RU2008135478A - METHOD FOR GAS-ACID INTENSIFICATION OF OIL FLUID FROM RESERVOIR AND EXPLOSIVE OIL WELLS - Google Patents

Abstract

1. The method of gas-acid intensification of oil flow from the reservoir of producing and injection oil wells, including the injection of a chemical reagent through a well into a zone of a productive formation, technological exposure, removal of the spent chemical solution, characterized in that when the annular valve is open into the volume of the tubing wells feed an acidic foaming composition in a circulation mode, calculated at 0.3-2.5 m3 per meter of perforated reservoir power, then after 20-60 s the flow of gaseous neutron pressurized gas ceiling elements 100-650 kgf / cm2 and the output of feed neutral gas 100-1200 m3 / h, the starting pressure of the neutral gas pre-calculated according to the formula: ! where h is the immersion depth of the pipes under the static level, m,! p - fluid density, t / m3,! g - acceleration of gravity, m / s2,! D is the inner diameter of the production string, mm,! d is the inner diameter of the lifting pipes, mm,! the distance from the wellhead to the installation site of the first valve is calculated by the formula: !! where L is the distance from the wellhead to the installation location of the first valve, m,! h article - the distance from the wellhead to the static level, m,! Pmax - maximum pressure of a neutral gas, MPa,! ρ is the fluid density, t / m3,! the maximum neutral gas pressure is calculated taking into account the installation depth of the start valve according to the formula:! ! where Рmax is the maximum pressure of a neutral gas, MPa,! ρ is the fluid density, t / m3,! g is the acceleration of gravity, m \ sec2,! D is the inner diameter of the production string, mm,! d is the inner diameter of the lifting pipes, mm,! L is the distance from the wellhead to the installation site first

Claims (5)

1. The method of gas-acid intensification of oil flow from the reservoir of producing and injection oil wells, including the injection of a chemical reagent through a well into a zone of a productive formation, technological exposure, removal of the spent chemical solution, characterized in that when the annular valve is open into the volume of the tubing wells feed an acidic foam-forming composition in the circulation mode at a rate of 0.3-2.5 m ³ per meter of perforated reservoir power, then after 20-60 s the flow of gaseous neutron gas at a pressure of 100-650 kgf / cm ² and a flow rate of neutral gas of 100-1200 m ³ / h, and the starting pressure of the neutral gas is previously calculated by the formula:

where h is the immersion depth of the pipes under the static level, m, p is the density of the liquid, t / m ³ , g - acceleration of gravity, m / s ² , D is the inner diameter of the production string, mm, d is the inner diameter of the lifting pipes, mm, the distance from the wellhead to the installation site of the first valve is calculated by the formula:

where L is the distance from the wellhead to the installation location of the first valve, m, h article - the distance from the wellhead to the static level, m, Pmax - maximum pressure of a neutral gas, MPa, ρ is the density of the liquid, t / m ³ , the maximum neutral gas pressure is calculated taking into account the installation depth of the start valve according to the formula:

where Рmax is the maximum pressure of a neutral gas, MPa, ρ is the density of the liquid, t / m ³ , g is the acceleration of gravity, m \ sec ² , D is the inner diameter of the production string, mm, d is the inner diameter of the lifting pipes, mm, L is the distance from the wellhead to the installation location of the first valve, m, hst is the distance from the wellhead to the static level, m, moreover, if the maximum permissible pressure value of the gaseous neutral gas supply unit is reached or the maximum permissible pressure value of the operating column is reached, the gas injection is stopped for a short time and the acid foam composition is continued to be pumped, then after the acid foam composition is pumped into the volume of the well tubing, the valve is closed or packer is planted, the remaining acidic foam-forming composition is pumped, squeezed into the formation called foam acid with technical water or oil in a volume in m ³ equal to the sum of the internal volume of the tubing of the well and the volume of the production string from the shoe of the tubing of the well to the lower perforation holes, and close the injection line, gradually reduce the pressure in the borehole space, remove the acid-foaming reaction products, drain the formation and develop the well through the annulus by selling the gas rim with oil or technical water with surface active substance in a volume equal to the volume of the annulus of the well. 2. The method according to claim 1, comprising using nitrogen, helium or argon as a neutral gas pumped into the volume of the tubing of the well. 3. The method according to claim 1, characterized in that when performing work on terrigenous strata, an acidic foam-forming composition containing 10-25 wt.% Hydrochloric acid, 2-5 wt.% Hydrofluoric (fluoride hydrogen) acid, surfactants in a volume of 40 l / m ³ , the rest is water. 4. The method according to claim 1, characterized in that when performing work on carbonate formations, an acidic foaming composition containing 10-25 wt.% Hydrochloric acid, surfactants in a volume of 40 l / m is supplied into the volume of the tubing of the well. ³ , the rest is water. 5. The method according to claim 1, characterized in that when performing work on supplying into the volume of the tubing of the well an acid foaming composition, the aeration coefficient (m ³ gas / m ³ acid foaming composition) is at least 50.