摘要
近年来高井深、高温高压和高含硫等苛刻腐蚀环境的油气田相继开发,对高钢级油套管需求日益增加。然而抗硫化物应力腐蚀试验的钢材强度等级增加会导致抗硫实验中加载的载荷值越来越接近材料的名义屈服强度,应力环系统的细微偏差会导致较大的实验误差。通过试验,分析了应力环在恒载荷试验中存在的主要问题,其中应力环体位移-载荷曲线偏移和附加弯矩(扭矩)是应力环恒载荷结果离散度大的主要原因。为有效解决这些问题,自主研发了带有更精准砝码载荷加载和自动调心装置的六头砝码式恒载荷试验机,经试验证实其试验结果较应力环系统更具稳定性和可靠性。此外,结合恒载荷(A法)和双悬臂梁试验(D法)特点,对油套管抗SSC试验方法给出了合理建议。
More and more HPHT oil and gas fields containing H_2S have been exploited in recent years,which lead to the increasing demand for high-grade tubing and casing. However,the loaded stress is more and more close to the nominal yield strength of materials during SSC tests with the steel grade increasing. Then the slight deviation of the proof ring system could lead to large experimental error. The main problems of proof ring in the experiments with constant load is anelyzed. The result shows that deviation of the proof ring displacement-loading curve and the additional bending moment are the primary causes that resulted in the large discrete degree of experimental results. In order to solve the problems,the 6-head-constant loading test machine is developed with the device of counter poise loading and automatic centering. The experimental results confirm that the results of new developed constant-loading machine are more stable and reliable compared with proof ring device. In addition,the reasonable suggestions about the SCC test methods of tubing and casing are given.
出处
《石油管材与仪器》
2017年第4期21-25,共5页
Petroleum Tubular Goods & Instruments
