青海油田三厂硫化氢形成机理及腐蚀性研究

对油气田硫化氢生成机理进行归类分析，结合青海油田采油三厂硫化氢井的分布及成藏特征、地质因素，认为该地区油井硫化氢是由于硫酸盐热化学还原反应（TSR）形成的。根据三厂硫化氢浓度及现场工况进行腐蚀性研究，结果表明，青海油田采油三厂硫化氢对钢材20#和N80的腐蚀属于轻度到中度，腐蚀产物以Fe、Cl、S、Mn元素为主，腐蚀机理为氯离子破坏腐蚀产物膜以及硫化氢的电化学腐蚀作用。

DOWN HOLE FLOW MEASUREMENT BASED ON VENTURI

The metering and controlling of down hole flow have become an important and indispensable technology in oilfield development and the intelligent oilfield technology，the correlative data which are measured by them can provide a reliable theoretical basis for the production and management of the oilfield.Bases on the metering technology of three phase mixed measurement the working principles of the down hole Venturi flow measurement is introduced in this paper，the working process discussed and a new flow measurement device which can adapt to the complex down hole environment developed，especially，the calculation of the hardware part clearly derived.This device，whose structure is simple，no plugin is needed，no interference with the fluid flow with a little pressure loss，it is not apt to be affected by the change of fluid properties，is easy to install，safe and reliable，high in precision and suitable for down hole flow measurement and control.