Patent ID: 11940590
Assignee: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
Field: Measurement (Instruments)
Classification: CPC G  E  Y | IPC E  G

Claim 7:
8. The fast forward method for gamma-ray logging of highly-deviated and horizontal wells according to claim 7, wherein step S2 comprises the following steps:
step S21: constructing an equivalent detection sphere whose radius is the effective detection radius r0 of the gamma detector by taking a current detection point as the center of the sphere, and determining an effective gamma-ray flux contribution area of the current detection point; and
step S22: when the wellbore is perpendicular to the formation, directly adopting an equivalent integral under the condition of the straight well; and when an included angle between the wellbore and the formation is less than 90°, in an effective gamma-ray flux contribution space, converting the integral of the gamma-ray flux received by the detector under the condition of the deviated well into the equivalent integral under the condition of the straight well;
where the equivalent integral under the condition of the straight well is obtained by using the one-dimensional equivalent longitudinal contribution coefficient to perform weighted accumulation on the gamma-ray fluxes of the formations at different distances from the center of the gamma detector within the effective detection range.