Alberta’s 14 Day Rule

Allows for an Initial or Annual #welltest to be submitted without analysis (#PTA). Conventional static gradient surveys, with a 10–15 minute on-bottom stop, are acceptable. Sometimes the extended gauge won’t pass the 2 kPa Rule, but the gradient will, because the shut-in was >14 days. Subsurface pressures are mandatory for compliance with #AER Initial pressure regulations for Gas, Oil, and SD — Commingled wells. For annual gas well (#LNG) requirements surface AWS surveys will be rejected if the fluid level is above the...

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Mini-Frac’ DFIT Testing

Doubles For Initial Test… Mini-frac’ or Diagnostic Fracture Injection Tests (#DFIT) help double your #welltest efficiency if pressure gauges are downhole. G-Function analysis estimates closure stress, pore pressure, and leak-off type. After-Closure analysis may provide an estimate of flow capacity (kh) for use in fracture stimulation design. What isn’t specifically clear in #AER D40 is that pressure transient analysis (#PTA) is acceptable for estimating Initial Pressure Oil or Gas (#LNG) conditions (p*). Conceptionally, DFIT is...

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Calgary Flood News

We would like to extend our sympathy and understanding to all of our fellow Calgarians during this unprecedented natural disaster. This catastrophe has obviously impacted everybody in our community, and the economic ripples will be felt across Canada. My parents were amongst the thousands evacuated from Sunnyside, and are presently staying with us until electricity and sewer services are restored. Welltest Specialists is fortunate to be high and dry, our technology is fully operational, and our virtual office is open for business as usual. If...

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Perforation Inflow Diagnostic Tests

Perforation Inflow Diagnostic (PID) tests satisfy ERCB Initial Pressure requirements. These simplified tests, now in common usage, provide an economical alternative to traditional methods. Basically the well is perforated under-balanced, and the subsequent closed chamber pressure build-up is monitored with subsurface pressure recorders. Data are then analyzed using impulse or closed-chamber theory (PITA) to generate a p*. What’s not specifically clear in G40 is that Pressure Transient Analysis (PTA) is acceptable for estimating Initial...

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Perforation, Fracture Fall-off, & Formation Leak-off Tests

Perforation, fracture fall-off, and formation leak-off tests satisfy ERCB Initial Pressure requirements. These simplified tests, now in common usage, provide an economical alternative to traditional methods. There are several different scenarios, depending on your completion operation logistics. One method is basically over-balanced perforating and monitoring the subsequent pressure fall-off feed into the reservoir. Another is to land a horizontal multi-stage frac’ string, open the toe hydro-port, and monitor the pressure fall-off feed into...

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