จากการเปิดสัมปทานที่ผ่านมา 20 ครั้ง

From the opening over the past 20 concession the concession at a time, and then count the number of Edition and 108 155 to 53 67 2555 (2012) year concession conversion has only just made the concession because some of the petroleum exploration of the sources could not be found. Concession recipient must provide concession areas return State. Investments in the survey did not find it wasteland. But the State also has a concession from the Government, which polls the recipient did not participate in the risk investment with the concession, and returned it to open new concessions.

From the opening concessions for the past 20 times to make concessions to the 155 to 108 and up to the year 2555 with only 53 to 67 only concession operations. Some concession without petroleum exploration. The concessionaire will have to return the concession to the state. Investments in exploration conversion is not so wasteful. But the state also has research conducted by the concessionaire. The state did not take the risk with any investment. And concessions at night, it can be opened a new franchise.

From the open franchise past 20 times make concessions already 108 version of 155 transform and count of years 2555 only 53 concessions 67 convert only operation. Because some sources survey found no petroleum concessionsInvestment in the converted survey found no is wasted. However, the state also survey data from concessionaires. The state does not invest risk too. Concession and back can be used to open new franchise.