Multilayer gravel packing method and tool

Abstract

The invention provides a multilayer gravel packing method and tool. The method comprises the following steps in sequence: A. a) sinking a disposable multilayer gravel packing tool; and b) inserting insertion positioning seals and automatic guide shoes into sump packers; B. c) setting top packers, examining seal of the top packers and releasing the top packers; and d) setting interlayer isolation packers on the lower layer and examining seal of the interlayer isolation packers; and C. e) packing a lower oil layer; and f) carrying out reverse circulation; repeating the substeps d), e) and f), namely setting the interlayer isolation packers on the upper layer and examining seal of the interlayer isolation packers, packing a middle oil layer and carrying out reverse circulation; and repeating the substeps e) and f), namely packing an upper oil layer and carrying out reverse circulation. The tool is characterized in that a service tool is installed in an outer tube column, wherein the outer tube column comprises the top packers and bush sealing bores, bushes, sealing bores, sliding sleeves, short sections, sieve tubes, the interlayer isolation packers, the insertion positioning seals, the sump packers and the automatic guide shoes which are connected below the top packers; and the service tool comprises setting tools and wash tubes, a central tube, a packing conversion tool, pressure measuring assemblies, rotary positioning tools, one-way sliding sleeve switch tools, two-way sliding sleeve switch tools and bottom isolation seals which are installed below the setting tools.

Description

1. Technical field [0001] The invention relates to a sand control method and tool for oil exploitation wells, in particular to a primary multi-layer gravel filling method and tool. 2. Background technology [0002] At present, there is a sand control tool for oil production wells, which is mainly composed of a packer, a filling sliding sleeve, and a filling conversion tool. The purpose is to carry out gravel filling sand control operations for oil production wells, which has made great contributions to oil production sand control technology. The tools with this structure also have the following shortcomings or deficiencies: (1) Only single-layer sand control and layer-by-layer sand control can be performed; (2) There are many processes and complicated procedures for multi-layer gravel filling sand control. Then it needs to be completed according to the following steps: perforating the bottom layer; lowering into the seat to seal the sand settling packer; lowering the sand co...

AI Technical Summary

Problems solved by technology

[0002] At present, there is a sand control tool for oil production wells, which is mainly composed of a packer, a packing sliding sleeve, and a filling conversion tool. The tools with this structure have the following shortcomings or deficiencies: ① only single-layer sand control and layer-by-layer sand control can be performed; ② multi-layer gravel filling sand control has many techniques and complicated procedures. Then it needs to be completed according to the following steps: perforate the bottom layer; run in the seat to seal the sand settling packer; lower the sand control string in the bottom layer for sand control operation; run in the plugging device; perforate the middle layer; Sand control pipe string in the lower and middle layer for sand control operations; run in the plug; Lowering the tool, the operation cycle is long, and the labor intensity of the operator is high; ④ energy consumption is high, and the cost is high; ⑤ sand control operation speed is slow

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