VISCOUS-RESILIENT DIVIDER OF DRILL FLOWS Russian patent published in 1999 - IPC

FIELD: drilling technology. SUBSTANCE: dividing material is generally intended for strengthening of oil and gas wells and is particularly used for displacing and separation of drill flows by means of water- or oil-based solution, also for separating them from plugging solutions during cementation of wells, and also for cleaning bore-hole of well prior to geophysical investigations. Viscous-resilient divider contains following components, mas.%: polyacrylamide, 0.25-0.50; lignosulfonates, 5-10; sodium or potassium bichromate, 0.060-0.125; water, the balance. Proportion of lignosulfonates and sodium or potassium bichromate is within 40:1-166.7:1. Viscous-resilient divider can contain weighting or lightening filler in amount of 2-5% from mass of divider. Application of aforesaid dividing composition improves quality of cementation, ensures ecological safety of drilling operations, allows for quick performance of technological operations relating to separation of drill flows and preparation of well bore-holes together with overall reduction or material and labour costs. EFFECT: higher efficiency. 2 cl, 2 tbl