We use “chrome muds” in many wells in our company since last year.
Chrome muds are mainly composed of bentonite, ferro-chrom lignosulfonate, chromenite (our patented material), caustic soda, etc..
Chrome muds have many excellent advantages compared with Ca-system muds or other special muds.
Some of them are as follows:
(1) easy preparation and maintenance
(2) high stability
(3) good inhibition for swelling of shale
(4) low water loss
(5) low cost
In this paper we explain an outline of composition, preparation, maintenance and field results.
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