Patent ID: 7169738
Filing Date: 2007-01-30
Classification: C04B,C09K,Y10S

Abstract:
1. A method of increasing the density of a fluid phase of a drilling fluid, the method comprising adding to the fluid phase of the drilling fluid a solid phase weight material for increasing the density of the drilling fluid, wherein the solid phase weight material is a particulate material and has a particle size distribution such that: particles having a diameter less than 1 μm are 0 to 15% by volume; particles having a diameter between 1 μm and 4 μm are 15 to 40% by volume; particles having a diameter between 4 μm and 8 μm are 15 to 30% by volume; particles having a diameter between 8 μm and 12 μm are 5 to 15% by volume; particles having a diameter between 12 μm and 16 μm are 3 to 7% by volume; particles having a diameter between 16 μm and 20 μm are 0 to 10% by volume; particles having a diameter greater than 20 μm are 0 to 5% by volume.