DEPART MENT OF MINES AND ENERGY GUIDELINE Well Plug and Abandonment Applications Requirements Reference to Clause 528 “Approval to Abandon or Suspend a Well” and Clause 529 “Abandonment of a Well” in the NT Schedule of Onshore Petroleum Exploration and Production Requirements 2012. Plug and Abandonment (P & A) Applications are required to: o Address the requirements of Clause 529 appropriate to the construction and status of the well o Include the installation and validation of a minimum of two (2) permanent downhole barriers. Applications for Well Plug and Abandonment Plug and Abandonment (P & A) applications are to consist of the following: 1. Letter of application, signed by the custodian of the project and making reference to Clause 528 of the Schedule of Onshore Petroleum Exploration and Production Requirements 2012. 2. The specific reason for the P & A as per Clause 528 (5)(a). 3. P & A Program reflecting the step by step procedures the rig will follow when installing and then validating the integrity of barriers (to be validated by either tagging or pressure testing). 4. Proposed final well schematic with all well construction features labelled, including the proposed position of installed barriers. The well’s final kill fluid weight is to be included (as attached Sample Diagram). NOTE: NO CASING CAN BE RECOVERED IF IT WILL EXPOSE ANY ABNORMAL PRESSURE, LOST CIRCULATION, HYDROCARBON OR WATER BEARING ZONE. ALL PERMANENT BARRIERS ARE TO BE CLEARLY IDENTIFIED ON THE FINAL WELL SCHEMATIC Petroleum Operations Last Update: October 2014 Page 1 of 3 DEPART MENT OF MINES AND ENERGY GUIDELINE Sample Diagram: Identifying all permanent barriers in the wellbore and signage at the surface. Steel Post and Signage w ith Well and Operator details. Ground Level Minimum: 15m Surface Cement Plug Minimum: 30m Conductor Casing Kill Fluid with Corrosion Inhibitor Surface Cement Plug Minimum: 30m above perforation in the well Surface Casing Perforation Zone Production Casing Petroleum Operations Last Update: October 2014 Page 2 of 3 DEPART MENT OF MINES AND ENERGY GUIDELINE For Well Plug and Abandonment Activity Close-out Please submit: Daily Drilling Reports to be sent as usual and reflecting the entire P & A until activity close-out. The Final Well Schematic reflecting all well construction features (labelled) the position of ALL validated barriers and also the final brine weight. Details relating to ALL installed barriers are to include: o o o o o Barrier type (cement plug, mechanical plug etc.) Bottom depth of barrier (m) Top depth of barrier (m) Tagging weight (lbs), unless pressure tested Pressure test (psi), unless tagged. Photographs of the well site along with surface signage reflecting well and operator details. At least 4 photographs will be required. ADDITIONAL GUIDING INFORMATION Checklists and guidelines for various petroleum activities are available on the Department of Mines and Energy’s website at: http://www.nt.gov.au/d/Minerals_Energy/ Contact the Petroleum Operations Team on petroleum.operations@nt.gov.au for further information. - END - Petroleum Operations Last Update: October 2014 Page 3 of 3