Everything has two sides. The same is true for rock debris pulping. It has its advantages and disadvantages. Use its advantages and abandon its disadvantages. This is the principle.drill pipeIn the drilling work, rock cuttings slurry will also play a very important role, the following to introduce the disadvantages of rock cuttings slurry to drilling:
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① Reduce the drilling speed. For every 1% increase in rock debris pulping, the drilling speed decreases by 10%. For example, the drilling speed is 12 m/h when the specific gravity is 1.01, and when the specific gravity rises to 1.11, the drilling speed decreases to 6 m/h.
② Cause sticking. The cuttings form a thick mud cake on the borehole wall, which makes the drill collar under the action of the pressure difference. drill pipe Sticky stuck together with mud cake.
③ The drill bit is stuck in mud bag. Due to the thick mud cake on the borehole wall, the drill bit will scrape off the mud cake during tripping out. At the same time, a part of the mud cake will firmly suck the outside of the drill bit, making the outer diameter of the drill bit larger and larger. When the outer diameter of the drill bit is larger than the borehole diameter, the drill bit will be blocked, and the mud bag of the drill bit will easily become stuck.
④ Sticking caused by diameter reduction. The mud cake formed by the cuttings on the sandstone reduces the well diameter, and the drilling is blocked when the pulling force is large.
⑤ Reduce the life of the drill bit. Because the drill bit needs to grind the bottom mud cake repeatedly, the service life of the drill bit is greatly reduced.
⑥ Buried drilling accident. During the process of adding rod or tripping out, rock cuttings sink to fill the space of the outer ring of the drilling tool, resulting in burying accident.
⑦ Increase the pump pressure and reduce the pump volume.
⑧ Rigdrill pipeThe torque increases, the diesel engine load increases.
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⑨ When the rock cuttings are made into slurry to a certain extent, slurry will be discharged, which will pollute the surrounding environment of the well pad.
⑩ Polluted oil layer, drilling in the formation prone to collapse, and moderate slurry of cuttings have a positive effect on the prevention and control of borehole collapse.
Abstract:Down-the-hole hammer drilling and top hammer drilling are two different drilling methods, which have different advantage...
Down-the-hole hammer drilling and top hammer drilling are two different drilling methods, which have different advantages and disadvantages in different application scenarios.
Generally speaking, down-the-hole hammer drilling is usually used for drilling deeper rock formations, while top hammer drilling is usually used for relatively shallow rock formations. DTH hammer drilling can achieve higher drilling speed and better drilling effect by controlling the impact force and the speed of the DTH drill pipe. Therefore, when it is necessary to quickly drill deep rock formations, DTH hammer drilling Holes are usually a better choice.
However, the cost of drill rods and drill bits for DTH hammer drilling is relatively high and requires a large compressed air flow to drive, so it may not be as cost-effective as top hammer drilling in terms of economic cost and use cost. In addition, DTH hammer drilling also requires greater drilling power to drive, so top hammer drilling may be more suitable when the use environment is limited or the site is small.
Therefore, down-the-hole hammer drilling and top hammer drilling each have their own applicable scenarios and conditions, and the specific choice should be weighed according to specific application requirements and economic costs.
DTH hammers are widely used, mainly including the following aspects:
1. Geological exploration: In the exploration work, underground minerals or other obstacles are often encountered. Using the down-the-hole hammer can dig holes and put in exploration equipment to better complete the exploration work.
2. Rock Mining: Using a down-the-hole hammer can easily penetrate hard rock and break it into smaller pieces, so as to better mine these deposits.
3. Foundation engineering: earthwork and tunnel excavation are one of the fields that require the use of down-the-hole hammers. Through the exploration of underground structures, the foundations of underground buildings can be chiseled out with down-the-hole hammers after positioning.
4. Building demolition: When demolishing a building, it is often necessary to dismantle the deeper part of the wall and ground. At this time, the use of the down-the-hole hammer can better carry out the drilling operation and improve the demolition efficiency.
Generally speaking, the down-the-hole hammer is an efficient and powerful tool with a wide range of applications. Its appearance provides more space for human creativity to play, and at the same time brings a lot of convenience to human beings.
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