Pressure Variation Characteristics in Bead-shaped Fractured Vuggy Carbonate Gas Reservoirs

doi:10.11885/j.issn.1674-5086.2015.03.05.05

Abstract

Abstract: This paper establishes a mathematical model for gas flow through bead-shaped fractured vuggy carbonate gas reservoirs based on material balance and fracture flow equations. This model could calculate the pressure variation in each vug during the gas production stage. A series of numerical calculations were conducted on the mathematical model, and then a double logarithmic curve of the bottom hole pressure(BHP) and a semi-logarithmic curve of pressure derivative were plotted. According to the semi-logarithmic curve, pressure derivative curves of vugs initially increase and then decrease; meanwhile, the derivative curves of the nearest vug from the well increases and decreases most rapidly, and its turning point presents earlier than other vugs. The double logarithmic curve could be divided into four stages-wellbore storage effect reaction stage, fracture reaction stage, vug reaction stage, and boundary reaction stage. Finally, we studied the characteristics of the double logarithmic curve from a series of models with different number/volume/arrangement of vugs and different apertures/arrangements of fractures, and it was found that the characteristics of double logarithmic curves change with the different above-mentioned parameters.

Key words: bead shaped fractured vuggy carbonate, mathematic model, reservoir pressure variation, well test analysis, fracture flow

CLC Number:

TE341

WANG Hai, LIN Ran, ZHANG Chenyang, HUANG Binguang, MIU Changsheng. Pressure Variation Characteristics in Bead-shaped Fractured Vuggy Carbonate Gas Reservoirs[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 124-132.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.03.05.05

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