Patent · US Active

Methods and compositions for cleaning interior of a casing string

US11186760B2 · kind B2 · utility

0Cited by

3References

14Claims

0Family size

Assignee

SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

Diankui Fu · Missouri City, US
Bipin Jain · Sugar Land, US
Soo Hui Goh · Kuala Lumpur, MY

Key dates

Filing date	Nov 26, 2015
Grant date	Nov 30, 2021
Priority date	—
Expiry date	Nov 26, 2035

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B37/10
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Aqueous fluids containing hydrophobic particles are effective media for cleaning water-base drilling fluids and drilling fluid solids from the interior surface of a casing string. Hydrophobic fibers may be added to a drilling fluid, a spacer fluid, a sacrificial spacer fluid, a chemical wash, or combinations thereof. The disclosed fluids may be employed during primary cementing operations where it is not possible to use a bottom plug.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.