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New Design for Field Flowback Fluid Analysis

IP.com Disclosure Number: IPCOM000239782D
Publication Date: 2014-Dec-01
Document File: 6 page(s) / 228K

Publishing Venue

The IP.com Prior Art Database

Abstract

Measurement of carbohydrate from fluid flowback samples is used to estimate the amount of guar recovered after fracturing treatment. In this paper we show in a laboratory analysis, that the measurement of these polymers in the fluid flowback can be used as an indication of the fracture cleanup and fracture conductivity. This invention utilizes a new design to determine flowback fluid polymers concentrations as well as new field application for flowback fluid to enhance productivity in conventional and unconventional reservoirs. This new design will minimize operation time, and it is environmentally-friendly since it utilizes use of waste water for field operation. Wastewater will be used with methanogenic bacteria to enhance productivity in different reservoir applications.

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New Design for Field Flowback Fluid Analysis

Abstract

Measurement of carbohydrate from fluid flowback samples is used to estimate the amount of guar recovered after fracturing treatment. In this paper we show in a laboratory analysis, that the measurement of these polymers in the fluid flowback can be used as an indication of the fracture cleanup and fracture conductivity. This invention utilizes a new design to determine flowback fluid polymers concentrations as well as new field application for flowback fluid to enhance productivity in conventional and unconventional reservoirs. This new design will minimize operation time, and it is environmentally- friendly since it utilizes use of waste water for field operation. Wastewater will be used with methanogenic bacteria to enhance productivity in different reservoir applications

Introduction

Particularly in unconventional reservoirs, hydraulic fracturing is an essential stimulation technique to produce hydrocarbon economically. In this technique, a specially designed fracturing fluid is injected into the wellbore at a high rate and high pressure to create fractures in the formation. Most common fracturing fluids are crosslinked gel slurrries that have the ability to create the fracture geometry and carry proppants inside the created fracture.

A well-designed fracturing fluid may:

• provide good proppant conductivity (> 75% at 6,000 psi with 2 lb/ft2 30/50 ISP);

• have sufficient viscosity to created good fracture width (initial viscosity > 200 cP);
• provide good proppant transport;

• have good fluid-loss characteristics;

• provide a good viscosity break;

• have stable viscosity at BHT of approximately 200 °F;

• be a simple system to operationally execute;

• be within current economic bounds; and,

• stay within current HSE guidelines.

Various additives are in the fracturing fluid to produce an optimum fracturing fluid with desired properties. Among these additives, polymers are one of the additives that constitute the fracturing fluid. Guar carbohydrate is a well-known polymer used for formulating aqueous-based fracturing fluid. The carbohydrate polymers have a very high affinity for water and easily dissolve in water. They readily establishes a hydrogen bonds with the water molecules and are hydrated in this way (Aung Kyaw et al., 2011). They increase the viscosity of the fracturing fluid so that proppants can be easily carried downhole into the formation.

The standard procedure at the end of a hydraulic fracturing treatment is to shut-in the well for a period of hours, overnight or for several days, particularly in non-energized treatments. The extended shut-in time allows the fracture to close and allows any viscosified fluids to break to a lower viscosity. On the other hand, one of the major benefits of immediate flow-back is the use of supercharge of pressure that was built-up during the fracture treatment. Standard flow-back methods allow this pressure to d...