In the drilling mud recycling system, customers often order some decanter centrifuge from us to recycle barite in the drilling fluids. So what is the barite? What is it used for in oil well drilling.
Barite is barium sulfate (BaSO 4) as the main composition of non-metallic minerals, pure barite show white, luster, due to the influence of impurities and foreign matter also often appears grey, light red, light yellow, etc., crystallization is quite a good barite can also be a transparent crystal.The hardness of barite is 3 ~ 3.5 (mohs), specific gravity is 4.3 ~ 4.7, than the big, low hardness, brittle characteristics.Barite chemically stable, insoluble in water and hydrochloric acid, nonmagnetic and toxicityBarite is a kind of very important non-metal mineral raw materials, has a wide range of industrial applications
1, drilling mud weighting agent
In some oil and gas well drilling, the general use of drilling mud, clay proportion of 25 or so, the proportion of water is 1, so the mud weight is low, sometimes the mud weight can't with underground oil and gas pressure balance, has caused the blowout accident.Under the condition of the underground pressure is higher, you need to increase the mud weight, added to the mud barite powder is an effective measure to increase the mud weight. For drilling mud barite general fineness to achieve more than 325 mesh, such as inadequate barite fineness is prone to precipitation. Drilling mud with barite for weighting is greater than 4.2, BaSO4 content not less than 95%, less than 1% soluble salts.
2, lithopone pigment
Lithopone is a commonly used high quality white pigments, can be used as paint, paint raw materials. Heat the barium sulfate, using the original agent can be reverted to barium sulfide (BaS), and then react with zinc sulfate (ZnSO4) to get a mixture of zinc sulfide and barium sulfate (BaSO4 accounted for 70%, ZnS 30%) administered as lithopone paint. Barite requirements of producing lithopone BaSO4 content is greater than 95%, at the same time should contain no visible color clutter.
Normally decanter centrifuge is used for separate barite. This will be a very cost effective solutions for clients.