Study Of Long Horizontal-section Well Drilling Technology In Sulige Gas Field

Sulige gas field regional structure locates in the northwest of northern Shaanxi slope in the Ordos Basin, with complex geological conditions. In this region gas exploration and development is difficult and costly, gas layer with features of low permeability, low pressure, low well productivity, fast pressure drop and short stable time.To further enhance the level of horizontal drilling technology, achieve long horizontal-section well drilling speed and efficiency in Sulige gas field, reduce drilling costs and avoid the occurrence of drilling accidents and complex, focused on difficult issues of long horizontal-section well drilling, following techniques were studied systematically in this paper, according to the theoretical analysis of the data from experimental site: Firstly, by analysis and summary of the use previous horizontal wells drill, more single drill footage and higher drilling speed drill were preferred, with personalized improvements to enhance the drill efficiency; Secondly, by using the new KCL drilling fluid system and blocking measures strengthened, well-bore stability problems were solved; Thirdly, by controlling the rheological parameters, using the flow-type regulator and cake quality improving agent, hole cleaning problems were solved; Fourthly, through the application of featured technology "lubricating and anti-Sticking", further strengthening the cake quality, optimizing RHZY/TZLQ and other measures, anti-Sticking and anti-tropsch lubricating pressure problems were solved; Finally, by controlling the well borehole trajectory to maintain wellbore sleek, dogleg small to ensure the torr pressure/ pulling force and rotational torque on a low level and tripping smoothly during the construction in long horizontal section. Eventually, the initial formation of a supporting technology of long-horizontal well drilling has some guidance for Sulige gas field in the future.