Expansion pipe device for oilfield well completion

Abstract

The invention relates to a expansion tube device used in oil field well completion, which comprises a expansion tube, a connection screw, a embedded plastic ring, a suspending tube hoop, a suspending tube, a drilling hole, a centralizer, a positioning nut, a vibrating expansion head, a compression sealing plug, a shape memory ring, a cylinder sealing bottom, a auxiliary cylinder, and a fixing anchor. Wherein, the weight proportion of tube material is: C:0.05-0.35, Si:0.5-2.5, Mn:0.8-2.5, Cr:0.05-3.00, Ni:0.00-3.00, S<=0.03, P<=0.035, and the others is Fe; the plastic elongation delta of expansion tube is 30-35%, the strength sigma b is 620-650MPa, and the strong plasticity K=18600-22000MPa%. The invention has simple structure, easy connection and high sealing degree, while it can apply the well completion in side drilling and other inland wells with better economic benefits.

Description

technical field [0001] The invention relates to an oil casing, in particular to a deformed and expanded casing material for oil field completion, a pipe connection and an expansion device. Background technique [0002] Solid Expandable Tubulars SET (Solid Expandable Tubulars) is a new technology in oil drilling, completion, workover and suspension engineering. The method is characterized in that the casing is sent down to the predetermined position for drilling, mud is injected into the outer space of the casing, and then the diameter of the casing is expanded by 7-30% through mechanical rolling ball extrusion or hydraulic cone expansion. This expansion tube technology can reduce the size of the drill hole and optimize the wellbore structure; at the same time, the expansion pushes and compacts the mud foundation to improve the service life of the oil well; By expanding the repair diameter, you can continue to use the original tools and increase crude oil production; the lin...

AI Technical Summary

Problems solved by technology

However, due to the addition of too many alloying elements in the material, the cost is high

In addition, the shape memory connection is used in the on-site construction, and the process is relatively complicated.

At present, the price of expansion tubes used at home and abroad is too high, and the supporting products are also very expensive, which limits the long-distance application of expansion tubes.

So far, the application cases of more than 1,000 meters or full-well expansion tubes in the world are less than 10% of the total number of wells.

In addition, the expansion pipes used in long-distance drilling and well completion projects have relatively complicated matching technology, and the self-weight of the pipe string and special hanging force are relatively large, which puts forward more stringent requirements for pipe connection strength, sealing technology and engineering construction.

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