水基钻井液高温高压流变动力学研究

何淼; 施皓瀚; 许明标

doi:10.3969/j.issn.1001-5620.2021.03.002

水基钻井液高温高压流变动力学研究

doi: 10.3969/j.issn.1001-5620.2021.03.002

1. 长江大学石油工程学院, 武汉 430100;
2. 非常规油气湖北省同创新中心(长江大学), 武汉 430100

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中图分类号: TE254.1
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出版历程
- 收稿日期: 2021-01-31

Study of Rheological Dynamics of Water-Based Drilling Fluids at High Temperature and High Pressure

1. College of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100;
2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100

摘要

摘要: 钻井液性能受深井超深井高温高压的影响会产生较大变化，为确保安全高效钻井作业，必须准确掌握钻井液在井底高温高压条件下的流变行为。针对一类典型的抗高温聚磺水基钻井液，开展了广域温压（～180℃，～100 MPa）下流变性能评价研究，定量评价了其流变参数随温度压力的变化规律。结果表明：聚磺水基钻井液流变参数受压力的影响明显小于温度的影响；在温压组合条件下，钻井液流变模式拟合效果排序为：赫-巴>罗-斯>宾汉>卡森>幂律。以赫-巴模式为基础，采用直接拟合方法从（T，P）、（T，1/P）、（T，lnP）、（1/T，P）、（1/T，1/P）、（1/T，lnP）、（lnT，P）、（lnT，1/P）、（lnT，lnP）9种组合中构建了其流变参数随温压变化的最佳拟合方程，建立了聚磺水基钻井液高温高压流变动力学预测模型，模型预测精度高，相对误差率98%集中在-7.15%～11.46%之间，平均误差仅为1.03%。
- 聚磺水基钻井液 /
- 高温高压 /
- 流变模式 /
- 赫-巴模式 /
- 直接拟合
Abstract: In order to ensure the safety of drilling process, it is necessary to have a more profound understanding of the rheological properties of drilling fluid under high temperature and high pressure (HTHP). Polysulfide drilling fluid has excellent performance and is widely used. Experimental research on the rheological properties of drilling fluid under HTHP still needs to be strengthened. Under wide range of temperature and pressure(-180℃, -100 MPa), the rheological properties of the selected water-based drilling fluid were evaluated, and the rheological parameters were quantitatively evaluated and analyzed. The experimental data show that the rheological property of Polysulfide drilling fluid is less affected by pressure than by temperature. By fitting the commonly used rheological models (Bingham model, Power Law model, Casson model, Herschel-Bulkely model and Robertson-Stiff model) in drilling field, the fitting effect of each model is analyzed, and the best rheological model for describing the rheological behavior of the drilling fluid is found out. The results show that both The H-B model and the R-S model can describe the rheological behavior of the drilling fluid under HTHP, and the fitting effect of the H-B model is slightly better than that of the R-S model. The order of the fitting effect of each mode is as follows:Herschel-Bulkely ≈ Robertson-Stiff ≈ Bingham > Casson > Power Law. Based on the H-B model, the optimal fitting equation of rheological parameters with temperature and pressure was obtained from the nine combinations of (T,P), (T,1/P), (T,lnP), (1/T,1/P), (1/T,lnP), (lnT,P), (lnT,1/P) and (lnT,lnP) by direct fitting method and finally the prediction formula of shear stress of polysulfide drilling fluid was obtained. The prediction accuracy of the formula was good, and the relative error rate was mostly concentrated between -7.15%-11.46%, The average error was only 1.03%.
- Polysulfide water-based drilling fluid /
- High temperature and high pressure /
- Rheological model /
- Herschel-Bulkely model /
- Direct fitting

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