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A Study of Water Jet Techniques in Radial Jet Drilling: Establishing Efficacious Communication Between Wellbore and Reservoir
Asgharzadeh, A. (Clausthal University of Technology) | Bello, O. (Clausthal University of Technology) | Grijalva, O. (Clausthal University of Technology) | Freifer, R. (Clausthal University of Technology) | Holzmann, J. (Clausthal University of Technology) | Oppelt, J. (Clausthal University of Technology)
ABSTRACT Maximizing production from producing reservoirs is the primary aim of oil companies. The conventional way to increase the production has been the well stimulation and EOR. A very well accepted method in increasing production rate is the hydraulic fracturing by which new and more efficient communications are built between the wellbore and the reservoir. In spite of its contribution to high production rate, technical restrictions and public concerns pose many barriers to carry out hydraulic fracturing. A recently revived technique called water-jet-technology utilizes water-jet under high pressure to cut, drill or perforate the formation. In this technique the communication between wellbore and reservoir is established by hitting the target-surface with continuous stream of fluid. The focus of this paper is to study the dynamics of the water jet. Understanding the dynamics of water jet and its cutting mechanism will lead to a more efficient technique. The cutting force of water jet is achieved through change of linear momentum of water stream. Addition of abrasive materials helps to obtain a greater change rate of linear momentum and leads to greater cutting force. An analysis of the jet dynamics assists in selecting best jet dynamics to accomplish the desired goals. This technique which purely relies on environmentally friendly technique, is capable of establishing efficacious channels between wellbore and reservoir depending on the mass change rate and velocity of the water stream. By means of this technique it is possible to extend the dug tunnel far enough away from the wellbore. These tunnels have high permeability, since their cross sectional area is acceptably big enough and are free of any debris. Also, a proper communication between wellbore and reservoir might eliminate the need for later stimulations, from acidizing to hydraulic and acid fracturing or at least postpone stimulation for a later time. Even if later on, hydraulic fracturing is required, through these bored holes there will be a much more efficient access to reservoir to increase the efficiency of fracking. INTRODUCTION Proper connection between the wellbore and reservoir is substantially required for efficient hydrocarbon production. The near wellbore region becomes most of the time impaired due to drilling, completion and production operations. Creating a communication which extends beyond the impaired region is a possibility to achieve efficient hydrocarbon production.
Automated While-Drilling Telemetry Systems Performance Analysis and Selection Optimization in Underbalanced Drilling Operations
Huseynov, P. (Clausthal University of Technology) | Bello, O. (Clausthal University of Technology) | Perozo, N. (Clausthal University of Technology) | Holzmann, J. (Clausthal University of Technology) | Oppelt, J. (Clausthal University of Technology)
ABSTRACT As it stands, underbalanced drilling (UBD) operation has been beneficial in exploration of hydrocarbons and production with advantages like faster drilling control of lost circulation, stuck pipe situations, minimal or less formation damages and an enhanced ability to expedite development of brown fields. In spite of its edge over conventional drilling, the techniques can be more complex as well. Thus, telemetry system is required to link downhole and surface while-drilling components transmitting and providing useful information under real time condition to the driller during drilling operations for more precise wellbore placement to ensure maximum reservoir exposure, ultimate production increment and monitoring conditions. A novel and systemic decision support system model based on distance-based approach (DBA) has been developed for performance evaluation and optimal selection of while-drilling telemetry systems for potential development of a depleted reservoir field. This aims at deliverable of reliable drilling performance resulting to deliverable of real-time downhole data collection and most importantly places the matured well with minimal non-productive time during underbalanced drilling operations. This model is solved by effective algorithm integrating objective information as related to influential parameters that aids in the appropriate selection of telemetry systems. These parameters help to achieve an optimized underbalanced drilling operation at effective and efficient economic conditions. The scientific value of this study is the development of a simplified user-friendly decision support system for telemetry systems performance evaluation and selection optimization. The proposed framework was been validated and applied to a matured reservoir for an optimum selection of telemetry techniques in underbalanced drilling operation. The result of computations displayed a similar results obtained by expert judgement demonstrating the significance effect and needs of telemetry systems.
- Asia (0.94)
- Europe (0.89)
- North America > United States > Texas (0.87)
Innovative Technique for Efficient Placement of Multi-Pattern Infill Wells Under Geological Uncertainty
Awofodu, D. (Clausthal University of Technology) | Bello, O. (Clausthal University of Technology) | Ganzer, L. (Clausthal University of Technology) | Oppelt, J. (Clausthal University of Technology) | Holzmann, J. (Clausthal University of Technology)
ABSTRACT This study presents an approach to rejuvenate brownfields that relies on the application of direct search methods to place, design and selectively perforate multi-pattern infill wells in unexploited hydrocarbon regions while considering multiple history-matched models and other geological uncertainties. The field development optimization (FDO) approach requires the definition of design parameters for efficient well placement and selective perforation using I-J-K or X-Y-Z coordinates. A commercially available reservoir simulator is used to track fluid saturation through time and determine untapped regions after decades of waterflooding. Sampling methods are applied to design parameters to screen the solution space for the best candidates, which are further optimized using three direct search optimization algorithms. In addition, we observe the influence of geological uncertainties on multi-pattern well placement and oil recovery maximization. Oil recovery maximization and overall optimization time are compared for all three optimization methods evaluated. Fluid saturation distribution realized after model validation reveals unexploited regions for multi-pattern well placement by computing and inspecting the product of permeability-by-thickness-by-fluid saturation per grid-block. Optimization algorithms applied to the FDO problem show tendencies for multi-pattern infill wells to seek untapped regions of the reservoir. Furthermore, results show that the optimization of perforations delivered better final solutions. Optimization under uncertainty has a significant effect on the maximization of oil recovery and optimum well placement. INTRODUCTION In most brownfields, the amount of recoverable hydrocarbon volume depends mainly on the well design chosen, location of the well and reservoir characteristics. These parameters are crucial in obtaining high oil recoveries in brownfields with prolonged periods of waterflooding. The optimization of well location and design is therefore important for deciding optimal regions in a reservoir to drill high potential wells.
- Overview > Innovation (0.40)
- Research Report > New Finding (0.34)