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Use of Nanoscale Particles of Elastic and/or Swellable Material in Well Bore Applications

IP.com Disclosure Number: IPCOM000239783D
Publication Date: 2014-Dec-01
Document File: 5 page(s) / 21K

Publishing Venue

The IP.com Prior Art Database

Abstract

The use of nanoscale particles of elastic and/or swellable material in well bore applications, e.g., in settable compositions is disclosed. As used herein, the term "settable composition" refers to any composition that will set over time to form a hardened mass. One example of a settable composition comprises hydraulic cement and water. Subterranean applications that may involve settable compositions include, but are not limited to, primary cementing and remedial cementing operations.

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Use of Nanoscale Particles of Elastic and/or Swellable Material in Well Bore Applications

Abstract

    The use of nanoscale particles of elastic and/or swellable material in well bore applications, e.g., in settable compositions is disclosed. As used herein, the term "settable composition" refers to any composition that will set over time to form a hardened mass. One example of a settable composition comprises hydraulic cement and water. Subterranean applications that may involve settable compositions include, but are not limited to, primary cementing and remedial cementing operations.

Description

    Settable compositions are used in primary cementing operations whereby pipe strings, such as casing and liners, are cemented in well bores. In performing a primary cementing operation, a settable composition is pumped into an annular space between the walls of a well bore and a pipe string disposed therein. The settable composition sets in the annular space, thereby forming an annular sheath of hardened cement (e.g., a cement sheath) that supports and positions the pipe string in the well bore and bonds the exterior surface of the pipe string to the walls of the well bore.

    Settable compositions may also be used in remedial cementing operations, such as sealing voids in a pipe string or a cement sheath. As used herein the term "void" refers to any type of space, including fractures, holes, cracks, channels, spaces, and the like. Such voids may include: holes or cracks in the pipe strings; holes, cracks, spaces, or channels in the cement sheath; and very small spaces (commonly referred to as "microannuli") between the cement

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sheath and the exterior surface of the well casing or formation. Sealing such voids may prevent the undesired flow of fluids (e.g., oil, gas, water, etc.) and/or fine solids into, or from, the well bore. The use of finer sized particles is beneficial in the sealing of very small voids.

    Settable compositions disclosed herein contain nanoscale particles (e.g., rubber nanoscale particles) that are elastic and/or react to swell upon contact with downhole fluids. The nanoscale particles in the settable compositions described herein have a size in the range of from about 1 nm to about 1┬Ám and, more particularly, in the range of from about 20 nm to about 400 nm. When cement-sheath deterioration occurs, exposing the cement matrix or cement-sheath surfaces to downhole fluids, the nanoscale particles respond and seal cracks or fissures, thereby restoring cement-matrix integrity and zonal isolation. Well cements are potentially exposed to several fluid types during service, including liquid and gaseous hydrocarbons, water, brines and/or carbon dioxide. Thus, depending on the anticipated wellbore environment, it is desirable to incorporate nanoscale particles that are able to respond to one or more types of downhole fluids. Swellable particles suitable for use herein generally swell under downhole conditions. The actu...