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Single Step Treatment Solution for Primary and Secondary Fines Control

IP.com Disclosure Number: IPCOM000241114D
Publication Date: 2015-Mar-27
Document File: 6 page(s) / 194K

Publishing Venue

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Abstract

Sand production is a common problem during oil well completions. It is unwanted as it can plug wells, erode equipment and reduce well productivity. The authors propose the use of positively charged nanotubes as sand control agent. It will act as a primary treatment and will also take care of any future fine generation. Cationic species will attract the fine particles and hollow nano tubes will contribute to mechanical strength and permeability.

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Single Step Treatment Solution for Primary and Secondary Fines Control

ABSTRACT:

Sand production is a common problem during oil well completions. It is unwanted as it can plug wells, erode equipment and reduce well productivity. The authors propose the use of positively charged nanotubes as sand control agent. It will act as a primary treatment and will also take care of any future fine generation. Cationic species will attract the fine particles and hollow nano tubes will contribute to mechanical strength and permeability.

INTRODUCTION:

The invention discloses about the use of surface modified Carbon nanotubes ,CNC,  as tool for controlling sand production. The properties and application of Carbon nano tube and the surface modifying agent poly DADMAC, Polydiallyldimethylammonium chloride ,is clearly mentioned below.

Carbon nanotubes

Carbon nanotubes (CNTs) are cylindrical nanostructures which are allotropes of carbon. There are several advantages linked with the CNTs that make them suitable for use in various practical purposes. Due to their small size, the aspect ratio i.e. length to diameter ratio is very large which provides a very large area per unit volume required for a chemical reaction.[1]  CNTs are the strongest in terms of tensile strength and stiffest in terms of tensile elastic modulus. CNTs gain strength results from the covalent sp2 bonds formed between the individual carbon atoms.

Figure 1: Carbon Nanotube [2]

Owing to their large area per volume available for reaction and adsorption, CNTs are excellent base for transporting chemicals.[1] The agents for secondary sand consolidation can be coated on the surface of CNTS and can be transported downhole. As CNTs are known to exhibit high tensile strength, the consolidated formation is expected to bare the overburden pressures after the

treatment. An important feature of a sand consolidation process is exhibited in the regain permeability. Their hollow structure provides a porous space for fluid to flow thus increasing the regain conductivity after the treatment.

Polydiallyldimethylammonium chloride

Polydiallyldimethylammonium chloride (shortened poly DADMAC or PDDA) is a homopolymer of diallyldimethylammonium chloride (DADMAC). The molecular weight of polyDADMAC is typically in the range of hundreds of thousands of grams per mole, and even up to a million for some products. PolyDADMAC is usually delivered as a liquid concentrate having a solids level in the range of 10 to 50%.The structure of poly DADMAC is given below,

       
   
 
   

Figure 3: Structure of PolyDADMAC

 
 

PolyDADMAC polymers were first prepared and studied in 1957 by Professor George Butler at the University of Florida. [3] It was remarkable as it was soluble in water in contrast at the time to other known synthetic polymers formed by polymerization of monomers containing more than one vinyl functionality. The structure and reaction path was determined in 2002 with NMR studies.

The monomer DADMAC is formed by reacting two equivale...