Sieve tube sand prevention pipe column and releasing method thereof

Abstract

The invention discloses a sieve tube sand prevention pipe column and a releasing method thereof. The pipe column comprises a sand prevention well remaining pipe column and a flushing pipe column, wherein the sand prevention well remaining pipe column comprises, in order from top to bottom, a sand prevention packer, a length adjusting light pipe, a sand prevention sieve pipe, a sanding setting light pipe and a flushing tool, and the flushing tool is provided with a switching mechanism; the flushing pipe column includes a washing pipe, a vibration washing machine disposed on the washing pipe anda flushing insert connecting tool matched with the flushing tool; when sand sticking occurs in the sand prevention well remaining pipe column, the flushing pipe column is lowered into the sand prevention well remaining pipe column, the flushing insert connecting tool opens the switching mechanism of the flushing tool, and the annulus outside the sand prevention well remaining pipe column is communicated with the interior of the flushing pipe column to form a flushing and releasing circulation passage. The sieve tube sand prevention pipe column and the releasing method thereof achieve high-efficiency releasing and quick salvage of the sieve tube sand prevention pipe column by means of liquid flow flushing.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a screen tube sand control string and a jam-releasing method thereof. Background technique [0002] The screen sand control string is generally composed of packers, blind pipes, screen pipes and dead plugs (silk plugs) from top to bottom. In addition, safety joints can sometimes be installed in the string. When in use, the screen sand control string is lowered into the wellbore of the sand producing oil and gas well, and the filter function of the screen is used to block the strata carried in the formation production fluid outside the screen, so as to achieve the purpose of sand control. On the whole, screen sand control is a kind of mechanical sand control technology, which has become one of the most widely used sand control technologies in oil extraction because of its simple construction and low cost of measures. [0003] However, in field application, it is ...

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Problems solved by technology

[0003] However, in the field application, it is found that the later salvage of the sand control string of this screen is very difficult. The reason is that after a period of time, a sand layer is formed outside the string and in the annulus of the wellbore, and the sand control string is stuck by the sand layer.

Therefore, it is usually necessary to use overhaul operations to cooperate with salvage, and there are problems such as many times of lifting and lowering pipe strings in salvage operations, long salvage periods, and high salvage operation costs

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