序号

Organization

Patents

1

Schlumberger Limited

54

2

Halliburton Company

34

3

China Petrochemical Corporation (Sinopec Group)

25

4

China National Petroleum Corporation

24

5

General Electric Company

20

6

National-Oilwell Varco, Inc.

15

7

Boart Longyear International Holdings Inc.

14

8

Exxon Mobil Corporation

10

9

China University Of Petroleum

9

10

其他

222