Offshore gas field development
The Karish and Tanin natural gas fields are located in the Levant Basin of the Mediterranean Sea, offshore Israel. Both fields are owned by Energean Oil & Gas’s subsidiary Energean Israel.
The two fields were discovered by Noble Energy and acquired by Energean Oil and Gas in December 2016.
They are being jointly developed under a deepwater gas development project, which is estimated to cost between $1.3bn and $1.5bn.
The field development plan (FDP) for the project was submitted in June 2017 and subsequently approved by the Israeli Petroleum Commissioner in August 2017.
First gas from the deepwater gas development project is expected in 2021.
The fields are expected to jointly supply an estimated 88 billion cubic metres of natural gas and 44 million barrels of liquids to the regional Israeli market, as well as international markets.
The Tanin field lies in the Alon A licence 13 miles (21km) to the north-west of the Tamar field in 5,100ft of water.
It was discovered in February 2012 by the Tanin discovery well, which was drilled at a depth of 18,212ft.
The well encountered 130ft of net gas pay in the high-quality lower Miocene sands.
The Karish field lies in the Alon C license 20 miles (32km) to the north-east of the Tamar field in 5,700ft of water.
It was discovered in May 2013 by the Karish discovery well, which was drilled to a depth of 15,783ft by the Ensco 5006 rig.
The well encountered 184ft of net gas pay in the high-quality lower Miocene sands.
The combined reserves of the Karish and Tanin discoveries are approximately 2.7 trillion cubic feet (tcf) of natural gas and 41 million barrels of oil equivalent (Mboe) of light hydrocarbon liquids.
The fields’ total 2C contingent gas resources are estimated at 531Mboe.
The Karish area development plan involves the drilling of three wells, while six wells are planned to be drilled at the Tanin field.
All the wells are set to be tied back to a floating production storage and offloading (FPSO) unit that will be installed at the Karish field.
The wells will be drilled using a DP Class 3 ultra-deepwater vessel known as the Stena Forth drillship, which is owned by Stena Drilling.
The drillship is slated to be mobilised to the Karish and Tanin development fields’ location in order to drill three wells in the first quarter of 2019.
The Karish and Tanin FPSO will be a spread moored vessel and is planned to be installed approximately 90km from shore. It will have a 227m-long and 50m-wide hull.
The total oil storage capacity of the FPSO will be 800,000 barrels and the total gas production capacity will be eight billion cubic metres of gas per annum.
The FPSO is intended to enable the recovery of hydrocarbons with minimal impact on the environment.
The FPSO is also expected to process, store and offload light oil without the need for onshore installations.
It will be dispatched to the field by 2020 and is expected to cost approximately $500m.
The gas produced by the deepwater project will be shipped from the FPSO via a 90km pipeline to a landfall at Dor before being supplied to the Israeli natural gas transmission system.
TechnipFMC was awarded the front-end engineering and design (FEED) contract for the Karish and Tanin fields. The company was further awarded the engineering, procurement, construction and installation contract for the subsea system, offshore and onshore pipeline system, and valve station of the field. The scope of contract also includes design of a FPSO for tie-back of the Tanin field.
Stena Drilling was contracted by Energean Israel to provide the Stena Forth drillship to conduct the drilling activities.
Sembcorp Marine Rigs & Floaters, a subsidiary of Sembcorp Marine, was sub-contracted by Technip to undertake the engineering, procurement and construction works for the hull and living quarters of the FPSO. The scope of the contract also includes fabrication and integration of the topside modules and installation of owner-furnished equipment.
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