METHOD FOR CLEANING FACE-ADJACENT BED AREA Russian patent published in 2005 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming of gas pillow by forcing gas into inter-tubular space. Further pushing liquid is forced therein with forcing away of liquid from inter-tubular space along tubing column into tank or store, pressure is dropped from inter-tubular space down to atmospheric and hydro-impact is used to effect well face by rotating liquid flow from tubing column. Pillow is formed by plant for forcing pushing liquid and gases. As gas, mixture of air and exhaust gases is used in relation no greater than 2:3. pillow pressure provides for prevention of gas from getting into tubing column. Volume of pushing liquid is determined from formula: V_pl=0.785^.(d21

-d22)^.(H_T-H_gp-H_i-t)^.10^-6, where d₁ - inner diameter of casing column, mm; d₂ - outer diameter of tubing pipes, mm; H_T - depth of lowering tubing column in well, m; H_gp - height of gas pillow in inter-tubular space, m; H_gp=K·P_gp; K - hydrostatic coefficient of resistance to pushing of liquid and gas (K=100 m/MPa), m/MPa; P_gp - end pressure of gas pillow, MPa; H_i-t - inter-tubular space height.

EFFECT: higher safety, higher efficiency.

3 cl, 2 dwg, 2 ex, 1 tbl