Preset cable directly controlled type electronic-control layered polymer injection technique pipe and polymer injection method

Abstract

The invention relates to the technical field of layered polymer injection wells, and particularly relates to a preset cable directly controlled type electronic-control layered polymer injection technique pipe and a polymer injection method. The technique pipe comprises a casing, wherein an oil tube is arranged inside the casing; an annulus between the casing and the oil tube is divided into different layers by a plurality of cable-passing well-washable packers; a steel tube single-core cable penetrates through the cable-passing well-washable packers; a flow direct reading type underground electronic-control polymer injection device is arranged between each two adjacent packers; adjustment of injection rate of the flow direct reading type underground electronic-control polymer injection devices is controlled by a ground controller; and two pressure sensors and an electromagnetic flowmeter are arranged inside each flow direct reading type underground electronic-control polymer injection device. By the polymer injection technique pipe and the polymer injection method which are provided by the invention, a ground control device can supply power for the flow direct reading type underground electronic-control polymer injection devices and control communication thereof through the steel tube single-core cable, interactive monitoring between the ground and the underground can be established, and therefore, real-time monitoring of tripping-in instruments, flow ground direct reading, direct control and pressures in front of a mouth and at the rear of the mouth is not required in a testing process.

Description

technical field [0001] The invention relates to the technical field of layered polymer injection wells, in particular to a preset cable direct-controlled electric-controlled layered polymer injection process string and a polymer injection method. Background technique [0002] Layered polymer injection wells in oilfields mainly adopt double-pipe separate injection technology, concentric separate injection technology, eccentric shuttle rod, eccentric annular pressure-reducing groove and separate mass and partial pressure injection technology. Two-layer injection can be realized, and backwashing cannot be realized. The concentric split injection process, eccentric shuttle rod, eccentric annular depressurization groove and split mass and partial pressure injection technology all have the problem of difficulty in fishing and testing. Contents of the invention [0003] (1) Technical problems to be solved [0004] The technical problem to be solved by the present invention is to...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a pre-set cable direct-controlled electronically controlled layered polymer injection process string and a polymer injection method to overcome the existing eccentric split injection process in oil field polymer injection wells in the prior art. Defects such as easy to block cards, easy to repeat test results, instability, and low deployment and control efficiency

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