SLIDING COUPLING Russian patent published in 2021 - IPC E21B34/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the technical field of oil and gas well development and reservoir stimulation. The sliding coupling contains an upper connector, a lower connector, an external case, an internal sleeve and a shear pin. The upper connector and the lower connector are respectively connected to the two ends of the external case. The internal sleeve is fixed in the external case by means of the shear pin. A hole for the flow direction is made in the external case. The internal sleeve can open or close the hole for the flow direction. At least one groove for engagement with at least one corresponding gear element on the tool for opening the sliding coupling is located along the axial direction in the internal sleeve. An erosion-resistant ring is built into the groove, and the inner diameter of this erosion-resistant ring is larger than the inner diameter of the internal sleeve.

EFFECT: preventing the destruction of the sliding coupling by countering the effect of erosion that occurs when a high-speed sand-conducting fluid passes through the groove on the internal sleeve.

25 cl, 27 dwg