| 斧形曲面PDC齿在硬塑性地层破岩性能研究 |
| 投稿时间：2023-08-23 修订日期：2023-11-12 点此下载全文 |
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| 基金项目:国家自然科学基金青年科学“热力复合作用下PDC钻头动态磨损机理与引磨力平衡布齿理论研究”(51904263)、企事业单位委托科技项目“川东北气矿2023年五宝场区块须家河组大斜度井全寿命异形齿高效破岩特性分析与结构设计”(XNSJS2023-48) |
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| 中文摘要:为解决川东油气钻井中五宝场沙溪庙组硬塑性地层PDC钻头磨损严重、起下钻频繁的问题，开展了斧形曲面PDC齿在硬塑性地层破岩性能的研究。首先采用X射线衍射试验与三轴力学试验分别获取该地层岩石性质和力学参数，然后采用有限元仿真与试验相结合的方法开展斧形曲面PDC齿破岩性能研究。研究结果表明：斧形曲面PDC齿主要以剪切、挤压、犁切共同作用破岩；相较于常规PDC齿，斧形曲面PDC齿有更强的吃入岩石的能力和稳定性，能有效减小钻头异常振动，提高钻头寿命，并在不同磨损高度（0~3mm）时，破岩比功降低2.2%~8.2%；根据试验得到斧形曲面齿较常规齿破岩性能提高了11.39%，且试验与仿真平均切削力误差仅为7.46%，验证了仿真模型的正确性。本研究表明斧形曲面PDC齿在硬塑性地层对提高破岩性能具有重要意义。 |
| 中文关键词:斧形曲面PDC齿 硬塑性地层 破岩比功 磨损高度 破岩性能 |
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| Study on rock breaking performance of Axe-shaped camber PDC cutters in the hard plastic formation |
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| Abstract:To solve the problem of severe wear and frequent trip of PDC bit in hard plastic formation of Shaximiao Formation in Wubaochang oil and gas drilling in east Sichuan, the study of lithology breaking ability of PDC cutters with axe shape curved surface in hard plastic formation was carried out. Firstly, X-ray diffraction test and triaxial mechanical test are used to obtain the rock properties and mechanical parameters of the formation, and then the finite element simulation and test are combined to study the rock breaking performance of the Axe-shaped camber PDC cutters. The results show that: the axe-shaped camber PDC cutters mainly break rock by the combined action of shearing, extrusion and plowing. Compared with the conventional PDC cutters, the Axe-shaped camber PDC cutters have stronger pressing rock-breaking ability and stability, can effectively reduce the abnormal vibration of the bit, improve the bit life, and at different wear heights (0-3mm), the rock breaking mechanical specific energy can be reduced by 2.2%-8.2%. According to the test results, the rock breaking performance of the Axe-shaped camber PDC cutters is 11.39% higher than that of the conventional cutters, and the average cutting force error between test and simulation is only 7.46%, which verifies the correctness of the simulation model. This study shows that the Axe-shaped camber PDC cutters are of great significance in improving the rock breaking performance in hard plastic formation. |
| keywords:Axe-shaped camber PDC cutters hard plastic formation mechanical specific energy Wear height rock breaking performance |
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