May 31

Introduction to barite

Barite, scientific name barium sulfate (BaSO4). China’s barite is rich in resources. It is distributed in 26 provinces, municipalities, and autonomous regions nationwide. It is mainly concentrated in the south. Guizhou Province accounts for one-third of China’s total reserves. Hunan and Guangxi rank the second and third in the country, respectively. The stone not only has a large reserve but also has a high grade of BaSO4>92.8%. The bonanza reserves accounted for 99.4% of the country’s total high-grade ore reserves, and large- and medium-sized ore reserves accounted for 88.4% of the country’s total. By the end of 1995, China had proven reserves of 460 million tons of barite resources.


In addition, barite is hardly soluble in water and acid, non-toxic, non-magnetic, and can absorb X-rays and gamma rays.

The main use of barite in the drilling industry:

1,The weighting agent used for solid control system mud to balance formation pressure and prevent blowout;

2, in the oil-based drilling fluid, adsorbed on the wall of the well, play a role in lubrication and anti-card;

3, plug the formation gap, shielding temporary gambling.

PLC Touch screen VFD centrifuge

Barite quality standards

Barite products have different specifications and quality requirements depending on their use.

Quality requirements for barite powder for oil drilling:

Density ≥ 4.2g/cm3

Barite powder size distribution

+200 mesh “3%

-200 mesh, 97%

– 2000 mesh “10%

Principles and Goals of Barite Recovery System

Size distribution of barite powder, bentonite and drill cuttings for drilling fluid weighting

Solid particle size distribution:

According to the standards set by the American Petroleum Institute (API), the solid phases in drilling fluids can be divided into three categories according to their size:

Sand (API sand) particle size greater than 74μm

Mud particle size between 2 and 73 μm

Clay particle size less than 2μm

Under normal circumstances, the particle size distribution of the solid phase in non-heavy drilling fluids is as follows:

Category Particle size range (μm) Corresponding mesh mass fraction (%)

Sand >2000 >10 0.8~2

250~2000 60~10 0.4~8.7

74~250 200~60 2.5~15.2

Mud 44~74 355~200 11~19.8

2~44 / 56~70

Clay <2 / 5.5~6.5

Solid-phase particle size distribution in drilling fluids (determined using typical disperse water-based drilling fluids)

The proportion of coarse sand particles with a diameter of more than 2000 μm and rubber particles with a diameter of less than 2 μm is not large in the drilling fluid. Among them, more than 74 μm (200 mesh screen cloth) accounted for 3.7-25.9% and less than 2 μm accounted for 5.5-6.5%.

More question,welcome contact GN Solids Control

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