Elastic screen and sand control string

Abstract

The invention discloses an elastic sieve pipe and a sand prevention pipe column. The elastic sieve pipe comprises a central slotted sieve pipe, a pressure transmitting piece, a supporting cylinder sleeve, a reset mechanism, and an outer-layer slotted sieve pipe; the outer side of the upper end of the central slotted sieve pipe is fixed to the lower end of an upper joint through a central sieve pipe coupling, a control pin and an upper cylinder body, and the lower end of the central slotted sieve pipe is fixedly connected with the upper end of a lower joint; the pressure transmitting piece is arranged outside the central slotted sieve pipe in a sleeving mode, and an upper expansion mechanism and a lower expansion mechanism are arranged at the two ends of the pressure transmitting piece correspondingly; the supporting cylinder sleeve and the reset mechanism are arranged between the lower expansion mechanism and the lower joint; the two ends of the outer-layer slotted sieve pipe are positioned through sieve pipe protecting sleeves, and the middle of the outer-layer slotted sieve pipe is matched with the upper expansion mechanism and the lower expansion mechanism; and when the pipe column is tripped, the control pin is sheared off, the gravity of the pipe column is transmitted to the upper expansion mechanism and the lower expansion mechanism, and thus the elastic sieve pipe is set. According to the elastic sieve pipe and the sand prevention pipe column, it can be ensured that set sand is basically avoided in a wellbore, the good sand prevention effect is achieved, the pump inspection cycle is effectively prolonged, meanwhile, during using, tripping and salvaging operation is easy and convenient, safety and reliability are achieved, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of oil field sand control technology, in particular to an elastic screen pipe and a sand control pipe string. Background technique [0002] For oil and gas reservoirs whose reservoirs are mostly unconsolidated sandstone, there is generally a serious problem of sand production, and necessary sand control measures must be taken during the production process. [0003] At present, mechanical sand control is mainly completed by running various screens in the casing. When the screen is run in the casing, a sand blocking well wall can be established between the casing and the screen to prevent the formation sand from entering the screen, thereby reducing pump jamming. After the formation sand is spit out, a void will be formed around the borehole wall, which will easily cause collapse and damage to the casing. In addition, during operation, because the screen pipe in the casing is buried in sand, it is difficult ...

AI Technical Summary

Problems solved by technology

However, overhaul operations will seriously affect block development and well production, so it needs to be avoided as much as possible

[0004] However, there is still a lack of an effective way to overcome the problems in the prior art

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