Simultaneous Sampling and Water-seeking Pipe String in Multi-stage Fracturing Horizontal Well and Its Working Method

Abstract

The invention discloses a multi-stage fracturing horizontal well segmented simultaneous sampling water finding pipe string and a working method thereof, which are designed for realizing simultaneous rapid sampling and water finding in each layer segment of a pipe string horizontal well. The tubing string is between the plug and the oil well pump, and is connected to a multi-stage connection unit consisting of downhole sampling switches and packers through tubing, and each level of downhole sampling switches and packers corresponds to an interval. The upper end of the top downhole sampling switch is connected to the oil pump through the oil pipe, the upper end of the oil pump is connected to the sucker rod in the oil pipe, the oil pipe is connected to the wellhead, and the sucker rod is connected to the ground pumping unit. The pipe string adopts multi-level downhole sampling switches, which can realize the simultaneous sampling and water detection test of multiple layers of a pipe string, and change the original production water detection of each layer one by one into simultaneous production sampling water detection, which can greatly shorten the production time. The water-seeking test cycle can clarify the water-producing section, improve the efficiency of water-seeking testing, and provide a reliable basis for water-controlling and oil-increasing measures for horizontal wells.

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 an intelligent switch to control the timing of each layer, and produces each layer one by one. The water content of each segment is analyzed through ground testing, and the water-producing layer is judged. It needs to be independently produced for 10 days, and the water search period is too long, which seriously affects the on-site production progress, and is not suitable for the water search needs of multi-cluster long horizontal section horizontal wells

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