The offshore platform has many cluster wells and directional wells. The well spacing is small and the
wellhead is dense. The wellheads are often covered and blocked by the drilling and workover rigs, and unable to cooperate with the hoisting
wellhead system during the well production test or pressuretesting using steel wire. It will extend the construction period. A new type of
simple derrick lifting operation is explored to improve the working efficiency. On the basis of the original simple oil derrick, the auxiliary
equipment such as the lifting slip of the blowout prevention system, the special manhole cover and the special manhole cover guard plate are
developed to make up for the shortcomings of the traditional simple derrick in terms of stability and safety. This series of equipment have been
successfully tested in the JZ251SA06 well for the first time and gradually applied in the Liaodong operation area, with a success 100% rate.
The new simple oil derrick realizes simultaneous or cross operation of the well testing, drilling and modifying of the platform production wells.
It improves the working efficiency and ensures the safety of personnel and equipment at the construction site.