In the Sakhalin Island, the oil show was discovered near Okha city in 1880. Hokushinkai (Japanese company) developed this oil and imported it into Japan in 1924. Japanese North Sakhalin Oil Co., Ltd. succeeded the business of Hokushinkai and continued until 1943.
56 Japanese died during 1923-1943 years and were buried in Okha. After 1943, none of the Japanese visited the Japanese grave of Okha.
In 1975, Sakhalin Oil Development Cooperation Co., Ltd (old SODECO) made the agreement (G/A) with the USSR to explore the shelf of the Sakhalin Island.
In the north-east shelf area, the Odoptu and Chayvo oil/gas fields were discovered. These oil/gas fields and the Arkutun/Dagi oil/gas field developed as Sakhalin-1 project. And the Luni structure and the Piltun/Astokh structure developed as Sakhalin-2 project.
The author worked in Sakhalin in times of the Japan and Soviet co-operational exploration based on G/A. But the foreigners who worked in Sakhalin were not able to be accompanied by a family in the Sakhalin.
In 2009, he guided his wife and visited Sakhalin, and she enjoyed sight seeing of the place that he worked in old days. And he recognized the present circumstances of the Sakhalin and difference with that of the USSR era.
Another purpose of his visit to the Sakhalin was to burn incense for the 56 Japanese deceased in Okha. But the graveyard was removed, and he recited the sutra from the hill which overlooked the lost grave.

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The Sakhalin 1 Project is one of the oil and gas development projects located on the northeast shelf of Sakhalin Island, water depth is 10 to 60 meters and the thick ice covers the area 6 to 7 months a year. The project was declared commercial by the Sakhalin 1 consortium in October, 2001, and started development period from this year. Total recoverable reserves are estimated at 307 million tons of oil and 485 billion cubic meters of natural gas. This project consists of three fields, Chayvo, Odoptu and Arkutun-Dagi, which are planned and conducted to develop in phases 1 to 4, using both offshore and onshore wells.
Many of these wells will be drilled using a new drilling technique called ERD (extended reach drilling), which allows oil and gas targets to be drilled by the rig located a great distance away.
The first phase of development is focusing on the oil production of Chayvo and Odoptu fields, and the start of the oil production from Chayvo field was commenced in October 2005.
The oil production reached to 250 Kbpd at peak rate in 2007. The produced oil is transported through the pipeline to the marine tanker terminal at Dekastri Located Khabarovsk province. Large marine tankers are escorted by icebreakers during winter season using a new developed ice passport concept for the year-round export operations.
These advanced technologies were applied to reduce the overall cost of development and to minimize environmental impact.

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The Sakhalin 1 Project is one of the oil and gas development projects located on the northeast shelf of Sakhalin Island, water depth is 10 to 60 meters and the thick ice covers the area 6 to 7 months a year. The project was declared commercial by the Sakhalin 1 consortium in October, 2001, and started development period from 2002. Total recoverable reserves are estimated at 307 million tons of oil and 485 billion cubic meters of natural gas. This project consists of three fields, Chayvo, Odoptu and Arkutun-Dagi, which are currently planned to develop in phases 1 to 4, using both offshore and onshore wells. Many of these wells will be drilled using a new drilling technique called ERD (extended reach drilling), which allows oil and gas targets to be drilled by the rig located a great distance away. The first phase of development is focusing on the oil production of Chayvo and Odoptu fields, and the start of the oil production from Chayvo field is scheduled at the end of 2005.
The oil will be transported through the pipeline to the marine tanker terminal at DeKastri. Large marine tankers will be escorted by icebreakers using a new developed ice passport concept, which would confirm the safety and reliability of plans for the year-round export operations.
These advanced technologies will be applied significantly to reduce the overall cost of development and to minimize environmental impact.

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