Variation Rules of Driving Energy of Deep Aqueous Carbonate Gas Reservoirs in Moxi Block of Anyue Gas Field

doi:10.3969/j.issn.1006-6535.2021.02.012

Abstract

Abstract: Deep aqueous carbonate gas reservoirs are developed with pores and fractures. The strong compressibility of rocks and the complex gas-water relationship affect the variation of driving energy in the gas reservoirs, leading to the great difference in dynamic analysis and development mode optimization of gas reservoirs. In response to this problem, taking the Longwangmiao gas reservoir in the Moxi block of the Anyue Gasfield as an example, the variation rules of the compressibility of deep carbonate rocks were studied through experiments, and the equations were established for the compressibility sensitivity to stress of different types of reservoirs. Combined with the material balance equation of water drive gas reservoirs, the pressure drop indicator curve was employed to study the influence of the compressibility of different types of reservoir on the driving energy variation of variable-volume confined gas reservoirs, and the influence of different water saturations of the connate water area and gas-water transition zone on the driving energy variation of variable-volume confined gas reservoirs, and the influence of compressibility on the driving energy of water drive gas reservoirs. Taking Well 009-3-X2 as an example, the driving indicator in different periods was calculated and its variation rules were analyzed. The results of the study showed that there was quite difference in the compressibility of different types of carbonate reservoirs, the compressibility of fracture-cavity reservoirs was sensitive to stress, the elastic energy of rocks and pore water wars strong in the early stage of development, the elastic driving indicator was 0.317 to 0.535, and the elastic energy was mainly released when the recovery percent was less than 20%; when the water saturation of the reservoir reached 60%, the elastic driving indicator of free water in the formation reached 0.359; when there was edge-bottom water, the driving energy of the edge-bottom water pressure was higher in the initial stage, and gradually weakened later. The study results provide significant basis for the optimization of carbonate gas reservoir development modes, productivity evaluation and reserves calculation.

Key words: carbonate rock, driving energy, compressibility, driving indicator, aqueous gas reservoir, Anyue Gasfield

CLC Number:

TE344

Ruan Jifu, Pang Jin, Yuan Quan, Yi Jin, Ou Jiaqiang. Variation Rules of Driving Energy of Deep Aqueous Carbonate Gas Reservoirs in Moxi Block of Anyue Gas Field[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 83-88.

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