Comparation of Shale Stabilizer Materials (Polyamine, Potassium Chloride (KCl) and Xanthan Gum (XCD)) To Control Swelling at NAMINO Field.

Abstract

The choices of formulation for making drilling fluid are important to prevent the wellbore or formation collapse. Drilling in shale formation must have contains the shale inhibitor or non-shale reactive to preventing the shale swelling happened. Shale swelling will cause the wellbore unstable during drilling activity, especially in water-sensitive shale and clay formation. The drilling fluid selection determine the optimum additives of drilling fluid that can be control the swelling in the wellbore, especially in NAMINO Field wellbore through the laboratory study. The sample cutting used was from NAMINO field. As a result, variation concentration of potassium chloride (KCl) with 0.5% concentration of xanthan gum (XCD) shows the least filtrate loss around 5.6 ml and swelling result is 7.2%, thus, indicates as the optimum additives to swelling control. Sample N20 shows the optimum drilling fluid formulation to control the swelling by reduced the swelling result in NAMINO Field wellbore. The swelling percentages of N20 sample is 7.2%. In conclusion, drilling fluid contains 3% bentonite, 2% starch, 0.5% xanthan gum (XCD), 3.4% potassium chloride (KCl) in 350 cc fresh water. In addition, potassium chloride (KCl) has effectiveness to control swelling at NAMINO Field wellbore than polyamine.