Method and device for drilling into tubulars located within one another
OwnerTor Johannesseninventor
Life of this patent
Estimating the term…
Abstract
Method and device to increase the feed speed of a drill bit (2) and its associated drilling device (1) when drilling through tubulars (6, 8, 10) located within one another where in the annuli (12, 14) created between the tubulars (6, 8, 10) there is located a material or a fluid which in comparison to the pipe wall material is easer to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which preferably is located close to the drilling device (1), and where there during the progress of the drill bit (2) through the annulus (12, 14) is opened for an influx of pressure fluid in parallel with the pressure fluid regulating valve (52).
Claims4
A method for a drilling device (1) to increase the feed speed of a drill bit (2) when drilling through tubulars (6, 8, 10) located within one another, where there in the annuli (12, 14) created between the tubulars (6, 8, 10) is located a fluid or a material which in comparison to the pipe wall material, is easier to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which preferably is located near to the drilling device (1), characterised in that during the progress of the drill bit (2) through the annulus (12, 14) there is opened for an influx of pressure fluid in parallel with the pressure fluid regulating valve (52).
A device for a drilling device to increase the feed speed of a drill bit (2) when drilling through tubulars (6, 8, 10) located within one another and under water, where there in the annulus (12, 14) created between the tubulars (6, 8, 10) is located a fluid or a material, which in comparison to the pipe wall material, is easier to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which is connected to a hydraulic feed line (48) and where the hydraulic feed line (48) passes from a feed valve (40) to a feed cylinder (26), as the pressure fluid regulating valve (52) preferably is located close to the drilling device (1), characterised in that there in parallel with and connected to the hydraulic feed line (48) above and underneath the pressure fluid regulating valve (52) passes a hydraulic quick feed line (60) which is provided with a block valve (58).
Dependencies are inferred from the claim text.