutron cloud may vary depending on whether the formation is liquid- or gas-filled, data processing circuitry may determine the density of the formation based at least in part on the counts of inelastic gamma-rays normalized to the count of neutrons.
    • 提供了用于确定在液体和气体填充的地层中准确的地下地层的中子 - 伽马密度(NGD)测量的系统,方法和装置。 例如,用于获得这样的NGD测量的井下工具可以包括中子发生器,中子检测器,两个伽马射线检测器和数据处理电路。 中子发生器可以将中子发射到地层中,形成快中子云。 中子检测器可以检测代表中子云范围的中子数。 伽马射线检测器可以检测由非弹性地离开地层的中子引起的非弹性γ射线的计数。 由于快中子云的程度可以根据地层是液体填充还是填充气体而变化,所以数据处理电路可以至少部分地基于归一化为非均匀性的非弹性γ射线的计数来确定地层的密度 计数中子。
    • 10. 发明申请
    • METHOD OF DETERMINING DENSITY OF UNDERGROUND FORMATIONS USING NEUTRON-GAMMA RAY MEASUREMENTS
    • 使用中子 - 伽马射线测量法确定地下岩石密度的方法
    • WO2010118875A1
    • 2010-10-21
    • PCT/EP2010/002334
    • 2010-04-14
    • SERVICES PETROLIERS SCHLUMBERGERSCHLUMBERGER TECHNOLOGY B.V.SCHLUMBERGER HOLDINGS LIMITEDSCHLUMBERGER CANADA LIMITEDPRAD RESEARCH AND DEVELOPMENT LIMITEDEVANS, Michael
    • EVANS, Michael
    • G01V5/10
    • G01V5/101
    • A method of determining the density of an underground formation surrounding a borehole from measurement of gamma rays arising from irradiation of the formation by a nuclear source in a tool body located in the borehole, and measurement of gamma-ray flux in the tool body at two different detector spacings from the source, the method comprising determining a substantially straight-line relationship between gamma-ray flux measurements at each different spacing with respect to the density of the formation for a tool body with no standoff; determining a relationship defining the deviation with respect to tool standoff of the density determined from the measured gamma-ray flux measurements at the two different detector spacings from the density calculated from the straight line relationships; and for a given pair of gamma-ray flux measurements at the different detector spacings, determining the intersection of the relationship defining the deviation with the straight line relationship so as to indicate the density of the formation surrounding the borehole; wherein the source is a neutron source and the gamma rays measured in the too! body are neutron-induced gamma rays resulting from neutron irradiation of the formation.
    • 一种通过从位于钻孔中的工具体中的核源照射产生的伽马射线的测量来确定钻孔周围地下地层的密度的方法,以及在两个工具体中测量γ射线通量 与源不同的检测器间隔,该方法包括确定在每个不同间隔处的伽马射线通量测量值相对于没有间隙的工具主体的密度的基本上的直线关系; 确定相对于从两个不同检测器间隔处测量的伽马射线通量测量值与从直线关系计算的密度确定的密度的刀具间隔的界定的关系; 并且对于在不同的检测器间隔处的给定的一对伽马射线通量测量,确定限定偏差的关系与直线关系的交点,以指示围绕钻孔的地层的密度; 其中源是中子源,伽马射线也在测量中! 身体是由地层的中子照射产生的中子诱导的γ射线。