An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article.

The Self-Organizing Map

Hydrodynamic and hydromagnetic stability

CFD–DEM approach to investigate the effect of drill pipe rotation on cuttings transport behavior

Real time prediction of drilling fluid rheological properties using Artificial Neural Networks visible mathematical model (white box)

Getting the books fundamentals of drilling engineering now is not type of challenging means. You could not deserted going taking into account ebook stock or library or borrowing from your contacts to log on them. This is an very easy means to specifically acquire lead by on-line. This online statement fundamentals of drilling engineering can be one of the options to accompany you subsequently having further time.

Fundamentals of drilling engineering

Lost circulation is one of the most persistent and costly drilling problems that drilling engineers have been struggling with for decades. The main reason why some of the remedial procedures are not working as planned is the lack of information, such as the location of the loss zone. The pinpointing of the zone of loss will allow the treatment to be applied directly to the point of loss rather than to the entire open hole.This paper presents an approach to predict the location of loss zone from the transient mud circulation temperature profile altered by the mud loss. A numerical model in estimating the transient mud circulating temperature profile during a lost circulation event is developed. The temperature profile in both the flow conduits (drillpipe and annulus) are modeled using mass and energy balance. The flow rate of drilling mud decreases in the annulus above the loss zone as part of the fluids lost into the fractures, which in turn alters the heat transfer between the drillpipe, annulus, and formation. The wellbore is divided into two multiple sections, which account for single multiple loss circulation zones. Rigorous heat transfer in the formation is included. Case studies are performed and numerical solution results are presented and analyzed. According to the results, temperature alterations induced by mud loss include: 1) Declines in both bottom-hole temperature (BHT) and mud return temperature over time, and 2) Discontinuity in the first order derivative of annulus temperature with respect to depth at the location of loss zone; meanwhile, the temperature alterations are mainly controlled by the mud loss rate and location of loss. By matching the simulated results with the distributed temperature measurements at different times, the depth of the loss zone can be identified. This piece of information is important for the spotting of LCM (lost circulation material) pills, the optimization of overbalance squeezing pressure, as well as the consideration of setting the cement plug or additional casing.Copyright © 2014 by ASME

Modeling Transient Circulating Mud Temperature in the Event of Lost Circulation and its Application in Locating Loss Zones

Experimental Study of Reservoir Stress Path and Hysteresis during Depletion and Injection under Different Deformational Conditions

Improvement of Hole Cleaning Through Fiber Sweeps

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

This paper discusses a series of experiments performed on Carthage Marble Limestone rock samples in a high pressure single PDC cutter testing facility. The tests were performed at 450 psi confining pressure conditions and four different cutters were used. Two different cutter diameter sizes of 13 mm and 16 mm, each with two different chamfer sizes of 0.010 inch and 0.016 inch were tested. Effect of the cutter geometry on the MSE of the cutting action and grain size distribution are discussed in this paper.The experimental results show that, in the tested range, the difference between the MSE when the two different cutter sizes are considered is insignificant. On the other hand, the results show that a change in the chamfer length from 0.010 inch to 0.016 inch can significantly increase the required MSE (as much as 20%). The cuttings produced at each test were gathered and tested in a particle size testing facility and the results were analyzed to determine which drilling parameters can be best correlated to the particle size distribution of the cuttings. The results show that the minimum particle size of the cuttings has a relatively strong dependency on the MSE of each test. The minimum particle size decreases as the MSE of the cutting increases and this is closely related to the extra energy required to regrind and crush the rock as a consequence of decreased drilling efficiency. In fact, the MSE can be estimated by the rock fracture surface energy and the grain size distribution.Copyright © 2014 by ASME

Evren Ozbayoglu

Papers

Modeling Transient Circulating Mud Temperature in the Event of Lost Circulation and its Application in Locating Loss Zones

Experimental Study of Reservoir Stress Path and Hysteresis during Depletion and Injection under Different Deformational Conditions

Improvement of Hole Cleaning Through Fiber Sweeps

Experimental investigation of fracture-based wellbore strengthening using a large-scale true triaxial cell

Relation Between the Mechanical Specific Energy, Cuttings Morphology, and PDC Cutter Geometry