{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T13:17:51Z","timestamp":1753881471285,"version":"3.41.2"},"reference-count":10,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2021,10,31]],"date-time":"2021-10-31T00:00:00Z","timestamp":1635638400000},"content-version":"vor","delay-in-days":303,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51722406","61573018","51874335"],"award-info":[{"award-number":["51722406","61573018","51874335"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007129","name":"Natural Science Foundation of Shandong Province","doi-asserted-by":"publisher","award":["JQ201808"],"award-info":[{"award-number":["JQ201808"]}],"id":[{"id":"10.13039\/501100007129","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","award":["18CX02097A"],"award-info":[{"award-number":["18CX02097A"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100018537","name":"National Science and Technology Major Project","doi-asserted-by":"publisher","award":["2016ZX05025001-006"],"award-info":[{"award-number":["2016ZX05025001-006"]}],"id":[{"id":"10.13039\/501100018537","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Complexity"],"published-print":{"date-parts":[[2021,1]]},"abstract":"<jats:p>In view of the problems of low permeability, high oil viscosity and freezing point, and low productivity of single well in Luo 321 and Luo 36 blocks of Luojia Oilfield, the chemical viscosity\u2010reducing cold production technology was studied. By analyzing the properties of crude oil, it is concluded that the reason for high viscosity and high freezing point is the high content of asphaltene, pectin, and wax. The viscosity is mainly affected by asphaltene; the wax precipitation point and pour point are mainly affected by the wax; and the solidification point is affected by the wax and asphaltene. The treatment idea of reducing viscosity and inhibiting wax is determined. By compounding the synthetic pour point depressant POA\u2010VA and the viscosity reducer DBD\u2010DOPAMA, the effect of reducing the viscosity and freezing point of crude oil was evaluated. PD\u20107 (POA\u2010VA 40%, DBD\u2010DOPAMA 50%, and P\u201010C 10%) system was selected as the optimal formula. When the concentration of the system is 10%, the viscosity reduction rate reaches 95.2%; the freezing point can reduce by 10.2\u00b0C; it has good oil sample adaptability, salinity resistance, and temperature resistance; and the oil washing rate can reach more than 60%. The oil displacement system was injected into the formation by means of multiconcentration and multislug and was applied in the field of Luo 321\u20102 Well. A total of 500\u2009t of the oil displacement system was injected, and the effect of measures lasted for 400 days, with a cumulative oil increase of 883\u2009t. It has been applied in different blocks 30 times and achieved a good field application effect.<\/jats:p>","DOI":"10.1155\/2021\/3046584","type":"journal-article","created":{"date-parts":[[2021,10,31]],"date-time":"2021-10-31T16:35:05Z","timestamp":1635698105000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Development and Application of Efficient Oil Displacement System for Middle\u2010Low Permeability and High Pour\u2010Point Heavy Oil Reservoirs"],"prefix":"10.1155","volume":"2021","author":[{"given":"Zhenfu","family":"Ma","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6691-6762","authenticated-orcid":false,"given":"Kai","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Mengjie","family":"Zhao","sequence":"additional","affiliation":[]},{"given":"Lu","family":"Liu","sequence":"additional","affiliation":[]},{"given":"Chao","family":"Zhong","sequence":"additional","affiliation":[]},{"given":"Jian","family":"Wang","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2021,10,31]]},"reference":[{"key":"e_1_2_8_1_2","first-page":"561","article-title":"Study on the properties of hydroxysulfobetaine suitable for high temperature and high salt reservoirs","volume":"30","author":"Ding W.","year":"2013","journal-title":"Oil Field Chemical"},{"key":"e_1_2_8_2_2","first-page":"121","article-title":"Optimization and performance evaluation of 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