Drill pipe on the advantages and disadvantages of rock debris slurry!

Classification:

Industry dynamics

Release time:

2020-06-28

【Summary Description】 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. In the drilling work of drill pipe, rock cuttings slurry will also play a very important role. The following is an introduction to the disadvantages of drilling caused by rock cuttings slurry:
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:
钻杆
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 pipeSticky 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.
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.

Key words:

weilida drill