METHODS OF INFLUX STIMULATION OUT OF BED BY MEANS OF REDUCING LEVEL OF WELL FLUID OF NEW AND REPAIRED OIL FLOWING WELLS WITH FOLLOWING MAINTAINING OF STATIC LEVEL Russian patent published in 2008 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to methods of influx stimulation of fluids out of a bed of producing oil, gas and gas condensate wells and can be used at development and stimulation of influx. This method provides reduction of bottom hole pressure and stimulation of bed fluid influx as well as upgraded efficiency of maintaining of constant gas effect onto a payout bed. The essence of the invention is as follows: the method consists in creating depression onto a bottom hole zone of the bed in a bored and cased well with the column of oil well tubing; the said depression is created by means of reduction of the level of well fluid with a gaseous medium, pumped into the annular space of the column of oil well tubing. As a working gas, neutral gas is pumped into the annular space of the column of oil well tubing of the well, the said annular space is filled with fluid. Neutral gas produces effect onto filling fluid of the annular space of the well under pressure of 150-600 kgm (kilogram-force)/cm² and with output of this gas supply of 10-1200m³/h with a following displacement of well fluid with neutral gas up to a bearing plate of lifting pipes and with reduction of gas fluid mixture density. Simultaneously the level of well fluid is raised up to a hole mouth and part of it is thrown off. At that priming pressure of neutral gas is reduced. Then, in the process of reducing well fluid level, pressure of working gas is steadily increased to the level of priming pressure, which is calculated on an analytic form. Maximum pressure of neutral gas is calculated with consideration of the depth of a kickoff valve installation. At that maximum priming pressure of neutral gas in a well exceeds working pressure of neutral gas pumping in the process of normal operation of well.

EFFECT: facilitates reducing of bottom hole pressure and stimulation of bed fluid influx at oil well development as well as increased efficiency of maintaining constant gas effect onto a payout bed.

3 cl, 1 ex