COMPOSITIONAL DATA : GAS : GAS PROPERTIES Puffin Fm RFT ...

RFT 4, 1,392 m,Recovered 6.5 litres of oil, 500 cc ofwater and 0.4 m 3 of gas.RFT 2, 1,407.5 m,Recovered 6 litres of oil, 3 litres ofwater and 0.6 m 3 of gas.RFT 1, 1,417.8 m,Recovered 1.2 litres of oil, 12.3 litresof water and 0.04 m 3 of gas.Challis FormationChallis FormationChallis FormationAPPRAISAL AND DEVELOPMENT DRILLING :Challis-2 was abandoned due to mechanical difficulties.Challis-2A intersected good quality oil saturated sandstones between 1,371.8 mSS and 1,409.8 mSS.The 25 m of net pay is divided into two intervals , separated by a 13 m shale break.Challis-3 intersected two sands within a 36 m gross oil column (1,333.5 mSS to 1,379 mSS and 1,408mSS to 1,416 mSS). Residual oil fluorescence was noted down to 1,420 mSS.Challis-4 intersected a 22.7 m gross oil column (19 m net pay) between 1,384.8 mSS and 1,407.7 mSS.Challis-5 was plugged and abandoned. The prognosed structural high at the Challis-5 location was notpresent. The time pull-up observed around Challis-5 is thought to have resulted from fast Palaeoceneinterval velocities.Challis-6 intersected a 47.5 m gross oil column (18 m net pay) between 1,363 mSS and 1,410.5 mSS.Challis-7 intersected a 64.5 m gross oil column (29 m net pay) between 1,346 mSS and 1,410.5 mSS.Challis-8 intersected a 77.5 m gross oil column (36 m net pay) between 1,335 mSS and 1,412.5 mSSand was completed as a Pollard Formation oil producer. The well was plugged and abandoned in 1991after the drilling of Challis-9, which was drilled in the same fault compartment and updip of Challis-8.Challis-9 intersected a 44.7 m gross oil column between 1,363 mSS and 1,407.7 mSS and wascompleted as Pollard Formation oil producer.Challis-10 was planned as a water injector. However a sealing fault between the Challis-2A and Challis-10 locations precluded this. Challis-10 was cased and suspended as an oil producer after intersecting a28.1 m gross vertical oil column (10.2 m net pay).Challis-11 was plugged and abandoned after intersecting the reservoir below the oil/water contact. Twosidetracks were drilled to the southeast and northwest to determine the lateral extent of the Challis Horst,but both were plugged and abandoned dry.Challis-12 was plugged and abandoned dry.Challis-13 was plugged and abandoned dry after recovering non-commercial quantities of oil.Challis-14 was designed as a new drainage location for the northeastern portion of the Challis Horst.