Upstream natural gas and related fluid operations often require the injection of methanol to prevent flow line constrictions and blockages caused by water and natural gas hydrates. Both the constrictions and methanol have a significant impact on measurement accuracy. Natural gas chromatographic analysis and related measurement practices do not account for constrictions or methanol in natural gas streams. API 14.2, A.G.A. Report No.8, A.G.A. Report No.10, ISO 12213, ISO 20765 and GPA 2172 do not account for methanol. Measurement and operation practices rely on accurate information to reduce errors. This...
Upstream natural gas and related fluid operations often require the injection of methanol to prevent flow line constrictions and blockages caused by water and natural gas hydrates. Both the constrictions and methanol have a significant impact on measurement accuracy. Natural gas chromatographic analysis and related measurement practices do not account for constrictions or methanol in natural gas streams. API 14.2, A.G.A. Report No.8, A.G.A. Report No.10, ISO 12213, ISO 20765 and GPA 2172 do not account for methanol. Measurement and operation practices rely on accurate information to reduce errors. This report analyzes the effect of methanol on gas measurement physical properties. It establishes the relative effect of methanol on the physical properties by applying the Gas Research Institute's high accuracy equation of state for natural gases as distributed by API, A.G.A, ISO and others as API MPMS Chapter 14.2, A.G.A. Report No.8, A.G.A. Report No.10, ISO 12213 Part 2, and ISO 20765. It applies GPA 2172 for the analysis of the sensitivity of the heating value to methanol.