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Title: Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids

Abstract

This patent describes a drilling fluid additive for reducing lost circulation of aqueous drilling fluids in a borehole penetrating an underground formation. The process comprises a water absorbent polymer which expands upon absorbing water. The polymer is encapsulated by a waxy substance having a melting point below the temperature of the underground formation and above the bottom hole circulating temperature of the drilling fluid within the borehole.

Inventors:
Publication Date:
OSTI Identifier:
6534103
Patent Number(s):
US 4664816
Assignee:
Texaco Inc., White Plains, NY
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 28 May 1985
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; DRILLING FLUIDS; ADDITIVES; LOST CIRCULATION; ADSORBENTS; EXPANSION; MELTING POINTS; NATURAL GAS WELLS; OIL WELLS; POLYMERS; TEMPERATURE DEPENDENCE; FLUIDS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE; WELLS; 020300* - Petroleum- Drilling & Production; 030300 - Natural Gas- Drilling, Production, & Processing

Citation Formats

Walker, C O. Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids. United States: N. p., 1987. Web.
Walker, C O. Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids. United States.
Walker, C O. 1987. "Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids". United States.
@article{osti_6534103,
title = {Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids},
author = {Walker, C O},
abstractNote = {This patent describes a drilling fluid additive for reducing lost circulation of aqueous drilling fluids in a borehole penetrating an underground formation. The process comprises a water absorbent polymer which expands upon absorbing water. The polymer is encapsulated by a waxy substance having a melting point below the temperature of the underground formation and above the bottom hole circulating temperature of the drilling fluid within the borehole.},
doi = {},
url = {https://www.osti.gov/biblio/6534103}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 12 00:00:00 EDT 1987},
month = {Tue May 12 00:00:00 EDT 1987}
}