Fracturing-extraction well head device with combined sealing, directional separation and abrasion resistance

Abstract

The invention discloses a fracturing-extraction well head device with combined sealing, directional separation and abrasion resistance. The fracturing-extraction well head device is composed of a casing joint piece, a tubing head, a Christmas tree, a flat valve, a connecting flange, a sealing element and a coupling piece and is characterized in that an upper end and a lower end of an oil tube cross in the tubing head are flanges, the left side and the right side of the oil tube cross protrude in a diamond mode, and side channels on the left side and right side both incline downward and are intersected with an upper main channel and a lower main channel in a acute-angle mode. On surfaces of an upper end and the outer circle of a hanger component, combined sealing structures that two metal sealing rings are located at the top and the bottom and three rubber sealing rings are located in the middle are adopted. A hard alloy layer is arranged on the surface of the outer circle, located in a side channel opening of the oil tube cross (4), of a tubing nipple (5), and the tubing nipple is connected with the lower end of the hanger component in a linkage mode. In addition, a seal cartridge is further installed in a channel opening of a juncture between the flange at the lower end and a casing flange. The fracturing-extraction well head device has the advantages of decomposing fracturing fluid washing force, improving the performance of the abrasion resistance of parts, being reliable and safe in the combined sealing enabling a sealing backing ring to be prevented from being damaged and the like, and is especially suitable for being used in a well mouth for extracting gas by high-temperature fracturing.

Description

technical field [0001] The invention relates to a wellhead device in petroleum machinery and fracturing drilling equipment. Background technique [0002] The wellhead device is an important equipment for oil and natural gas extraction. It usually consists of three parts: casing connectors, tubing heads and Christmas trees. It is used to connect casing strings, tubing strings and oil and gas pipelines. It can be used as a seal between oil pipes to control wellhead pressure and regulate oil and gas flow; it can also be used in special operations such as acidizing, fracturing, water injection, gas injection production or testing. In the existing fracturing production wellhead device, the tubing spool generally meets vertically, and the fracturing fluid (containing sand grains) enters the annular space between the tubing and the casing from the horizontal direction on both sides of the tubing spool, and is suspended on the tubing spool. The oil pipe inside will be directly scou...

AI Technical Summary

Problems solved by technology

In the existing fracturing production wellhead device, the tubing spool generally meets vertically, and the fracturing fluid (containing sand grains) enters the annular space between the tubing and the casing from the horizontal direction on both sides of the tubing spool, and is suspended on the tubing spool. The tubing inside will be directly scoured, which will cause the tubing to wear out rapidly, and even cause tubing fracture accidents, affecting fracturing operations and oil and gas well production

In addition, the seals used in the hangers in the existing wellhead devices are mostly rubber seals, which have poor performance in high pressure resistance, corrosion resistance, and damage resistance, and accidents are likely to occur after damage

Therefore, it does not perform well when used in oil and gas wells with high pressure, strong erosion and strong corrosion.

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