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在气井的加砂压裂测试过程中 ,由于压裂作业遗留在井筒和地层返出的支撑剂 ,随着高速流动的天然气和压裂液的混合流体进入测试管道 ,形成高速含砂射流 ,它对管道及其附件造成非常严重的破坏。通过损坏机理分析 ,结合现场生产实际 ,在气井的加砂压裂测试地面流程中 ,使用耐磨的硬质合金材料和优化油嘴、堵头等管件的结构 ,改变其冲击角 ,可减少流体对管件的冲蚀破坏。在节流上游段使用分离沉砂装置 ,收集井筒和地层返出的支撑剂 ,减少其在流体中的含量。在放喷出口处采用堵塞三通 ,消耗砂粒的冲击动能 ,减少砂粒对管壁的冲蚀破坏。上述技术经在现场使用 ,分离沉砂装置可收集 98%以上的砂粒 ,大大地减少地面流程中支撑剂的含量。硬质合金的使用和管件结构的优化 ,增强了其耐磨性。堵塞三通的应用 ,减少了对管壁的冲蚀破坏。三种技术可将流程安全控制时间延长数十倍以上 ,且成本被控制在比较合理的水平 ,从而达到了安全、经济生产的目的。
During the sand fracturing test in the gas well, because of the proppant left in the wellbore and formation due to the fracturing operation, as the mixed fluid of high velocity flowing natural gas and fracturing fluid enters the test pipe to form a high velocity sandy jet, it The pipeline and its annexes caused very serious damage. According to the analysis of damage mechanism and the actual production in the field, the structure of the pipe fittings with abrasion-resistant cemented carbide, oil nozzle and plug is optimized and the impact angle is changed in the sand-fracturing test of the ground flow in the gas well to reduce the influence of the fluid on the pipe Erosion damage. In the upstream section of the throttling, a separate grit device is used to collect the proppant returned from the wellbore and formation to reduce its content in the fluid. In the discharge outlet plugging the three links, the impact of consumption of sand kinetic energy to reduce erosion of sand wall erosion. The above technology is used in the field, the separation of grit devices can collect more than 98% of sand, greatly reducing the proppant content of the ground process. The use of cemented carbide and the optimization of the tube structure enhance its wear resistance. Plug the application of three links, reducing the erosion of the wall erosion. Three kinds of technology can extend the process safety control time more than ten times, and the cost is controlled at a more reasonable level, so as to achieve the purpose of safe and economical production.