发明名称 |
COMPENSATED SIGMA FROM MEASUREMENTS MADE BY A PULSED NEUTRON INSTRUMENT |
摘要 |
A method for determining a formation thermal neutron decay rate from measurements of radiation resulting from at least one burst of high energy neutrons into formations surrounding a wellbore includes determining a first apparent neutron decay rate in a time window beginning at a first selected time after an end of the at least one burst, a second apparent decay rate from a time window beginning at a second selected time after the burst and a third apparent decay rate from a third selected time after the burst. The second time is later than the first time. A thermal neutron capture cross section of fluid in the wellbore is determined. A decay rate correction factor is determined based on the first and second apparent decay rates and a parameter indicative of the wellbore capture cross-section. The correction factor is applied to the third apparent decay rate to determine the formation thermal neutron decay rate. |
申请公布号 |
WO2014039599(A1) |
申请公布日期 |
2014.03.13 |
申请号 |
WO2013US58131 |
申请日期 |
2013.09.05 |
申请人 |
SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER TECHNOLOGY B.V.;PRAD RESEARCH AND DEVELOPMENT LIMITED;SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
ZHOU, TONG;STOLLER, CHRISTIAN |
分类号 |
G01V5/10 |
主分类号 |
G01V5/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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