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Book Air and Gas Drilling Manual

Download or read book Air and Gas Drilling Manual written by William C. Lyons and published by Gulf Publishing. This book was released on 1984 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Proceedings SPE Annual Technical Conference and Exhibition

Download or read book Proceedings SPE Annual Technical Conference and Exhibition written by Society of Petroleum Engineers (U.S.). Technical Conference and Exhibition and published by . This book was released on 1988 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydraulic Downhole Drilling Motors

Download or read book Hydraulic Downhole Drilling Motors written by W. Tiraspolsky and published by . This book was released on 1985 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Pneumatic Transport Modeling of Air Gas Drilling Hydraulics in Horizontal and Deviated Wellbores

Download or read book Pneumatic Transport Modeling of Air Gas Drilling Hydraulics in Horizontal and Deviated Wellbores written by Najeem Adeleke and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimal design of any drilling program requires a strong knowledge of drilling hydraulics. Field drilling technicians and drilling engineers designing air/gas drilling projects both typically need to know (1) the time it takes to circulate out a pill of formation material at any given depth in order to reduce drilling time (thereby reducing the cost of drilling); and (2) the optimum rate at which to flow the circulation fluid to ensure the hole is maintained free of cuttings at the minimum capacity (and thereby cost) of surface equipments. While there have been substantial studies and some established techniques for wellbore hydraulics design/analysis for conventional mud drilling, this is not the case for air/gas drilling.To this end, a transient numerical pneumatic transport model has been developed to study air/gas drilling hydraulics. This model is based on a mono-dispersed particulate two-fluid model (TFM). The mathematical representation of the problem involves the solution to coupled non-linear hyperbolic PDE's and therefore a detailed review of monotone and higher resolution schemes for hyperbolic systems is presented. Two hyperbolic model equations: (1) The benchmark Euler equation (2) The mono-dispersed particulate Two Fluid Model (TFM) equation, are presented along with analytical expressions for their decomposed characteristics. The Euler equation is used to demonstrate the efficacy of the numerical schemes discussed. The most efficient numerical scheme is then applied to solve the TFM equation. Numerical results compared to experimental data were satisfactory.The experimental work of Temple was used to evaluate the model for annular vertical wellbore air drilling flow conditions. Flow characteristic curves (FCC) that cover both dilute and dense phase flow conditions were generated. Simulation results showed a good match with experiments. While matching the data points in the dilute phase flow region was less precise towards the extreme end of the larger particles, the optimum flow velocity was still accurately predicted at 9.1 %AAD.Unlike vertical flow, air drilling experiments for horizontal flow pneumatic transport are difficult to come by. This applies to industry field data as well as they are usually incomplete and typically labeled as confidential information. Therefore horizontal pneumatic transport studies for food processing applications were used to evaluate the performance of the current model for horizontal and highly-deviated well systems. The area ratio correlations were incorporated into the TFM to account for the lower-side deposition and re-entrainment phenomenon peculiar to horizontal wells. While we were able to show a match in the FCC plots in the dilute flow region, it was difficult to establish a match for the dense phase region of the FCC plot. Predicted pressure drops in dense flow region of the FCC plot for horizontal systems were significantly lower than experiment. This was due to the inability of the current model formulation to account for slug flow regime typical of horizontal pneumatic transport systems transitioning from dilute to dense flow conditions.Overall, it was observed that the model is capable of predicting volumetric rate requirements and circulation time for hole cleaning in vertical wells. The model is also capable of estimating cutting circulation time in horizontal and deviated well sections while in dilute flow conditions only. However, the model was unable to accurately simulate the inherent transient behaviors expected under dense horizontal pneumatic transport. More studies need to be conducted in the area of constitutive relations specific to horizontal pneumatic transport flow regimes and empirical relations for the prediction of critical velocities. These will provide the capability of upgrading the current model for the prediction of fluid volumetric rate requirements in horizontal/highly-deviated well sections particularly under dense flow conditions.The transient model was also used to predict circulation time for dispersed slugs of cuttings from the bottom of a well with both vertical and horizontal sections. The model results can only be trusted to predict accurately when the flow in the horizontal section is maintained within the dilute flow region. In order to ensure that the flow in the horizontal section is maintained above flow condition, we developed correlations for optimum circulation velocity using three distinct data sets for both vertical and horizontal pneumatic transport systems in the literature. Our results showed a relative error less than 10 % for most data points and RMSRD less that 5.1 %.

Book Numerical Simulation of Heat Transfer in the Drive Plate of a Nutating Engine

Download or read book Numerical Simulation of Heat Transfer in the Drive Plate of a Nutating Engine written by Sunilkumar Patil and published by . This book was released on 2003 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Numerical Simulation of Borehole Temperature Distributions While Drilling

Download or read book A Numerical Simulation of Borehole Temperature Distributions While Drilling written by Richard Eugene Bennett and published by . This book was released on 1970 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Petroleum Abstracts

Download or read book Petroleum Abstracts written by and published by . This book was released on 1993 with total page 1752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Simulation and Interpretation of Borehole Fluid production Measurements

Download or read book Numerical Simulation and Interpretation of Borehole Fluid production Measurements written by Amir Frooqnia and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Downhole production measurements are periodically acquired in hydrocarbon reservoirs to monitor and diagnose fluid movement in the borehole and the near-borehole region. However, because of the complexity involved with physical modeling and numerical implementation of borehole and formation multiphase flow behavior, inference of near-borehole petrophysical properties from production measurements is limited to simplified single-phase reservoir models. This dissertation develops a new transient coupled borehole-formation fluid flow algorithm to numerically simulate two-phase production logs (PL) acquired across heterogeneous rock formations penetrated by vertical and deviated boreholes. Subsequently, the coupled flow algorithm is used to estimate relevant dynamic petrophysical properties from borehole production measurements. The developed reservoir-borehole fluid flow model is based on an isothermal, one-dimensional (borehole axis) version of two-fluid formulation that simulates simultaneous flow of two fluid phases in oil-water, oil-gas, and gas-water flowing systems. Linkage of borehole and formation fluid flow models is carried out by introducing additional source terms into borehole mass conservation equations. Transient simulation of two-phase production measurements indicates the presence of borehole cross-flow when performing a shut-in test across differentially-depleted multilayer reservoirs. In a two-layer synthetic reservoir model penetrated by a vertical borehole, only two hours of through-the-borehole cross-communication of differentially-depleted layers gives rise to more than 14% increase in volume-averaged oil-phase relative permeability of the low-pressure layer. Simulated borehole fluid properties in the presence of cross-flow are used to estimate formation average pressure from two-phase selective-inflow-performance analysis. A new inversion-based interpretation algorithm is developed to estimate near-borehole absolute permeability and fluid-phase saturation from two-phase production logs. The inversion algorithm integrates production logs acquired in time-lapse mode to construct a near-borehole reservoir model that describes depth variations of skin factor over the elapsed time. Feasibility studies using synthetic reservoir models show that the estimated petrophysical properties are adversely influenced by the large volume of investigation associated with PL measurements. Moreover, undetectable fluid production across low-permeability layers decreases the sensitivity of production logs to layer incremental flow rate, thus increasing estimation uncertainty. Despite these limitations, the estimated fluid saturation and permeability across high-permeability layers are within 25% and 20% of the corresponding actual values, respectively. Oil-water and oil-gas flowing systems are additionally studied to quantify the added value of remedial workover operations (e.g., water and gas shut-off). Simulation of a gas shut-off performed in a gas-oil field example recommends a minimum bottom-hole pressure to prevent high gas production caused by (i) gas coning effects, and (ii) released gas from oil solution. Maintaining bottom-hole pressure above that limit gives rise to more than 60% reduction of downhole gas production.

Book Dissertation Abstracts International

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Petroleum Abstracts Literature and Patents

Download or read book Petroleum Abstracts Literature and Patents written by and published by . This book was released on 1988 with total page 1656 pages. Available in PDF, EPUB and Kindle. Book excerpt: