Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (4): 46-51.

• Petroleum Engineering • Previous Articles     Next Articles

Study on oil increasing effect and mechanism of comprehensive treatment measures after polymer flooding: Taking LD10-1 oilfield in Bohai Oilfield as an example

Liu Yigang1,Xiao Lihua1,Zou Jian1,Lu Xiangguo2,Yan Dong2,Cao Weijia2   

  1. 1.Bohai Oil Research Institute of Tianjin Branch, CNOOC, Tanggu, Tianjin 300452, China
    2. Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
  • Received:2017-08-14 Online:2018-08-26 Published:2018-11-28


LD10-1 oilfield in Bohai reservoir is a thick reservoir with high average permeability, serious heterogeneity, low cementing strength of rock and high single well injection-production strength. For this reason, during the development of the profile control and oil displacement technology of polymer gel in the early stages, the contradiction between and within layers caused by the polymer retention and scour are obvious. Then we test the development of the comprehensive treatment of the effect screening and performance evaluation, profile control, plug release of modifying and flooding agent, alternative injection of the profile control and oil displacement agent and water after polymer flooding. The results showed that, with the same dosage of the polymer gel, and compared with the whole slug injection method, the gel and water alternating injection method can slow down the speed of the entry profile reversal, and extend the sweep coefficient of the medium and low permeability layer. When they are used together, the utilization level of the medium and low permeability layers is further enhanced, and the effect of oil increasing and precipitation is obvious.

Key words: Bohai Oilfield, early polymer flooding, comprehensive treatment, physical simulation, mechanism study

CLC Number: 

  • TE357