Petroleum expansion pipe hanger and construction technology

Abstract

The invention relates to a device which enables two petroleum casing pipes with different diameters to be hanged and connected by expanding the casing pipes underground, and a construction technology.The device comprises a drilling string, an expansion pipe hanging body, a length-adjusting scroll cover set, an expansion transmitting room and a tail pipe connection pair and is characterized in that the drilling string consists of an adjusting-centering pipe nipple, a transition drill pipe, a push-pull central pipe and a bearing screw cap; the expansion pipe hanging body consists of a casing pipe, a hanging pipe, a hanging projection and a hanging rubber ring; the length-adjusting scroll cover set consists of a length-adjusting scroll cover and a clamping nut; the expansion transmitting room consists of a pull cap, a propelling piston, an expansion head, an upper expansion pipe cavity body, a lower expansion pipe cavity body, a steel ball, a transmitting seat, an O-shaped seal rig and acirclip for a hole; and the tail pipe connection pair consists of a lower expansion pipe, a tail pipe connection hoop and tail pipes. The invention has the advantages that hanging modes of hydraulicpush, lubrication expansion head and hard and soft combination are adopted, thereby having reliable tightness and strong hanging capability; and circulation of drilling fluid, injection of cement paste and hanging connection can be completed in one construction, and thereby convenient operation is achieved.

Description

technical field [0001] The invention belongs to the connection between pipelines, and in particular relates to a connection device for suspending and connecting two kinds of oil casing pipes with different diameters by expanding and expanding the casing pipes downhole. Background technique [0002] In oil drilling and special well-type construction, multi-layer casings are run in, and the casings of the same specification are usually connected by threads; while casings of different diameters are connected by suspension, this suspension device is called a hanger. [0003] At present, a kind of mechanical rail hanger is widely used. Due to the limitation of connection space and the lack of structural design, this kind of hanger often shows insufficient suspension force when used, and the suspension claws often break and fall off, causing the suspended tailpipe to fall into the well, resulting in Accidents; in addition, there is another fatal weakness, the mechanical rail hange...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above problems, the present invention proposes a new oil expansion pipe hanger, which solves the problems of insufficient suspension force and seal leakage of the existing hanger, and the drilling fluid circulation, mud injection and suspension connection processes are completed at one time

Images