SURFACE TREATED LOST CIRCULATION MATERIAL

摘要

A granular lost circulation material for use in a wellbore during drilling operations to minimize loss of drilling fluid at a lost circulation area is disclosed. The granular lost circulation material comprises a granular material and a non-hardening tackifying agent. The granular material is coated with the non-hardening tackifying agent. The granular lost circulation material forms agglomerated particles, which form a filter cake at the lost circulation area.

主权项

1. A process for drilling a wellbore with a drill bit on the end of a drill string with minimal loss of drilling fluid, wherein the process comprises:
(a) providing a drilling fluid with a granular lost circulation material comprising a granular material, which has been coated with a non-hardening tackifying agent; (b) introducing said drilling fluid during drilling such that said granular lost circulation material forms plugs at lost circulation areas at the periphery of said wellbore and forms a filter cake at such lost circulation areas and blocks or reduces fluid flow from said wellbore into said lost circulation areas.