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1
Snohvit C02 Tubaen Fm. storage capacity and inj«ction strategy study
Valid from
Rev. no. 1.0
4 Modelling and interpretations
4.1 Flowing and shut-in pressures, MEG washes
Short shut-ins have been done every week sińce autumn 2008. These are typically of 3 minutes duration, and the flowing vs. non-flowing pressures has been compared. Rapid temperaturę increase in the well after shut-in cause CO? density to decrease, which again reduces static weight of the column and increase the pressure seen by the downhole gauge. This complicates any longer duration shut-in measurements. Bottom hole shut-in pressures and bottom hole flowing pressures have been estimated by assuming a similar weight of the CO; column between the gauge and the perforations as between the wellhead and downhole gauges. The calculated CO; density has mostly been between 0,90 and 0,96 kg/m\ with a tendency to increase with time. The generał pressure increase and lower levels of impurities in the CO; contribute to this.
O
The calculated shut-in pressures are shown in Figurę 66
368
358
348
<U 338 -O
328
Z 318
308
|
r | ||||||||
|
1 |
■>■ 1 1 ........................ |
■ ■ ■ ■ |
500000 400 000 300 000 200000 100000
288
17.4.2008 17.7.2008 16.10.2008 15.1.2009 17.4 2009 17 7 2009 16 10 2009 16.1.2010 17 4 2010
800 000
Datę
Figurę 66: Estimated bottom-hole shut-in pressures as function of calendartime (blue dots). Cumulative injected volume is shown as grey linę.
The difference between flowing and shut-in pressure is shown in Figurę 67 (blue dots). For most of the time it has been between 6 and 10 bar. The injectivity index (injection ratę divided by pressure difference) has shown a slight decreasing trend, and has lately been in the order 6-9 tons/hr/bar].
Classification: Intemal Status: Draft Expiry datę: 2012-12-31 Page 75 of 132
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