METHOD OF BOTTOMHOLE SUPPORT IN WELLS Russian patent published in 2010 - IPC E21B33/13 C09K8/44 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, particularly to methods of bottomhole support in the well and return prevention. The method of bottomhole support in the well involves injection in the bottomhole zone of phenolformaldehyde resin and aqueous solution of hydrochloric acid to cure phenolformaldehyde resin. Preliminary in the bottomhole zone, isopropyl alcohol is injected, thereafter phenolformaldehyde resin mixed with isopropyl alcohol is injected in the ratio, vl %: phenolformaldehyde resin - 90-95% isopropyl alcohol - 5-10%; then aqueous solution of hydrochloric acid in concentration 12-24%, after injection of isopropyl alcohol and phenolformaldehyde resin mixed with isopropyl alcohol, curing follows for at least 8 hours; all said chemicals are injected in the volume sufficient to form a screen in the bottomhole zone with the coverage diametre at least 1.8 metres, and injection of aqueous solution of hydrochloric acid is carried out at the maximum consumption not causing the growth of injection pressure above admissible pressure on a flow string of the well and beds found in the bottomhole zone of the well.

EFFECT: higher efficiency of the bottomhole support.

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