scholarly journals Adaptation of the Winkie Drill for subglacial bedrock sampling

2020 ◽  
pp. 1-9
Author(s):  
Grant V. Boeckmann ◽  
Chris J. Gibson ◽  
Tanner W. Kuhl ◽  
Elliot Moravec ◽  
Jay A. Johnson ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Drilling Fluid ◽  
Fluid Circulation ◽  
Feed System ◽  
Polar Environment ◽  
Drill Fluid ◽  
Diameter Core ◽  
Rock Interface ◽  
Minimal Environmental Impact ◽  
Operation Results

Abstract The Winkie Drill is an agile, commercially available rock coring system. The U.S. Ice Drilling Program has modified a Winkie Drill for subglacial rock and ice/rock interface coring, as well as drilling and coring access holes through ice. The original gasoline engine was replaced with an electric motor though the two-speed gear reducer and Unipress hand feed system were maintained. Using standard aluminum AW34 drill rod (for 33.5 mm diameter core), the system has a depth capability of 120 m. The drill uses forward fluid circulation in a closed loop system. The drilling fluid is Isopar K, selected for favorable properties in polar environment. When firn or snow is present at the drill site, casing with an inflatable packer can be deployed to contain the drill fluid. The Winkie Drill will operate from sea level to high altitudes and operation results in minimal environmental impact. The drill can be easily and quickly assembled and disassembled in the field by two people. All components can be transported by Twin Otter or helicopter to the field site.

Pipe stick problems of deep well drilling

2021 ◽  
Vol 66 (05) ◽  
pp. 192-195
Author(s):  
Rövşən Azər oğlu İsmayılov ◽  
Keyword(s):  
Drilling Fluid ◽  
Drill Pipe ◽  
Drill String ◽  
Differential Pressure ◽  
Drilling Mud ◽  
Fluid Circulation ◽  
Well Drilling ◽  
Deep Well ◽  
Pressure Pipe ◽  
Bottomhole Pressure

The aricle is about the pipe stick problems of deep well drilling. Pipe stick problem is one of the drilling problems. There are two types of pipe stick problems exist. One of them is differential pressure pipe sticking. Another one of them is mechanical pipe sticking. There are a lot of reasons for pipe stick problems. Indigators of differential pressure sticking are increase in torque and drug forces, inability to reciprocate drill string and uninterrupted drilling fluid circulation. Key words: pipe stick, mecanical pipe stick,difference of pressure, drill pipe, drilling mud, bottomhole pressure, formation pressure

scholarly journals Numerical Study of the Application of Polymeric Solutions Based on Ethylene Glycol-Water Mixture for Permafrost Drilling

2019 ◽  
pp. 1-16
Author(s):  
Andrey V. Minakov ◽  
Maksim. I. Pryazhnikov ◽  
Aleksander L. Neverov ◽  
Dmitriy V. Guzei ◽  
Vladimir G. Volkov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Ethylene Glycol ◽  
Numerical Study ◽  
Drilling Fluid ◽  
Water Mixture ◽  
Fluid Circulation ◽  
Polymeric Solutions ◽  
Thawing Permafrost ◽  
Quantity Of Heat ◽  
The Heat Transfer Coefficient

A mathematical model of the conjugate heat transfer of the well was developed subject to phase transitions and drilling fluid circulation during the drilling. Calculations were carried out for the permafrost thaw process around a well while drilling using by solutions with different ethylene glycol contents. It was established the main regularities of conjugate thermohydraulic processes during the drilling of permafrost subject to thawing and solution circulation. It was shown the addition of ethylene glycol leads to a decrease of the heat transfer coefficient and the quantity of heat entering the well, which in turn leads to a significant slowdown in the thawing permafrost process

Analytical Models to Estimate Temperature Profiles During Drilling and Shut-In in Deepwater Environment

2018 ◽  
Author(s):  
A. Rashid Hasan ◽  
Boyue Xu ◽  
Dave Fyfe
Keyword(s):  
Heat Transfer ◽  
Cold Water ◽  
Sea Water ◽  
Control Volume ◽  
Drilling Fluid ◽  
Analytical Models ◽  
Conductive Heat ◽  
Fluid Temperature ◽  
Fluid Circulation ◽  
Target Zone

Drilling operations involve significant heat transfer between the drilling mud, downhole tubulars, and surrounding formation. Such heat transfer causes changes in drilling fluid temperature that alters drilling fluid density and viscosity, as well as changes near-wellbore formation temperature. Temperature changes in the near-wellbore formation need to be understood so that useful interpretation of often available temperature data from multiple discrete temperature sensors (MDTS) may be made. In deepwater assets, fluid circulation through cold water makes the problem more complex. Deepwater drilling operation could be viewed as consisting of four processes: (1) mud circulation in the riser affected by surrounding cold sea water; (2) mud circulation in the cased and cemented zone; (3) mud circulation through the target zone (open hole); (4) shut-in after drilling through the target zone. Forced convective heat transfer dominates in the first three processes while conductive heat transfer is dominant during the shut-in period. Estimating temperature in the wellbore during and after circulation is critical for mud rheology, tubular thermal stress, and cement design. Application of “rule-of-thumb” and/or complicated numerical simulation is often unreliable and/or impractical. This paper presents analytic models to estimate temperature profile during and after drilling fluid circulation in deepwater environment. Steady heat transfer is assumed in during fluid circulation, and transient modeling is performed for shut-in periods. Energy balance is set up over the differential control volume to develop the models. The end of circulation would provide the initial condition for the shut-in period. The models are used to estimate bottomhole temperature distribution during and after circulation. The analytical model is verified using data from a real deepwater well that had permanent downhole gauges (PDGs) installed at the bottomhole.

scholarly journals Viscosity and density of a two-phase drilling fluid

2007 ◽  
Vol 47 ◽  
pp. 141-146 ◽  
Author(s):  
O. Alemany ◽  
H. Mityar
Keyword(s):  
Drilling Fluid ◽  
Ice Core ◽  
Fluid Circulation ◽  
Two Phase ◽  
Fluid Mixture ◽  
Circulation Parameters ◽  
Ice Pressure ◽  
Drill Design ◽  
Hole Closure

AbstractMany ice-core drilling projects expect to reach depths greater than 1000 m. At such depths it is necessary to fill the borehole with a fluid to compensate the ice pressure and avoid the resulting significant hole closure. Knowledge of the ice-chips and drilling-fluid circulation parameters (e.g. flow rate, pressure drop, velocity) is essential for understanding the behaviour of the fluid around the drill and will support drill design through a better parameterization in models. A characterization of the dynamic viscosity and of the density of the ice-chips and drilling-fluid mixture is required to calculate these circulation parameters. The goal of this study is to propose a method to calculate, to a first approximation, both these physical properties. The relationships presented here have been established after experimentation, building on prior assumptions taken from the literature.

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