Mechanical sand prevention method for small sleeve producing well, mechanical sand prevention tubular column and fishing tool

Abstract

The invention provides a mechanical sand prevention method for a small sleeve producing well, a mechanical sand prevention tubular column and a fishing tool. The mechanical sand prevention method forthe small sleeve producing well, the mechanical sand prevention tubular column and the fishing tool can change the current situation that the current small sleeve producing well only uses chemical sand prevention and improve the sand prevention efficiency, and the down-hole tubular column is conveniently fished in later remedial work. A packer with a release function is connected to the mechanicalsand prevention tubular column, the packer is not provided with a cava supporting mechanism and a cava, the bottom of the mechanical sand prevention tubular column abuts against the sand surface of an artificial bottom of a well and a ball is threw into the packer to provide expanding force for pressing sealing, and the mechanical sand prevention tubular column can release through liquid pressingand mechanical back-off. The fishing tool comprise a fishing upper connector and a fishing barrel, an inner thread of the lower portion of the fishing upper connector is connected with a core shaft,and the upper portion of the fishing barrel is connected with the core shaft through a guide pin. According to the mechanical sand prevention method for the small sleeve producing well, the mechanicalsand prevention tubular column and the fishing tool, an effective tubular column for construction is provided for the mechanical sand prevention of the small sleeve well, the fishing tool is furtherprepared for the later remedial work, and the structure is simple and construction is convenient.

Description

technical field [0001] The invention relates to a mechanical sand control method and tool for small casing wells in the petroleum industry, in particular to a mechanical sand control method for small casing production wells, a mechanical sand control string and a fishing tool, which changes the current situation that only chemical sand control is used in small casing production wells, and improves The sand control is efficient, and it is convenient for the salvage of the downhole string in the later workover operation. Background technique [0002] For unconsolidated sandstone reservoirs, the initial production is basically a 5.5-inch casing. Due to years of development and production, affected by factors such as sand production, corrosion, and high-pressure measures during the development process, casing damage has become increasingly serious. [0003] Putting small casings in the above-mentioned casing damaged wells to make these wells re-produce is an effective means of t...

AI Technical Summary

Problems solved by technology

Due to the small median sand particle size, serious heterogeneity and high shale content in the sand production well, the construction pressure of the small cased well is high, the sand addition is small, the wellbore size is limited, and the drilling technology is not perfect. Conventional oil wells are used It is difficult to salvage in the later stage for sand control of the pipe string for sand control of the middle-hanging sand filter pipe

This is because conventional downhole packers are equipped with slips and slip support mechanisms with slips. The slips anchor the sand control string in the casing through the slips. In the casing, the packer is easily stuck in the casing, leaving troubles for future workover operations

[0004] At present, the sand control of small cased wells mainly adopts chemical sand control, which is prone to formation pollution, blockage and imperfect perforation.

At the same time, as mining enters the later stage, the water content and liquid production intensity of small cased wells gradually increase, and it becomes more and more difficult for chemical sand control to meet production requirements.

Therefore, the demand for using low-cost small casing-hanging sand filter tubes for sand control in small cased wells is becoming stronger and stronger. However, conventional packers are easily stuck in the well for sand control with small casing-hanging sand filter tubes, and it is difficult to salvage in later operations. , which has also become an important factor affecting the implementation in small cased wells, because there has been no special fishing tool for small-diameter packers in China

[0005] The existing fishing tools for downhole tubing strings in small cased wells are fished by using the box and packer in the tubing short connection. The thread is prone to damage during the process. Once the thread is damaged, it will be completely impossible to salvage. Therefore, this method has great safety hazards and construction risks, and needs to be improved.

[0006] At present, small casing chemical sand control can no longer meet the production needs, and it is urgent to develop a small casing mechanical sand control implementation method to solve the above problems

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