Formation and Propagation of Gel Aggregates Using Partially Hydrolyzed Polyacrylamide and Aluminum Citrate

SPE Journal ◽  
2009 ◽  
Vol 14 (03) ◽  
pp. 450-461 ◽  
Author(s):  
Abdulwahed A. Al-Assi ◽  
G. Paul Willhite ◽  
Don W. Green ◽  
C. Stanley McCool
Keyword(s):  
Residence Time ◽  
Flow Resistance ◽  
Colloidal Dispersion ◽  
Porous Matrix ◽  
High Flow ◽  
Inlet Section ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Significant Difference ◽  
Hydrolyzed Polyacrylamide ◽  
Gel System

Summary A study of the formation of gel aggregates in systems containing partially hydrolyzed polyacrylamide and aluminum citrate was completed. Under certain conditions, this system forms gel aggregates, commonly referred to as colloidal dispersion gels. Systems that formed aggregates on the exit screen of a screen viscometer also developed flow resistance when displaced through slimtubes and sandpacks. A gel system containing 1000 ppm polymer and 33.3 ppm aluminum citrate was studied in 10 darcy sandpacks 2 ft and 4 ft long. In the 2-ft sandpack, the gelant showed no significant difference in the flow resistance when compared to polymer injection when 8.7 pore volumes were injected with at residence time 0.83 hours after mixing the gelant inline prior to injection. However, a high flow resistance developed after the sandpack was shut in for 31.4 hours. The development of the high flow resistance is consistent with viscosity measurements approximately 28 hours after mixing the gelant and transistion pressures measured using the screen viscometer. In the 4-ft sandpack, gelant was injected at an interstitial velocity of 5 ft/D so that the residence time was 19.2 hours, well beyond the time where substantial gel structure was identified in screen viscometer tests. A high flow resistance developed slowly across the sandpack, beginning at the inlet section, demonstrating the formation and retention of gel aggregates in the sandpack. Our experimental data demonstrate that gel aggregates can be formed by reaction of partially hydrolyzed polyacrylamide with aluminum citrate and propagated through sandpacks. We estimate that in-depth treatment of a 10-darcy porous matrix at interstitial velocities of 5 ft/D using this gel system is limited to approximately 12 feet because retention of gel aggregates causes the permeability to decrease leading to reduction in flowrate.

Retention and Flow Characteristics of Polymer Solutions in Porous Media

1977 ◽  
Vol 17 (02) ◽  
pp. 111-121 ◽  
Author(s):  
J.G. Dominguez ◽  
G.P. Willhite
Keyword(s):  
Porous Media ◽  
Flow Rate ◽  
Polymer Solutions ◽  
Polymer Concentration ◽  
Flow Characteristics ◽  
Porous Matrix ◽  
Polymer Molecules ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Hydrolyzed Polyacrylamide ◽  
Polymer Retention

Abstract Retention and flow characteristics of a solution containing Pusher 700, a high-molecular-weight, partially hydrolyzed polyacrylamide, were studied partially hydrolyzed polyacrylamide, were studied in an 86-md core made by compacting Teflon powder. The quantity, of polymer retained during linear displacement experiments ranged from 10 to 21 mu gm/gm for polymer concentrations of 100 to 500 ppm in 2-percent NaCl solutions. Nearly all retention ppm in 2-percent NaCl solutions. Nearly all retention was attributed to mechanical entrapment because of low polymer adsorption on the Teflon surface. Flow rate affected polymer retention. In increase in velocity was accompanied by polymer retention. Polymer was expelled when the flow rate was Polymer was expelled when the flow rate was reduced. Inaccessible pore volume was about 19 percent of the total pore volume. percent of the total pore volume.Resistance factors in different sections of the core ranged Pam 2 to 10 /or solutions of 100 to 500 ppm polymer concentration in 2-percent NaCl. ppm polymer concentration in 2-percent NaCl. Permeability reduction resulting from polymer Permeability reduction resulting from polymer retention produces the resistance factor in most of the core at a velocity of 3.2 ft/D. Resistance factors in the Teflon cores were two to three times lower than those reported for natural porous media where polymer is also retained by adsorption. Introduction The search for a low-cost, effective mobility control agent is currently focused on dilute aqueous solutions containing partially hydrolyzed polyacrylamides or polysaccharides. Rheological polyacrylamides or polysaccharides. Rheological properties have been studied, including the properties have been studied, including the effects of polymer concentration, shear rate, electrolyte concentration, and type of electrolyte. Correlation of rheological data and models with the flow behavior of polymer solutions in porous media has been complicated by the many interactions that occur between the complex porous matrix and the polymer solutions. Some data have been correlated using non-Newtonian rheological models to describe the variation of fluid viscosity with the apparent shear rate that the fluid experiences as it flows through the tortuous paths in porous media. These correlations have adjustable parameters determined from the particular set of parameters determined from the particular set of data used to develop the correlation. Investigators studying partially hydrolyzed polyacrylamide solutions observed apparent polyacrylamide solutions observed apparent viscosities 5 to 20 times the values measured in a conventional viscometer at the shear rates believed to exist in the porous media. These viscosity increases were not anticipated from the rheological behavior of the fluids. Pye introduced the concept of the resistance factor to quantify this effect. Burcik observed a decrease in the mobility of brine in a Berea sandstone disk that had been previously contacted with partially hydrolyzed previously contacted with partially hydrolyzed polyacrylamide. The mobility reduction persisted polyacrylamide. The mobility reduction persisted even after 100 PV of brine had been flushed through the disk. Burcik concluded that polymer molecules retained in the pore structure by adsorption or mechanical entrapment were hydrophillic and restricted the flow of water. Gogarty made an extensive experimental study of partially hydrolyzed polyacrylamide solutions in porous media and concluded that these polymer porous media and concluded that these polymer solutions reduced the permeability of the porous media. He noosed that polymer retention in natural cores occurred by mechanical entrapment and adsorption. Both mechanisms contributed to the resistance and residual or flushed resistance factors observed with polyacrylamide solutions. Other evidence of interactions between the polymer solution and the porous matrix was found. polymer solution and the porous matrix was found. Adsorption of polymer molecules on the surface of materials present in the porous matrix has been demonstrated in batch adsorption experiments. Material-balance calculations made on the streams entering and leaving porous media following step changes in concentrations show retention of polymer molecules in the porous media. polymer molecules in the porous media. A dependence of polymer retention on flow rate has been reported. Szabo devised a set of static and flow experiments in which polymer adsorption was held to a low level by using silica sand with a small surface area. Mechanical entrapment was found to be the dominant retention mechanism in short sand packs. packs. SPEJ P. 111

scholarly journals Modeling of Partially Hydrolyzed Polyacrylamide-Hexamine-Hydroquinone Gel System Used for Profile Modification Jobs in the Oil Field

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Upendra Singh Yadav ◽  
Vikas Mahto
Keyword(s):  
Gelation Time ◽  
Temperature Stability ◽  
Oil Field ◽  
Polymer Gel ◽  
High Temperature Stability ◽  
Injection Wells ◽  
Profile Modification ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Hydrolyzed Polyacrylamide ◽  
Gel System

The cross-linked polymer gel systems are being used increasingly to redirect or modify reservoir fluid movement in the vicinity of injection wells for the purpose of permeability/profile modification job in the oil field due to their high temperature stability and capability to provide rigid gel having high mechanical strength. In this study, a partially hydrolyzed polyacrylamide-hexamine-hydroquinonegel is used for the development of polymer gel system. The experimental investigation demonstrates that the gelation time varies with polymer and crosslinker concentration and the temperature. The mathematical model is developed with the help of gelation kinetics of polymer gel and using Arrhenius equation, which relates the gelation time with polymer, crosslinker concentrations, and temperature. The developed model is solved with the help of multivariate regression method. It is observed in this study that the theoretical values of gelation time have good agreement with the experimental values.

scholarly journals On-Site Pilot Testing of Hospital Wastewater Ozonation to Reduce Pharmaceutical Residues and Antibiotic-Resistant Bacteria

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 684
Author(s):  
Sofia Svebrant ◽  
Robert Spörndly ◽  
Richard H. Lindberg ◽  
Therese Olsen Sköldstam ◽  
Jim Larsson ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
High Flow ◽  
Resistant Bacteria ◽  
Municipal Wastewater Treatment ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Untreated Wastewater ◽  
Significant Difference ◽  
Hospital Sewage

Hospital sewage constitutes an important point source for antibiotics and antibiotic-resistant bacteria due to the high antibiotic use. Antibiotic resistance can develop and cause problems in sewage systems within hospitals and municipal wastewater treatment plants, thus, interventions to treat hospital sewage on-site are important. Ozonation has proven effective in treating relatively clean wastewater, but the effect on untreated wastewater is unclear. Therefore, we piloted implementation of ozonation to treat wastewater in a tertiary hospital in Uppsala, Sweden. We measured active pharmaceutical ingredients (APIs) using liquid chromatography-mass spectrometry and antibiotic-resistant Enterobacteriaceae using selective culturing pre- and post-ozonation. Comparing low (1 m3/h) and high (2 m3/h) flow, we obtained a ‘dose-dependent’ effect of API reduction (significant reduction of 12/29 APIs using low and 2/29 APIs using high flow, and a mean reduction of antibiotics of 41% using low vs. 6% using high flow, 25% vs. 6% for all APIs). There was no significant difference in the amount of antibiotic-resistant Enterobacteiaceae pre- and post-ozonation. Our results demonstrate that ozonation of untreated wastewater can reduce API content. However, due to the moderate API decrease and numerous practical challenges in the on-site setting, this specific ozonation system is not suitable to implement at full scale in our hospital.

Difference in Critical Reynolds Number Between Hagen-Poiseuille and Plane Poiseuille Flows

2001 ◽  
Author(s):  
Hidesada Kanda
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Poiseuille Flow ◽  
Average Velocity ◽  
Critical Reynolds Number ◽  
Inlet Section ◽  
Parallel Plates ◽  
Plane Poiseuille Flow ◽  
Contraction Ratio ◽  
Significant Difference

Abstract For plane Poiseuille flow, results of previous investigations were studied, focusing on experimental data on the critical Reynolds number, the entrance length, and the transition length. Consequently, concerning the natural transition, it was confirmed from the experimental data that (i) the transition occurs in the entrance region, (ii) the critical Reynolds number increases as the contraction ratio in the inlet section increases, and (iii) the minimum critical Reynolds number is obtained when the contraction ratio is the smallest or one, and there is no-shaped entrance or straight parallel plates. Its value exists in the neighborhood of 1300, based on the channel height and the average velocity. Although, for Hagen-Poiseuille flow, the minimum critical Reynolds number is approximately 2000, based on the pipe diameter and the average velocity, there seems to be no significant difference in the transition from laminar to turbulent flow between Hagen-Poiseuille flow and plane Poiseuille flow.

A new injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide and nanohydroxyapatite as scaffold for osteochondral regeneration

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 9089-9096 ◽  
Author(s):  
Newsha Koushki ◽  
Ali Asghar Katbab ◽  
Hossein Tavassoli ◽  
Azadeh Jahanbakhsh ◽  
Mohammad Majidi ◽  
...  
Keyword(s):  
Partially Hydrolyzed Polyacrylamide ◽  
Osteochondral Repair ◽  
Nanocrystalline Hydroxyapatite ◽  
Hydrolyzed Polyacrylamide ◽  
Osteochondral Regeneration ◽  
Novel Scaffold ◽  
Chromium Acetate

Fabrication of an injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide (HPAM), nanocrystalline hydroxyapatite (nHAp), and chromium acetate (Cr(iii)) as a novel scaffold for osteochondral repair has been attempted.

scholarly journals PERFORMANCE COMPARISON OF LASTON AC-WC BASED ON AGGREGATE GRADATION SPECIFICATIONS

2018 ◽  
Vol 2 (02) ◽  
pp. 151
Author(s):  
Devi Yulita Metasari ◽  
Akhmad Hasanuddin ◽  
Dewi Junita Koesoemawati
Keyword(s):  
Flow Rate ◽  
Outer Layer ◽  
Performance Comparison ◽  
High Flow ◽  
T Test ◽  
Aggregate Gradation ◽  
Significant Difference ◽  
Bitumen Content ◽  
Asphalt Content ◽  
Paired T Test

Laston AC-WC is the outer layer of the pavement that is directly related to the outside, so a strong mixture is required. One of the major effects is the aggregate gradation.This experiment aims to find out the comparison of Laston AC-WC performance between mixtures used aggregat egradation above and below the restriction zone. Each mixture used 6 variations of asphalt content and there were 3 specimens on each variation of bitumen content. The asphalt contents used were 5,5%; 6%; 6,5%; 7%; 7,5% dan 8%. From the results of the experiments, the mixture with the aggregate above the restriction zone at 7% and 7.5% asphalt content had a density value of 2.13 gr / cc and 2.12 gr / cc respectively; VMA value of 15.49% and 15.91%; VFA values ​​of 80.48% and 79.98%; VIM value of 3.16% and 3.18%; stability value of 3013.58 kg and 2332.57 kg; flow value of 2.47 mm and 2.18 mm; as well as MQ values ​​of 1222.25 kg / mm and 1184.59 kg / mm. While on the mixture with the aggregate under the restriction zone in the asphalt content of 7% and 7.5% obtained density value of 2.11 gr / cc and 2.14 gr / cc; VMA value of 17.21% and 16.3%; VFA value of 71.21% and 78.65%; VIM value of 4.99% and 3.49%; stability value of 2518,75 kg and 3234,72 kg; flow values ​​of 2 mm and 2.07 mm; as well as the MQ value of 1259.37 kg / mm and 1623.54 kg / mm. From the results are analyzed Paired T test and found that the value of flow has a significant difference. The high flow rate was found in the mixture with the aggregate above the restriction zone at 7% asphalt content, so this mixture is more durable due to good flexibility. Laston AC-WC merupakan lapisan terluar perkerasan yang berhubungan langsung dengan keadaan luar, sehingga dibutuhkan campuran yang kuat. Salah satu yang berpengaruh besar adalah gradasi agregat yang digunakan. Penelitian ini bertujuan untuk mengetahui perbandingan kinerja laston AC-WC antara campuran yang menggunakan gradasi di atas dengan di bawah daerah larangan. Penelitian ini dilakukan terhadap campuran laston AC-WC. Masing-masing campuran menggunakan 6 variasi kadar aspal dan terdapat 3 benda uji pada setiap kadar aspal. Kadar aspal yang digunakan adalah 5,5%; 6%; 6,5%; 7%; 7,5% dan 8%. Dari hasil penelitian, campuran dengan agregat di atas daerah larangan pada kadar aspal 7% dan 7,5% memiliki nilai density berturut-turut sebesar 2,13 gr/cc dan 2,12 gr/cc; nilai VMA sebesar 15,49% dan 15,91%; nilai VFA sebesar 80,48% dan 79,98%; nilai VIM sebesar 3,16% dan 3,18%; nilai stabilitas sebesar 3013,58 kg dan 2332,57 kg; nilai flow sebesar 2,47 mm dan 2,18 mm; serta nilai MQ sebesar 1222,25 kg/mm dan 1184,59 kg/mm. Sedangkan pada campuran dengan agregat di bawah daerah larangan pada kadar aspal 7% dan 7,5% didapatkan nilai density sebesar 2,11 gr/cc dan 2,14 gr/cc; nilai VMA sebesar 17,21% dan 16,3%; nilai VFA sebesar 71,21% dan 78,65%; nilai VIM sebesar 4,99% dan 3,49%; nilai stabilitas sebesar 2518,75 kg dan 3234,72 kg; nilai flow sebesar 2 mm dan 2,07 mm; serta nilai MQ sebesar 1259,37 kg/mm dan 1623,54 kg/mm. Dari hasil tersebut dilakukan analisa Uji T Berpasangan dan didapatkan bahwa nilai flow memiliki perbedaan yang signifikan. Nilai flow yang tinggi terdapat pada campuran dengan agregat di atas daerah larangan pada kadar aspal 7%, sehingga campuran ini lebih tahan lama dikarenakan memiliki kelenturan yang baik.

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