An easy-to-pull downhole filter for oil and gas well production and its realization method

Abstract

The invention discloses an easy-pull underground filter for oil-gas well exploitation and an implementation method thereof. The underground filter comprises a base tube and a filter sleeve covering the base tube. The whole underground filter is in a constant outside diameter structure. The easy-pull underground filter for oil-gas well exploitation has the advantages that steps on an underground filter string are omitted, and uplift force for tripping out the underground filter string is reduced; supports are welded to the inner side of a constant diameter filling sleeve, compression resistance of the constant diameter filling sleeve is greatly improved, and the constant diameter filling sleeve is fully capable of bearing clamping force of slips and hydraulic power tongs without deforming; when the underground filter string is lifted up, uplift force is decreased, the use of high-tonnage workover rigs and washover process is avoided, and fishing cost is saved.

Description

technical field [0001] The invention relates to an easy-to-pull downhole filter for oil and gas well exploitation and its implementation method, which is suitable for oil and gas wells in loose sandstone reservoirs that are prone to sand production and wells that need to be filled with particles outside the downhole filter string. The above oil and gas wells It includes vertical wells, inclined wells, horizontal wells, injection wells and production wells, and belongs to the technical field of oil and gas exploitation. Background technique [0002] Downhole filters include downhole sand control filters and downhole filters with flow control functions. Among them, the downhole sand control filter is also called sand control pipe or sand control screen, and the downhole filter with flow control function is also called flow control filter or flow control screen. [0003] The downhole filter string is sometimes composed of one downhole filter, and in many cases is composed of m...

AI Technical Summary

Problems solved by technology

[0010] 1. The downhole filter string is blocked, and it needs to be cleaned and re-run or run into a new filter string;

[0011] 2. The perforation hole is blocked, and the downhole filter string needs to be pulled out to clean the perforation hole;

[0012] 3. The downhole filter string is damaged, and it needs to be pulled out and then run into a new downhole filter string;

The casing milling operation is to insert a casing milling pipe into the annulus between the downhole filter string and the well wall to cover the outside of the downhole filter string, and to remove the formation surrounding the downhole filter string by circulating and flushing while rotating. Sand or gravel, so that the downhole filter string is easy to pull out. After each set of downhole filter is milled in the casing milling operation, the casing milling pipe and the filter need to be lifted out of the ground from the underground, and then the casing milling string When going downhole, a downhole filter is set and milled. Generally, there is a distance of thousands of meters from the ground to the downhole operation position, so the entire operation period is very long and the cost is high.

Moreover, the casing milling operation has requirements for the width of the gap between the downhole filter string and the well wall. If the size is small, the tool cannot be lowered, and the oil and gas well cannot be pulled out by casing milling operation, and even the oil and gas well will be scrapped.

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