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| 电磁阀控制井下增压器输出特性 |
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何宇航1,2,廖华林1,2,王敏生3,王华健4,牛继磊1,2,魏俊5
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(1.中国石油大学(华东)石油工程学院,山东青岛 266580;2.非常规油气开发教育部重点实验室(中国石油大学(华东), 山东青岛 266580;3.中国石化石油工程技术研究院有限公司,北京 102206;4.中石化经纬有限公司,山东青岛 266071;5.中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒 841000)
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| 摘要: |
| 超高压水射流井底岩石切槽应力卸载方法是提高破岩效率的有效手段,然而现有井下增压装置为被动增压,超高压脉冲射流输出持续时间短且难以实现输出频率可控可调,导致切槽效率低。设计一种新型电磁阀控制井下增压器,通过室内实验和数值模拟相结合的方式分析其增压性能和输出特性。结果表明:增压装置的输出特性为高压射流和低压射流组合而成的混合脉冲射流,输出波形近似方波且输出频率可调；输出特性受输入压力与结构参数的影响较大,输入压力和活塞面积比增大,使得峰值压力升高而增大了射流切槽能力,活塞行程增大延长了超高压水射流的持续时间,提高了水射流切槽效率。 |
| 关键词: 深部硬岩 高压水射流切槽 井下增压装置 射流特性 可控可调 |
| DOI：10.3969/j.issn.1673-5005.2025.01.021 |
| 分类号::TE 245 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2021YFE0111400);中央高校基本科研业务费专项(22CX01001A-3) |
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| Output jet feature of downhole intensifier controlled by electromagnetic valve |
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HE Yuhang1,2, LIAO Hualin1,2, WANG Minsheng3, WANG Huajian4, NIU Jilei1,2, WEI Jun5
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(1.School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, China;2.MOE Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum(East China), Qingdao 266580, China;3.SINOPEC Research Institute of Petroleum Engineering Company Limited, Beijing 102206, China;4.SINOPEC Matrix Corporation, Qingdao 266071, China;5.R&D Center for Ultra Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, China)
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| Abstract: |
| Stress release with rock slotting by the ultra-high-pressure water jet is an effective method of reducing the rock strength in the bottom hole. However, traditional downhole intensifiers are limited in their effectiveness for rock slotting as they belong to the passive pressurization method, fixed output frequencies, and short durations are along with the high-pressure water jet, resulting in a low efficiency. A novel intensifier controlled by the electromagnetic valve was proposed. The pressurization performance and output characteristics of the intensifier were thoroughly analyzed through lab tests and numerical simulations. The results demonstrate that the output jet feature of the intensifier exhibits a hybrid pulsed jet comprising a combination of high-pressure and low-pressure jets. The output waveform goes like a square wave, with the ability to adjust the output frequency. The output characteristics of the intensifier are significantly influenced by the input pressure and structural parameters. Increasing the input pressure and the plunger area ratio leads to a higher peak pressure, resulting in an improved rock slotting capability of the jet. Moreover, increasing the plunger stroke prolongs the duration of the ultra-high-pressure water jet, thereby enhancing the efficiency of rock slotting. |
| Key words: deep hard rock slotting by high-pressure water jet downhole intensifier output jet feature controllable and adjustable ability |
