An analysis of abnormal LWD curve shapes in highly-deviated wells and horizontal wells and its application in stratigraphic division

THE RESEARCH AND APPLICATION OF HZMWD;

Firstly the role of the rotary pressure signal generator is introduced in the system of wireless MWD,and based on the principle of the rotary pressure signal generator,a system structure models are designed,according to the different stages of the process,various process valves mouth dynamic equation is established.

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;