高温气井套管性能变化对井口抬升高度的影响

井口抬升高度对高温气井管柱设计、固井设计以及地面管线设计等至关重要,但套管性能、自由段长度等因素对井口抬升高度影响显著。为阐明井口抬升机理,分析套管性能对井口抬升高度的影响,充分考虑温度对套管力学性能的影响,建立多因素作用下井口抬升高度预测模型,并分析受温度变化影响抬升高度的关键因素。利用文昌气田X井测试管柱实测数据分析不同情况下套管热膨胀系数和弹性模量对抬升高度的影响。结果表明:同时考虑热膨胀系数和弹性模量共同作用的预测模型对井口抬升高度影响最大,与现场实际最为接近,应作为工程分析的首选。研究结果对井口抬升高度预测及油气井安全生产具有重要的指导意义。

Effects of casing performance change on wellhead growth height in high temperature gas well

Wellhead growth height is critical for high temperature gas well string design, cementing design and ground pipeline design, but casing performance, free section length and other factors have a significant impact on wellhead growth height. In order to clarify the wellhead growth mechanism more clearly and analyze the influence of casing performance on wellhead growth height, this paper fully considers the influence of temperature on the mechanical properties of casing, establishes a prediction model of wellhead growth under multi-factors, and the most critical factor of the growth height affected by temperature change are analyzed. The influence of casing thermal expansion coefficient and elastic modulus on the growth height under different conditions was analyzed by using the measured data of the X well test string of Wenchang gas field. The results show that the prediction model considering the combination of thermal expansion coefficient and elastic modulus has the greatest influence on the wellhead growth, which is the closest to the actual situation, and should be the first choice for engineering analysis. The research results have important guiding significance for the prediction of wellhead growth and the safe production of oil and gas wells.