Research And Application Of Precise Managed Pressure Drilling Technology In Centraltarim Area

Centraltarim Area in Triassic and Permian sand mudstone alternating frequently, even falling prone to collapse the ordovician purpose layer window slit hole pressure development is good, easy leakage on spray provided, there is a big risk of construction.Based on the optimized drilling tower blocks of the analysis of the technical difficulties,according to the actual characteristics of the tower blocks, from save the cost of casing and the perspective of tripping time limit for a project, identified by fine control pressure drilling model for the solution, to ensure the smooth implementation of the drilling construction.After the deep well of super deep well optimized drilling technology at home and abroad were reviewed and research, and combined with the analysis of the tower regional geology and drilling data, the technical difficulties of tower blocks, and formulate the relevant countermeasures. Aimed at the characteristics of tower blocks, determine the drilling in the block, and a method for determining the safe density window can be accurately forecast according to the adjoining well related information for well safe density window, according to the calculation results, the fine control pressure drilling mode is determined.At the same time, through the fine control pressure drilling technique is studied,according to the relevant supporting facilities and process related to the different working conditions were established, and through the analysis of different working conditions,formulated the related solution. Combining with the actual use effect shows that the introduction of the fine control pressure drilling technology and application, effectively solves the problem of narrow tower purpose layer window, extend the exploration depth of the objective layer, realize the purpose of the exploration. Easy to spray easy to leak,effectively avoid the tower blocks and sometimes spray leakage coexist, and achieve the goal of effective control annulus liquid surface profile, ensure within the wellbore pressure balance in the drilling process.