scholarly journals THE LAYOUT OF DRILLING STRING FOR IMPLEMENTATION OF THE PROFILE BUILD-AND-HOLE WELLBORE

2018 ◽  
pp. 34-39
Author(s):  
E. G. Grechin ◽  
V. G. Kuznetsov ◽  
G. A. Kulyabin ◽  
Ya. M. Kurbanov
Keyword(s):  
Large Deviations ◽  
Oil And Gas ◽  
Drill String ◽  
Borehole Wall ◽  
Gas Wells ◽  
Oil And Gas Wells ◽  
Drilling String ◽  
Resistance Forces

When drilling deep oil and gas wells with large deviations from the vertical stope the resistance when moving the drill string in borehole significantly increases. A consequence of this is the difficulty of control screw steerable motor. Minimizing resistance forces is possible through usage of a J-shaped profile. The authors present the technique and results of calculation of layout, ensuring reliable integration of the trajectory of the well. This is achieved through the contact link to the bottom of the borehole wall in four locations, including a chisel, curved subs and two pillars.

FE Simulation of Torque and Drag inside Borehole of Oil and Gas Wells (Part II)

2015 ◽  
Vol 723 ◽  
pp. 240-245
Author(s):  
Yousif E.A. Bagadi ◽  
De Li Gao ◽  
Abdelwahab M. Fadol
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth.The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. A FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results.The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

scholarly journals ELASTIC BENDING OF A DRILL STRING IN AN ELLIPTICAL WELL WITH GEOMETRIC IMPERFECTIONS

2021 ◽  
Vol 1 (48) ◽  
pp. 3-11
Author(s):  
Andrusenko E ◽  
Keyword(s):  
Oil And Gas ◽  
Structural Mechanics ◽  
Drill String ◽  
Gas Wells ◽  
Geometric Imperfections ◽  
Elastic Bending ◽  
Runge Kutta Method ◽  
Internal Forces ◽  
Curved Rods ◽  
Resistance Forces

The problem is posed of determining the resistance forces and internal forces in the drill string during drilling and when performing tripping operations in a curved well. The object of the study is the geometry of the centerline of deep inclined well trajectories. The aim of the work is to formulate and solve new problems of structural mechanics about nonlinear deformation of drill strings in directional wells. To study the mechanics of elastic bending of drill strings in directional wells, the methods of structural mechanics of flexible curved rods were used; methods of differential geometry and theory of surfaces; numerical Runge-Kutta method. The study of the influence of geometric imperfections of the borehole centerline on the forces of contact interaction between the drill string and the borehole wall has been carried out. The case is considered when geometric imperfections have the form of a localized spiral of variable radius. KEY WORDS: OIL AND GAS WELLS, CURVED TRAJECTORY, DRILLING COLUMN, RESISTANCE FORCES.

Efficiency of releasing stuck drilling string

2021 ◽  
pp. 14-16
Author(s):  
J.S. Akhundov ◽  
Keyword(s):  
Oil And Gas ◽  
Fractured Reservoirs ◽  
Electrical Measurement ◽  
Gas Wells ◽  
Open Part ◽  
Oil And Gas Wells ◽  
Drilling String

While drilling oil and gas wells, 10–15 % of open part of wellbore consists of permeable fractured reservoirs and horizons. Despite of it, 70–80 % of failures occurring in wellbore fall on the permeable suites. After sticking electrical measurement only upper interval is specified. Then an oil patch is practically installed in abnormally complicated reservoirs in the upper permeable stuck and bottomhole intervals to prevent the complications and blowout. The drilling string often remains stuck beneath the upper suite in three-four suites to the bottomhole. It is necessary to install stepped oil bath to prevent it.

FE Simulating of Torque and Drag inside Borehole of Oil and Gas Wells

2014 ◽  
Vol 1030-1032 ◽  
pp. 781-785
Author(s):  
Yousif E.A. Bagadi ◽  
Abdelwahab M. Fadol ◽  
De Li Gao
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth. The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. a FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results. The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

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