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.

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.

Mechanical Properties Characterization and Finite Element Analysis of Epoxy Grouts in Repairing Damaged Pipeline

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Lim Kar Sing ◽  
Nordin Yahaya ◽  
Alireza Valipour ◽  
Libriati Zardasti ◽  
Siti Nur Afifah Azraai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Flexural Behavior ◽  
Fe Model ◽  
Element Analysis ◽  
Structural Repair ◽  
Repair Mechanisms ◽  
Infill Material

Oil and gas pipelines are subjected to various types of deterioration and damage over long service years. These damaged pipes often experience loss of strength and structural integrity. Repair mechanisms have been developed in restoring the loading capacity of damaged pipelines, and composite repair systems have become popular over the past few years. The mechanical properties of the putty/grout are critical to their potential application as infill materials in structural repair. In this paper, the compression, tensile, and flexural behavior of four epoxy grouts was investigated through laboratory tests. The stiffness of the grouts for compression, tensile, and flexural was found to be 6 GPa to 18 GPa, 4 GPa to 15 GPa, and 4 GPa to 12 GPa, respectively. The ultimate strength for all grouts was found from 62 MPa to 87 MPa, 18 MPa to 38 MPa, and 34 MPa to 62 MPa under compression, tensile, and flexural tests, respectively. The behavior of all the tested grouts is discussed. A finite element (FE) model simulating a composite-repaired pipe was developed and compared with past studies. The FE results show a good correlation with experimental test with margin of error less than 10%. By replacing the infill properties in FE model to mimic the used of different infill material for the repair, it was found that about 4–8% increment in burst pressure can be achieved. This signifies that the role of infill material is not only limited to transferring the load, but it also has the potential to increase overall performance of composite-repaired pipe.

Design optimization of a pneumatic-powered drilling tool thrust assembly

1998 ◽  
Vol 212 (2) ◽  
pp. 165-170
Author(s):  
G L Ferguson ◽  
R Samineni ◽  
P W Johnson
Keyword(s):  
Carrying Capacity ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Power Source ◽  
Gas Wells ◽  
Drilling Tool ◽  
Oil And Gas Wells ◽  
Flow Through ◽  
Stress Raisers ◽  
Drilling Bit

The petroleum industry is dependent on developing more efficient means of drilling oil and gas wells. A prototype of a new design has been recently demonstrated which places the drilling power source (a pneumatic turbine) down-hole with the drilling bit. However, the thrust assembly shaft used to connect the power source to the bit was not optimally designed. Because of constraints placed on the geometry of the thrust assembly, severe stress raisers exist and these cannot be predicted by traditional analytical means. The conflicting requirements for increasing air flow through the internal passages in the thrust shaft while maintaining the torque-carrying capacity were studied to develop the guidelines for optimizing the thrust assembly.

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.

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