Hydraulics Optimization for Efficient Hole Cleaning in Deviated and Horizontal Wells
- J.O. Ogunrinde (University of Port Harcourt) | A. Dosunmu (University of Port Harcourt)
- Document ID
- Society of Petroleum Engineers
- Nigeria Annual International Conference and Exhibition, 6-8 August, Lagos, Nigeria
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.3.3 Particle Transportation, 1.6.6 Directional Drilling, 4.1.5 Processing Equipment, 1.12.6 Drilling Data Management and Standards, 4.1.2 Separation and Treating, 1.11.5 Drilling Hydraulics, 1.11 Drilling Fluids and Materials, 1.5.4 Bit hydraulics, 7.4.3 Market analysis /supply and demand forecasting/pricing, 1.4 Drillstring Design, 1.6.3 Drilling Optimisation, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 1.6.1 Drilling Operation Management, 5.4.2 Gas Injection Methods, 4.3.4 Scale, 1.15 Fundamental Research in Drilling, 1.6 Drilling Operations, 3 Production and Well Operations, 1.7.7 Cuttings Transport, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.10 Drilling Equipment
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Efficient cuttings transport and hole cleaning is a very important factor that must be considered during drilling operations. In inclined and horizontal drilling, hole cleaning is a common issue since there is high tendency for formation of cuttings bed in the hole which can lead to several complex problems. The optimization of cuttings transport depends on so many factors like hole angle, cutting size, drill string rotation, drill pipe eccentricity, bit hydraulics etc.
This paper is designed to examine critical factors that affect the efficient cleaning/transport of cuttings and bit hydraulics in inclined wells with a view to understanding how to minimize drilling difficulties thereby reducing non producing time (NPT) during drilling operations.
The developed model ensures proper hole cleaning in the critical hole angle (between 45o and 60o) as well as horizontal wells and determining the optimum flowrate and rate of penetration (ROP) that will ensure successful drilling. The model also helps to save time wasted when we encounter problems of high concentrations of cuttings which causes high Equivalent circulation density (ECD) that can result in lost circulation problem amongst others.
Finally, the developed model is validated using field data and graphs showing how the penetration rate increases as cuttings concentration in the annulus reduces thereby optimizing drilling operations.
The world's energy demand continues to increase, more extended reach wells, ultra deep and highly deviated wells are being drilled to meet this energy demand. However, one of the biggest challenges in highly deviated and extended reach wells is the problem of hole cleaning during drilling. Poor hole cleaning can result to a number of drilling problems including: stuck pipe, possible hole pack-off, excessive ECD, formation break down and cuttings accumulation.
|File Size||281 KB||Number of Pages||16|