Drag reduction characteristics of RJD-suitable surfactant-polymer composite fluids under high shear

IF 6.4 2区工程技术 Q1 MECHANICS International Communications in Heat and Mass Transfer Pub Date : 2024-11-21 DOI:10.1016/j.icheatmasstransfer.2024.108341

Zhe Zhou , Mengli Li , Zhaolong Ge , Xu Zhang , Yilong Tang , Jinming Cui , Shihui Gong

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Abstract

Radial Jet Drilling (RJD) provides favorable conditions for exploitation of coalbed methane (CBM). However, the jetting medium always remains in a high-shear state (Re>> 1 × 10⁵) during the construction of RJD, with significant pressure loss that is difficult to control. In this paper, two surfactant-polymer composite systems for high-shear conditions are firstly preferred: CTAC-PEO and OTAC-PEO, with drag reduction rates (DR) of 31.92 % and 21.97 %, respectively. Secondly, three fluids were further optimized by adjusting the ratio and concentration of drag reducers: CP11–1000, OP41–1000, and OP41–3000. Their drag reduction characteristics were investigated at different temperatures and shear durations. Among them, the average DR of OP41–3000 at 55 °C is 2.28 and 2.95 times that of CP11–1000 and OP41–1000, respectively. Moreover, terminated DR after 30 mins of cyclic shear is 4.74 and 7.5 times greater than that of them, with a drag reduction retention rate exceeding 80 %. Finally, the “laminae encapsulate chains-network structure” was proposed to explain the mechanism of drag reduction under high shear. This study is the first to investigate drag reduction from the perspective of the jetting medium. The research findings will improve the future advancement of CBM mining utilizing RJD. Additionally, this study can assist in the selection of appropriate drag reducers for high-shear environment and the exploration of drag reduction mechanism.

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适合 RJD 的表面活性剂-聚合物复合流体在高剪切下的减阻特性

径向喷射钻井（RJD）为煤层气（CBM）的开采提供了有利条件。然而，在 RJD 施工过程中，喷射介质始终处于高剪切状态（Re>> 1 × 105），压力损失大，难以控制。本文首先优选了两种适用于高剪切条件的表面活性剂-聚合物复合体系：CTAC-PEO 和 OTAC-PEO，其阻力降低率（DR）分别为 31.92 % 和 21.97 %。其次，通过调整减阻剂的比例和浓度，进一步优化了三种流体：CP11-1000、OP41-1000 和 OP41-3000。研究了它们在不同温度和剪切持续时间下的减阻特性。其中，OP41-3000 在 55 °C 时的平均减阻效果分别是 CP11-1000 和 OP41-1000 的 2.28 倍和 2.95 倍。此外，循环剪切 30 分钟后终止的 DR 分别是它们的 4.74 倍和 7.5 倍，阻力减少保持率超过 80%。最后，研究人员提出了 "层状包链网状结构 "来解释高剪切下阻力降低的机理。这项研究是首次从喷射介质的角度研究减阻问题。研究结果将有助于今后利用 RJD 开采煤层气。此外，这项研究还有助于为高剪切力环境选择合适的减阻剂和探索减阻机理。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.