China's largest oil and gas producer will pay $1.63 bn (1 billion pounds) of equity.
Chinese companies have been trying to satisfy China's growing energy demand, make its economic growth, keen to purchase oil and gas assets.
Earlier this month, China's cnooc got Canadian authorities over oil company Nexen company's consent.
"The acquisition is the main driving force for the Chinese market's oil and natural gas source," Tony Reagan's consulting company, three zen told the BBC.
"Although China's domestic production of continuous growth, this is never able to keep up with demand growth," he added.
"More security
Petrochina has agreed to buy BHP billiton (BHP) 8.3% of the shares in the joint venture in the west east through browse and 20% of the shares.
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"
Began to offer
I think they are looking for more security become producers of these assets of equity partners"
Tony Reagan
Three zen
This agreement is subject to regulatory approval and other members of the joint venture enterprise have the right to match the oil price.
If approved, this will be China's oil and gas company investment this year a series of the latest.
One of the most important is China national offshore oil corporation purchase Canada Nexen company for $15.1 bn, call Canada, it may give too much influence, the Chinese in Canada's oil and natural gas department's attention.
In November, state-owned sinopec for 2.5 billion dollars to buy the French oil company total company in Nigeria 20% stake in offshore oil field.
In January, sinopec reached $2.2 billion deal won over one-third of the shares, headquartered in the United States, Devon energy companies in the United States to the shale.
In addition, in January, petrochina announced that it has bought 40% of the shares, it does not have his MaiKaiHe in Canada's oil sands project for 673 meters.
According to bloomberg compiled data shows, the Chinese enterprise has announced the purchase of $25 billion worth of oil and natural gas department this year.
Analysts said that part of the deal, the Chinese enterprise's efforts to ensure that long-term energy supply.
"They can from the international market to buy oil and natural gas, but I think they are looking for more security become producers of these assets of equity partners, three Mr. Chan said:" Ronald Reagan.




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