Abstract
Large gas and gas-condensate fields of Russia are getting depleted and gradually coming to the closing stage of development and that means that an increased number of “drowned” and “self-killed” gas wells appear. The urgency of this problem is approved by the gas-recovery ratio of such unique gas fields of Russia as Urengoyskoye, Medvezhye and Yamburgskoye. A significant share of gas is produced there and current gas recovery factor of the Cenomanian reservoir is about 80%. Insufficient flow velocity of the gas-liquid mixture in production casing and tubing is the reason of liquid accumulation. One of the most efficient methods of solving this problem is pumping foaming compositions downhole. Nowadays both liquid foaming solutions and solid foaming agents have been used to solve this problem. Many foaming compositions have been tested at unique West-Siberian gas fields. Before applying surfactants at production fields, laboratory research should be performed to assess their efficiency and influence on the processes of foam formation and liquid removal from the wellbore. This research is often performed under dynamic conditions using an installation simulating processes taking place in a gas well. The results of the laboratory research of different surfactants’ influence on the processes of foam formation and liquid removal from Cenomanian gas wells are presented in this article and can be used by gas-producing companies.
Published Version
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