Sectional synchronous sampling and water exploration tubular column of multi-section fracturing horizontal well and working method thereof

Abstract

The invention discloses a sectional synchronous sampling and water exploration tubular column of a multi-section fracturing horizontal well and a working method thereof, and the tubular column is designed for realizing synchronous fast sampling and water exploration for all intervals of the horizontal well through one trip of the tubular column. The tubular column is arranged between a screwed plug and an oil well pump, and is connected with multiple stages of connecting units consisting of underground sampling switchgears and packers through oil pipes, and the underground sampling switchgear and the packer of each stage correspond to one interval respectively. The upper end of the underground sampling switchgear at the top stage is connected with the oil well pump through an oil pipe, the upper end of the oil well pump is connected with a sucker rod arranged in the oil pipe, the oil pipe is connected to a wellhead, and the sucker rod is connected with a ground pumping unit. The tubular column adopts the multi-stage underground sampling switchgears, so that sectional synchronous sampling and water exploration for multiple intervals through one trip of the tubular column can be realized, the original manner that production and water exploration for each interval are separated is converted into the manner of synchronous production and water exploration, the water exploration period can be significantly shortened, the water discharge interval can be determined, the water exploration efficiency is improved, and a reliable basis can be provided for water control and oil production enhancement measures for the horizontal well.

Description

technical field [0001] The invention relates to a multi-stage fracturing horizontal well segmented simultaneous sampling water finding pipe string and a working method thereof, which belong to the technical field of oil field recovery. Background technique [0002] At present, major oilfields in China are vigorously promoting horizontal well production technology with the core of improving reservoir production degree, increasing recovery rate, increasing single well production and reducing production cost. Due to the complex and changeable wellbore trajectory and injection-production well pattern of horizontal wells, the lithology, physical properties and reservoir fluid properties of each oil layer are different, resulting in differences in water absorption capacity, waterline advancement speed and liquid production status of each layer, resulting in Some layers break through water early, the level and direction of water breakthrough are not clear, and the productivity and ...

AI Technical Summary

Problems solved by technology

At present, the water-seeking technology of horizontal wells is not yet mature, especially the water-seeking technology of low-liquid-volume horizontal wells in low-permeability reservoirs is still in the exploration and research stage, resulting in non-targeted on-site dynamic adjustment measures and seriously affecting the development effect of horizontal wells

The existing casing completion horizontal well segmented water detection test string uses...

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