Measurements of the Inorganic Scale Buildup Rate on Downhole Completion Equipment – Debris Barrier Screens

2018 ◽  
Author(s):  
Timothy Morrow ◽  
Tariq Al-Daghar ◽  
Andrey Troshko ◽  
Caroline Schell ◽  
Michael Keller ◽  
...  
Keyword(s):  
Barrier Screens ◽  
Buildup Rate

scholarly journals Study on mechanical properties of titanium alloy drill pipe and application technology

2021 ◽  
Vol 261 ◽  
pp. 02021
Author(s):  
Xiaoyong Yang ◽  
Shichun Chen ◽  
Qiang Feng ◽  
Wenhua Zhang ◽  
Yue Wang
Keyword(s):  
Titanium Alloy ◽  
Oil And Gas ◽  
Drill Pipe ◽  
Petroleum Industry ◽  
Drill String ◽  
Curvature Radius ◽  
Outer Diameter ◽  
Gas Field ◽  
Steel Drill ◽  
Buildup Rate

With the increasing intensity of oil and gas field exploration and development, oil and gas wells are also drilling into deeper and more complex formations. Conventional steel drilling tools can no longer meet the requirements of ultra-deep, high-temperature and high-pressure wells. The paper first analyzes the advantages of titanium alloy drill pipe based on basic performance of titanium alloy drill pipe. The experimental results show that the basic properties of titanium alloy drill pipes meet the operating standards of the petroleum industry. Then the buckling performance of titanium alloy drill pipe and steel drill pipe is compared, the calculation results show that the buckling performance of titanium alloy drill tools is slightly lower than that of steel drill tools. Secondly, the maximum allowable buildup rate of titanium alloy drill pipe and steel drill tool is studied. The research shows that under the same condition of the drill pipe outer diameter, titanium alloy drill pipe can be used for a smaller curvature radius and greater buildup rate. This advantage of titanium alloy drill pipe makes it more suitable for short radius and ultra-short radius wells. Finally, taking a shale gas horizontal well as an example, with the goal of reducing drill string friction and ensuring drill string stability, a comparative study on the application of titanium alloy drill pipe and steel drill pipe is carried out. The results show that titanium alloy drill pipe has a wider application in the field, and is suitable for operations under various complex working conditions.

scholarly journals Development of technologies and tools for drilling additional wells from artificial bottom-hole with whipstock of continuous action in hard and very hard rocks

2020 ◽  
Vol 63 (2) ◽  
pp. 86-94
Author(s):  
V. V. Neskoromnykh ◽  
D. V. Lysacov
Keyword(s):  
Axial Load ◽  
Continuous Action ◽  
Empirical Results ◽  
Hard Rocks ◽  
Bottom Hole ◽  
Geological Conditions ◽  
Main Factors ◽  
Materials Used ◽  
Technical Solutions ◽  
Buildup Rate

Background. Various approaches are currently used to create borehole curvature depending on associated methodological and practical geological problems. Continuous action whipstockes are considered to be the most modern and accurate among these approaches. The efficiency of such devices may decrease under difficult mining and geological conditions.Aim. To increase the efficiency of drilling a curved borehole in hard and very hard rocks by reducing the speed of drilling out an artificial bottom.Materials and methods. We studied the operating principles of various types of continuous action whipstocks. Empirical results were determined by studying the operation of continuous milling whipstocks in difficult rock conditions and by studying the materials used for manufacturing artificial bottom holes. The study included optimization of the efficiency of drilling a well in hard rocks from an artificial bottom hole in a new direction.Results. The main factors decreasing the whipstock efficiency were found to be the mechanism of buildup rate, and the different strength of the rock and artificial bottom-hole. A feature of the work of a milling type whipstocks is that the creation of a deflecting force is carried out due to the constant influence of the axial load, the value of which proportionally affects the speed of drilling. A review of the materials used to create an artificial bottom led to the conclusion that at present there are no curable materials that would have a hardness higher than category 8 for drillability, which means that when trying to drill a new direction of a well in rocks more than 8 grade for drillability, the speed drilling with a continuous action whipstocks will exceed the optimum and reduce the intensity of the buildup rate whipstock.Conclusion. Since the rate of drilling an artificial bottom hole is difficult to regulate using the drilling mode parameters, it is necessary to develop technical solutions that would limit the rate of deepening a new direction of the wellbore.

scholarly journals Characterising U-232 and Tl-208 Buildup and Decay on Thorium-fuelled RGTT200K

2021 ◽  
Vol 25 (1) ◽  
pp. 01
Author(s):  
R. Andika Putra Dwijayanto
Keyword(s):  
Fuel Cycle ◽  
Radiation Hazard ◽  
Post Discharge ◽  
Very High Temperature Reactor ◽  
Fissile Nuclide ◽  
High Temperature Reactor ◽  
The Difference ◽  
Very High ◽  
Buildup Rate ◽  
Gamma Emitter

Thallium-208 (Tl-208), a decay daughter of uranium-232 (U-232), is a strong 2.6 MeV gamma emitter present in significant amount in thorium fuel cycle. Its existence enhances the anti-proliferation characteristics of thorium fuel cycle, but at the same time complicates the fuel handling system. In order to ensure that radiation hazard is properly contained, the buildup and decay characteristics of both U-232 and Tl-208 need to be understood. This paper aimed to provide a characterisation on U-232 and Tl-208 buildup in the thorium-fuelled RGTT200K, a 200 MWt very high temperature reactor (VHTR) developed by BATAN, using ORIGEN2.1 depletion code. Pure and impure U-233 were used as the fissile nuclide for comparison. The result showed that U-232 buildup rate is faster in pure U-233, but its Tl-208 buildup is slower. Nonetheless, pure U-233 always has its U-232 and Tl-208 activity lower than impure U-233. Accordingly, both U-232 and Tl-208 radioactivity post-discharge in pure U-233 are lower than impure U-233, although the difference become somewhat negligible after 300 years of decay. Tl-208 activity peaked after 10 years of decay, necessitating different approach in managing post-discharge fuel management.

Estimating CO2 Fluxes Along Leaky Wellbores

SPE Journal ◽  
2013 ◽  
Vol 19 (02) ◽  
pp. 227-238 ◽  
Author(s):  
Qing Tao ◽  
Dean A. Checkai ◽  
Nicolas J. Huerta ◽  
Steven L. Bryant
Keyword(s):  
Large Scale ◽  
Effective Permeability ◽  
Ground Surface ◽  
Surface Flux ◽  
Co2 Fluxes ◽  
Co2 Leakage ◽  
Worst Case ◽  
Leakage Path ◽  
Casing Pressure ◽  
Buildup Rate

Summary Large-scale geological storage of carbon dioxide (CO2) is likely to bring CO2 plumes into contact with a large number of existing wellbores. The flux of CO2 along a leaking wellbore requires a model of fluid properties and of transport along the leakage pathway. Knowing the range of effective permeability of faulty cement is essential for estimating the risk of CO2 leakage. The central premise of this paper is that the leakage pathway in wells that exhibit sustained casing pressure (SCP) is analogous to the rate-limiting part of the leakage pathway in any wellbore that CO2 might encounter. Thus, field observations of SCP can be used to estimate transport properties of a CO2-leakage pathway. Uncertainty in the estimate can be reduced by accounting for constraints from well-construction geometry and from physical considerations. We then describe a simple CO2-leakage model. The model accounts for variation in CO2 properties along the leakage path and allows the path to terminate in an unconfined (constant-pressure) exit. The latter assumption provides a worst-case leakage flux. By use of pathway permeabilities consistent with observations in SCP wells, we obtain a range of CO2 fluxes for the cases of buoyancy-driven (post-injection) and pressure-driven (during injection) leakage. Assuming the frequency distribution is representative of SCP wells, we observe that in leakage pathways corresponding to the slow but nonnegligible buildup of casing pressure (several psi/D), the effective permeability of the leakage path is in the range of microdarcies to hundreds of microdarcies, and the corresponding CO2 fluxes are comparable with naturally occurring background fluxes observed at the ground surface. In pathways corresponding to intermediate and fast buildup rate of casing pressure (tens to hundreds of psi/D), the effective permeability is in the range of tenths to tens of millidarcies, and the CO2 fluxes are comparable with surface flux measurements at the Illinois basin and at the natural seep at Crystal Geyser (Utah). In pathways corresponding to very fast buildup rate (thousands of psi/D), the effective permeability is from tens to hundreds of millidarcies and the CO2 fluxes are up to three orders of magnitude higher than those measured at Crystal Geyser.

scholarly journals Barrier screens: a method to sample blood-fed and host-seeking exophilic mosquitoes

2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Thomas R Burkot ◽  
Tanya L Russell ◽  
Lisa J Reimer ◽  
Hugo Bugoro ◽  
Nigel W Beebe ◽  
...  
Keyword(s):  
Host Seeking ◽  
Barrier Screens

Research on Method of Confirming Typical SWMM Water Quality Parameters

2011 ◽  
Vol 243-249 ◽  
pp. 5308-5313 ◽  
Author(s):  
Hai Yan Li ◽  
Li Tao Yue
Keyword(s):  
Water Quality ◽  
Rate Constant ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Model Parameters ◽  
Rainfall Runoff ◽  
Relationship Of ◽  
The Relationship ◽  
Swmm Model ◽  
Buildup Rate

Taking a roof in Shanghai for example, through the comparison of the relationship of rainfall and SS load in a single rainfall runoff obtained by experiment and SWMM simulation, typical water SWMM model parameters (maximum buildup possible C1, buildup rate constant C2, washoff coefficient S1 and washoff exponent S2) could be obtained. With this method, other cities’ water quality parameters for SWMM simulation could be confirmed, so as to provide basis for simulating water quality by SWMM.

Circadian amplitude and homeostatic buildup rate in postural control

2013 ◽  
Vol 38 (2) ◽  
pp. 192-197 ◽  
Author(s):  
P. Forsman ◽  
E. Hæggström
Keyword(s):  
Postural Control ◽  
Buildup Rate

scholarly journals Using barrier screens to characterize mosquito composition, flight activity, and abdominal status in South Lampung, Indonesia

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Jenna R. Davidson ◽  
Supratman Sukowati ◽  
Shinta ◽  
Puji Budi Setia Asih ◽  
Din Syafruddin ◽  
...  
Keyword(s):  
Flight Activity ◽  
Barrier Screens

scholarly journals Influence of a combined bearing on the buildup rate of a wellbore trajectory control tool

2020 ◽  
Vol 14 (7) ◽  
pp. JAMDSM0109-JAMDSM0109
Author(s):  
Lei SHI ◽  
Jiangang WANG ◽  
Zuowei YANG ◽  
Kai LUO ◽  
Hong ZHANG ◽  
...  
Keyword(s):  
Trajectory Control ◽  
Buildup Rate ◽  
Control Tool
Sign in / Sign up

Export Citation Format

Share Document