Anti-blocking water control screen pipe

Abstract

The invention discloses an anti-blocking water control screen pipe. The anti-blocking water control screen pipe comprises a base pipe, a wire winding screen sleeve and a slotted screen sleeve sequentially sleeve the base pipe from inside to outside, a supporting sleeve is connected to the lower end of the wire winding screen sleeve, a filtrate channel is formed between the supporting sleeve and the base pipe, and a sand passing channel is formed between the wire winding screen sleeve and the slotted screen sleeve. An upper end ring and a lower end ring are correspondingly arranged on the basepipe; a plurality of shakeout grooves are formed in the lower end ring in the circumferential direction, and the shakeout grooves communicate with the sand passing channel; a sheath is hermetically connected with the lower end of the supporting sleeve, a valve seat is installed at the lower end of the base pipe in a threaded mode, a water control valve is installed on the valve seat, and a liquidflow channel communicating with the filtrate channel is formed between the valve seat and the sheath; and the water control valve comprises a liquid inlet, a rotational flow cavity and a liquid outlethole, and the liquid inlet is streamlined and forms a tangential motion trail with the inner wall of the rotational flow cavity. The self-cleaning capacity and the anti-blocking performance can be improved while oil field effluent is controlled, the water content of an oil field is greatly reduced, the service life of a sand filter pipe is prolonged, and the oil yield and the recovery ratio of anoil well are improved.

Description

technical field [0001] The invention relates to the technical field of downhole sand control for oil and gas well development in oil fields, in particular to an anti-clogging and water-controlling screen pipe. Background technique [0002] At present, domestic oilfield exploitation has entered the middle and late stages, and the water content of the oilfield has increased significantly, which has greatly affected the production of the oilfield. The current water-controlled completion technologies such as: segmental variable density screen controlled water-controlled completion, centrally controlled water-controlled completion Although water control technologies such as ICD and ICD control water well completion have alleviated the problem of oil well water production to some extent, these water control well completion technologies prolong the production cycle of oil wells at the expense of oil field production, and cannot truly achieve stable production. At the same time redu...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic oilfield exploitation has entered the middle and late stages, and the water content of the oilfield has increased significantly, which has greatly affected the production of the oilfield. The current water-controlled completion technologies such as: segmental variable density screen controlled water-controlled completion, centrally controlled water-controlled completion Although water control technologies such as ICD and ICD control water well completion have alleviated the problem of oil well water production to some extent, these water control well completion technologies prolong the production cycle of oil wells at the expense of oil field production, and cannot truly achieve stable production. At the same time reduce the problem of oil field water discharge

[0003] For highly deviated wells in oilfields, sand-producing formations with complex stratigraphic structures, especially sand-producing formations with poor sorting performance, are difficult to control sand, and when using general screens for sand control, it is impossible for the mud and sand entering the first filter layer to Passing through the second filter layer smoothly, there will always be a part of the mud and sand trapped between the first and second filter layers. The more the mud and sand accumulate, the screen will be blocked, and the sand control period will be short, which will eventually affect production and increase costs.

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