Hummer Development Project, Gulf of Mexico, United States of America
The Hummer development project lies in the three outer continental shelf lease blocks Main Pass 270/273/274 of the Gulf of Mexico, approximately 80km south-east of the Mississippi river delta. Discovered in 2015, the gas and condensate field lies in a water depth of 215ft (65m).
The project is jointly owned by Petsec Energy (12.5%) and other private investors (87.5%), including Castex Offshore, which is serving as the operator of the project.
First production from the field is expected in the second quarter of 2017.
Hummer field geology and reserves
The Hummer field reservoir is an up-thrown fault closure containing Big Hum and Cris I sand sections of the Middle Miocene age.
The field is estimated to contain gross mean reserves of 59 billion cubic feet of gas and 1.2 million barrels of condensate. Upside reserve potential of the field is estimated to be 183 billion cubic feet of gas and 3.7 million barrels of condensate.
Exploration and appraisal of Hummer
The field was discovered with the drilling of an exploration well in the Main Pass 270 block between June and December 2015. The well was drilled to a depth of 4,812m by the Ensco 87 jack-up drilling rig and encountered 129ft of oil and gas pay. The well was cased and mud line was suspended.
Field development and infrastructure
The Hummer field is planned to be developed through a four pile platform jacket, which will be installed in water depths of 215ft and include three slots. Fabrication and installation of the platform is estimated to cost $1.1m.
The platform was installed in September 2016. The Ensco 87 jack-up drilling rig arrived on location in November 2016 to tie back the discovery well to the platform. The well was then completed and tested for a 48h flow back period.
The well flowed at the rate of 19.88 million cubic feet of gas a day and 396 barrels of condensate a day with no formation water. Results from the tests conducted on the discovery well will help in the design and engineering of the platform topsides, flowlines and pipelines.
Well logs indicated the presence of additional reserves, which require further drilling and tests. Additional appraisal drilling will be undertaken in 2017 and 2018 to test the Cris I sand sections for potential oil.
Production is initially expected to commence from the Big Hum sand sections. A total of three to nine development wells are planned to be drilled during 2017-2019. One well is scheduled to be drilled in 2017.
Ensco 87 jack-up drilling rig details
Ensco 87 is a self-elevated MODU jack-up drilling rig built in 1982. It is 243ft in length, 200ft in breadth, and can operate in water depths between 22ft and 350ft.
The rig is equipped with drilling equipment including a National derrick rig measuring 160ft x 30ft x 30ft, National E-3000 drawworks, National C-375 rotary table and a Varco TDS-8 top drive. The hoisting system of the rig can handle 750 short tonnes (sT).
The rig is also equipped with three National 12-P-160 triplex mud pumps and a Marathon Le Tourneau AC electric jacking system. One Marathon LeTourneau PCM 120 AS electric crane with lifting capacity of 50sT and two Marathon LeTourneau PCM 120 AS electric cranes with lifting capacity of 45sT are also part of the rig.
Storage capacities of the rig include 7,531 barrels of fuel oil, 9,727 barrels of drill water and 1,689 barrels of liquid mud.