How to Plugging the Gravel Layer under the Loess Layer by Geological Drill Pipe

Classification:

Industry dynamics

Release time:

2020-06-29

【Summary Description】 The geological drill pipe shall be drilled with clean water and then the casing shall be cemented with cement. If the water source is sufficient, use clean water to drill to the designed well depth, then lower the casing and fix the casing firmly with cement.
1.geological drill pipeAfter strong drilling with clean water, the casing shall be drilled and cemented with cement. If the water source is sufficient, use clean water to drill to the designed well depth, then lower the casing and fix the casing firmly with cement.
2. If there is no slurry at the bottom of the well, plug the leakage instantly.
3. Use sawdust and high-viscosity leakage plugging agent to stop leakage. Keep 5m of slurry in the mud pit, add 500kg of sawdust and 5 bags of high-viscosity plugging agent, flush for 5 minutes with a sewage pump, flush the rock cuttings originally precipitated in the pit together and send them into the well. After that, send 5m of water to pressurize, so that all 5m of plugging agent can enter the leakage layer, and drill in after 3 hours.
4. Use quicklime (CaO plugging) to throw 0.5-1.0 tons of massive quicklime into the well, drill dry to the bottom of the well one hour later, and then start the pump to resume normal drilling.
地质钻杆
geological drill pipePlugging method for casing leakage
First, the bridge is built with kelp or expansion plug 1-3 meters under the casing shoe. Secondly, according to the leakage characteristics and existing materials, the leakage plugging method is selected.
1. Cementing with cement
① Material: A, 2 tons of cement; B, clear water 0.8m -1m, acidic water is not available.
② Water-cement ratio: 0.4-0.5
③ Lower the drill pipe to 0.3 m above the bridge and start mixing the slurry.
④ Plugging procedure: A. Clean the well with 2m clear water first; B, then inject water slurry; C, after completion, add replacement slurry; D. pressure suppression; E, finally, wait for 48 hours to solidify.
2. Use instant plugging agent
Mix 1 ton of instantaneous plugging agent with 1 ton of clean water for 1-2 minutes, and then quickly send itgeological drill pipeInside, then add replacement slurry water, trip out 100 meters after completion, and then fill the well with water. After 1 hour, normal drilling can be resumed.
3. Plugging with cement slurry
Mix 10m ³ mixed mud into the outside of the casing, and then stand still for 3 hours to block it. Add 10m of clear water and 20kg of cement to the mud tank. After flushing evenly, add 2 bags of high-viscosity plugging agent, and then pour it in from the wellhead. After completion, fill in the slurry with the same volume as the inner volume of the casing, and stop it after 3 hours.

Key words:

weilida drill