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  2. Wikipedia : Public domain image resources

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    Free-Images.com – More than 12 Million Public Domain/CC0 stock images, clip-art, historical photos and more. Excellent Search Results. Commercial use OK. No attribution required. No login required. Good Free Photos – All public domain pictures of mainly landscape but wildlife and plants as well

  3. Blowout (well drilling) - Wikipedia

    en.wikipedia.org/wiki/Blowout_(well_drilling)

    Early warning signs of an impending well kick while drilling are: Sudden change in drilling rate; Reduction in drillpipe weight; Change in pump pressure; Change in drilling fluid return rate. Other warning signs during the drilling operation are: Returning mud "cut" by (i.e., contaminated by) gas, oil or water;

  4. Extraction of petroleum - Wikipedia

    en.wikipedia.org/wiki/Extraction_of_petroleum

    When oil and gas are burned they release carbon dioxide into the air. Fossil fuels, such as oil, are responsible for 89% of the CO2 emissions. [10] Carbon emissions cause climate change which negatively impacts people's safety by raising sea levels and worsening weather. Oil can also cause oil spills, which pollutes the ocean. [10]

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  9. Christmas tree (oil well) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(oil_well)

    A wellhead is used without a Christmas tree during drilling operations, and also for riser tie-back situations that later would have a tree installed at riser top. Wells being produced with rod pumps (pump jacks, nodding donkeys, grasshopper pumps, and so on) frequently do not utilize any tree owing the absence of a pressure-containment ...

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