A method to prevent flow of fluid through a conical face of a drill milling machine in a switch hole well and method for maintaining a pressure above a switch of drill milling machine in a well bore

摘要

Summary "method to prevent flow of fluid through a conical face of a drill milling machine in a switch hole well and method for maintaining a pressure above a switch of drill milling machine in a well bore" a method to prevent flow of fluid through a conical face of a deviator of Drill milling machine in a hole of the well cover: position the deviator of drill milling machine in the hole of the well.In the switch of drill milling machine comprises: a body; a conical face, in which the face cone is located at one end of the body; and a material intumescente,When the material is positioned so intumescente: circumferential around the body of the deviator of drill milling machine adjacent to the tapered face; swells in the presence of a fluid intumescente; and substantially prevents the whole of a fluid to flow through the material intumescente after Ma Terial intumescente have puffed; and to make or allow the material intumescente intumesu00e7a.The material intumescente can also prevent a loss of pressure in the well bore above the material intumescente or prevent a first fluid having a first density mix with a second fluid having a second density after the material intumescente have puffed.