Heart, lung and samples of blood from 230 dogs were examined for infections of filarial parasites. Dirofilaria immitis worms and microfilariae were detected in one dog. Blood samples from a further 1428 dogs were examined for microfilariae and 22 were found to be infected. Eighteen dogs were infected with D immitis microfilariae and four with Dipetolonema reconditum microfilariae. The histories were available for 18 of the dogs infected with heartworm and only seven dogs had not travelled outside South Australia. It was concluded that heartworm infection was endemic in South Australia but the apparent prevalence was only about 1%.

This paper (SPE 51182) was revised for publication from paper SPE 38483, first presented at the 1997 Offshore Europe held in Aberdeen, 9-12 September. Original manuscript received for review 13 November 1997. Revised manuscript received 7 June 1998. Paper peer approved 15 June 1998. Summary A number of issues can arise when drilling through Zechstein formations that have a bearing on the health and safety of personnel, as well as on the time to complete operations and final well costs. Operational problems present some intrinsic hazard or safety risk. Additionally, the procedures applied to alleviate these problems also present a safety risk, as they are usually nonroutine and unfamiliar, thus increasing the likelihood of errors. In this paper, the operational issues, their causative mechanisms, and alleviation procedures are introduced and categorized. Decision analysis is applied to each of the operational issues, for both the well planning stage and for the drillsite, which relates the well responses to the causative mechanism and, therefore, to the selection of the most appropriate alleviation procedure. P. 174

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