A low power design method with underground sensors used in LWD system is presented.

The comparison between logging while drilling(LWD) and wireline logging(WL) curves of a oilfield shows that: the depth,value of resistivity,and distribution range of density of the LWD measurements are rather close to that of WL,invasion effect in LWD is less than that in WL,so LWD can provide more credible information for oil-gas interpretation and formation evaluation.

Intense electromagnetic interference while drilling prevents traditional analog phase sensitive demodulation(APSD) from correctly acquiring electromagnetic wave signal of logging while drilling(LWD).

Introduced are specialities,structures and parameters of some newly developed Logging While Drilling(LWD)tools used by eminent well logging companies in the past few years,such as quadrupole shear wave technology,multipole sonic tools,compact propagation resistivity tool,azimuthal focused resistivity sensor,azimuthal deep resistivity tool,etc.

Using LWD Logs to Guide Horizontal Well Drilling;

Application of LWD PeriScope to Horizontal Well Development in Karamay Oil Field;

Design of a general memory module of large capacity for down-hole LWD tools;

The development of logging-while-drilling and its application;

The modeling of logging-while-drilling tool's three-dimensional electromagnetic response using the high order hierarchical vector finite element method

Stratum data acquired from LWD(logging-while-drilling),because of the two characteristics of immediacy and authenticity,have favorabe dominance in log evaluation of horizontal well,and can be used to effectively distinguish stratum,oil and gas r.

The Comparison of characteristic of responses between Cable Logging and Logging While Drilling in Horizontal Well;

Acoustic spectral characteristics of drill string of logging while drilling;

Studying on Inversion Method and Application of Logging While Drilling Response;