水力冲击工具优化及井下试验

现有水力冲击技术存在配套工具适应井况有限、性能不稳定和技术机理未进行试验验证等问题，为此，基于海上油田储层及工程特点，进行了水力冲击工具优化及井下试验。通过优化水力冲击工具尺寸、工具材质及抗压强度和改进冲击片关键部件等，形成了适合于海上油田的水力冲击工具。该工具在储层条件接近海上油田储层的长庆油田3口低产低效井进行了井下试验，共采集了6～20个脉冲波形，持续20～60 s，主要技术机理为水力脉冲作用；工具性能稳定，冲击片破裂压力精度高；该技术可显著增强注水井的增注效果，试验井注入能力大幅提升。水力冲击工具优化后，为其在海上油田大尺寸井筒条件下的应用提供了依据。 

Optimization and Downhole Testing of Hydraulic Impact Tools

The current hydraulic impact technologies face various problems such as poor adaptability of associated tools in limited well conditions with unstable performance, and the mechanism of the technologies remains untested or verified. Therefore, the hydraulic impact tools were optimized and tested downhole according to the reservoir and engineering characteristics of offshore oilfields. A hydraulic impact tool customized to offshore oilfields was developed by optimization of its size, material and compressive strength, and modification of the key components such as the impact plates. Downhole tests of the hydraulic impact tool were carried out in three wells with low productivity and efficiency in Changqing Oilfield, the formation condition of which was closed to that of offshore oilfields. In the tests, 6–20 pulse wave forms lasting 20–60 s were collected, the main mechanism of the technology was the hydraulic pulse. The test results demonstrated that the optimized tool achieved stable performance and the modified impact plates exhibited higher precision of fracturing pressure as well. These technology significantly enhanced the injectivity of the water injectors. The optimized hydraulic impact tool provides a basis for the application of the technology in offshore oilfields with large wellbores.