Technical Session - 2

Title:            Failure mechanism and parameters impact on sanding in the Early Miocene reservoirs at Dai Hung field, Vietnam
Authors:       Nguyen Anh Tu, Do Quang Khanh
Abstract:     Sanding is one of the most serious problems in completion and production for petroleum wells in unconsolidated and weakly consolidated rocks. Sand production can cause wellbore instability, reduced production, damaged equipment, eroded casing and surface facilities, and in extreme cases, loss of wells may also occur. The determination and identification of sand failure mechanism and parameters influencing on sanding is actually necessary and important to predict accurately sanding and rates. This study aims to determine sand failure mechanism and evaluate key parameters impact on sanding at Dai Hung field, Vietnam. Until now, the predicting models of sand production at Dai Hung field still have not been established and evaluated. Therefore, it is very hard to monitor and control the sand production during the exploitation of petroleum wells at Dai Hung field. Field observation technique was used to study sanding at Dai Hung field. Studied data are taken from the completion and production history of petroleum wells that have been produced in the Early Miocene reservoirs. Results obtained from petroleum wells in the Early Miocene reservoirs at Dai Hung field showed that the impairment of cohesive stress is the major sand failure mechanism. Furthermore, the sand production of petroleum wells in the Early Miocene reservoirs is also depended mainly on parameters such as water cut, gas oil ratio, bean size, etc. These parameters affect sanding at Dai Hung field either separately or simultaneously. By their monitoring and controlling, the production conditions of petroleum wells may predict and prevent more accurately sanding, as well as mitigate and control more effectively the sanding problems at the Early Miocene reservoirs in Dai Hung field, Vietnam.

Keywords:  Sanding, failure mechanism, cohesive stress, production, Dai Hung
Pages:        128-132

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