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Wellbore integrity
There are different definitions of what is Well Integrity. The most widely accepted definition is given by NORSOK D-010: "Application of technical, operational and organizational solutions to reduce risk of uncontrolled release of formation fluids throughout the life cycle of a well."[1] Other accepted definition is given by ISO TS 16530-2 "Containment and the prevention of the escape of fluids (i.e. Well Integrity is a multidisciplinary approach. Therefore, well integrity engineers need to interact constantly with different disciplines to assess the status of well barriers and well barrier envelopes at all times.
- North America > United States (0.68)
- Asia > Middle East > Qatar (0.28)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Completion > Well Integrity (1.00)
- Health, Safety, Environment & Sustainability > Safety > Operational safety (1.00)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
When it comes to operational integrity, there is no compromise: Sustained annulus pressure is one of the major challenges affecting well integrity management. Continuous, real-time remote monitoring of annulus pressure and temperature and the ability to remotely perform a controlled vent of annulus pressure buildup helps operators mitigate the situation before it could become critical, enabling faster reaction and reducing exposure of people to hazardous areas and related travel to the site. Maintaining a specific annulus pressure through remote monitoring and control is highly desirable in certain applications, such as the optimization of ESP artificial lift. Join us for this SPE Tech Talk with SLB where we discuss ways operators can manage sustained annulus pressure and maintain well integrity.
- Well Drilling > Wellbore Design > Wellbore integrity (0.69)
- Production and Well Operations (0.69)
When it comes to operational integrity, there is no compromise: Sustained annulus pressure is one of the major challenges affecting well integrity management. Continuous, real-time remote monitoring of annulus pressure and temperature and the ability to remotely perform a controlled vent of annulus pressure buildup helps operators mitigate the situation before it could become critical, enabling faster reaction and reducing exposure of people to hazardous areas and related travel to the site. Maintaining a specific annulus pressure through remote monitoring and control is highly desirable in certain applications, such as the optimization of ESP artificial lift. Join us for this SPE Tech Talk with SLB where we discuss ways operators can manage sustained annulus pressure and maintain well integrity. Held on Thursday, 18 May 2023 0800-0830 hours CT (UTC -5) Register below to watch the Tech Talk.
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Well Drilling > Wellbore Design > Wellbore integrity (0.67)
- Production and Well Operations (0.67)
ABSTRACT Distributed acoustic sensing (DAS) is a technology that enables continuous, real-time measurements along the entire length of a fiber-optic cable. The low-frequency band of DAS can be used to analyze hydraulic fracture geometry and growth. In this study, the low-frequency strain waterfall plots with their corresponding pumping curves were analyzed to obtain information on fracture azimuth, propagation speed, number of fractures created in each stage, and restimulation of preexisting fractures. We also use a simple geomechanical model to predict fracture growth rates while accounting for changes in treatment parameters. As expected, the hydraulic fractures principally propagate perpendicular to the treated well, that is, parallel to the direction of maximum horizontal stress. During many stages, multiple frac hits are visible, indicating that multiple parallel fractures are created and/or reopened. Secondary fractures deviate toward the heel of the well, likely due to the cumulative stress shadow caused by previous and current stages. The presence of heart-shaped tips reveals that some stress and/or material barrier is overcome by the hydraulic fracture. The lobes of the heart are best explained by the shear stresses at 45° angles from the fracture tip instead of the tensile stresses directly ahead of the tip. Antennas ahead of the fracture hits indicate the reopening of preexisting fractures. Tails in the waterfall plots provide information on the continued opening, closing, and interaction of the hydraulic fractures within the fracture domain and stage domain corridors. The analysis of the low-frequency DAS plots thus provides in-depth insights into the rock deformation and rock-fluid interaction processes occurring close to the observation well.
- North America > Canada > British Columbia > Western Canada Sedimentary Basin > Alberta Basin > Montney Formation Field > Montney Formation (0.99)
- North America > Canada > British Columbia > Western Canada Sedimentary Basin > Alberta Basin > Montney Formation (0.99)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Greater Peace River High Basin > Pouce Coupe Field (0.99)
- (2 more...)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Production logging (1.00)
It will be demonstrated that geomechanics adds value in all phases of exploration, development and production. Provides a conceptual framework for petroleum geomechanics which emphasizes fundamental concepts, properties, Earth stresses and data inputs that contribute to Mechanical Earth Models (MEM).
- Well Drilling > Wellbore Design > Wellbore integrity (0.99)
- Reservoir Description and Dynamics (0.93)
Critical drilling issues are usually associated with convergence of pore and fracture pressure, and are intimately connected to the downhole behavior of drilling fluids and uncertainties associated with predicting their behavior during well construction. Top areas of operational concerns, such as lost circulation, hole-cleaning, barite sag, wellbore stability, stuck pipe, etc. all share a common thread in hydraulics, and continue to plague drilling operations and efficiencies. From shallow sections to well completions, the drilling fluid and its imposed pressures represent the primary barrier for well control, and fluid hydraulics affects every stage of well construction. Current measurements provide at best a partial view of downhole pressure windows, and software technologies are necessary to fill in the gaps. A classic example includes optimum speeds for running casing where no downhole measurements currently exist.
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Fluids and Materials > Drilling fluid management & disposal (0.88)
Upon completing this Learning Module assignment, the participant should be able to apply rock mechanics fundamentals to describe well, reservoir and production behavior and define the following rock mechanical properties under various conditions of confining pressure, describe how these properties influence wellbore stability, directional drilling considerations, well completion design and other aspects of reservoir development, and know how they are measured in the laboratory: Brinell hardness, tensile strength, normal/shear stress relationships and failure mechanisms (Mohr circles), Young's modulus, Poisson's ratio, compressive strength, and shear strength.
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Wellbore Design > Rock properties (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
Abstract One of the challenges encountered in hydraulic fracturing of unconventional resources is casing deformation. Casing deformation statistics vary across different regions of the world, but it is estimated to affect 20-30% of horizontal wells in some areas of operations. The consequences of casing failures can be varied but, in many cases, it affects the well production, wellbore accessibility and in some rare instances presents a situation of well control and its associated risks. Incidentally, most literature on casing deformation pertains to "plug & perf" fracturing operations in cemented completions though pipe deformation is known to occur in multi-stage fracturing (MSF) sleeves type of openhole completions as well. Intuitively, the two failure mechanisms may appear similar instead they represent very diverse well conditions that lead to pipe deformation. Tubular damage during fracturing is not caused by a single, consistent reason. Multiple mechanisms may be responsible for casing deformation; formation rock properties, wellbore configuration, cyclic loads acting on the tubulars, tubular quality, cement bond, or simply some operational aspects during drilling and completion conducive to pipe deformation. Tubing stresses analysis of the lower completion and especially of the individual components of the openhole MSF completion is seldom done. A comprehensive study was initiated by first validating the key data and parameters, multi-arm caliper data in conjunction with downhole camera imaging, and review of the physical mill-out patterns of frac plugs (in cased hole completions) and ball-seats used in MSFs to understand the damage pattern. This work was supported by detailed geo-mechanical properties profiles, diagnostic injection tests analysis, and evaluation of casing integrity under anticipated fracture loads. One of the primary learnings from this study was that wellbore quality had a significant bearing on the post-frac wellbore integrity for both types of well completions. The study indicated that well profile, design, and tool placement in the well also had a strong influence on axial load distribution in open-hole multistage completions. The mode of failure in openhole multistage wells was different than those seen in cemented liners. These differences do not necessarily fall under the domain of formation movement experienced in geomechanically complex and tectonically active areas. Since reservoir uncertainties are a reality, a good wellbore quality cannot always be guaranteed. It becomes necessary to manage pipe deformation with mitigating practices. This paper provides practical solutions to pipe deformation in cemented and openhole completions. The operational workflows allow upfront assessment with analytical tools to model the stress loads. By understanding the primary factors that affect well integrity, the likelihood of casing failure can be predicted and avoided ahead of time, save fracturing costs across high-risk areas, and not jeopardize production from multimillion-dollar completions. Managing well integrity is essential for development of hydrocarbon resources while preserving the environment and assuring safety of personnel.
- Asia > Middle East (0.68)
- North America > United States > Texas > Harris County > Houston (0.28)
- South America > Argentina > Patagonia > Neuquén > Neuquen Basin > Vaca Muerta Shale Formation (0.99)
- South America > Argentina > Patagonia > Neuquén > Neuquen Basin > Loma Campana Field > Vaca Muerta Shale Formation (0.99)
- South America > Argentina > Patagonia > Neuquén > Neuquen Basin > Loma Campana Field > Lower Agrio Formation (0.99)
- (2 more...)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Completion > Well Integrity > Zonal isolation (1.00)
- (4 more...)
Protecting Parent-Well Production Using Far-Field Diverters in Unconventional Wells
Ajisafe, F. O. (Liberty Energy, Houston, Texas, United States) | Porter, H. (Lime Rock Resources, Houston, Texas, United States) | Kothare, S. (Lime Rock Resources, Houston, Texas, United States) | Colson, E. (Lime Rock Resources, Houston, Texas, United States) | Ellis, R. (Liberty Energy, Houston, Texas, United States) | Heaton, N. (Liberty Energy, Houston, Texas, United States) | Demars, B. (Liberty Energy, Houston, Texas, United States) | Mayerhofer, M. (Liberty Energy, Houston, Texas, United States)
Abstract The impact of fracture driven interaction (FDI) is an increasing concern in mature developed unconventional plays in the US. In this study, parent well production performance after infill well stimulation is evaluated to understand the effectiveness of far-field diverter in mitigating FDI's. Studies to determine if FDI's result in a negative or positive impact, have concluded that it varies from basin-to-basin (Miller et al 2016). In this project, the purpose of pumping far-field diverter is to mitigate wellbore sanding and production loss in existing parent wells. The far-field diverter pill includes a blend of multimodal particles to bridge the fracture tip, preventing excessive fracture length and height growth. Fracture modeling with a unique particle transport model is typically used to design the far-field diverter pill impact on fracture geometry. The pill design and contingency designs are executed in the infill well stimulation job, right after the pad step, in the beginning of the pump schedule. Optimization of the far-field diverter can be complemented with real-time pressure monitoring or cross-well fiber strain data on the parent well. Over the years, far-field diverter has, in one form or the other, been used for various applications in stimulation design. However, since mid-2010's, far-field diverter has been used to address growing concerns of FDI's observed in most mature plays in the US. In this study, since 2018, far-field diverters have been pumped in several wells for the purpose of mitigating the negative impact of FDI's between parent and child wells. While these jobs were operational successes, the next crucial step was to evaluate and quantify the effectiveness of the far-field diverter in mitigating production loss in the parent wells. It is important to note that the operator whose wells utilized far-field diverters, had experienced negative impact of FDI's in their parent wells in the form of production loss and sand in the wellbore which required clean outs at a significant cost. In this study, production data was evaluated comparing pre-stimulation production before shut-in and post-stimulation production after the parent wells were brought back online. Overall, about 75% of the parent wells protected show positive uplift in oil production. And about 80% of the child wells show superior or comparable production decline after about a year of production when compared with offset parent wells It is evident that far-field diverters for fracture geometry control in child wells can be extremely helpful in mitigating negative impact of FDI's. In unconventional reservoirs, where infill (child) well drilling is prevalent, the impact of far-field diverter in controlling fracture geometry has the potential to be a value added FDI mitigation technology to mitigate wellbore sanding and subsequent clean outs as well as optimize production performance of both child and parent wells. The early part of the project resulted in ~$2.5million in savings in well cleanup costs. In addition, fracture diagnostics along with production data evaluation can be highly beneficial in understanding the role of production depletion, completion design and well spacing on fracture driven interaction.
- North America > United States > North Dakota (1.00)
- North America > Canada > Saskatchewan (0.80)
- Geology > Geological Subdiscipline (0.46)
- Geology > Petroleum Play Type > Unconventional Play (0.34)
- North America > United States > North Dakota > Williston Basin > Lodgepole Formation (0.99)
- North America > United States > North Dakota > Williston Basin > Bakken Shale Formation > Middle Bakken Shale Formation (0.99)
- North America > United States > South Dakota > Williston Basin > Bakken Shale Formation (0.97)
- (3 more...)
Research Status and Development Prospect of Wellbore Integrity in China
Zhang, Zhi (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) (Corresponding author)) | Zhao, Yuanjin (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University)) | Cai, Nan (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University)) | Xiang, Shilin (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University)) | Ding, Chenyu (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University))
Summary As the exploration and development of oil and gas move into increasingly challenging locations and harsher environments, well integrity becomes more difficult to maintain. High temperatures, pressures, and corrosion can all contribute to wellbore integrity failure. Such failures can have significant financial and environmental consequences, including gas leakage and fluid spills. In this paper, we review the development and technical advancements of wellbore integrity research both in China and abroad and look forward to the development direction of wellbore integrity in China. We provide basic background knowledge for those interested in wellbore integrity and also share the progress and development direction of integrity research for wellbore integrity researchers. Through research and analysis, some conclusions can be drawn. Countries around the world are actively studying wellbore integrity and have developed a large number of standards, especially the United States and Norway, which have the most standards. The most common way to analyze wellbore integrity is to first divide the entire wellbore into different wellbore barrier units according to different standards, such as ISO 16530-1, and then study risk factors and integrity management measures in different units. Mainstream research is mostly carried out around the integrity of casing, cement, and tubing, and many achievements have been made, but the study of packer and downhole safety valve is still on the way. Wellbore integrity risk assessment aims to quantify potential risks and establish risk levels to support decision-making for on-site wellbore integrity control. This is achieved by identifying factors affecting wellbore integrity, establishing an evaluation index system and processing evaluation indicators to determine failure probability and impact consequences. The resulting risk value can be divided into different areas using the “as low as reasonably practicable principle” or a risk matrix graph. However, due to the complexity of the factors involved and the subjectivity of risk classification rules, there are still challenges in promoting the evaluation model and reducing errors in the evaluation results. China should actively promote interdisciplinary integration and respond to the call for “dual carbon goals” to break through the current bottleneck in wellbore integrity research. This can be achieved by promoting the development of quantitative wellbore integrity risk assessment methods, developing supporting evaluation software based on big data, and by tackling the integrity challenges faced by different types of wells and promoting the development of wellbore integrity discipline.
- North America > United States > Texas (0.67)
- Asia > China > Sichuan Province (0.46)
- Overview (0.48)
- Research Report (0.46)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.93)
- South America > Suriname > North Atlantic Ocean > Guyana-Suriname Basin > Tambaredjo Field (0.99)
- South America > Guyana > North Atlantic Ocean > Guyana-Suriname Basin > Tambaredjo Field (0.99)
- North America > United States > Texas > Fort Worth Basin > Northwest Field (0.99)
- (19 more...)