硼标记压裂裂缝示踪剂的制备及性能

Preparation and Performance of Boron-Labeled Fracturing Fracture Tracer

硼具有高的热中子捕获截面,可用于油气井下压裂裂缝的探测。通过热重分析-差热分析法(TG-DTA)、X射线衍射分析(XRD)、能谱分析(EDS)、扫描电镜(SEM)和电感耦合原子发射光谱(ICP-AES)测试方法,研究了碳化硼(B 4C)不同外加量(质量分数分别为1%、5%和10%)对压裂示踪支撑剂结构和性能的影响。结果表明,当B 4C外加量1%时,主晶相为刚玉相,69 MPa闭合压力下支撑剂的破碎率和体积密度分别为5.4%和1.66 g·cm^(-3)。B 4C外加量为5%和10%时,B 4C氧化生成的氧化硼与氧化铝反应生成硼酸铝晶须,刚玉相减少。B 4C氧化生成的二氧化碳和氧化硼的挥发,形成支撑剂的多孔结构,导致支撑剂破碎率升高和体密度下降。

Boron with high thermal neutron capture cross section can be used to detect fracturing fractures in oil and gas downhole.The effects of different amounts of B 4C(mass fraction of 1%,5%,and 10%,respectively)on the structure and performance of the fracturing proppant were investigated by thermogravimetric-differential thermal analysis(TG-DTA),X-ray diffraction analysis(XRD),energy spectrum analysis(EDS),scanning electron microscope(SEM)and inductively coupled atomic emission spectroscopy(ICP-AES).The results show that when the adding amount of B 4C is 1%,its main phase is corundum.The breakage ratio and volume density under the 69 MPa pressure are 5.4%and 1.66 g·cm^(-3),respectively.When the B 4C adding amount of is at 5%or 10%,the boron oxide generated by oxidation of B 4C reacts with alumina to form aluminum borate whiskers,and the corundum phase is reduced.Carbon dioxide and boron oxide from the oxidation of B 4C evaporated,form a porous structure of the proppant,and result in an increase of the breakage ratio and a decrease in bulk density.