Impulse, Perforation, and Closed Chamber Testing: Simple, Quick, Cost-Effective Snapshots of Reservoir Inflow Characteristics

摘要

Impulse tests, Perforation Inflow Diagnostic (PID) tests and Closed Chamber tests are all similar in methodology. By whatever name, they provide simple, quick, cost-effective snapshots of maximum reservoir inflow characteristics. In a matter of minutes a field Engineer can provide estimates of the maximum AOF or IPR capability, the skin effect and flow capacity of a zone. Liquid influx can also be quantified.rnApplications include pre-frac reservoir assessments, multiple-layer perforation inflow distribution diagnostics (PIDD), establishing initial reservoir pressures, evaluating moveable gas in shaley zones or very low permeability horizons (reserves additions), flowing or pumping oil well tests, closed chamber drillstem tests (CCDST), and surface casing vent tests. With some conventional flow & buildup tests and production history as background, PID response can be correlated to stabilized gas rates for instantaneous tie-in orfrac decisions, a benefit to expedient shallow gas exploitation.rnFor all of these tests, data has been recorded in realtime at surface. Rigorous testing utilizes modernrnelectronic surface data acquisition equipment and various software. A proprietary hardware & software system is also available. In it's simplest, most cost-effective and exploitive form, measurements with a hand-held pressure gauge are known to be 'good enough'.rnAnalytical theory for these tests is well documented. While the tests have been around for some time, the techniques are under-utilized in Western Canada.