POLYFUNCTIONAL COMPLEX REAGENT FOR WARNING OCCURRENCE OF DIFFERENTIAL STICKING Russian patent published in 2010 - IPC C09K8/35 

FIELD: chemistry.

SUBSTANCE: invention relates to well drilling, particularly reagents for warning occurrence of differential sticking. The polyfunctional complex reagent for warning occurrence of differential sticking, which contains a mud additive, contains the mud additive in form of derivatives of higher fatty acids obtained from processing wood or petroleum resins and tar, SAF, Soltex or Baratrol, as well as a product of condensation of fatty acids of tall oil or fatty acids of plant oil, including spent oil with at least one of the following: mono-, di-, triethanolamine at temperature 130-160°C for not less than 1 hour in weight ratio of said components equal to 1:0.2-0.6, respectively, modified with neonol with oxyethylation degree equal to 9-12 for not less than 2 hours at temperature 60-80°C in weight ratio of 1:0.05-0.2, respectively, and a mixture of dioxane alcohols - Burflub-BT, DSPB, T-80, with the following ratio of components, wt %: said modified condensation product 36.0-71.5; said fatty acid derivatives 10.0-28.5; said mixture of dioxane alcohols - the rest. The reagent can also contain a mud additive in form of carboxymethyl cellulose or Reopak polyanionic cellulose in amount of 10.0-50.0 wt %.

EFFECT: improved tribotechnical, anti-sticking and filtration properties of drill fluids in conditions of polymineral aggression with retention of reservoir porosity and permeability properties of the producing layer.

2 cl, 1 ex, 3 tbl