射流式井下增压器数值试验研究  

Numerical Study of Flow Field for Fluidic Downhole Boost Compressor

作　　者：薛亮[1] 汪志明[1] 李帮民[1] 

机构地区：[1]中国石油大学(北京)石油天然气工程学院,北京昌平102249

出　　处：《石油钻探技术》2010年第6期79-83,共5页Petroleum Drilling Techniques

基　　金：中国石化科技攻关项目"井底增压钻井技术研究"(编号:JP04015);教育部"长江学者和创新团队发展计划"资助项目(编号:IRT411)联合资助

摘　　要：超高压喷射钻井可以大幅提高机械钻速,井下增压器是超高压喷射钻井技术的核心装备。基于计算流体力学相关理论与方法,针对第二代射流式井下增压器,建立了数值试验模型,并基于FLUENT数值模拟软件对第二代射流式井下增压器进行了数值试验。结果表明:第二代射流式井下增压器在增加新流道后,上、下活塞缸之间实现了完全并联,水力特性明显改善;增加旁通阀后,消除了复位冲程节流阀憋压效应,工具压降明显下降。进行了第二代射流式井下增压器下井试验,试验一次成功,工具压降与数值试验结果基本一致,验证了数值试验方法的可行性。Downhole boost compressor is the core technique of ultrahigh pressure jet drilling,which can increase penetration rate in deep well.Based on the theories and methods of computational fluid dynamics,the numerical model for compressor was developed and numerical experiments were conducted using FLUENT for the second generation of downhole boost compressor.The results indicated that with the new flow channel were added in the second generation of downhole compressor,the two piston cylinders（upper and lower） were connected in parallel,the fluidic characteristic was improved obviously.By increasing the bypass valve,the pressure holding effect in the process of restoration stroke was improved.Pressure drop was reduced significantly.The underground test was conducted successfully.Pressure drop is consistent with the numerical results which verify the feasibility of numerical method.

关 键 词：喷射钻井 井下增压器 增压冲程 复位冲程 数值模拟 

分 类 号：TE248[石油与天然气工程—油气井工程]