Experimental Investigation of Hybrid Gel Performance in order to Control Fluid Loss in Fractured Formations

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Nazemi Rasoul; ASHOORI Siavash; MOGHADASI JAMSHID

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Journal: PETROLEUM RESEARCH Year:2022 | Volume:32 | Issue:6 Page(s): 22-36

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Information Journal Paper

Title

Experimental Investigation of Hybrid Gel Performance in order to Control Fluid Loss in Fractured Formations

Author(s)

Nazemi Rasoul | ASHOORI Siavash | MOGHADASI JAMSHID | Issue Writer Certificate

Keywords

lost circulationQ4

drilling fluidQ4

hybrid gelQ4

formation damageQ4

response surface methodologyQ4

Abstract

gels that have a low viscosity at the time of mixing and form a three-dimensional gel structure after some time delay can be applied successfully in controlling lost circulation. The hybrid gel consists of a cross-linked gel polymer as a continuous phase and an oil as an internal phase. The hybrid gel is cost effective and its properties can be controlled. This study consists of two parts, experimental investigation and empirical modeling using response surface methodology. a number of parameters such as initial gelation time, final gelation time, crosslinking rate and Final viscosity were defined and compared to evaluate the gel behavior under different conditions. First, the effect of pH, temperature and salinity on gel performance as well as the stability of the gel over time were investigated. Then, dynamic stability test for different gels was examined to measure the amount of pressure that the gel in the fractured core can withstand to prevent further fluid loss. Finally, the amount of gel rupture with time in HCL (15 and 28%) was investigated to evaluate the formation of damage of hybrid gel. The experimental results show that hybrid gels can have proper performance and application in industry to combat lost circulation due to their flexible viscosity response and non-damaging properties. response surface methodology(RSM) based on Box-Behnken design was utilized to identify a correlation for prediction of final viscosities of hybrid gel as a function of temperature, pH and salinity. The predicted model was obtained by solving the quadratic regression model. The value of correlation co-efficient (predicted R2 = 0. 88) for the present mathematical model indicated good relation between experimental data and predicted values. Therefore, the proposed model predicts the viscosity of gel adequately within the limits of input parameters being used.

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