Published August 2012

Liquidation of complications occurred resulting hydraulic rupture

J.S. Akhundov

The structure of rocks is characterized by structure and a texture, which significantly influence indicators of formation properties. It is practically impossible to study all properties of layers before descent casing strings and flow strings. Therefore in order to avoid hydraulic fracturing it is necessary to reduce hydrodynamic pressure at column descent. Because of technical characteristics of drilling units it is practically not probable to reduce column descent speed below 0,2 km/s to decrease hydrodynamic pressure. Consequently, at descent casing strings and flow strings there is a danger of hydraulic fracturing of a layer which is the major reason of complications in drilling and often liquidation of the specified complications leads to serious failures. The principal reason of hydraulic fracturing in well borehole is the hydrodynamic pressure intensive increase connected with increase of inserted string depth and with increase of relation coefficient of the inserted into the well string radius rа. The operational experience of the inserted string in Muradkhanly and Djafarly areas has shown that at rа0.6 hydraulic fracturing does not occur and at rа0.75 it is unavoidable. While occurrence of hydraulic fracturing after making necessary decisions the landing of string to design depth proceeds and there is a column pouring. On application of specified method it is possible to avoid failure and technical liquidation of wells.