Methods are circulated degradable material assisted diversion (CMAD) for well treatment in completed wells. A slurry of solid degradable material is circulated in the well with return of excess slurry, a plug of the degradable material is formed, a downhole operation is performed around the plug div
Methods are circulated degradable material assisted diversion (CMAD) for well treatment in completed wells. A slurry of solid degradable material is circulated in the well with return of excess slurry, a plug of the degradable material is formed, a downhole operation is performed around the plug diverter, and the plug is then degraded for removal. Degradation triggers can be temperature or chemical reactants, with optional accelerators or retarders to provide the desired timing for plug removal. In multilayer formation CMAD fracturing, the plug isolates a completed fracture while additional layers are sequentially fractured and plugged, and then the plugs are removed for flowback from the fractured layers.
대표청구항▼
1. A method of well treatment comprising: a) deploying a tubular string to a position at or below a target interval;b) treating the target interval; and,c) circulating a diverting slurry comprising a solids volume fraction of from about 0.05 to about 0.56 past the target interval to form a temporary
1. A method of well treatment comprising: a) deploying a tubular string to a position at or below a target interval;b) treating the target interval; and,c) circulating a diverting slurry comprising a solids volume fraction of from about 0.05 to about 0.56 past the target interval to form a temporary plug containing an insoluble degradable material at the target interval. 2. The method of claim 1, wherein the tubular string is coiled tubing. 3. The method of claim 1, wherein the tubular string is jointed pipe. 4. The method of claim 1, wherein the treating comprises fracturing or acidizing. 5. The method of claim 1, further comprising: increasing fluid pressure in the wellbore at a time before the diverting slurry has been circulated past the target interval. 6. The method of claim 5, wherein the step of increasing the pressure comprises increasing a flow rate of the diverting slurry to increase friction pressure of a return flow slurry. 7. The method of claim 5, wherein the step of increasing the pressure comprises restricting fluid flow at the surface or down hole with a valve or choke apparatus on a return flow stream. 8. The method of claim 5, wherein the step of increasing the pressure comprises pumping a heavier weighted fluid ahead of the diverting slurry to increase hydrostatic pressure of a return stream. 9. The method of claim 1, wherein a plurality of intervals are diverted. 10. A method of well treatment, comprising: a) injecting a slurry into a completed well bore penetrating a formation, wherein a solids phase of the slurry comprises an insoluble degradable material;b) circulating the slurry through at least a portion of the well bore in contact with a surface comprising one or more openings in fluid communication with a first permeable formation;c) consolidating the degradable material to form a plug of the degradable material in the one or more openings to block fluid communication between the well bore and the first permeable formation, wherein a flow of the slurry is maintained in the well bore during the circulation and consolidating steps to inhibit gravitational settling of the solids and bridging in the wellbore;d) performing a downhole operation in the well while the degradable material assists diversion from the plugged first permeable formation, wherein the downhole operation is selected from the group consisting of hydraulic fracturing, acidizing, well repair, installation of downhole equipment, and combinations thereof, wherein any of the degradable material unused in the plug is kept clear from the downhole operation; and,e) degrading the consolidated degradable material to remove the plug and restore fluid communication with the first permeable formation. 11. The method of claim 10, wherein the degradable material is present in the slurry at a concentration of at least 1.2 g/L (10 lbm/1,000 gal). 12. The method of claim 10, wherein the consolidation comprises inducing a screenout of the solids phase. 13. The method of claim 10, wherein a volume fraction of the solids phase of the slurry comprises from 0.05 to 0.56 of the slurry volume. 14. The method of claim 10, wherein the solids phase includes fiber. 15. The method of claim 10 wherein the solids phase comprises a mixture of a fiber and a particulate material, wherein at least one of the fiber and particulate material is degradable. 16. A circulated degradable material assisted diversion (CMAD) fracturing method, comprising the sequential steps of: (a) injecting well treatment fluid into a well penetrating a multilayer formation to propagate a hydraulic fracture in a layer of the formation, wherein the well comprises first and second isolated passageways;(b) circulating an aqueous slurry past the fracture, wherein the slurry comprises fibers of an insoluble, degradable material in a solids phase to form a plug of the consolidated fibers and isolate the hydraulic fracture from the wellbore, wherein the degradable material is present in the slurry at a concentration of at least 1.2 g/L (10 lbm/1,000 gal), and wherein a fluid phase of the slurry comprises a viscoelastic surfactant, a co-surfactant, a rheology modifier, a polymer friction reducer, a surfactant friction reducer, a polymeric drag reduction enhancer, a monomeric drag reduction enhancer, an aqueous brine, or a combination or mixture thereof;(c) transferring excess slurry from the plug in step (b) to one of the first and second passageways;(d) with the plug diverting from the previous hydraulic fracture and while isolating the excess slurry in one of the first and second passageways, injecting well treatment fluid into the other one of the first and second passageways to propagate a subsequent hydraulic fracture in another layer of the formation; and,(e) thereafter degrading the degradable material to remove the plug. 17. The CMAD fracturing method of claim 16 wherein the first passageway comprises a tubular and the second passageway comprises an annulus between the tubular and a wellbore. 18. The CMAD fracturing method of claim 17, further comprising sequentially repeating steps (b), (c) and (d) one or more times with an alternated slurry flow direction and alternated first and second passageways between excess slurry isolation and treatment fluid injection. 19. The CMAD fracturing method of claim 16, further comprising sequentially repeating steps (b), (c) and (d) one or a plurality of times for diversion from the previous hydraulic fractures and propagation of subsequent hydraulic fracture(s) in other layer(s), wherein the plugs are thereafter removed in step (e) by degrading the degradable material. 20. The CMAD fracturing method of claim 16, further comprising the step of perforation in advance of the fracture propagation in steps (a) and (d). 21. The CMAD fracturing method of claim 16, wherein the slurry circulation comprises a terminal portion of a tail stage of the hydraulic fracturing. 22. The CMAD fracturing method of claim 16, comprising maintaining a pressure in the wellbore adjacent the plug that is above the formation pressure of the hydraulic fracture isolated from the wellbore in step (b).
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