| abstract |
The invention relates to ancement paste delay,nusable, in particular, but not exclusively, forncementing of deep-sea wells,nrespectively of medium or medium temperature probesnhigh, ranging from 500 to 2000 ° C. Conformablenof the invention, a 500 l delayed amountncontains 370 l of concentrated lignosulphonate,nwith a density of 1.18 gf / dm3, 51 kg of hydroxidenof sodium, respectively 65-85% of onenthe amount of 65 kg of tartrate residuen(8 ... 15% of lignosulfonic boron) and 4%n(20 kg) of formaldehyde for preservation.nClaims: 1 |