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Nano material polymer matrix composition for conformance applications

IP.com Disclosure Number: IPCOM000241989D
Publication Date: 2015-Jun-11
Document File: 4 page(s) / 199K

Publishing Venue

The IP.com Prior Art Database

Abstract

Conformance applications use OCP (Organically Crosslinking Polymer) system which comprises copolymer of acrylamide and t-butyl acrylate (PAtBA) crosslinked with polyethyleneimine (PEI) (for e.g., H2Zero system). Well operations often create drastic changes in temperature and pressure at downhole. Due to these changes in temperature, the cross-linked polymers are known to undergo thermal expansion/ contraction. It could initiate crack on surface of the polymer that could in turn deteriorate the polymer. The HTHP wells are more likely to face this problem. This paper presents the blend of nano Zirconium Tungstate (ZrW2O8) and organically cross-linkable polymer (OCP) for conformance applications to improve thermal stability of the polymer. ZrW2O8 has highest negative thermal expansion co-efficient (CTE) value and is known to improve strength and other mechanical properties of the blended polymer. It also adds an advantage by reducing the density of the blend (light weight hybrid).

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Nano material polymer matrix composition for conformance applications

ABSTRACT:

Conformance applications use OCP (Organically Crosslinking Polymer) system which comprises copolymer of acrylamide and t-butyl acrylate (PAtBA) crosslinked with polyethyleneimine (PEI) (for e.g., H2Zero system). Well operations often create drastic changes in temperature and pressure at downhole. Due to these changes in temperature, the cross-linked polymers are known to undergo thermal expansion/ contraction. It could initiate crack on surface of the polymer that could in turn deteriorate the polymer. The HTHP wells are more likely to face this problem.

This paper presents the blend of nano Zirconium Tungstate (ZrW2O8) and organically cross-linkable polymer (OCP) for conformance applications to improve thermal stability of the polymer. ZrW2O8 has highest negative thermal expansion co-efficient (CTE) value and is known to improve strength and other mechanical properties of the blended polymer. It also adds an advantage by reducing the density of the blend (light weight hybrid).

Introduction:

Conformance applications use OCP (Organically Crosslinking Polymer) system which comprises copolymer of acrylamide and t-butyl acrylate (PAtBA) crosslinked with polyethyleneimine (PEI) (for e.g., H2Zero system). This system is well known to address conformance problems such as water coning/cresting, high-permeability streaks, gravel-pack isolation, fracture shutoff, and casing-leak repair.

However, well operations often involve drastic changes in temperature and pressure in the near wellbore region. Due to sudden changes in the temperature cycle, cross-linked polymers are known to undergo thermal expansion. It leads to initiate crack on the surface of the polymer, once the crack is initiated, it can lead to deterioration of the polymer. HTHP oil and gas wells are more likely to face this problem.

In the recent years, nano Zirconium Tungstate usage has received significant attention in various industrial applications. (US7824763 B2) It was experimentally proved to reduce the thermal stress and improve mechanical properties of polymer. The nano Zirconium Tungstate material is proven to with stand high thermal and stress cycles. (US8703842 B1, US7824763 B2 and US2004/0214377 A1).

Scope of Invention:

The current invention is to blend nano Zirconium Tungstate with organically cross-linkable polymer (OCP) matrix systems (like H2Zero system). The addition gives the following major advantages to the Conformance system or to RPM (relative permeability modifiers) systems:

1.      Withstands high thermal and stress cycles to substantially increase the life of the system.

2.      Reduces thermal expansion of cured resin and improves mechanical properties.(US8829694 B1)

3.      Thermal degradation was significantly low which was confirmed by TGA analysis.

4.      Lightweight hybrid.

Experiments:

10% w/v of ZrW2O8 nano material was dispersed in H2Zero and heated at 175 oF (80 oC) for 4 hours. Another sample wa...