The intentional diversion of a well, comprising many diverse factors which must be taken into account individually. A careful planning is therefore the key to minimize the cost of directional drilling, since proper selection of tools and methods, may result in greater operating efficiency and better economic results.
The objective (zone that the well must penetrate to a given depth), it must be clearly defined. Its shape and size depend usually geological characteristics and location of the producing areas. In the case of a developing field, the drainage radius must also be taken into account. On the other hand, garcinia should not be too small because this will result in a substantial increase in drilling cost.Studies about, shows that the most economical ray objective is given by R = 1 / 12D, where R = target radius and D = lateral displacement.
An analysis of the subsurface must also be made. All geological information subsoil should be taken into consideration.The drilling rig, if possible, should be positioned to take advantage of all the natural tendencies of deviation, which has formations. Knowing that the drill string has the natural tendency of “turning” to the right, i.e., drilling in a curve must design the directional well, so that there is a tolerance of a few degrees to the right, or left of the imaginary horizontal line connecting the lease on the surface, the goal.
Try to go against the natural tendency of the drill, only it brings as a consequence longer drilling and yield less than expected. problems about information found in neighboring wells, such as dog legs, key seats, tortuosity,best pixel gun 3d hack etc. They are also carefully analyzed in the planning of a directional well. coatings and drills programs determine the diameters of the tools used in directional drilling, such as OD of nonmagnetic commands, bent subs, downhole, engines, etc. Although the geology of the field should be considered, it is good practice to lower the surface coating after the build-up and the intermediate coating after the drop-off. It should be borne in mind that in small diameter wells, formations exert a more pronounced effect on steering control; This is due to the fact that the columns of smaller diameter are more flexible, or more susceptible to working imposed by the formations.
As a result, the wells have larger diameters are easier to control, which is more stable with respect to the direction. Finally, in deep and inclined wells, it is common to use rubber pads in the column drill pipes in order to avoid their own wear and the casing string. Control of mud is also very important, especially to reduce drag in directional wells.Friction reducing additives are often used, and both the density and the viscosity of the fluid must be kept in strict control at all times.