THE STUDY OF EFFECT OF CALCIUM CARBONATE SCALE PRECIPITATION TO THE CORE SAMPLE PERMEABILITY

• Main Author: AB NASIR, MUHAMMAD IKHWAN
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2011
• Subjects: T Technology (General)
• Online Access: http://utpedia.utp.edu.my/8752/1/2011%20-%20The%20Study%20of%20Effect%20of%20Calcium%20Carbonate%20Precipitation%20to%20the%20Core%20Sample%20Permeability.pdf; http://utpedia.utp.edu.my/8752/

Generally, scale deposited in downhole pumps, tubing, casing flowlines, heater treaters, tanks, and other production equipment and facilities. The formations of these scales plug production lines and equipment and impair fluid flow. Their consequence could be production-equipment failure, emergency shutdown, increased maintenance cost, and an overall decrease in production efficiency. This prooject was conducted to investigate the permeability reduction caused by precipitation of calcium carbonate scale in few cores from mixing of calcium chloride solution and sodinm bicarbonate solution which create artificial brine. The study will be focusing on the effect of salt concentration to the degree of scaling and to the permeability reduction of the core sample. Two experiments has been conducted which are beaker test and core test. Beaker test was conducted to determine the effect of different concentration to the amount of precipitation where the rate of reaction, nucleation and crystal growth can be observed. Core test was conducted to investigate the effect of different concentration of solution mixture to the permeability of core sample. From the result it shows a large extent of permeability damage caused by calcium carbonate that precipitated on the rock pore surface. The worst case is when I.OM concentration of mixture used where 15% permeability decrease has been recorded when the core sample saturated in the solution. The rock permeability decline indicates the influence of the concentration of brine.