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由于采气井口内气、液的不断冲刷 ,温度、压力、振动、硫化氢腐蚀、日晒雨淋、闸阀的频繁开关和其本身的加工精度与质量等因素的影响 ,使采气井口不可避免地发生密封失效问题 ,严重威胁着天然气井的正常生产。文章分析了采气井口密封失效的原因 ,介绍了在不影响正常生产的动态条件下 ,消除密封失效的操作技术 ,论述了采气井口法兰泄漏、1、2和 3号闸阀泄漏及其以内本体砂眼泄漏、特殊四通顶丝泄漏、套管头密封问题及CQ型改制替换CYb型闸阀的具体方法。
Due to the gas and liquid in the gas wellhead constantly washing, temperature, pressure, vibration, hydrogen sulfide corrosion, sun and rain, gate valve frequent switching and its own processing accuracy and quality and other factors, the gas wellhead inevitable Seal failure occurred, a serious threat to the normal production of natural gas wells. This paper analyzes the reason of the failure of the gas wellhead seal, introduces the operation technique of eliminating the seal failure under the dynamic conditions that do not affect the normal production, discusses the flange leakage of the gas wellhead, the leakage of the No.1, The body trachoma leakage, the special four-way jacking wire leakage, the problem of casing head sealing and CQ-type replacement of CYb-type gate valve specific methods.