3.5-inch sidetracked slim hole sectioned fracturing pipe column

Abstract

The invention discloses a 3.5-inch sidetracked slim hole sectioned fracturing pipe column. The 3.5-inch sidetracked slim hole sectioned fracturing pipe column comprises an oil tube, a strengthening nipple, a hydraulic anchor, a backwash valve, a packer, a setting ball seat, a sandblaster, a ball receiving basket, a 3.5-inch sidetracking small casing and an original casing. Windowing is conducted in the original casing for drilling a slim hole; then, the 3.5-inch sidetracking small casing is used for well cementing and completion; the strengthening nipple, the hydraulic anchor, the backwash valve, the packer, the setting ball seat, the sandblaster and the ball receiving basket are all located in the 3.5-inch sidetracking small casing, the oil tube, an adapter nipple and a safe releasing subare all located in the original casing, and the oil tube, the safe releasing sub, the adapter nipple, the strengthening nipple, the hydraulic anchor, the backwash valve, the packer, the setting ballseat, the sandblaster and the ball receiving basket communicate sequentially from top to bottom; and fire perforating and reperforating, fracturing, and plugging through sanding filling or through a run bridge plug are carried out sequentially in the 3.5-inch sidetracking small casing from bottom to top till fracturing of all layer sections is completed, wherein a perforated section is located below the ball receiving basket. Through the pipe column, sectioned fracturing can be achieved, and the drilling tool jamming risk is small.

Description

technical field [0001] The invention relates to a staged fracturing pipe string, in particular to a staged fracturing pipe string for a 3.5-inch sidetracked slim hole. Background technique [0002] As most oil reservoirs in China are gradually entering the middle and late stage of development, it is extremely urgent to effectively produce remaining oil in the formation and fully tap the potential of the reservoir. It is particularly urgent to maintain stable production in mature areas at low cost. Considering factors such as reducing drilling investment, land acquisition costs, and ground equipment costs, in the original As an effective technology, sidetracking new wellbore in old well intervals has been paid more and more attention. For reservoirs with many layers, it is of great significance to carry out sidetracking slimhole staged fracturing to fully tap the reservoir potential. Domestic Changqing, Tuha and other oilfields have begun to explore this technology, but there...

AI Technical Summary

Problems solved by technology

For reservoirs with many layers, it is of great significance to carry out sidetracking slimhole staged fracturing to fully tap the reservoir potential. Domestic Changqing, Tuha and other oilfields have begun to explore this technology, but there is no staged sidetracking slimhole staged fracturing. Reports on Crack Transformation

[0003] Conventional slim hole fracturing mainly has the following disadvantages: usually single-layer fracturing or multi-layer combined fracturing cannot achieve effective staged fracturing; the risk of pipe sticking is high, the treatment is difficult, and the supporting technology is immature

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