摘要
针对水平井分段压裂施工后存在钻塞周期长,施工成本高等问题,研制了一种新型免钻铣的可降解桥塞。介绍了可降解桥塞的结构组成和工作原理,对可降解材料进行了不同温度,不同浓度条件下的降解性能试验,分析了可降解材料的力学性能,并对可降解桥塞试验样机进行高温环境下室内承压性能试验。试验结果表明:可降解材料为一种Mg-Al合金为基质,Ni-Cu合金为包覆层的金属材料,在NaCl溶液中可自行降解,且浸泡温度越高,NaCl质量分数越大,Cl-浓度越高,降解速度越快;可降解材料的最大抗拉强度342MPa,变形量约在5mm处发生断裂;由可降解材料加工而成的可降解桥塞试验样机在150℃高温环境下满足70MPa承压密封性能要求。研制的新型可降解桥塞在长庆油田进行了现场试验,试验效果较好。
Aiming at the issues of longer cycle and higher construction costs for drilling bridge plug after horizontal wells staged fracturing,the new type degradable bridge plug was developed without drilling and milling. The structural composition and working principle of the degradable bridge plug was introduced. The degradation performance experiment was carried out under the environment of different temperatures,different concentrations for the degradable material. The mechanical property of the degradable material was analyzed. The experimental prototype of degradable bridge plug was carried out indoor pressure bearing performance experiment in environment of high temperature. The experiment results show that degradable material is a metallic material with Mg-Al alloy as substrate,Ni-Cu alloy as cladding layer. The degradable material can degrade in Na Cl solution by itself,and the higher soaked temperature,Na Cl mass fraction and the concentration of Cl-,the faster degradation rate. The Maximum tensile strength of the degradable material can reach 342 MPa,and the material breaks when the deformation reaches 5 mm. The degradable bridge plug mechanical property was made of degradable material can meet the requirements of 70 MPa pressure bearing sealing performance in environment of 150 ℃ high temperature. The developed new type degradable bridge plug has been tested in Changqin oilfield with the better test effect.
出处
《科学技术与工程》
北大核心
2017年第24期228-232,共5页
Science Technology and Engineering
基金
中国石油渤海钻探2015年重大技术研究项目(2015ZD15K)
中国石油渤海钻探分公司项目(2016JXJF-07)资助
关键词
水平井分段压裂
可降解材料
桥塞
降解性能
承压性能
试验
horizontal well staged fracturing
degradable material
bridge plug
degradation performance
pressure bearing performance
test
