Downhole settled sand fishing tool

Abstract

The invention relates to a downhole settled sand fishing tool. The downhole settled sand fishing tool comprises a fishing cylinder, a liquid discharge bin and a suction machine. The fishing cylinder is used for containing settled sand, and a cover which is unidirectionally opened toward the interior of the fishing cylinder is arranged at the upstream end of the fishing cylinder; the liquid discharge bin is in liquid communication with the downstream end of the fishing cylinder, a filter is arranged between the liquid discharge bin and the fishing cylinder, and the liquid discharge bin is further directly communicated with the external environment; the suction machine drives the liquid of the liquid discharge bin to flow out continuously, so that liquid, with settled sand, in the external environment flows into a fishing bin continuously. According to the downhole settled sand fishing tool, downhole liquid can circularly flow into and out of the tool, the liquid with the settled sand stays in the tool, and accordingly settled sand fishing is achieved.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to an in-well sand setting and fishing tool. Background technique [0002] At present, oil and gas wells are generally completed by multi-stage and staged fracturing. After a long period of production, fracturing sand or flowback sand (referred to as sand settling) will accumulate in the wellbore, which will adversely affect the productivity of a single well. This adverse effect is especially pronounced for horizontal wells. For example, during the production profile test, the accumulated sand in the well can cause the test tool to be unable to run in place, and the sand at the bottom of the hole will have a negative impact on the measuring instrument. [0003] Since it is not allowed to inject liquid into the horizontal well of the production well to prevent the well from being killed, the sand washing method of the prior art cannot meet the requirements of the horizontal well...

AI Technical Summary

Problems solved by technology

For example, during the production profile test, the accumulated sand in the well can cause the test tool to fail to reach the right position, and the sand at the bottom of the hole will have a negative impact on the measuring instrument

[0003] Because it is not allowed to inject liquid into the production well and horizontal well to prevent well killing, this leads to the sand washing method of liquid injection cycle in the prior art that cannot meet the requirements of horizontal wells

However, the fishing tools commonly used in production wells in the prior art, such as strong magnetic fishing, labyrinth fishing, etc., can only fish metal debris, and the fishing effect on sand settling is not good.

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