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Matching of asphalt particles and formation pores for conformance control treatment in Lamadian Oilfield of Daqing
LI Yiqiang1,2, XIANG Gang3, WANG Yansheng1, LI Yanyue4, LI Junjian5
(1.Enhanced Oil Recovery Institute in China University of Petroleum, Beijing 102249, China;2.Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 102249, China;3.The 10th Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang 745100,China;4.Bohai Oilfield Research Institute of China National Offshore Oilfield Corporation Limited-Tianjin, Tianjin 300452, China;5.Ministry of Education Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249,China)
Abstract:
The Lamadian block in Daqing Oilfield has been water flooded, and it is now at a high water cut stage with serious water channeling and ineffective water circulation. It is necessary to take channel blocking and conformance control measures. Asphalt particles can be used to plug water channeling in high permeability zones in order to increase sweeping volume for improved oil recovery. In field applications, high injection pressure can be induced if the sizes of asphalt particles are not matched with formation pores in the reservoir. Experimental study was conducted using specially designed cement cores, based on similarity criteria to simulate the flow conditions in wellbore, to investigate the blocking effect of asphalt particles. The resistance coefficient, residual resistance factor and plugging rate were measured and analyzed to assess the matching between asphalt particles and the pores of the simulated cores, and the influence of particle concentration was also studied. The experimental results show that the cores with permeability 2 μm2 can be matched with the asphalt particle size of 0.1-0.3 mm. Undersized or oversized particles can reduce the conformance control effect, and the concentration of asphalt particles in the injectant can limit their migration ability. When the particle concentration is increased to 5 g/L, accumulations of asphalt particles can be caused in the formation, in which a scheme with asphalt particles alternative water injection is proposed to avoid the accumulation.
Key words:  Daqing Oilfield  asphalt particles  conformance control  high permeability zone