Development of Instant Linear Gel for Coal Bed Methane Gas Operations| Stephy Publishers

 


Trends in Petroleum Engineering- (TPE)| Stephy Publishers

Abstract: Previously we prepared fracturing linear gel with fossil diesel, bio-diesel and also used suspending, anti-settling agents and emulsifiers. But through this research, a novel and efficient method for the preparation of linear gel directly mixed with water, guar gum and sodium acetate together instantly. In this instead of diesel, we used water and no need to mix anti-settling agents, suspending agents, emulsifiers that resulted in 30 viscosity linear gel. Ammonium persulphate or Ammonium peroxidisulphate and enzyme-G are used for oxidation purposes to break the gel gradually at a particular static temperature. The degradation pattern observed from the breaker test showed that a reduction in gel viscosity depends on time, temperature & breaker concentration. Observations from experiments revealed that a small concentration of breakers provides rapid break compared to oxidative breakers. This article, designing of fracturing fluids describes how to use the fluid's viscosity generated by the gelling agents like guar gum for CBM operations.

Keywords: Breakers, CBM operation, Fragmentation, Linear gel, Viscosity properties

Introduction

Hydraulic fracturing typically involves millions of gallons of fluid that are pumped into oil or gas wells at high pressure to create fractures in the rock formation that allow oil or gas to flow from the fractures to the wellbore.1 The main functions of fracturing fluids are to open the fracture and to transport propping agents along the length of the fracture. They are four types of fracturing i.e. water fracturing, gelled fluids, linear gels, crosslink gels.2 The chemistry of commonly used fracturing fluids and additives are guar Figure 1. Guar has a long polymer chain and high molecular weight Figure 2. Gymer composed of Mannose and galactose sugars has a high affinity for water. When the powder is added to water, the guar particles swell and hydrate, which means the polymer molecules become associated with many water molecules and unfold and extend out into the solution which tends to overlap and hinder motion, which elevator the viscosity of the solution.

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