PROCESSING OF BOTTOMHOLE OF LOW-CEMENTED TERRIGENOUS BED AT ABNORMALLY LOW BED PRESSURE Russian patent published in 2014 - IPC E21B43/27 C09K8/74 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises lowering of flexible pipe into gas well production tubing to well bottom and its cleaning of water and impurities by service water treated with surfactant and water-repellent and thickened by two-percent solution of carboxymethyl cellulose. Then, flexible pipe is lifted to lower holes of perforation interval. Then, acid solution is injected in said pipe into perforation interval at slow lifting of said pipe at the rate of 2 m/s. Said acid solution contains the following components in wt %: citric acid 10-20; non-ionic surfactant "ОП"-10 1-2; Trilon "Б" 0.2-0.5; water making the rest, in the volume of 0.2-0.5 m³ of effective perforated depth. Buffer gas or inert gas is used to force acid solution in the bed. Flexible pipe is, then, lifted to keep the well for axis solution reaction with mid compounds.

EFFECT: recovery of gas hydrodynamic communication of well with low-cemented terrigenous productive bed at abnormally low bed pressure.

1 dwg, 3 ex