Pressure control type intelligent production pipe column capable of injecting acid by layer selection and production method

Abstract

The invention discloses a pressure control type intelligent production pipe column capable of injecting acid by layer selection and a production method. The production pipe column comprises an upper-section pipe column provided with an underground safety valve, a passing cable packer and an electric submersible pump, and a lower-section releasing layered pipe column provided with a releasing tool, a positioning seal, a first inserting seal, a second inserting seal and a guide screw plug; pressure control switches are arranged at a plurality of positions of the production pipe column respectively; and the production method comprises the steps of manufacturing the production pipe column, mounting the pressure control switches, putting in the releasing layered pipe column and the upper-section pipe column, remotely controlling and pressurizing, digging in turn and exploring water, acidifying at a fixed point and the like. The pressure control type intelligent production pipe column and the production method, disclosed by the invention, have the advantages that the production pipe column can work only if the releasing layered pipe column is put for one time, and an instrument or the pipe column does not need to be detached; the technical difficulty of large-inclination well layered water control and oil extracting can be effectively solved; water finding, water control, layer-adjusting production and fixed-point acidifying of different oil layers are realized through remotely controlling the pressure control switches on the ground; and the acid can effectively enter a target reservoir stratum in an acidifying process.

Description

technical field [0001] The invention relates to a layered oil recovery technology in an oil field, and more specifically, the invention relates to a pressure-controlled intelligent production string and a production method for optional layer acid injection. Background technique [0002] At present, most production wells in offshore oilfields are directional wells. When the well inclination is less than 60°, conventional sliding sleeves are often used to achieve layered production; when the well inclination is greater than 60°, such oil wells are produced in a general commingled production mode because steel wire operations cannot be run in. However, as the oilfield enters the medium-high water cut stage, the conflict between layers becomes more and more prominent, and how to realize oil recovery with layered water control has become a technical problem that needs to be solved urgently. [0003] In addition, only a general acidizing method can be used for oil well acidificat...

AI Technical Summary

Problems solved by technology

[0003] In addition, only a general acidizing method can be used for oil well acidification, but due to the large pressure difference between layers, the acid liquid cannot effectively enter the heavily polluted target reservoir, but enters the pressure deficit layer and the less polluted reservoir, so the acidizing effect is not obvious

[0004] In the existing technology, the downhole intelligent switch is used to solve the problem of layered mining in highly deviated wells, but there is no technical purpose to realize layered fixed-point acidizing

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