Perforation Inflow Diagnostic (#PID) #welltests can be conducted in high permeability systems. Analytical results are useful for testing-on-the-fly decisions, tie-in decisions and facility infrastructure planning. For specific fields and pools, correlations can be developed whereby tie-in decisions can be
Production Testing crews take note: daylight savings time changes should NEVER be adjusted during a #welltest. Production tests MUST terminate in whatever time standard the test was started in. Pressure recorder clocks aren’t going to stop for an hour,
Pre-frac’ #welltests have proven successful using closed chamber methods. Surface pressures are recorded during perforation. The surface pressure buildup is proportional to gas influx into the closed chamber (wellbore). Quantitative order-of-magnitude results (kh, s’) can be estimated using Perforation
Sometimes using surface pressure data is the only practical testing method available. This example illustrates a #welltest where downhole gauges were set below an open sliding sleeve that was above the perforations. Valid pressure transient data were totally obliterated
Surface pressure data recorders
can be a valuable #welltesting tool. Validity of the technique is demonstrated
by two illustrations. This example flow and buildup #welltest was conducted on a 350 m low density sweet
gas well with both subsurface
If a liquid level is the only requirement then a wellbore schematic with tubing data (for collar counts), and gas properties (for velocity calculations) are sufficient. An appropriate natural gas relative density (i.e. a mixed gas) is critical for
While we’re featuring #AWS surveys, who remembers these 10 Point Calipers for reading paper charts? Google doesn’t even seem to know anything about them. They make counting collars easier, and more accurate, as sound waves actually speed up with
Factory setting paper chart speed for an Echometer™ model D #AWS is 9.2075 cm/s. This can change with age, environment, level of use, and battery charge. Don’t pull on the chart as it comes off the machine. Some
Sonic surveys can also be conducted down: an annulus (casing) with coiled, endless, or seamless tubing installed; inside coiled tubing; inside casing only; even inside drill pipe. Acoustic velocity methods are then employed for depth calculations. This requires an
Great to see an upswing in new production activity early this Autumn, for both oil and gas wells coming on stream. Narratives around #LNG sound better every month, too, with positive announcements recently, shipping to both east and west