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EMULSION MIXER SKID FOR CEA/IEA MIXING

IP.com Disclosure Number: IPCOM000237019D
Publication Date: 2014-May-27
Document File: 3 page(s) / 418K

Publishing Venue

The IP.com Prior Art Database

Abstract

Emulsified hydrochloric acid, better known as carbonate emulsion acid (CEA), is often used in oilfield matrix acidizing and acid fracturing operations. A modified version of CEA has been recently proposed for Simultaneous Acid and Proppant Fracturing (SAPF). This new version is called invert emulsion acid (IEA) and it has the same base formulation of a conventional CEA but including oil-soluble polymers that modify the main properties of CEA (retardation, fluid loss, rheology etc.). In off-shore oilfield operations, CEA is usually mixed on-the-fly because of limited tank storage capacity in offshore vessels and platforms. Not having dedicated standard equipment to mix CEA on-the-fly, can result in poor mixing resulting in low viscosity emulsions because of low shear while mixing or simply no emulsification at all because of cross contamination. A compact on-the-fly mixer (skid type) that can be easily transported and fit in small available spaces of a stimulation vessel or platform is presented.

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EMULSION MIXER SKID FOR CEA/IEA MIXING

Abstract

Emulsified hydrochloric acid, better known as carbonate emulsion acid (CEA), is often used in oilfield matrix acidizing and acid fracturing operations. A modified version of CEA has been recently proposed for Simultaneous Acid and Proppant Fracturing (SAPF). This new version is called invert emulsion acid (IEA) and it has the same base formulation of a conventional CEA but including oil-soluble polymers that modify the main properties of CEA (retardation, fluid loss, rheology etc.).

In off-shore oilfield operations, CEA is usually mixed on-the-fly because of limited tank storage capacity in offshore vessels and platforms. Not having dedicated standard equipment to mix CEA on-the-fly, can result in poor mixing resulting in low viscosity emulsions because of low shear while mixing or simply no emulsification at all because of cross contamination.

A compact on-the-fly mixer (skid type) that can be easily transported and fit in small available spaces of a stimulation vessel or platform is presented.

Introduction

A static mixer as illustrated below in Figures 1 and 2 was constructed to improve viscosity of the CEA pumped in oilfield operations. The static mixer consists of 12 mixing elements and each element consists of 2 half-ellipsis perpendicular to each other. The elements were welded together in such a manner to allow no gap between their external border and the 4-inch pipe coupled to the discharge of the centrifugal pump.

With the use of this static mixer, CEA viscosity went from 30 cP to 100 cP (Fann® 35 viscometer reading at 300 rpm).

Description

Based on successful field experiences with the st...