Rheology and Permeability of Crosslinked Polyacrylamide
Gels produced by crosslinking polyacrylamide solutions with chromium (III) have been characterized by dynamic rheology studies. To vary the gel strength, different polymer concentrations were used, while keeping the temperature, salinity, and crosslinker concentration constant.
To develop healable hydrogels with excellent mechanical properties is still a challenge topic. In this study, a novel class of physically crosslinked polyacrylamide based nanocomposite hydrogels reinforced with cellulose nanofibers (CNF) were fabricated using radical polymerization, followed by further strengthening through ferric ions via strong ionic coordination interactions between Fe 3
A Study of Polyacrylamide Based Gels Crosslinked With
Inorganically crosslinked gels rely mainly on the ionic interaction between the positively charged trivalent cation (like Cr +3 and Al +3) and the negatively charged carboxylates on the partially hydrolyzed polyacrylamide (PHPA). 6-8 This class of polymer gels is stable and can be used in reservoirs of low temperatures.
Abstract. Polymeric hydrogels are designed to serve many purposes in various fields of human endeavor. Herein, crosslinked polyacrylamide (PAM) composite hydrogels impregnated with coal fly ash (CFA) were synthesized, characterized and tested as fracture sealing agents in high water producing permeable zones in petroleum industry.
A highly crosslinked, transparent polyacrylamide gel with
Polyacrylamide gels highly (10–50%) crosslinked with N,N′-methylenebisacrylamide (BIS) provide large pore sizes but are mechanically labile.By substituting N,N′-diallyltartardiamide (DATD) for BIS, mechanical stability and firm adherence to glass walls is conferred to these gels, with only a minor decrease in pore size compared to highly BIS-crosslinked gels.
Several crosslinked polymer gels have been developed over the last 5 decades to address the different technical challenges in oil reservoirs especially conformance control operations. Among these systems, polyethylenimine (PEI) crosslinked polymer gels, which have gained a huge interest thanks to their eco-friendly aspect and thermal stability at extremely high temperatures.
Polyacrylamide : Importers, Buyers, Wholesalers
We Buy Anionic Polyacrylamide. We are looking for polymer for EOR technologies, namely for water shut off. It will be used as active component in crosslinked polymer systems (with chromium salts). It should has properties close to Alcofllood 254S BASF product which is low weight anionic polyacrylamide (0.5 mln Dalton) with low charge.
Crosslinked Polyacrylamide Composite Hydrogels Impregnated with Fly Ash: Synthesis, Characterization and Their Application as Fractures Sealant for High Water Producing Zones in Oil and Gas Wells. Journal of Polymers and Environment, Vol 26(8), pp 3294-3306. DOI: 10.1007/s10924-018-1204-9.
Investigation into the viscoelastic - Wiley Online Library
Herein, crosslinked polyacrylamide (PAM) gels reinforced with coal fly ash (CFA) were investigated for water reduction purpose during enhanced oil recovery. Polyethyleneimine (PEI) is chosen as the crosslinker.
Organically crosslinked gels have been used to control water production in high-temperature reservoirs. Most of these gels consist of a polyacrylamide-based polymer and an organic crosslinker. Polyethyleneimine (PEI) has been used as an organic crosslinker for polyacrylamide tertiary butyl acrylate (PAtBA) copolymer.
Affi-Gel Boronate Gel | | Bio-Rad
Affi-Gel ® boronate-derivatized polyacrylamide gel has affinity for coplanar adjacent cis-hydroxyl groups (cis-diols) and a high binding capacity, which provides highly efficient separation of low molecular weight molecules such as nucleotides, nucleosides, catecholamines, and sugars.
The crosslinked gel includes 30 pptg polyacrylamide (DP/EM 5015), which was prepared by hydrating 12 grams of DP/EM 5015 in 1 liter of water at 1000 rpm for 30 min. Two water sources have been tested in this strategy, Houston tap water or synthetic field water from one of the Saudi Aramco wells as listed in Table 2.
- Does high volume hydraulic fracturing cause degradation of polyacrylamide?
- Here we explore a non-chemical mechanism-mechanical degradation of polyacrylamide under ultrahigh shear rates unique to high volume hydraulic fracturing operations. The fundamental understanding enables us to estimate the extent and chemistry of degradation given geological and operational conditions.
- Does multiple exposure of Pam cause branched fractures?
- Branched fractures are likely to form during hydraulic fracture propagation, introducing polymer to multiple flow events into narrow fractures.29 To investigate the effects of multiple exposure of PAM to high deformation rates, we conducted multiple cycles of mechanical degradation.
- Are polyacrylamide based friction reducers a slickwater hydraulic fracturing fluid?
- Technol. 2018, 52, 1, 327–336 Polyacrylamide (PAM) based friction reducers are a primary ingredient of slickwater hydraulic fracturing fluids. Little is known regarding the fate of these polymers under downhole conditions, which could have important environmental impacts including decisions on strategies for reuse or treatment of flowback water.
- Does shale fracturing cause oxidative degradation of Pam?
- The shale sample adsorbed some PAM (∼30%), but importantly it catalyzed the chemical degradation of PAM, likely due to dissolution of Fe 2+ at low pH. These results provide the first evidence of radical-induced degradation of PAM under HPT hydraulic fracturing conditions without additional oxidative breaker.
