Table 1 Summary of tracer injection and production during Tests 8 and 9

Test start

22.11.2017

13.12.2017

Hot water injection

29.11.2017–10.01.2018

Test end

29.12.2017

20.12.2017

Injection interval

INJ2-int4

Injection depth (m)

22.89–23.89

Injection flow rate, \(Q_{{\text {inj}}}\) (L min\(^{-1}\))

2.1

1.8

Injection pressure, \(P_{{\text {inj}}}\) (kPa)

374

450

Injection temperature, \(T_{J}\) (\(\,^{\circ } \text {C}\))

13

45

Tracer

Eosine

Injected tracer mass, \(M_{{\text {inj}}}\) (mg)

19.5

19.0

Injected tracer volume, \(V_{{\text {inj}}}\) (L)

0.975

0.950

Monitoring locations

AU Tunnel, PRP1-int3

PRP2-int2, PRP1-int2

Production flow rate, \(Q_{{\text {pro}}}\, (\text {L min}^{-1})\)

1^a, 0.090

0.85^a, 0.051

0.069, 0.12

0.043, 0.12

Distance to monitoring location (m)

20.7, 4.6, 6.4, 8.6