FIELD: chemistry.
SUBSTANCE: polymeric composition for highly mineralised water-based weighted drilling fluids includes hydrolysed cyanoethylated polyvinyl alcohol, which is synthesised by an interaction of acrylonitrile with polyvinyl alcohol in a water-alkaline medium, and oxyethylcellulose with the following ratio of ingredients, wt %: hydrolysed cyanoethylated polyvinyl alcohol 80-90, oxyethylcellulose 10-20.
EFFECT: considerable reduction of the index of high-temperature filtration, optimal structural-mechanical and viscous characteristics of fluids for accident-free drilling of gently sloping and horizontal wells, composed by highly colloidal clayey rocks at high temperatures.
3 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| WATER-BASED HIGH-MINERALIZED WEIGHTED MUD | 2013 |
|
RU2530097C1 |
| WEIGHTED MINERALIZED CLAYLESS DRILLING MUD | 2017 |
|
RU2655276C1 |
| STRENGTHENED MINERALIZED BORING SOLUTION FOR THE OPENING OF PRODUCTIVE PLATES WITH ABNORMALLY HIGH PLASTIC PRESSURE | 2018 |
|
RU2683448C1 |
| DRILLING MUD WATER LOSS REDUCING AGENT | 0 |
|
SU732357A1 |
| CLAY-LESS POLYSACCHARIDE DRILLING AGENT | 2009 |
|
RU2427605C1 |
| EMULSION SOLUTION ON HYDROCARBON BASE | 2010 |
|
RU2424269C1 |
| SOLID PHASE-FREE WELL KILLING FLUID | 2006 |
|
RU2314331C1 |
| WEIGHTED INVERT-EMULSION DRILLING MUD | 2017 |
|
RU2655035C1 |
| ADDITIVE FOR DRILLING MUD COMPOSITIONS | 1999 |
|
RU2177492C2 |
| POLYMERIC HYDROGEL DRILLING MUD | 2000 |
|
RU2179567C2 |
