The invention relates to oil field drilling, including weighting factors from small particles.Particle content lambda feti03 has a specific surface area of at least 85% by weight. The surface (BET) is 1 and 5 square meters/g, of which 90% of the volume and particle have The gamma ray is less than 12.The laser diffraction particle size analyzer with D50 3pm and volume measurement between 5pm and D50 was used for diffraction.These particles have an average of at least 0.85 definite periodicity analysis images.The invention further relates to oilfield high density cement slurry weighted by water, cement, materials and pi______kappa_. The powder, PKP, P, R, R, F and P1 of P1Clastic particles, liquid loss and addition of a flame retardant material in which the weight of lambda__ "Feti03 at least 85 wt.%.Surface specific surfaces (BETs) are 1 and 5 square meters per gram, and 90 volumes, one of which has a particle size less than 12.Laser Diffraction Particle Size Analyser between 5pm and a d50:3 and Laser Diffraction Measurement in Morwin, where Mr. Average Particle Size It is at least 0.85 identified image analysis. Finally, the invention relates to a pulp pulp lambda.
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