Combating lost circulation during the drilling of wells
US5501277A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1995 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Mar 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides improved methods of combating lost drilling fluid circulation in wells, particularly in wells penetrating vugular and naturally fractured formations such as geothermal wells. The methods basically comprise the steps of forming a quick set cementitious composition which when drilled after setting produces cuttings compatible with the drilling fluid being used, introducing the cementitious composition into the drilling fluid thief zone in the well, allowing the composition to set into a cementitious plug in the thief zone and then continuing the drilling of the well bore through and below the cementitious plug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.