Exhibit 23.3
| TBPE REGISTERED ENGINEERING FIRM F-1580 | | FAX (713) 651-0849 |
| 1100 LOUISIANA | | SUITE 3800 | | HOUSTON, TEXAS 77002-5235 | | TELEPHONE (713) 651-9191 |
July 14, 2010
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS
Ryder Scott Company, L.P. consents to the references to our firm included in Ecopetrol S.A.’s annual report on Form 20-F for the year ended December 31, 2009 (the “Annual Report”), and to the inclusion of our report dated April 15, 2010 (our “Report”) as Exhibit 99.1 to the Annual Report, as well as to the incorporation by reference of this consent and our Report into Ecopetrol’s S.A.’s registration statement on Form F-3 filed with the United States Securities and Exchange Commission on February 12, 2010.
| | /s/ Ryder Scott Company, L.P. |
| | |
| | RYDER SCOTT COMPANY, L.P. |
| | TBPE Firm Registration No. F-1580 |
Houston, Texas
| 1200, 530 8TH AVENUE, S.W. CALGARY, ALBERTA T2P 3S8 | | TEL (403) 262-2799 | | FAX (403) 262-2790 |
| 621 17TH STREET, SUITE 1550 DENVER, COLORADO 80293-1501 | | TEL (303) 623-9147 | | FAX (303) 623-4258 |
