Abstract
Excessive water production is one of the biggest problems commonly found in the brown water-flood field. There are two treatments of water shut-off (WSO) in hydrocarbon wells. The mechanical WSO is a routine operation that is commonly carried out and is part of standard well work; meanwhile, the chemical WSO is a specific treatment. The study aims to identify the effect of polymer concentration, injection rate, and soaking time on the effectiveness of chemical WSO with cross-linked polymers in a specific field. The study proposes and analyses the optimization of this treatment in the 7E Sandstone field by utilizing a conceptual simulation model. Geographically, this field is located in the Central Sumatera basin. The field is a moderately homogenous sandstone. Last decade, the 7E field was associated with excessive water production issue, some mechanical WSO has been done to solve the problem, but less effective and inefficient. Hence chemical WSO job comes as a promising option to overcome this problem robustly. The cross-link polymer injection treatment is the action of blocking water from entering and reaching production wells by using a mixture of polymer, cross-linker, and water. A base case of the conceptual model has been developed, then over twenty injection scenarios wide-ranging based on polymer concentrations are implemented in the model. Each of these concentration schemes is simulated using different injection flow rates for the total injection volume of 2000 bbl. The injection rate sets at 1000 bbl/day for twice injection and 2000 bbl/day for one injection. Soaking time is settled for one, two, and three days to give time for generating gelatin. A comparison of water production before and after the WSO is used to investigate WSO effectivity. The simulation result mentions that the WSO implementation can decrease excess water from 385,143 bbl to 186,189 bbl.
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