1. Derricks can be divided into steel derricks, reinforced concrete derricks, brick derricks, and wood derricks according to different construction materials.
2. The commonly used steel derrick structure generally includes five parts: head, vertical frame, inclined frame, wellhead support beam, and inclined frame foundation.
Installation method of derrick
1.Standing up and rotating method
Assemble the derrick on a leveled site near the wellhead; assemble the mast in the center of the wellhead, lift the mast head with a crane, erect the mast with a stable car, and rotate in place by using the mast and the bottom support hinge of the derrick by the large rotation method; Use the derrick to lower the mast; The vertical frame is used to lift the inclined frame by the sliding lifting method; Finally, the pulley block and mast are removed; The installation requires a large pulling force and more equipment is used. At present, this method is mainly suitable for the situation that the wellhead site is flat and spacious, the weight of the derrick is large, and the height is high.
2.Integral sliding installation method for assembly outside wellhead
Lift the derrick with a jack so that the derrick base is higher than the wellhead; Using the laid slideway, the derrick is slid to the design position of the wellhead with a stable car and a chain hoist. This method is mainly suitable for the situation where the site is limited and the wellhead construction period is small.
