随着页岩气开采难度的增加,为了提高效率,部分厂商设计了140 MPa高低压管汇撬,由于压裂液的冲蚀以及管道工作处于高压环境,高压管汇极易发生冲蚀磨损情况。针对140 MPa压力下四通管道的冲蚀磨损情况,根据RNGκ-ε湍流模型和DPM冲蚀模型...随着页岩气开采难度的增加,为了提高效率,部分厂商设计了140 MPa高低压管汇撬,由于压裂液的冲蚀以及管道工作处于高压环境,高压管汇极易发生冲蚀磨损情况。针对140 MPa压力下四通管道的冲蚀磨损情况,根据RNGκ-ε湍流模型和DPM冲蚀模型,利用FLUENT仿真软件分析水力压裂情况下的管汇撬四通管道的冲蚀磨损规律。分析结果发现,冲蚀磨损面主要发生在四通管道交汇处及附近管壁上。With the increasing difficulty of shale gas extraction, in order to improve efficiency, some manufacturers have designed 140 MPa high and low pressure manifold levers. Due to the erosion of fracturing fluid and high-pressure environment, the high-pressure manifold is prone to erosion and wear. Based on the turbulence model and DPM erosion model, FLUENT simulation software was used to analyze the erosion and wear patterns of the four-way pipeline under hydraulic fracturing pressure of 140 MPa. The analysis results show that erosion and wear surfaces mainly occur at the intersection of four-way pipelines and near the pipe walls.展开更多
文摘随着页岩气开采难度的增加,为了提高效率,部分厂商设计了140 MPa高低压管汇撬,由于压裂液的冲蚀以及管道工作处于高压环境,高压管汇极易发生冲蚀磨损情况。针对140 MPa压力下四通管道的冲蚀磨损情况,根据RNGκ-ε湍流模型和DPM冲蚀模型,利用FLUENT仿真软件分析水力压裂情况下的管汇撬四通管道的冲蚀磨损规律。分析结果发现,冲蚀磨损面主要发生在四通管道交汇处及附近管壁上。With the increasing difficulty of shale gas extraction, in order to improve efficiency, some manufacturers have designed 140 MPa high and low pressure manifold levers. Due to the erosion of fracturing fluid and high-pressure environment, the high-pressure manifold is prone to erosion and wear. Based on the turbulence model and DPM erosion model, FLUENT simulation software was used to analyze the erosion and wear patterns of the four-way pipeline under hydraulic fracturing pressure of 140 MPa. The analysis results show that erosion and wear surfaces mainly occur at the intersection of four-way pipelines and near the pipe walls.
文摘目的 探讨2根4F MPA1导管经右肘静脉行双侧肾上腺静脉同步采血术(AVS)的可行性和安全性。方法 连续纳入2021年10月至2022年10月在襄阳市中心医院需行AVS的51例原发性醛固酮增多症患者,采用2根4F MPA1导管(其中1根塑形成猪尾形)经右肘静脉行双侧同步AVS。统计选用导管、双侧肾上腺静脉同步采血成功率、并发症发生率。结果 对右肾上腺静脉均使用4 F MPA1导管,左肾上腺总干静脉、左肾上腺中央静脉均使用经特殊塑形的4 F MPA1导管。双侧同步AVS成功率为92.2%(47/51)。发生1例(1.96%)肾上腺血肿。结论 经右肘静脉使用2根4 F MPA1导管行双侧同步AVS,导管选择及操作简单、创伤小、安全可行,但因样本量小,仍需进一步研究验证。
