行业分类: 开采专业及辅助性活动

China Petroleum Engineering Corporation

Offshore Oil Engineering Co., Ltd.

Sinopec Oilfield Service Corporation

CNOOC Energy Technology and Services Limited

China Oilfield Services Limited

Bomesc Offshore Engineering Company Limited

Jchx Mining Management Co., Ltd.

Xinjiang Zhundong Petroleum Technology Co., Ltd.

CHINA OIL HBP SCIENCE&TECHNOLOGY CO.,LTD

Zhejiang Renzhi Co.,Ltd.

Guangdong Hongda Holdings Group Co., Ltd.

Beiken Energy Group Co.,Ltd.

Haimo Technologies Group Corp.