Research on Cuttings Transport Performance of Circulating Valve Cleaner Based on CFD-DEM
In the process of drilling， inefficient drill cuttings transport may lead to an increase in annular cuttings concentration and equivalent circulating density （ECD）， thereby causing some problems such as tool wear and lost circulation. To solve these problems， a new type of borehole annulus circulati...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of China Petroleum Machinery
2025-07-01
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| Series: | Shiyou jixie |
| Subjects: | |
| Online Access: | http://www.syjxzz.com.cn/en/#/digest?ArticleID=4979 |
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| Summary: | In the process of drilling， inefficient drill cuttings transport may lead to an increase in annular cuttings concentration and equivalent circulating density （ECD）， thereby causing some problems such as tool wear and lost circulation. To solve these problems， a new type of borehole annulus circulating valve cleaner was developed. Based on the H-B non-Newtonian fluid model， a numerical model for evaluating the cuttings transport performance of multi-stage borehole annulus circulating valve cleaner was built by using the coupled CFD-DEM calculation method. The effects of the number of nozzles， nozzle diameter， nozzle angle and drill pipe rotation speed on the cuttings transport performance of the circulating valve cleaner were analyzed. The results show that increasing the diameter and number of nozzles or raising the drill pipe rotation speed leads to an increase in the concentration of cuttings in annulus and a significant decrease in the cuttings transport ratio （CTR）. When the number of nozzles is 3 and the nozzle diameter is 10 mm， the cuttings transport performance is the best. As the nozzle angle increases， the CTR value increases and then decreases. When the nozzle angle is 30°， the CTR value is the highest， indicating the highest cuttings transport efficiency. In vertical borehole， the rotation of the circulating valve cleaner produces a swirling effect， which may cause the spiral migration of cuttings， thereby making cuttings retain longer in the borehole to induce a significant reduction in the cuttings transport efficiency. The higher the rotational speed， the stronger the swirling effect， and the worse the cuttings transport performance. Given the above optimal parameters， the borehole annulus flow rate increases by nearly 58% and the overall CTR increases by nearly 10% after using the proposed circulating valve cleaner. The research conclusions are of great significance for improving the efficiency of annulus cuttings transport and ensuring efficient and safe oil and gas development. |
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| ISSN: | 1001-4578 |