Universal method for forecasting in-target situation of guide drilling

Abstract

The invention discloses a universal method for forecasting in-target situation of guide drilling. The universal method includes: on the basis of survey data of last two survey points of a real drilling trajectory, calculating trajectory characteristic parameters of unsurveyed sections; calculating trajectory parameters of a well bottom point on the basis of the trajectory characteristic parameters of the unsurveyed sections of the real drilling trajectory; establishing coordinate transformation relations between a general target plane equation as well as a target coordinate system and a wellhead coordinate system; according to a landing-controlled anticipating guide drilling technology, determining a borehole trajectory model and the trajectory characteristic parameters of a forecasting trajectory and establishing a coordinate equation of the forecasting trajectory; establishing and calculating a constraint equation of the forecasting trajectory to acquire well section length of the forecasting trajectory; calculating the in-target location and judging whether a target is in place or not and forecasting the in-target direction. By the universal method, the target-in location and the target-in direction can be forecast, and the universal method is applicable to different well types like directional wells and horizontal wells even to special formed target sections and various drilling modes like sliding guide drilling, rotating guide drilling and composite guide drilling.

Description

technical field [0001] The invention relates to petroleum drilling engineering technology, in particular to a general method for predicting the target situation of steerable drilling. Background technique [0002] In order to meet the requirements of oil and gas exploration and development, improve the success rate of oil and gas exploration, development recovery and oil and gas well production, the "geological design" of each oil and gas well defines the target location and target area range. Industry standard requirements: the design trajectory should pass through the target point, while the actual drilling trajectory should be controlled within the target area. Usually, vertical wells, directional wells, and extended-reach wells have one target point, and the target area is a horizontal circular area; horizontal wells generally have two target points, and the target area is an oblique cuboid. [0003] In order to facilitate the evaluation of the extent to which the wellb...

AI Technical Summary

Problems solved by technology

[0005] At present, the existing wellbore trajectory prediction technology relies on the steerable drilling method, which is not universal; moreover, it lacks the wellbore trajectory prediction technology targeting the target area, and it is difficult to meet the engineering needs of accurately predicting the target position and direction

Images