Hydraulic Optimization of Foam Drilling For Maximum Drilling Rate in Vertical Wells
- Ergun Kuru (U. of Alberta) | Osunde M. Okunsebor (U. of Alberta) | Yibing Li (U. of Alberta)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2005
- Document Type
- Journal Paper
- 258 - 267
- 2005. Society of Petroleum Engineers
- 4.1.6 Compressors, Engines and Turbines, 1.8 Formation Damage, 1.6.6 Directional Drilling, 1.11.5 Drilling Hydraulics, 1.7.5 Well Control, 1.7.2 Managed Pressure Drilling, 1.7.1 Underbalanced Drilling, 1.6.3 Drilling Optimisation, 1.6 Drilling Operations, 4.3.4 Scale, 1.10 Drilling Equipment, 1.11 Drilling Fluids and Materials, 5.2 Reservoir Fluid Dynamics, 1.5.4 Bit hydraulics, 4.2 Pipelines, Flowlines and Risers, 5.4.2 Gas Injection Methods, 1.7.7 Cuttings Transport
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A transient-mechanistic model of cuttings transport with foam has beenrecently developed and solved numerically. In this study, the new model hasbeen used to revisit the classical theory of hydraulic optimization (i.e.,maximum bit-hydraulic-horsepower/jet-impact-force criteria).
A new methodology has been suggested to determine the optimumgas-/liquid-injection rates for maximizing drilling rates when drilling withfoam in vertical wells while keeping the bottomhole pressure at minimum.
The new method can be easily used in the field to determine the bestcombination of gas-/liquid-injection rates and total-bit flow area (i.e.,jet-nozzle sizes), such that the maximum drilling rate isachieved.
Foam is often used as a circulating fluid in underbalanced drillingoperations because of its high viscosity and variable density. Applications offoam as a drilling fluid in many drilling operations, and the results fromvarious field cases, are well documented.1-6
Drilling hydraulics has long been recognized as one of the most importantconsiderations for maximizing drilling efficiency and minimizing drillingcost.7-10 The concept of hydraulics optimization fordrilling with incompressible fluids has been well investigated.11-17
Optimization of drilling hydraulics requires calculation of frictionalpressure losses in the system and the minimum fluid velocity to carry thecuttings in the annulus. Finding satisfactory answers for both of theseproblems has been a challenge for engineers, even for incompressible drillingfluids.
The hydraulic-optimization problem becomes more complicated when drillingwith foam because of the compressible nature of the foam. Determining theoptimum backpressure and
gas-/liquid-injection rates for effective cuttings transport, whileachieving the maximum drilling rate, are some of the major questions needing tobe answered.
In this paper, a new methodology is presented for determining the optimumcombination of backpressure, gas/liquid ratio, and total flow area to maximizethe drilling rate when drilling with foam.
|File Size||254 KB||Number of Pages||10|
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