Novel foam liquid injecting system

Abstract

The invention discloses a novel foam liquid injecting system. The novel foam liquid injecting system comprises a nitrogen pipeline and a PLC control system; a first tee ball valve is mounted on the nitrogen pipeline and is used for dividing the certain section of the nitrogen pipeline into two branch pipelines, a foam liquid storage tank is arranged on each branch pipeline, then the two branch pipelines are combined into one pipeline, and opening and closing of the first tee ball valve is automatically controlled through the PLC control system. According to the novel foam liquid injecting system, kinetic energy of nitrogen during flowing in the pipeline, pressure of the foam liquid storage tanks and gravitational potential energy of foam liquid are fully utilized, so that the mixed foam liquid is injected and carried without using extra power, a plunger pump is successfully replaced, and the problems of high energy consumption, high cost and poor stability generated by using an original plunger pump are effectively solved; and the novel foam liquid injecting system has the characteristics of low cost, low energy consumption, good running stability, simple operation, easy arrangement and easy maintenance, and has very important practical value in the field of petroleum exploitation.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a novel foam liquid injection system. Background technique [0002] Oil is crucial to the development of the national economy, and the difficulty of oil exploration is increasing day by day. Some major oilfields in my country, such as Daqing Oilfield and Shengli Oilfield, have entered the middle and late stages of development, but it is worth noting that crude oil, which accounts for 2 / 3 of geological reserves, remains in the formation due to the limitation of mining technology. Therefore, how to further improve the oil recovery of developed oilfields becomes particularly important. [0003] Foam flooding is an oil displacement method that uses nitrogen, natural gas or other gases mixed with foaming agents to form foam as the oil displacement medium. Compared with conventional water flooding and steam flooding methods, foam flooding is stable in contact with wa...

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Problems solved by technology

[0004] In the implementation of foam flooding technology, it is a crucial process to realize nitrogen enveloping foam liquid. At present, plunger pumps are generally used to drive foam liquid into nitrogen pipelines, but since the pressure of nitrogen pipelines is 16Mpa, which is much higher than The storage pressure of the foam liquid tank is 0.5Mpa. Using the plunger pump under such a large pressure difference causes a series of problems such as high cost, high energy consumption and unstable system operation. Therefore, a new system needs to be designed to replace the plunger pump. Achieve the goals of low energy consumption, low cost, and good system operation stability

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