Method for calculating safe hole drift angle of deflecting section of horizontal well

Abstract

The invention discloses a method for calculating the safe hole drift angle of a deflecting section of a horizontal well. The method comprises the following steps that 1, logging information is finelyexplained, and a box and the transverse structure change of the box in the horizontal direction are determined in combination with an earthquake treatment result; 2, parameters needed by calculation of the safe hole drift angle are extracted according to geological and drilling engineering design; 3, by means of the parameters in the step 2, assuming the stratum is horizontal, a well track designmethod is applied to inversely calculating the apparent safe hole drift angle between the top of the box and a certain selected position on the upper portion of the box from the box; 4, according to the change trend of the horizontal well drilling direction structure, the apparent safe hole drift angle is corrected, and the safe hole drift angle in a downhole state is obtained; and 5, the well track design method is applied to obtaining the safe hole drift angle of other levels above the level. According to the method, important parameters are provided for deflecting section well track design,and well track optimal design and safety management under the complicated geological conditions are achieved.

Description

technical field [0001] The invention belongs to the technical field of geosteering while drilling, and relates to a calculation method for an optimal well inclination angle of a deflection section of a horizontal well, and in particular to elements required for geological and engineering design in the horizontal well drilling process and well trajectory control in the actual drilling process. Background technique [0002] A large number of horizontal well drilling practices have shown that the design of horizontal well trajectory depends on accurate geological parameters, and the management of horizontal wells also requires clear data on the safe inclination range. When the upper formation continues to drill within the safe inclination range , from the point of view of trajectory control, it is safe and effective for the following landing control. However, these parameters are often difficult to obtain accurately. [0003] Traditional horizontal well trajectory design metho...

AI Technical Summary

Problems solved by technology

These methods have certain guidance for actual drilling, but obviously lack operability, especially when the actual drilling trajectory deviates from the design, it is difficult to make an accurate judgment on whether there is risk or the level of risk, which is not conducive to the next step The decision-making is not conducive to the actual operation of the operation engineer

The main reason for this deficiency is the lack of information on safe well inclinations derived from reservoir location and reservoir conditions, resulting in obvious deficiencies in the design and implementation process

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