In July, , we hosted our first webinar in a series covering drilling fundamentals, the various technologies and their applications. There were plenty of great questions posed in this first webinar in our drilling series, so if you missed it, we thought we’d take the opportunity to answer a few of the most salient ones.
Goto SINOCOREDRILL to know more.
There isn’t a single best method. The various methods each have strengths and weaknesses as they run into clay. For example, air rotary struggles as the clay balls up and becomes hard to lift up. Also, when clays get wet they can swell, so you really have to be careful if you’re drilling with fluid or mud rotary. The depths to which you are drilling also changes equation. Take for example the, the corcoran clay in Central CA, that at 700-800 ft can cause problems. While you cannot hollow stem auger to that depth, if you are only putting in a 75 foot well, auger is really good at getting through the clay.. Air methods definitely have challenges as well. It is difficult for sonic because clay attenuates a lot of energy, much like hitting rock with a hammer as opposed to a pile of playdough.
Hollow stem auger or direct push.
Yes, but it depends on what is meant by “long.” Hundreds of feet is going to be hard on the tooling: you will go through a lot of core barrels, wear out tools and put stress and strain on the rig. It is capable of doing it, but it also depends on the competence of the rock. Sonic works great in siltstone, clay stone or weathered rock. Pure granite is going to be different and so definitely depends on how long you are talking about. At 20 – 30 feet, the headache of switching over doesn’t offset the difficulty of penetration, but it is worth considering other methods if you’re dealing with hundreds of feet.
You can’t measure something without changing it, and there is no drilling method that doesn’t disturb a sample. However, from the geotechnical perspective, Shelby tubes pushed with auger or rotary wash are pretty undisturbed. The sonic method of penetration liquefies the particles in the immediate vicinity of the bit interface so it’s disturbing the soil as it is going down. If you stop and push a Shelby tube once you get away from that bit interface, you should have an undisturbed sample at some point, but it is hard to know exactly how far the extent of the disturbance goes. The amount of disturbance is generally on the scale of inches or fractions of an inch. If you need to get through a shallow material that’s impenetrable to auger or rotary wash methods, Sonic at least gets you to where you need to be in order to push a sample. Afterall, it’s better to have some data than no data.
When you override the casing, like a 4 inch diameter to a 6 inch outside casing, that couple inches of material between the two has to go somewhere. The short answer is that is get displaced into borehole wall. If you are circulating water when running the outside casing, commonly known as washing over the casing, it can cause cuttings to return back out of the hole. Drillers typically have a pan at the surface to catch the returns coming back up. So, not all cuttings are getting shoved into the formation. As for how much water to use - that varies a lot on geology and driller experience.
Generally you do not use mud rotary for core sampling. You can take a split spoon sample by tripping out the tri cone bit and drill pipe, running in a split spoon barre and then driving a discrete soil sample. If you need to collect a core, there is a coring system called 94 mm wireline using wireline coring for unconsolidated material. You run the wireline in the mud hole with the drilling fluid to advance the core system. If you want a continuous core with mud rotary, wireline coring would be the best recommendation.
During the webinar we mentioned that the flush threaded casing is able to isolate different aquifers from one another. The best way is by telescoping a smaller diameter casing into the larger casing. For example, say aquifer A is shallow and aquifer B is deep, and you want to make sure those aren’t talking to each other during the drilling process. You would drill down to the barrier that separates the two aquifers, set an 8 in diameter casing, then continue to aquifer B with 4in x 6in override, thus telescoping the smaller into the larger.
Mud rotary is always good because you are able to use the hydrostatic pressure of the mud. You might, however, have to run a different kind of fluid program (usually denser mud maybe with polymers). Sonic is also a good option due to the flush threaded casing. That allows you to hold the head pressure on the formation as you drill. With hollow stem auger, the augers are bolted together and have open joints so they can’t hold the head pressure as well. With sonic, once you get past whatever the zone is that has the heave, you are able to cast it off, and then physically isolate it with steel so that it’s not continually giving you problems.
There are four parameters to track during mud rotary drilling: density, viscosity, filter cake, and sand content. The filter cake gets measured in two different ways: (1) thickness that is created on the borehole wall, and (2) relative impermeability of the filter cake. This is determined by a Filtrate Loss Test where you take a sample of mud and put it under pressure on filter paper. The amount of water able to get through in terms of volume and again and the thickness of filter cake, tells you what you need to know. Keep an eye out for a Drilling Fluid Fundamentals webinar, because that’s an hour long discussion in and of itself.
HQ NQ PQ Core Barrel , 10 Feet Wireline Core Barrel for exploration core drilling
Exploration diamond drilling is used in the mining industry to probe the contents of known ore deposits and potential sites. By withdrawing a small diameter core of rock from the orebody, geologists can analyse the core by chemical assay and conduct petrologic, structural and mineralogical studies of the rock.
Roschen introduced the wireline core retrieval system in , being the first diamond drilling exploration product manufacturer to offer this revolutionary system. The Roschen design engineering team continued to refine the initial system, resulting in the launch of the industry-standard patented Q wireline system in .
We offer a complete range of genuine Q wireline coring system components including wireline tools, rods and casing, and coring bits.
Our Q, Q TK*, Q 3, Q TT systems are designed to increase core recovery and productivity in any drilling condition, delivering greater efficiencies and reliability to the driller. Whether drilling a standard DCDMA hole or a project requiring a split tube to retrieve soft, highly fractured formations – the Genuine Q Wireline Coring System is proven to perform.
NQTK also known as NQ2
GENUINE Q WIRELINE CORING SYSTEM
q-wireline-q wireline coring system Q
Q wireline coring systems are ideal for use in most drilling conditions and are available for application in standard DCDMA hole sizes (A, B, N, H, P). The standard system consists of the core barrel assembly and the overshot assembly. The core barrel assembly is composed of the inner-tube and outer-tube groups. The inner-tube group collects the core sample during the drilling process and is independent of the outer-tube group.
Q-wireline-tk wireline coring system Q TK
With the goal of providing our customers a larger diameter core sample without increasing the hole diameter, Boart Longyear introduced the Thin Kerf (TK) wireline coring system option. Q TK wireline systems are optimized to allow for a larger core sample while retaining the same hole, low fluid pressure, and robust inner and outer. Q TK systems are offered in the A, B, and N sizes.
NQTK also known as NQ2
Q-wireline-3 wireline coring system Q 3
The Q 3 wireline coring systems consist of the same groups as the Q and QTK but utilize a third tube called an inner-tube liner or split tube. The liner is placed inside the inner-tube. This system enables integral core recovery when drilling coal, clay bearing, or highly fractured formations. The liner, or spit tube, retains the core sample in its received state for easier loading into sample trays or for storage and subsequent presentation to the geologist. The Q 3 is available in N, H and P sizes.
wireline coring system Q TT
The Q TT system is similar to the Q 3 system but includes a specialized core lifter case and bit. These components enable change in the water flow by creating a seal which routes water flow away from the inner-tube further improving core recovery. The Q™ TT utilizes a specially designed piloted core lifter case that improves core recovery and reduces core washing by directing fluid flow away from the ID of the core bit. Core bits are made for a 3-tube core barrel system and require face discharge ports or deep ID waterways.
Are you interested in learning more about Wireline Core Barrels factory? Contact us today to secure an expert consultation!
Standard "Q" wire line bit sizes Size Hole (outside) diameter, mm Core (inside) diameter, mm AQ 48 27 BQ 60 36.5 NQ 75.7 47.6 HQ 96 63.5 PQ 122.6 85 CHD 76 75.7 43.5 CHD 101 101.3 63.5 CHD 134 134 85 Q Series Wireline Core Barrel System Sizes SIZE CORE Ø HOLE Ø AQTK 35.5 mm (1-3/8 in) 48 mm (1-7/8 in) BQ 36.4 mm (1-7/16 in) 60 mm (2-3/8 in) BQTK 40.7 mm (1-5/8 in) 60 mm (2-3/8 in) NQ 47.6 mm (1-7/8 in) 75.7 mm (3 in) NQTK (NQ2") 50.6 mm (2 in) 75.7 mm (3 in) NQ3 45 mm (1-3/8 in) 75.7 mm (3 in) HQ 63.5 mm (2-1/2 in) 96 mm (3-3/8 in) HQ3 61.1 mm (2-3/8 in) 96 mm (3-3/8 in) PQ 85 mm (3-3/8 in) 122.6 mm (4-7/8 in) PQ3 83 mm (3-1/4 in) 122.6 mm (4-7/8 in) Roschen Core Barrel System Sizes SYSTEM CORE Ø HOLE Ø mm in mm in A 48,0 1.89 27,0 1.06 B 59,9 2.36 36,4 1.43 N 75,7 2.98 47,6 1.88 H 96,1 3.78 63,5 2.5 P 122,6 4.83 85,0 3.35
Keywords:
Core Barrels
Craelius Core Barrel
Longyear Core Barrel
Boart Longyear Core Barrel
Secoroc Core Barrel
Atlas Copco Core Barrel
Core barrel
Wireline Core Barrel
AQTK Core Barrel
BQ Core Barrel
NQ Core Barrel
HQ Core Barrel
PQ Core Barrel
NMLC Core Barrel
HMLC Core Barrel
BWG Core Barrel
NWG Core Barrel
HWG Core Barrel
AQWL Core Barrel
BQWL Core Barrel
NQWL Core Barrel
HQWL Core Barrel
PQWL Core Barrel
SQWL Core Barrel
Double Tube Core Barrel
Metric Core Barrel
T2-66 Core Barrel
T2-76 Core Barrel
T2-86 Core Barrel
T2-101 Core Barrel
T6-76 Core Barrel
T6-86 Core Barrel
T6-101 Core Barrel
T6-116 Core Barrel
T6-146 Core Barrel
WT SERIES CORE BARRELS:
BWT SERIES CORE BARRELS
NWT SERIES CORE BARRELS
HWT SERIES CORE BARRELS
PWT SERIES CORE BARRELS
WM SERIES CORE BARRELS:
AXM/AWM SERIES CORE BARRELS
AXM SERIES CORE BARRELS
AWM SERIES CORE BARRELS
BWM SERIES CORE BARRELS
NWM SERIES CORE BARRELS
HWM SERIES CORE BARRELS
WG SERIES CORE BARRELS:
BWG SERIES CORE BARRELS
NWG SERIES CORE BARRELS
HWG SERIES CORE BARRELS
WF SERIES CORE BARRELS:
NWF SERIES CORE BARRELS
HWF SERIES CORE BARRELS
BWL Core Barrel
NWL Core Barrel
HWL Core Barrel
PWL Core Barrel
FAQ
Terms & Conditions of Ordering:
Quality warranty:
Our products are made of high quality steel and all spares parts are inspected strictly before shipping. We have quickly responses for your complaint and suggestion.
Package:
Using ply-wooden cases and pallet for package to protect the products and avoid the damage during transportation. Also we can customize package according to your special requests.
Production time:
Generally need 15-25 days
Transportation:
By air, By Express or By sea according to your requests.
1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Handling time for an order
Based on order quantity, normally it takes 20 days for production.
in 3 working days after receiving the advance payment
3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: we suggest by air or by sea.
4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before shipping out.
5. After Services:
a. Our sales team will response for your question within 24 hours (Holidays Excluded)
b. Technical Support will be available in any time
6. Quality & Service:
A. There will be strict inspection and testing for every order before shipping out.
B. Our sales team and Technical Support will response for your question within 24 hours through skype: ROSCHEN.TOOL and /Wechat: +86-
C. Free replacement will provide once the failure confirmed caused or our product quality; Not satisfied with a refund.
For more information, please contact:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 ; +86-135
: +86-137 ; +86-135
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Website: http://www.roschen.com ; http://www.roschen.net
http://www.roschen.cn ; http://www.roschendrill.com
http://www.roschenmining.com ; http://www.roschendrilling.com
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