一种用于油气井持气率测量的高可靠性光纤探针

A High-reliability Optical Fiber Probe for Void Fraction Measurement of Oil and Gas Wells

摘要:

针对油气井下油气水三相流的持气率测量,设计开发了一种高可靠性的光纤探针。探针敏感探头采用锥形蓝宝石结构,蓝宝石敏感探头与过渡管,以及过渡管与保护套管间均采用金基焊料焊接密封。对研制的光纤探针进行了可靠性实验和油气水三相流持气率测试,结果表明,该光纤探针可以承受高温(150℃)、高压(100MPa)环境,具有较高可靠性。管柱内的油气水三相流呈段塞流型,持气率为46%。该研究验证了光纤探针应用于油气井持气率测量的可行性,为后续的工程应用推广提供了理论依据和实际指导。

Abstract:

A high-reliability optical fiber probe was designed and developed for the void fraction measurement of the oil-gas-water three-phase flow in oil and gas wells, for which, a conical sapphire structure was used as the sensitive tip of the probe. The gold-based solder was exploited in order to seal the sensitive tip and the transition tube, as well as the transition tube and the protective tube. Experiments were carried out to test the reliability and void fraction, and the results show that the designed optical fiber probe is able to withstand high temperature (150℃) and high pressure (100MPa) with a high reliability. In the pipe string, the void fraction of the three-phase slug flow is 46%. The research results not only verify the feasibility of using optical fiber probes to measure void fraction of oil and gas wells, but also provide theoretical basis and practical guidance for the follow-up engineering application.