Method for evaluating residual strength of wellhead device

• Main Authors: YAN HONGJUAN, LI BOLUN, HOU WANYONG, MENG YONGLI, PENG HUI, QIU FUSHOU, WANG HONG, FU DENGWEI, NIJIATI SAIMAITI
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• Subjects: CALCULATING; COMPUTING; COUNTING; DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR

The invention provides a method for evaluating the residual strength of a wellhead device. The method comprises the steps that S10, the actual wall thickness of a preset position of a preset part of the wellhead device is obtained; S20, the designed wall thickness of a preset component of the wellhead device is obtained; S30, the actual wall thickness is compared with the designed wall thickness, if the actual wall thickness is smaller than the designed wall thickness, it is judged that the wall thickness is unqualified, and if the actual wall thickness is larger than or equal to the designed wall thickness, the residual life is obtained according to the formula that v1 = v0 + v2 and dn = delta-delta n, Tn is the residual life, ni is the safety coefficient, dn is the critical wall thickness reduction amount, v1 is the corrosion rate, v0 is the external corrosion rate, v2 is the internal corrosion rate, delta is the designed wall thickness, and delta n is the actual wall thickness. By means of the technical sc