Comprehensive approach to torque and lost circulation problems in geothermal wells in terms of drilling fluid

Download

12625732.pdf

Date

2020-7

Author

Sönmez, Ahmet

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

318
views

355
downloads

Drilling in a lost circulation zone has long been a challenge in geothermal wells due to its strong potential for high torque and wellbore instability. Excessive torque and friction values cause overpull, pipe stuck and severe problems ending up with losing the well in some cases. High temperature-high pressure (HTHP) drilling fluids design; which minimize loss rates and friction values, is critical for the success of these challenging drilling practices. Known fact is that, oil/synthetic based drilling fluids have the best lubricity performance. However, application of these drilling fluid systems is limited because of high cost and environmental constraints. At this point, water-based drilling fluid compositions with high lubricity performance, HTHP resistance and high loss zone plugging performance, are investigated. In this study, HTHP drilling fluid system; frequently used in Turkey and worldwide, is selected for the experiments. Several chemical commercial lubricants are added in this fluid system to find the compositions for the highest lubricity performance closest to oil/synthetic based drilling fluid systems. Also, considering the formation characteristics and drilling limitations; best fluid compositions are formulated to plug the potential seepage and partial loss zones and reduce the differential-sticking tendency by using proper lost circulation materials. Results reveal that lubricity and pore plugging characteristics of the selected compositions are highly innovative and noteworthy to be used in field applications for geothermal drilling industry.

Subject Keywords

Drilling Fluid, Geothermal, Lost Circulation, Lubricity, HTHP, Torque

URI

https://hdl.handle.net/11511/69301

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Comprehensive approach to torque and lost circulation problems in geothermal wells in terms of drilling fluid Sönmez, Ahmet; Kök, Mustafa Verşan; Bal, Berk; Bagatır, Gökhan; Gücüyener, I.Hakkı (2021-09-01) Drilling in a lost circulation zone has long been a challenge in geothermal wells due to its strong potential for high torque and wellbore instability. Particularly in deviated, extended reach and horizontal wells, frictional forces between drill string and wellbore or casing may be high enough to interfere with running the pipe in and out of the hole. These forces may also increase the torque and the stress on drill string which may end up with severe problems like stuck pipe and lost in hole. High-tempera...
Application of artificial neural networks to predict the downhole inclination in directionally drilled geothermal wells Burak, Tunç; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2018) Drilling directionally through naturally fractured geothermal reservoirs is a challenging task due to unexpected changes in inclination and azimuth of the well axis, which causes inefficient weight on bit transfer, decrease in penetration rate, increasing the risk of stuck pipe and problems in while running casings. To predict the sudden changes in inclination while drilling, a back propagation, feed forwarded multi layered artificial neural network (ANN) model, which uses drilling data collected from 12 J-...
Numerical modeling of counter-current spontaneous imbibition during underbalanced drilling Naseri, Masoud; Sınayuç, Çağlar (2012-09-10) Mud solid and filtrate invasion are the most common causes of formation damage during overbalanced drilling (OBD), which is a method of drilling in which the wellbore pressure remains greater than formation pressure. During the past ten years, underbalanced drilling operations (UBD), which can be defined as a drilling method in which the wellbore pressure is less than formation pressure, has been growing due to their applications such as prevention of lost circulation, reduction of filtration lost in natura...
Economical impact of a dual gradient drilling system Peker, Merter; Parlaktuna, Mahmut; Department of Petroleum and Natural Gas Engineering (2012) Dual Gradient Drilling (DGD) system is a promising technology that was developed to overcome the deep water drilling problems occurred due to narrow operating window between pore pressure and fracture pressure. In conventional drilling practice, single mud weight exists from drilling unit to TVD (True Vertical Depth) which creates big hydrostatic pressure in bottom hole ,moreover, minor changes in mud weight results a big pressure changes proportional to the length of hydrostatic column increase with water ...
Trajectory estimation in directional drilling using bottom hole assembly(bha) analysis Doğay, Serkan; Kök, Mustafa Verşan; Department of Petroleum and Natural Gas Engineering (2007) The aim of this study is to combine the basic concepts of mechanics on drill string which are related to directional drilling, thus finding a less complicated and more economical way for drilling directional wells. Slick BHA, which has no stabilizers attached and single stabilizer BHA are analyzed through previously derived formulas gathered from the literature that are rearranged for this study. An actual directional well is redrilled theoretically with a slick BHA and a computer program is assembled for c...

Citation Formats

A. Sönmez, “Comprehensive approach to torque and lost circulation problems in geothermal wells in terms of drilling fluid,” Ph.D. - Doctoral Program, Middle East Technical University, 2020.