基于壁面剪切速率相等的固井冲洗效率评价

doi:10.11885/j.issn.1674-5086.2023.03.14.02

摘要/Abstract

摘要： 冲洗效率是评价冲洗液性能的关键指标，直接影响冲洗液的优选优化、用量，进而影响固井质量。然而，目前冲洗效率评价存在不足：一方面，采用的常温常压评价法未经过失水形成泥饼的过程；另一方面，没有将装置的冲洗转速与施工排量相互联系。针对这一问题，基于壁面剪切速率相等原理，建立了冲洗效率评价装置的冲洗转速计算模型，并提出了高温高压下泥饼冲洗效率评价方法。该模型将钻井液和冲洗液在井筒内的流动与在评价装置中的流动有机结合起来。高温高压冲洗效率评价方法的适用性分析表明：高温高压冲洗效率评价方法具有良好的重复性，实验结果对比性强，能够为冲洗性能评价优选和施工参数优化提供依据。此外，研究发现，冲洗效率随泥饼失水形成时间和压差的增加而减小，随冲洗时间和环空返速的增加呈先快后慢增大。

关键词: 壁面剪切速率, 冲洗效率, 冲洗液, 固井, 高温高压

Abstract: The flushing efficiency is a key index to evaluate the performance of flushing fluid, which directly affects the optimization, dosage, and then the cementing quality. However, the current evaluation methods for flushing efficiency are either at room temperature and pressure represented by the rotational viscometer method, and there is no process of water loss to form a mud cake, or there is little connection between the flushing speed of the device and the annulus displacement. To solve this problem, based on the principle of equal wall shear rate, the rotating speed model of the flushing efficiency evaluation device was established during mud cake formation and flushing, and the evaluation method of mud cake flushing efficiency under high temperature and high pressure was proposed. The method combines the flow of drilling fluid and flushing fluid in the well with the flow in the flushing efficiency evaluation device. The applicability analysis of high temperature and high pressure flushing efficiency evaluation method shows that the high temperature and high pressure flushing efficiency evaluation method has good repeatability, and the experimental results have high comparison, which can provide a basis for the optimization of flushing performance evaluation and application process parameters optimization. In addition, it is found that the flushing efficiency decreases with the increase of the formation time of mud cake water loss and the pressure difference, and increases quickly at first and then slowly with the increase of the flushing time and displacement.

Key words: wall shear rate, flushing efficiency, flushing fluid, cementing, high temperature and high pressure

中图分类号:

TE256.7

冯颖韬, 崔策, 王有伟, 黄峰, 袁彬. 基于壁面剪切速率相等的固井冲洗效率评价[J]. 西南石油大学学报(自然科学版), 2025, 47(5): 134-142.

FENG Yingtao, CUI Ce, WANG Youwei, HUANG Feng, YUAN Bin. Evaluation of Cementing Flushing Efficiency Based on the Same Wall Shear Rate[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 134-142.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2025/V47/I5/134

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