A subdivided layer water-mixed oil production string

Abstract

The invention relates to a subdivided layer watered oil extraction pipe column for high-salinity oil deposit. The subdivided layer watered oil extraction pipe column comprises an oil pipe, wherein a watered packer is arranged at the lower end of the oil pipe; the watered packer is connected with a watered oil pumping pump and a sealing insertion pipe sequentially from top down; the sealing insertion pipe is connected to a lower joint at the lower end of the watered oil pumping pump and is inserted into a sealing cylinder; a small oil pipe is arranged in the sealing insertion pipe; the small oil pipe is connected to an oil extraction short section at the lower end of the watered oil pumping pump; a hanging packer is connected to the lower part of the sealing cylinder; and a constant pressure switch, a water plugging packer and a setting ball base are connected to the lower end of the hanging packer sequentially from top down. By the subdivided layer watered oil extraction pipe column, the overflowing area of a watered channel is increased, the anti-plugging performance of the pipe column is enhanced, the concentration of output liquid in high-salinity oil deposit strata is reduced effectively, and the plugging is prevented; and the communication between productive layers and upper and lower plugging layers can be isolated effectively, and the subdivided layer watered oil extraction of high-salinity oil deposit thin oil layers is realized, so the problem of selective extraction cannot be realized is solved.

Description

technical field [0001] The invention relates to a downhole tool assembly for oil well production in the field of petroleum and natural gas, in particular to a subdivided-layer water-mixed oil production string used in high salinity oil reservoirs. Background technique [0002] In the production process of high-salinity reservoirs with high salinity of formation produced fluid, problems such as gypsum formation, salt precipitation and scaling in oil wells will seriously affect the normal production of oil fields. In order to avoid pump jamming, salt plugging and casing corrosion, it is generally necessary to add clean water to reduce the concentration of the produced fluid in the exploitation of such reservoirs. In addition, some high-salinity oil reservoirs are characterized by multiple layers, thin layers, and serious heterogeneity between layers. Poor and uneven oil layer output is also very serious, so it is necessary to use subdivided layers for mining. [0003] In ord...

AI Technical Summary

Problems solved by technology

Since the pipe string uses small-diameter capillary stainless steel pipe as the water mixing channel, the installation is complicated and it is easy to be blocked during the water mixing process, and the maintenance cost is high. subdivision layer mining

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