Drilling fluids
AssigneeLamberti SPA
InventorsLuigi MERLI, Laura VIGANÒ, Lycia BERTANI
Life of this patent
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Abstract
Methods of reducing the soil disintegration while drilling a wellbore for oil or gas production through unstable clayey soils. The method comprises drilling the well in the presence of a water-based drilling fluid that includes natural wax microparticles that improve the stability of the wellbore by significantly reducing the interactions of the drilling fluid with such soils.
Claims17
A method of reducing the soil disintegration when drilling a wellbore for the production of oil or gas in unstable clayey soils comprising the following steps:
- (a) providing a water-based drilling fluid comprising 0.5 to 6.0 g/100 ml of microparticles, having a median particle size comprised between 0.020 and 10 □m, of a natural wax with a melting point comprised between 3° and 95° C.;
- (b) drilling the borehole in the presence of the water-based drilling fluid that contains said wax microparticles, thereby reducing the soil disintegration.
Use of microparticles having a median particle size comprised between 0.020 and 10 □m of a natural wax with a melting point comprised between 3° and 95° C., in a water-based drilling fluid, for reducing the soil disintegration when drilling a wellbore for the production of oil or gas in unstable clayey soils in the presence of the water-based drilling fluid, wherein the water-based drilling fluid comprises from 0.5 to 6.0 g/100 ml of the microparticles.
A water-based drilling fluid comprising 0.5 to 6.0 g/100 ml of microparticles having a median particle size comprised between 0.020 and 10 □m of a natural wax with a melting point comprised between 3° and 95° C.
Dependencies are inferred from the claim text.