Analysis And Optimization Of Unblock Performance Of Downhole Throttle

At present,slip-type downhole throttling devices widely used in Sulige gas field have complicated problems in salvaging.Based on the original structure,this paper draws on the locking methods of various downhole tools and designs a new type of easy-to-unblock downhole Throttle.The finite element method is used to verify the performance of setting and placing the Throttle,and the following conclusions were obtained:1.The original structure of the easy-fishing throttling satisfies the requirements for setting and placing,and the change in the length and thickness of the jaws within a certain range has little effect on the setting and placement performance of the restrictor,and has the potential for further optimization;2.Obtain the mathematical model between the jaw length and thickness and the minimum fishing force and the maximum stress caused by the lower jaw on the jaws,the model can be given different in different jaw geometry parameters The minimum fishing force and the predicted maximum stress on the jaws;3.The optimal parameter combination of the length and thickness of the jaws is 95.6mm and 2.9mm,the minimum fishing force of the locking mechanism of the throttle is reduced from 2.4kN to 1.9kN,and the maximum stress on the jaws is also reduced from 896 MPa.732MPa,the fishing performance of the throttle has been significantly optimized;4.the rubber Shore hardness 65,the length of the rubber 25 mm,and the gap between the rubber and the tubing 1 mm,at this time,the maximum stress applied to the rubber dropped from 12.1 MPa to 11.27 MPa,and the tubing The maximum contact stress increases from 15.5 MPa to 18.2 MPa,which provides better sealing performance and extends the service life of the rubber for ease of unsealing.