Designing the trajectory of a spatially distorted well
Designing the trajectory of a spatially distorted well with a large diameter hole in the upper part
Natural spatial distortion is due to the non-conformity of the type of BHA to geological and technical conditions of drilling for a certain interval, as well as mistakes in conducting of geological exploration. The proposed method, which provides the maximum use of natural distortion and the use of orientated BHA of the bottom of the drill column. The main idea of this method is that the design of the well trajectory is in the direction from the center of the target area to the wellhead. The main areas from which the trajectory of a spatially distorted well with a section of large diameter in the upper intervals is described. The input data necessary for designing the profile is given. The method of calculating the drilling plot with the help of a non-oriented BHA, which consists of several cyclic repetitive operations, is described, with each subsequent interval of the wellbore interval being designed taking into account the change of the inclination and azimuth angles in the previous interval. The review of technical means for drilling the inclinations section is made using oriented BHA. In rotor drilling, the technical means and technology of oriented drilling are quite complex, therefore, dogleg with mud motors are more often used. As a result of calculating the trajectory of the well with different transition points between oriented and non-oriented BHA, on the axis parallel to the azimuth direction, an array of transition points from two-axis to single-axis BHA is formed. Based on the developed method, the authors created software that allows automating the process of designing the well trajectory, while taking into account the change of geology, technical parameters of wells construction and technological parameters of drilling. Using the proposed software, the design of a well trajectory was carried out with an attachment to certain geological drilling parameters.
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