Insertion pipe type release separate-layer water injection string and operation process thereof

Abstract

The invention relates to an oil field separate-layer water injection process and a matched tool, in particular to an insertion pipe type release separate-layer water injection string and an operation process thereof. The insertion pipe type release separate-layer water injection string is formed by a conventional separate injection tool string, an intubation tube connector and a string stabilizer; and the intubation tube connector and the string stabilizer are sequentially arranged at the upper part of the conventional separate injection tool string. According to the invention, by anchoring of a release and sealed water injection of an intubation tube, the force condition of the separate injection string is changed; a separated upper blank tubing is suspended at a wellhead; the separated separate injection tool string is anchored and suspended on the string stabilizer; the blank tubing at the upper part is in intubation tube seal fit with the string stabilizer and the separate injection tool string at the lower part without being in screwed connection with the string stabilizer and the separate injection tool string at the lower part; the hazard to a packer rubber sleeve at the lower part, which is caused by vermiculation of the string at the upper part when water injection pressure and temperature fluctuate, is fundamentally eliminated; the string stabilizer is released step by step; and the difficult problem that the release string cannot be pulled out is solved. The water injection tool is simply manufactured, is convenient to operate and has high universality.

Description

technical field [0001] The invention relates to an oil field layered water injection process and supporting tools, in particular to an intubation-type hands-off layered water injection string and an operating process thereof. Background technique [0002] Layered water injection means that in the same water injection well, the oil layer is divided into several layers by using a packer, so that while strengthening the water injection in the medium and low permeability oil layers, the water injection pressure can be reduced by adjusting the throttling loss of the downhole water nozzle. In order to adjust the difference in water absorption of oil layers with different permeability, control the water injection in high permeability oil layers. [0003] In the process of layered water injection in oilfields, the conventional eccentric dispensing string combined with Y341 packer and eccentric water distributor and the conventional concentric dispensing string combined with Y341 pac...

AI Technical Summary

Problems solved by technology

The main problem of the conventional split injection string is that when the water injection pressure and temperature fluctuate, it is easy to produce string creep, which will eventually cause damage to the packer rubber sleeve, and the deeper the well, the more obvious this phenomenon

[0006] For this reason, some technicians use a dispensing string composed of a buffer, a Y341 packer, and a water distributor, which to a certain extent alleviates the impact of string peristalsis on the sealability of the packer, but this dispensing string is stable. Poor performance, did not fundamentally eliminate the impact of string creep caused by water injection pressure and temperature changes on packer tightness

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