Sand control completion method for drawing and expanding sand screen underground and tool thereof

Abstract

The invention discloses a sand control completion method for drawing and expanding a sand screen underground and a tool thereof, and is particularly applicable to sand control completion construction of sandy oil gas wells of oil fields. The method comprises the steps of firstly laying a tubular column anchor (1), an expanding sand screen (4) and an inner tube expanding tool (2) in a design position in a well along with a tubular column; applying pressure to the interior of the well so as to ensure that the tubular column anchor (1) is anchored on the tubular column; then enabling the inner tube drawing and expanding tool (2) to move upwards, so as to enable the expanding sand screen (4) to be adhered to the well wall and further complete the sand control completion construction of an oil-gas well. The special tool of the method comprises the tubular column anchor (1), the expanding sand screen (4) and the inner tube drawing and expanding tool (2). As the expanding sand screen (4) is pulled and expanded to be adhered to the wall of the well, the flowing of sand grains is limited, a sand screen is prevented from being flushed and damaged, after the sand screen is drawn and expanded, the completion well is large, the filtering flow effect is good, the yield is high, the implementation of follow-up measures is facilitated by virtue of the large inner diameter, and compared with a hydraulic taperexpanding screen pipe pushing technology, the success rate of the method is higher.

Description

technical field [0001] The invention relates to a sand control well completion method and a tool for pulling out an expanded sand filter pipe downhole, and is particularly suitable for the sand control well completion process of sandy oil and gas wells in oil fields. Background technique [0002] At present, the downhole expansion sand control method of sand filter tube is to lower the sand filter tube of conventional size to the bottom of the well, and then use mechanical means to expand the inner and outer diameters to become larger, and the outer wall is close to the well wall. It is a new sand control technology. At present, similar technologies at home and abroad use the top-down expansion method of the inner pipe. Generally, the front part of the inner pipe is a hydraulically variable diameter expansion cone, followed by a hydraulic cylinder piston structure, an inner pipe anchor, and the filter sand pipe is lowered into place. Afterwards, the lower inner pipe is combi...

AI Technical Summary

Problems solved by technology

Existing process defects: 1. The inner tube has a complex combination, including anchors, hydraulic cylinder pistons, hydraulic variable diameter cones, etc. The more complex the greater the risk of failure; 2. The expansion process is inefficient, complex and high in strength

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