Rig: Ocean General

Name Ocean General
Owner Diamond Offshore Drilling
Manager Diamond Offshore Drilling
Rig Type Semisub
Sub Type Midwater Floater
Jackup Type --
Max Water Depth (ft) 3000
Max Drill Depth (ft) 25000
Dimensions (ft) 290 x 217 x 95
Leg Length (ft) --
Competitive Yes

Current Location

Country --
Region --

Drilling Equipment

Drawworks Type National Oilwell Varco E-3000
Drawworks HP 4000
Mud Pumps Type National Oilwell Varco A-1700-PT Triplex
Top Drive National Oilwell Varco TDS-4S
Hookload Capacity (lbs) 1000000

Rig Construction Details

Rig Design Korkut
Rig Model New Era
Year Built 1976
Country of Build USA
Yard Name Alabama Shipyard
Group Yard Name Alabama Dry Dock & Shipbuilding

Rig Contract Details

Operating Status Retired
Operator

News

18 Aug 2014

Salamander fails to find commercial discovery at North Kendang-2

Salamander Energy plc announces that drilling operations on the North Kendang-2 exploration well (NK-2) in its operated South East Sangatta PSC have now been concluded. The well reached a total depth of 2,569 metres true vertical depth sub-sea and encountered two hydrocarbon bearing intervals, one of which was the primary objective zone of high pressure encountered in the North Kendang-1 (NK-1) well. This was successfully penetrated in NK-2 and comprised a 2.5m gas condensate bearing sand. In addition, a 10.5m gas bearing sand with oil shows was encountered at a shallower depth. This sand is at the same stratigraphic interval that flowed 6,000 bopd on test in the South Kecapi-1 DIR/ST well in the Bontang PSC. The volume of hydrocarbons encountered is considered to be sub-commercial and the NK-2 well has been plugged and abandoned. Costs related to the NK-1 well control incident, and to drilling the NK-2 well to this same depth, are covered under the Company’s insurance policies. This well concluded Salamander’s drilling programme in the North Kutei and the ‘Ocean General’ rig has now been released.

2 Jul 2014

Salamander spuds North Kendang-2

Salamander announces the spud of the North Kendang-2 exploration well (NK-2), a re-drill of the North Kendang-1 (NK-1) well in the South East Sangatta PSC. Salamander has a 75% operated interest in the South East Sangatta PSC. NK-2 will be drilled to a depth of approximately 2,878 m total vertical depth sub-sea (TVDSS) in order to evaluate the Upper Miocene section. The ‘Ocean General’ semi-submersible rig owned by Diamond Drilling, which has now been fitted with managed pressure drilling equipment to enable it to manage the anticipated pressure regime, will be used to drill the NK-2 well. NK-1 was drilled to 2,535 m TVDSS when it encountered a high pressure wet gas kick in the Upper Miocene, which led to it being plugged and abandoned on 13th April 2013. Costs related to the NK-1 well control incident, and to drilling the NK-2 well to this same depth, are covered under the Company’s insurance policies.

28 Apr 2014

Premier strikes oil at Kuda Laut

Premier Oil (Premier) today announced that company’s Kuda Laut-1 exploration well in Tuna PSC (Premier operator, 65%) offshore Indonesia has discovered 183 feet of net oil-bearing reservoir and 327 feet of net gas-bearing reservoir. Oil and gas samples have been recovered to surface. Following completion of evaluation operations, the well will be side-tracked to drill the Singa Laut prospect in the adjacent fault block. The results of this side-track are expected in late May and will be incorporated with the results from Kuda Laut to assess the extent of discovered resources at that time. Premier spudded the Kuda Laut-1 well using Diamond Offshore’s ‘Ocean General’ semisub, which will now drill the well at the Singa Laut prospect. Separately, drilling continues at the Ratu Gajah-1 exploration well in the Natuna Sea Block A PSC (Premier operator, 28.67%) with results expected in May.

17 Mar 2014

'Ocean General' completes Vietnam drilling

Pan Pacific Petroleum (Vietnam) Pty Ltd has been advised by the Operator of the Block 07/03 Production Sharing Contract that the plugging and abandonment of the 07/03-CD- 1X exploration well drilled using the 'Ocean General' drilling rig has been completed and the rig has been released.

3 Mar 2014

'Ocean General' drills duster in Vietnam

Pan Pacific Petroleum (Vietnam) Pty Ltd has been advised by the Operator of the Block 07/03 Production Sharing Contract, Premier Oil Vietnam South, that 07/03-CD-1X, the Silver Sillago exploration well being drilled by 'Ocean General' drilling rig has reached a measured depth of 3537m BRT (below rotary table) without encountering oil or gas and TD (total depth) has been declared at this depth. The well, which evaluated a tilted fault trap similar to the Cá R?ng Ð? (CRD) structure, encountered sandstones in the main objective sequence as prognosed, but no hydrocarbons were present. Preparations will now be made to plug and abandoned the well as planned.

23 May 2013

Bedug-1 Gas Discovery

Salamander announces that the Bedug-1 exploration well in the Bontang PSC has been concluded as a gas discovery[i]. Bedug-1 was drilled using the Ocean General semi-submersible rig, the well reaching a total depth (“TD”) of 1,693 m true vertical depth sub-sea (“TVDSS”). The well encountered a gas-bearing sandstone interval of 5m thickness in the Lower Pliocene BT40 primary target as confirmed by log data. Within the BT45 primary target, the interval of well-developed sandstones from which oil was tested at South Kecapi were found to have thinned out on the crest of the Bedug structure. However, with these thinner sandstones containing strong oil shows, the potential for a commercial oil discovery remains and further investigation of the up-dip extent of the South Kecapi oil discovery is warranted. After deepening the well into the top of the BT50 target interval, Bedug-1 experienced a high pressure kick that came from a severely over-pressured 5.5m thick sandstone. Both log and pressure data have demonstrated this reservoir to be gas bearing, with log data from additional underlying thinner bedded sandstones also interpreted to be hydrocarbon-bearing. However, due to increasing formation pressures the well had to be suspended before fully evaluating the BT50 interval and without reaching the BT65 and BT80 targets. Based on the pressure profile in the well it was concluded that the deeper objectives could not be drilled and evaluated safely with the equipment available on the rig. This also precluded the drilling of a side-track down-dip to further evaluate the oil bearing BT45 interval. Completion of the Bedug-1 well concludes the current phase of Salamander’s multi-well programme in the North Kutei basin. This campaign has yielded the South Kecapi oil and gas discovery; the Bedug gas discovery; and wet gas at North Kendang which experienced a high pressure kick. Work is on-going to evaluate the commercial potential of the discoveries made to date, and Salamander intends to re-drill the North Kendang well (which, as announced on 22 May, is subject to an insurance claim). In parallel, new well data is to be integrated into a technical assessment of the Bontang and Southeast Sangatta PSCs, which both retain a significant undrilled inventory of prospects.

16 Apr 2013

Spud of Bedug-1 Exploration Well

Salamander announces the spud of the Bedug-1 exploration well in the Bontang PSC. Salamander has a 100% operated interest in the Bontang PSC. The Bedug-1 well will be drilled to a depth of approximately 2,050 m total vertical depth sub-sea ('TVDSS') and is targeting gas and oil pay in both Upper Miocene and Lower Pliocene channel sands on the crest of the Bedug structure. The well is located to the East of the Angklung-1 gas discovery and 4 km East and 500m up-dip of the recent South Kecapi-1 ST oil and gas discovery. Bedug-1 will be drilled by the Ocean General semi-submersible rig in a water depth of 460 metres.

11 Apr 2013

North Kendang-1 Exploration Well Suspended

Salamander Energy plc announces that the North Kendang-1 exploration well ("NK-1") in its operated South East Sangatta PSC has been suspended as a potential gas discovery. The rig is now being mobilised to the Bontang PSC to drill the Bedug-1 exploration well, the third well in Salamander’s multi-well programme in the North Kutei basin. The Ocean General semi-submersible rig spudded the NK-1 well on the 10th February 2013; to date the well has been drilled to 2,535 metres true vertical depth subsea ("TVDSS"). The well drilled through a predominantly shale-prone section throughout the Pliocene. On reaching what is prognosed to be the first Upper Miocene reservoir target at 2,533 metres TVDSS, the well took a significant kick from an influx of high pressure hydrocarbon gas into the well bore at a wellhead pressure of circa 4,000 psi. As a result of encountering high pressure gas, the well experienced operational challenges ultimately leading to its suspension before evaluating the reservoir section. The gas has been sampled and is being analysed with initial results pointing to a wet gas, while pressure data indicate a potentially significant column height. Salamander is reviewing the option to return to NK-1 as part of the current drilling campaign, in order to drill ahead and evaluate the Upper Miocene section. NK-1 is the second well in Salamander’s multi-well programme in the North Kutei basin and follows on from the oil and gas discovery at the South Kecapi-1 well announced in February.

13 Feb 2013

Spud of North Kendang-1 Exploration Well

Salamander announces the spud of the North Kendang-1 exploration well in the South East Sangatta PSC. Salamander has a 75% operated interest in the South East Sangatta PSC. The North Kendang-1 well will be drilled to a depth of approximately 2,600 m total vertical depth sub-sea ('TVDSS'). The North Kendang-1 well is targeting gas and oil pay in a series of stacked Pliocene – Upper Miocene sandstone reservoirs. The combined mean pre-drill estimate of prospective recoverable resources is approximately 770 Bcf and 91 MMbo. The well will be drilled by the Ocean General semi-submersible rig in a water depth of 465 metres. On completion of the North Kendang well the rig will return to the Bontang PSC to drill the Bedug prospect. The Bedug location is 4 km east and 500 m up-dip of the recent South Kecapi oil and gas discovery.

4 Feb 2013

South Kecapi-1 Oil and Gas Discovery

Salamander Energy plc announces that the South Kecapi-1 DIR/ST exploration well (“SK-1”) in the Bontang PSC has been completed as an oil and gas discovery. South Kecapi is the first well in Salamander’s multi-well programme in the North Kutei basin. SK-1 discovered a combined 40 m of net oil and gas pay in high quality stacked Pliocene channel sandstones. A drill stem test (“DST”) was conducted within one of the well’s primary targets; a well-developed, Pliocene-age channel sandstone, which flowed light oil at a rate of c. 6,000 barrels of oil per day (constrained by testing equipment) and 8 MMscf per day of gas. The well is being plugged and abandoned as an oil and gas discovery. SK-1 was drilled using the Ocean General semi-submersible rig, reaching a total depth (“TD”) of 2,102 m true vertical depth sub-sea (“TVDSS”). Higher pressures than anticipated and numerous gas kicks were encountered throughout the early Pliocene section which is believed to be indicative of a hydrocarbon-charging system that is extremely active.

10 Dec 2012

Spud South Kecapi-1 Exploration Well

Salamander announces the commencement of its exploration drilling programme in the North Kutei basin, East Kalimantan, Indonesia with the spudding of the South Kecapi-1 DIR and DIRA exploration wells in the Bontang PSC. Salamander has a 100% operated interest in the Bontang PSC. The South Kecapi-1 DIR well will be drilled to a depth of approximately 2,450 metres total vertical depth sub sea (‘TVDSS’). On completion it will then be sidetracked approximately 1.5 km to the west with the South Kecapi-1 DIRA being drilled to a depth of approximately 2,100 metres TVDSS. The South Kecapi-1 DIR/DIRA wells are targeting gas and oil pay in a series of stacked Pliocene – Upper Miocene sandstone reservoirs. The combined mean pre-drill estimate of prospective recoverable resources is approximately 275 Bcf and 20 MMbo. The wells will be drilled by the Ocean General semi-submersible rig in a water depth of 388 metres. On completion of the South Kecapi-1 DIR/DIRA wells the rig will move to the South East Sangatta PSC to test the North Kendang prospect.

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