How to allocate drilling fluid for outer flat drill pipe?

Classification:

Industry dynamics

Release time:

2020-06-30

【Summary Description】 In the normal operation of the outer level drill pipe, if the cuttings are not easy to return, it is easy to cause buried drilling accidents. Therefore, if it is found that the amount of cuttings returned outside the well is reduced or not returned, the drilling fluid performance should be adjusted immediately until the amount of cuttings returned is normal.
Outside flat drill pipeIn normal work, if the rock cuttings are not easy to return, it is easy to cause buried drilling accidents. Therefore, if it is found that the return amount of rock cuttings outside the well is reduced or not returned, the drilling fluid performance should be adjusted immediately until the return amount of rock cuttings is normal.
The simplest and most effective way is to add xanthan gum or high viscosity plugging agent to increase the viscosity of drilling fluid funnel for 20-30 seconds, and the cuttings can return smoothly.
外平钻杆
If the rock cuttings are not easy to return because the borehole wall collapses and exceeds the diameter, bentonite must be added on the basis of the above two materials to increase the density of drilling fluid and the strength of network structure, so as to stabilize the borehole wall from collapsing and falling pieces, and carry the rock cuttings and falling pieces out of the well.
What is the relationship between rock cuttings and false shrinkage, sticking drill and bit mud bag?
The cuttings content in drilling fluid will be higher and higher. When the cuttings content exceeds 10% and the water loss is greater than 9ml/30min, the cuttings will form mud cake with a thickness of more than 3 ml on the borehole wall of the second rock section, causing false shrinkage to make the borehole diameter smaller than the outer diameter of the drill bit, causing resistance to tripping. When the false diameter reduction section is very long, after the drilling is stopped,Outside flat drill pipeThe drill collar and drill pipe are tightly bonded to the mud cake of the well wall, causing sticking. In the process of tripping out, the drill bit scrapes off the mud cake, and the mud cake will also be firmly bonded to the outside of the drill bit, making its outer diameter gradually increase. When the outer diameter of the drill bit is larger than the borehole diameter, it will encounter resistance, and the drill bit will be stuck in the mud bag when the pulling force is large.
Factors affecting the properties of bentonite
1. Raw ore quality: The content of montmorillonite in raw ore is the most important factor affecting the performance of bentonite. The higher the content of montmorillonite, the higher the pulping rate of bentonite.
2. Particle size: The finer the particle size, the higher the pulping rate, and vice versa.
3. Additives: reasonable addition of dispersant will significantly improve the performance of bentonite.
4. Water quality: bentonite in high salinity and acid water production rate will be significantly reduced or even no pulp.

Key words:

weilida drill