Real-Time Optimization of Drilling Parameters
- Karen Bybee (JPT Assistant Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- February 2011
- Document Type
- Journal Paper
- 48 - 49
- 2011. Society of Petroleum Engineers
- 3 in the last 30 days
- 515 since 2007
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This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 129126, "Real Time Optimization of Drilling Parameters During Drilling Operations," by Tuna Eren, SPE, Eni E&P, and M. Evren Ozbayoglu, SPE (currently with the University of Tulsa), Middle East Technical University, originally prepared for the 2010 SPE Oil and Gas India Conference and Exhibition, Mumbai, 20-22 January. The paper has not been peer reviewed.
The objective of real-time optimization of drilling parameters is to optimize weight on bit (WOB) and bit rotational speed to achieve maximum drilling rate and to minimize drilling cost. An extensive literature survey of drilling-optimization research was conducted for the study described in the full-length paper. The general equation for rate of penetration (ROP) was optimized using actual field data.
The objective of optimizing drilling parameters in real time is to arrive at a methodology that considers past drilling data and predicts drilling trends to advise of optimum drilling parameters to save drilling costs and reduce the probability of encountering problems. To achieve effective optimization, an extensive literature survey was conducted and the results of previous researchers were considered in developing a drilling-optimization methodology in a real-time environment. The linear drilling-ROP model introduced in 1974 that is based on multiple regression analysis was used in real time to:
- Achieve coefficients of multiple regression specific to the formation.
- Determine an ROP-vs.-depth prediction as a function of certain drilling parameters.
- Determine optimum drilling parameters specific to the formation being drilled.
The following assumptions are considered to be satisfied so that the equations given in this study function properly:
- Bottomhole cleaning is achieved effectively.
- The bit and bottomhole-assembly combination in use is one that is selected properly for the formation being drilled.
- The formation interval being drilled is considered to be homogeneous.
- The rig and auxiliary equipment are functioning efficiently.
Data from three directional offshore wells in the Mediterranean area were used to test the methodology.
Numerous detailed research studies have been performed for optimization of drilling activities with the objective of maximizing footage drilled and minimizing drilling costs. Drilling optimization can be achieved by preselecting the magnitudes of the controllable drilling parameters.
Most of the early studies described in the literature have foreseen a static drilling-optimization process. In the past, drilling parameters were required to be investigated off site because of the lack of ability to transfer data in real time. Recent studies have performed drilling optimization in real time; however among the investigated references, there is no work with statistical correlations in a real-time environment.
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