Development of innovative lightweight slurry in oil well-cementing operations

Abstract

The innovative lightweight slurry 85 lb/ft3 (pounds per cubic foot) was prepared using three blended materials with a combination of 20% micro silica, 44% cenosphere and class-g cement, a special hydraulic binding material to forms strong bonding energy due to a combination of moderate sulphate-resistant and high sulphate-resistant. Cementing laboratory tests were carried out in the mix with this blended cement and some additives to control fluid loss increase the bonding energy and delay the cement setting time. After added this blended cement, the mechanism of the slurry was optimized the particle size distribution to maximum solids content, less water wasted in the void, the solid volume fraction increased to 50.2%. The blended composition shows fine nature and high reactivity as a pozzolanic material to improve slurry stability. Also, concluded that the high solid content increased in the slurry to enhance comprehensive strength, mechanical durability, permeability and required thickening time for low-density 85 pcf lead slurry. Pilot test results presented good compressive strength and thickening time at low temperatures.