Production Issues Influencing The Choice Of Completion Type In Horizontal Wells With Sanding Problems

摘要

The aim of this study was to examine wells in the same sandrnbodies in a field (designated as F1) in West Africa torndetermine which sand control completion option was the morernefficient in a given situation, expandable sand screens (ESS?),rnexternal open hole gravel packs, stand alone screens andrnslotted/perforated liners.rnThe planned basis for comparison was to compare thernproductivity index per foot for each completion type. Therernwere expandable screens, slotted and predrilled linerrncompletions in the same sand body in the F1 field. The slottedrnand predrilled liners all had PLT logs from which to calculaternPI values and the ESS well did not. The PI for the ESS wellrnhad therefore to be calculated using well inflow software.rnThis then allowed a direct ranking of the PI/ft for eachrncompletion type. The ESS well had the highest PI/ft of therncompletions at 0.45 bpd/psi/ft; as compared to the slottedrnliners at 0.04-0.18 and the predrilled liners at 0.10-0.17. Onernother horizontal ESS well in a similar field (designated F2)rnwas also used because it did have accurate PI informationrnfrom a PLT log. This gave a PI/ft = 0.57 bopd/psi/ft which isrnsimilar to the simulated value for the ESS well in the F1 field.rnAnother aspect of the different completions is the variationrnin friction pressure between completion types such as ESSrnscreens and EGP. The friction pressures in an ESS completionrnare lower than a typical EGP, standalone screen or slotted linerrncompletion. This gives a very homogeneous inflow profile forrnthe ESS completion due to the increased production bore.rnThe EGP completion has a higher flow at the heel of the well;rnthis accelerates water influx. The heel breakthrough time wasrncalculated using an analytical model for the ESS and EGPrncompletions for the F1 ESS well configuration. For the ESSrncompletion, the predicted water breakthrough time was 191rn? ESS is a registered trademark of Weatherford Lamb Incrndays, which was close to the observed value in the well. Thernsmallest EGP completion had predicted water breakthrough inrn88 days.rnNumerical simulations were also used to better understandrnwater inflow and to test the assumptions in the analyticalrnmodel. The simulations show a similar behaviour to thernanalytical model with water cresting up rapidly to the heel ofrnthe EGP well.