一种气井油管柱接头泄漏深度诊断方法

By testing the annular pressure and stabilization time at the wellhead of the gas well, and combining the recursive method and the least squares method, the problems of high cost, high efficiency and low efficiency in the existing technology are solved, and the leakage depth of the gas well tubing string joint is quickly and reliably diagnosed.

CN120542322BActive Publication Date: 2026-07-17CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2025-05-29
Publication Date
2026-07-17

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Abstract

本发明涉及气井安全生产技术领域，具体涉及一种气井油管柱接头泄漏深度诊断方法：根据完井投产初始时刻油管柱内压与油套环空压力，确定油管柱接头泄漏的最大可能深度，采用递推法，基于时间步内气体泄漏速率稳定和泄漏井深处气体状态计算泄漏气体物质的量，再考虑泄漏气体在井口的聚集和状态计算环空带压值，并据此修正气体泄漏速率，当前后时间步的泄漏速率差值在设定误差范围内时停止递推，获取不同泄漏井深下的环空带压最终稳定值及稳定时间，绘制诊断图版并拟合泄漏深度预测模型，将实际测试的油套环空带压最终稳定值及稳定时间代入模型，即可预测油管柱接头泄漏深度，本技术方案可实现气井不停产状态下的快速、可靠、经济诊断。
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