... data acquisition mwd united states government drilling measurement wellbore projection high-resolution trajectory method williston basin curvature continuous inc assumption discrepancy rotary tendency lateral exhibition drilling conference estimation petroleum engineer automated proj...

... Abstract Different methods to calculate torque and drag have been used by the oil industry for years. Various assumptions are used in formulating these models. Opinions have often varied as to which model is better and whether the assumptions are valid. This paper discusses the trilemma...

... Abstract Much of the contemporary literature on kick tolerance relates to the practical aspects of the calculation and the effects of the underlying assumptions and necessary simplifications. It tends to a formulaic approach involving unconstrained uncertainties about pore pressure, kick...

... for this assumption to be accurate, 68.3% of magnetic model and directional sensor error should fall within plus or minus one standard deviation (1σ), 95.5% within two standard deviations (2σ), and 99.7% within three standard deviations (3σ) of the limits defined in the error model. It is the purpose of this study...

... transform approach assumption natural convection multiplier heat transfer coefficient heat transfer wellbore Introduction Deepwater subsea wells are being drilled to deeper depths and exposed to hotter temperatures than in the past. These wells have multiple tubulars and fluid-filled annuli...

... Double-shouldered connections can be analyzed the same way that single-shouldered connections have been for decades. The assumptions presented above are clearly not perfectly true, and may even be significantly inaccurate at some points. However, the long use of those equations gives us...

... be no deceleration taken into account. Thus, the assumption is that the reamer stops instantaneously, which is clearly impossible. This again is a conservative assumption; the calculated torque will always be higher than the actual torque with finite deceleration applied. – No Vibration . There are three...

... in the upcoming revision to ISO TR 10400, its provenance and applicability described, and its assumptions and limitations explained. Present design practice is over-conservative for thick wall pipe, and potentially unconservative for thin wall. It is not the fault of the Barlow equation per se...

... strength BSEE assumption Screening Tool external pressure Introduction Following the April 2010 Deepwater Horizon incident in the Gulf of Mexico (GOM), the regulatory structure in the US was changed to include a higher level of precautionary measures in deepwater and HTHP, drilling...

... Abstract Torque and drag [T&D] are critical elements in drilling deep vertical wells with unnoted tortuosity along the borehole and in extended-reach and deviated wells with high and repeated tortuosity. Current T&D models generate unreliable predictions due to the assumption...

... line speed fastline vibration resonance frequency fastline deflection fast sheave vibration assumption Introduction The fastline is the part of the drill line running between the drawworks drum near the rig floor and the fast sheave near the crown block. Field experience has shown...

... solutions include homogeneous and inhomogeneous Airy functions that can be combined to satisfy various boundary conditions and shortening lengths. The effect of an optional side force is also included in the solutions. The paper discusses the validity of the underlying assumptions, such as linearity...

... for tubular components including connections. The common assumption to ignore friction in tubing analysis is non-conservative in that it may underestimate friction loads, especially downhole at the packer. However, applying the full slackoff load downhole is also unrealistic and overestimates compression...

... borehole frequency Simulation natural frequency drilling operation drill pipe excitation wellbore vibration assembly SPE IADC Drilling Conference excitation frequency assumption drill string modeling vid equation Introduction Horizontal drilling has become a standard practice...

... Abstract The authors are concerned that the claim of increased accuracy for MWD directional surveys processed using multistation analysis (MSA) may not always be valid, resulting in incorrect assumptions regarding the probability of well collision and target intersection. Very little...

... uncertainty assumption requirement precharge plan precharge uncertainty procedure Upstream Oil & Gas air temperature precharge pressure gauge accumulator function sequence deadman autoshear system temperature uncertainty single function sequence well control equipment precharge...

... surface torque new dynamic stiff string model string model stiffness assumption contact force operation wellbore Tikhonov new stiff string model torque stiff string model equation hook load Introduction Soft String Model In the early 1980s the first T&D models were developed...

... c − E t I t Note that for this case, the total axial force is zero, yet there is a positive displacement associated with this zero total-force case. The composite assumption would predict no buckling for this case, but we know that the tubing would buckle in the tubing-only...

... and reducing the operational time in high angel wells and the ability to make changes in well construction. well logging fswd tool log analysis cost savings real time system case 2 upstream oil & gas simulation assumption invasion time spe iadc 140337 flowchart case 1 fswl fishing day...

..., no derivation was ever given, and the result has remained a folk theorem: widely used, but never proved. The industry has therefore been at risk should the result prove to be a severe approximation, or to have unduly restrictive assumptions and/or limitations. This paper provides a rigorous proof...