Gas-lift valve testing

This letter refers to an article by Zotan Turzo and Gabor Takacs entitled "CFD techniques determine gas-lift valve behavior" (OGJ, June 8, 2009, p. 46).The article stated: "Mainly based on the systematic work performed at TUALP [Tulsa University artificial lift projects], API published the first edition of Gas Lift Valve Performance Testing (API RP11V2) in 1995."The statement is not entirely correct. The testing techniques adopted by American Petroleum Institute for the Recommended Practice (RP) 11V2 had been performed for many years prior to TUALP by Teledyne Merla. I am the chairman of RP 11V2 and former employee of Teledyne Merla. I am quite familiar with the time l...

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