1.1.3 environmentally friendly fluid loss additive

With the increasing attention to environmental protection, foreign researchers have increased the research and development of environmentally friendly fluid loss additive in recent years. The so-called environmentally friendly fluid loss additive refers to the product with good biodegradability. At present, the main ways to develop environmentally friendly fluid loss additive are:  

1) to develop natural products with filtration function;  

2) to modify the existing natural product fluid loss additive and broaden its application scope;  

3) to develop fluid loss additive which is stable in strong alkaline environment and degraded in neutral water medium 

4) Low molecular weight polymer was crosslinked with degradable crosslinking agent to obtain high molecular weight fluid loss additive 

5) The degradable synthetic polymer was modified to reduce filtration 

6) A synthetic polymer fluid loss additive with similar structure to natural products and degradable by microorganisms was developed.