摘要
超声波流量计是现阶段精度最高、通用性好、灵敏度最高的流量计,但由于超声波在钻井液中衰减很大,使其未能测出钻井液的环空返出流量。通过Urick模型研究了超声波流量计在测量钻井液流量中超声波的衰减规律,分析了传播距离、超声波频率、液体密度等因素对超声波衰减的影响。通过研究得出钻井液中固相颗粒的数量每增加1个数量级,超声波能量衰减也增加一个数量级,超声波能量衰减随钻井液中固相颗粒直径、钻井液密度、传播距离的增加而增大,超声波频率越大,超声波能量衰减越快。该研究结果为超声波在钻井液测量中的进一步应用提供了理论基础。
At present, the return of drilling mud is measured by target type meter, but the result is not very accurate because of environment. The ultrasonic flowmeter is the most accurate, normal and sensitive apparatus, but the return flow of drilling mud can not be measured by ultrasonic flowmeter because of the huge ultrasonic attenuation in drilling fluid. The ultrasonic attenuation law was researched with the Urick Model when the flow of drilling fluid was measured by ultrasonic flowmeter. The effects of the factors on ultrasonic attenuation were analyzed, such as ultrasonic propagation distance, frequency, and liquid density..It was concluded that the ultrasonic attenuation would increase by one order of magnitude with the increase of the quantity of solid-phase pellet in the drilling fluid by one order of magnitude, and the ultrasonic attenuation increased with the increase of the diameter of solid-phase particles in the drilling fluid, the drilling fluid density and the propogation distance. The larger ultrasonic frequency is, the quicker ultrasonic attenuation is.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2012年第1期57-59,共3页
Oil Drilling & Production Technology
基金
国家科技重大专项项目"深水井控及测试技术研究"(编号:2008ZX05026-001-04)资助
关键词
超声波
钻井液
衰减
频率
距离
钻井液密度
ultrasonic
drilling fluid
attenuation
frequency
distance
drilling fluid density
