Composition, method of preparation and use of ultralight fluid oil-based drill in areas of depression with shale assets

摘要

Composition, method of preparation and use of ultralight fluid oil-based drill in areas of depression with shale active the present invention relates to an improved composition, preparation and application of a drilling fluid based foamed Ultralight Oil, with half lives exceeding 10 hours, for drilling in oil fields with depression.Where there are bodies of clay loam which are active and brittle and which also have a temperature exceeding 180 degrees. The fluid utraleve is resistant to contamination with seawater, crude oil, acid gases, cement and drilling cuttings.This fluid can be used for drilling, recondicionamnento and completion of wells, using the methods of drilling in subequilibrio or drilling pressure control or the traditional drilling method using a gas (nitrogen, air, among others).He employs a foam generator and / or a diffuser, individually or in combination, to reduce the specific weight of the fluid below 0.2, and may be pumped into the well.A new aspect of the present invention is that the stability of the fluid is improved when subjected to the efeiros temperature and that it can be pumped into the pit, without the problems of cavitation, through the use of a pump connected to the suction discs exgtremidade pumps Of the sludge.