Effect of annular cuttings on negative pressure in under-balanced drilling process;

In air and mist drilling, annular carries are the typical of gas, liquid and solid multiphase flow, and its mechanism and principles are very complicated.

New cutting image analyzing technology;

Influence of Washing Ways of Oil Cuttings on Fluorescence Characteristics of Crude Oil;

Analyzing cutting oil bearing property with the fluorescence digital image technology;

Identification of debris based on texture feature

Benzene, toluene, ethylbenzene, xylene (BTEX) compounds in debris samples which were at different depth and at the same well were determined by micellar electrokinetic capillary chromatography (MECC).

Rock-drillability evaluation and bit selection through ultrasonic velocity measurement on cuttings;

Experiment and application of NMR technology on cuttings;

The method of oil bearing abundance in cuttings measured by mud logging technology of nuclear magnetic resonance

Starting from the view point of practical application, based on large amount of pressure well logging data home and abroad, the author demonstrated how to distinguish over-pressure formations using wellsite data, through selected methods such as drilling parameters, rock fragment analysis, drilling fluid parameters, and electric well-logging.

Results The Chang 4+5 reservoir rock of Jiyuan Oilfield is mainly lithic arkose with average rock fragment content of 17.