Abstract
The use of polymer gel for water control and oil addition is a common technical method in oilfield development. The polymer and hydrated bentonite react under the action of an organic crosslinking agent to form a composite gel. The particle-size change and microstructure of the composite gel were analyzed via shear thinning, thixotropic, viscoelastic, and start-up stress rheology experiments. The experimental results show that the polyacrylamide/bentonite organic crosslinked composite gel was a gel system with bentonite as the core aggregate structure, and the large particle-size distribution was mostly increased with increasing crosslinker content. The composite gel presented shear thinning characteristics, the content of bentonite or crosslinking agent was increased, and the shear resistance was stronger at a high shear rate. The composite gel exhibited positive thixotropic properties, and the thixotropy increased with increasing bentonite content. The composite gel had good viscoelastic characteristics, the elastic characteristics of the composite gel showed more significantly with bentonite increases, and the viscosity of the composite gel showed its characteristics more significantly with the crosslinking agent increased. After loading at a rate on the composite gel, the shear stress increased significantly with time and reached its maximum value, and then the shear stress decreased and gradually stabilized.
Highlights
For the middle and late stages of oilfield development, the water content increases significantly because the original layer, continuous mining, or improper construction operation lead to intensified interlayer heterogeneity and serious turbulence [1,2,3,4]
Aqueous solution and the volume of aggregate with bentonite becoming after crosslinking, the of polyacrylamide stretching in aqueous solution and the volume oflarge aggregate with bentonite viscosity the composite gel decreased at a low of shear and increased at a highatshear becomingoflarge after crosslinking, the viscosity therate composite gel decreased a lowrate
The elastic composite gel decreased with increasing crosslinker agent content, and the loss modulus increased the crosslinking of polyacrylamide and theThe formation of of aggregates withformed bentonite increased
Summary
For the middle and late stages of oilfield development, the water content increases significantly because the original layer, continuous mining, or improper construction operation lead to intensified interlayer heterogeneity and serious turbulence [1,2,3,4]. Bentonite can be used to prepare nanocomposites because it contains a large amount of MMT [Na1/3 (Al5/3 Mg1/3 ) Si4 O10 (OH)2 ], which consists of aluminum oxyhydroxide octahedral sheets sandwiched between two layers of siloxane tetrahedral sheets [11]. These molecules, which are stacked on top of each other, are held together by the van der Waals force and are separated from each other by a 1 nm slit. The particle size and microstructure of the composite gel were studied, and the internal structure and mechanics of the composite hydrogel were analyzed using rheological methods
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
