1. Product Introduction
Chromium lignosulfonate is refined by a series of reactions such as oxidation and complexation with the waste liquid of sulfite wood pulp or calcium lignosulfonate and sodium lignosulfonate as the main raw materials.
The appearance of the product is brown powder, easily soluble in water, and the aqueous solution is weakly acidic. Its molecular weight is more suitable for the viscosity reduction process of drilling mud than that of iron chromium lignin sulfonate.
At the same time, the iron content of the product is less than 0.8% to avoid the pollution of iron ions to oil wells. Therefore, chrome lignin is a mud viscosity reducer with similar or (slightly better) performance to iron chromium salt and less pollution to oil wells.
Chromium lignosulfonate not only has the function of reducing water loss, but also has the function of dilution. At the same time, it also has the characteristics of salt resistance, high temperature resistance and good compatibility. It is a diluent with strong salt resistance, calcium resistance and temperature resistance. The products are widely used in fresh water, seawater, saturated brine mud, various calcium treated mud and ultra deep well mud, which can effectively stabilize the well wall and reduce the viscosity and cutting of the mud.
2.Mud properties
(1) The performance remains unchanged at 150 ~ 160 ℃ for 16 hours.
(2) The performance of 2% brine slurry is better than that of iron chromium lignosulfonate.
(3) It has strong electrolyte resistance and is suitable for all kinds of mud.
