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DISCUSSION ON THE RULE OF WELL DEVIATION AND STRATIGRAPHIC DIP IN AIR DRILLING

Yong Cheng

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Abstract

Using air drilling technique can effectively control formation damage, leak protection and improve the rate of penetration. But well deviation of air drilling is a problem in some place where drilling has no problem with mud. In this paper, a series of high non-linear elastoplasticity finite element model were established to simulate well hole of air drilling and mud drilling under different stratigraphic dip. The stress distribution, rock-breaking trend and the changement relationship of deviation and the stratigraphic dip of rock in well bore were analyzed and discussed in air drilling, and the well deviation laws of air drilling were obtained. Meantime, compared with mud drilling, well deviation in air drilling is easier than do in mud drilling.

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What this paper is about

Using air drilling technique can effectively control formation damage, leak protection and improve the rate of penetration. But well deviation of air drilling is a problem in some place where drilling has no problem with mud. In this paper, a series of high non-linear elastoplasticity finite element model were established to simulate well hole of air drilling and mud drilling under different stratigraphic dip. The stress distribution, rock-breaking trend and the changement relationship of deviation and the stratigraphic dip of rock in well bore were analyzed and discussed in air drilling, and the well deviation laws of air drilling were obtained. Meantime, compared with mud drilling, well deviation in air drilling is easier than do in mud drilling.

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Available abstract

Using air drilling technique can effectively control formation damage, leak protection and improve the rate of penetration. But well deviation of air drilling is a problem in some place where drilling has no problem with mud. In this paper, a series of high non-linear elastoplasticity finite element model were established to simulate well hole of air drilling and mud drilling under different stratigraphic dip. The stress distribution, rock-breaking trend and the changement relationship of deviation and the stratigraphic dip of rock in well bore were analyzed and discussed in air drilling, and the well deviation laws of air drilling were obtained. Meantime, compared with mud drilling, well deviation in air drilling is easier than do in mud drilling.

Key concepts: Drilling, Geology, Petroleum engineering, Rate of penetration, Penetration rate, Drilling fluid, Geotechnical engineering, Mining engineering

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