Casing subsidy section pressure-bearing detection process pipe string and method

Abstract

The invention provides a casing subsidy section pressure-bearing detection process pipe string and method. The pipe string comprises a casing, an oil pipe, a first packer, a second packer, a flow guiding device and a drain device. A subsidy section is arranged on the inner wall of the casing. The oil pipe is arranged in the casing in a sleeved mode, and forms an annular space with the casing. Thefirst packer is arranged above the subsidy section of the casing. The second packer is capable of passing through the subsidy section of the casing and is arranged under the subsidy section of the casing. The flow guiding device is connected to the oil pipe and corresponds to the position of the subsidy section of the casing. The flow guiding device has at least two working states, when the flow guiding device is in the first working state, the interior of the oil pipe is separated from the annular space, and when the flow guiding device is in the second working state, the interior of the oilpipe communicates with the annular space. The drain device is connected to the tail end of the oil pipe, and is used for draining fluid in the oil pipe. Through the design of the pipe string, the detection of the subsidy section of the casing can be effectively realized, and the problem of the overflow of the pipe string can be solved.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a pipe string and a method for pressure-bearing detection process of casing subsidy section. Background technique [0002] At present, some heavy oil blocks mostly adopt high-temperature steam flooding or steam huffing and other production processes. However, long-term mining will cause serious layer channeling between formations, resulting in damage to the casing of the production well. This requires workers to repair and subsidize the casing. After the casing is subsidized, the diameter of the subsidized section will be reduced, resulting in the inability of conventional downhole tools to be lowered below the subsidized section of the casing, which in turn determines whether the pressure of the subsidized section meets the requirements. Effective detection cannot be performed. [0003] For this, there is no effective solution yet. Contents of th...

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Problems solved by technology

However, long-term mining will cause serious layer channeling between formations, resulting in damage to the casing of the production well

This requires workers to repair and subsidize the casing. After the casing is subsidized, the diameter of the subsidized section will be reduced, resulting in the inability of conventional downhole tools to be lowered below the subsidized section of the casing, which in turn determines whether the pressure of the subsidized section meets the requirements. Unable to detect effectively

[0003] There is currently no effective solution for this

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