A telescopic adjustment pipe and a water-mixed pipe string having the telescopic adjustment pipe

Abstract

The invention provides a telescopic adjusting pipe and a watering tubular column with the same. The telescopic adjusting pipe comprises a center pipe, a casing and an upper coupling which is connected to the upper end of the center pipe. The center pipe is sleeved with the casing. An outer thread of the center pipe meshes with an inner thread of the casing. A lower end opening of the upper coupling communicates with an upper opening of the center pipe. The telescopic adjusting pipe further comprises upper outer barrels, lower outer barrels, a lower short section and at least one seal ring which is arranged between the upper end of the inner walls of the upper outer barrels and the outer wall of the center pipe. The center pipe is sleeved with all the upper outer barrels and the lower outer barrels at intervals. The lower ends of the upper outer barrels are connected to the upper end of the casing. The upper ends of the lower outer barrels are connected to the lower end of the casing. The upper end of the lower short section is connected to the lower ends of the lower outer barrels. An upper end opening of the lower short section communicates with lower openings of the lower outer barrels. The upper end of the center pipe extends out of the upper outer barrels. The lower end of the center pipe is located in an outer casing assembly. Through an upward thread and a downward thread of the center pipe, the upper end of the center pipe extends out upwards and retracts downwards. According to the telescopic adjusting pipe and the watering tubular column with the same, the length of the telescopic adjusting pipe can be adjusted so as to adapt to the height of a well mouth.

Description

technical field [0001] The invention relates to the technical field of water-mixed oil recovery, in particular to a telescopic adjustment pipe and a water-mixed pipe string with the telescopic adjustment pipe. Background technique [0002] Due to the high wax content and high freezing point of high pour point oil, during the extraction and lifting process, the heat loss along the way will make the temperature of the produced liquid drop continuously, the condensation of high pour point oil will increase sharply, and the flow resistance will increase or even fail to flow. The high-condensation oil solidifies before reaching the wellhead, and after solidification, the high-condensation oil does not flow, so that the sucker rod cannot move up and down, causing the well to get stuck. In actual production, oil production can only be lifted after the wellbore fluid temperature is higher than a certain temperature above the freezing point by heating along the process. [0003] At ...

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