Separate layer water injection system of small cased well

Abstract

The invention relates to a separate layer water injection system of a small cased well. A water injection pipe column is inserted into an inner cavity of a small bushing, the upper end of the water injection pipe column is connected to a large diameter section of the pipe column by means of reducing, intelligent water distributors are separately arranged in positions, corresponding to oil layers,in the water injection pipe column, and packers are separately arranged between adjacent intelligent water distributors. The water distributors are controlled by a ground control system, a coming water manual switching valve is mounted on a coming water branch pipe in the ground control system, an upstream pressure transmitter is mounted upstream of the coming water manual switching valve, an intelligent water regulating valve is mounted downstream, the downstream of the intelligent water regulating valve is connected to a water injection manual switching valve, an outlet of the water injection manual switching valve is connected to a water injection pipe, a downstream pressure transmitter is mounted at the outlet of the intelligent water regulating valve, signal lines of the two pressuretransmitters and the intelligent water regulating valve are connected to a ground controller, a bypass drain pipe is connected to the water injection pipe, and an electric pressure relief valve is arranged at the inlet of the bypass drain pipe. The control system can achieve bidirectional pressure wave communication of underground equipment and downhole instruments.

Description

technical field [0001] The invention relates to a layered water injection well in the field of petroleum and natural gas, in particular to a layered water injection system for a small cased well, and belongs to the technical field of layered water injection. Background technique [0002] Layered water injection is a technological measure to implement water injection through the isolation of the packer and the control of the water nozzle of the water distributor, so that the high, medium and low permeability formations can play the role of water injection, so as to realize the adjustment of the conflict between oilfield layers and improve the water injection sweep coefficient. [0003] Through hydraulic, mechanical or self-sealing action, the packer makes the expansion rubber tube bulge and seal the annular space of the oil sleeve, separating the upper and lower oil layers. With the increase of oilfield development years, more and more wells with casing deformation and casing...

AI Technical Summary

Problems solved by technology

The one-way pressure wave communication can only send wave code commands from the ground to the downhole, and the downhole intelligent water distributor receives the commands to switch the water nozzle or change the distribution, but the one-way pressure wave communication cannot obtain the real-time flow rate and formation pressure of each layer of the downhole on the ground. data

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