A Technique for Accurate Bit Programming and Drilling Performance Optimization
- E.L. Simmons (Chevron Geosciences Co.)
- Document ID
- Society of Petroleum Engineers
- SPE/IADC Drilling Conference, 9-12 February, Dallas, Texas
- Publication Date
- Document Type
- Conference Paper
- 1986. IADC/SPE Drilling Conference
- 1.7.7 Cuttings Transport, 1.6 Drilling Operations, 1.1 Well Planning, 2.4.3 Sand/Solids Control, 1.6.3 Drilling Optimisation, 1.5.4 Bit hydraulics, 1.2.2 Drilling Optimisation, 1.11 Drilling Fluids and Materials, 1.11.4 Solids Control, 1.8 Formation Damage
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The dilemma of improving drilling rate and efficiency through the use of various optimization techniques has been the center of research and debate for many years. Both the well planner and the drilling supervisor in the field are acutely aware of the positive affects of optimized drilling on wellbore stability, the reduction in overall drilling costs, and the ultimate usefulness or production of the well.
The purpose of this paper is to illustrate a technique for synergistically coupling several optimization parameters, namely optimum hydraulics, weight on the bit and bit rotation, in order to achieve a higher degree of drilling efficiency. Formation drillability and bit type selection are brought out and integrated with a generally accepted drilling rate equation.
The result, is a technique that provides the engineer involved in well planning, with a reasonable procedure for analyzing previous offset operations and subsequently predicting, with reasonable reliability, those parameters and their magnitudes required for drilling optimization out the well he is planning. Also, by employing a modification this technique during drilling operations, the supervisor on location can constantly be "fine tuning" certain drilling parameters in order to achieve optimum drilling parameters in order to achieve optimum drilling performance. performance. Fundamentally the technique involves generally accepted procedures which are merely coupled to form a synergistic system. It is simple enough to be employing in the field and yet can be thorough and detailed enough to provide the engineer in the office with the tools to perform accurate and timely well planning, based upon reliable offset well data.
The approach to well planning and drilling operations, when involved in infield or development projects, has typically centered around doing the job more efficiently, or with more cost effectiveness, than had previously been accomplished. Recognizing and understanding those factors which effect penetration rate and or drilling efficiency is obviously of prime importance. A partial list of some of these factors is:
Circulating System Hydraulics
Weight on the Bit
Bit Revolutions Per Minute
. Drilling fluid Type and Properties
This list is certainly not exhaustive, however it does contain those parameters which are usually considered to be of greatest importance.
Observation and research has indicated, that improving on, or optimizing any one of these parameters will generally improve drilling parameters will generally improve drilling efficiency. Further investigation and application of state-of-the-art technology however, has indicated that most factors affecting penetration rate do not respond independently but rather function synergistically and are interdependent upon one and other for overall drilling optimization. This would seem to indicate that true optimization can be accomplished only by coupling two or more interdependent parameters and adjusting the magnitude of these parameters accordingly.
|File Size||1 MB||Number of Pages||15|