METHOD AND DEVICE FOR STIMULATING OIL AND GAS WELLS OPERATION (VERSIONS) Russian patent published in 2009 - IPC E21B43/18 

FIELD: mining.

SUBSTANCE: according to one of versions device includes geo-physical cable for device lowering and consists of apparatus head, trigger mechanism, depression assembly in form of two and more receiving valve filters connected between them with depression chambers with atmospheric pressure, and manometer block. According to the invention there are implemented the receiving valve filters of pneumatic-hydro-equalised design with pass through channels from 10 to 50 mm diameter and a common pneumatic hydro-channel of depression chambers. Each of the chambers with length of from 1.5 to 3 and more m facilitates automatic opening of all valve filters and creating a depression zone in well regulated in length by number of the receiving filters and depression chambers, where depression value is within limits (0.1-0.9) of hydro-static pressure with duration of depression action 0.6-1.2 sec and more at controlled coefficient of influence on the bed - Cib assessed by ratio of whole area of pass-through channels of receiving valve filters to area of gap between the depression device and well with values of up to 1.0 and more. Also the lower depression chamber is used as a container for collecting and lifting of mud extracted from bed to the surface. As a trigger mechanism an electro-hydraulic trigger mechanism is used; when hydrostatic pressure opens it, the upper receiving valve filter opens, with automatic successive opening all receiving filters assembled below. Other versions of the device are modifications of a disclosed version. Versions of the method consist in various versions of device implementation.

EFFECT: increased efficiency of method and increased reliability of device due to regulation of depression zone.

6 cl, 6 dwg, 6 app