Barrier pills

US10428258B2 · kind B2 · utility

Assignee

• Halliburton Energy Services, Inc. · US

Inventors

• Kay Ann Galindo · Conroe, US
• Sandeep D. Kulkarni · Alpharetta, US
• Matthew L. Miller · Houston, US
• Dale E. Jamison · Humble, US
• Jessica Paola Ramirez Angulo · Kingwood, US
• William Walter Shumway · Spring, US

Key dates

• Filing date: Feb 10, 2015
• Grant date: Oct 1, 2019
• Expiry date: Feb 10, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/08
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present disclosure relates to systems and methods for wellbore pressure control with separated fluid columns. One embodiment is a composition comprising: a base fluid, a hectorite clay, a secondary clay comprising at least one clay selected from the group consisting of an attapulgite clay, a sepiolite clay, a palygorskite clay, and any combination thereof, and a plurality of fibers. Another embodiment is a method comprising: introducing a first fluid into a wellbore; introducing a barrier pill into the wellbore, wherein the barrier pill comprises: a base fluid, a hectorite clay, and a plurality of fibers; and introducing a second fluid into the wellbore. Another embodiment is a method comprising: introducing a first fluid into a wellbore; introducing a barrier pill into the wellbore, wherein the barrier pill comprises: a base fluid, a hectorite clay, and a secondary clay comprising at least one clay selected from the group consisting of an attapulgite clay, a sepiolite clay, a palygorskite clay, and any combination thereof; and introducing a second fluid into the wellbore.