已发表: 09/13/2019
已发表: 09/13/2019
Bond logs from conventionally cemented and completed wells indicated severe channeling behind the casing of multistage horizontal wells, which can reduce fracturing efficiency as fluids migrate into unintended zones.
Industry-accepted cementing best practices, including running centralizers.
Add Fulcrum technology to the well cement to react with leftover drilling fluid; assess performance with the Isolation Scanner cement evaluation service.
Montage Resources engineers agreed to cement two horizontal wells conventionally and then cement two comparable neighboring wells with the same design except for the addition of the Fulcrum technology. In order to evaluate the difference, it was agreed to run Isolation Scanner service on one well that was cemented conventionally and on another well cemented with Fulcrum technology. The well cemented with Fulcrum technology showed better bonding and isolation both on the impedance boundary condition and the sonic tool.
Later, during stimulation, the two wells cemented with Fulcrum technology had an average of 800-psi higher breakdown pressure as compared with the breakdown pressures in two wells cemented with conventional cement systems. Higher breakdown pressure is associated with improved stage-to-stage isolation, which enables more efficient fracture placement.
In a head-to-head test in neighboring wells, Fulcrum cement-conveyed frac performance technology improved cement bonding and interstage isolation as demonstrated by cement bond logs and higher breakdown pressures during subsequent fracturing operations.
