Gravel pre-filling sand prevention pipe

Abstract

The invention relates to a petroleum extraction device, and particularly relates to a gravel-prepacked sand control pipe specially used for petroleum extraction, which comprises a base pipe and a sand control pipe shell sheathed outside the base pipe; a gravel layer is filled between the base pipe and the sand control pipe shell, and a plurality of deflector holes are arranged on the pipe wall ofthe base pipe and the pipe wall of the sand control pipe shell. Due to the existence of the gravel layer in the pebble prepacked sand control pipe, the extraction device has good sand controlling effect. A vertical shell can change the flow form and direction of the fluid, thus preventing the blockage of the shell. The base pipe with high flow conductivity can ensure that all the fine sand passing through the gravel layer can output through the base pipe without generating the blockage of the base pipe.

Description

technical field [0001] The invention relates to an oil extraction device, in particular to a special sand control pipe for oil extraction. Background technique [0002] The problem of sand production in unconsolidated sandstone reservoirs has become a key issue affecting the productivity of oil wells. At this stage, more and more new sand control pipes have been put into the market and have been applied in the field. Due to the ever-changing characteristics of reservoirs, different types and structures of sand control pipes have different application ranges, but no matter what kind of sand control pipe, the ultimate goal is to maximize the production capacity of oil wells while controlling sand production. Therefore, the design of the sand control pipe takes these two aspects as the goal to optimize the structure and parameters. At present, the commonly used well completion methods in oil mining sites are mostly open hole screen completion or gravel packing completion. From...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, and design a new type of sand control pipe for pre-packed gravel, which overcomes the shortcoming of unstable production capacity of open hole completion and avoids the complicated construction process of gravel packing in horizontal wells. question

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