Abstract
Improving drilling efficiency is the best way to reduce drilling costs and the choice of the drilling mode is instrumental in doing so. At present, however, a standard approach for the optimization of these processes does not exists yet. Through a comparative statistical analysis of the rock-breaking mechanisms and the characteristics of different drilling methods, this research proposes a set of cues to achieve this objective. Available statistical data are classified by means of a fuzzy cluster analysis according to the anti-drilling characteristic parameters of formation. The results show that different drilling methods rely on their own rock breaking mechanisms and have distinct characteristics. The rotary table drilling method is the most commonly used drilling mode, however, it displays some limitations with regard to deep wells, ultra-deep wells and difficult formations. The combined drilling method has the advantages of both the rotary table drilling and the down-hole power drilling modes. Polycrystalline diamond compact (PDC) drill bits can lead to good results for medium hardness and weakly abrasive formations. Underbalanced drilling for formations with high hardness and strong abrasiveness displays some limitations.
Highlights
With a long period of development, the methods of oil and gas drilling have been basically become mature [1]
New drilling methods such as the downhole power drilling, the composite drilling and the underbalanced drilling can greatly improve the rate of penetration (ROP) and shorten the drilling cycle [10–13]
Compared with the downhole power drilling method, the compound drilling method has the advantages of both rotary table drilling and downhole power drilling, especially in the deep wells and the difficult formations
Summary
With a long period of development, the methods of oil and gas drilling have been basically become mature [1]. A new spatial modeling method is proposed for the 3D formation drill ability field. The conventional rotary drilling method cannot meet the needs of high efficiency and fast drilling. New drilling methods such as the downhole power drilling, the composite drilling and the underbalanced drilling can greatly improve the rate of penetration (ROP) and shorten the drilling cycle [10–13]. These new drilling methods have more limitations during the application. According to the formation characteristics, selecting a fast and economical drilling method can effectively improve the drilling speed and reduce the drilling cost
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