Water Lock Effect Mechanism of Tight Sandstone Gas Reservoir: An Example of the He 8 Reservoir of the Upper Paleozoic in the Southeast Region of Sulige Gasfield

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  • 1.State Key Laboratory of Continental Dynamics,Northwest University,Xi′an 710069,China;
    2.Department of Geology,Northwest University,Xi′an 710069,China;3.Research Institute of
    Drilling and Production technology of Qinghai Oilfield Branch of PetroChina,Dunhuang 736202,China;
    4.Research Institute of Exploration and Development of Changqing Oilfield Branch,PetroChina,Xi′an 710018,China;
    5.CCDC Engineering Technology Research Institute,PetroChina,Xi′an  710018,China

Received date: 2014-11-30

  Revised date: 2015-05-11

  Online published: 2015-10-10

Abstract

Water lock effect is an important factor affecting the production of gas well mining.In the tight sandstone gas reservoirs with low and ultra-low permeability,due to small pore and throat,effect of water lock is more obvious than that in other gas reservoirs.This paper has discussed the mechanism of the water lock effect in tight sandstone gas reservoir during the process of production by analyzing the stress characteristics of liquid phase in reservoir sandstone before and after development.Ascertained the relationships between pressure and water saturation,pressure and gas phase relative permeability by the analytical data of high pressure mercury and gas water relative permeability experiments.The results showed that,the pressure has good exponential relationship with water saturation,while the pressure and the relative permeability of the gas phase showed a significant logarithmic relationship.With the increase of production pressure difference,it will lead to the increase of water saturation.The increased water saturation will result in decrease of the gas phase percolation capacity.The result aggravated the water locking damage degree ultimately.Reasonable production pressure has great significance for reducing the water lock effect of gas well and delaying the water breakthrough time.

Cite this article

SHENG Jun,SUN Wei,DUAN Bao-hong,LIU Yan-ni,ZHANG Tao,CAO Lei . Water Lock Effect Mechanism of Tight Sandstone Gas Reservoir: An Example of the He 8 Reservoir of the Upper Paleozoic in the Southeast Region of Sulige Gasfield[J]. Natural Gas Geoscience, 2015 , 26(10) : 1972 -1978 . DOI: 10.11764/j.issn.1672-1926.2015.10.1972

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