DRILLING TECHNOLOGY
1. As against shallow drilling (less than 50 to 100 m); and intermediate drilling (100 m - 1200 m); in a deep exploratory drilling (exceeding 1200 m), would it remain feasible to recover the full core with ease? Or, only, partial core sampling would remain feasible? Or, will we able to produce only the hole and rock cuttings in the absence of a core?
2. Will we be able to recover thermally and mechanically undisturbed cores from such deep exploratory drilling, whereby the obtained rock samples be used for interpretation and testing?
3. For intersections to be used in a resource estimate, whether the total core-recovery value would exceed 85% associated with a deep exploratory drilling?
4. Which is more common in a deep exploratory drilling?
(a) mechanical drilling methods that involves mechanical fracture under the action of stress (direct-push drilling/penetrative sampling/penetrative testing/non-rotational drilling/cable-tool drilling/vibratory-drilling/hammer drilling/ rotary-percussion/top hammer/hydro-percussion core drilling/ water and air DTH hammer drilling/sonic drilling/rotary/dry core/auger/drilling with drilling fluid circulation/drilling with air circulation/drilling with foam circulation);
or
(b) physical drilling methods for rock breaking that involves the destruction of rock structure using hydrodynamic methods such as water-jetting or thermal energy methods (steam drilling or flame-jet drilling).
5. Whether a typical drilling project target require any other details than (a) borehole depth; (b) number of boreholes; (c) required borehole diameter; and (d) core requirements (sample intervals and diameter)?
6. How and when exactly drilling field programs got to be scheduled - when the ground’s access remains much easier - with the least possible environmental damage?
7. To what extent, are we giving importance to hydrological and hydrogeological conditions that might remain important in terms of borehole water seepage and sources of potable and utility water?
8. Whether a sound knowledge on the basic properties of hard rocks (mineral composition, grain size, porosity features and mechanical strength) would by any means try to reduce the required water jet pressure and the requirement on the extremely high energy input?
9. Borehole design needs to be properly justified while casing design could be as simple as possible towards choosing the right and safety drilling method: is it correct?
10. Can we easily deduce the optimal design of well path for extended-reach wells with ultra-high horizontal displacement to vertical depth ratio?
Whether the geo-steering system really allow adjusting the well path as a function of real time formation information, while the rotary steering system really take control of the trajectory?
11. How about the degree of automation in directional drilling?
12. In the context of polymer drilling fluids, although polyacrylamide remains relatively non-toxic to humans, animals and plants, whether the adsorbed acrylamide monomer through dermal exposure and inhalation is not a known neurotoxin and a potential carcinogen?
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