This in-house manual is designed to assist NTGS staff in organising stratigraphic drilling programs and supervising on site. It is directed to those with little or no previous experience of drilling. It gives in-house guidelines and does not purport to reiterate government policy concerning drilling, unless this is explicitly acknowledged. It is not a textbook on drilling nor is it intended to be as comprehensive as company manuals. For comparison, the 1996 Santos onshore drilling operations manual is over 400 pages in length, including 58 pages of forms. In the present manual, much of the drillers’ jargon is explained in references listed in Appendix 1, and a glossary of common abbreviations provided in Appendix 2.Australian Standards referred to throughout the document are shown in the format AS1234. The symbol % is used to indicate guidelines, procedures and checks for the NTGS site Representative. The symbol is used to distinguish worked examples of calculations. An index provides quick reference to specific topics. It is anticipated that this document will be revised regularly, and any corrections or comments should be directed to the author or the Editorial Geologist Source: TSAYO BOGNING GAIUS MARCIAL, LinkedIn