Dry mix for producing a self-hardening drilling fluid, used for horizontal drilling, comprises a swellable clay mineral and foundry sand powder with a hydroxyl ion-forming activator

摘要

Dry mix for producing a self-hardening drilling fluid for horizontal drilling comprises (parts by weight): swellable clay mineral (10-70), foundry sand powder with a hydroxyl ion-forming activator (20-80), powdered limestone or other inert filler (0-30), retarder (0.1-2), plasticizer (0-2) and stabilizer (0-2). An independent claim is also included for a drilling fluid producing by mixing the dry mix with water and adjusting it to a consistency suitable for horizontal drilling.