Ortiz, J.L.: "Gas Lift Engineering in Lagoven: A New Vision" II LatinAmerican Hydrocarbon Congress, ARPEL, Rio de Janeiro, Brazil, September 1988, Vol.3, No.3, pp 187-195.
Bravo, C.T. , Mata A., and Ortiz, J.L. : "Artificial Intelligence Applied to Gas Lift : DIALOGO System" Work presented in the VII Lagoven's Technical Congress, Amuay Refinery, Venezuela, January 1988.
Zimmerman, W. and Ortiz J.L.: "Slug Flow Gas Lift" Work presented in the French Venezuelan Multiphase Flow Seminar. Held in Intevep. Los Teques. Venezuela. September, 1987.
Ortiz, J.L.: "Analysis and Diagnosis of Gas Lift Wells" Work Presented in the First Artificial Lift Seminar Petroleos de Venezuela. Held in Lagovèn. Maracaibo. Venezuela. September, 1985.
Ortiz, J.L.:" Gas Lift Optimization Using SOLAG". Work presented in the First Production Technology Congress held in Intevep. Los Teques. Venezuela. January 1985.
Araujo, M. and Ortiz, J.L.: "Communication Tests in Gas Lift Wells". Seventh Technical Seminar of the Venezuelan Society of Petroleum Engineers. SVIP. Caracas. Venezuela. 1984.