A Set of Solutions to Reduce the Water Cut in Well Production

Isaev, A.A.; Takhautdinov, Rustem Shafagatovich; Malykhin, V.I.; Sharifullin, A.A.

doi:10.2118/206462-ms

Day 2 Wed, October 13, 2021 2021

DOI: 10.2118/206462-ms

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A Set of Solutions to Reduce the Water Cut in Well Production

A.A. Isaev¹,

Rustem Shafagatovich Takhautdinov²,

V.I. Malykhin³

et al.

Abstract: This paper presents a set of activities to reduce water cut and develop a technical solution to measure water cut: measurement of watercut, flow rates and gas-oil ratio of a well output using a mobile unit. tracer tests and conformance control operations - watercut of reacting wells within Bashkirian stage decreased by 16,6% after those operations were performed. water flow control, flow deviation and remedying production casing damages made it possible to reduce extraction of produced water and… Show more

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2023

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Experimental Study on Fiber Balls for Bridging in Fractured-Vuggy Reservoir

Chen

Huang

et al. 2023

SPE Journal

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Summary For conventional particles used for conformance control in fractured-vuggy reservoirs, large-size particles easily plug the wellbore area but have difficulty plugging the zone far from the wellbore, while small-size particles easily move in depth. In this study, fiber balls for bridging in fractured-vuggy reservoirs were developed by wrapping the fiber in the precrosslinked gel. Due to the influence of temperature and salinity in the formation, the gel degraded and the filamentous fibers were released. Then, the released fibers bridged in the fractures while reducing the safety risk of the injection process. As a water plugging agent, the fiber balls can decrease the conductivity in high-permeability fractures and increase the conductivity in low-permeability fractures, thus improving waterflooding efficiency and enhancing oil recovery. The plugging performance of fiber balls was evaluated by coreflooding experiments. The experimental results show that the optimal formulation of fiber balls is 7% acrylamide (AM) + 3% polyamino acid ester + 0.75% potassium persulfate (K2S2O8) + 4% polypropylene fiber + 4% glass fiber + 0.15% polyethylene glycol diacrylate (PDA) + 0.08% N,N-dimethyl acrylamide (MBA) + 0.1% polyacrylamide (PAM). The release time of fibers from the external gel is 42 to 57 hours, meeting the requirements of conformance control. According to the results of the performance evaluation, the larger the fracture width, the worse the bridging effect of fibers. Besides, the rule of “3/2 bridging” fiber was proposed: When the fiber length is 3/2 times the fracture width, the fiber has the strongest bridging and plugging ability. With the increase in fracture width, the fiber concentration needs to be increased to have a good bridging performance. The results of this study can provide a new idea for the technology of conformance control in fractured-vuggy reservoirs.

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Experimental Study on Fiber Balls for Bridging in Fractured-Vuggy Reservoir

Chen

Huang

et al. 2023

SPE Journal

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show abstract

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A Set of Solutions to Reduce the Water Cut in Well Production

Cited by 1 publication

References 4 publications

Experimental Study on Fiber Balls for Bridging in Fractured-Vuggy Reservoir

Experimental Study on Fiber Balls for Bridging in Fractured-Vuggy Reservoir

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