Analysis on the Influence Factors of Well Deviation in Gas Drilling

Abstract

Well deviation control has become a bottleneck restraining the development of gas drilling. Without lubrication of drilling fluid and the existence of negative pressure differential, the reasons of well deviation in gas drilling are different from in mud drilling. The effects of stress distribution difference, rock-breaking mechanism, well bore enlargement and water export on well deviation during both gas drilling and mud drilling are compared and studied on the basis of the previous studies in this paper. The conclusion demonstrates that the new stress state of the bottom rock, the uneven crater which is formed by rock breaking and the borehole enlargement are the main causes of well deviation during gas drilling.

Dependency of Pressure Expression towards Formation Pressures during Drilling Operations in Hydrocarbon Wells and Suitable Choice of Pressure Control Method

“…Myron M. Kinley invented a large number of methods, various preparations and devices, most of which are still used today, and Harry S. Cameron invented the pipe ram preventers [2][3][4][5][6][7]. Not all hydrocarbon deposits that are discovered are cost-effective [8,9].…”

Warning Signs of High-Pressure Formations of Abnormal Contour Pressures When Drilling for Oil and Natural Gas

“…In order to achieve technical success, safe management and well control, a systematic understanding of the parameters during drilling and equipping of the well is necessary [7]. Horizontal or direct natural gas and oil wells are difficult to evaluate owing to the challenges associated with collecting data on formation pressure using a wire line [8,9].…”