System and method for performing downhole stimulation operations
A system and method for performing stimulation operations at a wellsite having a subterranean formation with of a reservoir therein is provided. The method involves generating a plurality of quality indicators from a plurality of logs, and combining the plurality of quality indicators to form a composite quality indicator. The plurality of stress blocks may then be merged using diversion criterion. The composite quality indicator may be combined with the merged stress blocks to form a combined stress and composite quality indicator, the combined stress and composite quality indicator comprising a plurality of blocks with boundaries therebetween. The method may further comprise defining stages along the combined stress and composite quality indicator based on the diverter-assisted stage classifications; and selectively positioning perforations in select stages based on the diverter-assisted stage classifications thereon.
1. A method for staging a stimulation operation for a wellsite having a reservoir positioned in a subterranean formation, comprising:
generating from measured wellsite data a plurality of quality indicators from a plurality of logs;
using modeling techniques to combine the plurality of quality indicators to form a composite quality indicator;
merging a plurality of stress blocks using diversion criterion;
using modeling techniques to combine the composite quality indicator with the merged stress blocks to form a combined stress block and composite quality indicator, the combined stress block and composite quality indicator comprising a plurality of blocks with boundaries therebetween;
defining stages along the combined stress and composite quality indicator based on diverter-assisted stage classifications; and
perforating a wellbore at select stages based on the diverter-assisted stage classifications thereon.
2. The method of claim 1 , wherein the generating comprises measuring downhole parameters with a downhole tool positioned in a wellbore at the wellsite.
3. The method of claim 1 , wherein the generating comprises generating a reservoir quality indicator by combining a plurality of reservoir logs and generating a completions quality indicator by combining a plurality of completions logs.
4. The method of claim 3 , wherein the plurality of reservoir logs and the plurality of completions logs comprise a plurality of resistivity logs, permittivity logs, productions logs and combinations thereof.
5. The method of claim 1 , wherein the diverter-assisted stage classifications comprise one of good, bad and combinations thereof.
6. The method of claim 1 , further comprising selectively adjusting the stage boundaries.
7. The method of claim 6 , wherein the selectively adjusting comprises selectively eliminating the plurality of blocks that are less than a minimum diverter-assisted stage length.
8. The method of claim 6 , wherein the selectively adjusting comprises splitting the plurality of blocks having a length greater than a minimum diverter assisted stage length.
9. The method of claim 6 , wherein the selectively adjusting comprises selectively shifting boundaries based on the diverter assisted classifications.
10. The method of claim 1 , wherein the merging further comprises:
creating a plurality of stress blocks;
computing fracture initiation pressure using one or more of well properties, near-wellbore properties and the plurality of stress logs; and
merging fracture initiation blocks using the diversion criterion.
11. The method of claim 10 , wherein the merged stress blocks are the merged fracture initiation blocks.
12. The method of claim 1 , wherein the perforating further comprises selecting positioning the perforations to impart a direction to the fracturing sequence.
13. The method of claim 1 , wherein the perforating further comprises selectively positioning the perforations to fracture stress shadowed regions of the formation.