Development of a novel chemical water shut-off method for fractured reservoirs: Laboratory development and verification through core flow experiments

Ghosh, Bisweswar; Bemani, A. S.; Wahaibi, Y.M.; Hadrami, H.; Boukadi, F.

doi:10.1016/j.petrol.2011.08.020

Cited by 34 publications

(21 citation statements)

References 4 publications

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“…studied/showed/presented/investigated that the nanocomposite gel system has enough gel strength (0.045 MPa) and acceptable gelation time (9‐10 h), which has good plugging capacity for oil fields with induced fractures . Ghosh B et al put forward three chemical fluid compositions to control water production in simulated fractured reservoirs; realizing/discerning the protection of oil phase matrix, the plugging of cracks, the final cleaning of the wellbore and the restoration of matrix permeability respectively …”

Section: Introductionmentioning

confidence: 99%

Study on Profile Control and Water Shut‐Off Performance of Interpenetrating Network Polymer Gel Composite System in Shallow Low Temperature Fractured Oil Layer

2019

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In order to solve the problem/address the issue of oil saturation reduction in the near‐wellbore region of low‐temperature fractured reservoir in Fuyu oilfield, it is especially necessary to carry out in‐depth profile control plugging technology research. In this paper, composite system of particle plugging agent and new interpenetrating network gel were optimally designed, and the non‐fractured cores and fractured cores were used for plugging experiment and oil displacement, the in‐depth profile control mechanism of the composite system was obtained. The results show that the gelation time of the new interpenetrating network gel system can reach 6–7 hours under low temperature conditions (30 °C), with strong shear resistance and viscosity retention. The waterflooding efficiency of fractured core is lower than that of non‐fractured core. After injection of different profile control system, improved recovery efficiency of fractured core is larger than that of non‐fractured core, but the ultimate oil recovery of fractured core is still smaller than that of non‐fractured core. The gelation effect and strength of the composite system are better than that of new interpenetrating network gel agent. The addition of the expanded particles in the system greatly enhances the overall strength and anti‐interference ability. This study can provide theoretical guidance for in‐depth profile control of low temperature fractured reservoirs.

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Section: Introductionmentioning

confidence: 99%

Study on Profile Control and Water Shut‐Off Performance of Interpenetrating Network Polymer Gel Composite System in Shallow Low Temperature Fractured Oil Layer

2019

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“…Li et al (2011) investigated the application of the Hall plot analysis in gel flooding. Gradually, the resistance factor and the residual resistance factor have become quantitative indexes to evaluate the injection effect of chemical flooding (Honarpour and Tomutsa 1990;Sugai and Nishikiori 2006;Ghosh et al 2012). The resistance factor is defined as the ratio of the Hall plot slope for the chemical flood to that for the water flood.…”

Section: Introductionmentioning

confidence: 99%

A new method for evaluating the injection effect of chemical flooding

Hou

Zhang

et al. 2016

Pet. Sci.

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Hall plot analysis, as a widespread injection evaluation method, however, often fails to achieve the desired result because of the inconspicuous change of the curve shape. Based on the cumulative injection volume, injection rate, and the injection pressure, this paper establishes a new method using the ratio of the pressure to the injection rate (RPI) and the rate of change of the RPI to evaluate the injection efficiency of chemical flooding. The relationship between the RPI and the apparent resistance factor (apparent residual resistance factor) is obtained, similarly to the relationship between the rate of change of the RPI and the resistance factor. In order to estimate a thief zone in a reservoir, the influence of chemical crossflow on the rate of change of the RPI is analyzed. The new method has been applied successfully in the western part of the Gudong 7th reservoir. Compared with the Hall plot analysis, it is more accurate in real-time injection data interpretation and crossflow estimation. Specially, the rate of change of the RPI could be particularly suitably applied for new wells or converted wells lacking early water flooding history.Keywords Ratio of the pressure to the injection rate Á Rate of change of the RPI Á Injection efficiency Á Chemical crossflow

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“…12 Ghosh et al 13 found that a cementing force was gradually built between the gelant and fracture face in the process of gel formation, and it contributed to the antiwashout properties of the gel in fracture. Dang et al…”

Section: Introductionmentioning

confidence: 99%

Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

Bai

Xiong

et al. 2016

J of Applied Polymer Sci

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The effect of a polymer on chromium diffusion during gelant injection into fractured media was explored with a polymer/chromium(III) (Cr 31 ) gelant. The capture and barrier effects are two main affecting mechanisms of polymer molecules on the diffusion of Cr 31 , and the formation of the polymer leak-off layer is a key influencing factor. The experimental results show that when the polymer molecular weight (MW) or concentration increased, both the diffusion rate of Cr 31 and the leak-off degree of the gelant decreased sharply. This resulted in the delayed initial production and advanced final production of Cr 31. Because of the changing diffusion rate of Cr 31 and the dilution effect of brine during gelant injection, the change trends of the Cr 31 production from the fracture outlet and matrix ports reversed after the injection volume exceeded a value; this value was named the critical injected volume. During gelant injection into the fractures, under the effects of gravity action and the disproportionate diffusion of Cr 31, the chromium diffusion profiles measured at the fracture top and bottom were different. The chromium diffusion profile along the matrix varied with increasing gelant injected volume, but it finally reached the diffusion equilibrium state in the matrix. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43447.

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Development of a novel chemical water shut-off method for fractured reservoirs: Laboratory development and verification through core flow experiments

Cited by 34 publications

References 4 publications

Study on Profile Control and Water Shut‐Off Performance of Interpenetrating Network Polymer Gel Composite System in Shallow Low Temperature Fractured Oil Layer

Study on Profile Control and Water Shut‐Off Performance of Interpenetrating Network Polymer Gel Composite System in Shallow Low Temperature Fractured Oil Layer

A new method for evaluating the injection effect of chemical flooding

Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

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