First, the use of products
Drilling fluid with superfine calcium carbonate. It is an acid solution of soluble marble powder, used in drilling fluid and completion fluid and workover fluid crosslinking agent, can also be used as oil or water-based mud plugging or crosslinking material injury, while drilling to the reservoir to prevent differential pressure sticking or soil loss. Its distribution is very thin and can not penetrate the block structure. Products are commonly used in drilling fluid quality additives, has a strong anti leakage and blocking effect, product acid solution, no damage to the reservoir, applicable to all types of drilling fluid system.

Two, technical requirements
Table 1 drilling fluid with physical and chemical properties of ultrafine calcium carbonate 

 

Project		Index
		I type	II type
Density，g/cm3		2.70±0.10	2.50±0.10
Calcium carbonate content，%		≥97.0	≥97.0
Granularity	greater than 20μm	≤20.0	≤5.0
	Less than 2μm	≤30.0	≤40.0
	X50(median diameter)，μm	4.0-10.0	2.0-4.0

Table 2 performance index 

 

Project	Index
	I type	II type
At the beginning of the loss，mL	≤5.0	≤25.0
Filtration loss，mL	≤20.0	≤60.0

Three, the use of methods
When drilling into the oil and gas layer or the target layer, adding the amount of 3-5% directly into the mud, or directly into the completion fluid, can also be used in conjunction with other temporary plugging agent.

Four, storage and transportation
1 products are stored in a dry and ventilated place, avoid direct sunlight and rain, away from fire, kept separate from acid.
2 transport and handling should be light light unloading, packaging to prevent breakage. Transport should be covered.

Five, matters needing attention
1 avoid contact with acids.
2 in the use of the process, the staff should wear self absorption filter dust masks, wear chemical safety glasses, wear anti-static work clothes. Avoid producing dust. Prevent products from entering the eyes or in contact with the skin, once the occurrence of the above situation, with water or saline flush, the situation is serious and timely medical treatment.