NOVEL PERFORATING CHARGES MAXIMIZES OIL PRODUCTION VERIFYING THE MODELED PERFORATION PERFORMANCE

摘要

Perforating long intervals on horizontal wellsrnrequires a dedicated understanding of the reservoirrnproperties and diligent perforation design. MedcornLLC (Oman) decided to perforate three reservoirrnintervals (133 m) of a highly deviated well with thernoptimum perforation charges for maximized oilrnproductivity while minimizing the number of runsrnrequired. An underbalanced perforating strategyrnwas embraced to better clean the perforation tunnelsrnposterior to detonation and hence to increase thernwell to reservoir communication quality.rnPerforating design was performed by Schlumbergerrnproprietary perforation analysis software torncompare the various gun systems and the resultingrnwell productivities. Perforations were conveyed onrntubing and the gun shock models were created tornensure flawless operations that might be jeopardizedrnby the shocks resulting from the perforating job.rnAs a result, the perforation operation wasrnsuccessfully performed without any operational andrnHSE issues. The actual production was in line withrnthe expectations as predicted by the perforationrnanalysis software. Production from the well wasrnactually better than the neighboring wells in thernsame region.rnMedco’s choice on the novel perforation chargernselection proved to be a fulfilling and smartrndecision. The predicted production rates werernmatched by actual oil production proving therncertainty of the input parameters for perforation andrnproductivity modeling such as reservoirrnpermeability, porosity and the fluid characteristics.rnThe incremental cost on the perforation gun systemrnhas imperatively paid off by the gained productionrnof oil. In this paper we discuss the lessons learnedrnfrom the operational stand point as well as the well to reservoir communication efficiencies as predictedrnand actually occurred. The rock based perforationrnpenetration and a productivity model is alsorndiscussed in detail.