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AbstractThe candidate selection criteria, job design, and improved implementation techniques are important parameters for success in remedial acidization jobs in mature fields.Effective acid diversion across heterogeneous carbonate reservoirs has always been challenging and is even more difficult when stimulating high-water-cut wells. For these types of wells, it is crucial to stimulate the oil-saturated layers rather than the watered-out layers. Bullheading conventi… Show more
“…Numerous papers have reported the success of deploying "smart fluids" whose viscosity builds up upon contact with water and breaks down upon contact with hydrocarbons ) (Soekama et al 2003) (Shnaib et al 2009), as a means of temporarily plugging the water zones and diverting the subsequently pumped acid to the next available oil zones. As explained in Chang (Chang, Thomas & Fu 1998), the material becomes a viscous gel when contacting brine and degrades when contacting oil.…”
This paper presents a case study of a matrix acidizing treatment in a well located at the neutral zone between Kuwait and Saudi Arabia, whereby the combination of a "smart fluid" in a stimulation treatment pumped through a Coiled-Tubing (CT) with the real time distributed temperature sensing (DTS) technology helped improve the real-time decision process of fluid placement, temporary plugging placement, and treatment efficiency evaluation. As part of the analysis process and to facilitate the onsite decision-making process, a temperature inversion technique was also used to translate the actual temperature profiles into fluid invasion profiles across the horizontal open-hole section of the well. Additionally, a full scale acid placement and thermal modeling is proposed in order to perform an in-depth post-treatment evaluation. The bottom hole data evaluation further confirmed the benefits of using a smart fluid. Following the treatment, the well produced at a rate of 1500 bbl/day with 17% water cut, which is well below the field average of ~50%.
“…Numerous papers have reported the success of deploying "smart fluids" whose viscosity builds up upon contact with water and breaks down upon contact with hydrocarbons ) (Soekama et al 2003) (Shnaib et al 2009), as a means of temporarily plugging the water zones and diverting the subsequently pumped acid to the next available oil zones. As explained in Chang (Chang, Thomas & Fu 1998), the material becomes a viscous gel when contacting brine and degrades when contacting oil.…”
This paper presents a case study of a matrix acidizing treatment in a well located at the neutral zone between Kuwait and Saudi Arabia, whereby the combination of a "smart fluid" in a stimulation treatment pumped through a Coiled-Tubing (CT) with the real time distributed temperature sensing (DTS) technology helped improve the real-time decision process of fluid placement, temporary plugging placement, and treatment efficiency evaluation. As part of the analysis process and to facilitate the onsite decision-making process, a temperature inversion technique was also used to translate the actual temperature profiles into fluid invasion profiles across the horizontal open-hole section of the well. Additionally, a full scale acid placement and thermal modeling is proposed in order to perform an in-depth post-treatment evaluation. The bottom hole data evaluation further confirmed the benefits of using a smart fluid. Following the treatment, the well produced at a rate of 1500 bbl/day with 17% water cut, which is well below the field average of ~50%.
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