Stick Slip Mitigation Plan to Improve Drilling
- Ahmad Zakuan (Petronas Carigali) | Azreen Junaida Abd Aziz (Omni Oil Technologies) | Bramanta Subroto (Schlumberger) | Heru Hermawan (Petronas Carigali Sdn Bhd) | Abdul Fatak Othman (Halliburton Energy Services Group) | Abdul Halim Bin Shariff | Seyri Anuwa Jahari (Petronas Carigali Sdn Bhd)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil and Gas Conference and Exhibition, 20-22 September, Jakarta, Indonesia
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 1.5 Drill Bits, 1.6 Drilling Operations, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.1 Drilling Operation Management, 1.11 Drilling Fluids and Materials, 1.10 Drilling Equipment
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Drilling performance becomes inefficient by the presence of vibrational effect which is stick and slip. This situation is a source of failure which reduce penetration rate, increase operating time, and contribute to increase drilling operating costs.This is due to the surface alternating between sticking to and sliding over each other, with a corresponding change in the force of friction. Only if kinetic friction is bigger enough to encounter this static friction, it can cause a sudden jump in the velocity of the movement, condition characterized by fluctuations in the rotational speed of BHA.The main objective is to come out with a solution in reducing stick and slip.First, the problem is encountered by means of the alignment of different drilling parameters, such as rotary speed, drilling torque and weight on bit. This conventional control technique required expertise from driller. Second, by introducing a roller reamer, the more effective control methodology.Roller cutters from the roller reamer rotate around the wall and it is able to provide low torque point of stabilization. It transforms the interaction between borehole and contact points by introducing a low-friction bearing between BHA and borehole wall.As a result, implementation of roller reamer shows the constant transmission of rotational energy, thus able to improve the weight to the bit. Two offset wells have been selected for this case study, with well #1 exercising conventional method while well #2 makes use of roller reamer. Stick slip effect reduces from 180% srpm to 30% srpm. Furthermore, it is able to save 40% of drilling time on that particular section.
This paper focuses on the practical solution by implementing roller reamer to mitigate stick slip effect base on actual field scenario. A comparisons and conceptual models are provided as well as the illustration of its configuration.
Different types of vibrations can take place while drilling, namely lateral, vertical and torsional vibrations. This paper will focus on torsional vibration and more precisely on their most violent extend, the so called stick and slip.
Stick and slip as indicated by its name, is characterized by a period succession of sticking phase where the BHA is stops for a finite time interval and slipping phase where its angular velocity O increases up to two or three times the imposed velocity O?.
This oscillation can last for several minutes and sometimes could go longer than that. However, some study found that the occurrence of stick and slip corresponds to about 50% of the on-bottom drilling (Henneuse, 1992, Elf-Aquitaine).
Its have been observed to occur mostly under large weight on bit and low angular velocity (Brett, 1992).Thus , an increase of the applied weight on bit and low angular velocity which normally we called it RPM can trigger instabilities leading eventually to stick and slip. The decrease of the applied weight on bit or an increase of imposed velocity O? can stop stick and and slip.Manipulating different drilling parameters as increasing the rotary speed, decreasing the weight on bit (WOB) or modifiying the drilling mud characteristics as shown in the field to suppress stick and slip motion (P.Sananikone etc al,1993).
In today's drilling community, stick and slip phenomenon well known as associated with drill bit. However, it is not a phenomenan that is strictly associated with the drill bit. The condition and tortuosity of the wellbore, the type of formations being drilled and the lubricity of the drilling have a significant influence on stick and slip as well. There are a few control methodologies in order to compensate drilling stick and slip either classic control techniques or sophiscated techniques. While the roller reamer always seen to mitigate tight hole condition, this study will show how the roller reamer could become an alternative approached to decouple stick and slip problem.
Stick and slip reduce by using Roller Reamer
Today's challenging drilling environment demands superior performance of tools in BHA especially for 3D, high angle and extended reach wells. Common drilling problems could be minimized by running correct tools downhole in combination with ideal drilling parameters and best drilling practises.
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