Natural Gas Hydrates. A Guide for Engineers by John Carroll

By John Carroll

Rarely coated in formal engineering classes, average gasoline hydrates are a standard challenge and real-life risk for engineers around the world. up-to-date and simpler than ever, Natural fuel Hydrates, 3rd Edition is helping managers and engineers wake up to hurry on the entire most typical hydrate kinds, how one can forecast once they will look, and competently mitigate their elimination. identified for being hugely flammable, gasoline hydrates are a preventable probability which can charges hundreds of thousands of greenbacks in harm, in addition to take the lives of staff and engineers at the rig. The 3rd version of Natural fuel Hydrates is more desirable with contemporary extra complicated but sensible usage wishes including:

  • New hydrate varieties and formers, together with mercaptans and different sulfur compounds
  • Vital details on the best way to deal with hydrate formation within the wellbore, worthwhile info in mild of the Macondo explosion and ensuing oil spill
  • More exact section diagrams, resembling ternary platforms, in addition to extra appropriate multicomponent mixtures
  • Quantifiably degree the stipulations that make hydrates attainable and mitigate the appropriate gear correctly
  • Predict and view the stipulations at which hydrates shape with uncomplicated and intricate calculation exercises
  • Gain wisdom and assessment classes realized from new real-world case reports and examples, overlaying capital bills, dehydration, and new machine methods

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Example text

For example, if you know the pressure, temperature, and gas gravity and you want to know if you are in a region where a hydrate will form, first you locate the pressure-temperature point on the chart. If this point is to the left and above the appropriate gravity curve, then you are in the hydrate-forming region. If you are to the right and below, then you are in the region where a hydrate will not form. Remember that hydrate formation is favored by high pressure and low temperature.

These are in g/Sm3 not mg/Sm3 as in the other tables. In practice, this means that it requires significantly less water to form a hydrate in an LPG than it does in a gaseous mixture of hydrocarbons. On the other hand, the acid gases (hydrogen sulfide and carbon dioxide) behave in an opposite fashion to the hydrocarbons. 18). , April 23–27, 2006. Hydrate Formation in Ethylene, Acetylene, and Propylene. AIChE Spring National Meeting, Orlando, FL. , 2002. Relational expression of the conditions forming hydrates of various components in natural gas.

Express the water content of the gas in pounds per million standard cubic feet (lb/MMCF). 0  C. 5  C, which converts to 49  F. 696 psi, then the volume of 1 lb mol of gas is:   V ¼ nRT P ¼ ð1Þð10:73Þð460 þ 60Þ 14:696 ¼ 379:7 ft3 Then converting from mole fraction to lb/MMCF gives:   ð0:025=100Þ lb mol water 379:7 ft3 Â 18:015 lb lb mol  ¼ 0:0000119 lb ft3 ¼ 12 lb=MMCF Therefore, the gas in equilibrium with the hydrate contains about 12 lb of water per million standard cubic feet of gas.

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