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2025/10/2502:22:35 news 1162

Source: WeChat public account [Petroleum News]

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In April this year, the oilfield established a polymer flooding innovation research team to explore polymer flooding technology for chemical flooding Class III reservoirs.

Under the leadership of Gong Xianfeng, chief oilfield expert and head of the innovation team, , the team has strengthened geological engineering integration research. Scientific researchers at the Exploration and Development Research Institute started with fine research on oil reservoirs, deepened the understanding of sedimentary microphases and research on remaining oil, clarified the oil displacement mechanism of polymer flooding, and further clarified the role of polymer flooding in development. At the same time, they have been conducting research on injection and production well patterns, well spacing, injection timing and other aspects for two sets of strata for six consecutive months, compiled an overall polymer flooding plan for 16 blocks, and expanded the deployed application well group from the current 3 injections and 4 productions to 8 injections and 13 productions.

Research staff of the Petroleum Engineering Technology Research Institute repeatedly investigated and tackled the problems existing in the application, upgraded the injection process, independently designed and built a skid-mounted differentiated low-shear polymer flooding process, and successfully realized the personalized injection needs of three well groups. "The three well groups have different injection concentration requirements due to differences in permeability and inter-layer differences." Ni Haitao, a technician at the Institute of Ground Studies of the Academy of Engineering, said, "Based on the first-stage polymer flooding injection process, we changed the solution preparation method and upgraded the solution concentration from a single concentration to a concentration that meets the arbitrary preparation needs of multiple well groups. This process can use both clean water preparation and sewage preparation, completing the expanded scale application of polymer flooding ahead of schedule. "

At the same time, with the demand for high-quality development of oil fields, starting from June, in order to further clarify the seepage mechanism of polymer flooding, understand the viscosity changes at each node during the injection process, and improve the effect of polymer flooding, the innovation team also conducted a two-month in-depth physical model study on the feasibility and promotion potential of the technology. The innovative team analyzed the factors affecting the viscosity of the polymer solution from aspects such as perforation characteristics, and produced a viscosity loss risk identification and countermeasures chart, laying a theoretical foundation for the promotion and application of this technology and the development of improved polymer flooding benefits.

Faced with the difficulty of improving efficiency in the old Dongpu District, the polymer flooding team first carried out a pilot test of polymer flooding 3 injection 4 mining in the Ming 16 block. So far, 0.12 times the pore volume of the polymer solution has been injected into this block, reaching 24% of the designed volume. The initial effect is seen, the injection pressure has increased by 3 to 5 MPa, and the oil increase has exceeded the prediction of the reservoir plan. It is a gratifying step to explore the application of polymer flooding technology in oil fields.

"Our polymer flooding innovation research team will continue to work hard and strive to gradually cover the chemical flooding temperature of 80 degrees Celsius and mineralization 10 in 3 to 5 years. With reservoir conditions below 10,000 milligrams per liter, we have explored a cost-effective tertiary oil recovery technology suitable for high-temperature and high-salt reservoirs. With the gradual increase in injection volume, we believe that by the end of the pilot test period, polymer flooding technology will definitely contribute to the profitable development of the Dongpu old area," said Xu Haimin, an oilfield expert.

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