Understanding and Managing Bottom Hole Circulating Temperature Behavior in Horizontal HT Wells - A Case Study Based on Haynesville Horizontal Wells
- Donald Keith Trichel (Baker Hughes Inc) | John A. Fabian (INTEQ)
- Document ID
- Society of Petroleum Engineers
- SPE/IADC Drilling Conference and Exhibition, 1-3 March, Amsterdam, The Netherlands
- Publication Date
- Document Type
- Conference Paper
- 2011. SPE/IADC Drilling Conference and Exhibition
- 1.4.1 BHA Design, 4.3.4 Scale, 1.6 Drilling Operations, 1.5.4 Bit hydraulics, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 2 Well Completion, 5.9.2 Geothermal Resources, 1.12.6 Drilling Data Management and Standards, 1.5.1 Bit Design, 1.7.7 Cuttings Transport, 5.8.2 Shale Gas, 1.2.2 Geomechanics, 1.5 Drill Bits, 1.10 Drilling Equipment, 1.6.1 Drilling Operation Management, 1.12.1 Measurement While Drilling, 1.11 Drilling Fluids and Materials, 5.1.10 Reservoir Geomechanics, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.12.2 Logging While Drilling
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While HT wells have always presented drilling challenges, the recent activity increase in the Haynesville shale located across the border between Texas and Louisiana presents a unique and extreme environment for drilling equipment. Not only is there a high frequency of temperature related MWD/LWD failures, the profile and architecture of Haynesville wells has provided an opportunity to study and better understand the thermal behavior of horizontal HT wells in general. Through improved understanding, well specific operational guidelines and planning considerations can be implemented to ultimately reduce the
risk of downhole temperature related failures.
This paper discusses a Haynesville horizontal well case study where temperature simulations were compared and calibrated to actual downhole temperature measurements taken while drilling. After calibration of the model was established, a series of simulations were conducted to investigate the sensitivity of bottom hole circulating temperature to choices of drilling systems, fluids systems, mud cooling systems and well design.
The simulation results indicate:
1) The bottom hole circulating temperature profiles of HT horizontal wells are significantly different than those of vertical wells and can even exceed the bottom hole static temperature.
2) The simple every day choices made with regards to the drilling program including fluids selection, hole size, bottom hole assembly type, bit hydraulics, and flowrate all influence bottom hole circulating temperature and can either increase it or decrease it.
3) Optimization in the traditional sense (focused on ROP) does not apply and can result in even higher bottom hole circulating temperatures. The correct procedures are often counter intuitive.
This paper will detail the above mentioned effects on bottom hole circulating temperature and will present optimization guidelines and planning considerations for managing circulating temperatures. At the time of this writing, the implementation of these guidelines and procedures discussed in this paper is just beginning. The overall trends for MWD/LWD performance for the Haynesville, while improving over time still indicate significant room for improvement in planning and operating practices (Appendix - Figure A1). Guidelines and planning considerations, and operating practices for horizontal Haynesville wells are presented along with the reasoning behind them.
Shale plays in the United States have increased in prominence over the past few years as advances in drilling and completion technology have made the considerable gas reserves held in shale basins increasingly accessible. As a result, the Haynesville shale basin is one of a number of shale basins that are now being exploited. The Haynesville covers approximately 9,000 square miles, straddling the border between north Texas and Louisiana. It is projected that the Haynesville basin contains in the order of 250 Tcf of technically recoverable gas, which makes it one of the largest gas plays in the US.
|File Size||978 KB||Number of Pages||20|