Drill-Pipe Bending and Fatigue in Rotary Drilling of Horizontal Wells

1996 ◽  
Author(s):  
Jiang Wu
Keyword(s):  
Drill Pipe ◽  
Horizontal Wells ◽  
Rotary Drilling ◽  
Pipe Bending

The Forties and Brimmond Fields, Blocks 21/10, 22/6a, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 557-561 ◽  
Author(s):  
A. Carter ◽  
J. Heale
Keyword(s):  
North Sea ◽  
Low Cost ◽  
New Technology ◽  
Horizontal Wells ◽  
Oil Price ◽  
3D Seismic ◽  
Rotary Drilling ◽  
Geological Society ◽  
Recoverable Reserves ◽  
Infill Drilling

AbstractThis paper updates the earlier account of the Forties Field detailed in Geological Society Memoir 14 (Wills 1991), and gives a brief description of the Brimmond Field, a small Eocene accumulation overlying Forties (Fig. 1).The Forties Field is located 180 km ENE of Aberdeen. It was discovered in 1970 by well 21/10-1 which encountered 119 m of oil bearing Paleocene sands at a depth of 2131 m sub-sea. A five well appraisal programme confirmed the presence of a major discovery including an extension into Block 22/6 to the southeast. Oil-in-place was estimated to be 4600 MMSTB with recoverable reserves of 1800 MM STB. The field was brought onto production in September 1975. Plateau production of 500 MBOD was reached in 1978, declining from 1981 to 77 MBOD in 1999.In September 1992 a programme of infill drilling commenced, which continues today. The earlier infill targets were identified using 3D seismic acquired in 1988. Acquisition of a further 3D survey in 1996 has allowed the infill drilling programme to continue with new seismic imaging of lithology, fluids and saturation changes. The performance of the 1997 drilling showed that high step-out and new technology wells, including multi-lateral and horizontal wells, did not deliver significantly better targets than drilling in previous years.In line with smaller targets, and in the current oil price environment, low cost technology is being developed through the 1999 drilling programme. Through Tubing Rotary Drilling (TTRD) is currently seen as the most promising way of achieving a step

The Effect of Drillpipe Rotation on Annular Frictional Pressure Loss

1998 ◽  
Vol 120 (1) ◽  
pp. 61-66 ◽  
Author(s):  
X. Wei ◽  
S. Z. Miska ◽  
N. E. Takach ◽  
P. Bern ◽  
P. Kenny
Keyword(s):  
Horizontal Wells ◽  
Flow Loop ◽  
Rotary Drilling ◽  
Flow Models ◽  
Pressure Losses ◽  
Power Law Fluids ◽  
Drillpipe Rotation ◽  
Pipe Rotation ◽  
Thinning Effect ◽  
Good Agreement

Accurate predictions of annular frictional pressure losses (AFPL) are important for optimal hydraulic program design of both vertical and horizontal wells. In this study, the effects of drillpipe rotation on AFPL for laminar, helical flow of power law fluids are investigated through theoretical, study, flow models were developed for concentric and eccentric pipe configurations assuming that pipe rotates about its axis. A hybrid-analytical solution is developed for calculating AFPL in eccentric pipe configuration. Computer simulations indicate that the shear-thinning effect induced by pipe rotation results in reduction of AFPL in both concentric and eccentric pipe configurations. The pressure reduction is most significant for concentric pipe configurations. For conventional rotary drilling geometry and pipe rotary speeds, the reduction in AFPL is small. A number of laboratory experiments conducted on the full-scale TUDRP flow loop are generally in good agreement with the results of modeling. Available fileld data, however, consistently show an increase in AFPL. This behavior is explained by pipe lateral movement (swirling), which causes turbulence and eventually an increase in AFPL.

Investigation of Drillstring Transverse Vibrations at Rotary Drilling of Inclined Wells

2002 ◽  
Author(s):  
Vadim S. Tikhonov ◽  
Alexander I. Safronov ◽  
Michael Ya. Gelfgat
Keyword(s):  
Horizontal Wells ◽  
Nonlinear Mathematical Model ◽  
Rotary Drilling ◽  
Motion Equations ◽  
Compression Load ◽  
Lateral Vibrations ◽  
Transverse Vibrations ◽  
Drilling Parameters ◽  
Drill Pipes ◽  
Rotary Speed

Significant part of axial compression load transferred to the bit while drilling of wells with high zenith angles is resisted by service drill pipes. By the action of static critical load, buckling of drillstring occurs initially in the shape of a sinusoid and subsequently, as the load increases, in the shape of a helix. Drillstring rotation promotes the occurrence of critical modes. As a result the drillstring can start snaking motion at the low side of the hole. When the rotary speed grows, whirling of the drillstring can occur with axial load much lower than the buckling load. In this paper, a nonlinear mathematical model of lateral vibrations of a rotating drillstring in straitened space of a straight inclined hole is proposed. A numerical method to solve drillstring motion equations has been developed that allowed to reduce time of computation. This made it possible to conduct a detailed study of how the main drilling parameters (compression load, drillstring rotary speed, hole angle, friction factor, etc.) effect drillstring motion in the well. Results of the study may be used to choose drillstring operation modes for rotary drilling of inclined and horizontal wells.

Successful Use of Mixed Aluminum-Steel Drill Pipe String In Complex Horizontal Wells: Case Study

2014 ◽  
Author(s):  
Stephane Menand ◽  
Jeffry Lehner ◽  
Nigel Evans ◽  
Aaron Palmer ◽  
Metcalfe Arthur
Keyword(s):  
Drill Pipe ◽  
Horizontal Wells ◽  
Steel Drill

scholarly journals Some issues of ensuring the stability of the walls of directional wells and preventing the absorption of process fluids

2021 ◽  
pp. 60-67
Author(s):  
A.N. Popov ◽  
◽  
R.A. Ismakov ◽  
A.R. Yakhin ◽  
I.D. Mukhametgaliev ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Drilling Fluid ◽  
Fluid Pressure ◽  
Polycrystalline Diamond ◽  
Horizontal Wells ◽  
Rotary Drilling ◽  
The Stability ◽  
Diamond Bit ◽  
Hydrodynamic Effects ◽  
The Given

Most of the main types of complications in the process of drilling wells, such as collapses, taluses, collapses of the walls, the formation of caverns, etc., are associated with external mechanical and hydrodynamic effects on the walls of the wellbore. Therefore, ensuring the stability of the borehole walls is one of the urgent and difficult technological formation fluid pressure on mechanical processes in rocks when they are opened with a directional well, especially of horizontal wells. This article provides solutions to problems associated with hydraulic fracturing of a well and the condition of its prevention, calculation of generalized stresses in the rock formation for inclined well. As a result of this calculations, the necessary data are obtained for making a decision on the density of the drilling fluid to drilling the considered interval of rocks, as well as for making other technological decisions. The given calculation formulas make it possible to fully evaluate the effect of the formation fluid pressure on the mechanical processes in the rocks when they are opened by a horizontal well. Keywords: hydraulic fracturing; blade bit; steel ball-shaped toothed bit; polycrystalline diamond bit; laser drilling; impact rope drilling; rotary drilling.

Cause analysis on drill pipe bending and fracture

2010 ◽  
Vol 17 (6) ◽  
pp. 1483-1489 ◽  
Author(s):  
Lv Shuan-lu ◽  
Bing-yin Ji ◽  
Yan-jun Kang ◽  
Hong Zhang ◽  
Terry Qin ◽  
...  
Keyword(s):  
Drill Pipe ◽  
Cause Analysis ◽  
Pipe Bending

On the penetration of tubular drill pipes in horizontal oil wells

2004 ◽  
Vol 218 (9) ◽  
pp. 1063-1081 ◽  
Author(s):  
I McCourt ◽  
T Truslove ◽  
J Kubie
Keyword(s):  
Drill Pipe ◽  
Experimental Studies ◽  
Horizontal Wells ◽  
Oil Wells ◽  
Scale Model ◽  
Coiled Tubing ◽  
Frictional Forces ◽  
Drill Pipes ◽  
Maximum Penetration ◽  
Remedial Work

To carry out remedial work in oil wells through the production tubing string, a method using a continuous length of steel tubing or coiled tubing is used. Furthermore, coiled tubing can also be used for drilling and extending existing wells. In horizontal wells, substantial frictional forces are generated which resist the motion of the tubular drill pipe as it is pushed into the well. As the penetration increases, the frictional forces arising from the contact of the tubing with the inner casing wall increase too, and the tubular pipe buckles. The buckling is initially sinusoidal but eventually transforms into helical. At this point the force required to push the tubular drill pipe rises dramatically, and the maximum penetration is then rapidly reached. To date, scale model experimental studies on horizontal wells have not reproduced the actual conditions occurring in the wells. A new experimental rig has been designed that allows for the simulation and observation of all significant parameters. An analytical model has also been developed which is in excellent agreement with the experimental data. Governing modelling parameters have been identified which suggest ways to increase the penetration of tubular drill pipes in production oil wells.

An Analysis of Common Drill Stem Vibration Models

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Mohammed F. Al Dushaishi ◽  
Runar Nygaard ◽  
Daniel S. Stutts
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Equations Of Motion ◽  
Drill Pipe ◽  
Beam Theory ◽  
Operating Conditions ◽  
Analytical Models ◽  
Clear Trend ◽  
Rotary Drilling ◽  
Drill Stem

Excessive drill stem (DS) vibration while rotary drilling of oil and gas wells causes damages to drill bits and bottom hole assemblies (BHAs). In an attempt to mitigate DS vibrations, theoretical modeling of DS dynamics is used to predict severe vibration conditions. To construct the model, decisions have to be made on which beam theory to be used, how to implement forces acting on the DS, and the geometry of the DS. The objective of this paper is to emphasize the effect of these assumptions on DS vibration behavior under different, yet realistic, drilling conditions. The nonlinear equations of motion were obtained using Hamilton's principle and discretized using the finite element method. The finite element formulations were verified with uncoupled analytical models. A parametric study showed that increasing the weight on bit (WOB) and the drill pipe (DP) length clearly decreases the DS frequencies. However, extending the drill collar length does not reveal a clear trend in the resulting lateral vibration frequency behavior. At normal operating conditions with a low operating rotational speed, less than 80 RPM, the nonlinear Euler–Bernoulli and Timoshenko models give comparable results. At higher rotational speeds, the models deliver different outcomes. Considering only the BHA overestimates the DS critical operating speed; thus, the entire DS has to be considered to determine the critical RPM values to be avoided.

FIELD-TESTING A THROUGH-THE-BIT HIGH-DEFINITION ELECTRICAL BOREHOLE IMAGER FOR OIL-BASED MUD

2021 ◽  
Author(s):  
Richard Bloemenkamp ◽  
◽  
Elia Haddad ◽  
Nadege Bize-Forest ◽  
Laetitia Comparon ◽  
...  
Keyword(s):  
Field Test ◽  
Drill Pipe ◽  
Horizontal Wells ◽  
Tool Geometry ◽  
Electromagnetic Signal ◽  
Drill Bit ◽  
Processing Scheme ◽  
Imaging Tool ◽  
Well Development ◽  
Borehole Imaging

A new, through-the-bit, ultra-slim wireline borehole-imaging tool for use in oil-based mud provides photorealistic images. The imager is designed to be conveyed through drill-pipe. At the desired well section, it exits the drill pipe through a portal drill bit and starts the logging. Field test measurements in several horizontal, unconventional wells in North America show images of fine detail with a large amount of geological information and high value for well development. A relatively new solution for conveying tools to the deepest point of a high angle or horizontal wells uses a drill bit with a portal hole at the bit face. As soon as the bit reaches the total depth, a string of logging tools is pumped down through the drill pipe. The tools exit the bit through the portal hole, arriving in the open hole and are ready for the up log. The tools operate on battery and store the log data in memory so that no cable is interfering as the drill pipe is tripped out of the well while the tools are acquiring data. The quality of wireline electrical borehole images in wells drilled with oil-based mud has significantly improved in recent years. Modern microresistivity imagers operate in the megahertz-frequency range, radiating the electromagnetic signal through the non-conductive mud column. A composite processing scheme produces high-resolution impedivity images. The new, ultra-slim borehole-imager tool uses these measurement principles and processing methods. Innovating beyond the existing tool designs the tool is now re-engineered to dimensions sufficiently slim to fit through drill pipes and to use through-the-bit logging techniques. The new, ultra-slim tool geometry proves highly reliable and, due to the deployment technique, highly effective in challenging hole conditions. The tool did not suffer any damage and showed only minute wear over more than twenty field test wells. The tool’s twelve-pad geometry provides 75% coverage in a six-inch diameter borehole and its image quality compares very well with existing larger tools. The field test of this borehole imaging tool covers all scenarios from vertical to deviated and to long-reach, horizontal wells. Geological structures, sedimentary heterogeneities, faults and fractures are imaged with detail matching benchmark wireline images. The interpretation answers allow operators of unconventional reservoirs to employ intelligent stimulation strategies based on geological reality and effective well development. A new high-frequency borehole imager for wells drilled with oil-based mud is introduced. Deployed through the drill pipe and its portal bit, the imager carries photorealistic microresistivity images into wells where conventional wireline conveyance techniques reach their limits in both practicality and viability.

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