气体钻井环空携水能力研究

Experimental Study of Water Carrying Capacity in Gas Drilling

气体钻井在某些方面具有常规钻井液钻井不可比拟的优势,在深层海相地层勘探开发过程中能够提高钻速、降低成本、减小对储层的伤害,具有广阔的应用前景。然而,当钻遇出水地层时,岩屑若遇水水化,黏度增大,容易导致钻头泥包、井眼堵卡等井下复杂问题,影响气体钻井的安全性。依托气体钻井井筒多相流大型实验架,对出水地层气体钻井携水规律进行实验研究。着重分析了井底携水搅动、井壁湿润、液膜形成及回落、液膜波动前进等携水现象,在实验结果分析的基础上,通过对环雾流携水规律的研究,提出了气体钻井极限携水能力计算模型。模型计算结果与实验结果相吻合,表明具有现场实用价值。

Gas shorten the drilling drilling has its own time and lower the unparalleled advantages compared to conventional drilling drilling , specially it can cost of exploration and development in deep marine strata, having a broad prospects for application. However, when the formation water produces, it could cause complex accidents and such as borehole instability which affect the safety of gas drilling. Gas drilling wellbore muhiphase flow experi- mental facility, research the principles of formation water production, analyzes the Air-water two-phase flow, bore- hole face moist , liquid film formation and fall, and other water carrying phenomena are relied on. Based on the analysis of experimental results, research the affection that the ring fog stream affect water carrying ability. Model results consistent with the experimental results show that the model with on-site practical value.