gscienceMining Science and Technology (Russia)Горные науки и технологии2500-0632The National University of Science and Technology MISiIS (NUST MISIS)10.17073/2500-0632-2023-08-146gscience-530Research ArticleGEOLOGY OF MINERAL DEPOSITSГЕОЛОГИЯ МЕСТОРОЖДЕНИЙ ПОЛЕЗНЫХ ИСКОПАЕМЫХNew advances in drilling operations in sandstone, shale, and carbonate formations: a case study of five giant fields in the Mesopotamia Basin, IraqНовые достижения в области бурения в песчаниковых, сланцевых и карбонатных формациях на примере исследования пяти крупных месторождений в Месопотамском бассейне Иракаhttps://orcid.org/0000-0003-0509-4504Аль-ДуджайлиА. Н.Al-DujailiA. N.

Ахмед Н. Аль-Дуджайли – доктор наук, факультет нефтяного инжиниринга, Технологический университет имени Амира Кабира

г. Наджаф

Scopus ID 57224971849

Ahmed N. Al-Dujaili – PhD, Doctor, Petroleum Engineering Department

Najaf, Iraq

Scopus ID 57224971849

ahmed.noori203@aut.ac.irТехнологический университет имени Амира КабираИракAmirkabir University of TechnologyIraq20242612202494308327Copyright © Al-Dujaili A.N., 20242024Аль-Дуджайли А.Н.Al-Dujaili A.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://mst.misis.ru/jour/article/view/530

Drilling challenges in the Mesopotamian Basin, Southern Iraq, are varied and include such issues as mud loss, bit damage, and differential sticking. This study aims to analyze these problems across the stratigraphic column in the study area. The results show that the MMD65R, EQH16R, and SF74R bits were successfully used for the 16” section, while the MSi616L bit was the most efficient for the 12¼” section. The MMD65R was suitable for the 8½” section, with the EQH12DR bit being used for the remaining parts of this section. The MMD54 bit showed excellent performance, achieving the highest rate of penetration (ROP) of 26.9 m/hr in well horizontal sections. Mud losses were most commonly observed at the base of the Dammam, Rus, Tanuma, Mishrif, Hartha, Shuaiba, and Zubair Formations. An appropriate drilling mud density is 1.28 sg is recommended for Zubair and Mishrif Formations. Additionally, tripping in/out operations must be conducted at controlled speed to prevent surging or swabbing the well. Potassium Chloride concentrations should be maintained between 3 to 5%. A 7” production liner must be run and properly seated to isolate the Mishrif and Zubair Formations, with overlap to prevent potential communication between lower water-bearing zones and shallow loss zones.

Проблемы бурения в Месопотамском бассейне (нефтегазоносном бассейне Персидского залива) (южная часть Ирака) разнообразны и касаются таких вопросов, как потери бурового раствора, поломка долота и дифференциальный прихват. Цель настоящего исследования заключается в анализе указанных проблем по всему стратиграфическому разрезу в исследуемом районе. Согласно полученным результатам долота MMD65R, EQH16R и SF74R отлично проявили себя для бурения 16-дюймового профиля, а долото MSi616L показало наибольшую эффективность в 12¼-дюймовом профиле. Для 8½-дюймового профиля было успешно использовано долото MMD65R, а для остальных участков этого профиля применялось EQH12DR. Для долота MMD54 зарегистрированы отличные показатели – наибольшая механическая скорость бурения (ROP) 26,9 м/ч в горизонтальных профилях скважины. Потери бурового раствора чаще всего наблюдались в основании формаций Даммам, Рус, Танума, Мишриф, Харта, Шуайба и Зубейр. Для формаций Зубейр и Мишриф рекомендуется плотность бурового раствора 1,28 г/см3. Кроме того, во избежание пульсации или свабирования скважины спускоподъемные операции необходимо выполнять с контролируемой скоростью. Концентрация хлористого калия должна поддерживаться в пределах от 3 до 5 %. Для изоляции пластов формаций Мишриф и Зубейр следует спустить и правильно установить 7-дюймовую эксплуатационную обсадную колонну с перекрыванием для предотвращения возможного сообщения между нижними водоносными зонами и приповерхностными областями поглощения.

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The authors declare that there are no conflicts of interest present.