The use of non excavation reamers requires attention to the following aspects:
1> Before assembling the drilling tool onto the drill pipe, it is necessary to check the condition of the drill bit or reamer. If it is a used drill bit or reamer, it is even more important to check:
① Do the wheels frame?
② Is the rotation very loose?
③ Is there excessive wear on the tip of the dental wheel palm (the area where the back meets the wheel)? If the rubber ring is exposed, it cannot be used again.
④ Are the threads on both ends excessively worn?
⑤ Is the size of the tooth wheel nozzle suitable for the construction layer? Is it unobstructed?
⑥ Is the centralizer excessively worn? The centralizer is generally 20-30mm smaller than the front hole (the centralizer in broken rock or pebble layers can be smaller than the front hole). The centralizer can stabilize the reamer and reduce wear on the reamer and tooth wheel matrix. If the centralizer is worn too much, it should be repaired in a timely manner.
⑦ Check if there are any open welding areas on the base body of the reamer?
⑧ If it is a used drill bit or reamer, it is necessary to determine whether the reamer can be completed in one go based on wear, crossing length, rock hardness, etc?
Wait a minute.
After completing the above inspection and confirming that there are no problems, the lower hole can be assembled.
2> During the construction process, as a manufacturer of rotary drilling tools, we only provide the following suggestions for speed, drilling pressure, and mud displacement:
① Rotational speed: According to the instruction manual provided with the drilling tool, carry out the construction at the rotational speed.
According to market research, most drilling rig manufacturers currently do not have instruments to display the RPM of the drilling tool, which is the number of revolutions per minute.
For example, the RPM of an 8 1/2 inch rubber sealed roller bit is 60-100 revolutions per minute. It can be calculated that the range of revolutions per minute for a 330mm reamer assembled with the roller palm of this 8 1/2 inch rubber sealed roller bit should be 39-65; It can also be calculated that the RPM range of the 500mm reamer assembled with the 8 1/2-inch rubber sealed cone bit's cone palm should be 26-43.
After market research, it has been found that the RPM of most tooth wheel reamers has not received the necessary attention during use, resulting in the rubber sealing ring losing its sealing effect on the bearing prematurely due to exceeding the usage range of revolutions per minute.
Metal seals belong to high speed drill bits and can withstand approximately twice the rotational speed of rubber seals. At higher rotational speeds, metal seals still have a sealing effect on bearings.
This also has to make us think, can we improve the service life of rubber sealing teeth by increasing the tension and controlling the number of revolutions?
Although there may be slight differences in overall physical properties between rubber sealed teeth and metal sealed teeth, the main difference is still in the speed and lifespan of the bearings. Can we save a lot of drilling costs by using rubber sealed teeth well? This is just a reflection, you can study it.
② Drilling pressure. In oil drilling, we generally refer to it as drilling pressure, and in non excavation, it is called tensile force.
When using a tooth wheel reamer, we should pay attention to the tension and not exceed the range of tension specified in the product's accompanying instructions.
Especially when assembling smaller diameter reamers such as those below 300mm, it is inevitable to use smaller dental teeth, and it is even more important to note that the tension should not exceed the range of use.
③ Regarding mud, as a manufacturer of rotary drilling tools, I have limited construction experience and can only provide limited suggestions as follows.
Pay attention to the mud ratio, observe the instrument during use, and determine the sand carrying situation of the mud. As a drilling tool manufacturer, we hope that the large pieces of rock that have been broken during the operation of the drilling tool can be discharged as soon as possible, rather than repeatedly breaking in the hole, causing excessive wear and tear to the teeth and parent body of the tooth wheel and rinsing. If the sand carrying performance of the mud is poor, it will greatly reduce the construction progress.
After stopping midway and starting the construction again, it is necessary to increase the displacement for sand removal. According to our experience, restarting the drilling rig in the morning is the time when the most jamming occurs.
3> Maintenance and storage of drilling tools.
① Whether it is a roller drill or a reamer, it is necessary to rinse it thoroughly with clean water after use and keep a record of the use of the drilling tool.
The record content includes: project name, location, drilling time, drilling time, effective drilling time (minus rest time), crossing length, average tension, rotational speed, rock type hardness, drilling tool wear, etc.
If the drilling tool is excessively worn, it should be repaired in a timely manner for the convenience of next use.
② When flushing the drilling tool with clean water, it is important to pay attention to flushing the threads and cleaning the thread end faces. After wiping them dry, apply thread oil and assemble thread protectors. Those without wire protection caps can be wrapped in ordinary packaging such as bubble paper to avoid collisions.
③ Even metal sealed roller drills have rubber sealing rings inside, and prolonged exposure to sunlight can affect the sealing performance of the rubber. Whether it is a metal sealed roller bit or a rubber sealed roller bit, it must be placed in a cool and dry place. Composite sealing is a type of rubber sealing that also requires the same treatment.
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