{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T17:06:11Z","timestamp":1790096771322,"version":"4.0.1"},"reference-count":25,"publisher":"American Chemical Society (ACS)","issue":"37","license":[{"start":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:00:00Z","timestamp":1788393600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52421002"],"award-info":[{"award-number":["52421002"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["U23B2084"],"award-info":[{"award-number":["U23B2084"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["U25D9018"],"award-info":[{"award-number":["U25D9018"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,22]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Preferential flow through high-permeability pathways remains a central challenge for polymer-based conformance control in reservoirs where high temperature, high salinity, and strong heterogeneity compromise gel stability and selectivity. Here, a delayed-gelation organic\u2013inorganic gel was formulated from a microbranched cationic copolymer, P(AM-co-DMDAAC), a urea\u2013formaldehyde\/phenol\u2013formaldehyde prepolymer cross-linker, and silica nanoparticles. The precursor retained injectability and formed a grade H gel within 15 h at 90 \u00b0C in 240,000 ppm brine. Transmission electron microscopy and elemental mapping confirmed a continuous polymer network with uniformly distributed silica, indicating effective nanoscale reinforcement. Core flooding, computed tomography, scanning electron microscopy, and low-field nuclear magnetic resonance were used to correlate network formation with pore occupation and flow redistribution. After in situ gelation, steady-state water-flooding pressure drops increased from 0.052 to 0.28 MPa in a 100 mD core and from 0.015 to 2.25 MPa in a 1000 mD core, corresponding to plugging efficiencies of 81.4 and 99.3%, respectively. Imaging and relaxation responses revealed longitudinally extended gel zones, adherent layers on carbonate surfaces, and shorter pore-fluid relaxation times, demonstrating reduced mobility and enhanced confinement. In parallel cores with a permeability contrast of 10, the high-permeability\/low-permeability flow ratio reversed from approximately 10:1 to 1:5. These results establish a structure\u2013morphology\u2013transport relationship for silica-reinforced cationic polymer gels and show how nanoscale network reinforcement enables selective plugging and controllable flow reallocation in heterogeneous porous media.<\/jats:p>","DOI":"10.1021\/acsomega.6c06184","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T20:34:27Z","timestamp":1788467667000},"page":"56071-56081","source":"Crossref","is-referenced-by-count":0,"title":["Selective Plugging\nand Flow Reallocation Characteristics\nof a Time-Controllable Silica-Reinforced Cationic Polymer Gel in High-Temperature,\nHigh-Salinity Heterogeneous Porous Media"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-3926-2787","authenticated-orcid":true,"given":"Yipeng","family":"Zhong","sequence":"first","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiongfei","family":"Liu","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kun","family":"Zhang","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Tan","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kuangchen","family":"Jing","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guangbo","family":"Lu","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fujian","family":"Zhou","sequence":"additional","affiliation":[{"name":"China University of Petroleum (Beijing) , , ,","place":["Beijing, China, 102249"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"2026092211040156700_cit1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cis.2021.102363","article-title":"Progress of polymer\ngels for conformance control in oilfield","volume":"289","author":"Kang","year":"2021","journal-title":"Adv.\nColloid Interface Sci."},{"issue":"2","key":"2026092211040156700_cit2","doi-asserted-by":"publisher","first-page":"450","DOI":"10.1007\/s12182-021-00546-1","article-title":"Water shutoff and conformance improvement:\nan introduction","volume":"18","author":"Seright","year":"2021","journal-title":"Pet. 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