Complex structural well dynamic friction torque computing method based on similarity theory
A technology with complex structure and calculation method, which is applied in the field of oil drilling and production, can solve the problems of slow calculation speed and blocked field application, and achieve the effects of fast real-time prediction, auxiliary design and optimization, and improvement of calculation efficiency
Active Publication Date: 2018-11-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
[0004] For complex structure wells, aiming at the deficiencies of the existing technology, in order to solve the problems of slow calculation speed and hindered field application in the current calculation met
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[0060] Comparative example:
[0061] As a comparative example, the whole process of the above three-stage system is directly used for finite element numerical calculation, and the torque of the simulated well is 57.9kN.m, which is 56.8kN.m compared with the torque obtained by the calculation method of the present invention. In other words, the error is only 0.018%, and the accuracy can meet engineering requirements, but it saves a lot of calculation time and improves calculation efficiency.
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The invention discloses a complex structural well dynamic friction torque computing method based on a similarity theory. The method comprises the steps of establishing a dynamic model corresponding toan all-well drill string system of a standard well, computing dynamic friction torques borne by drill strings through adoption of a finite element method, and expanding computed data to relatively wide well inclination angle span through adoption of an interpolation method; computing influence of mechanical parameters on a friction torque computing result through adoption of a finite element dynamic model and quantizing a proportion of each mechanical parameter in the friction torque computing result, thereby forming a numerical value law; matching the standard well similar with a simulated well, and estimating similar and different parts between the standard well and the simulated well; and converting the similar and different parts between the standard well and the simulated well into computing numerical values, and obtaining a computing result of the simulated well through adoption of a linear superposition method. According to the method provided by the invention, the problem thatthe existing drill string friction torque computing method based on the finite element method is relatively low in computing speed and is blocked in field application is solved.
Description
technical field [0001] The invention relates to the field of oil drilling, in particular to a method for calculating the dynamic frictional torque of complex structured wells based on similarity theory. Background technique [0002] During the drilling process of complex structure wells, the motion characteristics of the rotating slender drill string under the influence of the contact between the drill bit-rock and the drill string-hole wall are nonlinear, which characterizes complex dynamic characteristics. Coupled lateral-axial-torsional vibration is the main cause of drill string fatigue failure and irregular wellbore formation. During the vibration process of the drill string, elastic instability and bending will occur, and it will be in dynamic contact with the well wall for a long time, which will lead to the problem of drill string friction and torque during drilling operations. Excessive frictional torque not only reduces the torque and WOB transmitted to the drill ...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 祝效华李波
Owner SOUTHWEST PETROLEUM UNIV