HOUSTON — A buckled section of drill pipe caused the malfunction of supposedly fail-safe equipment when a BP well in the Gulf of Mexico blew out last April, killing 11 workers and spewing millions of barrels of oil into the Gulf of Mexico, according to a report released by the Interior Department on Wednesday.
A long section of drill pipe that engineers thought would be hanging from the original blowout preventer is instead down inside the well, Admiral Allen said, and technicians will try to remove at least some of it, a procedure known as fishing.
Drilling problems resulted in a section of drill string being stuck and the well being completed at a depth of 2124 m.
Once the top flange is removed, BP has to bind together two sections of drill pipe that are in the gushing well head.
As it was expected, the cutting gradually precipitates due to density difference with the mud, and the drilling fluid free from cuttings passes over the drill string, while the cuttings concentration increases at the lower section of the drill string.
Optimal position of excitation cross section of the drill bit, which depends on the relationship between elasto-dissipative characteristics of the transducer, the drill bit and the work load, is found in general analytical form.
First, one of the most important functions of the drilling fluid is to carry the cuttings outside the annulus, but the fluid in the upper section of the drill string, which is free from the cuttings, is unable to do so.
In this paper the dynamic behaviour of a section of whirling drill collars is analyzed in terms of rotor dynamics, with account taken of the non-linear influences caused by drilling fluid, stabilizer clearance and stabilizer friction.
A front section of the drill hall is enclosed with scrims for a kind of sound-and-light warm-up act called "Italy of the Cities," conceived for the Italian pavilion at the 2010 World Expo in Shanghai.
Gas is then heated up by the geothermal gradient in the lower section of the drill string.
