Ecopetrol (EC) 20-F2019 FY Annual report (foreign)

Filed: 31 Mar 20, 9:51pm

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Removed: addenda, addendum, agree, al, Anadarko, apportioned, Ardila, ARPEL, ASC, benchmarking, bimonthly, burden, Casanare, catalyst, causation, claimed, combined, contraction, counter, CPO, cut, degradation, Display, divestment, dramatic, EEB, exposing, FASB, financed, frame, Gibraltar, Hector, Hernandez, impacting, Infovalmer, installment, insurgency, ISP, join, lessor, levied, liquidated, lived, Macondo, marked, match, matching, Missouri, modality, multipurpose, neutralize, Niscota, Organizacion, paralyzed, partnered, Pascagoula, pattern, paying, payor, Petropiar, prorating, reconcile, replenishment, Rolla, Santo, semester, shortest, stretch, subordinate, subtracting, suitable, Tabular, Texaco, Topic, tranche, underSummary, unload, unloaded, Upgrader, utilize, VAS, wide

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Exhibit 23.6

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS

We hereby consent to the inclusion in this Annual Report on Form 20-F of Ecopetrol S.A. for the year ended December 31, 2019 (the "Annual Report") of our report dated March 13, 2020, with respect to estimates of net reserves to the Ecopetrol S.A. interest, as of December 31, 2019 (our "Report") and to all references to our firm included in the Annual Report, as well as to the incorporation by reference of our Report into the Registration Statement on Form F-3 of Ecopetrol S.A., filed with the United States Securities and Exchange Commission on June 1, 2018 (the "Registration Statement").

	NETHERLAND, SEWELL & ASSOCIATES, INC.

	By:	/s/ C.H. (Scott) Rees III
		C.H. (Scott) Rees III, P.E.
		Chairman and Chief Executive Officer

Dallas, Texas

March 27, 2020

Please be advised that the digital document you are viewing is provided by Netherland, Sewell & Associates, Inc. (NSAI) as a convenience to our clients. The digital document is intended to be substantively the same as the original signed document maintained by NSAI. The digital document is subject to the parameters, limitations, and conditions stated in the original document. In the event of any differences between the digital document and the original document, the original document shall control and supersede the digital document.