It helps provide clear, low-solids fluids that minimize damage to formations. Fluids thickened with HEC are easily damaged by acids, enzymes or oxidizing agents to maximize the potential for hydrocarbon recovery.
In fracturing fluids, HEC acts as a carrier for proppants. These fluids can also be easily broken up by the techniques described above. Drilling fluids formulated by HEC use a low solids concept to provide higher permeability and good wellbore stability.Performance-inhibiting fluids can be used to drill medium-hard rock formations, as well as heaved or exfoliated shales.
In cementing operations, HEC reduces hydraulic friction of the mud and minimizes water loss in the formation.
Hydroxyethyl cellulose (HEC) is commonly used in the oil drilling industry as a rheology modifier, filtration control agent, and fluid loss control agent. Here are some general guidelines on how to use HEC in oil drilling:
Decide the appropriate concentration: The amount of HEC that you need to use will depend on the type of drilling fluid you are using, as well as the desired viscosity and other properties. A typical concentration of HEC in a drilling fluid is between 0.1% to 2%.
Add HEC to the drilling fluid: HEC is typically added to the drilling fluid as a dry powder or prehydrated solution. It is important to mix HEC thoroughly with the drilling fluid to ensure that it is fully dispersed.
Mix thoroughly: To ensure that the HEC is fully incorporated into the drilling fluid, mix thoroughly for several minutes. Use a high-shear mixer or an agitator to achieve good dispersion.
Test and adjust: After creating your drilling fluid, it is important to test it to ensure that it has the desired properties. If necessary, you can adjust the concentration of HEC or other additives to achieve the desired results.
Monitor drilling conditions: During drilling operations, it is important to monitor the drilling conditions to ensure that the drilling fluid is performing as expected. If necessary, you may need to adjust the concentration of HEC or other additives to maintain optimal performance.