Effect of flushing fluid composition on rate of penetration in limestone: Surface and interface aspects

Wai Li, Jishan Liu, Xionghu Zhao, Can Yang, Jian Zhang, Yufei Li, Hui Peng, Lv Denghui

Research output: Chapter in Book/Conference paperConference paperpeer-review

5 Citations (Scopus)

Abstract

Rate of penetration (ROP) is considered as a crucial economic and technical indicator in the drilling process. An enhancement in ROP, even if it is small, will result in substantial cost savings. Although the existence of influence of water-based flushing media composition on ROP has been well-known, further understanding about this effect needs to beestablished, especially in terms of surface and interface aspects. This is mainly due to the complexity of drilling process in chemical fluid environment. In this paper, the effects of several commonly used materials in flushing fluid on ROP were investigatedto provide valuable information about chemically enhanced drilling.Using a modified coring machine with a thin walled diamond impregnated coring bit, drilling experiments in limestone were performed in the laboratory. Fluids with different composition including a variety of surfactants and polymers were used as the flushing media, and the corresponding ROPs were observed. Important properties of fluid, rock surface and rock-fluid interface, such as surface tension, indentation hardness, Zeta potential, contact angle, Gibbs free energy changes of wetting and spreading, were measured or calculated to gain an insight into the variation of ROP.The results suggested that ROP was obviously influenced by additive type and concentration. Some surfactants (such as CTAB and BS-12) and polymers (such as polyoxyethylene) have the ability to improve drilling efficiency, and there are optimal concentrations forthe enhancement of ROP. On the basis of discussion on these observations,thechange of ROP is ascribed to the integrated influence of surface Gibbs free energy change, Zeta potential, indentation hardness and fluid lubricity. These factors, closely related to the fluid composition, act jointly during drilling. This paper ishelpful to design fast drilling fluids. Through adjusting chemical composition of the fluid, the interfacial properties of fluid and rockcan be controlled to facilitate rock fragmentation, which may be of great significance for engineering practice.

Original languageEnglish
Title of host publication1st International Conference on Advances in Rock Mechanics, TuniRock 2018
EditorsE. Hamdi
PublisherInternational Society for Rock Mechanics
Pages143-156
Number of pages14
ISBN (Electronic)9789973092908
Publication statusPublished - Mar 2018
Event1st International Conference on Advances in Rock Mechanics, TuniRock 2018 - Hammamet, Tunisia
Duration: 29 Mar 201831 Mar 2018

Publication series

Name1st International Conference on Advances in Rock Mechanics, TuniRock 2018

Conference

Conference1st International Conference on Advances in Rock Mechanics, TuniRock 2018
Country/TerritoryTunisia
CityHammamet
Period29/03/1831/03/18

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