Considering high temperature and high salinity in the reservoirs, a dispersed particle gel soft heterogeneous compound (SHC) flooding system was prepared to improve the micro-profile control and displacement efficiency. The characteristics and displacement mechanisms of the system were investigated via core flow tests and visual simulation experiments. The SHC flooding system composed of DPG particles and surfactants was suitable for the reservoirs with the temperature of 80-110 ℃ and the salinity of 1×104-10×104 mg/L. The system presented good characteristics: low viscosity, weak negatively charged, temperature and salinity resistance, particles aggregation capacity, wettability alteration on oil wet surface, wettability weaken on water wet surface, and interfacial tension (IFT) still less than 1×10-1 mN/m after aging at high temperature. The SHC flooding system achieved the micro-profile control by entering formations deeply and the better performance was found in the formation with the higher permeability difference existing between the layers, which suggested that the flooding system was superior to the surfactants, DPG particles, and polymer/surfactant compound flooding systems. The system could effectively enhance the micro-profile control in porous media through four behaviors, including direct plugging, bridging, adsorption, and retention. Moreover, the surfactant in the system magnified the deep migration capability and oil displacement capacity of the SHC flooding system, and the impact was strengthened through the mechanisms of improved displacement capacity, synergistic emulsification, enhanced wettability alteration ability and coalescence of oil belts. The synergistic effect of the two components of SHC flooding system improved oil displacement efficiency and subsequently enhanced oil recovery.
ZHAO Guang
,
DAI Caili
,
YOU Qing
. Characteristics and displacement mechanisms of the dispersed particle gel soft heterogeneous compound flooding system[J]. Petroleum Exploration and Development, 2018
, 45(3)
: 464
-473
.
DOI: 10.11698/PED.2018.03.11
[1] 杜庆龙. 长期注水开发砂岩油田储层渗透率变化规律及微观机理[J]. 石油学报, 2016, 37(9): 1159-1164.
DU Qinglong.Variation law and microscopic mechanism of permeability in sandstone reservoir during long-term water flooding development[J]. Acta Petrolei Sinica, 2016, 37(9): 1159-1164.
[2] 高树生, 胡志明, 刘华勋, 等. 不同岩性储层的微观孔隙特征[J]. 石油学报, 2016, 37(2): 248-256.
GAO Shusheng, HU Zhiming, LIU Huaxun, et al.Microscopic pore characteristics of different lithological reservoirs[J]. Acta Petrolei Sinica, 2016, 37(2): 248-256.
[3] 王德民, 程杰成, 吴军政, 等. 聚合物驱油技术在大庆油田的应用[J]. 石油学报, 2005, 26(1): 74-78.
WANG Demin, CHENG Jiecheng, WU Junzheng, et al.Application of polymer flooding technology in Daqing Oilfield[J]. Acta Petrolei Sinca, 2005, 26(1): 74-78.
[4] 赵福麟. 采油用化学剂的研究进展[J]. 中国石油大学学报(自然科学版), 2007, 31(1): 163-172.
ZHAO Fulin.Research advances of chemicals for oil production[J]. Journal of China University of Petroleum (Edition of Natural Science), 2007, 31(1): 163-172.
[5] DUPAS A, HENAUT I, ROUSSEAU D.Impact of polymer mechanical degradation on shear and extensional viscosities: Toward better injectivity forecasts in polymer flooding operations[R]. SPE 164083, 2013.
[6] ZITHA P L J. Prediction of polymer viscosity reduction in pores using an exact depletion profile[R]. SPE 68981, 2001.
[7] MIDDLETON J, BURKS B, WELLS T, et al.The effect of ozone and high temperature on polymer degradation[J]. Polymer Degradation and Stability, 2013, 98(11): 2282-2290.
[8] SAMUELSON M L, CONSTIEN V G.Effects of high temperature on polymer degradation and cleanup[R]. SPE 36495, 1996.
[9] 赵光, 由庆, 谷成林, 等. 多尺度冻胶分散体的制备机理[J]. 石油学报, 2017, 38(7): 821-829.
ZHAO Guang, YOU Qing, GU Chenglin, et al.Preparation mechanism of multiscale dispersed particle gel[J]. Acta Petrolei Sinica, 2017, 38(7): 821-829.
[10] DAI Caili, ZHAO Guang, ZHAO Mingwei, et al.Preparation of dispersed particle gel (DPG) through a simple high speed shearing method[J]. Molecules, 2012, 17(12): 14484-14489.
[11] ZHAO Guang, DAI Caili, ZHAO Mingwei, et al.Investigation of preparation and mechanisms of a dispersed particle gel formed from a polymer gel at room temperature[J]. Plos One, 2013, 8(12): 1-9.
[12] DAI Caili, ZHAO Jianhui, YAN Lipeng, et al.Adsorption behaviors of cocamidopropyl betaine under conditions of high temperature and high salinity[J]. Journal of Applied Polymer Science, 2014, 131(12): 93-98.
[13] 刘卫东, 罗莉涛, 廖广志, 等. 聚合物-表面活性剂二元驱提高采收率机理实验[J]. 石油勘探与开发, 2017, 44(4): 600-607.
LIU Weidong, LUO Litao, LIAO Guangzhi, et al.Experimental study on the mechanism of enhancing oil recovery by polymer - surfactant binary flooding[J]. Petroleum Exploration and Development, 2017, 44(4): 600-607.
[14] 周亚洲, 王德民, 王志鹏, 等. 多孔介质中孔喉级别乳状液的形成条件及黏弹性[J]. 石油勘探与开发, 2017, 44(1): 110-116.
ZHOU Yazhou, WANG Demin, WANG Zhipeng, et al.The formation and viscoelasticity of pore-throat scale emulsion in porous media[J]. Petroleum Exploration and Development, 2017, 44(1): 110-116.
