Pre-filling sand control screen and processing method thereof

Abstract

The invention provides a pre-filling sand control screen and a processing method thereof. The sand control screen comprises a base tube and a plurality of sand control short sections, wherein the basetube is provided with a plurality of overflowing sections; a plurality of open holes are formed in the overflowing sections; the overflowing sections are sequentially arranged in the axial direction;the sand control short sections correspond to the overflowing sections; the sand control short sections are arranged on the corresponding overflowing sections in a sleeving manner; each sand controlshort section comprises an inner protective sleeve, an outer protective sleeve and a sealing ring; the outer protective sleeves are arranged on the inner protective sleeves in a sleeving manner; annular spaces for filling ceramsite are formed between the outer protective sleeves and the inner protective sleeves; each sealing ring comprises an upper sealing piece for sealing the upper end of the corresponding annular space and a lower sealing piece for sealing the lower end of the corresponding annular space; a plurality of first filtering holes are formed in the tube wall of each outer protective sleeve; and a plurality of second filtering holes are formed in the tube wall of each inner protective sleeve. According to the pre-filling sand control screen and the processing method thereof provided by the embodiment, the processing technology is simplified, the field operation time is shortened, and the effective overflowing sections are increased.

Description

technical field [0001] The application relates to a pre-packed sand control screen and a processing method thereof. Background technique [0002] At present, the on-site sand control methods in oil fields mainly include gravel packing sand control, chemical sand control and mechanical screen sand control. Among them, mechanical screen sand control accounts for about 90%. Pre-packing sand control is a method of mechanical screen sand control. Prepacked sand control screens have similar characteristics to gravel packing sand control, and can be used for sand control in reservoirs with high shale content, and can replace part of gravel packing sand control. It is difficult to carry out gravel packing, and the cost of filling operation is high, but it must be used Gravel packed well. [0003] But for example, the existing pre-packed sand control screen is a single piece every 5m. It needs to be connected one by one when running on site, which requires a lot of work and takes...

AI Technical Summary

Problems solved by technology

When running on site, it needs to be connected one by one, which requires a lot of work and takes a long time.

In addition, blind sections need to be reserved at both ends of each single screen, which shortens the effective flow section of the pre-packed sand control screen and affects the productivity of the oil well.

Moreover, the existing sand control screens are usually processed together with the base pipe as a whole, and filled with gravel by vertical vibration. Therefore, the existing sand control screens have the risk of working at heights, and the processing is difficult and costly.

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