随着经济全球化进程不断加快和我国油田事业的迅速发展,油田物资管理部门必须适应新的形势,实现管理创新.本文结合胜利油田物资管理工作实践,介绍了当前我国油田物资管理面临的主要问题,并且提出了相应的改进对策

Formation water production is one of the bottlenecks restricting the smooth operation in gas/air drilling.Therefore,to accurately calculate the critical water-carrying capacity under a certain gas-injection rate is essential for safe operation and prevention of complicated downhole accidents.Based on Guo's minimum kinetic energy theory,a mathematical model was set up for calculating the critical water-carrying capacity of gas in air/gas drilling.Taking into account the flow state of multi-phase fluids in the annular space after formation water influx,this model can determine the corresponding relation between air/gas injection rate and critical water-carrying capacity of air/gas.The calculation results demonstrate that a.to increase air/gas injection rate and to lower down liquid-gas interfacial tension are effective means to improve the critical water-carrying capacity of air/gas,b.when the increased air/gas injection can not meet the requirement of the liquid removal,the modes of drilling have to be transferred and the critical water-carrying volume will be enhanced by reducing the liquid-gas interfacial tension,c.the calculation of critical water-carrying capacity takes into consideration both water influx and debris carrying capacity,but when the required minimum kinetic energy of both are equivalent to each other,and the liquid-gas interfacial tension reaches the extreme value,there is no need to lower down the liquid-gas interfacial tension.Many cases of study prove that this model provides a theoretical basis for the guidance of gas drilling on fields and the switch of the drilling methods when the formation water influx occurs in air/gas drilling.

针对普光气田气体钻井过程中存在的钻具断裂频繁的问题,在对现场事故统计分析的基础上,从特殊的钻井介质、不同的破岩方式以及钻井过程中钻柱共振等方面定性分析了钻具断裂的原因;通过对钻具断口宏观、微观及材质分析,找到了钻具断裂失效的规律和主要形式--疲劳断裂.提出以下建议:①结合气体钻井情况,研制适合气体钻井工况的专用钻具,制定符合气体钻井钻具的新的API标准;②开展牙轮钻井条件下,钻柱纵振对钻具疲劳断裂的量化影响,尤其应考虑不同钻压下钻柱纵振对钻具疲劳断裂的作用机理研究.以期为预防气体钻井钻具断裂、降低钻井成本、推广应用气体钻井技术提供理论依据.