Search Result

Select

Mechanism and Oil Displacement of Heavy Oil Emulsification and Viscosity Reducer：A Case Study on Heavy Oil Reservoir and Fluid Conditions of Bohai Oilfield

Xu Guorui, Li Xiang, Xie Kun

Abstract （276）

PDF （2593KB）（58）

In order to further explore the mechanism of “increasing oil and decreasing viscosity” of heavy oil emulsification and viscosity reducer, experimental studies on oil displacement of heavy oil emulsification and viscosity reducer and its influencing factors have been carried out. Viscosity reducer was screened and related performance was evaluated.The viscosity and recovery efficiency were used as evaluation indexaccording to the geological characteristics and fluid properties in Bohai reservoir. The results showed that, the mechanism of decreasing viscosity of three kinds of viscosity reducer was forming oil in water emulsion, and the viscosity reduction effect of “viscosity reducer 2” was best among three kinds of viscosity reducer. Oil water emulsion gradually changed from oil in water (O/W) into water in oil(W/O) type and the viscosity was increased when the water content in emulsion decreased, eventually exceeding that of crude oil. Besides, with the heavy oil reservoir hetergeneity increasing, oil displacement of viscosity reducer got better. Oil displacement of viscosity reducer got worse with the increasing of curde oil viscosity, so the recovery amplification can be increased through preprocessing on viscosity reduction before similarty viscosity reducer was used.

2016, 29 (1): 57-62. DOI: 10.3969/j.issn.1006-396X.2016.01.011

Select

Research on the Optimization of the Polymeric Microsphereprofile Control Technology

Liu Fenggang, Tie Leilei, Li Xiang, Wang Guanhua

Abstract （590）

PDF （3857KB）（482）

Since polymeric microspheres have the ability of indepth profile control, nanopolymeric microspheres and coreshell macadam microspheres were chosen as the materials in the experiments. The slug injection, the order and ratio of the two different polymeric microspheres, and the ways of injection were systematically optimized. The experiment results show that compared with the highconcentration with shortslug and the lowconcentration with longslug, the midconcentration with midslug combined the above advantages, which can obtain a relatively more steady oil recovery ratio during a proper time. Utilization efficiency can be improved by injecting the coreshell macadam microspheres before injecting nanopolymeric microspheres during indepth profile control, and the best ratio is 1∶1 under the experiment conditions. The microspheres can be distributed more widely in the floor using interval injection, which is favorable for continued growth of oil recovery continually .

2015, 28 (5): 24-30. DOI: 10.3969/j.issn.1006-396X.2015.05.006

Select

The Influencing Factor for Foaming Behavior of an Anionic Foaming Agen

LI Xiang,LIU Wei,LI Song-yan,LI Zhao-min

Abstract （801）

PDF （334KB）（569）

The foaming behavior and its influence of an anionic sulphonate foaming agent(FA220) were researched.It was found that both of the foaming volume and half-time of foam reach the highest point when the concentration of foaming agent is 0.6%;FA220 has a good ability of resistance to Mg²⁺,NaCl and Ca²⁺bring some neglect impact on the stability of foam and very little impact on the foaming volume; the addition of polymer improves the foam system stability and decreases the foaming volume,the foaming volume and half-time of foam make better result when the concentration of polymer was between 0.3~0.8g/L;oil has obvious defoaming effect,the defoaming effect become stronger with the increase of oil saturation.

2011, 24 (4): 6-9. DOI: 10.3696/j.issn.1006-396X.2011.04.002