Well Performance and Completion Effectiveness in the Baldy Butte Field, Washakie Basin, Wyoming

Abstract

This paper w selected for presentation by an SFfZ Program Canmiftee fdlwing review C4 information cadainsd in an alxtrsct submitted by the author(s), Ccmtsnt% of the paper, as presented, have not been reviewed by the society of Petroleum Engineers and are subjsct to correction by the abthor(s), The material, as' presented, does not necessarily reflect sny position of the Sodety of Pefrokum Engineers, its offcers, or membem Pspem presented at SPE meetings are subject to publication review by Editorial Ccmmiis of the Scciety of Petroleum Engineers. Ebctronic reproduction, distribution, or storage cd any part of this psper for -ercial purfxxes vAthout the witten mnsent of the Society of Petroleum Engineers is pmhibti, Penni5si0n to reproduce in print is rsdrkfed to an absfract c# not more than S03 words iktrations msy not be cqied. The abstrsct must contdn consdcuous aclmwfedgment of where and by wfwn the paper was presented, Write Librsrian, SPE, P.O. &ax S33336, Richardson, TX 7W&lS-3836, U.S.A., fsx 01 -972-952-94SS. AbstractThe Baldy Butte field is Ioeated in the East Washakie subbasin of the Greater Green River Basin and is several miles east of the proliiic Echo Springs/ Standard Draw Almond bar sand trend. Wells are completed in the upper 300 to 400 ft of the Ahnond formation (Upper Mesaverde), at a true-vertical depth of around 8000 R Production is wet-gas (10-14 bbl of condensate/ mmscf gas) and occurs from naturally fractured low-stand deltaic, marine and fluvial point-bar sand deposits. These sands are over-pressured (0.57 psi/ft gradient), possess an average permeability of 0.04 md, and exhibit variable continuity within the field. Most of the field development has occurred over the last 2 % years, and has involved contrasting well-completion methods, each specitlc to the three companies that operate wells in the field. This paper documents an analysis of 29 reeen~contiguous completions in the Baldy Butte fiel~comparing the effectiveness of the three contrasting completiord stimulation methods. The evaluation was based primarily on use of the reciprocal productivity index (RPI) graphical production-analysis method. Using RPI, daily production and wellhead pressure data for each well was used to dissect well performance, obtaining information on reservoir flow capacity, stimulation effectiveness, reservoir flow geometry, drained areaholume, and produced liquid management. Distinct differences in reservoir quality and effectiveness among the contrasting completion methods were observed.