A supercritical carbon dioxide pulse jet oil pipe cleaning device and method

Abstract

The invention discloses a fouling cleaning device and method for a supercritical carbon dioxide pulse jet flow oil pipe. Supercritical carbon dioxide pulse jet flow is adopted for cleaning fouling of the inner wall and the outer wall of the oil pipe. First, gasified carbon dioxide is charged into a storage device and cooled through a refrigerating device to be liquefied and stored in a storage tank, the liquefied carbon dioxide in the storage tank is heated through a heating device to be supercritical carbon dioxide after being pressurized through a high-pressure pump, and then high-speed supercritical carbon dioxide pulse jet flow with pulse frequency being 30-80 Hz is formed through self-oscillation pulse spray nozzles on the end cover and the inner wall of a fouling cleaning chamber and used for carrying out pulse flushing on the inner wall and the outer wall of the oil pipe; the fouling on the walls of the pipe is easy to clean after being dissolved with the supercritical carbon dioxide and being subjected to pulse flushing with the pulse jet flow in a combined mode; after fouling cleaning, the supercritical carbon dioxide is subjected to pressure reduction through a separator and converted into gasified carbon dioxide to be separated from the fouling, and fouling cleaning is completed; the gasified carbon dioxide is reused, and the fouling is recycled. The device and method save energy, are environmentally friendly, safe and efficient, and the fouling is easy to separate and recycle.

Description

technical field [0001] The invention belongs to the field of oil pipe cleaning equipment and technology in oil and gas engineering, and relates to a supercritical carbon dioxide pulse jet oil pipe cleaning device and method. Background technique [0002] In the oil and gas industry, tubing is a very common downhole tool, and its usage is large, which directly affects the cost of oil production. After the tubing has been working for a certain period of time, oil, wax and other impurities will adhere to the inner and outer walls, which will reduce the production efficiency of the oil well, or even stop production, requiring workover to clean and repair the tubing. In order to avoid downhole accidents, the oil pipe must be lifted out of the oil well before cleaning. How to improve the effect and efficiency of oil pipe cleaning and reduce the cost of cleaning, technicians have been working hard to explore better technology. [0003] At present, the commonly used oil pipe clean...

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Problems solved by technology

The disadvantages of hot immersion decontamination are high energy consumption and low energy efficiency in an open environment. After adding chemical reagents, the environment is seriously polluted and the working conditions are harsh. The decontamination effect for thicker dirt is not ideal, and the discharge of decontamination liquid is limited; The disadvantages of the intermediate frequency heating mechanical method are large power consumption, high cost, unsatisfactory cleaning effect, and frequent replacement of wire brushes; the main disadvantage of high-pressure water jet cleaning is the cleaning effect on oily dirt with high viscosity or high wax content Not ideal, especially in winter

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