METHOD OF MAKING POLYDISPERSE PEAT REAGENT FOR BORING SOLUTIONS AND KILL FLUIDS Russian patent published in 2008 - IPC C09K8/20 C09K8/42 

FIELD: chemistry.

SUBSTANCE: invention pertains to the oil and gas industry, in particular, to chemical processing of boring solutions used for opening permeable beds under absorption conditions, and kill fluids used for repairing cracks under conditions of abnormal low pressure. The technical outcome is the improved quality of the reagent, which has higher hydrogen index, water absorption, high gel-forming capacity, improved technological parameters of the boring solutions and kill fluids containing the reagent. In the method of making polydisperse peat reagent for boring solutions and kill fluids, the peat is sieved to a fraction of 01.-10.0 mm, dried to constant residue moisture of 18-25%. The peat is heated at a rate of 2°C per minute to 75-85°C, thermostated at that temperature for 1 hour and cooled to 50°C. Then the peat is reated with calcinated soda in mass ratio of 1:0.15-0.20, respectively, and later, with acry amide polymer, with molar fraction of carboxylate groups of 10-30 in mass ratio of peat-alkaline mixture - the indicated polymer of 1:0.03-0.04, respectively. The invention is developed in subclaims.

EFFECT: improved quality of the reagent.

3 cl, 3 ex