Design method of expansion sleeve for oil field

Abstract

The invention relates to a method of designing a pipe column used in the operation of an expansion casing in the petroleum industry, in particular to a method of designing an expansion casing with buffering capacity. The invention is characterized in that: a buffering mechanism is arranged on the expansion casing to reduce impact and pressure on the expansion casing, and the buffering mechanism is a slip joint. The expansion casing is at least provided with an expansion pipe (2), an expansion cone (10) and a pipe column (1); wherein the lower end of the expansion pipe (2) is connected with a plug (11), the expansion cone is arranged on a preformed pyramidal section of the expansion pipe (2); the upper end of the expansion pipe (2) is connected with the pipe column (1), and the slip joint is arranged between the pipe column (1) and the expansion cone (10). The invention reduces the risk in the process of expansion operation, improves the reliability in the process of the operation of the expansion casing, and is convenient for maintenance.

Description

technical field [0001] The invention relates to a design method for pipe strings used in the operation of expansion casings in the petroleum industry, in particular to a design method for expansion casings with buffer capacity. Background technique [0002] Expansion casings are used in oil fields to repair corroded casings in oil wells to maintain the integrity of oil well casings, maintain normal oil well production, and extend the life of oil wells; they can also be used in drilling operations to solve some complex problems in the drilling process , such as when drilling into salt layers or easily collapsed formations, the expansion casing work pipe can be used to maintain the integrity of the wellbore and ensure the continuation of drilling operations; drilling in deep and ultra-deep wells or drilling operations that require multiple layers of casing Among them, the use of expansion sleeve technology can obtain a relatively large inner diameter of the end, which is conve...

AI Technical Summary

Problems solved by technology

When the expansion pipe body is anchored on the casing, as the pump continues to pressurize, the expansion cone starts to go up. Since the expansion cone and the drilling tool are hard connected, the weight of the drilling tool will be added to the expansion cone, causing expansion. When the additional pressure increases sharply, these additional pressures will cause the sealing failure of the plug in the starting chamber, and the expansion operation will be abandoned halfway.

And maintenance is inconvenient

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