Santos Limited · ASX:STO
Santos — Corporate Update (March 2012)
7 slides from Santos's corporate update, Mar 27, 2012
Slide 1: NSW CSG Well Abandonment
NSW CSG Well Abandonment Presented by Rohan Richardson, well abandonment and Ann Stewart, site rehabilitation to the Santos Community Committee – Upper Hunter, Tuesday, March 27, 2012. 1
Slide 2: Abandoning a CSG Well in NSW
Abandoning a CSG Well in NSW NSW CSG wells are abandoned in accordance with the following: State Regulation: Schedule of Onshore Petroleum Exploration and Production Safety Requirements, August 1992; Environmental guidelines: Petroleum Licence conditions and Review of Environmental Factors, REF’
Slide 3: Abandoning a CSG well in NSW
Abandoning a CSG well in NSW Excerpts from the NSW Well Integrity Code of Practice: The requisite outcomes of well abandonment are: - To achieve aquifer zone and coal seam isolation that existed before the well was drilled and constructed - A well must not be abandoned without Departmental approval
Slide 4: Knowledge of Sub Surface Rocks
Knowledge of Sub Surface Rocks During exploration drilling, data can be collected by means of coring, logging, testing and through cuttings analysis, to determine the characteristics of the formations drilled. These characteristics include: lithology (type of rock) and location of aquifers Forma
Slide 5: Cement Design
Cement Design The design criteria of a NSW CSG well abandonment is: To fill the well with a naturally occurring, non corrosive, high compressive strength material when compared to neighbouring rock, that wont degrade, has very low permeability and porosity and can be set in place in a fluid state to
Slide 6: The Process
The Process • An abandonment includes filling the entire wellbore from bottom to surface with cement in cement ‘plug’ stages. • All open hole ‘plugs’ are left to set and tagged to confirm placement before the next one is pumped. • Once a cement ‘plug’ top is inside casing, it is left to set and tagg
Slide 7: Questions?
Thank You Questions ? Santos