... of non-productive time. annular pressure drilling drilling fluid management & disposal talcm geologist rock type circulation formulation well control geology drilling fluids and materials sandstone plug viscosity talcm formulation concentration borehole thermally activated...

... the horizontal shift of the API vertical limits, currently done by the industry. The commonly used slanted ellipse is compared against an adaptation of the circle of plasticity in the form of a horizontal ellipse, showing the convenience of this last one with examples. After the new collapse formulation...

... Abstract Elastic collapse is an important piece of the tubular collapse formulation in API TR 5C3 and ISO 10400. Elastic collapse is significant because it is independent of the strength of the tubing, e.g. K-55 and Q-125 have the same resistance to elastic collapse. Advanced collapse models...

... challenging an application so the higher the WSM loading). Historically, the operator in this study has not explicitly calculated the WSI value during design of a wellbore strengthening formulation. However, upon analyzing past data-sets it became evident that the WSM concentrations used in successful designs...

... mixture is first formulated in the pits to the target concentration. Subsequent samples are then compared to the baseline established for each screen to monitor concentration and attrition. The difference between the reference sample and the samples collected while drilling is used to first establish...

... wellbore pressure Drilling drilling fluids and materials slot disk fracture permeability lab test formulation spurt loss mud loss wellbore Introduction Narrow mud weight windows are frequently encountered during offshore or in-field land drilling. Because of a narrow mud weight window...

... architecture azimuth BHA algorithm formulation attitude control Introduction The automation of directional drilling in the oil and gas industry is rapidly progressing, not only in terms of downstream operations, but also for upstream surface operations with the automation of bulk handling...

... developed to meet these demands. The new fluid system was fully formulated using a multimixer, and the resulting fluids were hot rolled at 150°F for 16 hours to condition the fluid before testing. The conditioned fluids were then further subjected to dynamic or static aging conditions with temperatures...

... are presented which highlight these issues. Experimental work to identify solutions to the practical challenges is presented. A laboratory attrition test developed in-house confirms walnut shell as a promising material to resist grind-down when large particles need to be retained in the system. Formulations...

... and plugging setup described reproduces conditions occurring inside fractures with moderate flow rates. . It was used as a screening tool forfibers and particles to find the optimal ratio between fibers and particles that allows the best plugging properties. Once optimized, the formulation was tested against...

.... This paper gives a complete description of the drillstring calculation. Typical torque-drag problems are studied to compare the two torque-drag formulations. These studies give comparisons in drag forces and torques for the two models, and for the new formulation, the magnitude of the bending moments...

... of fluid friction are present in the effective tension formulation for internal flow. External Flow For complex flows, such as flow in an eccentric annulus, the effective tension concept cannot represent all possible fluid loads on the casing, as represented by the term, Δ W → ef...

... without risk to well control. Second, it is difficult to restore and maintain wellbore strength to a level equivalent to the integrity prior to losses, especially if substantial openhole drilling time is required to reach the next casing point. This paper presents the design strategy, formulations...

... designer mud hydraulic fracturing concentration Case History application wellbore integrity Upstream Oil & Gas circulation pill fracture frack and pack drilling fluid property minimum horizontal stress wellbore pressure wellbore exhibition formulation reservoir characterization...

... of the conventional model is lost. With this new wellbore model, the simple torque-drag model becomes a full stiff-string formulation. The paper gives a complete description of the wellbore trajectory calculation, including tests of circular, helical, and catenary trajectories to verify the accuracy...

.... Polymerization rate is believed to be independent of pressure at the pressures found in the annulus based on literature of high pressure free radical polymerization. 17 The formulation is optimized with respect to initiator and inhibitor types/concentration to ensure polymerization after sealing the annulus...

... standard" formulation. Field experience indicates that the friction coefficient that matches torque data does not match drag data. Why does this model work well in some circumstances, yet not so well in other cases? Part of the problem may lie in the description of the wellbore trajectory and the wellbore...

... pressure in this field required relatively high-density, reservoir drilling and gravel pack fluids (1.65 SG / 13.75 lb/gal). This paper describes the design and development work involved in formulating a mutually compatible, calcium bromide-based reservoir drilling fluid and a Viscoelastic Surfactant (VES...

... finite difference formulations of the wellbore heat transfer equations. Unfortunately, this approach is not adequate to analyze the effects of multiple wellbores. This paper bridges this gap with a technique to evaluate the thermal proximity effects of multiple wellbores. The method is based...

... is derived and presented. It is shown to be in the range of the rotary speeds used in modern extended reach applications. The analytical results are verified using a versatile finite element formulation to model the drillstring in greater detail. Animated time domain simulations with this model provide...