What are the preventive measures for reducing diameter sticking in outer flat drill pipe?

Classification:

Industry dynamics

Release time:

2020-07-07

【Summary Description】 When the outer flat drill pipe is in the stratum without spalling but shrinking strength, use clean water and polyacrylamide (adding 0.2) to drill to the front 10 m of the shrinking formation. Add 2.5 potassium chloride or 1.5 potassium silicate or 1% broad-spectrum wall protecting agent type I at one time according to the whole drilling fluid, and the shrinking formation will no longer shrink.
(I) Prevention of Shrinkage from Drilling Fluid
1.Outside flat drill pipeIn the stratum without spalling but shrinkage strength, drill with clean water and polyacrylamide (0.2%) to the first 10 m of the reduced diameter stratum, and add 2.5 potassium chloride or 1.5 potassium silicate or 1% broad-spectrum wall-protecting agent type I according to the whole drilling fluid at one time, and the reduced diameter stratum will no longer be reduced.
2. In the collapsed and shrinking formation, the drilling fluid performance should be adjusted at one time, the specific gravity should be adjusted to 1.06-1.08, the funnel viscosity should be adjusted to 35-40s, the water loss should be adjusted to 5-4 ml/min, and the salinity should be adjusted to 2-3%, so that the borehole wall will be stable.
3. In soft muddy rock, the main purpose is to increase the specific gravity of drilling fluid, and the minimum specific gravity must be ≥ 1.2.
外平钻杆
(II) Prevention of Shrinkage in Engineering
1. Before the drill bit is lowered into the well, its outer diameter shall be measured. The drill bit larger than the normal well hole must not be lowered into the well.
2. The maximum outer diameter of the fishing sleeve-milling pipe shall be less than 15mm of the borehole.
3. It is found that the outer diameter of the taken out old drill bit is small, and the new drill bit will start ream 100 meters before the bottom of the well.
4. When there is 20 tons of resistance in the drill, you have to draw the drill under the drill.
5. The drill went smoothly, and the last single drill should also be drawn under the eye.
6. For well sections drilled with three-cone, PDC or coring bit shall be used instead, and reaming shall be required if there is any resistance during tripping.
7. The coring well section must be remarked.
8. When tripping out is blocked, it must not be lifted hard. Instead, it should be moved up and down in series. When the maximum lifting force exceedsOutside flat drill pipe50% of the column's own weight is really too difficult to drill down and drill into another 20m.
9. If a qualified drilling team is connected to the drilling jar, whether it is blocked in tripping or in tripping, it can shake the jam.
10. In the section with serious diameter reduction, 4m ream shall be carried out once every 2m of drilling. After drilling a kelly, ream shall be carried out 3 times repeatedly, and 100 shall be carried out every 50m of drilling.
Treatment Method of (III) Shrinkage Sking
1. In case of sticking, the drilling tools shall be moved vigorously to solve the sticking: ① When sticking occurs during drilling, the maximum force shall be applied to lift or twist; ② When the outer flat drill pipe is blocked, press down all the drilling tools and hit them downward with a hanging hammer; ③ When sticking occurs during drilling, only force lifting or twisting shall be applied.
2. Use the jar to shock the release card.
3. Soak with card-release agent.

Key words:

weilida drill