One-time multi-layer gravel packing tool for long-span perforation section

Abstract

The invention discloses a multi-layer gravel packing tool for a long-span perforation section, which includes an outer pipe string running through the entire perforation section and a service pipe string lowered into the outer pipe string. The outer pipe string includes The grit settling packer, the main part of the outer string inserted in the upper part of the grit packer, and the top packer assembly connected to the main part of the outer string are arranged in sequence; the main part of the outer string includes The bottom working pipe section, the middle working pipe section and the sand control section; the sand control section, the middle working pipe section and the bottom working pipe section are equipped with sand control screens and inner liners corresponding to the corresponding perforated layers, and the inner liner and sand control screens An annular space is formed between them, and a production circulation sliding sleeve is connected to the inner liner; the service string mainly adopts a single-layer structure, and the present invention can be used for one-time multi-layer gravel packing fracturing sand control operation in the long-span perforation section, and does not require Layer production can be realized by running the lower completion production string.

Description

technical field [0001] The invention relates to the technical field of sand control in oil production wells, in particular to a primary multi-layer gravel packing tool for a large-span perforation section. Background technique [0002] For unconsolidated sandstone production wells, during the production process, when the produced fluid flows into the wellbore, some formation sand will be carried into the wellbore, which will endanger the electric pump and production equipment. In order to prevent oil wells from producing sand, independent screens or gravel packing are commonly used for sand control. [0003] For some production wells, while controlling sand, it is hoped that a certain scale of fracturing operations can be carried out to achieve the purpose of establishing formation fractures and increasing formation output. Currently, fracturing operations for loose sandstone wells are generally carried out at the same time as sand and gravel packing operations. [0004] In...

AI Technical Summary

Problems solved by technology

However, limited by the two-layer pipe structure of the service string, the liquid friction is relatively large, and it is impossible to complete the operation of the super-long central pipe

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