FOAM REMOVAL OF LIQUID WITH APPLICATION OF ETHER SULFONATES OF ALCOHOLS Russian patent published in 2019 - IPC C11D1/29 C10G21/22 C09K8/584 C09K8/52 E21B43/16 

FIELD: soil or rock drilling; mining.

SUBSTANCE: in general, the present invention relates to compositions and methods for removing liquid containing crude oil or natural gas from wells, boreholes and pipelines during oil and gas production and transportation. Method of fluid removal from gas or oil well, well shaft or pipeline includes: introducing the composition into a gas well, an oil well, a well shaft or a pipeline in an amount effective for foaming fluid in the well, a borehole or a pipeline, for removing liquid from the well or pipeline; said liquid contains a hydrocarbon, water or a combination thereof, and said composition contains alcohol ether sulphonate of formula I, where: R₁ is a saturated monovalent hydrocarbon radical containing from one to twenty carbon atoms; R₂ is a saturated divalent hydrocarbon radical containing from one to twenty carbon atoms; R₃ and R₄, each independently represent ethylene or propylene; R₅ is hydroxyl, and R₆ is -SO₃M, or R₅ is -SO₃M, and R₆ is hydroxyl; M independently represents an alkali metal, an alkali-earth metal or hydronium; and a and b, each independently represent integer from 0 to 30, and a + b equals 1 to 60; and pumping gas into well, well shaft or pipeline.

EFFECT: technical result is providing excellent characteristics of pumping hydrocarbons, water or mixtures thereof from wells and transport pipelines.

20 cl, 2 tbl, 2 ex