Dynamic Erosion Mechanism of Punched Sleeve in Water-Producing Gas Wells
In water-producing gas wells,the punched screen is subjected to both corrosion and erosion wears,making its service life much shorter than expected.In order to analyze the reasons for the rapid failure of punched screen in water-producing gas wells,a laboratory corrosion test was conducted under simulated corrosion environment of water-containing gas wells,and the distribution model of 2 flaws of punched sleeve was built and solved.Then,taking the corrosion rate as the dynamic grid rate,the erosion mechanism of punched sleeve under different flaw depths and volume fractions of water was explored.The results show that when the water cut increases from 0 to 100%,the corrosion rate increases from 0.011 5 mm/a to 0.039 9 mm/a,and the section of the corro-sion pit is circular.When the flaw is located in the middle area of the edge,the maximum erosion wear amount is distributed at the flaw location.When the flaw is in other areas,the maximum erosion wear amount is distributed in the non-flaw areas at the four corners of the edge.The maximum erosion wear rate is directly proportional to the flaw depth and the volume fraction of water,and the combined action of corrosion and erosion is the reason for the significant reduction in service life of the punched screen in water-producing gas wells.The conclusions provide theoretical reference for improving the service life of punched screen.
water-producing gas wellpunched sleevesand control screenS13Crerosion wearcorro-sion ratedynamic grid
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NSTL
万方数据
维普
