SECTION-1: DRIVING CONDUCTOR PIPE 40”, 30”, 20” AND 18 ⅝”
SECTION-2: 36” HOLE FOR 30” CONDUCTOR PIPE
SECTION-3: 26” HOLE FOR 18 ⅝” CASING
SECTION-4: 17 ½” HOLE FOR 13 ⅜” CASING
SECTION-5: 12 ¼” HOLE FOR 9 ⅝” CASING
SECTION-6: 8 ½“ HOLE FOR 7” PRODUCTION LINER
SECTION-7: 6” OPENHOLE

Source: Mourad CHETTAH

Le forage à circulation inverse est une technique de forage destructif. Ici on utilise un marteau fond de trou (MFT) qui permet de récupérer les échantillons en continu à l’aide d’air comprimé utilisé comme fluide de circulation.

Il est dit à circulation inverse puisque puisque pendant que les échantillons remonte par l’intérieur des tiges, l’air lui circule dans l’espace annulaire.

Ce mécanisme réduit donc de manière considérable le contact entre les échantillons et la paroi de forage à l’opposé des méthodes ordinaires.

✓ Le forage RC est utilisé dans le domaine minier pour le Grade control.

✓ L’outillage est constitué d’un bit monté sur un MFT d’un mètre de longueur. Cet assemblage est fixé sur la première tige. Chaque tige a une masse de 150 Kilogramme avec un diamètre de 124 millimètres.

✓ Elle permet d’effectuer des forages dans de la roche dure jusqu’à 230 mètres de profondeur.

✓ Avant de commencer le forage RC, le géologue ou spotter doit vérifier la correspondance entre le plan et les points de sondage.

✓ L’objectif majeur ici est l’identification des blocs minéralisés et le stérile dans le but d’améliorer le modèle géologique.

Source: TSAYO BOGNING GAIUS MARCIAL

Drilling fluids are becoming so specialized, most companies now have a mud engineer on duty at all times to keep the mud in good condition. The Mud Engineer:
– is responsible for testing the mud and for prescribing mud treatments in order to keep mud weight, properties, and chemistry within recommended limits.
– must give detailed recommendations in order to optimize the achievement of technical and economical drilling aims

Source: Mourad CHETTAH

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

1- DAILY CHECKLIST
2- DRILLING PROBLEMS
3- BOP TEST
4- ACCUMULATOR DRAWDOWN TEST
5- FORMATION TEST
6- EVALUATE TOTAL SERVICE AND CUT-OFF PRACTICE
7- DRILL STRING DESIGN
8- RUNNING CASING
9- INSPECTION CATEGORY
10- CALCULATION
11- TUBULAR DATASHEETS
12-IADC ACTIVITY CODES

Source: Manar Chirine KHITER, LinkedIn

1- Down hole problems
A- stuck pipe: When the drill string is no longer free to move up, down, or rotate as the driller wants it to, the drill pipe is stuck. Sticking can occur while drilling, making a connection, logging, testing, or during any kind of operation which involves leaving the equipment in the hole.

B- Shale Instability
3- Unconsolidated Formation
4-Fractured Formation
5- Cement Blocks

B- LOST CIRCULATION

C- WELL CONTROL

Source: Manar Chirine KHITER, LinkedIn
Herish .w. noree , Kirkuk oil training institute

The world is going underground and a manifestation of that is the growth in tunnelling and underground space in and around our cities, the expansion in mines seeking underground resources, and the increase in hydroelectric power where man can build on the opportunities provided by nature. The present workshop brings together those involved globally in the construction of tunnels in rock, underground caverns, and underground space technology using the drilling and blasting method. Tunnel construction project managers and operators, mining and geotechnical engineers, underground space operators, government and regulatory authorities and end users and owners of the infrastructure created can review current and future technologies and benefit from the shared experience included in the proceedings.

The topics covered in the workshop include drilling equipment, explosives and delivery systems used in tunnelling, and initiation systems including those based on electronic delay detonators. Modern methods of blast design for safe and rapid tunnelling given the challenges of the geological setting are discussed. Methods of assessing a tunnel blast outcome are canvassed with case studies that consider excavation and geotechnical issues based on the experience of the authors and presenters. Software is used in various parts of a tunnel construction and the workshop covers the current state of the art in this important and growing area. The workshop describes tools such as MWD (measurement while drilling) designed to aid the assessment of rock mass conditions ahead and around the tunnel heading. A significant consideration is the environmental effects of the tunnelling process and a number of approaches to assessing and predicting ground vibration from tunnel blasting are presented.

Source: Mohamed Taha EL M’HAMDI, LinkedIn

WORKSHOP HOSTED BY FRAGBLAST 10 — THE 10TH INTERNATIONAL SYMPOSIUM ON
ROCK FRAGMENTATION BY BLASTING, NEW DELHI, INDIA, 24–25 NOVEMBER 2012

Tunnelling in Rock by Drilling and Blasting – Spathis & Gupta (Eds)
© 2013 Taylor & Francis Group, London, ISBN 978-0-415-62141-0