The features of well operation under flooding conditions are considered. Methods for introducing foaming surface-active substances (surfactants) into the well, incl. solid surfactants to intensify the removal of liquid from the bottomhole to the surface. The area of application of solid surfactants in flooded wells is substantiated. When introducing solid surfactants into an operating flooded well, their rate of fall in tubing (tubing) must exceed the velocity of the gas-liquid flow at the wellhead, and the gas flow rate must be greater than the minimum required flow rate to carry fluid from the bottomhole. Dependences for determining the gas velocity at the wellhead and at the input to the tubing, the critical gas velocity at the wellhead for the removal of solid phase particles, the critical gas velocity at the inlet to the tubing for the removal of liquid in a droplet form, and the minimum required gas flow rate for the removal of liquid from wells. Taking into account the above dependencies, as well as the two-term formula for gas inflow to the bottom of the well and the formula of G. A. Adamov for the movement of a two-phase gas-liquid flow in the tubing, a method has been developed for choosing the technological mode of operation of a watered gas well when solid surfactants are introduced into the tubing. The technique was tested on three wells with different geological and technical characteristics, located in different fields of Ukraine. According to the results of studies on two wells, it is not necessary to change the technological mode of their operation when solid surfactants are introduced into the tubing. On one well, it is necessary to increase the wellhead pressure by a certain amount in order to reduce the velocity of gas movement at the wellhead and solid surfactants get to the bottomhole. The operating parameters of wells are given when solid surfactants are injected into the tubing
Received 25.05.2022
Revised 21.10.2022
Accepted 28.11.2022
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