More than Just PTA… Temperature validation and differentials help with qualitative assessment and adds value. This example displays liquid influx and wellbore hydrodynamics throughout both flow and buildup periods. Thermal diagnostics have saved economic wells by illustrating unexpected liquid
More than Just PTA… While PID and PIDD tests have their place as stand-alone assessment tools, this example of added value wasn’t planned that way! To shorten a long, complicated story, two zones were perforated before installing an isolation
More than Just PTA… Checking differentials provides added value. The operator was ready to walk away from this well due to uneconomically low gas rates. However, note the huge tubing/casing differential, not to mention the casing pressure trend shift
More than Just PTA… Checking differentials provides added value. Note this case where an unusual reversal was exhibited by the tubing/casing differential after flowing the well. This suggested there may have been an air column trapped in the annulus.
PTA is an Exploration tool when we conduct a drill stem test (DST). DST’s are one of the first tests we can run, while drilling, thus in the open hole environment. DST’s are simple closed chamber impulse tests, dual
PTA is a Management tool for decision tree analysis. PTA is an invaluable piece of the complex hydrocarbon recovery puzzle, where everything is measured indirectly and interpreted by a team of specialists. Corroborating with seismic, core, logs, cross-sections, maps,
PTA is an Evaluation tool when we forecast hypothetical cases to probe and ascertain project viability. Theoretical, what-if, scenarios can be generated to evaluate economics and feasibility of proposed projects. For example, completing a PTA once, management wondered what-if
PTA is a Marketing tool when we generate theoretical test designs for financial sales presentations. Externally for attracting capital investment, or internally for budget proposals. Hypothetical, what-if, scenarios can easily be generated, complete with productivity forecasts into the future.
PTA is a Geological tool when we test CBM desorption properties. Coalbed Methane (CBM) is a Biogenic gas, very high C1 content, clean burning, plentiful here in Alberta, Canada, perfect for heating homes, stores, barns, workshops, and greenhouses from
PTA is a Reserves tool when we analyze gas material balance. Of course, MBA requires at least two satisfactory test results and quality production accounting. Maybe two tests are okay for a single well, but in a pool with