Best Drilling Equipment (Wuxi）Co., Ltd.

When Diamond in Drilling, It's Physical and Mechanical Properties: 1. Hardness: Hardness is one of the most important properties of diamond. Diamonds have an extremely high hardness, rated 10 on the Mohs scale. Their grinding hardness is 150 times greater than that of corundum and 1000 times greater than that of quartz. 2. Strength: Diamonds possess an extremely high compressive strength. The compressive strength of natural diamond is approximately 8600 MPa, which is about 3.5 times that of corundum, 1.5 times that of cemented carbide, and 9 times that of steel. Synthetic diamonds used for drilling generally require a strength of over 2500 MPa. 3. Wear Resistance: Diamonds have an extremely high elastic modulus (8800 MPa) and a low friction coefficient of less than 0.1 when in contact with metals in air. This gives diamonds exceptional wear resistance, being 90 times that of corundum, 40-200 times that of cemented carbide, and 2000-5000 times that of steel. Synthetic polycrystalline diamonds used for drilling typically require a wear ratio with medium-hard silicon carbide wheels of at least 1:30000.  👉 WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling

Advantages and Disadvantages of Wireline Coring Drilling Wireline coring drilling is beneficial for ensuring safety within the borehole and for penetrating complex geological formations. Due to the small clearance between the drill rod string and the borehole wall, rock cuttings rise quickly, ensuring a clean borehole bottom. The frequency of pulling the core is reduced, which minimizes the exposure of the borehole wall. Additionally, the drill rod string can act as a casing pipe, allowing for rapid penetration through complex rock layers. However, because of the small clearance between the drill rod and the borehole wall, an increase in the volume of flushing liquid can significantly raise the flow rate, making it difficult to prevent damage to the borehole wall. Each time the core is pulled, the suction force is considerable, which also poses a risk of damaging the borehole wall. This is something that must be carefully controlled. Given these advantages, wireline coring drilling can greatly reduce drilling costs. Of course, there are also some drawbacks and issues with wireline coring. For instance, the drilling rods require high precision in their material processing, which makes the rods expensive. The small clearance between the drill rod string and the borehole wall increases the wear on the rods and adds to the resistance in the flushing liquid circulation. Additionally, the walls of wireline coring drill bits are thicker, resulting in poorer performance when drilling through hard rocks. Furthermore, the resistance of the drill rod string during rotary drilling is significant, which can impact high-speed drilling in deep boreholes, leading to higher power consumption. #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling

Advantages and Disadvantages of Wireline Coring Drilling Wireline coring drilling is beneficial for ensuring safety within the borehole and for penetrating complex geological formations. Due to the small clearance between the drill rod string and the borehole wall, rock cuttings rise quickly, ensuring a clean borehole bottom. The frequency of pulling the core is reduced, which minimizes the exposure of the borehole wall. Additionally, the drill rod string can act as a casing pipe, allowing for rapid penetration through complex rock layers. However, because of the small clearance between the drill rod and the borehole wall, an increase in the volume of flushing liquid can significantly raise the flow rate, making it difficult to prevent damage to the borehole wall. Each time the core is pulled, the suction force is considerable, which also poses a risk of damaging the borehole wall. This is something that must be carefully controlled. Given these advantages, wireline coring drilling can greatly reduce drilling costs. Of course, there are also some drawbacks and issues with wireline coring. For instance, the drilling rods require high precision in their material processing, which makes the rods expensive. The small clearance between the drill rod string and the borehole wall increases the wear on the rods and adds to the resistance in the flushing liquid circulation. Additionally, the walls of wireline coring drill bits are thicker, resulting in poorer performance when drilling through hard rocks. Furthermore, the resistance of the drill rod string during rotary drilling is significant, which can impact high-speed drilling in deep boreholes, leading to higher power consumption.  👉👉👉 WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling

Do you know?!Using proper drilling chemicals (MUD) really helps a lot in getting good core recovery！！！ Using proper drilling chemicals (MUD) really helps a lot in getting good core recovery, for smooth and efficient drilling in Diamond Drilling hole especially in soft ground formation or in broken ground, the use of recommendable Drill chemicals supports the drilling operations to progress efficiently and effectively especially in CORE RECOVERY by GOOD MUD MIXING, GOOD required ROTATION RATE depending on the ground formation at a stage, GOOD FEED RATE down penetration, water PUMP PRESSURE RATE is WELL adjusted /CONTROLLED accordingly, making sure that enough supply to cool the drill bit to prevent it from getting burned as drilling in progress/ADJUSTED ACCORDINGLY. MAKING SURE THE INNER TUBE IS WELL SEATED IN THE CORE BARREL ASSEMBLY AND THE TUBE HEAD (BACKENDS) IS WELL ADJUSTED ACCORDINGLY not too long to block the water ways onto the drill bit and also not too short to wash away(soft ground) / grind the core samples (hard ground). Always use split tube and pump out sub whenever the core samples is being extracted from the inner tube at the end of every run of your drill string. Remember to put a block tag and the meter/number at the bottom of your core indicating end of your run as in meters be it 1m , 1.50, 2m, 3m and so on..... 👉👉👉WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling Remark: thanks to tips from Snr. DRILLER/ TRAINER (Diamond Drilling)#Samson Chimwendo

The Impact of Technical Operations on Core Recovery and Quality 1. Inappropriate Selection of Drilling Methods Within the same geological layer, the quality of core recovery varies depending on the drilling method used. Steel shot drilling is characterized by significant vibration and larger gaps in the borehole walls, resulting in finer core samples, which can cause the most wear and damage to the cores. 2. Wear from Different Drill Bit Materials Hard alloy drilling results in less wear, while diamond drilling produces the least wear. Additionally, the cutting and grinding materials on the drill bit can influence the quality of certain ores. For example, when using hard alloy drilling on tungsten or cobalt deposits, the wear particles from the hard alloy can increase the tungsten content in the core samples. Conversely, using steel shot drilling in talc deposits may introduce harmful components, such as iron oxide, into the core. With diamond drilling, contamination of the sampled cores can occur through two common mechanisms: first, diamonds may fall from the drill bit into the flushing fluid and mix with loose cores; second, diamonds can sinter at the bottom of the borehole, forming silicon carbide lumps. 👉 WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling

The Impact of Drill Tool Structure Selection on Core Recovery Rate and Quality 1. A larger drill bit diameter results in coarser cores with greater resistance to fragmentation, making it easier to maintain core integrity and facilitating retrieval. Therefore, within a certain borehole diameter, the larger the ratio of the core cross-section to the borehole cross-section, the higher the recovery rate; conversely, the lower the ratio, the lower the recovery rate. 2. When using bent or eccentric core barrels, drill rods, or drill bits during drilling, inconsistencies in the concentricity of the core barrel can cause the core to be damaged by rotational vibrations. 3. A well-structured drill bit that is suitable for the properties of the rock layer can increase drilling speed and reduce the time the core is subject to damage while in the barrel, which greatly benefits the recovery rate. 4. Steel particle drill bits with excessively long bodies, high waterway entries, or wide openings can hinder core recovery. 5. For diamond drilling, the specifications of the core lifter must meet requirements to reliably secure and retrieve the core. The selection of core retrieval tools is crucial for improving core quality. By choosing appropriate core retrieval tools based on the properties of the drilled rock layer, it is possible to achieve a high recovery rate and obtain representative cores. 👉 WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifter#adapt coupling#locking coupling

Precautions During Core Sampling during drilling exploration (1/2) Avoid the "Single Rod" Phenomenon This means that drilling should not proceed before the inner tube has reached the bottom. If core sampling is conducted prematurely and a "single rod" condition occurs, it will result in losing the core sample, leading to complications such as needing to re-run and clean the hole. For example, if the hole is not clean and there is residual core, the outer tube should not be pushed all the way down at once. Otherwise, the residual core may enter the outer tube, preventing the inner tube assembly from reaching its intended position. This can cause the positioning mechanism to fail, leading to the inner tube moving upward unexpectedly. Issues such as falling core inside the drill rod, and bending of the drill rod and inner tube can all result from this "single rod" situation. 👉 WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond drilling #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot#outer tube#inner tube#core lifte#adapt coupling#locking coupling

W rock formations are typically considered complex, during core drilling exploration? 1. Hard, brittle, fragmented 2. Swelling, shrinkage, disintegration 3. Abnormal pressure formations, leakage, influx 4. Soluble 5. Developed fractures 6. Faults, uncemented fractured zones 7. Prone to deviation, prone to inclination 8. Difficult to core or formations with severely insufficient core recovery 9. High-temperature formations Representative examples include: 1. Soil rock layers that are prone to hydration and expansion, leading to narrowing of the borehole and mud cake on the drill bit. 2. Sandstone, which has good permeability, forming thick mud cakes that cause bit sticking. 3. Conglomerate, which is prone to sticking, jumping, and borehole collapse, resulting in low drill bit lifespan. 4. Alternating soft and hard formations, which can cause well inclination. 5. Soluble rock formations, such as gypsum layers and salt layers, where high concentrations of calcium ions, carbonate ions, and heavy metal ions can damage or dissolve the drilling mud. WA:+8613861728715  for your cost-effective and smooth drilling for mineral exploration! Our “DRILLING TOOLS“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD #diamond core bit #drill rod#exploration drilling#core barrels# reaming shell# head assembly#overshot

Key Points for Reasonably Selecting Diamond Drilling Parameters: During the drilling process, prioritize optimal drilling parameters for rapid drilling by selecting appropriate weight on bit (WOB), sufficient pump flow, and pump pressure. If the formation is complex, it is necessary to adjust the drilling parameters. Start the drilling with light pressure and slow rotation. Once normal drilling conditions are established, switch to conventional drilling practices. When encountering the following situations, reduce the rotation speed: in fractured formations, in formations with strong abrasiveness, and when experiencing hole depth overgauge or bent drill pipes. Additionally, maintain a clear water path to prevent bit overheating, and ensure an appropriate pump flow is maintained. WA:+8613861728715 👈👈👈 for your cost-effective and smooth drilling for mineral exploration! THE “GET“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD

Key Techniques for Core Recovery Operations During Wireline Drilling When the core barrel is nearly full or if the core becomes blocked, immediate action should be taken to retrieve the core. Specific Procedure: 1. Stop the pump and lift the drill string away from the bottom of the hole to break the core. 2. Raise the drill rods on the rig and disconnect at the joint. 3. Retract the drilling rig and screw on the protective sleeve for the drill rods. 4. Lower the overshot into the wash fluid at a speed of 1.5 to 2 meters per second. 5. Once it is confirmed that the lifting dog of the overshot has caught the speardhead point, operate the winch to lift the inner tube. 6. After the inner tube is retrieved from the hole, detach the lifting dog and lower it slowly to prevent bending the extension rod section. 7. At this point, check the core recovery situation. If there is no core within the drill string, you can insert another set of standby inner tubes from the hole into the drill string. 8. Align with the drill rods on the rig and start the pump to pressurize and send the inner tube down, promoting its swift descent. 9. To prevent the inner tube from being obstructed by the steps of the drill rods during descent, you may gently shake the drilling equipment. 10. If there is a loss of circulation and the hole becomes dry, a specialized dry hole packer should be deployed to lower the inner tube. 11. Only after confirming that the inner tube is reliably positioned within the outer casing can you commence slow hole cleaning and continue drilling. 👉 WA:+8613861728715 👈 👈 👈 for your cost-effective and smooth drilling for mineral exploration! THE “GET“ WILL GO EXTRA DEEP THAN YOU EXPECTATION! Best Drilling LTD