Ground pipeline for carbon-dioxide flooding during oil field exploration

Abstract

The invention discloses a ground pipeline for carbon-dioxide flooding during oil field exploration. The ground pipeline comprises a pipe body, a first flange plate, an outer thread, a lining, an arc-shaped supporting plate, a threaded column, a threaded barrel, a bearing, a mounting plate, an inner thread, a second flange plate, a one-way valve, a water inlet valve, a water inlet joint, a pipe sleeve and a pipe sleeve connecting piece. The ground pipeline comprises a pipeline fixing mechanism. During pipeline mounting, the threaded barrel, located at the bottom of a rotating pipe sleeve, on the pipeline fixing mechanism can be rotated to change the heights of the pipe body and the pipe sleeve of the pipeline relative to the ground, so that the condition that the pipeline is difficult to mount for being too large or small in height is avoided, the mounting of the whole pipeline is greatly facilitated, and the pipeline mounting efficiency is improved. The one-way valve is arranged in thepipe body. The water inlet joint is arranged on the pipe body. During carbon-dioxide flooding, water flow can enter the pipe body; and at the moment, carbon dioxide can be dissolved in water to formcarbonated water in the pipe body, so that the flooding efficiency is improved.

Description

technical field [0001] The invention relates to a surface pipeline for carbon dioxide flooding, in particular to a ground pipeline for carbon dioxide flooding in oil field development, and belongs to the technical field of carbon dioxide flooding applications. Background technique [0002] In the development of oil and gas fields, the use of water and carbon dioxide for oil displacement is the most common oil displacement technology. The carbon dioxide flooding technology is to inject carbon dioxide into the oil layer to improve the oil recovery rate of the oil field. Carbon dioxide and crude oil have good mutual solubility and can It has the advantages of significantly reducing the viscosity of crude oil, improving the mobility ratio of crude oil and water, and increasing the permeability. The higher the initial viscosity of crude oil, the greater the difference in viscosity after reduction. After the viscosity is reduced, the flow capacity of crude oil increases, which help...

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Problems solved by technology

[0003] Most of the existing surface pipelines used for carbon dioxide flooding in oilfield development do not contain pipeline fixing mechanisms. It is troublesome to install the pipelines and the installation efficiency is slow. At the same time, most of the existing surface pipelines used for carbon dioxide flooding cannot be used for water flooding. The use of pipelines makes the range of use of the device smaller, and if you want to use carbon dioxide and water to drive oil, you need to use two pipelines, and carbon dioxide can only be dissolved in water underground, which is not convenient for the use of oil displacement. insufficient

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