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< Natural Gas and Oil > Editorial Department
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Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2011 Vol.6

    Analysis on Sensitivity of Fuyu Oil Reservoir in Daqing Sanzhao Area
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    Key Words：Reservoir； Sensitivity evaluation； flow test； Fuyu reservoir
    Abstract：Fuyu reservoir in Daqing Sanzhao area， with an average air permeability of 1. 210-3μm2， is one of extremely low permeability reservoirs developed difficultly， which contains such sensitive clay minerals as illite， chlorite， mixed layer of smectite and illite and mixed layer of smectite and chlorite. It is necessary to acquaint oneself with sensitivity of various clay minerals in the reservoir in order to select proper production methods and optimize operating fluid formula. Adopted was laboratory analysis method to carry out a large number of sensitivity experiment researches on Fuyu reservoir of Sanzhao area and research results show that Fuyu reservoir is of medium velocity flow sensitivity， strong medium salt sensitivity， weak acid sensitivity， weak alkali sensitivity and stress sensitivity. Its critical flow velocity of 0. 007 388 m3/d and critical salinity of 4×104mg/L show that extrinsic fluid velocity shall be controlled and proper clay stabilizing agent shall be added in order to decrease damage on the reservoir. The critical pH of 9 shows that pH value of the operating fluid shall be controlled properly in order to prevent secondary pollution. The average of maxium permeability loss factor of 14. 75 % and 9. 20 % respectively in core pressurization and depressurization process shows that production pressure differential， production rate and depressurization method shall be adjusted properly according to stress sensitivity in this reservoir， which provides the basis for future operating fluid formula optimization in this area.
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