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This paper was~paredfor presentation al the 1998 lADC/SPE Asia Pacific Drilling Conference held in Jakarta, Indonesia, 7-9 Septembr 1998, This paper was s~ec[ed for presentation by an [ADC/SPE Pr@ram Commiftw following review of information cnnlained in en abstract submitted by the author(s). Contents of the paper, as presented, have not been revjewed by the International Association of Driffing Contractors or the Society of Petroleum Engineers and are subject to correction by the author(s) The material, as presented, does not necessarily reflact any~sition of the IADC or SPE, their oficers, w members. Papers~esented at the IADCISPE maatings are subject to publication review by Editorial Committees of the IADC and SPE, Electronic reproduction, d!.stnbution, or stcfage of any part of this paper fof mmmercial purposes without the written mnsent of the Society of Petroleum Engineers is prohibited Permission to reproduce in print isresk!cled to an abstract of not more than 300 words, illustrations may not b mpied The abstract must mntain conspicuous acknowledgment of whare and by whom the paper was presentd Write Librariw, SPE, P 0, Box 833836, Richardsm TX 7S083-3B36. U. S.A., fax 01-972-952-9435. Abstract

Waste water disposal is one of the many environmental issues becoming increasingly difficult to deal with. A single disposal well may not be sufficient to handle the large volume of waste water generated by many industrial plants.Increasing the injectivity of a well by hydraulic fracturing is a viable solution to this problem. This paper discusses the application of a numerical water injection simulator to evaluate a low permeability sandstone reservoir for waste water disposal. The injection model is used to study the effects and feasibility of hydraulically fracturing the reservoir to improve injectivity.Also discussed are the field implementation of the hydraulic fracturing treatment, testing of the well to evaluate the treatment, and a comparison of observed and simulated injectivity.A description of the model and results from the actual case history are presented.

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