空气钻井工作特性分析与工艺参数的选择研究  

Operation characteristics analysis and process parameters selection of air drilling

作　　者：苏义脑[1] 周川[1] 窦修荣[1] 

机构地区：[1]中国石油勘探开发研究院

出　　处：《石油勘探与开发》2005年第2期86-90,122,共6页Petroleum Exploration and Development

摘　　要：空气钻井是一种特殊的欠平衡钻井技术,采用具有极大压缩性的空气作为循环介质,具有钻速高、成本低、环保性好等优势,应用越来越广泛。空气钻井循环系统的压力分布、钻井装备的选择、钻井参数的合理配置与传统钻井方式相比有很大区别。在国内外现有空气钻井理论研究的基础上,通过建立压力分布模型,推导计算公式,编程计算,得到了空气钻井中压力分布规律、压缩气体流速场分布特点、空气螺杆马达转速受压力温度影响的变化趋势以及流体温度模型的改变对循环系统中压力分布的影响等结果。在空气钻井的工艺参数研究中,主要进行了最小气量和合理钻速的选择计算,结果是:环空中过流截面增大会造成最小气量取值变大,过流截面由小变大处是携屑最困难的位置;给出了排气量为1.2m3/s时,通用算例的合理钻速取值。Taking the compressed air as circulated fluid, air drilling has many different characteristics from mud drilling, such as pressure distribution, selection of drilling equipments and the reasonable configuration of drilling parameters. On the basis of the existing theory of air drilling, the new pressure model is constructed and calculation formulas are derived to get the distribution law of the pressure, the velocity characteristics of the compressed air, the variation of rotary speed of PDM(positive displacement motor) under the effect of temperature and pressure and the effect of temperature model variation on the pressure distribution in the circulation system. The calculations of minimum gas flow rate and reasonable ROP show that the increase of the flow section may result in the increase of minimum gas flow rate, and the most difficult position to carry cuttings in the hole is the turning point from small flow section to large flow section. And the reasonable ROP at flow rate of (1.2)m^3/s is obtained.

关 键 词：空气钻井 模型优化 工作特性分析 工艺参数计算 钻速选择 

分 类 号：TE242.6[石油与天然气工程—油气井工程]