On-line injection profile-control and flooding-control method and device

Abstract

The invention relates to a method and a device for injecting profile control online. The method includes that a plugging agent is injected in a water injection well. The plugging agent injected in the water injection well is injected online and the steps are that: (A) the plugging agent is stored into a liquid storage tank; (B) the plugging agent is simultaneously injected along with the injected water by a special injection device; (C) the plugging agent is mixed into an online water injection pipeline through a metering plunger pump; (D) the plugging agent is mixed with the injected water in the water injection pipeline, injected into the well together and reach an oil layer; (E) the total injecting flow and injecting pressure on the well opening are measured by a flowmeter and a pressure gauge. The device includes the liquid storage tank, a control valve, the metering plunger pump, an injection agent tube, the water injection pipeline, a throttle valve, the flowmeter, the pressure gauge and the water injection well. One end of the injection agent tube is connected on the water injection pipeline and the other end is connected with the metering plunger pump, the control valve and the liquid storage tank in sequence. The water injection pipeline is connected with the water injection well through the throttle valve and the flowmeter. The method and the device have the function of controllable water injection and simultaneous injection and are broadly applied into the water injection technique of petroleum exploitation.

Description

1. Technical field [0001] The invention relates to an oil recovery technology method and device suitable for water well profile control and displacement control in the petroleum industry, in particular to an online injection profile control and displacement method and device. 2. Background technology [0002] At present, profile control or control and flooding oil recovery technology is an effective technical measure for stable and high crude oil production in oilfields, and its work significance is also very important. Its purpose is to control the output of oilfield water, maintain formation energy, and increase crude oil recovery factor. During the implementation of profile control or flood control technology, the method of directly pumping plugging agent into the well at the head of the water injection well is currently used on site. This construction method has the following disadvantages or deficiencies: First, it cannot be injected online, and it is necessary to stop...

AI Technical Summary

Problems solved by technology

This construction method has the following disadvantages or deficiencies: First, it cannot be injected online, and it is necessary to stop the water injection of the water injection well. , and then inject a section of plugging agent, and then inject water, etc., so often the construction displacement is large, which may cause the pressure of the water injection well to rise too fast, and cannot achieve the purpose of deep profile control or flood control; Blockage near the wellbore affects the effect of profile control and flooding

The third is that it cannot be mixed with the injection water and injected evenly; the fourth is that the profile control process is complicated, the operation labor intensity is high, and the environment is relatively harsh

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