Article
Energy & Fuels
Efecan Demirci, Andrew Wojtanowicz
Summary: This article introduces a buoyant kill technique for removing sustained casing pressure (SCP) and verifies its feasibility through a field-scale demonstration experiment. The experimental results show that controlling wellhead pressure and injection pump operation are crucial for successful SCP removal.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Mohammad Kazemi, Andrew K. Wojtanowicz
Summary: This article discusses the deficiencies of the pressure bleed-down/build-up (B/B) testing and analysis methods for gas-leaking wells with Sustained Casing Pressure (SCP), and proposes an approach using mathematical models to match different stages of the test data, improving the reliability of the results.
Article
Chemistry, Multidisciplinary
Shuangjin Zheng, Chuhao Wu, Chao Wang, Yi Huang, Haodong Chen, Haopeng Zheng
Summary: This study investigated the influence of casing eccentricity on the mechanical integrity of cement sheaths in fractured wells, proposing measures to safeguard the integrity of cement sheaths under casing eccentric conditions. The results show that casing eccentricity can lead to stress concentration and failure of the cement sheath, with specific recommendations on how to prevent mechanical integrity failure. This research provides important technical insights for optimizing the casing center degree.
Article
Chemistry, Multidisciplinary
Mobeen Murtaza, Zeeshan Tariq, Muhammad Kalimur Rahman, Muhammad Shahzad Kamal, Mohamed Mahmoud
Summary: A novel expandable cement system containing silicate aqueous alkali alumino silicate (AAAS) and zinc metal slurry, along with class G cement, was introduced to prevent annulus flow between the casing and formation. The reaction and expansion of the system can be controlled by optimizing the quantities of silicate systems and metal slurry, with potential applications in preventing annulus flow and addressing safety issues associated with sustained casing pressure (SCP).
Article
Chemistry, Physical
Ahmed Al-Yaseri, Ahmed Fatah, Lingping Zeng, Ammar Al-Ramadhan, Mohammad Sarmadivaleh, Quan Xie
Summary: Underground hydrogen storage is a promising technology for achieving a hydrogen economy and carbon net-zero energy transition. This study investigates the reactions between hydrogen and cement and their impact on cement integrity through hydrogen injection experiments. The results show low reactivity of hydrogen with cement and minor changes in the physical properties of cement. The increase in cement weight and density with hydrogen injection suggests a promotion of high density product precipitation but has limited impact on cement integrity, making it favorable for underground hydrogen storage.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Xiaorong Li, Yijin Zeng, Nguu Dickson Muchiri, Wei Yan, Yongcun Feng
Summary: The integrity of the cement sheath and the interface bonds of the cement-casing-formation system are critical for the safety of oil and gas wells. While distributed acoustic sensing (DAS) technology provides an opportunity for real-time monitoring of cement sheath integrity, there is still a need for further research and development to fully realize its potential in well integrity management.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Xiao-Rong Li, Chen-Wang Gu, Ze-Chen Ding, Yong-Cun Feng
Summary: The paper presents a coupled THM modeling approach to quantify the potential of cement failure under mechanically and thermally induced stress during the life-of-well. A staged finite-element procedure is used to consider sequential stress and displacement development during each stage of the well life. The model provides a comprehensive understanding of the stress states and state variables at each well stage, eliminating the need to guess the initial stress and strain state.
Article
Engineering, Environmental
Yujia Min, Scott Montross, Richard Spaulding, Meghan Brandi, Nicolas Huerta, Randal Thomas, Barbara Kutchko
Summary: This study investigated the self-sealing properties of foamed cement under dynamic flow conditions using CO2-saturated water for the first time. The formation of CaCO3 precipitates in pore spaces and fractures led to a decrease in permeability by 1 order of magnitude. The extent of self-sealing in foamed cement samples was found to be similar to that of conventional cements, possibly due to the greater alteration depth in foamed cement compensating for differences in material properties.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Fabiano Guimaraes
Summary: This study presents a time-domain solution for analyzing the dynamic behavior of drilling and casing strings, aiding in evaluating system stresses and integrity ranges during platform drift-off. The findings indicate that the fully coupled dynamics of drilling and casing are more accurate than the quasi-static approach, providing reasonable results with reduced computational effort.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Engineering, Geological
Xun Xi, Shangtong Yang, Zoe Shipton, Meifeng Cai
Summary: This study develops a combined analytical-numerical model to investigate the effects of the combined casing-cementing-rock structure on pressure transmission in near-wellbore rock fracture. The model considers the boundary condition imposed by the complete well system. The results show that enhancing pressure transmission through the well structure leads to closer fracture propagation to the perforation orientation, with smaller deflection angle and increased breakdown pressure. The study also explores the effects of well configurations, casing and cement thickness, and Young's modulus on near-well tortuosity and investigates the impact of in-situ stress condition and perforation angle and length on near-well cracking.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Construction & Building Technology
Mohammad Fatehi Marji, Hatef Yousofian, Hamid Soltanian, Yaser Pourmazaheri, Abolfazl Abdollahipour
Summary: By hybridizing multi walled carbon nanotubes (MWCNTs) and styrene-butadiene-styrene (SBS), the mechanical properties and breakage behaviors of oil-and gas-well cements were improved, enhancing their durability and crack resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Geochemistry & Geophysics
Hu Yang, Penggao Zhou, Chao Xiong, Shifu Yu, Jiancai Li
Summary: Horizontal well volume fracturing is the main technology for effective unconventional oil and gas development. The study established an elastic model for cement sheath failure in horizontal well sections, finding that the main failure modes are radial compression or circumferential tensile failure during fracturing and microclearance failure during flowback. The findings help predict cement sheath failure and understand the impact of different operation parameters on interlayer sealing in horizontal wells.
Article
Energy & Fuels
Jingpeng Wang, Wei Zhang, Lin Song, Jiwei Wu, Yanxian Wu
Summary: This article focuses on the influence of high temperature, high pressure, and ultra-deep well reservoir renovation construction on wellbore barriers, particularly the impact on the cement sheath. By establishing numerical models and conducting laboratory experiments, the stress changes and distribution of the cement sheath during the fracturing process are analyzed. The research results can provide technical support for ensuring the integrity of the wellbore and designing the well structure in similar ultra-deep well development processes.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Thermodynamics
Xu Han, Fuping Feng, Jianwei Zhang
Summary: Cement seal failure is common in heavy oil thermal recovery wells, and the impact of steam stimulation on wellbore interface seal performance is unclear. A finite element model is developed to study the plastic zone formation of the cement sheath during high temperature circulation. The study quantifies the interfacial debonding and microannulus size caused by thermal stress cycling, and clarifies the effects of key parameters on the change of interface integrity. The results provide valuable insights for the design of cement parameters and engineering parameters under thermal stress cycles.
Article
Energy & Fuels
Yujie Li, Sheng Wang, Xin He, Jie Xiang
Summary: A new type of thermal insulation composite cement was successfully developed in this study, which exhibited excellent engineering application properties by incorporating thermal insulation filler and heat stabilizing material. The results of the study provide a new idea to solve the problem of heat loss in geothermal production wells from the perspective of material development.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)