DEVICE FOR WELL TREATMENT Russian patent published in 2000 - IPC

FIELD: devices for operation of oil, gas, water and technological wells. SUBSTANCE: device has hollow body in the form of pipe string with inlet valve. Hollow body is lowered into well on logging cable. Inlet valve is made in the form of working cylinder with through windows sealed from external pressure by outer symmetrical holder with rubber packings. Rigidly secured in holder walls is pin passed through windows of working cylinder. Holder is spring-loaded and held closed position of windows by flexible link secured to pin sheared with the help of dropped striker. Symmetry of holder ends allows mutual equalization of fluid pressure force in well exerted on holder and working cylinder and due to it reduction of force required for valve opening. Force required for valve opening is reduced and does not depend on area of inlet cross-section and hydrostatic pressure in well. EFFECT: higher efficiency of device operation. 2 dwg