摘要
近年来随着体积压裂的深入,压裂规模向＂万方液、千方砂＂发展,但压裂井口仍采用常规压裂井口。常规压裂井口采用四通结构,大方量、高排量压裂液从三端注入施工,其液体流向会对井口四通相贯线部位及下方管壁产生严重冲蚀,井口出现渗漏,影响施工安全。为此提出了一种新型多注入头压裂井口。多注入头压裂井口采用六通结构,注入方式为45°角四端注入,压裂液进入井口后流道发生改变,压裂液相互冲击减弱。采用FLUENT软件对新型多注入井口进行冲蚀模拟分析,结果表明,其冲蚀的区域主要为从六通相贯线处到下方管壁处。应用此压裂井口进行现场施工试验,施工过程中井口无渗漏,施工后对井口进行检测,发现检测结果与冲蚀模拟结果基本吻合。相比于常规压裂四通井口,新设计的多注入头压裂六通井口能显著降低压裂液对井口的冲蚀,提高井口的使用寿命。
In recent years,fracturing scale is developing to ＂ten thousand-cubic meter liquid and thousandcubic meter sand＂ with the deepening of stimulated reservoir volume（SRV） fracturing,but the wellhead for the SRV fracturing is the same as that for the conventional fracturing.The structure of the wellhead for the conventional fracturing is in four-way.Fracturing fluid with high volume and discharge is injected and operat-ed from three-terminal,which will erode the position of four-way intersecting line and bottom pipe wall greatly,and the leakage will occur at the wellhead which will influence construction safety.So a new type of multiple-head fracture wellhead was developed.The structure of it is in six-way,and the fracturing fluid is injected from four terminals at the angle of 45 °.Flow channel after the fracturing fluid was injected into may be changed and the interaction of the fracturing fluid will be weakened.FLUENT software was used for ero-sion simulation analysis on the new type of multiple-head wellhead.The result shows that the erosion areas are mainly from the six-way intersecting line to the bottom pipe wall.After this multiple-head wellhead was applied in the field,there was no leakage at the wellhead during the operation.The wellhead was tested after the operation,and the tested result was basically as the same as that by erosion simulation.Compared with the four-way wellhead for the conventional fracturing,the new six-way wellhead can reduce the erosion of the fracturing fluid on the wellhead and prolong the service life of the wellhead.
出处
《中外能源》
CAS
2018年第2期60-63,共4页
Sino-Global Energy
关键词
压裂井口
多注入头
六通结构
冲蚀分析
fracture wellhead
multi-injection head
six-way structure
erosion analysis
