Territory Stories

Ipolera roads bores, bore completion report rn 16879,16880 & 16881.

Details:

Title

Ipolera roads bores, bore completion report rn 16879,16880 & 16881.

Creator

Paul, R.

Collection

E-Publications; ebooks; PublicationNT; E-Books; Report No 78/96

Date

1997

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:1997

Language

English

Series

Report No 78/96

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/228899

Citation address

https://hdl.handle.net/10070/673599

Page content

Technical Report WRD96078 Viewed at 15:07:17 on 29/07/2010 Page 28 of 49. I I I I I I I I I I I I I I I The transmissivity is low in both bores because the aquifer is fractured Ljiltera Member and, from the driller's log, there are fractures in 5.3 m of drilling in Ri'! 16880 and in 1.9 m of driliing in RN 16881. B3. BORE EFFICIENCY The Step test has been used to calculate the efficiency of the bore. The drawdown in a pumping bore is made up of two components, aquifer loss and well loss (Clark, 1977). The aquifer loss is that part of the drawdown caused by resistance to laminar flow within the aquifer. The well loss results from resistance to turbulent flow in the zone adjacent to the bore, and through the screen or slotted casing. The relationship between the components is given by the formula s=BQ + CQ2 , where BQ = aquifer loss and CQ2 = well loss. The well efficiency is calculated from BQ!(BQ + CQ2) x 100 and is in Table B3. T bl B~ a e ~. B Effi' I I B ore ~ clency, IpO era ores RN 16880 I I I I B=O.064835 C=0.000042034 Calculated from Hantush Bierschenk method. Q I Q Drawdownl BQ 1 CQ" I Calculated Bore Efficiency % (Us) (mo/day) (lOO mins)1 (m) I (m) I Drawdown I 2.05 177.1 12.731 12.721 1.321 12.801 89.7 3.01 259.21 19.611 19.811 2.821 19.63 85.6 4.5 388.8 31.591 31.481 6.35 31.56 79.9 6.01 518.41 47.261 44.891 11.30 44.91 74.8 RN 16881 I I 1 1 B=O.26988 C=O.OO034323 Calculated from Hantush-Bierschenk method. Q 1 Q Drawdownl BQ 1 CQ" Calculated Well Efficiency % (Us) I (mo/day) (100 mins) 1 (m) (m) Drawdown 0.71 60.5 16.631 16.63 1.26 17.58 92.9 0.91 77.8 22.221 20.991 2.08 23.06 91.0 1.1 95.0 27.761 25.651 3.10 28.75 89.2 1.31 112.3 33.381 30.311 4 ~~ .~~ 34.64 87.5 I The bores show average bore efficiency for oxy slotted casing. Bore Ri'! 16881 shows slightly better bore efficiency than RN 16880 but is being pumped at lower rates than Ri'\i 16880. I I I I References: Clad;:. L. 1977. The analysis and planning of step drawdown tests. Quart. J. Engng. GeoL VoL 10, pp. 125-143 B2