Article
Engineering, Multidisciplinary
Liangliang Ding, Xiao Yang, Wenkang Chen, Shuai Li, Qiang Zhang
Summary: The depth of the annular liquid level is influenced by various factors such as wellhead temperature, initial tubing-casing annulus pressure, and the amount of gas released in the annulus. The prediction model improves the accuracy of predicting the annulus liquid level depth.
Article
Engineering, Chemical
Hao Wang, Mu Li, Qing Zhao, Weiwei Hao, Hui Zhang, Yafei Li, Pengpeng Huang, Yi Zou
Summary: Annular pressure buildup (APB) caused by temperature increase in high-temperature wells poses a threat to wellbore integrity. This paper presents methods for casing safety evaluation and APB management, taking into account thermal stress and APB effects. The research emphasizes the importance of maintaining APB within a safe range and suggests injecting nitrogen and installing rupture disks as effective mitigation methods.
Article
Mechanics
Liangliang Ding, Wenkang Chen, Chuanjun Han, Shuai Li, Qiang Zhang
Summary: This research focuses on predicting sustained casing pressure (SCP) in the tubing-casing annulus and studying its influencing factors, including the migration of gas. A prediction model and a numerical model are developed to accurately describe the SCP process. The results provide valuable insights into the impact of tubing leakage and gas migration on SCP.
Article
Energy & Fuels
Yuhong Xie, Min Ouyang, Hu Zhao, Lie Li, Yingtao Feng
Summary: The study demonstrates that managed wellbore pressure casing running technique can effectively reduce the risk of failure and improve the efficiency of casing running process. By accurately calculating dynamic surge-swab pressure and adjusting mud level accordingly to control the wellbore pressure, successful casing running operation can be achieved.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
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
Energy & Fuels
Hao Wang, Hui Zhang, Jun Li, Tengfei Sun
Summary: A novel model considering the effect of cement was proposed to predict annular pressure buildup caused by temperature increase in marine fossil energy production. The research showed that cement has a significant effect on annular pressure buildup, and ignoring cement may bring potential danger. Adjusting the height of cement and gas or foam injection are effective methods for mitigating annular pressure buildup.
ENERGY SCIENCE & ENGINEERING
(2022)
Article
Engineering, Petroleum
Kui Liu, Shidong Ding, Shiming Zhou, Qian Tao, Linhai Zhong, Rengguang Liu, Deli Gao
Summary: This study investigates the main reasons for APB problems in shale gas wells and the mechanism by which the PABP method increases the sealing ability of the cement sheath. Experimental results demonstrate the impact of various factors on the effectiveness of the PABP method.
Article
Geochemistry & Geophysics
Ninghui Dou, Zhiqiang Hu, Zhiyuan Wang, Hanpin He, Shunhui Yang
Summary: CO2 sequestration is an effective technology to mitigate the greenhouse effect, and ensuring the wellbore integrity is crucial for successful CCUS. Failure to diagnose tubing leakage in offshore gas wells with high CO2 in a timely manner can lead to annular pressure risks and wellbore corrosion problems. The pressure rise process and leakage rate are influenced by the depth and equivalent size of the leakage point. This study provides reference for wellbore integrity design and management to reduce CO2 leakage risk caused by wellbore integrity failure.
Article
Energy & Fuels
Ianto O. Martins, Alexandre K. da Silva, Emilio C. C. M. Silva, A. Rashid Hasan, Jader R. Barbosa
Summary: This study presents a new transient thermo-structural model to predict the pressure and temperature distributions of annular fluids during injection operations in oil wells. The model shows good agreement with field data, indicating its accuracy in predicting the behavior of annular fluids.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Chenwang Gu, Xiaorong Li, Yongcun Feng, Jingen Deng, Kenneth Gray
Summary: This research investigates the problem of sustained casing pressure in shale gas development, specifically focusing on the debonding of the cement sheath. A finite-element model is constructed to evaluate the sealability of the cement interface throughout the life cycle of a well, considering the hardening and shrinking of the cement sheath. The study finds that the shrinkage of the cement sheath is the main factor causing the debonding of the cement interface and analyzes the influence of well trajectory, casing eccentricity, cement sheath voids, and residual drilling fluid pressure on the debonding. The results provide insights into predicting wellbore integrity failure and offer guidance for engineering operations.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Energy & Fuels
Hao Wang, Hui Zhang, Jun Li, Anming Chen, Jun Liu, Tengfei Sun, Cong Lin
Summary: In the offshore industry, a radial full-size physical experiment of APB was conducted to study the formation of APB and provide a basis for field operation design. An annular pressure prediction model based on dissolved gas was proposed, showing higher accuracy than the full-liquid model. The study also emphasized caution when using the simplification of the full-liquid model and highlighted the impact of casing deformation on prediction accuracy.
Article
Energy & Fuels
Arthur P. da Veiga, Ianto O. Martins, Johann G. A. Barcelos, Marcus Vinicius D. Ferreira, Eduardo B. D. M. Alves, Alexandre K. da Silva, A. Rashid Hasan, Jader R. Barbosa
Summary: This article presents a comprehensive multiphysics routine for calculating Annular Pressure Buildup in vertical oil wells, which couples three key aspects influencing APB occurrence. Comparing with actual data, good agreement is observed between numerical predictions and field measurements.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Yan Yang, Lukuan Li, Wenyan Yu, Yan Zhou, Kuanliang Zhu, Bin Yuan
Summary: The paper proposes an evaluation system for the sealing ability of the cement-casing interface and cement matrix, which is based on a permeability testing device and a model predicting the breakthrough pressure. The breakthrough pressure of the interfacial transition zone (ITZ) is found to be much smaller than that of the cement matrix. Latex, resin, and elastic materials can increase the breakthrough pressure of the cement matrix, while expansive cement has a higher breakthrough pressure of ITZ, indicating an improvement in the interface sealing ability.
Article
Energy & Fuels
Duo Hou, Zhi Zhang, Yanan Geng, Jiaping Yue, Zhiqiang Wu
Summary: The main purpose of this study is to investigate the critical leakage pressure of the casing cement sheath stratum assembly for cyclic alternating thermal effect in thermal recovery wells, and provide technical measures for sealing integrity. The researchers established a device to evaluate the sealing integrity in a high-temperature, high-pressure cyclic alternating environment, and conducted experiments under different working conditions. The study reveals the key characteristics of the assembly and proposes technical measures to improve the sealing integrity of the wellbore.
Article
Engineering, Environmental
Duo Hou, Zhi Zhang, Yanan Geng, Zhiqiang Wu, Huabo Yang
Summary: This paper establishes an evaluation device for channeling-leakage properties of a CCS assembly in deep wells. It explores the relationships between the channeling-leakage properties of the assembly and the damage to the cementing interfaces as well as the cracking characteristics of the cement sheath. The findings provide a theoretical basis and testing method for evaluating wellbore sealing integrity and formulating technical safety measures.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)