Published February 2011

Definition of pressing force arising in a consequence of pressure difference and its liquidation

J. S. Akhundov

G. V. Jabbarova

Sh. Kh. Bakirov

By analyzing of lithological features and stratigraphy of the layers in the geological section of Absheron and Baku archipelagos it is getting clear that porous productive horizons form 10 - 15 per cent of general section. However, most crashes arise while drilling productive horizons. Despite positive changes in the well system, considered in the project of drilling wells, during the drilling of some porous productive layers together plug of the boring pipe arises. Separating drilling of the porous layers which have appropriate layer pressures by launching of the extra productive pipe causes to diminishing of the well diameter, increase of the metal capacity and increase of the cost price of the well. Thus, while joint drilling of horizons having active porosity centralized are used for reducing contact area between well muzzle and boring tool. Existence of grottos in the well muzzle provides reducing of contact area during the use of centralizers. Thus, the boring tool associated with the layers consisting of sandy and cracked limestone plugs at the result of the unnecessary pressure formed by the difference of layer and hydrostatistic pressure. As the number of porous layers and their heights rise plugging force increases. At the result a large force is needed for the movement of the boring tool up and down.