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Figure Above: Temperatures from DH5R, pressures from DH5R and DH7a and injection rates from 
DH7a.

Figure Above: Match of the entire DH7a data set with the uniform-flux frac-
ture and sealing boundary.

Figure Above: Injection rate and volume forecasts from the falloff model 
with an operating pressure of 130 bar.

The picture above is showing the gas flow 
rate equipment hooked up and in operation.

DH7A and DH5R testing of the Knorringfjellet FormationM

DH7a and DH5R in the Adventdalen Well Park were tested in the Knorringfjellet formation of late Triassic age at a 
depth of 670-700 m with an active injection and falloff sequence in DH7a and interference monitored in DH5R at a 
distance of 94 m. The test sequence started September 6, 2012 and consisted of three short injection periods with 
falloffs and one 3-day injection period at a rate of 450 m3/d that ended September 15. This sequence was followed by 
an extended falloff lasting 7432 hours from September 15, 2012 until July 22, 2013.

The interference test was negative in the sense that an interference response could not be identified in DH5R. Since 
the DH7a data are consistent with effects of a nearby boundary and the radius of investigated early in the DH7a ex-
tended falloff reached beyond the distance to DH5R, there has to be a flow barrier with low or no leakage between 
the two wells. For the DH7a data this barrier has been modelled both as a sealing and as a low-leakage fault.

The following points summarize key observations and results from the DH7a and DH5R data:

• The formation is under-pressured by at least 35 bar with the sea level as reference with pressure 27.5 bar at the 

gauge (645 m), corresponding to 29.9 bar at 670 m. A slightly lower pressure is possible in DH5R, but the differ-
ence might be caused by different fluid densities in the two wellbores

• DH7a was clearly hydraulically fractured from the injection
• Under the assumption of hemi-radial flow and thickness 24 m, a permeability of 2.55 md is obtained from the 

DH7a data with fairly high confidence

• The DH7a data can be matched with a fracture half-length of 83 m and a parallel sealing boundary at 58 m, but the 

distance to the boundary can be less with another fracture type (same half-length)

• The radius of investigation is 1444 m in the open direction after 7432 hours

Injection forecasts covering 1E5 hours (11.4 years) give essentially the same result for different realistic scenarios, 
with rates dropping below 60 m3/d after about two years and below 40 m3/d after 6 years. Total volume after 11.4 
years is 180000 m3. The data were generated with a bottom-hole pressure of 130 bar and a formation pressure of 28 
bar.