Method for identifying a change in volume of the well bore during drilling, and method for identifying an event of washing shaft during drilling of a hole of underground well

摘要

Method for identifying a change in volume of the well bore during drilling, and method for identifying an event of washing shaft during drilling of a hole of underground well.A method for identifying a change in volume of the well bore during drilling of a hole of underground well includes the acquisition of first and second pressure measurements spaced axially in the bore of the shaft. The change of volume of the well bore may include, for example, a Washing pit or obstruction of the well.The pressure measurements may then be processed to obtain a density range of drilling fluid between the sites of measurement.A column of tool, including a large number of pressure sensors spaced axially (for example, four or even six or more) electronically coupled to a processor of the surface by means of drill pipe with wire, can be used to obtain a plurality of The density of interval corresponding to various ranges of hole of shaft.The densities of the range can be measured during drilling and can be measured as an indication of a change in volume of the hole of the well.