Abstn4ct A new placement system for sand consolidation p[aslic has been developed to increase success ralios anti to extend use of plastic to sands with variable pernwability, dir-IY sands and long or discontinuous completion in(ervais. Plaxtic sand consolidation fluids are distributed uniformly through a series of fluid f?ow control modules with each module covering 2 ft of comple(ed interval. Active modules can be seputwtec[ by blank spacers to cover a nunlber of individual completed sections in a total interval of 50 ft. Further development is in progress to cover iongerintervals. Equiptnent operation, perforation control and contpletion program recommendations are discussed. The system Ims been used in about 75 completions covering up to five individual sand members in total inlervals up to 41 jt. Successful plas:ic sand consolidatiotz has been obtained in many sands where other sand control Inefhods were unsuccessful, Use of the new plastic i)liectiotl systetn itnprores developtttcui economics in sancl problem areas in three important ways: (1) better fluid injection control increases completion success ratio, (2) greater p[acetnent ve-Iiability permits reduction in chemical cost and pumping ritne and (3) one-trip covevage of discontimions zones significantly reduces completion cos~contpaved 10 n series of individual packer seitings.

A two-part study was conducted to define optimal gravel-pack procedures for some high-angle well completions in an area operated by Chevron U.S.A. Inc. In the first part of the study, gravel slurries were pumped through a I,080-ft [329-m] tubing string to simulate actual slurry transport conditions in high-angle wells. The tubing string had an inclination of 80° [1.4 rad] from vertical. Measurements were made to determine suitable viscosity and solids concentration for effective gravel transport. In the second part of the study, a full-scale cased-hole completion model was constructed. Gravel slurries that had satisfactory transport performance were tested for packing characteristics in the model well bore (completion interval). The need for special completioninterval geometry to obtain satisfactory packs was investigated.Results showed that high-viscosity carrier fluids (600 to 700 cp [0.6 to 0.7 Pa's]) with high gravel concentrations (15 Ibm/gal [1797 g/ dm 3 ]) provide good transport, but they are unsuitable for use in completion intervals in wells with angles of 80° [1.4 rad] from vertical. Satisfactory transport and improved packing were achieved with lower carrier viscosity and concentration (300 to 400 cp, 4 Ibm/gal [0.3 to 0.4 Pa' s, 479 g/dm 3]). Special liner-tailpipe (washpipe) geometry considerations reported by previous investigators are required in conjunction with the optimal slurry properties defined in this study.Completion operations designed from results of this study have satisfactorily met general placement criteria. Field experience to date has been in wells with inclinations up to 80 ° [1.4 rad] from vertical.

The first problem is mechanical,which can be overcomeonly by improvingthe operating A com~uterized method for calculating procedures,such as gravelplacementand stze well productivitywas used to studyten gravelselection. The secondproblem is more difficult packed inner liner completionsin the Louisiana to solvebecause any installationof a downhole Gulf Coast area. Used as a perfomance-diagdeviceproducesan additionalresistanceto nostictool, the method producedestimatesfor flow, impairingproductivity. The best that certainunknowncompletionparametersfrom known productivityinformation, revealing