RBI: Detecting characteristics of rock failure while drilling
- Univ. of Oklahoma, Norman, OK (United States)
The drilling for hydrocarbon reserves can be made less costly be equipping the drilling rig with instrumentation that can instantaneously assess the state of the drilling process, both at the rig floor. and downhole. Recent and continuing improvements in micro electronic hardware, microcomputers, microcomputers and digital signal processors now make it cost effective to automate information gathering while drilling. The impact that processed real time data could have on the success of a drilling operation is significant. The evaluation in real time of, for example, bit ware, bit location and bit trajectory could conceivably eliminate the need for unproductive tripping for surveys and unscheduled maintenance. Downhole signal conditioning is already employed in MWD systems. What is proposed here is the utilization of smart processors downhole to distill all measurable conditions while drilling. An intelligent micro processor located near the bit could do more than store the value of measured variables; by applying rigorous signal processing methods (e.g. Kalman filtering); it could provide predictions of impending changes in drilling parameters. This brief paper examines the issues that are raised by the possibilities of sensing in situ rock conditions while drilling. The advantage that might be accrued from the real time measurement estimation of rock properties are discussed in the main body of this paper. In order to demonstrate the concepts, the paper describes the result of a laboratory experiment that utilized real time signature analysis of PDC bit/rock interaction. It is shown that this technique may provide a means of detecting changes in rock strength, type, isotropy and bedding characteristics while drilling.
- OSTI ID:
- 93050
- Report Number(s):
- CONF-940113-; ISBN 0-7918-1182-4; TRN: IM9537%%93
- Resource Relation:
- Conference: 17. American Society of Mechanical Engineers (ASME) energy-sources technology conference and exhibition (ETCE), New Orleans, LA (United States), 23-26 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Drilling technology -- 1994. PD-Volume 56; Vizniak, J.P. [ed.] [Maurer Engineering, Inc., Houston, TX (United States)]; PB: 280 p.
- Country of Publication:
- United States
- Language:
- English
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