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Ecofriendly Chemical for Gravel Pack Application

IP.com Disclosure Number: IPCOM000238309D
Publication Date: 2014-Aug-15
Document File: 4 page(s) / 23K

Publishing Venue

The IP.com Prior Art Database

Abstract

Flaxseed gum, as a polymer substance produced from flaxseeds hull, is non-toxic matter usually added to food to increase its viscosity and elasticity. Flax gum forms a strong viscoelastic hydrocolloid in water and shows capacity to carry the sand, which can be used for sand settling in low temperature horizontal wells.

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Ecofriendly Chemical for Gravel Pack Application

Abstract

Flaxseed gum, as a polymer substance produced from flaxseeds hull, is non-toxic matter usually added to food to increase its viscosity and elasticity. Flax gum forms a strong viscoelastic hydrocolloid in water and shows capacity to carry the sand, which can be used for sand settling in low temperature horizontal wells.

Introduction:

Packing of each perforation with gravel is the key for obtaining high productivity from oil reservoirs. Gravel packing consists of installing a downhole filter in the well to control the entry of formation material while allowing the production of reservoir fluids. The primary objective of gravel packing a well is filling the annulus with properly-sized gravel which ensures that the formation sand is not produced to the surface.

A variety of water based linear gels have been used as gravel transport fluids such as Clarified xanthan gum1, Guar gum2, Guar gum derivatives3 (HPG- Hydroxy propyl guar, CMHPG- Carboxy-methyl Hydroxy-propyl guar) and HEC4 (Hydroxy-ethyl cellulose). They are all biodegradable. Gravel packs performed with linear gel transport fluids are referred to as slurry packs, gels, or viscous packs. 

The present work discloses a new food grade chemical – Flaxseed gum5, which can be used for preventing sand settling in low temperature horizontal wells during a gravel packing job.

Flaxseed gum gel is a versatile and easy to mix as viscosified fluid system. This fluid can be used in gravel packing, fluid loss control, friction pressure reduction, and other applications benefiting from a shear thinning. It is a biopolymer gelling agent, which has novel rheological properties that enable the fluid to suspend sand similar to a cross-linked gel, or produce a slick brine to reduce pumping friction pressures.

Flaxseed gum gel enables a simple mixing procedure and rapid viscosity development in a number of water-based fluids

Description:

Flaxseed gum is extracted from the Flax seed coat (Hull). Flax seeds come in two basic varieties: (1) brown; and (2) yellow or golden (also known as golden linseeds). Flax seed gum is a mixture of polysaccharide (mainly Arabinoxylans) and a small amount of protein. As compare to other gums, Flaxseed gum forms a strong viscoelastic colloid6 in water. It is widely used in health care products7, pharmaceuticals8-9 and cosmetic industry10 and as thickener in food industries5. Flax seeds are a food and fiber crop that is grown in colder regions of the world. Flax seeds are food grade material and therefore, they are environmental friendly and non-hazardous in nature.

Flaxseed gel develops good viscosity when fully hydrated. This work is related to sand carrying properties of the Flax gum gel in low temperature horizontal wells. The gel allows the placing of proppant in the desire zone.  Its viscosity decreases with time and temperature. Once proppant placed inside the zone, gel gets broken with time flow back. Flaxseed gel...