Characterization of terpolymers containing 1,2,4‐oxadiazolic pendant groups with potential application as workover fluids

Abstract

Presence of planar, bulky heterocyclic pendant groups, attached to polymer chains, alters the thermal properties and, once gelled, they modify their rheological properties as well. The authors report generation of stiff gels coming from terpolymers containing 1,2,4-oxadiazolic pendant groups, obtained by chemical modification of commercial polyacrylonitrile. The gels formed in basic aqueous solutions were compared and the effect of substituents linked to the heterocycles on thermal stability and viscoelastic properties was also analyzed. The structural modifications were followed by FTIR. The potential use of these terpolymers as workover fluids is discussed.

From the Lab to the Field: Organic Materials for Industrial Applications and Environmental Remediation

“…Treatment of the PAN with different acyl chlorides produced terpolymers with tetrazole, cyano and 1,3,4-oxadizoles pendant groups (2), which were soluble in polar solvents and presented interesting rheological behavior that allow their use as FF in underground formations. [42] Also, the authors explored different synthetic methodology to obtain other series of copolymers (3) which are summarized in the Figure 5. [43][44][45] Alternatively, Vega et al described the synthesis of copolymers with 1,3-isoxazole groups pendant groups from hydro- lyzed polyacrylamide (HPAM), a polymer of variety and different applications in oil gas industry.…”

“…Then, amidoximes reacted with acyl chloride via intramolecular cyclisation originating 1,2,4‐oxadiazole groups substituents ( 1 ). Treatment of the PAN with different acyl chlorides produced terpolymers with tetrazole, cyano and 1,3,4‐oxadizoles pendant groups ( 2 ), which were soluble in polar solvents and presented interesting rheological behavior that allow their use as FF in underground formations [42] . Also, the authors explored different synthetic methodology to obtain other series of copolymers ( 3 ) which are summarized in the Figure 5 [43–45] …”

New copolymers with heterocyclic pendant groups obtained from PVC using microwave‐assisted process

“…Conversely, the polymers containing heterocyclic moieties have a great interest due to their intriguing topologic architecture and vast application in many fields 7. Previously, we have described the synthesis of copolymers with heterocyclic pendant groups, by chemical modification, for its use as a gravel‐pack carrier fluid,8 completion fluid or fracturing fluid 9, 10. The properties of these new materials are significantly different from their precursors.…”

“…7 Previously, we have described the synthesis of copolymers with heterocyclic pendant groups, by chemical modification, for its use as a gravel-pack carrier fluid, 8 completion fluid or fracturing fluid. 9,10 The properties of these new materials are significantly different from their precursors. With regard to safety, this methodology avoids the use of monomers that are, in most cases, very toxic.…”