Method for evaluating drilling of buckling tubular column in bent horizontal borehole

Abstract

The invention discloses a method for evaluating drilling of a buckling tubular column in a bent horizontal borehole. The method comprises the steps of 1, building a simulation system used for evaluating performance parameters of the buckling tubular column; 2, obtaining initial parameter information of the simulation system in a first test; 3, starting a power device in the simulation system, andobtaining first posture information, which changes along with time, of the buckling tubular column and second posture information of a drill bit in the horizontal drilling process in real time; 4, turning off the power device, and obtaining ending parameter information of the first test; 5, adjusting the initial parameter information, obtaining the initial parameter information of the nth test, repeating the test according to the initial parameter information, and obtaining all information of the n times of testing; and 6, obtaining evaluation information of the buckling tubular column according to all the information of the n times of testing. By means of the method, the drilling state of the tubular column in the bent horizontal borehole can be evaluated rapidly and quantitatively, and the accuracy and real-time performance of evaluation are guaranteed.

Description

technical field [0001] The invention relates to a drilling technology, in particular to an evaluation method for buckling pipe string drilling in a curved horizontal wellbore. Background technique [0002] During the drilling process of the horizontal section of the horizontal well, due to the physical properties of the formation, the tool face needs to be adjusted to achieve the maximum oil and gas layer drilling rate, the manual operation tool face error leads to the need to re-set the wellbore, and there is a detour between the drilling wellhead position and the target layer. Obstacles and other reasons cause the drill bit to continuously adjust the drilling orientation during the drilling process in order to achieve the best drilling state. During this drilling, the horizontal wellbore exhibits some varying degrees of dogleg curvature. The dogleg curvature has a great impact on drilling. On the one hand, when the horizontal wellbore is curved, the drilling process will ...

AI Technical Summary

Problems solved by technology

The dogleg curvature has a great impact on drilling. On the one hand, when the horizontal wellbore is curved, the drilling process will cause wellbore pressure and other phenomena. During the drilling process, it is difficult for the drill bit to contact the formation in place, resulting in the phenomenon of drill bit idling, which affects the drilling footage; too much pressure on the drilling tool will easily lead to increased bending of the drilling tool in the horizontal wellbore, and the effect of the drilling string is complicated. The buckling shape Complex, both rotation and revolution occur in the borehole, the rotation process will affect the movement state of the drilling string, and accidents will occur

On the other hand, the tortuosity of the horizontal wellbore increases and increases, and the process of taking out the downhole drilling tool is prone to a sudden increase in the lifting pressure on the bit, resulting in accidents such as drill sticking or pulling out of the drilling tool.

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