41. Underwater wellheads were traditionally more difficult and costly to maintain than wellheads on platforms above the water. 42. Underwater wellheads were traditionally more difficult and costly to maintain than wellheads on platforms above the water. 43. Those and larger fake rocks are sometimes used to cover up wellheads and such in suburban yards. 44. The wellhead apparently cracked and exploded, sending a large pipe to the surface, she said. 45. Land and subsea BOPs are secured to the top of the wellbore, known as the wellhead . 46. After blowing out the fire, the wellhead must be capped to stop the flow of oil. 47. Locating multiple wellheads within a single glory hole is made possible by the use of directional drilling. 48. An annular blowout preventer is a large valve that uses a wedge to seal off a wellhead . 49. On 24 April, USCG Rear Admiral Mary Landry announced that a damaged wellhead was indeed leaking. 50. The rest of its revenue comes from sales of equipment used for treating crude oil at the wellhead .
