欠平衡钻井参数实时数据分析处理系统的开发与应用

用常规钻井方法打开储层，容易造成储层伤害，影响勘探效率和降低勘探成功率，欠平衡钻井技术是一种很好的解决办法。虽然探井欠平衡钻井效果明显，但是应该看到欠平衡钻井是一项复杂的技术。在低压低孔渗火山岩气层上实施探井欠平衡钻井仍存在诸多困难，如欠平衡井段钻遇地层压力变化较大，岩性成份交互变化，地层坚硬，中途需多次起钻换钻头压井，压力难以预测准确，岩性不稳定，低压欠压值难以控制等。欠平衡钻井参数实时数据分析处理系统的开发与应用有效地解决了这一难题。文章系统地介绍了欠平衡钻井参数实时数据分析处理系统实现的功能、创新点及关键技术、存在问题，以及系统在生产中应用产生的效益。

DEVELOPMENT OF THE REAL-TIME DATA ANALYZING AND PROCESSING SYSTEM OF UNDERBALANCED DRILLING PARAMETERS AND ITS APPLICATION

The reservoir was easily damaged,in conventional drilling, thus affecting exploration effectiveness and reducing exploration success ratio. Undcrbalanced drilling, however, is a good method of solving these problems. Although the exploration effectiveness may be obviously raised by underbalanccd drilling, it must be admitted that the underbalanced drilling is a complex technology. In exploring for the volcanic rock gas reservoir with low formation pressure, low porocity and low permeability, there existed many difficulties in underbalanced drilling, such as encountering the strata with great formation pressure change, low under-balanced pressure value, unstable and interactive changeful hithology and high rock hardness, and as wanting multiple tripping the bit and killing well,etc. All of these difficulties were effectively resolved by means of the development of the real-time data analyzing and processing system of undcrbal- anced drilling parameters and its application. The functions, innovatory points, key techniques, existent problems and e-conomic benefits of the system are overall introduced in the paper.