First Use of Novel High Temperature Water-Based Reservoir Drilling Fluid to Access Depleted Deepwater Reserves

Morrison, Alexandra; King, Conan; Rodrigue, Kevin

doi:10.2118/207825-ms

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…During drilling, the drilling fluid is exposed to continuous agitation, pressure changes, temperature variations, and interactions with formation fluids and solids. Dynamic aging tests aim to replicate these conditions by subjecting the drilling fluid to mechanical shear forces, temperature cycling, and chemical reactions over a specified period. , …”

Section: Methodsmentioning

confidence: 99%

Biogenic Copper Oxide Nanoparticles for Improved Lubricity and Filtration Control in Water-Based Drilling Mud

Bardhan,

Singh,

Nishanta

et al. 2024

Energy Fuels

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The exigency for efficient drilling fluids (mud) in the oil and gas industry has prompted the development of novel additives to address challenges encountered in high-temperature wells. Copper oxide nanoparticles (CuO NPs) possess distinctive characteristics, including low toxicity and exceptional thermal stability. This study explored the synthesis of CuO NPs using a natural extract from Colocasia esculenta leaves. The extract is abundant in phytochemicals and serves as both reducing and capping agents. The potential of the biogenic CuO NPs to enhance the lubricity in mud has been explored for the first time. Their ability to form a continuous and thin lubricating film at the muddrill string interface is expected to reduce the frictional resistance between them significantly. Besides this, the filtration and rheological performance of the developed mud have also been investigated. The formulation exhibited significant enhancements in lubricity, with a 27% increase, and filtering performance, with a 48% increase. The rheological profile, which exhibited shearthinning behavior, demonstrated strong agreement with the Herschel−Bulkley model. Furthermore, the NPs showed the capability of reducing the negative effects of heat-induced deterioration on the characteristics of mud. This highlights their potential as advantageous substances for drilling operations conducted at high temperatures. The results emphasize the advancement of drilling fluid technologies that are both environmentally benign and economically feasible by utilizing the advantages of biogenic CuO NPs. This study aims to enhance green chemistry methodologies in the oil and gas sector by tackling issues related to both performance and sustainability.

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Section: Methodsmentioning

confidence: 99%

Biogenic Copper Oxide Nanoparticles for Improved Lubricity and Filtration Control in Water-Based Drilling Mud

Bardhan,

Singh,

Nishanta

et al. 2024

Energy Fuels

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Wireline Logging in High Overbalance High-Temperature High-Pressure Deepwater Gulf of Mexico Well with Water-Based Reservoir Drilling Fluid

Tjioe

McCaslin

Brege

et al. 2022

SPE Annual Technical Conference and Exhibition

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Open hole wireline logging, due to its lower overpull capacity relative to logging-while-drilling, is subject to increased stuck tool risk and can lead to costly fishing operations, lost-in-hole charges, and the need to sidetrack the borehole. The risk increases in higher overbalance environments typical for depleted reservoirs but there are other controls on sticking risk that can be managed. This paper describes the measures taken in an open hole wireline logging operation in a Deepwater Gulf of Mexico well under close to 7000 psi overbalance in a high temperature-high pressure (HTHP) slim-hole environment using water-based reservoir drilling fluid (RDF) to achieve a successfully efficient logging operation without incurring lost time attributed to conveyance related issues. A wireline program was designed that paid close attention to the RDF properties to ensure excellent fluid loss performance and a thin filter cake, a recipe to keep differential sticking in check. The target reservoir was an aeolian sandstone with a porosity of 19% and permeability in the tens of millidarcy range. Additional steps taken to mitigate sticking risks included good borehole cleaning practices, sticking assessment during drilling, use of high-pull capacity cable, minimization of tool contact area with the borehole through reduced tool string length and use of rollers and standoffs, minimization of stationary time within depleted reservoir, tension monitoring during wireline operation, and inclusion of a jar in the tool string to increase the chance of pulling free when stuck. A high temperature and pressure rated sampling tool was run in a 7″ borehole with a 25° open-hole deviation to acquire the pressure profile in the reservoir. Correlation was performed inside the casing such that the only stationary time the tool string experienced was during the pressure sampling operation. The sampling itself was limited to no more than ten minutes. As a result of the mitigation measures implemented, a total of five good pressure points were obtained in approximately 150 ft of reservoir interval. Negligible tension drop-off was observed when moving down from one pressure station to another and no overpull was observed when picking up the tools. The tool string was successfully retrieved at the surface. From the authors’ knowledge, this is the first time logging under such high overbalance has been performed with a water-based RDF. The fluid mentioned in this paper has been engineered to overcome the typical shortcomings of water-based RDF when it comes to differential sticking. Learnings from stuck tool experiences during previous wireline logging attempts in the same field will be described, providing the rationale for some of the mitigation steps pursued in this paper. The success of differential sticking mitigation during this logging program opens the door to possibilities for performing future open hole wireline logging under extreme conditions.

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A Unique High Temperature, Low Rheology Divalent Brine-Based Reservoir Drilling Fluid Improved Horizontal Drilling Performance in Hard Sandstone Formation

Kerkhoff

Ahmed

Butcher

et al. 2022

Day 1 Mon, October 31, 2022

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This paper describes how a dual function synthetic polymer (DFSP) additive was key to formulating a unique high temperature divalent brine-based reservoir drilling fluid (HT-DB-RDF), deployed to drill a horizontal slim hole interval through a hard sandstone formation. To efficiently drill this horizontal section the HT-DB-RDF was developed with the intent to improve drilling performance. The main parameter targeted for improvement was the rate of penetration (ROP) without compromising wellbore quality or increasing the risk of common drilling problems such as hole cleaning, wellbore integrity, drilling torque and differential sticking. During the well planning phase, different fluid formulations, qualification approaches and field deployments were reviewed from global experience. In certain geologically similar applications, improved ROPs had been achieved using low solids and (in some instances) clear fluid systems. The most notable difference between the planned application and offset experience was the bottom hole temperature (155°C) and fluid density that was required (1.32 SG). A fluids design framework was developed from the offset well analysis and available pre-drill data. Reservoir Drilling Fluid technologies were evaluated, and laboratory work was performed to develop the system. Detailed hydraulics modelling was performed during the planning phase to confirm that the HT-DB-RDF could deliver the required performance under the planned conditions. High flow rates and low rheology were required for turbulent flow in the annulus to transport cuttings, maximizing hydraulic power to the downhole tools and drill bit and enhancing ROP. The success of the HT-DB-RDF was assessed during execution of the well. Downhole fluid properties were used to model drill string hydraulics, equivalent circulating density (ECD) and hole cleaning ahead of the bit under the drilling conditions. Outcomes were compared to pressure-while-drilling data at the rig site to detect trends indicating poor hole cleaning. The results showed a maximum 0.01 SG variance between modelled and measured ECD, and smooth trips illustrated a clean and stable wellbore throughout. Non-fluid related operational issues resulted in a longer time to drill the interval and extended static periods during trips. The HT-DB-RDF exhibited resilience during elevated downhole temperatures. The average ROP recorded during drilling was eight times higher than the previous ROP achieved drilling horizontal offset wells. The key technology that enabled fluid development and execution of the well was the DFSP that delivered both high temperature fluid loss control and hole cleaning capabilities. The DFSP features strongly bonded chemical linkages and cross-linked chains which achieve exceptional performance in divalent brine, facilitating high fluid densities with low solids content to maximize performance.

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First Use of Novel High Temperature Water-Based Reservoir Drilling Fluid to Access Depleted Deepwater Reserves

Cited by 4 publications

References 5 publications

Biogenic Copper Oxide Nanoparticles for Improved Lubricity and Filtration Control in Water-Based Drilling Mud

Biogenic Copper Oxide Nanoparticles for Improved Lubricity and Filtration Control in Water-Based Drilling Mud

Wireline Logging in High Overbalance High-Temperature High-Pressure Deepwater Gulf of Mexico Well with Water-Based Reservoir Drilling Fluid

A Unique High Temperature, Low Rheology Divalent Brine-Based Reservoir Drilling Fluid Improved Horizontal Drilling Performance in Hard Sandstone Formation

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