Wellhead sealing device

Abstract

The invention discloses a wellhead sealing device. The wellhead sealing device comprises a shell which can be arranged outside a sucker rod in a sleeving mode, a plurality of sealing rings located ina first sealing space and a second sealing space and elastic pieces arranged on the sealing rings; the shell is provided with the first sealing space and the second sealing space; the first sealing space is located above the second sealing space; the cross-sectional area of one of the first sealing space and the second sealing space is gradually increased from top to bottom, and the cross-sectional area of the other one of the first sealing space and the second sealing space is gradually reduced from top to bottom; the multiple sealing rings are up-down sequentially laminated and arrayed so asto be arranged outside the sucker rod in a sleeving mode, the sealing rings are provided with at least two parts separated from each other in the circumferential direction, a separation gap is formedbetween the at least two parts in the circumferential direction, and the separation gaps of the at least two sealing rings are staggered in the circumferential direction; and the elastic pieces exerts acting force for shrinking the separation gaps in the circumferential direction to the sealing rings. The wellhead sealing device can play a very good sealing role on an oil well wellhead.

Description

technical field [0001] The invention relates to the field of oil recovery technology, in particular to a wellhead sealing device. Background technique [0002] At present, packing is mainly used to seal sucker rods on oil production wells. The sealing packing used is mainly asbestos packing and rubber packing. Among them, asbestos packing and rubber packing have poor wear resistance and are easy to leak. The cycle is short, and at present there is no way to make the oil well run continuously without adding packing within the cycle. [0003] In addition, the sealing effect of the existing packing sealing method is not strict, and wellhead leakage is easy to occur, which is a major problem affecting safety, environmental protection and production. Moreover, when the packing is damaged, it will not only pollute the wellhead, increase the workload, stop pumping and add packing, but also delay production, especially in sand producing wells. After stopping pumping, it is very eas...

AI Technical Summary

Problems solved by technology

[0002] At present, packing is mainly used to seal sucker rods on oil production wells. The sealing packing used is mainly asbestos packing and rubber packing. Among them, asbestos packing and rubber packing have poor wear resistance and are easy to leak. The cycle is short, and there is currently no way to make the oil well run continuously without packing during the cycle

[0003] In addition, the sealing effect of the existing packing sealing method is not strict, which is prone to wellhead leakage, which is a major problem affecting safety, environmental protection and production.

Moreover, when the packing is damaged, it will not only pollute the wellhead, increase the workload, stop pumping and add packing, but also delay production, especially in sand producing wells, which can easily cause oil well sand stuck and stop production after stopping pumping

In severe cases, operations need to be performed to remove the jam, which increases operating costs and affects oil well production

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