April 29, 2020


Description

Different types of forces NOT accounted for by the wave equation are 1) mechanical friction, 2) piston force acting on the polished rod due to tubing back pressure and 3) true vertical rod weight. Mechanical friction will be discussed from 1) over-tight stuffing box, 2) down hole sticking due to a severe dogleg in the wellbore profile and 3) friction from paraffin along a section of the rod string. The application of these external mechanical forces acting on the rod string impacts measured surface loads, down hole stroke length and plunger velocity, plus the calculated rod loading at the pump or other locations along the rod string.
Damping coefficients are used to subtract out fluid damping as a function of velocity along the rod string using the wave equation. Unaccounted for mechanical friction cannot be modeled by adjusting the damping factors in the wave equation. Mechanical friction impacts both the shape of the pump card and the measured surface dynamometer card loads versus position and, as friction on the rods goes up then the surface load range also changes. Field measured dynamometer data will be used to show examples of these different types of forces NOT accounted for by the wave equation.
Dog Leg Severity (DLS) had been used for many decades as recommendations to drill oil and gas wells and to provide "trouble free" operating conditions. Many of these recommendations were historically based on vertical, shallow (<5000 ft.) deep wells. But as wells continued to be drilled deeper, the recommendations were still applied. With the current drilling and operating practices of deviated and/or horizontal wells, these recommendations may no longer be applicable. Additionally, the deviation measurement interval (degrees/100 ft.) also may no longer be accurate when trying to match downhole problems using existing rod string design software. Furthermore, as wells have become deeper and many now also exclusively are drilled as deviated/ horizontal, side loading (SL) may be a more appropriate condition to be used to determine problems. This presentation will provide new recommendations for drilling wells that should provide better, longer term, less problematic operating wells.
Technical papers presented at the SWPSC on these topics will be provided in PDF format to interested participants of the Lunch and Learn.


Featured Speakers

Speaker: O. L. Rowlan
Speaker O. L. Rowlan
L. Rowlan education includes a Bachelor and Masters of Science degree in Civil Engineering graduating in 1976 from Oklahoma State University in Stillwater Oklahoma. Mr. Rowlan was the recipient of the 2000 J.C. Slonneger Award bestowed by the SW Petroleum Short Course Association, Inc; the recipient of the 2010 SPE …

L. Rowlan education includes a Bachelor and Masters of Science degree in Civil Engineering graduating in 1976 from Oklahoma State University in Stillwater Oklahoma. Mr. Rowlan was the recipient of the 2000 J.C. Slonneger Award bestowed by the SW Petroleum Short Course Association, Inc; the recipient of the 2010 SPE Distinguished Production Operations Award; and the 2011 Crawford Service Award from the SW Petroleum Short Course Association.  During the 39 years of experience in the Oil & Gas industry Mr. Rowlan has authored more than eighty research works/papers for the Southwestern Petroleum Short Course, the Solution Mining Research Institute, the Artificial Lift Research and Development Counsel, the Russian Oil & Gas Technologies Magazine, the Canadian Petroleum Society and the Society of Petroleum Engineers. He co-authored a book for gas well production optimization “Gas Well Deliquification”. He also holds a US Patent # 6,634,426 on Plunger Lift Analysis.


 


Beginning in September 2019 Mr. Rowlan retired from full time employment and now works as a consultant.  Prior to retiring Mr. Rowlan held the position of Vice-president of Engineering for Echometer Company in Wichita Falls, Texas. Prior to August 2000 he held the position of Artificial Lift Consultant for Amerada Hess Corporation in Houston, Texas. His primary interest is to advance the technology of using the Echometer Portable Well Analyzer to analyze and optimize the operation of all artificial lift production systems.  Since 2009 his Advanced Dynamometer Analysis on-line training class has been available on http://www.echometer.com">www.echometer.com webpage. He provides training and consultation in performing well analysis to increase oil and gas production and reduce operating cost.  He has given hundreds of seminars and talks on the efficient operation, optimization, and troubleshooting of oil and gas wells. 


 

Full Description



Organizer

Romina Myrtaj


Date and Time

Wed, April 29, 2020

noon - 1 p.m.
(GMT-0500) US/Central

Event has ended

Location

At your computer