Performance testing method and pipe string for expanding packer

Abstract

The invention relates to a performance testing method and a pipe string for an expanding packer. The method comprises a well entering test stage, and the well entering test stage comprises the following steps that a pipe string containing a to-be-tested packer is tripped into a preformed borehole; the interior of the pipe string is pressurized, so that a rubber sleeve of the to-be-tested packer expands and is set on the well wall of the well hole; and pressurizing the annular space between the pipe string and the borehole is pressurized so as to improve the pressure in the annular space above the to-be-tested packer, so that the underground upper pressure difference performance of the to-be-tested packer is tested, and / or after the rubber sleeve of the to-be-tested packer is set, a circulation channel is formed in the portion, located below the to-be-tested packer, of the pipe string so as to be communicated with the annular space between the pipe string and the well hole, the interior of the pipe string is pressurized so that the pressure in the annular space below the to-be-tested packer can be increased, and therefore the underground lower pressure difference performance of the to-be-tested packer can be tested.

Description

technical field [0001] The invention relates to the technical field of downhole tool design, in particular to a performance testing method for an expandable packer. The invention also relates to a performance test pipe string of an expansion packer. Background technique [0002] The packer is an important tool used to ensure the smooth progress and safety of downhole operations. Therefore, operators often test the performance of packers before using them in actual well operations. [0003] However, although packers include many types, such as wedge packers, expansion packers, compression packers, etc., all packers are currently tested for performance using a standard test method . The standard test method is to prepare the casing in the laboratory, set the packer to be tested into the casing, set the packer, and test by applying pressure from one or both ends of the casing . [0004] This test method is very simple, but relatively rough. There are a number of problems ...

AI Technical Summary

Problems solved by technology

For example, expansion packers that pass the test may still fail in actual use

Or, after the test, the expandable packer was difficult to remove from the casing, or was found to be damaged when removed

Especially for expandable packers with shoulder guards, the original role of the shoulder guards is to avoid damage to the shoulders of the rubber tube. However, the existing standard test methods are more likely to cause damage to the rubber tubes at the shoulders. And the shoulder pads will also make it harder to remove the expandable packer

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