A Drilling Evaluation Method of Buckling String in Curved Horizontal Wellbore

Abstract

The invention discloses a method for evaluating the drilling of a buckling pipe string in a curved horizontal wellbore. The method comprises: step 1: building a simulation system for evaluating the performance parameters of the buckling pipe string; step 2: obtaining the first test result of the simulation system Initial parameter information; Step 3: Start the power device in the simulation system, and obtain the first attitude information of the buckling string over time and the second attitude information of the drill bit in the horizontal drilling process in real time; Step 4: Turn off the power device, Obtain the end parameter information of the first test; step five: adjust the initial parameter information, obtain the initial parameter information of the nth test, repeat the above test according to the initial parameter information, and obtain all the information of n tests; six: according to n times All the information of the test, obtain the evaluation information of the buckling string. The above method can realize rapid and quantitative evaluation of the drilling state of the pipe string in the curved horizontal wellbore, and ensure the accuracy and real-time performance of the evaluation.

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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