METHOD OF WELL PRODUCTIVITY IMPROVEMENT (VERSIONS) Russian patent published in 2008 - IPC E21B43/26 

FIELD: mining engineering, oil industry.

SUBSTANCE: invention refers to stimulation techniques. It ensures increase of method effectiveness at the cost of prevention crack closure in well critical area and provides reliable connection of fracturing pattern with wellbore both for formations with cracks resulted from hydroseparation and for formations with natural cracks. Method includes well pumping with material expanded in process of hardening or setting. This material is pumped into well critical area equipped with well casings in between well casing and formation with natural cracks or cracks caused by hydroseparation. After that well is being perforated. As a material expanded in process of hardening or setting is used that one having degree of extension high enough to make pressure on well sides and keep at least one crack open.

EFFECT: increase of effectiveness of oil production at the cost of prevention crack closure in well critical area and reliable connection of fracturing pattern with wellbore.

7 cl