88 Energy Limited - Operations Update
· Nitrogen lift continues at Icewine#2
Project Icewine - Icewine#2 Production Testing
As at 1730 21st June (AK time), the flowback rate was 50 barrels of water per day on a variable choke setting (currently 36/64"). Wellhead pressure has been managed lower to 75psi to reduce back pressure in the system.
Since the last update on the 18th June, adjustments were made to the flowback system to determine the optimal settings for the nitrogen lift operation. Consequently, flowback rates fluctuated between an average rate of 50 barrels of water per day to 120 barrels of water per day. The percentage of hydrocarbon gas in the flowback dropped to 5% at one stage due to an increased nitrogen injection rate, 300 scf/m, which is deemed to have limited the flowback of both water and gas from the borehole. The reduction in productivity is attributed to an effective downhole choke created between the 4.5" annulus and the 1.75" velocity string, limiting the flowback when the nitrogen rate is too high. The nitrogen injection rate is now being reduced back to 150 scf/m and should result in an increase in flowback of water and gas from the borehole.
During this period there has been no meaningful change to the composition of the returned gas and fluid. Flowback is considered to be 100% stimulation fluid and gas.
Hydrocarbon gas content continues to be predominantly methane (90%) with some heavier elements up to trace C6+. The composition and rate is as expected for this stage of the flowback and results are considered unrepresentative of the hydrocarbon composition in the reservoir, as the well is still in clean-up phase. Salinity measurements of the flowback fluid are also not indicative of connectivity to the reservoir, as expected at this stage of clean-up.
Total clean up fluid returned, (net of diesel for freeze protection and any other fluids introduced as part of the current operation), since commencement of flowback on 12th
Icewine#2 Production Testing - Timeline
The Icewine#2 well is located on the
Prior to Winter shut-in (2017) 20% of the stimulation fluids had been flowed back versus a projected minimum target of 30% to gain connectivity to the source rock reservoir.
Flowback re-commenced, on schedule, at 22:30 11th
A production log was run on 12th June and confirmed that all perforations were contributing to flow. As per the flowback design, nitrogen was then introduced gradually to the wellbore from 0845 13th June (AK time), prior to installation of the coiled tube velocity string, to artificially lift stimulation fluids in order to gain connectivity to the reservoir. The flowback rate stabilised at 200 barrels of water per day through an 8/64" choke and then steadily declined to circa 100 barrels of water per day, as per expectation.
Flowback was interrupted, as per the program, on the 15th June 08:00 (AK time) to allow installation of the velocity string. Flow was re-established on 15th June at 20:00 (AK time) with nitrogen introduced into the annulus between the 4.5" casing and the 1.75" velocity string. After displacement of fluid in the annulus, the flowback rate stabilised at 350bpwd through a variable choke to maintain a target wellhead pressure of 200-400psi. This technique decreases the backside pressure in the system and optimises lifting of fluid from the wellbore.
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Pursuant to the requirements of the
Project Icewine Overview
The Project is located on an all year operational access road with both conventional and unconventional oil potential. The primary term for the State leases is 10 years with no mandatory relinquishment and a low 16.5% royalty.
The HRZ liquids-rich resource play has been successfully evaluated based on core obtained in the recently completed (
Significant conventional prospectivity has also been identified on recently acquired 2D seismic across the project acreage.
Cautionary Statement: The estimated quantities of petroleum that may be potentially recovered by the application of a future development project relate to undiscovered accumulations. These estimates have both an associated risk of discovery and a risk of development. Further exploration, appraisal and evaluation are required to determine the existence of a significant quantity of potentially movable hydrocarbons.
Exploration incentives provided by the State of Alaska with up to 35% of net operating loss refundable in cash were concluded for all expenditure post
The primary objective is an untested, unconventional liquids-rich shale play in a prolific source rock, the HRZ shale (Brookian Sequence), that co-sourced the largest oil field in North America; the giant
Recently acquired 2D seismic has identified large conventional leads at Project Icewine within the same Brookian petroleum system and shallow to the HRZ shale, including potential high porosity channel and turbiditic sands associated with slope apron and deepwater fan plays. The Brookian conventional play is proven on the North Slope; the USGS (2013) estimated the remaining oil potential to be 2.1 billion barrels within the Brookian sequence. Two recent discoveries in the Brookian have already exceeded these estimates, with Armstrong/Repsol discovering 1.4 billion barrels in 2015 and Caelus announcing a 2.5 billion barrel discovery in 2016. Additional conventional potential exists in the Brookian delta topset play, deeper Kuparuk sands and the Ivishak Formation.
A Prospective Resources Report by DeGolyer and MacNaughton, was commissioned by 88 Energy to evaluate the unconventional resource potential of Project Icewine in
About 88 Energy: 88 Energy has a 63% working interest and operatorship in ~342,000 acres onshore the prolific North Slope of Alaska ("Project Icewine"). Gross contiguous acreage position for the Joint Venture is ~475,000 acres (88E 301,000 net acres). The North Slope is the host to the 15 billion barrel
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