Geology, geography and global energy

Scientific and Technical Journal

Hydrogeological mechanism of waterflooding gas-condensate fields

2016. №1, pp. 14-19

Serebryakov O.I. - D. Sc. in Geology and Mineralogy, Professor, Astrakhan State University, 1 Shaumyan sq., Astrakhan, 414000, Russian Federation, geologi2007@yandex.ru

There is a gradual formation of a water mode of the productive deposit in the process of developing gas and gas-condensate fields. Peculiarities of manifestation of water-pressure regime development of the Astrakhan gas-condensate field are the result of the following geological and hydrogeological settings. The productive horizon controlling a gas-condensate deposit is limited: height of the gas-condensate deposit makes 200 m at the area of gas-water contact about 2 thousand km and the sizes of a deposit 110 x 40 km. At the same time the spreading water-bearing pool controlling a deposit is almost boundless. In such mountain and hydrogeological conditions characteristic time of development of a deposit is significantly more than characteristic time of distribution of the indignant pressure drop from a deposit to borders of her water-bearing system (GWC). Fishing gas and hydrodynamic researches on the exploration of the Astrakhan gas-condensate field have allowed taking the pressure in the water-bearing system surrounding the deposit, equal to the initial pressure in the deposit and substantiating the initial energetic and statistical mode as elastic gas. However, in the process of developing a natural system of the Astrakhan gas-condensate field В«deposit - waterВ» pressure drop became considerable to advance pressure decrease in a deposit in the spreading water-bearing pool. It is leading to a gradual increase in the amount of water (water-and-gas factor) in the produced gas.

Key words: геотехнология, газ, конденсат, давление, компоненты, динамика, geotechnology, gas, condensate, pressure, components, dynamics

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