METHOD OF WELLS FINDING FOR SIDE TRACKING ON MATURE WATER CUT DEPOSITS Russian patent published in 2008 - IPC E21B43/16 

FIELD: oil-gas area.

SUBSTANCE: one chooses all perspective wells in the deposit, in which drainage zones it can be found unrecovered oil. They are predicted by suddenly grew water cut in exploitation wells and in areas of raised contrast in shale-collector between its maximal and minimal penetrating in vertical and horizontal directions, when derivative relation water-oil take on value, more than unit. Then one analyses water cut, relation water-oil, oil recovery factor while water flooding. According to analyses results - oil recovery destruction to finite index of its extraction one defines concentration places of unrecovered oil, their quantity and location. Dimensions of unrecovered oil are taken inversely related to achieved index. According to production decline curve analysis in all wells in concentration places of unrecovered oil and around them one gets dynamic reservoir factors in concentration places of unrecovered oil - deformation index of collector properties of shale-collector and its penetration. This is checked on geological model. One predicts projected uplift of new stem dipping and chooses well, in which new stem dipping will be bored.

EFFECT: extraction increasing and final oil recovery.

5 dwg