Spiral type detachable cut slit inclined wire sand-filtering pipe

Abstract

The invention provides a spiral type detachable cut slit inclined wire sand-filtering pipe which is used for sand prevention of an oil-gas well and a heavy oil well. According to the sand-filtering pipe, an inclined wire coarse sand-filtering technology and a cut slit fine sand-filtering technology are organically combined for the first time, double sand filtering is achieved, and the sand-filtering pipe has the advantages of being low in cost, convenient to operate, good in sand prevention effect and wide in applied range and preventing sand from blocking a pump. Well liquid acceleration for avoiding deposition of sand particles is achieved due to a special variable cross-section flow channel of a liquid guiding flowing device; a V-shaped inclined wire cage sleeve is reinforced through a drainage cover, a drainage ring and a spiral rib, the sand-filtering pipe is high in strength, rigidity and extrusion and friction resistance, and wire dropping and the damage to a sleeve cannot occur easily. Wire slits and cut slits have the self-cleaning effect due to a trapezoidal inclined wire and the sector shapes of the cut slits, the spiral rib and the inclined wire are spirally arranged, a spiral rib slit and the wire slits are narrow in outside and wide in inside, the spiral rib and the inclined wire cage sleeve have a self-cleaning function, the inclined wire cage sleeve is detachable, and the sand-filtering pipe is convenient to replace or clean. Well liquid is led to the sand-filtering pipe through the drainage cover, the sand particles are led out through the drainage ring, and the deposited sand particles can be collected through the sand-filtering pipe.

Description

technical field [0001] The invention relates to an underground sand control device for oil and gas well production, in particular to a sand filter tube suitable for sand control in heavy oil wells. Background technique [0002] At present, the production of major oil and gas fields in my country has begun to enter the middle and late stage. The phenomenon of poor wellbore structure, high water content in oil, and heavy oil is very common. With the production of heavy oil and low-grade reservoirs, the reservoir conditions have undergone major changes, and "sand damage" such as sand-buried oil layers, sand-stuck oil pipes, sand-buried pumps, sand-stuck pumps, and sand-milled oil pumps has become more serious and complicated. [0003] At present, sand control of oil and gas wells and heavy oil wells at home and abroad is mainly based on mechanical sand control. Commonly used mechanical sand control methods include wire-wound screen, slotted liner, mechanical sand filter + gravel...

AI Technical Summary

Problems solved by technology

[0005] In order to effectively solve the problem of sand production in oil and gas wells and heavy oil wells and overcome the shortcomings of existing mechanical sand filter tubes and chemical sand control technologies, the purpose of the present invention is to develop a new type of spiral adjustable filter for sand control in oil and gas wells and heavy oil wells. Disassemble the slotted wire sand filter tube

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