Catalogue

POLYCARBOBLOCK

olycarboblock is a bicomponent composition based on guar resins and a crosslinker that form a polysaccharide gel. The blocking agent density is controlled by injecting an acid-soluble filler. The gel can destroy at the interaction with acid compounds; otherwise, the gel’s action can be prolonged after 48 hours without additional processing. Polycarboblock can be used to eliminate lost circulation of rinsing fluids in productive reservoir intervals, at the sparing killing of wells prone to the heavy filtration of the main killing fluid, and also for temporary well mothballing at the lowering of ancillary self-propelled equipment. The blocking agent can be additionally used as a liquid packer in the drilling in water seepage reservoir intervals, which creates extra backpressure at the RIH/POOK operations with drilling tools.

 

Main specs

no. in sequence	Parameter	Value
1	Density, g/cm3	1,02 - 2,33
2	Effective viscosity, mPa*s	34-148
3	Gel formation period, mins	5-20
4	Gel plastic strength, kPa	15-90
5	Destruction period, h	48
6	Destruction period, HCl 12%, mins	10

 

The blocking agent’s parameters are controlled in a broad range by varying the polymer concentration and injecting the weighting agent for ensuring the required density in a range from 1.02 to 2.33 g/cm³. Marble chips, chalk, dolomite, siderite, or (as required) barium sulfate can be used as fillers. The blocking agent self-destructs no earlier than within 48 hours. Its destruction can be induced by using a 12 volume % hydrochloric acid solution in which case the destruction period is 10-30 minutes.

 

Packaging, storage, and performance

Polycarboblock does not slump or freeze in storage; it it not toxic, has no negative environmental effects, and belongs to hazard class 4 according to GOST 12.1.007-76. Polycarboblock is supplied in 25-kg polypropylene bags with a polyethylene liner. The storage life of the compound is 12 months. Store Polycarboblock is a firesafe indoor dry area at a temperature not exceeding 40°С so as to exclude any risk of exposure to direct solar radiation.



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