Separate-layer sand blocking simultaneous production pipe string

Abstract

Disclosed is a separate-layer sand blocking simultaneous production pipe string. In order to overcome the shortcoming that due to phenomena of sand jamming, sand blocking and sand burying of an existing oil well with the serious interlayer interference, oil production cannot be smoothly carried out, an upper packer, a safety joint I, a screen pipe I, a safety joint II, a lower packer, a safety joint III, a screen pipe II and a screwed plug of the separate-layer pipe string are sequentially and fixedly connected from top to bottom through oil pipes, and an upper sealing working cylinder is fixedly arranged between the screen pipe I and the safety joint II of the separate-layer pipe string. A lower sealing working cylinder is fixedly arranged between the safety joint III and the screen pipe II, and the inner diameter of the upper sealing working cylinder and the inner diameter of the lower sealing working cylinder are smaller than the inner diameter of the oil pipes. A hollow sealing pipe is fixedly arranged at the lower end of a separate-layer oil production pump of a lifting pipe string, and the lower end of the hollow sealing pipe is always matched with an inner hole of the upper sealing working cylinder. An annulus is formed between the hollow sealing pipe and an inner hole, above the upper sealing working cylinder, of the separate-layer pipe string. The separate-layer sand blocking simultaneous production pipe string has the beneficial effects of being reasonable in structural design, and capable of avoiding the interlayer interference, and effectively improving per-well production and production aging of a sandy well.

Description

technical field [0001] The invention relates to a layered oil recovery pipe string for crude oil production, in particular to a layered sand retaining and simultaneous recovery pipe string. Background technique [0002] The geological structure of the oilfield is complex, and most blocks have problems such as long production intervals of oil wells, multiple layers, high reservoir variation coefficient, and high comprehensive water cut, which makes interlayer interference serious and crude oil extraction difficult. Through the research on the interlayer interference problem, different layered oil recovery technologies have been formed, and significant application effects have been achieved. However, for sand producing oil wells, the existing separate recovery technology is not suitable, mainly manifested as sand sticking and sand plugging , Sand buried serious, resulting in oil production can not be carried out smoothly. At present, there is an urgent need for a layered simu...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of sand stuck, sand plugged and sand buried in the existing oil wells with serious interlayer interference, which lead to the failure of oil recovery and production, and the separate production technology cannot meet the needs of production, the invention provides a layered sand retaining and simultaneous recovery pipe string

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