Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

Abstract To improve the rate of penetration (ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleani...

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Autores principales:	Huai-Zhong Shi, Zhao-Sheng Ji, He-Qian Zhao, Heng-Yu Song, Zhen-Liang Chen
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Partial underbalanced drilling Coiled tubing Flow fields Cuttings removal Rate of penetration (ROP) Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/ac111f905eb34600ac93d41349ed4cf5
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spelling	oai:doaj.org-article:ac111f905eb34600ac93d41349ed4cf52021-12-02T07:59:10ZInvestigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations10.1007/s12182-018-0271-91672-51071995-8226https://doaj.org/article/ac111f905eb34600ac93d41349ed4cf52018-10-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0271-9https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract To improve the rate of penetration (ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller. According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning. Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method.Huai-Zhong ShiZhao-Sheng JiHe-Qian ZhaoHeng-Yu SongZhen-Liang ChenKeAi Communications Co., Ltd.articlePartial underbalanced drillingCoiled tubingFlow fieldsCuttings removalRate of penetration (ROP)ScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 4, Pp 830-840 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Partial underbalanced drilling Coiled tubing Flow fields Cuttings removal Rate of penetration (ROP) Science Q Petrology QE420-499
spellingShingle	Partial underbalanced drilling Coiled tubing Flow fields Cuttings removal Rate of penetration (ROP) Science Q Petrology QE420-499 Huai-Zhong Shi Zhao-Sheng Ji He-Qian Zhao Heng-Yu Song Zhen-Liang Chen Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
description	Abstract To improve the rate of penetration (ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller. According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning. Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method.
format	article
author	Huai-Zhong Shi Zhao-Sheng Ji He-Qian Zhao Heng-Yu Song Zhen-Liang Chen
author_facet	Huai-Zhong Shi Zhao-Sheng Ji He-Qian Zhao Heng-Yu Song Zhen-Liang Chen
author_sort	Huai-Zhong Shi
title	Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
title_short	Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
title_full	Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
title_fullStr	Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
title_full_unstemmed	Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations
title_sort	investigations into the coiled tubing partial underbalanced drilling (ct-pubd) technique for drilling hard formations
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/ac111f905eb34600ac93d41349ed4cf5
work_keys_str_mv	AT huaizhongshi investigationsintothecoiledtubingpartialunderbalanceddrillingctpubdtechniquefordrillinghardformations AT zhaoshengji investigationsintothecoiledtubingpartialunderbalanceddrillingctpubdtechniquefordrillinghardformations AT heqianzhao investigationsintothecoiledtubingpartialunderbalanceddrillingctpubdtechniquefordrillinghardformations AT hengyusong investigationsintothecoiledtubingpartialunderbalanceddrillingctpubdtechniquefordrillinghardformations AT zhenliangchen investigationsintothecoiledtubingpartialunderbalanceddrillingctpubdtechniquefordrillinghardformations
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Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

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