Fast safe solid expandable tube reinforcement device for oilfields

Abstract

Disclosed is a fast safe solid expandable tube reinforcement device for oilfields. An expander is placed in an expandable patch tube in clearance fit in a broken well casing. The expander comprises a hydraulic tube and a fast inserting rod; the lower end of the hydraulic tube is connected to the upper port of the fast inserting rod, the lower end of the fast inserting rod is embedded in an expandable cone, and the cylindrical portion of the expandable cone tightly matches with the inner wall of an expandable chamber; a lifting rod penetrates the hydraulic tube, the fast inserting rod, the expandable cone in clearance fit from bottom to top, and the lower end of the lifting rod is tightly connected to a combined bottom plug; the combined bottom plug comprises a mandrel, and the mandrel penetrates a piston body, a two-way slip, is embedded in a guide cone holder and is fixedly connected with a pin. The device has the advantages that casing patching operation efficiency is improved greatly, the patching period is shortened, and significant economic benefits can be created. The device is characterized in that after pressing operation of the expandable tube is finished, the expandable cone moves upwardly till the upper port of the expandable tube and drives the lifting rod to move upwardly, the lifting rod drives the combined bottom plug to move upwardly, and the positioning part of the combined bottom plug can reduce automatically to relieve the limit and can be lifted out from the upper end of the expandable tube.

Description

technical field [0001] The invention relates to a casing repair device, in particular to a rapid and safe solid expansion pipe reinforcement device for oil fields. Background technique [0002] The solid expanded pipe technology is to lower the pipe string into the bottom of the well, and use the expansion cone to permanently deform the pipe by means of pressure or mechanical force, so as to achieve the purpose of increasing the inner diameter of the wellbore. This technology can be used in operations such as drilling, completion and workover, and is considered to be one of the core technologies of the oil drilling industry in the 21st century. However, in the middle and late stages of oilfield development, the damage to the casing becomes more and more serious. Casing damage makes oil and water wells unable to produce normally, and has a serious impact on the comprehensive economic benefits of the entire oilfield development. At present, the total number of closed wells d...

AI Technical Summary

Problems solved by technology

However, due to design defects, there are problems as follows: 1: When the expansion tube rebounds too much due to the influence of external force, the diameter is smaller than the diameter of the bottom plug, and the bottom plug cannot be lifted; not come up

Due to the above problems, it is easy to cause the reinforcement subsidy to fail, and the overhaul well to be scrapped, resulting in huge economic losses

Images