Experimental study of the penetration rate impact and drilling cutting properties on the hole cleaning index (HCI) in directional drilling wells

Document Type : Original Article

Authors

1 Amirkabir University

2 Amirkabir university

3 Tarbiat Modarres University

Abstract

Summary
Due to the importance of the rate of penetration and hole cleaning in directional wells to reduce the costs, after detection of critical inclination, the relationship between the effective parameters has been studied in an experimental flow loop. The cuttings, used in the tests, have had a specific size distribution in three types of sand, silica and limestone. The results illustrate that the hole cleaning index (HCI) of powder types in comparison to non-powder types is higher. The effects of bit and pipe rotation on the HCI have been studied in this research work. In this regard, there is an optimum point of the HCI for each of these effects. The end point and the length of the cutting bed have the same behavior. The larger density and lower size cuttings, compared to the lower density and larger size cuttings have higher HCI. In addition, the effect of the shape and size distribution of cuttings on the HCI seems to be remarkable.
 Introduction
Reparability, durability, cost, drill ability and many other parameters are important in using the bits. Based on these parameters and the softness or hardness of the formation, a bit is selected. The cuttings that are generated in directional drilling, based on the bit type and formation type, have different sizes, shapes, densities and volumes. In this paper, the hydraulic effect after releasing the wait on bit is discussed. Hole cleaning is a key parameter in extended reach drilling, especially in critical inclination periods, where the probability of the different sticking types is increased. The critical inclination is the angle that has the worst hole cleaning. In this research, by applying discrete angles in laboratory tests, one specific angle is determined as the critical point, and in this regard, the effect of size, shape, density and volume of cuttings are studied.

Keywords

References

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Journal of Petroleum Geomechanics
Volume 1, Issue 1
August 2017
Pages 15-28

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