Before any workover, the well must first be . Since workovers are long planned in advance, there would be much time to plan the and so the reverse circulation would be common. The intense nature of this operation often requires no less than the capabilities of a . The workover begins by killing the well then removing the wellhead and possibly the flow line, then installing a B.O.P. commonly known as a , then lifting the fr.
[pdf] While we are familiar with most equipment manufacturers ranging from Terra, Zoomlion, TRACTO-TECHNIK, Ditch Witch, Huayuan, Goodeng Machine, Prime Drilling, Lianyungang Huanghai, Herrenknecht, CHTC JOVE, Drillto, Vermeer, XCMG, DW/TXS, Dilong and Toro, we prefer using the following four most often.
[pdf] Price-performance leaders include Jining Hengwang's crawler rig ($1,400 at volume) and Henan Ocean's diesel unit ($3,000 fixed price). For hard rock applications, Shandong Instanton's 5.0-rated rig provides premium capabilities at mid-range pricing.
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