A tubing suitable for foam drainage and gas recovery in highly deviated wells

Abstract

The invention discloses an oil pipe suitable for foam drainage and gas recovery in highly inclined wells. The upper and lower ends of the upper and lower ends of the inner cylinder have mutually matching thread fitting structures, and one side of the inner wall of the inner cylinder has arc-shaped protrusions distributed along its length direction, and the arc-shaped protrusions protrude inward along the radial direction of the inner cylinder. The highest point of the protrusion is close to the upper end of the arc-shaped protrusion. To optimize the tubing structure, the concept of static mixing, which is opposite to the traditional dynamic stirring and mixing theory, is mainly used to make full use of the stratification characteristics of gas and liquid in highly deviated well sections, and to conduct fluid guidance and convergence in all directions with a static structure, so that the gas and liquid flow in this well. In the tubing in the well section, the rising process can continue to mix, and the mixing is more uniform and thorough, which greatly improves the gas liquid-carrying capacity, and at the same time reduces the production pressure loss, which is conducive to ensuring normal production.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation tools, in particular to an oil pipe suitable for foam drainage and gas exploitation in highly deviated wells. Background technique [0002] Foam drainage gas recovery is one of the main means of natural gas extraction. It mainly produces water foam at the bottom of the well by physical and chemical methods. Driven by the airflow, the bottom hole liquid is taken away from the bottom of the well by the water foam, so as to clean the bottom of the well. The purpose of restoring normal production, but due to the influence of gas well production, liquid accumulation, contact area and other factors, after adding the foaming agent, there are often poor foaming effect, poor liquid-carrying effect, and low drainage efficiency, requiring some physical devices. , to physically stir the bubbles. [0003] In the existing research, dynamic stirring devices are mainly used, such as the patent number "CN2...

AI Technical Summary

Problems solved by technology

[0004] However, when the production well is a highly deviated well and the gas and liquid are transported in the downhole tubing, the separation of the gas and liquid in the tubing in the inclined section is serious because the tubing has a smooth tube structure. The capacity is also relatively weak, and the gas-liquid must be continuously mixed. If the stirring device of the aforementioned scheme is used, it will cause a large pressure loss along the process, resulting in insufficient pressure and affecting normal production.

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