Process of reinforcing underground supercharged expansion pipe

Abstract

A process of reinforcing underground supercharged expansion pipe mainly solves the problem that the existing processes of reinforcing expansion tube are dangerous due to high pressure on the ground pump and increases the labour intensity due to the delivery of special pipe column. The process is characterized in that a process tube (6) connected with an underground supercharger (5) on the upper end thereof is delivered in the well, and a deliver oil pipe (4) delivers the underground supercharger (5) and other pipe columns thereunder to the predetermined depth; a ground pump (1) bulges; the underground supercharger (5) converts the low-pressure liquid into the high-pressure liquid to be transported to an expansion pipe (11) which is expanded overall to cling to the inner wall of a broken casing (12), and then releases to take out other kits except for the expansion pipe (11). In the invention, the ground supercharger is avoided to reduce the ground construction pressure, increase the safety for operators, and the labour intensity is reduced through the deliver by using the original production pipe columns.

Description

Technical field: [0001] The invention relates to a method for sealing and reinforcing a casing damaged section in the workover process in the oil field, in particular to a downhole pressurized expansion tube strengthening process. Background technique: [0002] At present, Daqing Oilfield has been developed for 50 years. Due to the influence of various geological factors, corrosion, and engineering factors, a large number of damages such as casing shrinkage, rupture, and dislocation have occurred in the underground casing, resulting in the failure of the production string to go down to the predetermined position. Therefore, normal production cannot be performed. In order to restore the production capacity of such wells, the damaged casing must be repaired, the reduced diameter must be enlarged, and the leakage due to the damage must be sealed and subsidized. Expansion tube reinforcement technology is a technology that repairs the small-diameter steel tube down to the damage...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of the existing expansion tube strengthening process, such as the high risk caused by the high pressure of the ground pump, and the need to deliver special pipe strings underground to increase the labor intensity of the workers, the present invention provides an underground pressurized expansion tube reinforcement process. The downhole pressurized expansion tube reinforcement process cancels the surface high-pressure pump, reduces the construction pressure of the surface pump, and improves the safety of ground operators; at the same time, the original production string in the well is used for delivery, which simplifies the spinning process and reduces labor intensity

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