In my experience bio based oil well cement retarders do not provide the consistency needed to accurately control thickening time in oil well cements. The main reason is that natural organic retarders production varies from lot to lot and batch to batch. Down-hole conditions, process control and small variations in cement quality; all play a major part in the inconsistencies of natural organic retarders and other biopolymers used in the industry. Those such as the cellulose derivative, hydroxyethylcellulose, used as a common fluid loss additive in oil well cementing, experience the same pitfalls as other biopolymers within the oil and gas industry.
If we take a look at an organic molecule and a synthetic polymer both used to control thickening time of the cement slurry, we can easily see why it is the much safer and best choice to opt for a synthetic product.
Thickening time, however, depends as well, on the job conditions, the validity of the BHST, determination of the BHCT, mix water preparation, density control and other operational aspects. This is the role of the service company, but if we take aside the necessary design and operational controls it is clear that the first step to make consistent and predictable cement slurry is to treat it with synthetic additives.
Recently I came across a system that claims to provide excellent results and even more important, reproducibility in thickening within a very, very low standard deviation. This is a great advantage to lower cost, laboratory time (e.g., equipment usage) and increase the service quality we deliver to our costumers. Well control, zonal isolation and well integrity are as well positivity affected maximizing well security and operational safety.
This synthetic retarder provides reproducible results, increases safety through additive engineering, which in turn offers predictable results based on the system’s designed linearity. The system offers excellent fluid loss data, thickening time results, rheology, strength retrogression, expandability; it is cost effective and rigid. It has thermal stability and can perform in HPHT conditions (temperatures as high as 450 F), as well as in temperatures as low as 100 F. The linear response makes this state of the art and a safe-to-use oil well cement system.
After probably only few years in the industry, we all know well that biopolymer-based systems commonly used have entirely too much variance and other side effects. Sure, they work but there is no true predictability and that can be very laborious for our laboratory guys with obvious implications in service quality.
Here I will introduce a simple true, we all know: The more time the slurry spends in the lab the higher the risk for the well
This can be dangerous and costly to operators.
Biopolymers, although they are derived in a naturally organic way, their quality may vary significantly from lot to lot. This makes inventory control more difficult for services companies, in addition to what was already mention, all with tremendous effect on service quality. On the contrary, a synthetic system will provide accuracy time after time. This synthetic product, like any other, is man made, so reaction environment is controlled, and it does not change. It’s purely linear, so if you want 2hrs., you can treat with 0.02gal/sks ….. if you want 3 hrs. You can treat with 0.03gal/sks, for instance.
For inquiries about this product and how you can obtain samples and brochures, send email to email@example.com