Impact of Frac Injection Volume and Rate on Performance - A Montney Case Study

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On September 16, 2019, Erfan Sarvaramini conducted a keynote speech at the 4th annual Canadian Shale Water Management 2019 conference, entitled “Impact of Frac Injection Volume and Rate on Performance - A Montney Case Study.” (view PDF)

In this talk, Erfan presented a geomechanical model of multistage hydraulic fracturing in the Montney Formation. This model was built based on microseismic data (Figure 1), bottom hole pressure, and geomechanical and geological parameters.

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Figure 1. Montney Case Study: Model set-up and microseismic image

 

This case study was used to analyze the impact of frac injection volume and rate on the instantaneous production rate, cumulative production, and EUR. The simulation study shows that the frac pumping rate and total injected volume did not have a major impact on the ultimate recoveries. However, the frac pumping rate can significantly accelerate the instantaneous production rate, at least during the early life of the stimulated reservoir, as illustrated in Figure 2.

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Figure 2. Calendar rate and cumulative production rate in the simulation study in Montney formation.

 

The result of this study was validated using two groups of wells in Montney Alberta (AB) and Montney BC. In Montney AB, 110 horizontal wells are used to build an average type curve grouped by pumping rate, total injected volume, and proppant intensity. Surprisingly, total injected volume and proppant intensity didn’t seem to significantly impact the production rate and EUR (after exceeding a certain threshold). However, the frac pumping rate considerably modified the production rate, particularly during the first 16 months of production (Figure 3).

 

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Figure 3. Impact of rate and total injected volume on production in the case study in Montney AB.

 

The results of the second well group study in Montney BC also agree with simulation results. The pumping rate still shows a drastic change in production rate persisting for an extended period (>48 months). Total injected volume and proppant seem to have only minor impacts on overall frac performance.

 

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Figure 4. Impact of rate and total injected volume on production in the case study in Montney BC.

 

The full presentation of this talk is included here.