Browsing OU - Dissertations by Author "Salehi, Saeed"
Now showing items 1-18 of 18
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BARITE SAG UNDER DYNAMIC AND ELEVATED TEMPERATURE CONDITIONS: EXPERIMENTAL STUDIES AND MATHEMATICAL MODELING
Fakoya, Muili Feyisitan (2019-05-10)Barite sag is an undesired occurrence that causes density variation in the wellbore. It is a problem that is related to both fluid property (mainly rheology) and drilling practices, and it arises mostly in invert emulsion ... -
Development of polymer gel systems for lost circulation treatment and wellbore strengthening
Magzoub, Musaab (2021-05-07)Lost circulation is a frequent problem and a significant contributor to the non-productive time (NPT) in the drilling operation. Field reports and experimental studies have revealed that conventional solutions are doomed ... -
DRAINAGE BEHAVIOR OF AQUEOUS, POLYMERIC, AND OIL-BASED NITROGEN FOAMS: THEORETICAL AND EXPERIMENTAL INVESTIGATION
Govindu, Abhishek (2019-08-01)Foams can be formulated to have a wide range of densities and viscosities. This unique behavior makes foam suitable for underbalanced drilling where pressure exerted on formation is maintained below pore pressure and at ... -
DYNAMIC DRILLING FLUIDS LOSS AND FILTRATION: IMPACT OF DYNAMIC WELLBORE CONDITIONS AND WELLBORE STRENGTHENING IMPLICATIONS
Ezeakacha, Chinedum Peter (2018-12-14)Lost circulation (drilling fluid loss) and mud filtration have been investigated over the years because they lead to non-drilling time (NDT) and increase the overall well cost. It is usually the first source of damage to ... -
EVALUATION OF LINER HANGER SEAL ASSEMBLY AND CEMENT SHEATH AS A DUAL BARRIER SYSTEM: IMPLICATIONS FOR INDUSTRY AND REGULATORS
Ahmed, Shawgi (2020-05-08)Robust dual barrier systems are crucial for well integrity. Regulators and industry have consistently raised the concerns in such systems regarding the testing, qualification, and prediction of leakage pathways and failure ... -
Experimental and advanced computational modelling study of downhole elastomer seal assemblies
Patel, Harshkumar (2020-05)Elastomers seals are widely used in various drilling, completion, and production equipment. One such equipment is liner hanger which has become integral part of modern well designs. Failure of liner hanger seal assembly ... -
Experimental and numerical evaluation of shape memory polymer for lost circulation treatment in geothermal wells
Mohamed, Abdelmjeed (2022)Lost circulation presents formidable challenges to drilling operations, especially in high-temperature and fractured formations. Lost circulation events increase the nonproductive time (NPT) and the total cost of drilling ... -
Experimental, analytical, and numerical investigations of gas leakage through annular cement
Al Ramadan, Mustafa (2020)Cementing operations present many difficulties worldwide attributable to shallow flows. Cement sheath integrity and durability play key roles in the oil and gas industry, particularly during the drilling and completion ... -
An Experimental, Modeling and Machine Learning Based Investigation of Stick-Slip Vibrations
Srivastava, Saket (2022-08-04)Drilling technologies have improved considerably since the first well drilled by Colonel E.L Drake in 1859. Drilling technologies enable us to safely drill complex well profiles with advanced downhole tools and sensors to ... -
General Risk Literacy Skills are Causally Related to Improved Self-Evaluations: Training Graph Literacy Improves Decision Making and Lowers Overconfidence
Ybarra, Vincent (2021-05-14)Overconfidence commonly refers to a cognitive bias in which people express more subjective confidence in their abilities than can be objectively justified. Similarly, the “Unskilled and Unaware” literature demonstrates ... -
Investigation of Hydraulic and Mechanical Cement Integrity: An Advanced Computational Study
Wu, Yuxing (2021)Cement sheath is a significant barrier to maintain the zonal isolation of wells, preventing severe consequences such as kick (or influx) accidents, environmental contaminations, and safety threats. Many previous investigations ... -
Long term experimental investigation for leakage and permeability of the cement-casing microannulus
Al Ramis, Hussain (2021-05-14)The oil and gas industry is the primary provider of energy globally. Energy extraction from wells takes place through several stages, such as exploration, drilling and production, and then plugging and abandonment. The ... -
Numerical simulations of wellbore cement sheath microannuli leakage in Gulf of Mexico wells
Wise, Jarrett (2021-02-25)The Gulf of Mexico (GoM) is home to more than 50,000 oil and gas wells with approximately 30,000 wells that are plugged and abandoned leading to concerns of oil and gas leakage where currently, little to no monitoring is ... -
PORE-NETWORK MODELING AND ANALYSIS OF LABORATORY INDUCED HYDRAULIC FRACTURES
Agrawal, Abhishek (2018-05)Well stimulation is undertaken to reduce the restriction to flow in a reservoir. Among all the well stimulation techniques, hydraulic fracturing is one of the most widely employed techniques due to the development of shale ... -
STUDY OF FLUID DYNAMICS EFFECTS FOR LOSS OF WELL CONTROL INCIDENTS IN SUBSEA WELLS
Kiran, Raj (2019-05-10)The safety of well operations has become the focal point of the research paradigm since the Deepwater Horizon incident. The risks of wellbore blowouts cannot be neglected in any drilling operation, which makes the discharge ... -
Thermal performance of sandstone reservoirs for thermal energy storage: an integrated experimental and analytical study
Vivas, Cesar (2023-12)With the global plans of decarbonization in motion, major energy players and large oil and gas (O&G) companies are moving towards increasing energy generation from non-fossil sources. The implementation of renewable energy ... -
Validation and field testing of an all-digital pressure sensor for permanent, distributed downhole measurements
Yuan, Na (2024-05-15)The importance of downhole pressure sensing has risen significantly in oil and gas operations. Improvements in downhole sensing technology are expected to positively impact drilling, stimulation, production forecasting, ... -
Wellbore Cleanout in Inclined and Horizontal Wellbores – The Effects of Fluid Rheology, Inclination, and Solids Density.
Pandya, Soham (2019-08-30)Recent technical improvements in the drilling process have allowed drilling of high inclination and horizontal wells with longer laterals. The frequency of such wells has increased over time due to their advantage of ...