Technique for maximizing effectiveness of fracturing in massive intervals

A method for maximizing the effectiveness of fracturing in a formation containing laminated massive productive intervals comprising:

• a) drilling a wellbore into said formation which wellbore has an opening to the surface and contains a first and a second spaced apart vertical sections that communicate with at least one substantially horizontal section;
• b) perforating the second vertical section which is furthermost from said opening and deeper in the formation than the first vertical section thereby causing it to be in fluid communication with a first laminated productive interval of said formation;
• c) conducting a hydraulic fracturing operation through perforations in said second vertical section thereby creating a hydraulic fracture in said first laminated productive interval which is located deepest in said formation;
• d) directing a solidifiable liquid mixture into said second vertical section where it remains for a time sufficient to form a solid within said fracture and perforated vertical section;
• e) perforating the first vertical section of said wellbore that is located in a second laminated productive interval above said first interval;
• f) fracturing hydraulically into said second interval through perforations in said first section thereby creating a fracture in said second interval which fluidly communicates with the second perforated interval;
• and
• g) causing the solid in step d) to liquidfy thereby establishing fluid communication with the wellbore via the first and second laminated productive intervals.