METHOD FOR PRESERVING COLLECTOR PROPERTIES OF WELL ADJACENT PORTION OF PRODUCTIVE LAYER Russian patent published in 2004 - IPC

FIELD: oil extraction industry. SUBSTANCE: method includes placement of working fluid with sodium naphthenate addition opposite to productive layer. Working fluid is stored in pores and/or cracks of productive layer in radius of 0.3-2.0 meters from well shaft. Then working fluid is pressed into productive layer in mode of layer impregnation at its whole width. For said procedure pressure of opening of natural vertical cracks of productive layer is set. Layer impregnation is performed at a pressure being less than pressure of opening natural vertical cracks for 5-15% of set pressure, in cyclical mode of pressure increase/decrease. After that layer is treated as planned. EFFECT: increased method effectiveness due to possibility of preserving collector properties of productive layer at its whole thickness and at a distance from well into layer depth of no less than area of sedimentations. 6 cl