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What should pay attention to in the rotary drilling rig operation control
There are six points to 'see' in rotary drilling rig operation and construction: see the geology, see the peers, see the hole opening, see the depth, see the drill pipe, and see the drill bit.
1. Look at the geology
Look at the report: It is very useful to know the geological exploration report to understand each parameter such as geotechnical type, layer thickness, burial depth, state, strength and change, etc. It is very useful to foresee the geological condition in advance for manipulation.
See the core: geological report is converted from geotechnical exploration into a text report. If the construction site has a geotechnical exploration core, direct observation of the core is more intuitive, what stratigraphy at a glance, but requires some geotechnical experience.
See the construction: If the project has started, and there is a rotary drilling rig in construction, you can observe the construction with the construction situation, to understand the current geotechnical situation.
2. Look at the peer
During the examination project, if the project has been started and there is a rotary drilling rig under construction, you can observe the construction situation, determine the technological and construction revenue, and decide whether to undertake the project.
By observing the object of its overall teamwork, management organization, construction technology, drilling tools, control and other details, to find out the optimization of space, so as to have a good idea.
If the observed object is excellent in all aspects, even beyond their own team, then set each other as a benchmark, follow the example of learning each other.
Look at the bailer: with the extension of the borehole depth, the mud pressure increases, but the length of the bailer is short, the location of the bailer is low mud pressure, so the location of the bailer is easy to collapse the hole. Before the collapse of the bailer in the bailer around the collapse of the hole even image, such as bubbling, seepage, etc., observe the condition around the bailer, predict the collapse of the bailer, take preventive or remedial measures in advance.
Look at the liquid surface: the use of mud retaining wall static pressure process, so that the mud surface always maintain a monitorable position, the mud surface is high that the mud pressure is high, conducive to construction, to prevent collapse of the hole. If abnormal phenomena such as slurry leakage occurs, it can also be found at the first time and timely measures can be taken.
4. Look at the depth
Look at the node: remember the node position of each section of the drill pipe extension/receipt, monitor the main roll depth meter, lift and place it to the node, combine the load, vibration and sound changes generated by the drill pipe retraction/extension to determine the normal expansion/extension of each section of the drill pipe and prevent jamming/carrying the rod.
Watch down drilling: Observe the depth of the main roll lowering, decelerate or float when it almost reaches the bottom of the hole to prevent the main roll from messing with the rope (no bottoming protection device).
See the depth of the borehole: monitor the depth of the re-drilling hole, if it is obviously less than the last lifting depth, it may lift the hole to drop slag, shrinkage or collapse; if the hole depth exceeds the last lifting depth, it means that there is a cavity at the bottom of the hole (but the chance of this is very small).
Look at the drilling depth; clarify the current rock and soil, and control the single bucket drilling depth by combining with the current drill bit.
5. Look at the drill pipe
Monitoring the speed of the drill pipe, that is, the feedback drilling load condition, timely change the operation, such as engine speed, shaft pressure output, etc.
Look at the hanging rod: when the first rod is lifted upward, the mud attached to the pipe body flows downward, and the mud viscosity can be known by observing the condition of the first mud hanging rod.
6. Look at the drill tools
Look at the pin: Visually check the pin and insurance of the drill pipe at the first time when the drill is brought up.
Look at the top plate: Look at the top plate of the drill bit, if there is any change in the drilling slag, it means that there may be local collapse of the hole.
Look at the slag: Observe the slag poured out to see its type, color, particle size, etc. Firstly, confirm whether the slag poured out is consistent with the judgment made during drilling, and secondly, there is a gradual process of rock and soil change, so the next bucket of rock and soil can be judged by observing the slag.
Look at the parts: After the bottom door is opened and the slag is poured out, the drill can be rotated to observe the central shaft locking mother and insurance, observe the insurance of the more connected shaft and whether it is strung out, observe the wear of the lower drill body, observe the wear of the drill teeth, and focus on the side teeth and skirt teeth.
Look at the bottom: when closing the bottom door, check the condition of the bottom, the bottom plate must be closed, and the hook must be back in place.
