Composition and method for non-mechanical intervention and remediation of wellbore damage and reservoir fractures
AssigneeKairos Energy Services Inc.
InventorsDeepak Patil, Ambrish Kamdar, Michael Lantz
Life of this patent
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Abstract
A method of non-mechanically remediating damage to a wellbore comprising a plurality of fracture stages is disclosed. A total treatment volume is calculated based on the plurality of fracture stages, the wellbore space, and either the production tubing or the annulus of the wellbore. The fracture stages of the wellbore are then divided into a plurality of chemical stages. The wellbore is pre-flushed, and each chemical stage is treated and isolated in order of depth by a volume of remediation chemical and volume of diverter. A post-treatment flush completes the remediation process and after a shut-in period, the well's production is substantially improved.
Claims20
A method of non-mechanically intervening to remediate damage to a wellbore, the wellbore comprising production tubing and a plurality of fracture stages and extending through a formation, the method comprising:
- (a) calculating a total treatment volume of a plurality of treatment fluids comprising one or more remedial chemicals selected for the damage;
- (b) determining, based on the plurality of fracture stages, a plurality of chemical stages, wherein each chemical stage of the plurality of chemical stages comprises a subset of fracture stages within the plurality of fracture stages;
- (c) selecting a chemical stage within the plurality of chemical stages;
- (d) calculating a volume of the selected chemical stage, wherein the volume of the selected chemical stage is a fracture pore volume of the subset of fracture stages, wherein the fracture pore volume is calculated from a proppant mass and a proppant pack porosity associated with the subset of fracture stages;
- (e) selecting, based on the subset of fracture stages, a chemical diverter;
- (f) determining a diversion volume of the chemical diverter, wherein the diversion volume is calculated as a mass or concentration of the chemical diverter per perforation of a number of perforations that exit the wellbore within the subset of fracture stages;
- (g) pumping a portion of the total treatment volume into the wellbore for the selected chemical stage;
- (h) pumping the diversion volume comprising the chemical diverter into the wellbore to close off the subset of fracture stages;
- and
- (i) repeating steps (c)-(h) for a second chemical stage of the plurality of chemical stages.
Dependencies are inferred from the claim text.