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can't use frame with width, unfortunately - moved image down to cope with infobox
==Control and measurement system==
==Control and measurement system==
[[File:PinedaleFieldLandRig.png|thumb|Drilling rig in Pinedale field with the Wind River Mountains, Wyoming, USA in the background. Photo by Douglas McCartney.]]
The ''blowout preventors (BOPs)'' are the major component of the control system on a rig, and they are the last line of defence against a blowout. The BOPs are bolted to the wellhead and are not removed until the well is completed and production equipment is installed. BOPs usually have at least four sections:
The ''blowout preventors (BOPs)'' are the major component of the control system on a rig, and they are the last line of defence against a blowout. The BOPs are bolted to the wellhead and are not removed until the well is completed and production equipment is installed. BOPs usually have at least four sections: