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Geoflodynamics and increase of condensate recovery at depletion

By: Contributor(s): Description: 10 pDDC classification:
  • CD I249 1 0013788
Summary: Transcripción del abstract original del autor: Development of gas and condensate fields under complicated geological conditions has specific features of geofluidynamical nature. In heterogeneous formations with a large volume of low porous reservoir (Tenguiz, the Astrakhan Gas and Condensate Field) a basic amount of connate water reserves are found in that portion of a reservoir where porosity is 0 - 0,06. Water saturation Sw of a low porous portion of a productive pay is the highest: 85-90%. This portion of a reservoir is low permeable and water is in a motionless state at the initial stage of deposit development due to low permeability of the reservoirs. As reservoir pressure declines in the process of deposit development under the conditions of depletion in high permeable stringers with high porosity, pressure will decline at higher rate than in low permeable stringers with low porosity. Pressure gradient (grad. P) appears between the stringers as well as filtration and fluid cross-flow from water saturated reservoirs with low porosity towards productive gas saturated reservoirs. Mechanism of water appearance and movement in the productive portion of the reservoir works slowly and the amount of "squeezed out" water increases gradually. In the recovered gas "squeezed out" water is not traced till the moment when water saturation will exceed a limit value of curr w S == 0,35. Condensate recovery of formation with intense deformation condition is provided by downsizing of pores of productive reservoir ßres and by formation fluid of productive reservoir expulsion by water when redistribution of water saturation between low and high porous reservoirs takes place.
Item type: Congresos (trabajos presentados)

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Transcripción del abstract original del autor: Development of gas and condensate fields under complicated geological conditions has specific features of geofluidynamical nature. In heterogeneous formations with a large volume of low porous reservoir (Tenguiz, the Astrakhan Gas and Condensate Field) a basic amount of connate water reserves are found in that portion of a reservoir where porosity is 0 - 0,06. Water saturation Sw of a low porous portion of a productive pay is the highest: 85-90%. This portion of a reservoir is low permeable and water is in a motionless state at the initial stage of deposit development due to low permeability of the reservoirs. As reservoir pressure declines in the process of deposit development under the conditions of depletion in high permeable stringers with high porosity, pressure will decline at higher rate than in low permeable stringers with low porosity. Pressure gradient (grad. P) appears between the stringers as well as filtration and fluid cross-flow from water saturated reservoirs with low porosity towards productive gas saturated reservoirs. Mechanism of water appearance and movement in the productive portion of the reservoir works slowly and the amount of "squeezed out" water increases gradually. In the recovered gas "squeezed out" water is not traced till the moment when water saturation will exceed a limit value of curr w S == 0,35. Condensate recovery of formation with intense deformation condition is provided by downsizing of pores of productive reservoir ßres and by formation fluid of productive reservoir expulsion by water when redistribution of water saturation between low and high porous reservoirs takes place.



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