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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DFIT: Doubles for Initial Test…

Mini-frac’ or Diagnostic Fracture Injection Tests (DFIT) help double your testing efficiency if subsurface pressures are recorded. First, a successful DFIT helps estimate hydraulic fracture closure pressure and reservoir flow properties – valuable information for stimulation design. Second, the resulting pressure fall-off can be analyzed to provide the ERCB with Initial Pressure Oil requirements. As operational logistics allow, the longer the shut-in the better, but micro-permeability systems will probably never reveal pseudo-radial flow...

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ERCB Guide 40 Misconceptions Re: Initial Pressure

What’s not specifically clear in G40 is that Pressure Transient Analysis (PTA) is acceptable for estimating Initial Pressure Oil and Initial Pressure Gas conditions.      Misconception #1: all tests have to pass the 2 kPa Rule. Not True. Misconception #2: if a test doesn’t pass the 2 kPa Rule it has to be shut-in >14 days. Not True. Misconception #3: all tests have to be shut-in >14 days. Not True. In most cases, with a minimum eight hours (8 h) of subsurface transient pressure data, it doesn’t matter whether-or-not the...

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