METHOD FOR TREATING BOTTOM-HOLE ZONE OF BED Russian patent published in 1999 - IPC

FIELD: oil and gas production industry. SUBSTANCE: method is used in completing and cleaning of wells. At first stage of treating cycle, bottom-hole pressure is raised. In this case, pressure level is limited by value of bed hydraulic fracturing pressure. Bottom-hole pressure is maintained during period of time required for obtaining piezometric curve which is monitored according to stabilization of flow rate. After repressuring, bottom-hole pressure is quickly reduced below bed pressure level. This is achieved by opening of annular space and actuation of jet pump. At bottom-hole pressure lowered below bed pressure level, undertaken is vibration-wave treatment by means of hydrodynamic generator with vibration displacement of oil reservoir to more than 0.1 of average diameter of pore passages and vibration acceleration higher than 0.1 of free fall acceleration. As bottom-hole zone is being cleaned, transmission of pressure pulsing deeper in bed is increased. Despite gradual reduction of depressuring value, simultaneously increasing is radius of zone subjected to depressuring and radius of treatment as well. Method is recommended for use in completing and cleaning of wells especially of wells which are operated in difficult conditions of development, and also of inclined and inclined-horizontal wells. Aforesaid method is characterized by high efficiency of cleaning wells operated in complicated conditions of developing oil deposits and also by possibility of efficient treating inclined and inclined-horizontal wells. EFFECT: higher efficiency. 5 cl, 2 dwg